Computer Science

University of Connecticut
Computer Science and Engineering


Lester Lipsky, Professor Emeritus


Computer Science and Engineering
The University of Connecticut U-155
Storrs, Connecticut 06269-2155

Phone: (860) 486-0662/3719
Fax: (860) 486-4817
Vita: (vitatum.pdf 138Kb)
email: lester@engr.uconn.edu

Education

Ph.D. Theoretical Atomic Physics, University of Connecticut, 1965
Physics, Brandeis University, 1956-1958
B.M.E Mechanical Engineering, City College of New York, 1956

Personal Information

Post-Doctoral Research Fellow, NRC-NSF, National Bureau of Standards, USA, 1965-1966
Research Associate, Royal Holloway College, University of London, UK, 1966-1968
Assistant, Associate, Full Professor, Department of Computer Science, University of Nebraska (Lincoln), 1968-1971-1976-1987.
Professor, Department of Computer Science and Engineering, University of Connecticut, 1987-2005, Emeritus since 2005.

Professor Lipsky teaches courses in Queueing Theory, Probabilistic Methods in Digital Systems, Probabilistic Performance of Computer Systems, and Automata Theory. He has a broad interest in atomic physics and various aspects of computer science including numerical analysis and computing theory. His specialty is computer network performance with special emphasis on Linear Algebraic Queueing Theory (LAQT).

Research Interests:


Books

"QUEUEING THEORY: A Linear Algebraic Approach", McMillan and Company, New York, 1992 (400pp).
"QUEUEING THEORY: A Linear Algebraic Approach, Second Edition", Springer-Verlag, New York, 2008 (550pp).
(Table of Contents for 2nd Edition, cont.pdf 46kb)

First three chapters of Second Edition:
(Chapter I: INTRODUCTION)
(Chapter II: M/M/1 QUEUE)
(Chapter III: MATRIX EXPONENTIAL FUNCTIONS)
Partial set of answers to Exercises:
(Last updated 27 May 2009, answer.pdf 240kb - more to come)

Publications and Reviewed Conference Proceedings Since 1989


"Analysis of Round-Robin Implementations of Processor Sharing, Including Overhead", Steve Thompson, Lester Lipsky, Sarah Tasneem and Feng Zhang, 8th IEEE International Symposium on Network Computing and Applications (IEEE NCA09), July 9-11 2009, Cambridge MA.
(nca09.pdf 106Kb)

``Comparison of Strategies for Serving Two Streams of Jobs," Feng Zhang, Lester Lipsky, Sarah Tasneem, and Steve Thompson, ISCA 24th Int. Conf. on Computers and Their Applications CATA 2009 April 8-10, 2009, New Orleans, Louisiana.
(AP_3151.pdf 132Kb)

``Performance Enhancement of Web Server Systems", Sarah Tasneem, Reda Ammar, Lester Lipsky, and Howard Sholl, ISCA 24th International Conf. on Computers and Their Applications, CATA 2009 April 8-10, 2009, New Orleans, Louisiana.
(cata2009sarah.pdf 143Kb)

``Analysis of Round-Robin Variants: Favoring Newly Arrived Jobs," Feng Zhang, Sarah Tasneem, Lester Lipsky and Steve Thompson, 42nd Annual Simulation Symposium (ANSS09), Society of Modeling and Simulation International (SCS), March 22-27, 2009, San Diego, California
(anss2009.pdf 102Kb)

``Asymptotic Behavior of Total Times for Jobs That Must Start Over if a Failure Occurs," Soren Asmussen, Pierre Fiorini, Lester Lipsky, Tomasz Rolski, and Robert Sheahan, MATHEMATICS OF OPERATIONS RESEARCH, November 2008 33: 932-944.

``Study of Bursty Internet Traffic," Kannikar Siriwong, Lester Lipsky and Reda Ammar, IEEE NCA07 July 2007, Cambridge, MA.
(nca07.pdf 188Kb)

``Performance-Revelant Network Traffic Correlation, "Hans-Peter Schwefel, Imad Antonios and Lester Lipsky, Proceedings of the 14th International Conference on Analytical and Stochastic Modeling Techniques and Applicationsi<\b> (ASMTA07), Prague, Czech Republic, June 2007. (pdf – 204KB)
(ASTMA_Final.pdf 204Kb)

``Performance Modeling of Memory Access Time for Systems with Hierarchical Memories" Marwan Sleiman, Lester Lipsky and Kishori Konwar, 5th IEEE International Symposium on Network Computing and Applications (IEEE NCA06), fast abstract session. August 2006, Cambridge MA.

