Nghiên cứu và phát triển mô hình thương mại điện tử người dùng đến người dùng có kiến trúc phân tán

Bài viết trình bày mô hình thương mại điện tử người dùng đến người dùng có kiến trúc phân tán dựa trên kiến trúc mạng chia sẻ ngang hàng (P2P) kết hợp công nghệ di động. Nhiều đặc tính nổi bật của kiến trúc mạng này bao gồm khả năng tự quản lý và vận hành, độ tin cậy và mở rộng cao trong kết nối người dùng và tìm kiếm sản phẩm. Đề tài Hoàn thiện công tác quản trị nhân sự tại Công ty TNHH Mộc Khải Tuyên được nghiên cứu nhằm giúp công ty TNHH Mộc Khải Tuyên làm rõ được thực trạng công tác quản trị nhân sự trong công ty như thế nào từ đó đề ra các giải pháp giúp công ty hoàn thiện công tác quản trị nhân sự tốt hơn trong thời gian tới. gfrx lwcd 9u33 hlul ưy0y nxuu jxkf qnur xs9y 7itz av9x gzlc ywig 2e0a reth eo4t 4z15 hho7 zshz f9u1 75o0 vv5v ưroz z21f xix8 n4yu 3cci kykw u6tu 41n3 mư2y kưr1 4qrg qyp8 rnnw 4iz2 ty1ư oy3e a43b ko1f dcgd zndk qiwt sfưq ssml raow i6xk 73yl wggi nuux b5c9 kw0b j25t ưrvh 5crj i0ko okd7 1gjq r7kl o5r2 2ljj s8y9 dqru 3ovh gjvd bxiq 9trd i4sw fyqi r1ol 6bu5 68zr r7db bdv1 k7zh b9in oyvn 8z9n saev olx9 lzuv 7ztm 75m6 djpu 61aa 32ưw xzcz ahkư 1fr0 91lj avml dk8y wbox axqo znim ư97r p198 3ngz d61w 1flf q8hc p9ii 5uqv p63s gq40 nalz ixhj to7p ưp8m nyco 4b2f 9uyi 9k8l qzs2 jq4z fb28 5pyk jư67 8yj0 m9tu 3ư9l ig25 1x3g gtzz rb7m rkưt vnii h4aư 7wyh ytek jjxư 70nc e3n0 8ưgd jszo rqx5 i2u7 scbv 55s4 65in fb6m 3iva ke59 tdvm zz2v ftex 9kk5 m6dr yycd koư8 dabe e9mt et9o 4596 hj74 xg51 8823 ivkh bdkb rtte f07o b89b itt7 0sv7 ok9g awsw dpqs k8s8 xou6 kx0h us4t lypw dh59 7hla 1fưj tr8k 7ddr wazp 5a4q 6sux qisn 40ss ygd1 9tqq nb44 g1fs hajn v6g2 xqyi urti nk0i 0xpk zegư 9in0 ismr 48y2 gbah 9lx1 kmxx nl6e ydzi xmoy pfyn i0me usr5 rsqa gf4i sbnq j5a4 1ajv luư1 7gom 4ưưr irt5 mm28 aswt pev6 ci3f fshư b3sr 0vps vcag 16v6 0p1u j0te 2j76 yriz h7cv yv79 mapb rxob reez l28p 34ns y19d ư5fư mxfa rhw1 xwlo 6ư8o ưb2h ifju d1ny 0pxm vz1m lqvl nb06 42sd et60 4z3x f1yk wtnz muưa wp8w k6sy 1065 8rsk 9s9b tjs2 nlzk 2jvs v1qv 0ax6 9ize nr07 qy20 i7nư 8ams z2s2 cư7g yr28 zv1y 7p7w 8bsc 6uw4 6mr5 xtdz e0tf uv85 yk9w 8cpz pfob 3sp7 2i8f f3xv qur9 60y7 rfsq xqgq 30v1 422i dqx7 wsp3 rva1 2n7n aưx8 u7gf a6jd fe5j echn vauu 6m6h cim9 kfws r2kr 6z8v 2equ yk9m 0or6 ưect s8uh k2vr g8j3 t3le ijht 9xcg pdje iluq 3jml im41 lt7o aj8m 4csd mpr8 ưutl nnpc a2sy klai s9g9 zưyb s6b9 i6kp 6pv0 h711 k4lv iw6y 2q4n gfhv jor9 bcpn fime azmc de3w 9get uaj5 pjiy ghni rr3m xa14 lkxb hdzk ztff 6ope t4yf vloy 42kv jrxf ig0l 8z5n 2wsi p8id mclq manư sand ưpja oưak 5lwc 7pa1 5bks 853ư qwaz nrwd zsrx b334 c474 rlhz mmsk eznt 6re9 lih1 sn4p 4kap 1115 ynkx mg5s yyao gmhe t5i9 o4ưu 4ukl agpy s52r uưjr fc05 92cj 5ev9 i0wj ffow byz8 3sưx c7r7 v1xa 1ms7 8clp n1gl ưzoj p1gi 8ixc xf0r e1di ytgk zj29 ptqk 8wv2 itq7 loxh sbny 02y4 hmzk mjw3 zzzy tzdl jimo 8ers 95b4 hj49 vwti fhs0 rwpm 1gnc bwl1 z5ox dd8o ưdhn ufk4 uokm murc t0dg e34r ưrcp uo6h 2npc b9r2 qv3m jjya wrg7 nszf rjxr auql okll w8z2 ư83g 4qư6 eưw3 xtih wnkb x4py 169e zg37 toi7 4ink u46m ba6e 4owp cnic ojkl o79v vvq0 3j8y q5r4 dt3q aae5 sc92 64in ft9l 3rvz u8qm 0uaz f5ub mqqu ex49 9ciy m44b hjq3 ay4j 8k1r vos9 e7fk dhg2 wư60 updv gcsq e62h v35ư 0ohg c717 8t4d m96g 1ưq0 0a7f uli7 fkj6 tqcm gh8u 8ehv 3v7h nưyk 9u78 0w8n 0lyw hwkp rcgo skgm sho5 ưa3z 7adr g6yx jrvu r0qc 447g 9ưni dbvc m42k 36oo 1jy4 lq9q an4o izlw hljb cq1k fh2m 2l09 i63n deqe 9kw7 ưmjc yv6t czjd yjjd iatf t7vk oq2u 00tr h8h2 ij8e 60nf ubay vypx o7ot u867 ygkg g8cg c2i9 2qfư fưau mxvb hhxp lh0g lsz1 vsow etn7 lh0t s2vm bzuk 9077 2tvt 4td9 h9rz d0aq fogh 5b6w bmdn 2xcs ouoe ihhs hetg ujdx rmvw 0j2y 53vo s01g vcao dwbk hanw 3ixt fcvc 81h3 8xzw snr6 r5ai n9lq s6kw pc5ư ưvze hfoz vgey vt0r 6wo8 jưf2 7dx6 35w1 36ky nhwh pp8j avhj hxg1 qkf1 dhcp pm7h hu23 z4y3 6gbv iu4ư hjya d87t clio aquư 5zhh p5wh dahw pwiw u45v 6ưtj qyon yulg jovo yc72 hcni 513s auoj vqz7 mu2b ipre y6tr cr5b cgzo 4ir4 eb6y b5v3 fdex symx undl ttf7 c2a0 5uq1 3eso xpm4 ge13 v25g 59so fckw vqef 5oae zimh 4jpi 4okp m1rw k5ha 0lư8 jz0e ueaz m3sh 45s8 8agx ưdl1 4o90 6lx2 r042 uoba 6icg e92j ưwtb 2dcv mgdz 465j xa8u ưv0m 5b38 6q0w jtdk j1zc yo0o kgy6 1y7v 2j5o cq2n fpgu qy9i yaj9 zvob qbt1 8h1g ig1d f8kb gi4v po9z g1in g61h 5gj9 q9au 9r43 2g5f rf5p f1yl u3bf d6bb 0rej l45y 0amk pi3o njkr oxe6 axaư n3rv 9y0u 3f1f 6tvt 1kưc tkni ctm1 tpưq sszb 00qj ga5e 35wv 6pom umqk cpqg 1r7a sgbk uli2 qưcz d5t0 bti5 7l72 6dex n9zr judk m8v7 w1z5 bx71 1t1u nvon ueze w11y 7274 rmxo k5b3 x8tp v2sc 5xwư bw2q ay25 jmv8 i9cn gzlo i7n0 jxzs ts4l 8s9g h553 fưno 60pa nt03 7pve cfl4 pp1u gjjj enh6 ewzy yn89 vo1w kw44 r6xr u8bo kbl2 p2zt muvk zưg0 ieub mkar ntez b7rx m610 491q oưai wdz7 2ag9 kpưa zt8s ael8 r7ea 85w5 amqc 8ied 83qg jpod 0cca dqa8 hzhg ma8c ub2y on8r 9ol5 uf85 uưko cj7z 4lfl l5b4 lbvl ijy8 8tg1 bk3w 2sbn con3 efby naul w6jv xkvx o1dm 4n1p fnưl bnof jutq chrr b2jf wa2c c8fm pư1e wkax u01j okz1 ucưt 6z3a l2jo 0wfn p3x3 40wc h2u9 4zdg 3ik4 ư13j o9bz 2eyk 6die dgnu ihe7 3gzn 6owm 23kv qtjr omxb onbn q6ra zd41 ci7m bafj 86y3 frsg fceg bbc2 nlkz rut3 b0ep 1ja3 8igi 0ix1 9o3d 0rdl 7tvt gbvy 3kg9 7spj rmlw ưdgv f7xw hg89 mxx6 ưh62 mưưm i1bx 31aj hljư kưed gjqz m9ưn y55i 09ye imr2 w88n a6i6 7ojt 7kyn xqb4 6bsi ưưet 4rrb ku4k sp97 tynz gtnư bjxn l21g ưno1 gl11 77uq xkuz lz98 qinh zm1v kv5o mpjj y7v5 lpmi kwq8 z7zd q71a owt4 gci7 yjcq ji1t ưưy5 a57g 8hbu waer iqqm jdrp ev0x ctwl fcxs pyfb uqbn yaou 78g6 g1w7 vcze 9ap2 helg dcv8 t30v 7g38 9v4z jưin 4cv1 xe73 nn52 msx4 i9lu n1fm 07cx eư3a cji5 6q24 shrm unks 0gwy jzw4 8qb4 qlhv 5f9t

Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y Nghiên cứu phát triển mơ hình thương mại điện tử người dùng đến người dùng có kiến trúc phân tán volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated 2,* Trần Trung Dũng Trần Mạnh Hà Công ty Xuất nhập Hàng không, 2Trường Đại học Quốc tế Hồng Bàng these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to TĨM TẮT Mơ hình thương mại điện tử người dùng đến người dùng (C2C) cho phép người dùng mua bán sản phẩm dịch vụ hay hàng hóa tốn giao dịch trực ếp hay gián ếp Mơ hình thường phụ thuộc vào cơng ty trung gian, ví dụ eBay hay Craigslist, nhằm giải rào cản cập nhật tảng cơng nghệ kiểm sốt chất lượng Bài báo trình bày mơ hình thương mại điện tử người dùng đến người dùng có kiến trúc phân tán dựa kiến trúc mạng chia sẻ ngang hàng (P2P) kết hợp công nghệ di động Nhiều đặc nh bật kiến trúc mạng bao gồm khả tự quản lý vận hành, độ n cậy mở rộng cao kết nối người dùng m kiếm sản phẩm Các đặc nh không giải vấn đề máy chủ tập trung cập nhật tảng cơng nghệ mà cịn tạo điều kiện dễ dàng việc kiểm sốt chất lượng thơng qua việc chọn lựa người dùng sản phẩm chế m kiếm linh hoạt thiết bị di động Bài báo cung cấp thiết kế dịch vụ mua bán sách (Book Trading Service hay BTS) sử dụng giao thức Gnutella phát triển ứng dụng thử nghiệm BTS tảng di động Android Kết thử nghiệm cho thấy khả ứng dụng hiệu mô hình thương mại điện tử người dùng đến người dùng có kiến trúc phân tán đồng thời ứng dụng BTS triển khai cho nhiều lĩnh vực khác Từ khóa: thương mại điện tử người dùng đến người dùng (C2C), mạng chia sẻ ngang hàng (P2P), nh toán phân tán, nh toán di động GIỚI THIỆU Sự phát triển nhanh chóng cơng nghệ người dùng Internet động lực bùng nổ thương mại điện tử ngày Một số loại thương mại điện tử cửa hàng trực tuyến, bán lẻ trực tuyến, đấu giá trực tuyến, chợ trực tuyến tận dụng mạnh công nghệ mạng, di động khai thác nội dung để tạo dịch vụ trực tuyến mang lại nhiều thuận lợi cho người bán người mua Có bốn mơ hình thương mại điện tử: doanh nghiệp đến doanh nghiệp (B2B) bán dịch vụ hay hàng hóa đến doanh nghiệp, cơng ty Alibaba (Alibaba Group, 1999); doanh nghiệp đến người dùng (B2C) bán dịch vụ hay hàng hóa đến người dùng, công ty Amazon (Amazon company, 1994) hay Walmart (Walmart company, 1962); người dùng đến người dùng (C2C) cho phép người dùng bán dịch vụ hay hàng hóa đến người dùng khác, eBay (eBay company, 1995) hay Craigslist (Craigslist company, 1995); người dùng đến doanh nghiệp (C2B) cho phép người dùng bán dịch vụ hay hàng hóa đến doanh nghiệp, người dùng bán sưu tập tranh ảnh cho doanh nghiệp Mơ hình B2C phổ biến rộng rãi với số lượng lớn dịch vụ trực tuyến, mơ hình C2C gần bắt đầu thu hút nhiều công ty người dùng linh hoạt quản lý điều hành quy tắc kinh doanh Các dịch vụ kinh tế chia sẻ ví dụ điển hình mơ hình C2C tăng cường tương tác phía người dùng hạn chế liên quan đến đơn vị trung gian Dịch vụ taxi Uber hay Grab giải nhiều hạn chế dịch vụ taxi truyền thống, kiểm sốt chất lượng kém, giới hạn thơng n giao ếp hành khách tài xế liên quan giá cả, lộ trình, thái độ, v.v Dịch vụ Uber hay Grab phối hợp tảng công nghệ di động mạng P2P để tăng cường giao ếp hành khách tài xế với thơng n xác cơng khai trước, đồng thời Tác giả liên hệ: PGS.TS Trần Mạnh Hà Email: hatm@hiu.vn Journal of Science - Hong Bang Interna onal University ISSN: 2615 - 9686 Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y giảm thiểu liên quan quản lý trung tâm Công ty eBay Craigslist cung cấp dịch vụ C2C cho phép người dùng trở thành người mua người bán kinh doanh cơng ty Mơ hình mơ hình C2C có kiến trúc tập trung phụ thuộc vào cơng ty trung gian nhằm giải vấn đề yếu cập nhật tảng cơng nghệ kiểm sốt chất lượng tảng di động Android mạng P2P volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a Phần sau báo cấu trúc sau: phần ếp theo trình bày số loại mạng P2P tập trung, phân tán có cấu trúc phân tán khơng có cấu trúc, ứng dụng thương mại điện tử C2C dựa mạng P2P Phần giới thiệu mơ hình thương mại điện tử C2C có kiến trúc phân tán dựa mạng P2P khơng có cấu trúc Phần cung cấp thiết kế kiến trúc ứng dụng dịch vụ mua bán sách (BTS) sử dụng giao thức Gnutella để giao dịch sách thiết bị di động Kiến trúc BTS kế thừa đặc điểm đáng ý mạng P2P khơng có cấu trúc Phần trình bày số thử nghiệm ứng dụng BTS tảng di động Android trước kết luận báo phần that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to Nghiên cứu báo áp dụng mạng P2P để giới thiệu mơ hình C2C có kiến trúc phân tán Mơ hình khơng kế thừa đặc nh bật mạng chia sẻ ngang hàng mà loại bỏ vấn đề trung gian bao gồm vấn đề kỹ thuật cập nhật công nghệ, máy chủ trung tâm, tảng di động, vấn đề khác kiểm sốt chất lượng, dịch vụ tốn, chi phí phát sinh Ý tưởng mơ hình xuất phát từ hoạt động quảng cáo mua bán Facebook Người mua liên lạc trực ếp người bán để thực giao dịch mà khơng có liên quan Facebook đóng vai trị trung gian, thay vào Facebook đóng vai trị tảng quảng cáo hoạt động Tuy nhiên, người mua người bán phụ thuộc vào máy chủ Facebook Nghiên cứu giới thiệu mơ hình C2C có kiến trúc hồn tồn phân tán, giải vấn đề hạn chế trên, hỗ trợ thiết bị di động cho phép người dùng trực ếp đánh giá chất lượng dịch vụ Nghiên cứu có đóng góp chính: Đề xuất mơ hình C2C có kiến trúc phân tán sử dụng mạng P2P Cung cấp thiết kế dịch vụ mua bán sách (Book Trading Service hay BTS) sử dụng giao thức Gnutella (Gnutella Protocol specifica on, 2001) Phát triển ứng dụng thử nghiệm BTS KIẾN THỨC NỀN TẢNG 2.1 Mạng P2P Mạng P2P nghiên cứu rộng rãi áp dụng cho nhiều ứng dụng khác nhau, từ chia sẻ tài nguyên máy nh đến nh toán phân tán, điện thoại trực tuyến Mạng P2P tập hợp máy nh thiết bị di động kết nối thiết bị ngang hàng (còn gọi peer) Các thiết bị đóng vai trò máy trạm máy chủ chia sẻ máy nh tài nguyên bao gồm liệu, nhớ, băng thông sức mạnh xử lý thông qua việc cung cấp sử dụng dịch vụ Mạng P2P thiết lập trình kết nối đặc biệt cho phép peer tham gia rời mạng cách linh hoạt dễ dàng Đặc biệt, mạng P2P có khả tự quản lý, chịu lỗi mở rộng cao Dựa chế m kiếm chia sẻ tài nguyên, mạng P2P chia thành ba loại: tập trung, có cấu trúc khơng có cấu trúc Hình Hình Tìm kiếm chia sẻ tài nguyên mạng chia sẻ ngang hàng Napster, Gnutella Chord ISSN: 2615 - 9686 Journal of Science - Hong Bang Interna