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Evento: 'Palestra da Profa. Katia Obraczka no PESC'

Eventos PESC (Palestras, Seminários, etc.)
Palestras, Seminários, etc. do PESC/COPPE/UFRJ.
Data: Friday, August 26, 2011 At 12:00
Duração: 2 Horas

A Professora Katia Obraczka, da University of California at Santa Cruz estará visitando o PESC na próxima sexta-feira (26/8), quando irá também ministrar uma palestra, cujo titulo e resumo encontram-se a seguir.

******* Dados de interesse *******

Data: 6ª feira, 26/8

Horário: 11:00 h -- 12:00 h

Local: Centro de Tecnologia, Bloco H -- Sala H-324 B


Titulo: "A Machine Learning Approach to End-to-End Round-Trip Time Estimation and Its Applications to TCP"

Resumo: This talk presents a novel approach to end-to-end round-trip time (RTT) estimation using a machine-learning technique known as the Experts Framework. In our approach, each of several “experts” guesses a fixed value. The weighted average of these guesses estimates the RTT, with the weights updated after every RTT measurement based on the difference between the estimated and actual RTT. Through extensive simulations we show that the proposed machine-learning algorithm adapts very quickly to changes in the RTT. Our results show a considerable reduction in the number of retransmitted packets and an increase in goodput, in particular on more heavily congested scenarios. We corroborate our results through “live” experiments using an implementation of the proposed algorithm in the Linux kernel. These experiments confirm the higher accuracy of the machine learning approach with more than 40 improvement, not only over the standard TCP, but also over the well known Eifel RTT estimator.

Bio: Katia Obraczka is Professor of Computer Engineering at UC Santa Cruz. Before joining UCSC, she held a reserach scientist position at USC's Information Sciences Institute and a joint appointment at USC's Computer Science Department. Her research interests span the areas of computer networks, distributed systems, and Internet information systems.

She is the director of the Internetwork Research Group (i-NRG) at UCSC and has been a PI and a co-PI in a number of projects sponsored by government agencies (NSF, DARPA, NASA, ARO, DoE, AFOSR) as well as industry. Prof. Obraczka has edited one book, wrote a number of book chapters, and published over 200 technical papers in journals and conferences. She is co-recipient of the Best Paper Award at IFIP Networking 2007 for the paper "On-Demand Routing in Disrupted Environments". She is also co-recipient of one of three Best Paper Awards at IEEE MASS 2007 for the paper "DYNAMMA: A DYNAmic Multi-channel Medium Access Framework for Wireless Ad Hoc Networks".

She has served on the Editorial Board of the Elsevier Ad Hoc Networks Journal. She has been involved with the organization of several technical conferences in her area including IEEE Global Internet, IEEE SECON, IEEE MASS, ACM Mobicom, and ACM Mobihoc, IEEE NetSciCom. She received the USC ISI's Meritorious Service Award in 1999. She is a senior member of the IEEE.


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