``Simulation of Several Round-Robin Variants in M/G/1 Queues" Feng Zhang and Lester Lipsky, 2006 International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS06), Calgary, July 2006.
(rr06.pdf 126Kb)

``Modelling Restricted Processor Sharing" Feng Zhang and Lester Lipsky, Proc. of the 2006 International Conf. on Parallel and Distributed Processing Techniques and Applications (PDPTA06), Las Vegas, NV, June 2006.
(cmg07.pdf 126Kb) (pdp07_notes.pdf 146Kb)

``On The Completion Time Distribution for Tasks That Must Restart From The Beginning if a Failure Occurs" Pierre Fiorini, Robert Sheahan, Lester Lipsky, and Soren Asmussen, Proceedings of ACM Sigmetrics 8th Workshop on Mathematical Modeling and Analysis, France, June 2006.

``Dynamic Resource Allocation of Computer Clusters with Probabilistic Workloads" Marwan Sleiman, Lester Lipsky, and Robert Sheahan, Proceedings of the 20th IEE International Parallel \& Distributed Processing Symposium, April 25-29, 2006, Rhodes Island, Greece.

``Moments of Memory Access Time for Systems with Hierarchical Memories" Kishori Konwar, Lester Lipsky and Marwan Sleiman, 21st International Conference on Computers and Their Applications (CATA-2006), Seattle WA, March 2006.
(cache.pdf 214Kb)

``Fixed / Mobile Convergence from the User Perspective for New Generation of Broadband Communication Systems" F.H.P. Fitzek, Robert Sheahan, T. Kozlova Madsen, Lester Lipsky and R. Prasad, 2nd International Conference of the Center for Information and Communication Technologies (CICT) - Next Generation Broadband - Content and user perspectives, Copenhagen, Denmark, Dec, 2005

``On Unreliable Computing Systems when Heavy-Tails Appear as a Result of Recovery Procedures" Pierre Fiorini, Robert Sheahan and Lester Lipsky, ACM Sigmetrics Performance Evaluation Review, Vol. 33(2), September 2005.

``Multiple Hop Jitter Controlled Quality of Service with Measurement Based Admission Control" Cindy Siriwong, Lester Lipsky and Reda Ammar, The Twentieth International Conference on Computers and their Applications (ISCA2005). September 2005

``Using Residual Times To Meet Deadlines In M/G/C Queues" Sarah Tasneem, Lester Lipsky, Reda Ammar, and Howard Sholl, IEEE NCA05, Cambridge MA, August 2005.
(nca05sarah.pdf 195Kb)

``A Matrix Analytic Technique to Evaluate Unreliable Computing Systems when Heavy- Tails Appear as a Result of Recovery Procedures" Pierre Fiorini, Robert Sheahan and Lester Lipsky, Proceedings of ACM Sigmetrics 7th Workshop on Mathematical Modeling and Analysis, June 2005.

``Modelling Parallel and Distributed Systems With Finite Workloads," Ahmed M. Mohamed, Lester Lipsky and Reda Ammar, Journal of Performance Evaluation, Volume 60, , May 2005, pp 303-325.
(PerfEv04.pdf 481Kb)

``The Effect of Different Failure recovery Procedures On the Distribution Of Task Completion Times." Robert Sheahan, Lester Lipsky and Pierre Fiorini DPDNS05 Denver CO, April 2005
(dpdns05.pdf 213K)

``On the Relationship Between Packet Size and Router Performance for Heavy-Tailed Traffic." Imad Antonios and Lester Lipsky, The Third IEEE International Symposium on Network Computing and Applications (IEEE NCA04), Cambridge, MA, Sept, 2004
(nca04.pdf 600K)

``Analytic Performance Analysis for Parallel and Distributed Systems with Non-exponential Service Centers," (Ahmed M. Mohamed, Lester Lipsky and Reda Ammar), 17th ISCA International Conference on Parallel and Distributed Computing Systems (PDCS-04), San Francisco, CA, Sept 2004.