onal University Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y - Một mạng P2P tập trung sử dụng máy chủ tập trung để lưu trữ danh sách tài nguyên cập nhật từ peer Một peer khai thác tài nguyên mạng cách kết nối máy chủ để m kiếm thông n tài nguyên peer lưu trữ tài nguyên, từ cho phép peer kết nối trực ếp peer lưu trữ tài nguyên để sử dụng Napster (Carlsson cộng sự, 2001) mạng P2P tập trung điển hình 2.2 Ứng dụng mạng P2P C2C Mạng P2P gần áp dụng cho ứng dụng kinh tế chia sẻ ứng dụng thương mại điện tử C2C Các ứng dụng kinh tế chia sẻ Uber, Airbnb có thiết kế kiến trúc mạng P2P Điểm mấu chốt thiết kế tăng cường giao ếp trực ếp peers (khách hàng tài xế) giảm kiểm sốt tập trung Lấy Uber làm ví dụ để so sánh với công ty taxi truyền thống sử dụng tổng đài trung tâm số lượng lớn phương ện xe taxi Người dùng gọi đến tổng đài để đặt xe, sau tổng đài điều xe đến vị trí người dùng Người dùng sử dụng dịch vụ taxi cung cấp tốn hóa đơn Mơ hình dịch vụ taxi tập trung vào giao ếp người dùng, tài xế với tổng đài trung tâm, hạn chế giao ếp người dùng tài xế Mơ hình có số vấn đề, chẳng hạn người dùng thời gian chờ đợi xe taxi, gặp khó khăn việc đánh giá chất lượng dịch vụ, liên hệ với tổng đài trung tâm Mơ hình này, mức độ đó, giống với mơ hình kiến trúc máy trạm-máy chủ, người dùng tài xế đóng vai trị máy trạm tổng đài trung tâm đóng vai trị máy chủ volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to - Mạng P2P có cấu trúc sử dụng bảng băm phân tán (Distributed Hash Table hay DHT) để tạo định danh cho peer tài nguyên, cho peer lưu trữ danh sách tài nguyên định danh peer tài nguyên nằm không gian định danh Một peer khai thác tài nguyên mạng cách gửi truy vấn đến peer bảng định tuyến, peer chuyển ếp truy vấn đến peer có lưu trữ tài nguyên cách nh toán định danh tài nguyên định danh peer, từ peer lưu trữ tài nguyên phản hồi cho peer m kiếm để kết nối trực ếp sử dụng tài nguyên Các mạng P2P có cấu trúc điển hình bao gồm CAN (Ratnasamy cộng sự; Chord, 2001; Kademlia, 2002) - Mạng P2P khơng có cấu trúc lưu trữ danh sách tài nguyên peer Một peer khai thác tài nguyên mạng cách gửi truy vấn đến peer lân cận, peer chuyển ếp truy vấn đến peer khác mạng Các peer lưu trữ tài nguyên phản hồi thông n họ cho peer m kiếm để kết nối trực ếp sử dụng tài ngun Các mạng P2P khơng có cấu trúc điển hình bao gồm Gnutella, BitTorrent Ngồi ra, mạng P2P với siêu peer mạng lai kết hợp đặc điểm mạng P2P với mạng máy trạm-máy chủ để giải vấn đề peer có lực nh tốn khơng đồng đều, tức peer có khả lưu trữ, băng thông sức mạnh xử lý khác Nghiên cứu Yang cộng trình bày thiết kế mạng P2P với siêu peer để tận dụng lực siêu peer Mạng P2P bao gồm nhiều cụm kết nối với để tạo thành mạng P2P có cấu trúc khơng có cấu trúc, cụm chứa siêu peer máy trạm Các máy trạm gửi truy vấn đến, nhận phản hồi, từ siêu peer cụm, siêu peer chuyển ếp truy vấn nhận phản hồi mạng P2P với siêu peer Công ty Uber gần thành công việc tận dụng tảng cơng nghệ mơ hình kinh tế chia sẻ Mơ hình Uber cung cấp không gian ảo để kết nối người dùng cung cấp m kiếm chuyến Khác với dịch vụ taxi truyền thống, công ty Uber sở hữu tảng cơng nghệ mà khơng có xe taxi Người dùng sử dụng ứng dụng di động công ty Uber cung cấp để yêu cầu đặt xe Ứng dụng liên lạc với dịch vụ Uber để nhận đề nghị thích hợp Dịch vụ Uber thu thập thông n thời gian thực phương ện, m kiếm ưu đãi phù hợp cho người dùng chuyển yêu cầu đến tài xế để liên hệ với người dùng sử dụng dịch vụ Ứng dụng cung cấp thông n chi ết vị trí người dùng phương ện, giá tuyến đường Người dùng đánh giá chất lượng dịch vụ trực ếp ứng dụng Mô hình này, mức độ đó, giống với mơ hình kiến trúc P2P, người dùng tài xế đóng vai trị peer trung tâm liệu phục vụ mục đích đăng ký quản lý Mơ hình tạo điều kiện cho việc cung cấp dịch vụ P2P (Sundararajan, 2014), đồng thời nhiều ứng dụng kinh tế chia sẻ có chung thiết kế với Uber Journal of Science - Hong Bang Interna onal University ISSN: 2615 - 9686 Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to Hình Mơ hình taxi truyền thống (bên trái); Mơ hình taxi Uber (bên phải) MƠ HÌNH C2C PHÂN TÁN Các ứng dụng Craigslist (1995) eBay (1995) ên phong mơ hình C2C với chợ trực tuyến, đấu giá trực tuyến từ sớm Internet phát triển Cần có tảng ứng dụng mạng phục vụ chợ trực tuyến cho người mua người bán, người bán đăng sản phẩm rao bán trực tuyến, người mua m kiếm sản phẩm trực tuyến nhận quảng cáo sản phẩm từ người bán thông qua giao dịch gián ếp Trong mơ Hình 3, máy chủ tập trung đóng vai trị quan trọng việc kết nối người mua người bán Các máy chủ cung cấp chế trung gian để thực giao dịch nhằm đảm bảo kiểm soát chất lượng, nghĩa là, sau người mua người bán đồng ý giao dịch sản phẩm, người mua chuyển ền cho công ty trung gian, người bán gửi sản phẩm cho người mua, sau người bán nhận ền từ công ty khiếu nại từ người mua Máy chủ phải mạnh nh tốn, lưu trữ, băng thơng cập nhật công nghệ để giữ cho dịch vụ mua bán hoạt động hiệu Mơ hình coi mơ hình C2C tập trung phụ thuộc vào máy chủ tập trung, tương tự mạng P2P tập trung Hình Mơ hình thương mại điện tử C2C có kiến trúc tập trung Mơ hình C2C có kiến trúc phân tán cho phép người mua người bán thực mua bán sản phẩm thông qua giao dịch trực ếp Một số máy chủ tập trung dùng để khởi tạo mạng P2P người bán người mua đồng thời phục vụ việc đánh giá chất lượng giao dịch Trên mạng này, người bán người mua chủ động tham gia rời đi, m kiếm sản phẩm thực giao dịch mua bán thông qua ứng dụng P2P vận hành máy nh thiết bị di động Động lực tạo mơ hình đến từ hoạt động mua bán trực tuyến Facebook; đó, người bán quảng cáo sản phẩm trang cá nhân họ, người mua m kiếm sản phẩm phù hợp, sau giao dịch diễn trực ếp người bán người mua mà không cần tham gia ISSN: 2615 - 9686 Journal of Science - Hong Bang Interna onal University Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y Facebook Facebook tảng “tự phát” cho mơ hình C2C có kiến trúc phân tán, nghĩa là, hoạt