David Raz  davidraz@post.tau.ac.il

Ph.D. Student and Teaching Assistant at the School of Computer Science in the Tel-Aviv University.

Advisors: Prof. Hanoch Levy and Prof. Benjamin Avi-Itzhak.

Major interests

1. Queuing Theory, especially Fairness measures
2. Cellular networks
3. Network resource allocation, specifically the use of LP

Current Research

Papers published

Queueing Fairness and Predictability

• "The Twin Measure for Queueing System Predictability", D. Raz, H. Levy and B. Avi-Itzhak, In Proceedings of Valuetools 2007 Second International Conference on Performance Evaluation Methodologies and Tools, Nantes, France, October 2007. [pdf]
  Extended Abstract as "On the Twin Measure and System Predictability and Farness" In Proceedings of MAMA' 06 The Eighth Workshop on MAthematical performance Modeling and Analysis, Saint-Malo, France, June 2006. Also appears as Performance Evaluation Review 34(3):15-17. [pdf]
  Abstract in Operations Research Society of Israel (ORSIS) Meeting, 2006, Nahariya, Israel, May 2006. [pdf]
  Presentation at MAMA 2006 [pps].
  Presentation at ORSIS 2006 [pps].
  Presentation at Networking Seminar 2006 [pps].
• "Quantifying Fairness in Queueing Systems: Principles, Approaches and Applicability", B. Avi-Itzhak, H. Levy. and D. Raz. To appear in Probability in the Engineering and Informational Sciences (PEIS). [pdf] [bibtex]
  Tutorial as "Principles of Fairness Quantification in Queueing Systems: A Tutorial", In Proceedings of 2nd International Working Conference on Performance Modelling and Evaluation of Heterogeneous Networks, HET-NETs ’04 pages 26-28 and T1/1-17, Ilkley, UK, July 2004. [pdf]
  Also abstract in Proceedings of 12th INFORMS/Applied Probability Society Conference, Bejing, China, June 2004. [pdf]
• “A Resource Allocation Queueing Fairness Measure: Properties and Bounds”, B. Avi-Itzhak, H. Levy and D. Raz, Queueing Systems Theory and Application 56(2):65-71, June 2007. [pdf] [bibtex]
• "Locality of Reference and the Use of Sojourn Time Variance for Measuring Queue Fairness", H. Levy, D. Raz and B. Avi-Itzhak. Operations Research Letters 35(3):311-318, May 2007. [pdf] [ps] [bibtex]
  Abstract in Operations Research Society of Israel (ORSIS) Meeting, 2005, Caesarea, Israel, May 2005. [pdf]
  Extended abstract in Proceedings of MAMA' 05 The Seventh Workshop on MAthematical performance Modeling and Analysis , Banff, Alberta, Canada, June 2005. Also appears as Performance Evaluation Review 33(2):39-41. [pdf]
  Presentation at MAMA 2005 [pps].
  Presentation at ORSIS 2005 [pps].
  Presentation at Eurandom visit 2005, with general RAQFM introduction [pps].
  Presentation at Networking Seminar 2006 [pps].
• "Fairness Considerations of Scheduling in Multi-Server and Multi-Queue Systems", D. Raz, B. Avi-Itzhak and H. Levy. In Proceedings of Valuetools First International Conference on Performance Evaluation Methodologies and Tools, Article 39, Pisa, Italy, October 2006. [pdf] [ps] [bibtex]
  Extended abstract (poster) In Proceedings of Sigmetrics 2005 Intranational Conference on Measurement and Modeling of Computer Systems pages 382-383, Banff, Alberta, Canada, June 2005. Also appears as Performance Evaluation Review 33(1):382-383. [pdf] [pps]
• "Class treatment in Queueing Systems: Discrimination and Fairness Aspects", D. Raz, B. Avi-Itzhak and H. Levy. Technical Report RRR-36-2005, RUTCOR, Rutgers University, November 2005. Submitted for publication. [pdf] [ps] [bibtex]
  Older version as "Classes, Priorities and Fairness in Queueing Systems", D. Raz, B. Avi-Itzhak and H. Levy. Technical Report RRR-21-2004, RUTCOR, Rutgers University, June 2004. [pdf] [ps]
  Extended abstract as "How Fair is Queue Prioritization?", D. Raz, B. Avi-Itzhak and H. Levy, Performance Evaluation Review 32(2):14-16, September 2004. [pdf]
  Presentation at the school's communication seminar [pps].
• "A Resource Allocation Queueing Fairness Measure", D. Raz, H. Levy and B. Avi-Itzhak. In Proceedings of Sigmetrics 2004/Performance 2004 Joint Conference on Measurement and Modeling of Computer Systems pages 130-141, New York, NY, June 2004. Also appears as Performance Evaluation Review 32(1):130-141. [pdf] [ps] [bibtex]
  Presentation at the school's communication seminar [pps].
  Presentation at SIGMETRICS/Performance'04 [pps].
  Also abstract in Operations Research Society of Israel (ORSIS) Meeting, 2004, Ashkelon, Israel, May 2004. [pdf]
  Also abstract as "How Fair is Your Queue", In Proceedings of 12th INFORMS/Applied Probability Society Conference, Bejing, China, June 2004. [pdf]

Resource Management

• "Optimal Assignment of Pre-cross-connected Trails to Shared-Backup Path-Protection Resources", M. Herzberg and D. Raz, submitted for publication. [pdf]
• "Resource Assignment in Multi-service Survivable Networks Based on the Cycle-oriented Approach", M. Herzberg and D. Raz, In Proceedings of The 19th International Teletraffic Congress (ITC19), Beijing, China, August 2005. [pdf]

Cellular Networks

• "Update and Search Schemes in Two-Dimensional Cellular Networks", M.Sc. Thesis, February 1997.

Network Analysis - Patents

• "Automatic Network Traffic Analysis", S. Azulai, R. Levy, Y, Cohen, A. Haiut, A. Stroh and D. Raz. United States Patent 6,137,782, October 2000.
• "Automatic Network Topology Analysis", S. Azulai, R. Levy, Y, Cohen, A. Haiut, A. Stroh and D. Raz. United States Patent 6,205,122, Match 2001.

Teaching

Current

None

Old

• Extended Introduction to Computer Science 0368.1105 (Fall 2006)
• Computer Networks 0368.3030 (Fall 2006)
• Workshop: Quality of Service on IP Networks 0368.3500 and Additional Materials
• Extended Introduction to Computer Science 0368.1105 (Spring 2005)
• Workshop: Quality of Service on IP Networks 0368.3500 (Spring 2005) and Additional Materials
• Extended Introduction to Computer Science 0368.1105 (Fall 2004)
• Extended Introduction to Computer Science 0368.1105 (spring 2004)
• Extended Introduction to Computer Science 0368.1105 (fall 2003)

Some Trivialities

• My Erdös Number is 4: Paul Erdös - Donald J. Newman - Alan G. Konheim - Hanoch Levy - Me (The Erdös Number Project).
• Academic geneology (unfinished)
• My bibtex file (everything I referenced until 29/11/2006).