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SNC Seminar: Resource allocation in switched networks: Delay optimality and scal

Speaker: Prof. Yuan Zhong Columbia University
Time: 2013-12-20 11:00-2013-12-20 12:00
Venue: FIT 1-222


Modern processing systems, such as those that arise in manufacturing, information technology and other service industries, are becoming increasingly complex. Common to these systems is a large number of processing activities, coupled by resource constraints, and the key operational challenge is efficient and timely resource allocation.

We focus on a special but broad class of constrained queueing networks (switched networks) that faithfully capture the fine details of many processing systems. Examples include input-queued switches (the Internet router architecture), data centers, call centers and transportation networks. In this talk, we describe a class of online resource allocation policies, inspired by the classical insensitivity theory for product-form queueing networks, which admits explicit performance bounds. It also achieves optimal delay scaling in a heavy-traffic regime, for a broad class of switched networks, thus settling a long-standing conjecture on delay scaling in input-queued switches.

This is based on joint works with Devavrat Shah, John Tsitsiklis and Neil Walton.

Short Bio:

Yuan Zhong is currently an assistant professor in the IEOR Department at Columbia University. Before joining Columbia, he spent one year as a Postdoctoral Scholar in the Computer Science Department at UC Berkeley. He received a Ph.D in Operations Research from MIT in 2012, an M.A in Mathematics from Caltech in 2008, and a B.A. in mathematics from the University of Cambridge in 2006.

Yuan Zhong is broadly interested in the modeling and analysis of large-scale stochastic systems, with business and engineering applications in areas such as Communication Networks, Data Centers, Cloud Computing and Health Care. He is a recipient of the best student paper award at Sigmetrics in 2012.