1 an introduction to dns

... prefer; both command-line and graphic clients exist, and anyone can write a new user interface to transfer files Where drivers are concerned, the same separation of mechanism and policy applies ... parts: Figure 1- 1 A split view of the kernel Process management The kernel is in charge of creating and destroying processes and handling their connection to the outside world (input and output) ... programs, and the window and session managers, which implement a particular policy without knowing anything about the hardware People can use the same window manager on different hardware, and different...

Ngày tải lên: 24/12/2013, 01:17

... 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 97 97 97 97 97 97 97 ... Cl 27 12 2 75 13 7 11 80 11 2 40 12 35 lead magnesium manganese mercury nickel nitrogen oxygen phosphorus potassium silicon Pb Mg Mn Hg Ni N O P K Si 207 24 55 2 01 59 14 16 31 39 28 MOLECULES AND ... 62 62 61 60 59 59 58 57 57 56 56 55 55 54 53 52 51 51 51 50 64 64 63 63 62 61 61 60 60 59 58 57 56 55 55 54 53 52 52 51 51 50 50 49 49 48 47 46 62 61 61 60 60 59 58 58 57 56 55 54 53 52 51 50 50...

Ngày tải lên: 23/03/2014, 01:20

... 14 ,200 234 ,15 0 $ 248,350 (12 ,10 0) $ 236,250 Inventory Flows Beginning Beginning balance balance + Additions Additions to inventory to inventory = Ending Ending balance balance + Withdrawals Withdrawals ... be the balance at the end of the month? $1, 000 + $10 0 = $1, 100 A $1, 000 $1, 100 - $300 = $800 B $ 800 C $1, 200 D $ 200 Learning Objective LO4 To prepare the schedule of cost of goods manufactured ... activity changes changes  Total fixed costs remain  Total fixed costs remain unchanged when activity unchanged when activity changes changes Total Variable Cost Total Long Distance Telephone...

Ngày tải lên: 29/06/2014, 13:20

... Mate:2 and deselect Mate :1 and see how the joint has now created changes to a Planar Joint 33 CHAPTER An Introduction to Inventor Simulation The reason for this is the Second Mate:2 (Arm2 :1, Arm1 :1) ... Slider :1) redundant joint has changed to: Point-Line:3 (Arm2 :1, Slider :1) nonredundant joint as illustrated below 18 Close fi le CHAPTER An Introduction to Inventor Simulation EXAMPLE CAM Design – Manually(bằng ... Cylindrical 1, 3,4,5,6,7 Spherical 3,4,6 Planar Point-Line 2&3 3,6,7 Line-Plane Point-Plane Spatial Not used 10 14 Welding 11 RI Cylinder on Plane 12 RI Cylinder on Cylinder 13 RI Cylinder in Cylinder 14 ...

Ngày tải lên: 05/07/2014, 19:21

... good way, will allow us to enter and store data, analyse the data and transfer it to humans or to other systems We will now look at setting up real world representations 1. 2 .1 Modelling ‘Modelling’ ... forecasted to occur at the end of the year 20 01 N.D Bình 2 /16 7 Chapter An introduction to GIS ERS 12 0: Principles of Geographic Information Systems Figure 1. 1: The El Niño event of 19 97 compared ... in Section 1. 1.2 But first, let us try to make some clear observations about our points of departure 1. 1 .1 Some fundamental observations Our world is constantly changing, and not all changes are...

Ngày tải lên: 21/10/2014, 10:09

... xác định xem chúng có sử dụng hiệu nguồn lực khan hay không Giới thiệu  Các dự án thể việc sử dụng nguồn lực hiệu theo ‘quan điểm tư nhân’ liên quan đến chi phí lợi ích nhiều người khác, không ... tích lợi ích – chi phí $UA $10 0 UF a $75 $25 c $25 Một thay đổi làm phúc lợi chuyển từ trạng (điểm C) đến điểm thuộc vùng ABC gọi cải thiện phúc lợi Pareto thực tế b $75 $10 0 $UB Phương pháp luận ... pháp luận phân tích lợi ích – chi phí $UA $90 e a c $10 $10 b d $90 $UB Phương pháp luận phân tích lợi ích – chi phí $UA UF a $75 d’ $40 $25 $10 Một thay đổi làm phúc lợi chuyển từ trạng (điểm...

