a distributed polling service based medium access control protocol prototyping and experimental
Báo cáo hóa học: " Research Article Energy-Efficient Reservation-Based Medium Access Control Protocol for Wireless Sensor Networks" doc
... nDL LDATA nDL + L + tST + ACK (12) R TDATA R TDATA LDATA nDL L n +1 + tST + ACK DL , R TDATA R TDATA (13) LDATA R TDATA (15) In B-MAC, all data in a radio range is received As a leaf node has ... channel access mechanisms and comparing them against the designed TUTWSN MAC The focus is on data and ACK frame exchanges and on the maintenance of link synchronization by a beacon or SYNC frame ... Channel Access MAC protocol can be divided into channel access and networking mechanisms The channel access mechanism defines radio utilization for maintaining synchronization and exchanging frames...
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Medium access control survey kumar
... approaches used in power-aware MAC schemes have their advantages 349 and disadvantages in data communication, as briefly discussed below Power management based MAC schemes such as PAMAS [27] achieve ... access and Ôdynamic reservation/collision resolutionÕ protocols as shown in Fig 2 (a) [12] In random access based schemes, such as ALOHA, a node may access the channel as soon as it is ready Naturally, ... this anomaly In order to calculate backoff intervals, the authors have proposed two alternate approaches: linear mapping and exponential mapping A disadvantage of the linear mapping scheme is that...
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Báo cáo hóa học: " Energy-Efficient Medium Access Control Protocols for Wireless Sensor Networks" docx
... be active and, more importantly, when not As a TDMA -based energy-efficient MAC protocol, traffic-adaptive medium access (TRAMA) [13] employs a trafficadaptive and distributed election scheme to allocate ... 0.4 Average clock-drift rate (ms/s) 0.45 0.5 ASMAC S-MAC TRAMA A- MAC S-MAC (a) (b) Figure 13: Energy utilization for (a) A- MAC and (b) ASMAC Table 3: Physical layer parameters Ww 32 Ww max 1024 ... 0.09 Average clock-drift rate (ms/s) 0.1 Clock-drift rate (ms/s) S-MAC TRAMA ASMAC A- MAC S-MAC (a) (b) Figure 14: Successful transmission rate for (a) A- MAC and (b) ASMAC 24 14 22 Average waiting...
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Báo cáo hóa học: " Multihop Medium Access Control for WSNs: An Energy Analysis Model" potx
... IEEE International Workshop on Sensor Network Protocols and Applications (SNPA ’03), pp 1– 8, Anchorage, Alaska, USA, May 2003 [6] W R Heinzelman, A Chandrakasan, and H Balakrishnan, “Energy-efficient ... the data has to be retransmitted at a later time As a deviation from the original paper, the ACK frame is transmitted on the same channel as data 2.4.2 S-MAC The S-MAC [14] operation and frame ... enhanced probability of not having a collision during CTS transmission and CTS and Data are times needed to transmit a CTS frame and a data frame, respectively From the above equations we can...
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Báo cáo hóa học: " An Optimal Medium Access Control with Partial Observations for Sensor Networks" docx
... Berlin, Germany, 2001, available from http://www.statslab.cam.ac uk/frank/PAPERS/ [5] R J La and V Anantharam, “Utility -based rate control in the Internet for elastic traffic,” IEEE/ACM Trans Networking, ... International Workshop on Sensor Network Protocols and Applications (SNPA ’03), pp 1– 8, Anchorage, Alaska, USA, May 2003 [9] C.-Y Wan, S Eisenman, and A Campbell, “CODA: COngestion Detection and Avoidance ... Kumar and P Varaiya, Stochastic Systems: Estimation, Identification and Adaptive Control, Prentice-Hall, Englewood Cliffs, NJ, USA, 1986 S P Meyn and R L Tweedie, Markov Chains and Stochastic Stability,...
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Design of medium access control techniques for cooperative wireless networks
... networks, media access control is a sublayer of the data link layer as shown in Fig 1.1 Since medium access control and media access control are often used interchangeably, we use medium access control ... CMDMAC Cooperative multi-channel directional medium access control CQI Channel quality indicator CSC Conservative strategy with cooperation CSMA/CA Carrier sense multiple access /collision avoidance ... cooperation BPSK Binary phase-shift keying BTS Base transmission station CAMMAC Cooperative asynchronous multi-channel medium access control CBP Cooperation backoff period CCA Clear channel assessment...
