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Shmuel Zaks


Shmuel Zaks - Technion, Israel Institute of Technology (ISRAEL)

Shmuel Zaks received BSc (cum laude) and MSc in Mathematics from the Technion, Israel, in 1971 and 1972, and PhD in Computer Science from the University of Illinois at Urbana-Champaign, USA, in 1979. He then joined the Department of Computer Science at the Technion, where he is a Professor and the incumbent of the Joan Callner-Miller Chair in Computer Science. He has been a visiting profesor in many universities (including MIT, University of Rome "La Sapienza" and University of l'Aquila (Italy), University of Liverpool (UK), Hong Kong University of Science & Technology, Carleton University (Canada), and Universidad Rey Juan Carlos), and research centers (including IBM TJ Watson Research Center (USA), INRIA Sophia Antipolis (France) and Create-Net (Italy)).

He was on the program committees of over 30 conferences, co-chair of DISC 1992 and SIROCCO 2007, member of the steering committees of DISC and SIROCCO, chair of the steering committee of DISC, and on the editorial board of Information Processing Letters. Professor Zaks is the author of over 150 journal and conference papers. His research areas include Distributed Computing, Graph and Combinatorial Algorithms, Discrete Mathematics, and Theory of Networking (especially Optical Networks).


Project: In all-optical WDM (Wavelength Division Multiplexing) networks signals are sent through optical fibers using lightpaths that are assigned wavelength ranges. The Project focuses on systematically optimizing the utilization of regenerators (switching components that regenerate a signal after a certain distance) and ADMs (Add-Drop Multiplexers). The Project studies the currently used fixed-grid model (where fixed width ranges of the spectrum are assigned to the lightpaths) and the new flexible flex-grid model (in which these ranges can be of variable widths).

Different sub-spectra imply different transmission impairments (different distance needed between consecutive regenerators). We need to provide a given set of requests with routing, traffic grooming and wavelength assignment. We study off-line and on-line cases, ad-hoc (given one set of requests) and agile (given several such sets, and we need to satisfy each of them separately) cases.

The goal is to optimize the network performance in both the design and operational phases, under a variety of constraints. We investigate minimization (perform at a minimum cost) and maximization (satisfy maximum requests with bounded resources, or maximize the net profit of a network) problems, using a variety of algorithmic techniques.

Stay Period: MAR 13 - AUG 13


Lecturer: Dr. Shmuel Zaks
Title: Optimization in optical networks
Date: March 12 at 12:00h
Place: Aula de Grados del Edificio Padre Soler