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U. Houston - COSC - 6397
More on Gaussian Distribution( x )2 f ( x) = exp( ) 2 2 2 2 1X ~ (x,2x, Y ~ (y, 2y), X & Y are independent, then X+Y ~ (x+y, 2x+2y) X ~ (x,2x), then aX ~ (ax,a22x) Error function erferf ( z ) = 2e0zt 2dt2 x 1 e t / 2 dt = [1 + erf
U. Houston - COSC - 6397
Wireless Application Protocol (WAP)Characteristics of mobile devices and mobile networksSmall screens Limited device memory Less powerful CPUs Limited bandwidth availability Unreliable connections High latencyOpen standard providing mobile users
U. Houston - COSC - 6397
Medium Access Control LogicStartPacket arrivalMedium idleMedium busydeferexpiredRandom BackoffMedium busyTransmitFreezeCollision detectedCW = min(2(CW+1) 1, CWmax)Interframe Space (IFS)Short IFS (SIFS)Shortest IFS (used for A
U. Houston - COSC - 6397
Lecture 2: Wireless Channel Propagation & Modulation Techniques13Police Radar14Basics IRandom variable XIf a probability distribution has density f(x), then intuitively the infinitesimal interval [x, x + dx] has probability f(x) dx. x Cumul
U. Houston - COSC - 6397
What is a computer program?"A combination of computer instructions and data definitions that enable computer hardware to perform computational or control functions"Instructions Data What is missing here?User Interface!inputInstructionsoutput
U. Houston - COSC - 6397
Location & Context Awareness117Potential Killer Apps for Wireless Data NetworksExploit location specific informationFind the nearest {caf, movie theater, } Wireless dating match-maker gameMobiCom 2002 Talk by Ed. Knightly118What is Contex
U. Houston - COSC - 6397
Emerging Wireless Networks178OutlineScopeWireless sensor network Lower Power Personal area networks Wireless mesh networksFocusTechnology overview Representative projects/solutions179Adopted from D. Estrin's Mobicom'02 tutorialEmbedded
U. Houston - COSC - 6397
Oneprojectcoordinator:Coordinateinterfacing,jointtesting Oneteamleader:Setupgoals,updateburndownchart.Ensurethesubprojectisontrack. Teammembers:carryoutthetasks,peerevaluations Useagileprogrammingstyle:setupimmediatemilestonestwoweeksahead;contin
U. Houston - COSC - 6397
Process MigrationMovement of a currently executing process to a new processor Process migration mechanism how the system migrates a process from source to destinationHomogenous Heterogeneous Distributed shared memoryRemote execution process exe
U. Houston - COSC - 6397
1COSC6397 Homework Assignment 1 (Larger-scale Fading)Solution Problem 1. Suppose a transmitter produces 50W of power. a. Express the transmit power in units of dBm and dBW. b. If the transmitters power is applied to a unity gain antenna with a 900
U. Houston - COSC - 6397
COSC6397 Homework Assignment 3September 22, 20041Part 1: Routing1. Find the shortest path tree from every node to node 1 for the graph of Fig.1 using the Bellman-ford and Dijkstra algorithms.10 2 4 6 3 4 5 3 9 6 3 2 3 4 3 2 6 5 2147Fig
U. Houston - COSC - 7397
Robust Rate Adaptation for 802.11 Wireless NetworksStarsky H.Y. Wong1 , Hao Yang2 , Songwu Lu1 and Vaduvur Bharghavan3Dept. of Computer Science, UCLA, 4732 Boelter Hall, Los Angeles, CA 90025 1 IBM T.J. Watson Research, 19 Skyline Drive, Hawthorne,
U. Houston - COSC - 6397
Destination Sequenced Distance Vector (DSDV)Based on Bellman-ford algorithm with the following changes:Each routing table entry keeps (destination, next-hop, hop-count, seq, install time), seq is assigned by a destination nodeDestination A B C D N
U. Houston - COSC - 6397
I/O Multiplexing and Posix ThreadsCOSC 6397Rong Zheng1Possible Mechanisms for Creating Concurrent Service1. ProcessesKernel automatically interleaves multiple logical flows. Each flow has its own private address space.2. I/O multip
U. Houston - COSC - 6377
