When: Wednesday, 2017-04-12 at 14:00h
Where: COMSYS seminar room (E3, ground floor)
Title: Weaving with Stopping Times
Optimal engineering of computer and communication systems crucially depends on their analytical understanding under random input. However, a key characteristic of modern systems is that their input exhibits various forms of correlations, which cannot be well captured by most theories for performance analysis; moreover, resorting to approximations of real input with amenable models can be very misleading in terms of the systems' performance.
To better understand systems with correlated input, this talk introduces an elementary technique based on stopping times analysis. In a nutshell, stopping times are random times depending on the past only, and are natural representations of outstanding events in systems (e.g., the time of a QoS violation or the time when some requested object is not in some cache). The applicability of the proposed method will be illustrated with several classical examples, e.g., bandwidth dimensioning, admission control in wireless networks, or the design of cache algorithms.
Florin Ciucu was educated at the Faculty of Mathematics, University of Bucharest (Diploma in Informatics, 1998), George Mason University (M.Sc. in Computer Science, 2001), and University of Virginia (Ph.D. in Computer Science, 2007). Between 2007 and 2008 he was a Postdoctoral Fellow in the Electrical and Computer Engineering Department at the University of Toronto. Between 2008 and 2013 he was a Senior Research Scientist at Telekom Innovation Laboratories (T-Labs) and TU Berlin. Currently he is an Associate Professor in the CS department at the University of Warwick. His research interests are in the stochastic analysis of communication networks, resource allocation, and randomized algorithms. He has served on the Technical Program Committees of several conferences including IEEE Infocom, ACM Sigmetrics, IFIP Performance, ACM e-Energy, IEEE ICNP, or ACM Mobihoc; currently he is on the Editorial Board of the Performance Evaluation journal. Florin is a recipient of the ACM Sigmetrics 2005 Best Student Paper Award and IFIP Performance 2014 Best Paper Award.
Further info: www.dcs.warwick.ac.uk/~florin/
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