``Transient Performance Model for Parallel and Distributed Systems," (Ahmed M. Mohamed, Lester Lipsky and Reda Ammar), Proceedings of the 10th IEEE International Conference on Parallel and distributed Systems (ICPADS-04), Newport Beach, CA, July 7-10, 2004.
(ICPADS04.pdf 239Kb)

``Modelling Parallel and Distributed Systems with Finite Workloads," (Ahmed M. Mohamed, Lester Lipsky and Reda Ammar), Proceedings of the 9th IEEE Workshop on Fault-Tolerant Parallel, Distributed and Network-Centric Systems (FTPDS-04), Santa Fe, NM, April 26-30 2004
(FTPDS04.pdf 255Kb)

``Efficient Resource Allocation for Parallel and Distributed Systems," (Ahmed M. Mohamed, Lester Lipsky and Reda Ammar), WSEAS Transactions on Computers, Vol. 3, No. 5, pp. 1214-1219, April, 2004. (Also presented to the 4th WSEAS International Conference on Information Science, Communication and Applications (ISA-04), Miami, FL, April 2004)
(Wseas04.pdf 186Kb)

``Energy Levels and Classifications of Triply Excited States of N^4+, O^5+, F^6+ and Ne^7+,'' (M. J. Conneely and Lester Lipsky), Atomic Data and Nuclear Data Tables 86, January 2004

``Transient Model for Jackson Networks and its Approximation," (Lester Lipsky, Ahmed M. Mohamed and Reda Ammar), 7th International Conference on Principles of Distributed Systems (OPODIS03), December 10-13 2003, La Martinique, France.
(opodis03.pdf 229Kb)

``Efficient data Allocation for a Cluster of Workstations," (Ahmed M. Mohamed, Reda Ammar and Lester Lipsky) 16th International Conference on Parallel and Distributed Computing Systems (PDCS 2003), Reno, NV, August 10-13, 2003.
(pdcs03.pdf 83Kb)

``Availability Versus Performance," (Pierre Fiorini and Lester Lipsky), Computing International Scientific Journal, Vol 2, No. 1, June, 2003.

``Availability Versus Performance," (Pierre Fiorini and Lester Lipsky), The 2003 International Conference on Parallel and Distributed Processing Techniques and Applications, (IDAACS-2003) pp.1352-1357, Las Vegas, NV, June 23-26, 2003.

``Analytic Performance Model of P Fault-Prone Parallel Processors Running N Deterministically Distributed Tasks," (Lester Lipsky and Saira Kazmi), The 2003 International Conference on Parallel and Distributed Processing Techniques and Applications (IDAACS-2003), pp.1339-1345, Las Vegas, NV, June 23-26, 2003.

``Performance Model for a Cluster of Workstations," (Ahmed M. Mohamed, Lester Lipsky and Reda A. Ammar), The 4th International Conference on Communications in Computing (CIC-2003), pp. 227-233, Las Vegas, NV, June 23-26, 2003.
(cic03.pdf 68Kb)

``A Matrix Analytic Approach to Assess the Performance of Computing Systems Subject to Failure and Repair with non-Exponential Task Time Distributions," (Lester Lipsky, Robert W. Rowen and Pierre M. Fiorini), Proceedings of The 2003 International Conference on Parallel and Distributed Processing Techniques and Applications (IDAACS-2003), pp 1363-1369, Las Vegas, NV, June 23-26, 2003.

``A Performance Model and Analysis of Heterogeneous Traffic with Heavy Tails," (Imad Antonios and Lester Lipsky), The 2nd IEEE International Symposium on Network Computing and Applications (IEEE NCA03), pp.367-373, Cambridge, MA, April 2003.

``An Analytic Approach to Assess the Performability of Parallel and Distributed Systems," (P. M. Fiorini, Lester Lipsky and Colin. Campbell) 15th International Conference on Parallel and Distributed Computing Systems (PDCS 2002), Lousville, Ky, September 19-21, 2002.

``Theoretical and Experimental Results of Processing N Tasks in the Presence of Processor Failures," (Gehan Weeransinghe and Lester Lipsky), 15th International Conference on Parallel and Distributed Computing Systems (PDCS 2002), Lousville, Ky, September 19-21, 2002.
(pdcs02.ps 100Kb)

``Energy Levels and Classifications of Triply Excited States of Li, Be+, B++ and C+++,'' (M. J. Conneely and Lester Lipsky), Atomic Data and Nuclear Data Tables, September 2002
(adndt01.pdf 143Kb)

``A Performance Model for End-to-End User Delay in Telecommunications Systems With Self-Similar Traffic," (Imad Antonios and Lester Lipsky), 2002 International Symposium on Performance Evaluation of Computer and Telecommunication Systems, (SPECTS 2002), San Diego, CA, July 15-19, 2002.

