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Sami Erol Gelenbe

Engineering educator , computer scientist

Sami Erol Gelenbe, Turkish computer scientist, engineering educator.


Gelenbe, Sami Erol was born on August 22, 1945 in Istanbul, Turkey. Arrived in France, 1972. Son of Ali Yusuf and Maria (Sacchet) Gelenbe.


Bachelor of Science in Electrical Engineering, Middle East Technology University, Turkey, 1966. Master of Science in Electrical Engineering, Polytechnic Institute Brooklyn, 1968. Doctor of Philosophy, Polytechnic Institute Brooklyn, 1969.

Doctor of Science, University Paris, 1973. Doctor of Engineering (honorary), University Rome, 1996. Doctor of Philosophy (honorary), Bogaziçi University, Istanbul, 2004.

Doctor of Science (honorary), University Liege, 2006.


Assistant professor University Michigan, Ann Arbor, 1970-1972. Professor University Liege, Belgium, 1972-1979, University Paris, since 1979. Scientific Director Inria, Rocquencourt, France, 1973—1982.

Science advisor Secretary State, Paris, 1984—1986. Chaired professor Duke University, 1993—1998. Associate dean engineering University Central Florida, 1998—2003, university chaired professor, 2001—2003.

Chair technical advisory board United States Army Simulation and Training Command, 1999—2003. Dennis Gabor chair Imperial College, London, 2003, head of intelligent system and networks, chaired professor, since 2003. Member science and technical board Defense Technology Center on Data and Information Fusion, Ministry of Defense United Kingdom, 2003—2009.


  • Achievements include numerous patents in field. Invention of first finite state models to predict the performance of memory paging algorithms, concurrently with W.F. King of International Business Machines Corporation. Invention of the random neural network and the G-network quencing model and obtained their analytical solutions.

    Invention of the cognitive packet network routing algorithms for computer networks. Proved that the FIFO paging algorithm is strictly equivalent to a random page replacement policy for the independent memory references establishing a hierarchy of memory management policies. Going from random to optimal and deriving their page fault ratios in explicit form.

    Derived first diffusion approximation for queuing systems using holding times at the boundries. Thus providing for better accuracy than conventional "reflecting boundary" diffusions at light traffic, and good accuracy at heavy traffic. Later applying it to the analysis of Asynchronous Transfer Mode cell traffic, leading to a patented call admission control protocol for air traffic management networks.

    Published the first performance analyses of window protocols in computer networks. Introduced new queueing network models with product form solutions called Gelenbe Networks. Developed the theory and application of Random Neural Networks.

    Designed and invented a Cognitive Packet Routing Algorithm for computer networks.


book Analysis and Synthesis of Computer Systems (Computer Science & Applied Mathematics) book Analysis And Synthesis Of Computer Systems (2Nd Edition): (Texts) (Volume 4) book Analysis and Synthesis of Computer Systems (Advances in Computer Science and Engineering: Texts) 2nd edition by Erol, Gelenbe (2010) Hardcover book [(Analysis and Synthesis of Computer Systems )] [Author: Erol Gelenbe] [Jun-2010] book Multiprocessor Performance (Wiley Series in Parallel Computing)


Advisory committee electrical United States Army, 1995, member technical advisory board army simulation and training command, 1999—2003. Fellow: Institution of Electrical Engineers, Association for Computing Machinery (ACM) (Signetrics award), Institute of Electrical and Electronics Engineers (review board France 1974-1982, member editorial board 1985-1993, Meritorious Service award 1989, 1992). Member: Hungarian Academy of Sciences (foreign member), French National Academy Engineering, Turkish Academy of Sciences, Academia Europaea, Eta Kappa Nu, Epsilon Pi Upsilon, Sigma Xi.


  • Other Interests

    History, bicycling.


Married Deniz Arman, June 8, 1968. 1 child, Pamir.

Ali Yusuf Gelenbe

Maria (Sacchet) Gelenbe

Deniz Arman

Pamir Gelenbe