Ngày tải lên: 20/11/2014, 13:46

... CHƯƠNG CHƯƠNG CHƯƠNG CHƯƠNG CHƯƠNG CHƯƠNG 10 CHƯƠNG 11 CHƯƠNG 12 CHƯƠNG 13 CHƯƠNG 14 CHƯƠNG 15 CHƯƠNG 16 CHƯƠNG 17 CHƯƠNG 18 CHƯƠNG 19 CHƯƠNG 20 CHƯƠNG 21 CHƯƠNG 22 CHƯƠNG 23 CHƯƠNG 24 CHƯƠNG 25 ... mà anh chẳng quan tâm đến em, anh hoàn to n Bill: Được rồi, em bịt tai lại không thèm nghe lời anh nói tốt Anh nói anh yêu em Anh nói, anh đứng đây, anh cố gắng nói chuyện với em, em làm thể anh ... chuyện với Susan: Đó cảm giác em Anh biết nói “anh, anh, anh.” Anh biết đến cảm xúc - anh chẳng biết điều xảy với em hết Bill: Bởi em điếc Em không thèm nghe lời anh nói với em Em gạt anh sang bên...

Ngày tải lên: 25/12/2013, 22:35

... 10 Fiefs and Suzerains of the Counts of Champagne 11 3 11 France at the Close of the Reign of Philip Augustus 12 9 12 The Plantagenet Possessions in England and France 14 1 13 Europe about A.D 10 00 ... 10 00 15 2 15 3 14 Italian Towns in the Twelfth Century 17 5 15 Routes of the Crusaders 19 0 19 1 16 The Crusaders' States in Syria 19 3 17 Ecclesiastical Map of France in the Middle Ages 205 18 Lines ... history teaches Historians sometimes seem to forget this principle, when they claim to begin and end their books at precise dates We find histories of Europe from 476 to 918 , from 12 70 to 14 92,...

Ngày tải lên: 16/02/2014, 23:20

... When α ≡ 1, our (ODE) becomes x1 = x2 ˙ x2 = −x1 + ˙ 38 r1 (1, 0) In this case, we can calculate that d ˙ ˙ ((x1 (t) − 1) 2 + (x2 )2 (t)) = 2(x1 (t) − 1) x1 (t) + 2x2 (t)x2 (t) dt = 2(x1 (t) − 1) x2 ... x1 = X(t)x0 + X(t) X 1 (s)N 1 (s) ds t x2 = X(t)x0 + X(t) X 1 (s)N α2 (s) ds Let ≤ λ ≤ Then t λx1 + (1 − λ)x2 = X(t)x0 + X(t) X 1 (s)N (λ 1 (s) + (1 − λ)α2 (s)) ds, 32 ∈A and hence λx1 + (1 ... now α ≡ 1 on some time interval Then as above q=v ˙ v = 1, ˙ and hence ˙ (v )˙ = −q 11 v-axis α = -1 q-axis curves v2=-2q + c Let t1 belong to an interval where α ≡ 1 and integrate: (1. 2) v (t)...

Ngày tải lên: 24/03/2014, 12:20

... 88 89 94 94 97 10 2 10 4 10 8 10 9 11 0 11 1 11 4 11 5 11 6 11 7 11 9 12 0 12 4 CONTINUOUS FUNCTIONS 3 .1 3.2 Informa1 description of continuity The definition of the limit of a function 12 6 12 7 Contents xii ... mean-value theorem to geometric properties of functions Second-derivative test for extrema Curve sketching Exercises 15 6 15 7 15 9 16 1 16 4 16 7 16 9 17 1 17 3 17 4 17 6 cc 17 9 18 1 18 3 18 6 18 7 18 8 18 9 19 1 ... 3 .18 The integrability theorem for continuous functions 3 .19 Mean-value theorems for integrals of continuous functions 3.20 Exercises 13 0 13 1 13 5 13 8 14 0 14 2 14 2 14 4 14 5 14 6 14 7 14 8 14 9 15 0 15 2...