Fall 2007 COSC 6377 Computer Networks Instructor: Rong Zheng Email: rzheng@cs.uh.edu Lecture time: 4:00pm 5:30pm, MW Location: 205 sec Office Hours: 2:00pm 4pm M; 5:30 6:30 W Class web: Go to www.uh.edu/webct, click on WebCTVista button Lab: PGH 5
U. Houston - COSC - 6397
GPSR: Greedy Perimeter Stateless Routing for Wireless NetworksProposed by Brad Karp and H.T. Kung Uses Position Information to make routing decisionsRouting based on destinations geographical location Only need to maintain neighbors location inform
U. Houston - COSC - 6397
COSC6397 Homework Assignment 3September 15, 20041Part 1: Routing1. Find the shortest path tree from every node to node 1 for the graph of Fig.1 using the Bellman-ford and Dijkstra algorithms.10 2 4 6 3 4 5 3 9 6 3 2 3 4 3 2 6 5 2Due date: Se
U. Houston - COSC - 6377
Fall 2005 COSC 6377 Computer Networks Instructor: Rong Zheng Email: rzheng@cs.uh.edu Lecture time: 4:00pm 5:30pm, MW Location: 138-SR Office Hours: 2:30pm 4pm, MW TA: Mohammad A Muqsith (muqsith1530@yahoo.com) TA Office Hours: 2:00pm 4pm, TTh Clas
U. Houston - COSC - 6397
COSC 6397 Wireless Networking and Mobile ComputingDr. Rong Zheng rzheng@cs.uh.edu1Mobile computing Wireless networkingMobile computing computing on the move, can be wired Wireless networking facilitates mobile computing with flexibility of mo
U. Houston - COSC - 6375
COSC 6375: Computer System Performance EvaluationSpring 2009 Instructors: Email: Lectures Office Hours: Class web site: Textbook: Hisashi Kobayashi and Brian L. Mark, System Modeling and Analysis: Foundations of System Performance Evaluation. Prent
U. Houston - COSC - 7397
Exploring Complex Networks S. H. Strogatz, Exploring complex networks, Nature, 1998Faloutsos3, On power-law relationship on the Internet topology, SIGCOMM, 1999 A. Lakhina et al, Sampling biases in IP topology measurement, INFOCOM, 200342Out
U. Houston - COSC - 6397
COSC 6397 Computer network system laboratory Instructor: Rong Zheng (PGH 565) TA: Song Wei (PGH 311) Time: Wed 4 7pm Location: SEC 205 Objectives: The main objective of the network system labs is to further the understanding of the network protocol
U. Houston - COSC - 7397
Simulating the Power Consumption of LargeScale Sensor Network ApplicationsVictor Shnayder, Mark Hempstead, Bor-rong Chen, Geoff Werner Allen and Matt Walsh-Divya RaoDept of Electrical and Computer Engineering University of HoustonWhat is PowerT
U. Houston - COSC - 6397
L i nux Basi csReadi ng:Chap 1-2 [WFR05] L i nux Command M anualAbout L i nux L i nux i s the name of the ker nel L i nux i s Open Sour ce Softwar e (OSS) L i nux i s l i censed thr ough the Gener al Publ i cL i cense (ver si on 2, aka GP
U. Houston - COSC - 6397
Network Programming with SocketsReading:Stevens 3rd ed., Ch. 3-6, or 2nd ed.Beej's Guide to Network Programming http:/beej.us/guide/bgnet/1OutlineBasic socket programming Concurrent communication Libnet and libcap library2Sockets process
U. Houston - COSC - 6377
C C OS 6377: C pute Ne om r tworksRong Zhe ng rzhe cs.uh.e ng@ duC pute Ne om r tworking: A Top Down Approach Fe aturing the I nte t, rne 3rd e dition. JimKurose Ke Ross , ith Addison-We y, July 2004. sleI ntroduction1-1I ntroduction Ove w o
U. Houston - COSC - 7397
Opportunistic Multi-Hop Routing for Wireless Networks Sanjit Biswas and Robert Morris M.I.T. Computer Science and Artificial Intelligence LabIntroduction Motivation Background Basic Idea of how ExOR works Why ExOR works ? Design Challenges Re
U. Houston - COSC - 7397
Song WeiEnabling Distributed Throughput Maximization in Wireless Mesh Networks A Partitioning Approach ProblemChannel Scheduling- -Centralized Distributed ModelGraph theory- -Conflict graph Graph coloringThroughput Con
U. Houston - COSC - 7397
Paper CritiqueJoseph Jefferson COSC7397 January 30, 2007"Routing in Multi-Radio, Multi-Hop Wireless Mesh Networks", Draves, R.,Padhye, J., Zill, B The authors of this paper attempt to address the problem of lost capacity in wireless mesh networks.