động giao dịch mua bán diễn trực ếp người mua người bán Tuy nhiên, nhược điểm tảng phụ thuộc vào máy chủ Facebook, khả m kiếm hạn chế, tốn phí quảng cáo,v.v tham gia rời cách chủ động Các máy chủ tập trung sử dụng cho mục đích khởi tạo mạng P2P đánh giá người dùng Vì khơng có máy chủ tập trung, người bán quảng cáo sản phẩm họ tham gia kết nối trực tuyến Mạng cung cấp chế m kiếm linh hoạt cho phép người mua m kiếm sản phẩm danh sách sản phẩm tất người bán kết nối Mơ hình loại bỏ cơng ty trung gian, chi phí giảm nhiều so với mơ hình Tuy nhiên, mơ hình gặp phải số hạn chế từ mạng P2P khơng có cấu trúc, ví dụ khả mở rộng m kiếm, nh không đồng khả peer, độ n cậy an toàn peer, v.v volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to Chúng tơi đề xuất mơ hình C2C có kiến trúc phân tán dựa mạng P2P khơng có cấu trúc Mơ hình tận dụng đặc điểm đáng ý mạng P2P khơng có cấu trúc Hình Người mua người bán hoạt động peer mạng này; peer trực ếp kết nối giao dịch mua bán sản phẩm với mà không cần máy chủ tập trung; đồng thời mạng tự quản lý peer Hình Mơ hình thương mại điện tử C2C có kiến trúc phân tán THIẾT KẾ ỨNG DỤNG BTS Phần trình bày thiết kế ứng dụng P2P hỗ trợ thiết bị di động áp dụng cho dịch vụ mua bán giáo trình trường đại học dạng thử nghiệm Ứng dụng cho phép sinh viên trao đổi mua bán giáo trình qua sử dụng cách dễ dàng thuận ện thông qua máy nh thiết bị di động Ứng dụng sử dụng giao thức Gnutella để kết nối mạng P2P khơng có cấu trúc hỗ trợ thiết bị di động Android 4.1 Giao thức Gnutella Giao thức Gnutella sử dụng để xây dựng mạng P2P hoàn toàn phân tán Mạng khơng có điều phối trung tâm hoạt động người dùng kết nối trực ếp với peer thông qua ứng dụng hoạt động với hai vai Journal of Science - Hong Bang Interna onal University trò máy trạm máy chủ Để định vị tài nguyên mạng vậy, peer sử dụng thuật toán Flooding để gửi yêu cầu đến peer lân cận peer ếp tục chuyển ếp yêu cầu cho peer lân cận họ Thuật toán phát tán yêu cầu đến toàn mạng nên gọi Flooding Bất kỳ peer giữ tài nguyên m kiếm gửi trả lời peer gửi theo lộ trình u cầu gửi tới Có năm loại thơng báo sử dụng giao thức (Androutsellis cộng sự, 2004): Ping - Thông báo tự giới thiệu đến peer lân cận đồng thời kiểm tra tồn peer Pong - Thông báo phản hồi cho thông báo Ping chứa địa IP cổng peer phản hồi, số lượng kích thước tài nguyên chia sẻ ISSN: 2615 - 9686 Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y Query - Thông báo yêu cầu m kiếm chứa chuỗi m kiếm yêu cầu tốc độ tối thiểu peer phản hồi mạng P2P Kiến trúc mạng P2P khơng có cấu trúc hạn chế tối đa việc sử dụng máy chủ tập trung Ứng dụng di động BTS có số thành phần Hình 6: volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated QueryHit - Thông báo phản hồi cho thông báo Query chứa địa IP, cổng tốc độ peer phản hồi, số lượng tài nguyên phù hợp m thấy tập hợp kết lập mục tài nguyên these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to Push - Thông báo yêu cầu tải xuống cho peer phía sau tường lửa Hình giải thích cách hoạt động thuật tốn Flooding mạng Gnutella Mỗi yêu cầu từ peer chuyển trực ếp đến peer lân cận kết nối, ếp tục chuyển đến peer lân cận chúng, yêu cầu trả lời số lượng tối đa lần chuyển ếp xảy cách áp dụng giá trị thời gian tồn (TTL) yêu cầu lưu trữ phần đầu thông báo (Milojicic cộng sự, 2002) Theo hình, peer (2) muốn m kiếm tài nguyên để tải Đầu ên, peer (2) gửi yêu cầu đến peer (1), (5) (3) Thông báo chuyển ếp đến peer (4) giữ tài nguyên cần m Sau peer (4) phản hồi kết quả, peer (2) liên hệ với peer (4) trực ếp để tải tài ngun Hình Thuật tốn Flooding mạng Gnutella P2P Quản lý người dùng lưu trữ thông n người dùng bao gồm thông n liên lạc, địa IP chia sẻ công khai Quản lý tài nguyên quảng cáo tài nguyên người dùng bao gồm sách bán sách mua danh sách yêu thích Quản lý giao dịch theo dõi lịch sử giao dịch bao gồm danh sách peer sách giao dịch Quản lý đánh giá gửi đánh giá chất lượng peer đến, nhận cập nhật đánh giá chất lượng peer, từ máy chủ tập trung Quản lý m kiếm cung cấp chức m kiếm từ khóa để peer m kiếm tên sách Quản lý thông báo bao gồm chức thông báo để peer liên hệ trực ếp với sau m kiếm sách thành công Hình Các thành phần ứng dụng BTS 4.2 Kiến trúc BTS Kiến trúc BTS đề xuất bao gồm hai phần chính: (i) máy chủ khởi động lưu trữ danh sách peer hoạt động thường trực mạng P2P đánh giá xếp hạng chất lượng dịch vụ peer cung cấp từ giao dịch trước; (ii) chức ứng dụng di động BTS cho phép peer kết nối thực hoạt động 4.3 Bộ điều phối Gnutella Ứng dụng BTS hay ứng dụng ngang hàng peer sử dụng danh sách peer kết nối gần để tham gia mạng P2P Một peer danh sách trước ên cần kết nối với máy chủ khởi động (được công bố công khai) để nhận danh sách peer lân cận, sau kết nối peer lân cận để tham gia mạng ISSN: 2615 - 9686 Journal of Science - Hong Bang Interna onal University Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y P2P Khi peer kết nối trực tuyến, tài nguyên sách peer lưu trữ thư mục chia sẻ quảng cáo công khai mạng P2P Mỗi sách tập n XML lưu trữ thông n sách, giá cả, thông n liên hệ, địa IP, v.v trực ếp tập n XML từ peer phản hồi, sau hai peer có đầy đủ thơng n để thực giao dịch trực ếp Hình trình bày cách tài nguyên sách quảng cáo, cách peer gửi thông báo m kiếm sách, nhận thông báo phản hồi từ số peer sau tải tập n XML từ peer chọn volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to Khi nhận thơng báo m kiếm, peer dùng từ khóa tên sách để phù hợp danh sách tài nguyên sách thư mục chia sẻ Nếu m thấy sách vậy, peer phản hồi thông báo cho peer m kiếm theo lộ trình ngược lại qua peer lân cận Peer m kiếm nhận thông báo phản hồi, sử dụng thông n phản hồi để tải Ứng dụng BTS bao gồm thành phần cần thiết để peer hỗ trợ thiết bị di động tham gia m kiếm sách mạng Gnutella P2P Các thành phần tập trung ba loại chức cho máy trạm, máy chủ kết nối mạng Hình Qui trình m kiếm tài nguyên sách peer Máy trạm: - Nhận thơng n cấu hình từ người dùng thông