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TIME DOMAIN MEDIUM ACCESS CONTROL PROTOCOLS FOR UNDERWATER ACOUSTIC NETWORKS
... MACA -based schemes and Dynamic-TDMA based schemes are good choices in UAN MAC • An accurate Markov chain based analytical model for a novel MACA based protocol (MACA-EA) for UANs has been obtained ... centralized MACA-C protocol, distributed MACA-EA protocol and a DATA-ACK protocol (the term DATA shall be used for data packets) and show how a combined adaptive scheme can be useful in UAN MAC This protocol ... for UANs, Chapter presents a mathematical analysis of a MACA -based protocol with batch data for ad hoc underwater acoustic networks (UAN) Sea trial results corroborated simulation and analytical...
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Medium access control and energy efficient routing for mobile ad hoc networks
... Each routing protocol has advantages and disadvantages, and fits well for certain situations Hybrid protocols combine the techniques of table-driven and demanddriven protocols trying to obtain ... On-demand AODV DSR LAR SSA ABR Flat Flat Flat Flat Flat Freshest & Shortest Path Shortest Path Shortest Path Associatively Associatively & Stability & Shortest Path Convergence Passive Passive Passive ... cannot perform any transmission in the same data slot again In the third sub-slot, nodes A, B, C and K are disabled by rule 2; nodes E and F rebroadcast the signal, and signal reaches the remaining...
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Tài liệu Access Control List Basics and Extended Ping ppt
... discards packets matching the criteria on that line Two important keywords that can be used with IP addresses and the access list command are any and host The keyword any matches all hosts on all networks ... standard ACL can match only at the source address of a packet Step On the Vista router, create the following standard ACL and apply it to the LAN interface: Vista#config t Vista(config) #access- list ... Vista(config)#interface fastethernet 0/0 Vista(config-if)#ip access- group 50 out Vista(config-if)#^Z Syntax and Keywords The basic syntax for creating an access list entry is as follows: router(config) #access- list...
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Tài liệu Access Control List Basics and Extended Ping doc
... discards packets matching the criteria on that line Two important keywords that can be used with IP addresses and the access list command are any and host The keyword any matches all hosts on all networks ... standard ACL can match only at the source address of a packet Step On the Vista router, create the following standard ACL and apply it to the LAN interface: Vista#config t Vista(config) #access- list ... Vista(config)#interface fastethernet 0/0 Vista(config-if)#ip access- group 50 out Vista(config-if)#^Z Syntax and Keywords The basic syntax for creating an access list entry is as follows: router(config) #access- list...
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Báo cáo khoa học: A new molecular tool for transgenic diatoms Control of mRNA and protein biosynthesis by an inducible promoter–terminator cassette docx
... (GenBank accession number X52869) was amplified from pZEOSV (Invitrogen, Carlsbad, CA, USA) by PCR using sense primer 5¢-ATCAAAACAACCAAAA TGGCCAAGTTGACCAGTGC-3¢ and antisense primer 5¢-GAATGCGGCCGCTCAGTCCTGCTCCTCGGCCAC-3¢, ... Biosciences, Columbia, MD, USA) with sense primer SOE-3 (5¢-AAAAATCA ACGCTGAACAATGGTGAGCAAAGGGCGAG-3¢) and antisense primer SOE-4 (5¢-GAATGCGGCCGCTTACT TGTAACAGCTCGTCCATG-3¢), which introduced a NotI site ... 165-bp fragment of the fcp 5¢-UTR was amplified by PCR from pUC18 ⁄ fcp1.9kb using the sense primer 5¢-GAT CTTTGCTACGTACGAACG-3¢ and the antisense primer 5¢-GCTCTAGAGATATCTAGTCTTTGTGATAAAGAAA ATTATG-3¢...
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Media Gateway control protocol architecture and requirements Nancy Greene, Michael A. Ramalho, Brian Rosen pdf
... and inserted in the line-side audio stream Analyzed and sent as part of a separate RTP stream (e.g., DTMF digits sent via a RTP payload separate from the audio RTP stream) Taken from a separate ... carries user media content and may carry telephony signalling (MF, R2, etc.) Digital trunks may be transported and may appear at the Media Gateway as channels within a framed bit stream, or as ... and application of signals associated with basic analogue line, and CAS type signalling The protocol must: a Support the signalling requirements of analogue lines and Channel Associated Signaling...