U. Houston - COSC - 6397
Libpcap and Libnet1Why Libnet & Libpcap?Allow manipulation/interception of link layer packetsUsing socket programming, kernel will fill in the source IP address, checksum etc.Raw socket is one way to write IP packets directly but not everythin
U. Houston - COSC - 6397
Lecture 4: Wireless LAN & IEEE 802.11 Wireless LAN Standard54Wireless LANsApplicationsLAN Extension Cross-building interconnect (e.g., Seattle Wireless) Nomadic Access Ad hoc networkingExample technologiesInfrared (IR) LANs Spread spectrum L
U. Houston - COSC - 7388
1/20/2009COSC7388 Advanced Distributed Computing- How to build reliable wireless healthcare systems?Rong ZhengOutlineCourse overview Ten commandments on technical presentation How to write critiques? Paper sign-up211/20/2009Technical
U. Houston - COSC - 6374
COSC 6374 Parallel ComputationDebugging MPI applicationsEdgar Gabriel Spring 2008Edgar GabrielHow to use a cluster A cluster usually consists of a front-end node and compute nodes Name of the front-end node: shark.cs.uh.edu You can login to
U. Houston - COSC - 6374
COSC 6374 Parallel Computation 1st Project AssignmentEdgar Gabriel Spring 2008Edgar GabrielAbout the Project A sequential code performing typical image analysis tasks Code provided by Shishir Shah Input file: a flat image ( no compression ) 1
U. Houston - CS - 6360
COSC 6360: Operating Systems MATERIALS ON THE SECOND SPRING 2009 MIDTERMYou are responsible for the materials discussed in class as they are summarized in the handouts and/or mentioned in the PowerPoint presentations. I expect you to understand thes
U. Houston - CS - 4330
COSC 4330 Fundamentals of Operating Systems Assignment #1: Process SchedulingNow due on Wednesday, October 22 at 11:59:59 PMObjective This assignment will introduce you to process scheduling. Specifications You are to simulate the execution of a s
U. Houston - CS - 6360
COSC 6360: Operating Systems PAPERS ON THE FALL 2008 FINAL You are only responsible for the materials discussed in class as they are summarized in the handouts and discussed in the PowerPoint slides. I expect you to understand these summaries and to
U. Houston - CS - 6360
COSC 6360: Operating Systems MATERIALS ON THE FIRST FALL 2008 MIDTERMYou are only responsible for the materials discussed in class as they are summarized in the handouts and discussed in the PowerPoint presentations. I expect you to understand these
U. Houston - CS - 4330
CHAPTER V INTERPROCESS SYNCHRONIZATION5.1 THE CRITICAL SECTION PROBLEM Whenever two or more processes share common data (which can be stored in a file, a magnetic tape or a shared memory segment), unpredictable results are likely to happen if two
U. Houston - CS - 4330
CHAPTER IV INTERPROCESS COMMUNICATION4.1 INTRODUCTION Multiprogramming provides us with the illusion that each process runs on its own CPU (pseudo-multitasking). We can utilize it in one of the following two ways: (a) (b) completely insulate proces
U. Houston - CS - 6375
COSC 6375: Computer System Performance Evaluation MATERIALS ON THE SPRING 2008 FINAL You are only responsible for the materials discussed in class as they are summarized in the PowerPoint presentations. 1. Review of probabilities You should review th
U. Houston - CS - 4330
CHAPTER VII MEMORY MANAGEMENT7.1 INTRODUCTION Main memory and CPU are the two most important resources of a computer. Although main memory has become and continue to become cheaper and more abundant, it seems that computer systems never have enoug
U. Houston - CS - 6360
Extensibility, Safety and Performance in the SPIN Operating SystemBrian Bershad, Stefan Savage, Przemyslaw Pardyak, Emin Gun Sirer, Marc E. Fiuczynski, David Becker, Craig Chambers, Susan Eggers Department of Computer Science and Engineering Univers
U. Houston - CS - 6375