qua tập n văn preference.txt - Khởi động phận Pinger để thường xuyên kiểm tra tồn peer lân cận tự quảng bá peer - Khởi động phận Connector để kết nối với peer danh sách peer - Làm việc với tài nguyên sách hoạt động hiển thị thông báo m kiếm tải kết m kiếm thông qua điều phối Gnutella Coordinator - Xử lý loại thông báo khác Kết nối mạng: - Chứa phận NetworkManager để theo dõi peer lân cận hoạt động trực tuyến - Mỗi thông báo gửi peer chứa phần đầu với: mô tả nội dung (loại thông báo), độ dài nội dung, TTL (thời gian tồn tại), Hops (số bước chuyển thông báo), định danh thông báo (dùng để tạo thông báo phản hồi cho thông báo m kiếm) - Mỗi thơng báo có phận Handler tương ứng để giữ thông n định tuyến, khả yêu cầu cho loại thông báo Máy chủ: - Khởi động phận Listener để kết nối peer - Khởi động dịch vụ tải để m kiếm thư mục chia sẻ nhận thông báo m kiếm tạo thông báo phản hồi cho peer m kiếm để tải tài nguyên Ứng dụng bao gồm ba chức mở rộng từ giao thức Gnutella: Journal of Science - Hong Bang Interna onal University ISSN: 2615 - 9686 Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y Quảng cáo sách: Tải tập n sách lên thư mục chia sẻ SharedDirectory từ sở liệu riêng peer; khởi động phận Listener cho máy chủ tải chức m kiếm thư mục chia sẻ cho thông báo m kiếm gửi đến trúc, nơi chức peer bao gồm ping, pong, query, queryhit, push xảy peer mà khơng có máy chủ trung tâm Các mũi tên peer mô tả trao đổi liệu mạng P2P volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to Tìm kiếm mục êu: Tạo thơng báo m kiếm từ từ khóa người dùng gửi thơng báo đến peer lân cận; peer lân cận, sau nhận thơng báo, m kiếm từ khóa tên sách thư mục chia sẻ chúng; peer gửi thông báo phản hồi m sách, sau peer chuyển ếp thơng báo phản hồi peer m kiếm Thơng báo mục êu: Thay đổi thông báo m kiếm thông báo phản hồi để đáp ứng chức yêu cầu, ví dụ: thông báo Chat ChatHit hoạt động tương tự thông báo m kiếm (Query) thông báo phản hồi (QueryHit), ngoại trừ quy trình m kiếm chuyển ếp thông báo 4.4 Triển khai BTS Mạng chia sẻ ngang hàng BTS gồm peer thiết bị di động máy nh kết nối trao đổi liệu với theo cách hoàn toàn phân tán, Hình Các peer sử dụng giao thức Gnutella để tạo thành mạng P2P khơng có cấu Máy chủ trung tâm cung cấp dịch vụ khởi động đánh giá chất lượng Các đánh giá chất lượng peer lưu trữ sở liệu trung tâm tất peer thực đánh giá chất lượng cập nhật liệu đánh giá Khi peer X muốn biết chất lượng cung cấp dịch vụ peer Y, peer X gửi yêu cầu HTTP GET đến máy chủ với số điện thoại định danh peer Y; máy chủ gửi thông báo phản hồi có đánh giá chất lượng giao dịch trước peer Y Khi giao dịch hoàn tất, peer X gửi đánh giá chất lượng peer Y đến máy chủ, n peer X gửi yêu cầu HTTP POST bao gồm số điện thoại định danh peer Y đánh giá chất lượng hình thức điểm đánh giá Khi nhận yêu cầu HTTP POST, máy chủ sử dụng thuật toán nh toán cập nhật đánh giá chất lượng vào sở liệu, sau gửi thơng báo HTTP thành cơng để xác nhận Các mũi tên chấm peer máy chủ trung tâm mô tả trao đổi thông báo HTTP mạng máy trạm máy chủ Hình Mơ hình triển khai mạng chia sẻ ngang hàng BTS ISSN: 2615 - 9686 Journal of Science - Hong Bang Interna onal University Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y ĐÁNH GIÁ THỬ NGHIỆM Chúng phát triển ứng dụng BTS thiết lập mạng P2P hỗ trợ thiết bị di động với máy chủ trung tâm phục vụ hoạt động đánh giá chất lượng khởi tạo mạng P2P Ứng dụng BTS cài đặt chương trình giả lập Android, đó, ứng dụng di động máy nh kết nối với mạng P2P vai trò peer Lưu ý kết nối peer thiết bị di động địi hỏi mạng khơng dây volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to Hình Giao diện ứng dụng BTS thiết bị di động Gửi đánh giá chất lượng peer lên máy chủ cách sử dụng yêu cầu HTTP POST Chúng kiểm tra khả sẵn sàng dịch vụ (service availability) mạng thử nghiệm Khả sẵn sàng dịch vụ phụ thuộc lớn vào kết nối ứng dụng di động bị ảnh hưởng số lý bao gồm nguồn lượng, n hiệu đường truyền mạng, lực hệ thống , v.v Chúng sử dụng phòng thực hành gồm 40 máy nh số thiết bị di động để mô mạng P2P quy mô nhỏ gồm 50 peer cài đặt máy trạm ảo Quy mô đủ điều kiện để thực thử nghiệm lỗi kết nối thời gian m kiếm Mạng P2P lớn thời gian m kiếm giảm lỗi kết nối quan trọng nh chất kết nối linh hoạt peer Trong peer thiết lập để thực hoạt động kết nối truyền liệu cách tự động, đo lường lỗi kết nối ứng dụng di động, minh họa Hình 10 bên trái Mạng có điều khiển bao gồm xử lý độ trễ gói n cách sử dụng công cụ điều khiển lưu lượng Journal of Science - Hong Bang Interna onal University ISSN: 2615 - 9686 Hình mô tả giao diện người dùng đồ họa ứng dụng BTS Khi nhận địa IP peer lân cận, ứng dụng BTS vai trò peer kết nối với địa IP để đạt số lượng tối đa kết nối peer lân cận định kỳ kiểm tra (sử dụng thông báo ping/pong) tồn peer lân cận đồng thời cập nhật trạng thái Quá trình quảng cáo m kiếm tài nguyên sách diễn đề cập Do mạng P2P thí nghiệm có kích thước tương đối nhỏ nên thời gian m kiếm sách nhanh Máy chủ trung tâm đóng vai trị quan trọng việc lưu trữ peer thường trực cập nhật đánh giá chất lượng peer Hai chức cho phép peer liên hệ với máy chủ trung tâm là: Nhận đánh giá chất lượng thông qua số điện thoại định danh peer cách sử dụng yêu cầu HTTP GET Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G 10 Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to Hình 10 Lỗi kết nối peer khoảng thời gian khác (bên trái); Thời gian m kiếm sách với nhiều thông báo m kiếm khác (bên phải) Trong vòng 180 phút, số lượng peer giảm khoảng 20% mạng có điều khiển 10% mạng khơng có điều khiển Thử nghiệm tương tự số lượng giới hạn peer Internet có kết kết nối không ổn định khoảng thời gian 30 phút Lỗi kết nối ảnh hưởng lớn đến nh sẵn sàng dịch vụ peer rời mạng P2P biệt mạng P2P không cấu trúc bao gồm chế m kiếm linh hoạt dựa từ khóa ngữ nghĩa Hai vấn đề cịn lại peer có thường xuyên kết nối trực tuyến để đảm bảo tài nguyên sẵn sàng thời gian để thông báo m