Ioannis Stavrakakis, Professor
Advanced Networking Research (ANR)Group
Department of Informatics & Telecommunications,
University of Athens
http://www.di.uoa.gr/~ioannis/
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Place: FST 01, Wing E, Room 147.
Date: Thursday 13/10/2005
Time: 2-3pm
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Abstract: In the first part of the talk
we will try to highlight the increasing autonomicity of the
networking environment, emphasizing aspects and elements associated
with content distribution. A key factor shaping the new networking
landscape is the user- (now network element)-behavior and
its potentially unilateral decision to contribute or not to
the networking infrastructure. In the second part of the talk
we present work applicable to the aforementioned environment
by extending the commonly employed abstraction of a distributed
replication group - for studying the object placement problem
for the purpose of Internet content distribution - to the
case in which individual nodes act selfishly, i.e., cater
to the optimization of their individual local utilities. Our
main contribution is the derivation of equilibrium object
placement strategies that: (a) can guarantee improved local
utilities for all nodes concurrently as compared to the corresponding
local utilities under greedy local object placement; (b) do
not suffer from potential mistreatment problems, inherent
to centralized strategies that aim at optimizing the social
utility; (c) do not require complete information at all nodes.
We develop a baseline computationally efficient algorithm
for obtaining the aforementioned equilibrium strategies and
then extend it to improve its performance with respect to
fairness. Both algorithms are realizable in practice through
a distributed protocol that requires only limited exchange
of information. |
Ioannis Stavrakakis: Diploma in Electrical
Engineering, Aristotelian University of Thessaloniki, (Greece),
1983; Ph.D. in EE, University of Virginia (USA), 1988; assist.
Prof. in CSEE, University of Vermont (USA), 1988-1994; assoc.
prof. of ECE, Northeastern University, Boston (USA), 1994-1999;
assoc. prof. of Informatics and Telecommunications, University
of Athens (Greece), 1999-2002 and prof. since 2002. Teaching
and research interests are focused on resource allocation
protocols and traffic management for communication networks,
with recent emphasis on peer to peer, wireless, sensor and
ad hoc networking. His past research has been published in
over 130 scientific journals and conference proceedings and
was funded by NSF, DARPA, GTE, BBN and Motorola (USA) as well
as Greek and European Union (IST) Funding agencies. He has
served repeatedly in NSF and IST research proposal review
panels and involved in the organization of numerous conferences
sponsored by IEEE, ACM, ITC and IFIP societies. He is a senior
member of IEEE, a member of (and has served as an elected
officer for) the IEEE Technical Committee on Computer Communications
(TCCC) and the chairman of IFIP WG6.3. He has served as a
co-organizer of the 1996 International Teletraffic Congress
(ITC) Mini-Seminar, the organizer of the 1999 IFIP WG6.3 workshop,
a technical program co-chair for the IFIP Networking'2000,
EWC'04 and IFIP WiOpt'05 conferences, the Vice-General Chair
for Networking'2002 conference, the organizer of the COST-IST(EU)/NSF(USA)-sponsored
NeXtworking'03 and the Workshop on Autonomic Communications
(WAC2005). He is an associate editor for the IEEE/ACM transactions
on Networking, the ACM/Baltzer Wireless Networks Journal and
the Computer Networks Journals. |