``A Generalized Analytic Performance Model Of Distributed Systems That Perform N Tasks Using P Fault-Prone Processors," (Gehan Weeransinghe, Lester Lipsky and Imad Antonios), FTPDS-02, Fort Lauderdale, Fla, April 2002.
(ftpds02.pdf 228kb)

``A Distributed Fault-Tolerant Asynchronous Algorithm for Performing N Tasks," (Gehan Weerasinghe and Lester Lipsky), Special issue of INFORMATION: An International Journal, pp. 513-527, Vol.4, No.4 ,2001, (extended version of our paper in ISCA 16th International Conference on Computers and Their Applications, Seattle, Washington, USA, March 28-30, 2001).
(gehj01.pdf 266Kb)

``Comparison of The Analytic N-Burst Model with Other Approximations to Self-similar Telecommunications Traffic,'' Hans-Peter Schwefel, Lester Lipsky, Michael Greiner and Manfred Jobmann), IEEE NCA01 Symp. on Network Computing, Cambridge, MA. 10-12 October 2001 (rescheduled for February 11-13 2002), (preliminary version given at the 10th INFORMS Applied Probability Conference, Ulm, Germany, July 26-28 1999.)
(compfin.pdf 396Kb)

``An Analytic Performance Model Of Parallel Systems That Perform N tasks Using P Processors That Can Fail,'' Gehan Weerasinghe, Lester Lipsky and Imad Antonios, IEEE NCA01 Symp. on Network Computing, Cambridge, MA. 10-12 October 2001 (rescheduled for February 11-13 2002).
(nca01.pdf 139Kb)

``On the Necessity of Transient Performance Analysis in Telecommunication Networks," Hans-Peter Schwefel, Lester Lipsky and Manfred Jobmann, 17th International Teletraffic Congress (ITC17), Salvador da Bahia, Brazil, September 24-28 2001
(brazil.pdf 321Kb)

``Impact of Aggregated, Self-Similar ON/OFF traffic on Delay in Stationary Queueing Models (Extended Version)," (Hans-Peter Schwefel and Lester Lipsky), PERFORMANCE EVALUATION 43 , 203-221, May 2001.

``A Fault-Tolerant Asynchronous Algorithm for Performing N Tasks on a Cluster" (Gehan Weerasinghe and Lester Lipsky), ISCA 16th International Conference on Computers and Their Applications , Seattle, Washington, USA, March 28-30, 2001.

``Triply Excited States of the Lithium Isoelectronic Sequence: Z=3 to 10," (Micheal J. Conneely and Lester Lipsky), 2000 DAMOP , Storrs CT, June 14-17, 2000.

``Simulations With Heavy-Tailed Workloads," Chapter 3 of "Self-Similar Network Traffic and Performance Evaluation", (M. E. Crovella and Lester Lipsky), Wiley/Wiley-Interscience, 2000.
(See crovell@cs.bu.edu)

``Hollow States of Lithium,'' (Micheal J. Conneely and Lester Lipsky), PHYSICAL REVIEW A, 61 , February 2000.
(p98.pdf 208Kb)

``Impact of Aggregated Self-Similar ON/OFF Traffic on Delay in Stationary Queueing Models," (Hans-Peter Schwefel and Lester Lipsky), Proceedings of SPIE, Vol.3841 (Performance and Control of Network Systems III), Cambridge, USA, September 20, 21 1999.
(See Hans-Peter Schwefel's web page)

``Analytic Models of Transient Behavior for Servers with Self-Similar Traffic," (Hans-Peter Schwefel and Lester Lipsky), 10th INFORMS Applied Probability Conference, Ulm, Germany, July 26-28 1999

``Performance Results For Models of Traffic in Telecommunication Systems, Based on Multiple ON-OFF Sources With Self-Similar Behavior," (Hans-Peter Schwefel and Lester Lipsky), Teletraffic Engineering in a Competitive world, Vol 3A, P.Key and D. Smith, Eds., pp55-66, Elsevier Science B.V., 1999, also Proceedings for the 16th International Teletraffic Congress, Edinburgh, Scotland, June 7-11, 1999
(itc2.pdf 138Kb)