Ngày tải lên: 12/06/2014, 16:19

... Third Manifesto, as well as in the book itself As noted earlier, The Third Manifesto also includes a definition of Tutorial D──although, to be frank, there shouldn't be any need to refer to that ... directly relevant to the topics at hand (End quote) The fact is, given the widespread availability and use of database systems today (on desktop and laptop computers in particular), many people ... into six parts), together with four appendixes, as follows: Part I : Preliminaries An Overview of Database Management Database System Architecture An Introduction to Relational Databases An Introduction...

Ngày tải lên: 06/08/2014, 01:21

... combination of a DC manager and a DBMS, in which the DBMS looks after the database and the DC manager handles all messages to and from the DBMS (or, more accurately, to and from applications ... system that manages stored files (it's "closer to the disk" than the DBMS is) It supports the creation and destruction of stored files and simple retrieval and update operations on stored records ... that's deliberate, and so is the lack of reference to the ACID acronym.) Superficial!──this is just an introduction Forward references to Chapters 15 and 16 3.9 The Suppliers-and-Parts DB More...

Ngày tải lên: 06/08/2014, 01:21

... simplifies to: ( ( S WHERE CITY = 'London' ) JOIN ( SP WHERE P# = P# ('P2') ) ) { S# } For further discussion and explanation, see Chapters 10 and 18 3.6 Atomicity means that transactions are guaranteed ... me more trouble than anything else in producing the eighth edition The 19 99 standard is simultaneously enormous in size and extremely hard to understand (in this regard, you can get a sense of ... end-oftransaction Any updates made to the database by the transaction in question are "rolled back" (undone) and are never made visible to other transactions • A set-level operation is an operation...

Ngày tải lên: 06/08/2014, 01:21

... operator and function To be specific, SQL uses function to mean an operator that's invoked by means of classical functional notation──or an approximation to that notation, at any rate!──and operator ... BB CARTESIAN, EE CARTESIAN ) NOT FINAL ; 5 .17 See Answer 4 .1 and Answer 5 .16 5 .18 No answer provided 5 .19 See Section 5.7, subsection "Structured Types." 5.20 No answer provided 5. 21 Such a type──we ... (and they don't allocate any storage) It is very unclear as to (a) why SQL allows some types not to have an "=" operator and (b) why it allows the semantics of that operator to be user-defined when...

Ngày tải lên: 06/08/2014, 01:21

... │ c1 │ │ │ │ └────┘ │ │ c3 │ │ │ │ │ │ c4 │ │ │ │ │ └────┘ │ └────┴────────┴────────┘ ┌────┬────┬────┐ │ A │ B │ C │ ├════┼════┼════┤ │ a1 │ b1 │ c1 │ │ a1 │ b1 │ c2 │ │ a1 │ b2 │ c1 │ │ a1 │ ... a2 │ b1 │ c1 │ │ a2 │ b1 │ c3 │ │ a2 │ b1 │ c4 │ └────┴────┴────┘ A more concrete example resembling this second pair of relations will be discussed in Chapter 13 6 .11 P{} = TABLE_DUM Explanation: ... does not cause any confusion (End quote) The foregoing remarks are particularly pertinent to discussions of views (Chapter 10 ) and dependencies and further normalization (Chapters 11 -13 ) 7.2 Closure...