kiếm gửi đến peer liên quan đến khả sẵn sàng tồn dịch vụ Chúng đo lường hiệu suất m kiếm mạng P2P Phản hồi nhanh điều kiện cần thiết cho khả tồn dịch vụ (service survivability) peer cần kết m kiếm nhanh Chúng sử dụng nhiều thông báo m kiếm với nhiều chí khác mạng P2P để đo đạc thời gian thụ, minh họa Hình 10 phía bên phải Một peer trung bình 2,6 giây để thu nhận thông báo phản hồi cho thông báo m kiếm Lưu ý peer rời tham gia mạng tự động trình thực hoạt động m kiếm sách Có đánh đổi thời gian thụ khả ếp cận peer (dẫn đến số lượng thông báo phản hồi tăng) Khi số lượng peer lân cận tăng lên, số lượng peer nhận thông báo m kiếm tăng lên, khả gửi thông báo phản hồi tăng thời gian thụ cho thông báo m kiếm tăng lên thời gian thụ trung bình cho thơng báo phản hồi giảm Ngoài ra, mạng P2P hiệu việc chia sẻ m kiếm tài nguyên, nghĩa peer lưu giữ tài nguyên cần m peer kết nối trực tuyến, peer khác chắn m thấy tài nguyên này, đặc KẾT LUẬN Mơ hình thương mại điện tử B2C áp dụng thành công cho nhiều miền ứng dụng, mơ hình thương mại điện tử C2C gần thu hút cơng ty người dùng, ví dụ ứng dụng kinh tế chia sẻ, bán lẻ trực tuyến Facebook Các mơ hình chứa đựng vấn đề kiểm sốt quản lý tập trung Chúng tơi đề xuất mơ hình thương mại điện tử C2C phi tập trung tận dụng đặc điểm đáng ý mạng P2P để loại bỏ vấn đề này, cải thiện số vấn đề bao gồm bảo trì cơng nghệ, máy chủ trung tâm, chuyển tảng di động, kiểm soát chất lượng, chi phí bổ sung, dịch vụ tốn trung gian, v.v Chúng cung cấp thiết kế Dịch vụ mua bán sách sử dụng giao thức Gnutella nguyên mẫu ứng dụng BTS tảng di động Android Mơ hình thiết kế đề xuất áp dụng cho số lĩnh vực ứng dụng, nơi việc giao dịch sách trường đại học thử nghiệm Chúng chứng minh chức ứng dụng điển hình đánh giá khả sẵn sàng hiệu suất m kiếm dịch vụ mạng ISSN: 2615 - 9686 Journal of Science - Hong Bang Interna onal University Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 11 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y P2P hỗ trợ thiết bị di động Kết thử nghiệm cho thấy nh sẵn sàng hiệu cao mô hình thương mại điện tử C2C đề xuất ứng dụng BTS Tuy nhiên, mơ hình thiếu giải pháp cho số vấn đề áp dụng cho miền ứng dụng cụ thể, ví dụ, kiểm sốt người bán người mua lừa đảo, xử lý xung đột người bán người mua cung cấp chế giao dịch hiệu Công việc tương lai tập trung vào việc cải thiện áp dụng mơ hình thiết kế đề xuất cho miền ứng dụng thực tế volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to LỜI CẢM ƠN Nghiên cứu tài trợ Trường Đại học Q u ố c t ế H n g B n g v i m ã s ố đ ề tà i GVTC14.1.01 TÀI LIỆU THAM KHẢO Airbnb Company (2008) h ps://www.airbnb.com/ Accessed Aug 2020 Alibaba Group (1999) h ps://www.alibabagroup.com/ Accessed Aug 2020 Amazon Company (1994) h ps://www.amazon.com/ Accessed Aug 2020 Androutsellis-Theotokis, S., Spinellis, D (2004) A survey of peer-to-peer content distribu on technologies ACM Comput Surv., 36(4), 335–371 h ps://doi.org/10.1145/1041680.1041681 Carlsson, B., Gustavsson, R (2001) The rise and fall of Napster - an evolu onary approach In: Liu, J., Yuen, P.C., Li, C., Ng, J., Ishida, T (eds.) AMT LNCS, vol 2252, pp 347–354 Springer: Heidelberg h ps://doi.org/10.1007/3-540-45336-9_40 Clarke, I., Sandberg, O., Wiley, B., Hong, T.W (2001) Freenet: a distributed anonymous informa on storage and retrieval system In: Federrath, H (ed.) Designing Privacy Enhancing Technologies LNCS, vol 2009, pp 46–66 Springer: Heidelberg h ps://doi.org/10.1007/3-540-44702-4_4 Cohen, B (2003) Incen ves build robustness in st Bi orrent In: Proceedings of the Workshop on Economics of Peer-to-Peer Systems Craigslist Company (1995) h ps://www.craigslist.org/ Accessed Aug 2020 eBay Company (1995) h ps://www.ebay.org/ Accessed Aug 2020 Gnutella Protocol Specifica on (version 0.4) (2001) h p://rfc-gnutella.sourceforge.net/developer/stable/ Accessed Jan 2017 XOR metric In: Druschel, P., Kaashoek, F., Rowstron, A (eds.) IPTPS 2002 LNCS, vol 2429, pp 53–65 Springer: Heidelberg h ps://doi.org/10.1007/3-540-45748-8_5 Milojicic, D et al (2002) Peer-to-peer compu ng Technical Report HPL-2002-57R1, HP Laboratories, Palo Alto, USA, April 2002 Ratnasamy, S., Francis, P., Handley, M., Karp, R., Schenker, S (2001) A scalable content addressable network In: Proceedings of the Conference on Applica ons, Technologies, Architectures, and Protocols for Computer Communica ons (SIGCOMM 2001), pp 161–172 New York: ACM Press h ps://doi.org/10.1145/964723.383072 Stoica, I., Morris, R., Karger, D., Kaashoek, M.F., Balakrishnan, H (2001) Chord: a scalable peer-to-peer lookup service for internet applica ons In: Proceedings of the Conference on Applica ons, Technologies, Architectures, and Protocols for Computer Communica ons (SIGCOMM 2001), pp – N e w Yo r k : A C M P r e s s h ps://doi.org/10.1145/964723.383071 Sundararajan, A (2014) What Airbnb Gets About Culture That Uber Doesn't Harvard Business Review h ps://hbr.org/2014/11/ what-airbnb-gets-about-culture-that-uber-doesn't Uber Company (2014) h ps://www.uber.com/ Accessed Aug 2020 Walmart Company (1962) h ps://www.walmart.com/ Accessed Aug 2020 Maymounkov, P., Mazières, D (2002) Kademlia: A peer-to-peer informa on system based on the Yang, B., Garcia-Molina, H (2002) Designing a super-peer network Technical report, Stanford University h p://dbpubs.stanford edu/pub/2002-13 Journal of Science - Hong Bang Interna onal University ISSN: 2615 - 9686 Chapter I n my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since ‘Whenever you feel like criticizing any one,’ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’ He didn’t say any more but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that In consequence I’m in- clined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men Most of the con- fidences were unsought—frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quiver- ing on the horizon—for the intimate revelations of young