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This work was part of the PowerDB project at ETH Zurich that investigated large
database clusters and that was partly sponsored by Microsoft. Uwe R?¶hm currently
holds a position as lecturer in database systems at the School of Information Technologies
at the University of Sydney, Australia. He has research interests in database
clusters, freshness-aware caching, and database support for bioinformatics.
Timos Sellis received his degree in electrical engineering in 1982 from the National
Technical University of Athens (NTUA), Greece. In 1983 he received the MSc
from Harvard University and in 1986 the PhD from the University of California at
Berkeley. In 1986, Professor Sellis joined the Department of Computer Science of
the University of Maryland, College Park, and in 1992 the Computer Science Division
of NTUA, where he is currently a full professor. His research interests include
peer-to-peer database systems, data warehouses, the integration of Web and data-
326 About the Authors
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of
Idea Group Inc. is prohibited.
bases, and spatial database systems. He has published over 120 articles in journals
and conferences and has been an invited speaker in major international events.
Alkis Simitsis is a visiting lecturer at the University of Peloponnese.
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