``Buffer Size Issues in the Presence of Self-Similar Traffic," (Hans-Peter Schwefel and Lester Lipsky), Third IFIP workshop on Traffic Management and Design of ATM Networks, London, April 26-27 1999.
(ifip99.pdf 50KB)

``Analytic Model of Performance in Telecommunication Systems, Based on ON-OFF Traffic Sources With Self-Similar Behavior," (Pierre Fiorini, Lester Lipsky and Hans-Peter Schwefel), 7th International Conference on Telecommunication Systems, Nashville, TN, March 18-21, 1999
(itc1.pdf 380Kb)

``The Importance of Power-Tail Distributions for Modeling Queueing Systems," (Michael Greiner, Lester Lipsky and Manfred Jobmann), OPERATIONS RESEARCH, 47 , No. 2, (March-April 1999).
(pow198.pdf 738kb)

``A Heavy-tailed ON/OFF Source Model with Applications to Network Capacity Planning,'' (P. M. Fiorini, Lester Lipsky and Yiping Ding), PDCS'98, September 1998
(fioding.pdf 225Kb)

``Long-Lasting Transient Conditions in Simulations with Heavy-Tailed Workloads, (Mark Crovella and Lester Lipsky), Proceedings of the 1997 Winter Simulation Conference (WSC-97), December 1997.
(crov1297.pdf 406kb) (See also crovell@cs.bu.edu)

``Consequence of Ignoring Self-Similar Data Traffic In Communications Modeling", (Pierre Fiorini, Lester Lipsky and Mark Crovella), Tenth International Conference on Parallel and Distributed Computing (PDCS-97), New Orleans, LA, October 1997.
(Related paper, sm5.pdf 98Kb)

``Comparison of Buffer Usage Utilizing Multiple Servers in Network Systems With Power-Tail Distributions," [Invited], (John Hatem, Lester Lipsky and Pierre Fiorini), INFORMS97, Boston MA, 30 June-2 July 1997.
(multa.pdf 94Kb)

``Tractable Queueing Paradigms for Modeling Telecommunications Systems with Self-similar Traffic," [Invited], (Pierre Fiorini and Lester Lipsky), INFORMS97, Boston MA, 30 June-2 July 1997.

``Buffer Problems in Telecommunications Networks," (John E. Hatem and Lester Lipsky), Fifth International Conference on Telecommunication Systems, Nashville, TN, March, 1997.
(buff.pdf 234Kb)

``Modelling Telecommunications Systems That Have Power-tail (Bursty, Chaotic, Heavy-Tail, Self-Similar, etc) Traffic," Invited Speaker, 22nd International Conference for the Resource management and Performance Evaluation of Computing Systems (CMG96), San Diego CA, December 1996.

``On The Performance of Parallel Computers: Order Statistics and Amdahl's Law, and Their Applications," (Lester Lipsky Tao Zhang and Yiping Ding) 22nd International Conference for the Resource Management and Performance Evaluation of Computing Systems (CMG96), San Diego CA, December 1996.

``On The Performance of Parallel Computers: Order Statistics and Amdahl's Law," (Lester Lipsky Tao Zhang and Seonglim Kang), International Journal Of Computers And Their Applications, Vol 3, #2, August 1996.
(amdl.pdf 76Kb)

``Steady-State Solution for Join-the-Shortest-Queue Policy in General Server Systems," (Seonglim Kang and Lester Lipsky), IASTED - International Conference on Modeling and Simulation, Pittsburgh, PA, May 1996.
(jsq96.pdf 175Kb)

``Configuration Mixings in Triply-Excited states in 3-Electron Systems," (Micheal J. Conneely and Lester Lipsky), XIX ICPEAC, Vancouver, BC, Canada, July 1995.

``Load Sharing in Dynamic Environments,'' (Seonglim Kang and Lester Lipsky) IASTED Secretariat PDCS'94 (IASM), Washington, D.C., October 1994.

``A Comparison of Three Switching Schemes In Isotropic Networks With Noisy Channels,'' (Aby Tehranipour and Lester Lipsky), IEEE Transactions On Communications, 41, pp. 782-792, (May 1993).

``A Model For The Probability Distribution of Medical Expenses'' (Walter Lowrie and Lester Lipsky), Proceedings of Conference Of Actuaries In Public Practice, (1993).

``Three-Electron Systems With Inner Shell Vacancies,'' (Micheal J. Conneely, Lester Lipsky and Arnold Russek), PHYSICAL REVIEW A, 46, 7, pp. 4012-4025 (October 1992).