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Báo cáo hóa học: " A survey of performance enhancement of transmission control protocol (TCP) in wireless ad hoc networks" pptx
... causes unnecessary attempts for data transmission The third approach based on signal strength is ATRA The route failure and re-establishment mechanisms of ATRA and ELFN are the same, but ATRA ... contention and collision among Data and ACK packets TCP dynamic adaptive ACK (TCP-DAA) strategy TCP-DAA [54] is another solution that belongs to the category of generating a delayed ACK, which generates ... forwarding further packets To resume the transmission after a NCTS message, the receiver initiates the three-way handshake mechanism CTS/DATA/ ACK instead of the RTS/CTS/DATA/ACK handshake mechanism...
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A solid shell element based on relative displacements concept theory and applications
... A SOLID SHELL ELEMENT BASED ON RELATIVE DISPLACEMENTS CONCEPT: THEORY AND APPLICATIONS MA YONGQIAN B.Eng (Nanjing University of Aeronautics and Astronautics, P.R.China), M.Eng.(Zhejiang University, ... M.Eng.(Zhejiang University, P.R.China) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CIVIL ENGINEERING NATIONAL UNIVERSITY OF SINGAPORE 2006 ...
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Tài liệu Proposal for Fast-Tracking NIST Role-Based Access Control Standard doc
... “establishing a taxonomy and a shared vocabulary for us, our customers, and the industry as a whole” Is RBAC ready for a standard? • Network Applications Consortium $500,000,000,000 customer base says: ... implement all RBAC features – Research continues to promote its use in other applications and extended features Solution - RBAC Standard • Standardization over a collection of basic and well accepted ... scattered over many platforms and applications Who are the valid users? What are they entitled to access? How you keep access rights up-todate? How you specify and enforce policy? Maintaining Access Configurations...
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Tài liệu Tìm hiểu về Permission và Role Based Access Control – RBAC (phần 1) docx
... lập mailbox - Help Desk: dùng để kiểm tra thông tin tổng quát thay đổi tùy chọn Microsoft Office Outlook Web App - Hygiene Management: thay đổi chế độ bảo mật Exchange - Organization Management: ... Management: để xem kiểm tra thuộc tính đối tượng Exchange Predefined Role: Trước tiên, bạn mở Exchange Management Console, phần c a sổ bên trái chọn Toolbox, kéo xuống ph a nhấn Role Based Access ... quản trị cần triển khai mô hình server Exchange 2010 cung cấp role group Organization Management - Discovery Management: tài khoản Admin muốn tìm kiếm liệu hệ thống mailbox d a vào thông tin ưu...
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Tìm hiểu về Permission và Role Based Access Control – RBAC (phần 1) pdf
... lập mailbox - Help Desk: dùng để kiểm tra thông tin tổng quát thay đổi tùy chọn Microsoft Office Outlook Web App - Hygiene Management: thay đổi chế độ bảo mật Exchange - Organization Management: ... quản trị cần triển khai mô hình server Exchange 2010 cung cấp role group Organization Management - Discovery Management: tài khoản Admin muốn tìm kiếm liệu hệ thống mailbox d a vào thông tin ưu ... cho RBAC, phần lại dùng trực tiếp Exchange Trong viết này, chủ yếu tập trung vào role group RBAC Các Predefined Role Group sử dụng Exchange Server 2010 Role Based Access Control: - Delegated Setup:...
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báo cáo hóa học:" Determinants of Treatment Access in a Population-based Cohort of HIV-positive Men and Women Living in Argentina" pdf
... lopinavir, atazanavir, or fosamprenavir) Statistical Analysis The first analysis evaluated participant characteristics associated with initiation of HAART Baseline variables were measured within ... associated with HAART initiation AIDS-defining illness and viral load were also associated with time to initiation of and late access to HAART As expected, those who started HAART in this study had ... didanosine, and zidovudine for HIV-infected patients: the INCAS Trial Italy, The Netherlands, Canada and Australia Study JAMA 1998, 279:930-937 Abstract Braitstein P, Brinkhof MW, Dabis F, et al.: Mortality...
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báo cáo hóa học:" Challenges in access to health services and its impact on Quality of Life: a randomised population-based survey within Turkish speaking immigrants in London" ppt
... women’s health, mental health, and alcohol and smoking habits has been assessed The aim of this study was to explore the ongoing challenges in access to health care services and its impact on Quality ... vulnerable groups, they face with various obstacles in access to health care services Studies draw attention to cultural and linguistic barriers and a lack of information or understanding about ... England and can be traced to the 1920s Increased numbers arrived in the 1940s and late 1950s A large wave from Cyprus came in the 1960s after the island became independent Another large wave came...
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