Step # 1: Create folder and name it as your "firstName_lastName" Step # 2: Copy all your assignment related files in the folder Step # 3: Zip the folder Step # 4: Email zipped folder To: r4rasheed@yahoo.com Subject : COSC6375 firstName lastName Submi
U. Houston - CS - 6360
COSC 6360FINAL EXAMINATIONDECEMBER 13, 2004This exam is closed book. You can have two pages of notes. UH expels cheaters. 1. Which of the following statements are true or false (2 points) and why? (3 points) a) Coda servers are not stateless. T
U. Houston - CS - 6360
NAME: _KEY_ (FIRST NAME FIRST) SCORE: _ COSC 6360 FIRST MIDTERM SEPTEMBER 26, 2006THIS EXAM IS CLOSED BOOK. YOU CAN HAVE ONE SHEET (I.E., TWO PAGES) OF NOTES. PLEASE ANSWER EVERY PART OF EVERY QUESTION. THIS UNIVERSITY EXPELS CHEATERS. 1. Consider
U. Houston - CS - 4330
NAME: _ (FIRST NAME FIRST) SCORE: _COSC 4330FINAL EXAMINATIONDECEMBER 12, 2006THIS EXAM IS CLOSED BOOK. YOU CAN HAVE ONE PAGE OF NOTES. UH EXPELS CHEATERS.1. Complete the following sentences: (45 points) a) _Messages_ are an example of a con
U. Houston - CS - 4330
COSC 4330FINAL EXAMINATIONMAY 11, 2005This exam is closed book. You can have one page of notes. UH expels cheaters.1. Wolves and Sheep: A park ranger has to manage an area that can contain either wolves or sheep, but not both at the same time
U. Houston - CS - 6360
COSC 6360FIRST MIDTERMFEBRUARY 12, 2003This exam is closed book. You can have one sheet (i.e., two pages) of notes. Please answer every part of every question 1. Match each of the following UNIX features with the function it performs: (102 poin
U. Houston - CS - 6360
COSC 6360MIDTERMFEBRUARY 27, 2002This exam is closed book. You can have one sheet (i.e., two pages) of notes. Please answer every part of every question 1. Explain how you could use an exokernel to support multiple user interfaces on the same m
U. Houston - CS - 6360
UNIVERSITY OF HOUSTON Department of Computer Science COSC 6360-Operating Systems FINAL PART I December 12, 1989Be concise but complete. The exami
U. Houston - CS - 6360
UNIVERSITY OF HOUSTON Department of Computer Science COSC 6360-Operating Systems MIDTERM EXAMINATION March 8, 1
U. Houston - CS - 6360
UNIVERSITY OF HOUSTON Department of Computer Science COSC 6360-Operating Systems MIDTERM April 2, 1992Be concise but complete.1. W
U. Houston - CS - 6375
g+ -DCPP $* /usr/lib/libcsimcpp.a -lm
U. Houston - CS - 6360
UNIVERSITY OF HOUSTON Department of Computer Science COSC 6360: Operating Systems FINAL EXAMINATION Part I: General Questions QUALIFYING EXAMINATION
U. Houston - CS - 6360
UNIVERSITY OF HOUSTON Department of Computer Science COSC 6360-Operating Systems QUALIFYING EXAMINATION Graduate Part
U. Houston - CS - 6360
UNIVERSITY OF HOUSTON Department of Computer Science COSC 6360-Operating Systems MIDTERM EXAMINATION March 28, 1
U. Houston - CS - 6360
UNIVERSITY OF HOUSTON Department of Computer Science COSC 6360: Operating Systems MIDTERM March 21, 1991CLOSED BOOK. You may have wit
U. Houston - CS - 6360
COSC 6360MIDTERMOCTOBER 23, 2002This exam is closed book. You can have one sheet of notes. Cheaters will be expelled from UH. Answers that are not specific to the question being asked will not be read. 1. Spring treats the thread issuing a cros
U. Houston - CS - 4330
CHAPTER III SCHEDULING3.1 INTRODUCTION The scheduler is the part of the operating system that decides how to allocate the CPU and the main memory to the processes. a) The CPU scheduler decides which process should get the CPU; it is also called sho
U. Houston - CS - 4330
COSC 4330FINALDECEMBER 18, 2002This exam is closed book. You can have one page of notes. UH expels cheaters.1. True or False: (102 points; no penalty for incorrect answers) T _ F X_ T _ F X_ T _ F X_ T X_ F _ T X_ F _ T X_ F _ T _ F X_ T X_ F