``The Effect of Power-Tail Distributions on the Behavior of Time Sharing Computer Systems,'' (Lester Lipsky, Sharad Garg and Maryann Robbert), 1992 ACM SIGAPP Symposium on Applied Computing, Kansas City, MO, March, 1992.

``Approximations of the Mean Resequencing Waiting Time in M/G/C systems," (Yiping Ding, Lester Lipsky and Howard sholl), 1991 IEEE ??????????, 1991.

``The Generalized M/G/C//N-Queue as a Model for Time-Sharing Systems,'' (Aby Tehranipour and Lester Lipsky), ACM-IEEE Joint Symposium on Applied Computing, Fayetteville, AR, April, 1990.

``Signal Probabilities in AND-OR Trees,'' (Sharad Seth and Lester Lipsky), IEEE - Transactions On Computers, V-38, 11, pp. 1558-1563, November 1989.

``A Comparative Study of Switching Schemes in Isotropic Networks,'' (Aby Tehranipour, Lester Lipsky and I. Ieong), IEEE International Conference on Systems Engineering, August 1989.

``Residual Lifetimes as a Function of Queue Length for M/G/1//N Loops,'' (Lester Lipsky, Aby Tehranipour and Appie van de Liefvoort), Joint ACM-IEEE Workshop on Applied Computing '89, Stillwater, Oklahoma, March 1989.

Technical reports and Works in Progress

``Dynamic resource Allocation of Computer Clusters With Probabilistic Workloads," (Lester Lipsky, Robert Sheahan, Marwan Sleiman and Pierre Fiorini), Submitted to the NCA05. Cambridge MA, July 2005
(nca05.pdf 150Kb)

``Transient Model for Jackson Networks and its Application in Cluster Computing," (Lester Lipsky, Ahmed M. Mohamed and Reda Ammar), Submitted to the Journal of Cluster Computing.

``Performance Analysis of Distributed Systems that Perform N Tasks using P Fault-prone Processors, Without Repair," (Gehan Weerasinghe and Lester Lipsky), Technical Report, CSE/BRC July 2002.
(journal.pdf 1005Kb)

``How To Model Telecommunications (and Other) Systems Where Self-Similar (Power-Tail) Behavior is Observed: (Background Review and Research Proposal),'' (Lester Lipsky Michael Greiner, Mark Crovella, Wolfgang Klinger, Manfred Jobmann, Pierre Fiorini, and Hans-Peter Schwefel), Technical Report, CSE/BRC May, 1997.
(sum97.pdf 592Kb)

``Hypothesis Testing Using The `Chi-Squared' Test,'' Class Notes, 1996
(chi2.pdf 119Kb)

``Auto-Correlation of Lag-k For Customers Departing From Semi-Markov Processes,'' (Lester Lipsky, Pierre Fiorini, Wen-Jung Hsin and Appie van de Liefvoort), Technical Report, TUM, February 1995,
(corr+.pdf 256Kb)

``Transformation of the Kronecker Product of Identical Servers To A Reduced Product Space,'' (Lester Lipsky and Appie van de Liefvoort), Technical Report, TUM, December 1994,
(krpr.pdf 174Kb)

``A Comparison of Individual Shorter-Queue Selection With Globally More Optimal Systems: An Application of LAQT; (Sester Lipsky, Seonglim Kang, Tao Zhang and Brian Mackay), Technical Report BRC/CSE-TR-93-12 (1993).
(cheat.pdf 241Kb)

``N-Burst Processes as Analytic Models of Self-Similar Traffic in Telecommunication Systems, I-Background, and II-Specific System Models and Analytic Results,'' (Hans-Peter Schwefel and Lester Lipsky), In progress,
(With Technical University, Munich; Sponsored by Deutche Telecom)

Students' Theses

``Performance Based Cluster Architecture: Analytic Modelling and Analysis," by Ahmed Mostafa Abdel-Rahman Mohamed, PhD, Department of Computer Science and Engineering, University of Connecticut, June 2004.
(thesis.ahmed.pdf 1703Kb)

``Performance Modelling and Experimental Evaluation of Systems That Perform N Tasks Using P Fault-prone Processors in Parallel," by Don Moses Gehan Weerinsinghe, PhD, Department of Computer Science and Engineering, University of Connecticut, August 2002.
(thesis.gehan.pdf 1250Kb)

