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Network Research at CDM

Dr. James Yu, an associate professor at CDM, specializes in wireless security, VoIP traffic engineering, network management, and fault-tolerant network design. His research includes empirical frameworks, theoretical models, data analysis, and comparative studies.

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Network Research at CDM

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  1. Network Research at CDM James Yu, Ph.D. Associate Professor School of Computing jyu@cdm.depaul.edu CSC426

  2. James Yu, Ph.D. • Ph.D. in Computer Science from Purdue University, 1985 • [Distinguished] Member of Technical Staff, Bell Labs, Lucent Technologies, 1985 – 2000 • Director of Network Technologies, ARBROS Communications, 2000 – 2001 • Assistant/Associate Professor, DePaul University, 2002 - now CSC426

  3. Research Interests • Wireless Security • VoIP Traffic Engineering • Network Management • Fault Tolerant Network Design • Network education: hands-on exercises for distance learning students CSC426

  4. Framework of Network Research (I) Problem Statement Empirical Framework Theoretical Model References Solutions to The problem Revision Data Analysis Comparative Study Conclusion CSC426

  5. Framework of Network Research (II) Problem Statement Solutions to The problem Theoretical Model Empirical Framework Data Analysis Data Analysis Comparative Study Your solution must be theoretical sound along with empirical support. Conclusion CSC426

  6. Problem Statement • Is the problem significant and interesting? • References, References, References • Can you describe the problem in one or two sentences? • Can you describe the problems with numbers? • Is the problem solvable? • Is the problem already solved? • Do not confuse the problem with the solution. CSC426

  7. Measurement • “When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the state of Science, whatever the matter may be." [Lord Kelvin, PLA, vol. 1, "Electrical Units of Measurement", 1883-05-03] CSC426

  8. Dependent Variable(s) vs.Independent Variables Y = F (X1, X2, X3, …..) CSC426

  9. Review of Research Paper • 1-2 page of each paper you read • Problem Statement • Results and Major Conclusions • Research Methodology (empirical or theoretical) • Comparison with other research work • Your assessment • Can you reproduce the research results? • Can you improve the research results? CSC426

  10. Network Research Projects CSC426

  11. Network: the BIG Picture PSTN NNI Network Services and Management Internet Switched Network Access Network Security Layer Transport Network ISP Network UNI carrier network Security Layer Security Layer Data LAN Voice Network 2G/3G Network Data Center Call Center cellular network converged enterprise network CSC426

  12. Project I: Performance Analysis Key measurement: throughput (bps) and delay (ms or s) Ethernet Switch IP Router Linux Bridge/Router Windows Bridge/Router CSC426

  13. Switch Performance Comparisonon Gigabit Ethernet Question: could you develop a problem statement from this chart? CSC426

  14. Wireless Performance Question: why is TCP performance is only 50% of the line rate for wireless communications? CSC426

  15. Project II: Wireless Denial of Service (DoS) Research CSC426

  16. TCP performance under DoS Stop Start CSC426

  17. SS7 SS7 IP (internal) IP (public) IP (private) Project III: VoIP Research PSTN Switch PSTN Switch SoftSwitch SoftSwitch Carrier VoIP Network Trunk MG Trunk MG Call Manager (SIP Proxy) Q.931 Access MG Call Manager (Enterprise) MG: Media Gateway CSC426

  18. VoIP: Traffic Engineering • Design the network with sufficient capacity to meet the traffic demand with satisfactory performance • Requirement: assurance of Voice Quality. • If call quality cannot be assured, reject the call request. • Demand (A) - Traffic Intensity number of calls × duration of average calls Erlang • Resources (N) – Network bandwidth (bps) and capacity (pps) • Grade of Service (GoS) – blocking probability CSC426

  19. Research Areas of VoIP • IP Multimedia Subsystem (IMS) • How is a VoIP call from one service provider to another service provider today? • VoIP Security • Voice Quality • Quality of Service (QoS) over internet and intranet • Supplemental and Intelligent Network (IN) services • API and VoXML CSC426

  20. Project IV: Fault Tolerant Network RSL RSTP (802.1w) VRRP Dual Homing ISP-01 ISP-02 • Network Design Goal: • No single point of failure • Failover time << 1 sec CSC426

  21. Project V: Remote Lab Access Linux Gateway Public Internet Private Networking Labs Windows Terminal Server Devices w/ Console interface Devices w/ IP interface Telecom Terminal Server Console interface Problem Statement: supporting distance learning students to perform hands-on network exercises from any place with 24×7 access to the network lab CSC426

  22. Research on Networking Education • Does the DL environment support the same learning goals effectively as the in-class students? • How do you define and measure the conformance to the learning goals and the effectiveness of the learning environment? • Does multiple choice questions measure the learning as effective as other methods? CSC426

  23. Project VI: Network Management Command-Oriented Vendor specific Variable-Oriented SNMP/MIB CORBA Object-Oriented Document-Oriented XML-Based Transaction-Oriented NETCONF DePaul University

  24. NETCONF • A new Protocol from IETF • It is designed to address many current issues of network mangement. • XML-based and Transaction-Based • The XML standard is well defined • The XML Schema allows flexible definition of the structured management information • download/upload of complete device configuration • human-readable • cost-effective to develop new applications and services • Integration with security infrastructure • Open issue – a lack of data models DePaul University

  25. Research Deliverables • No deliverables; no research • Publications, Publications, Publications • Journal Papers – only if accepted • Conference Papers • Technical Reports (little weight) • Grant proposals – only if awarded • Whitepapers? (does not count) • Tools, Demo, etc – good only if you have publications associated with them. CSC426

  26. Technical Writings • It is more important than your technical capabilities. Actually, it is a lot more important. • Take a technical writing course if you have never taken one. • use the DePaul Writing Labs • William Strunk Jr. the Element of Style • Yes, we are very picky (and extremely picky) CSC426

  27. Recommendations • There is no shortcut for research. • Your approach may not work. Actually, it is not likely to work most of the time, but do not give up. • You may find an elegant solution if you redefine the problem. Be flexible. • If this is your 1st or 2nd year, you may try to reproduce with minor refinement of others research work. • Be in a research team. If not, keep regular contact and discussion with other Ph.D. students. Build your community now (CSC426) • It is easier to publish at SoCRS and you should do it. CSC426

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