Ngày tải lên: 06/08/2014, 01:21

... is supplied by some supplier */ ( T10 MINUS T7 ) AS T 11, /* T 11 {SA,SB,P#} : part P# is supplied, but not by both SA and SB */ ( T6 INTERSECT T 11 ) AS T12, /* T12 {SA,SB,P#} : part P# is supplied ... INTERSECT T 11 ) AS T13, /* T13 {SA,SB,P#} : part P# is supplied by SB but not by SA */ T12 { SA, SB } AS T14, /* T14 {SA,SB} : SA supplies some part not supplied by SB */ T13 { SA, SB } AS T15, /* T15 ... aggregate operators ALL and ANY, both of which operate on arguments consisting of boolean values; ALL returns TRUE if and only if all arguments evaluate to TRUE, ANY returns TRUE if and only if any argument...

Ngày tải lên: 06/08/2014, 01:21

... are range variables ranging over suppliers, parts, projects, and shipments, respectively; definitions of those range variables aren't shown 8 .13 .13 JX 8 .13 .14 JX WHERE JX.CITY = 'London' 8 .13 .15 ... WHERE SPJX.J# = J# ( 'J1' ) 8 .13 .16 SPJX WHERE SPJX.QTY ≥ QTY ( 300 ) AND SPJX.QTY ≤ QTY ( 750 ) 8 .13 .17 { PX.COLOR, PX.CITY } Copyright (c) 2003 C J Date 8 .11 page 8 .13 .18 { SX.S#, PX.P#, JX.J# ... 8 .14 .13 SELECT * FROM J ; Or simply: TABLE J ; 8 .14 .14 SELECT J.* FROM J WHERE J.CITY = 'London' ; 8 .14 .15 SELECT DISTINCT SPJ.S# FROM SPJ WHERE SPJ.J# = J#('J1') ; 8 .14 .16 SELECT FROM WHERE AND...

Ngày tải lên: 06/08/2014, 01:21

... series, especially the 19 91- 1994 and 19 94 -19 97 volumes (Addison-Wesley, 19 95 and 19 98, respectively); see also the two editions, coauthored with Hugh Darwen, of the Third Manifesto book Other writers ... Prentice Hall, 19 97) • Ralph Kimball (Intelligent Enterprise 3, Nos 11 and 12 , August 1st and 18 th, 2000, respectively) • Ron Ross (The Business Rule Book: Classifying, Defining, and Modeling Rules, ... some detail in reference [11 .7] 9 .13 Clearly, if a candidate key can be empty, then so can a matching foreign key──and nullary foreign keys, like nullary candidate keys, can certainly be useful...

Ngày tải lên: 06/08/2014, 01:21

... it does work can be regarded as an optimization 10 .12 Yes! 10 .13 Yes! 10 .14 INSERT and DELETE will always be inverses of each other so long as (a) the database is designed in accordance with The ... fairly self-explanatory (though project is a little trickier than the operators covered prior to this point) Note: The subsection says: "An attempt to update the SC tuple (S1,London) to (S2,London) ... (S1,Smith,20,London,P1,400) into SSP will fail (why?) Answer: Key uniqueness violation on SP • An attempt to update the SSP tuple (S1,Smith,20,London,P1,300) to (S6,Smith,20,London,P1,300) will "succeed"──see...

Ngày tải lên: 06/08/2014, 01:21

... FDs 11 .13 FDs: No answer provided Candidate keys: L, DPC, and DPT 11 .14 Abbreviating NAME, STREET, CITY, STATE, and ZIP* to N, R, C, T, and Z, respectively, we have: N → RCT RCT → Z Z → CT An ... { } → { } 11 .8 {A,C}+ = {A,B,C,D,E} question is yes The answer to the second part of the 11 .9 Two sets S1 and S2 of FDs are equivalent if and only if they have the same closure 11 .10 A set of ... two 11 .12 The first step is to rewrite the given set such that every FD has a singleton right side: AB C BC ACD BE CE CE → → → → → → → C A D B C A F Copyright (c) 2003 C J Date page 11 .7 11 11 ...

Ngày tải lên: 06/08/2014, 01:21