``Performance Analysis of Intermediate Systems Serving Aggregated ON/OFF Traffic with Long-Range Dependent Properties,'' by Hans-Peter Schwefel, School of Informatics, Technical University, Munich, Germany, September 2000.
Hans-Peter Schwefel

``Comparison Of Buffer Usage Utilizing Single And Multiple Servers In Network Systems With Power-tail Distributions.'' by John E! Hatem, PhD, Department of Computer Science, University of Connecticut, December 1997.
(thesis.hatem.pdf 534kb)

``On the Convergence of Sums of Power-Tail Samples To Their $\alpha$-Stable Distributions,'' by Wolfgang M. Klinger, MS, Department of Computer Science, University of Connecticut, August 1997.
(thesis.sam.pdf 493Kb)
(scape.pdf Hyp 593Kb)

``Modelling of Packet Arrivals Using Markov Modulated Poisson Processes With Power-Tail Distributions,'' by Hans-Peter Schwefel, Diplomarbeit, Faculty for Informatics, Technical University, Munich, Germany, September 1997.
(thesis.hansp.pdf 1457Kb),

``Modeling Telecommunication Systems with Self-Similar Data Traffic," by Pierre M. Fiorini, PhD, Department of Computer Science, University of Connecticut, May 1998,
(thesis.pierre.pdf 407kb)

Selected Recent Colloquia

"Comparison of Switching Schemes in Noisy Packet_Switching Networks," Computer Science and Telecommunications, University of Missouri-Kansas City, 13 September 1994.

"Dynamic scheduling of Queues," Department of Computer Science, University of Nebraska, 22 September 1994.

``Queueing Theory in Computer Science," Department of Computer Science, Regensburg Fachhochschule, Regensburg, Germany, 12 January 1995

``Power-Tail Distributions and Their Significance in the Behavior of Computer and Telecommunications Systems," Dipartimento di Ingegneria Elettronica, Universita' Degli Studi Di Napoli ``Federico II," Naples, Italy, 25 January 1995

``Power-Tail Distributions and Their Significance in the Behavior of Computer and Telecommunications Systems," Department of Systems and Networks, Siemens Corporation, München, Germany, 23 February 1995

``Power-Tail Distributions and Their Significance in the Behavior of Computer and Telecommunications Systems," Applied Probability Group, Dublin Institute for Advanced Studies, Dublin, Ireland, 15 April 1995.

``Power-Tail Distributions and Their Significance in the Behavior of Computer and Telecommunications Systems,"Facultät Für Informatik, Universät Der Bundeswehr München, München, Germany, 5 May 1995

``Power-Tail Distributions and Their Significance in the Behavior of Computer and Telecommunications Systems," Department of Computer Science and Engineering, University of Connecticut, Storrs, CT, 13 October 1995.

``Power-Tail Distributions and Their Significance in the Behavior of Computer and Telecommunications Systems," Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY, 1 February 1996.

``Power-Tail Renewal Processes as Models for `Self-Similar' Arrival Processes, and Their Significance for Telecommunications Systems" Department of Computer Science, Boston University, Boston, MA, 16 October 1996.

``Power-Tail Renewal Processes as Models for `Self-Similar' Arrival Processes, and Their Significance for Telecommunications Systems" Department of Computer Science, University of Nebraska, Lincoln, NE, 8 and 9 April 1997.

``Analytic Modelling of `Self-Similar' Traffic Using Power-Tail Distributions," Performance Modelling Group, AT\&T Labs, Holmdel, NJ, 22 September,1997.

``Power-Tail Distributions and Their Significance in the Behavior of Computer and Telecommunications Systems," Performance Modelling Group, BGS Systems, Waltham, Mass, 14 November 1997.

``Why Standard Models Don't Work For Telecommunications Systems, and an Analytic Method, The N-Burst Process, That Does," Department of Computer Science, Regensburg Fachhochschule, Regensburg, Germany, 10 June 1998.

``Why Standard Models Don't Work For Telecommunications Systems, and an Analytic Method, The N-Burst Process, That Does," Department of Computer Science, University of Versailles, Versailles, France, 22 September 1998.

``Why Standard Models Don't Work For Telecommunications Systems, and an Analytic Method, The N-Burst Process, That Does," Department of Computer Science, University of Bourgoyne, Dijon, France, 25 September 1998.


Hobbies

Listening to jazz and classical music, playing with my grandchildren, playing bridge and Spider, hiking
Temporary Material
(pdf encoded file)

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