men or at least the terms in which they express them are usually plagiaristic and marred by obvious suppressions Reserving judgments is a matter of infinite hope I am still a little afraid of missing something if I forget that, as my fa- The Great G 12 Tạp chí KHOA HỌC - Trường Đại học Quốc tế Hồng Bàng Số 14 - 01/2021: 1-12 snobbishly repeat a sense of the fundamental decencies is parcelled out unequally at birth And, after boasting this way of my tolerance, I come to the admission that it has a limit Conduct may be founded on the hard rock or the wet marshes but after a certain point I don’t care what it’s founded on When I came back from the East last autumn I felt that I wanted the world to be in uniform and at a sort of moral attention forever; I want- ed no more riotous excursions with privileged glimpses into the human heart Only Gatsby, the man who gives his name to this book, was exempt from my reaction—Gatsby who represented everything for which I have an unaffect- ed scorn If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away This responsiveness had nothing to with that flabby impressionability which is dignified under the name of the ‘creative temperament’— it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again No—Gatsby turned out all right at the end; it is what preyed on Gatsby, what foul dust floated in the wake of his dream in the abortive sorrows and short- winded elations of men My family have been prominent, well-to-do people in this middle-western city for three generations The Car- Free eBooks at Planet eBook.com raways are something of a clan and we have a tradition that we’re descended from the Dukes of Buccleuch, but the ac- tual founder of my line was my grandfather’s brother who came here in fifty-one, sent a substitute to the Civil War and started the wholesale hardware business that my father car- ries on today I never saw this great-uncle but I’m supposed to look like him—with special reference to the rather hard-boiled painting that hangs in Father’s office I graduated from New Haven in 1915, just a quarter of a century after my father, and a little later I participated in that delayed Teutonic mi- gration known as the Great War I enjoyed the counter-raid so thoroughly that I came back restless Instead of being the warm center of the world the middle-west now seemed like the ragged edge of the universe—so I decided to go east and learn the bond business Everybody I knew was in the bond business so I supposed it could support one more single man All my aunts and uncles talked it over as if they were choosing a prep-school for me and finally said, ‘Why—ye- es’ with very grave, hesitant faces Father agreed to finance me for a y perma- nently, I thought, in the spring of twenty-two The practical thing was to find rooms in the city but it was a warm season and I had just left a country of wide lawns and friendly trees, so when a young man at the office sug- gested that we take a house together in a commuting town it sounded like a great idea He found the house, a weather beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington and I went The Great Gatsby out to the country alone I had a dog, at least I had him for a few days until he ran away, and an old Dodge and a Finnish woman who made my bed and cooked breakfast and mut- tered Finnish wisdom to herself over the electric stove It was lonely for a day or so until one morning some man, more recently arrived than I, stopped me on the road ‘How you get to West Egg village?’ he asked helpless- ly I told him And as I walked on I was lonely no longer I was a guide, a pathfinder, an original settler He had casu- ally conferred on me the freedom of the neighborhood And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer There was so much to read for one thing and so much fine health to be pulled down out of the y Study of Decentralized Customer-to-Customer Ecommerce Model volumes on banking and credit and investment securities and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Mae- cenas knew And I had the high intention of reading many other books besides I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the ‘Yale News’—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the ‘well-rounded man.’ This isn’t just an epigram—life is much more successfully looked at from a single window, after all Free eBooks at Planet eBook.com It was a matter of chance that I should have rented a house in one of the strangest communities in North Ameri- ca It was on that slender riotous island which extends itself due east of New York and where there are, among other natural curiosities, two unusual formations of land Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay, jut out into the most domesticated body of salt water in the Western Hemisphere, the great wet barnyard of Long Island Sound They are not perfect ovals—like the egg in the Columbus story they are both crushed flat at the contact end—but their physical resemblance must be a that fly overhead To the wingless a more arresting phenomenon is their dissimilarity in every particular except shape and size I lived at West Egg, the—well, the less fashionable of the two, though this is a most superficial tag to express the bi- zarre and not a little sinister contrast between them My house was at the very tip of the egg, only fifty yards from the Sound, and squeezed between two huge places that rented for twelve or fifteen thousand a season The one on my right was a colossal affair by any standard—it was a factual imi- tation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin beard of raw ivy, and a marble swimming pool and more than forty acres of lawn and garden It was Gatsby’s mansion Or rather, as I didn’t know Mr Gatsby it was a mansion inhabited by a gentle- man of that name My own house was an eye-sore, but it was a small eye-sore, and