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SUMMARY:Efficient Top-k Query Processing in Distributed Environments
DTSTART:20090518T131500
DTSTAMP:20260427T221306Z
UID:9f1b6c18bb21d1855ff2da53e49eda324e49d19583e1d9c05d24acf3
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Christos Doulkeridis\, Norwegian University of Science and
  Technology (NTNU)\nAbstract: Lately the advances in centralized database 
 management systems show a trend towards supporting rank-aware query operat
 ors\, such as top-k\, that enable users to retrieve only a limited set of 
 the most interesting data objects. A challenging problem is to support ran
 k-aware queries in highly distributed environments. In this talk\, I will 
 present a framework (named SPEERTO) for top-k query processing in large-sc
 ale super-peer networks\, under the assumption of horizontal data distribu
 tion over the peers. A key observation of this work is the applicability o
 f the skyline operator for efficiently routing top-k queries in a P2P syst
 ems. Relying on a thresholding scheme\, SPEERTO returns the exact results 
 progressively to the user\, while the number of queried super-peers and tr
 ansferred data is minimized. In addition\, I will present ongoing research
  on non-traditional top-k queries for centralized domains\, where the focu
 s is on the side of the producer rather than the consumer. \n\nShort Bio: 
 Christos Doulkeridis is a post-doctoral researcher under an "Alain Bensous
 san" fellowship in the Norwegian University of Science and Technology (NTN
 U) in the group of professor Kjetil Noervaag. In 2007 he concluded his PhD
  entitled "Organizing and Searching Data in Unstructured P2P Networks" in 
 the Department of Informatics\, Athens University of Economics and Busines
 s (AUEB)\, under the supervision of associate professor Michalis Vazirgian
 nis. Prior to this\, he received a Master of Science in Information System
 s at the Athens University of Economics and Business (AUEB\, 2003) and a D
 iploma from the department of Electrical Engineering at the National Techn
 ical University of Athens (NTUA\, 2001). His research interests include da
 ta \nmanagement in peer-to-peer systems\, distributed knowledge discovery\
 , mobile and context-aware computing\, web services and semi-structured da
 ta.
LOCATION:BC 229 https://plan.epfl.ch/?room==BC%20229
STATUS:CONFIRMED
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