1. 9/8/2015 CSC426 1 Network Research at CDM James Yu, Ph.D. Associate Professor School of Computing jyu@cdm.depaul.edu

2. 9/8/2015 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

3. 9/8/2015 CSC426 3 Research Interests Wireless Security VoIP Traffic Engineering Network Management Fault Tolerant Network Design Network education: hands-on exercises for distance learning students

4. 9/8/2015 CSC426 4 Framework of Network Research (I) Problem Statement Empirical Framework Theoretical Model Data Analysis Solutions to The problem References Comparative Study Conclusion Revision

5. 9/8/2015 CSC426 5 Framework of Network Research (II) Problem Statement Empirical Framework Theoretical Model Solutions to The problem Comparative Study Conclusion Data Analysis Your solution must be theoretical sound along with empirical support.

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. 9/8/2015 CSC426 6

7. Measurement 9/8/2015 CSC426 7 “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]

8. Dependent Variable(s) vs. Independent Variables 9/8/2015 CSC426 8 Y = F (X1, X2, X3, …..)

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? 9/8/2015 CSC426 9

10. NETWORK RESEARCH PROJECTS 9/8/2015 CSC426 10

11. 9/8/2015 CSC426 11 Transport Network Switched Network Services and Management Access Network Data Center Call Center Data LAN Voice Network 2G/3G Network ISP Network PSTN Internet carrier network converged enterprise network cellular network Security Layer Network: the BIG Picture Security Layer UNI NNI

12. 9/8/2015 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

13. 9/8/2015 CSC426 13 Switch Performance Comparison on Gigabit Ethernet Question: could you develop a problem statement from this chart?

14. 9/8/2015 CSC426 14 Wireless Performance Question: why is TCP performance is only 50% of the line rate for wireless communications?

15. 9/8/2015 CSC426 15 Project II: Wireless Denial of Service (DoS) Research

16. 9/8/2015 CSC426 16 TCP performance under DoS TCP performance under DoS Start Stop

17. 9/8/2015 CSC426 17 Project III: VoIP Research PSTN Switch SS7 IP (public) Trunk MG SoftSwitch SS7 IP (private)IP (internal) PSTN Switch Access MG Call Manager (SIP Proxy) SoftSwitch Call Manager (Enterprise) Trunk MG Q.931 MG: Media Gateway Carrier VoIP Network

18. 9/8/2015 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 Erlang Resources (N) – Network bandwidth (bps) and capacity (pps) Grade of Service (GoS) – blocking probability

19. 9/8/2015 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

20. 9/8/2015 CSC426 20 Project IV: Fault Tolerant Network ISP-01 ISP-02 Dual HomingVRRPRSTP (802.1w) RSL Network Design Goal: 1.No single point of failure 2.Failover time << 1 sec

21. 9/8/2015 CSC426 21 Project V: Remote Lab Access Public Internet Private Networking Labs Linux Gateway Windows Terminal Server Telecom Terminal Server Console interface Devices w/ IP interface Devices w/ 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

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? 9/8/2015 CSC426 22

23. Project VI: Network Management Command- Oriented Object-Oriented Document- Oriented Variable- Oriented Transaction- Oriented Vendor specif ic SNMP/MIB CORBA XML-Based NETCONF 04/27/09 23 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 04/27/09 24 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. 9/8/2015 CSC426 25

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) 9/8/2015 CSC426 26

27. 9/8/2015 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 1 st or 2 nd 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.