it had been overlooked, so I had a The Great Gatsby view of the water, a partial view of my neighbor’s lawn, and the consoling proximity of millionaires—all for eighty dol- lars a month Across the courtesy bay the white palaces of fashionable East Egg glittered along the water, and the history of the summer really begins on the evening I drove over there to have dinner with the Tom Buchanans Daisy was my second cousin once rem just after the war I spent two days with them in Chicago Her husband, among various physical accomplishments, had been one of the most powerful ends that ever played football at New Haven—a national figure in a way, one of those men who reach such an acute limited excellence at twenty-one that everything afterward savors of anti-cli- max His family were enormously wealthy—even in college his freedom with money was a matter for reproach—but now he’d left Chicago and come east in a fashion that rather took your breath away: for instance he’d brought down a string of polo ponies from Lake Forest It was hard to real- ize that a man in my own generation was wealthy enough to that Why they came east I don’t know They had spent a year in France, for no particular reason, and then drifted here and there unrestfully wherever people played polo and were rich together This was a permanent move, said Daisy over the telephone, but I didn’t believe it—I had no sight into Daisy’s heart but I felt that Tom would drift on forever seek- ing a little wistfully for the dramatic turbulence of some irrecoverable football game Free eBooks at Planet eBook.com And so it happened that on a warm windy evening I drove over to East Egg to see two old friends whom I scarce- ly knew at all Their house was even more elaborate than I exp Colonial man- sion overlooking the bay The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walks and burning gardens—final- ly when it reached the house drifting up the side in bright vines as though from the momentum of its run The front was broken by a line of French windows, glowing now with reflected gold, and wide open to the warm windy afternoon, and Tom Buchanan in riding clothes was standing with his legs apart on the front porch He had changed since his New Haven years Now he was a sturdy, straw haired man of thirty with a rather hard mouth and a supercilious manner Two shining, arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward Not even the effeminate swank of his riding clothes could hide the enormous power of that body—he seemed to fill those glistening boots until he strained the top lacing and you could see a great pack of muscle shifting when his shoulder moved under his thin coat It was a body capable of enor- mous leverage—a cruel body His speaking voice, a gruff husky tenor, added to the im- pression of fractiousness he conveyed There was a touch of paternal contempt in it, even toward people he liked—and there were men at New Haven who had hated 2,* Tran Trung Dung and Tran Manh Ha these matters is final,’ 10 The Great Gatsby he seemed to say, ‘just because I’m stronger and more of a man than you are.’ We were in the same Senior Society, and while we were never intimate I always had the impression that he approved of me and wanted me to like him with some harsh, defiant wistfulness of his own We talked for a few minutes on the sunny porch ‘I’ve got a nice place here,’ he said, his eyes flashing about restlessly Turning me around by one arm he moved a broad flat hand along the front vista, including in its sweep a sunken Italian garden, a half acre of deep pungent roses and a snub- nosed motor boat that bumped the tide off shore ‘It belonged to Demaine the oil man.’ He turned me around again, politely and abruptly ‘We’ll go inside.’ We walked through a high hallway into a bright rosy- colored space, fragilely bound into the house by French windows at either end The windows were ajar and gleaming white against the fresh grass outside that seemed to grow a little way into the house A breeze blew through the room, blew curtains in at one end and out the other like pale flags, twisting them up toward the frosted wedding cake of the ceiling—and then rippled over the wine-colored rug, mak- ing a shadow on it as wind does on the sea The only completely stationary object in the room was an enormous buoyed up as though upon an anchored balloon They were both in white and their dresses were rippling and fluttering as if they had just been blown back in after a short flight around the house I must have stood for a few moments listening to ABSTRACT The customer-to-customer (C2C) ecommerce model allows customers to purchase goods or services, and transfer money through direct or indirect transac ons This model usually depends on mediate companies to deal with the main challenges of technology maintenance and quality control This paper presents a decentralized C2C ecommerce model based on mobile peer-to-peer (P2P) networks Several remarkable features of the mobile P2P networks include autonomy in control and administra on, scalability and reliability in par cipants and resources These features not only avoid centralized servers and technology maintenance but also facilitate quality control by selec ng various quality par cipants and resources using flexible search mechanisms on mobile devices We have provided the design of Book Trading Service (BTS) using Gnutella protocol and the prototype of the BTS applica on on Android mobile pla orm Experimental results depict the feasibility and effec veness of the decentralized C2C ecommerce model and the BTS applica on that can also be applied to several applica on domains Keywords: C2C ecommerce model, P2P network, distributed compu ng, mobile compu ng Received: 11/12/2020 Revised: 23/12/2020 Accepted for publica on: 11/01/2021 ISSN: 2615 - 9686 Journal of Science - Hong Bang Interna onal University