- Organizing Committee Member:
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- Program Committee Co-Chair: 11th International Conference on Mobile Data Management (MDM'10), Kansas City, Missouri, USA, 2010.
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- Program Committee Co-Chair: 8th International ACM Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'09), collocated with ACM SIGMOD, Providence, Rhode Island, USA 2009.
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- Publicity Chair: 7th International ACM Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'08), collocated with ACM SIGMOD, Vancouver, Canada, 2008.
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- Session Chair: Modeling and Programming Sensor Networks session, 4th Intl. Workshop on Data Management for Sensor Networks (DMSN), in conjunction with the Very Large Data Base Conference, Vienna, Austria, September 2007.
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- Session Chair: Fault tolerance and Dependability session, CoreGRID Workshop on Grid Programming Models and P2P Systems Architecture (Coregrid), Heraklion, Crete, Greece, June 12-13, 2007.
- Program Committee Member:
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- ICPP's First International Workshop on Distributed XML Processing: Theory and Practice, in conjunction with the 38th International Conference on Parallel Processing (ICPP'09), September 22-25, 2009, Vienna, Austria.
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- VLDB's 6th International Workshop on Data Management for Sensor Networks, in conjunction with the Very Large Data Base Conference (VLDB'09), Lyon, France, August 2009.
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- IEEE International Workshop on Sensor Network Technologies for the Information Explosion Era (SeNTIE2009), in conjunction with the Mobile Data Management Conference (MDM'09), Taipei, Taiwan, May 18-21, 2009.
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- The 13th Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD-09), Bankong, Thailand, April 27th - April 30th 2009.
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- IEEE 11th International Conference on High Performance Computing and Communications (HPCC-09), Database Applications and Data Mining track, Korea University, Seoul, Korea, June 25-27, 2009.
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- IEEE 25th International Conference on Data Engineering (ICDE 2009), Demo Program, Shanghai, China, March 29 - April 4, 2009.
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- IEEE 8th International Conference on Data Mining (ICDM 2008), Pisa, Italy, December 15-19, 2008.
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- IEEE Future Generation Communication and Networking, International Workshop on Peer-to-Peer Computing for Information Search (P2PSearch 2008), Hainan Island, China, 2008.
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- VLDB's 5th International Workshop on Data Management for Sensor Networks, in conjunction with the Very Large Data Base Conference (VLDB'08), Auckland, New Zealand, August 2008.
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- IEEE 10th International Conference on High Performance Computing and Communications (HPCC-08), Database Applications and Data Mining track, Dalian, China, September 25-27, 2008.
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- 2nd International Workshop on Peer-to-Peer Computing for Information Search (P2PSearch 2008), in conjunction with FGCN 2008, Hainan Island, China, 2008.
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- ACM 7th International Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'08), in conjunction with the International Conference on Management of Data (SIGMOD'08), Vancouver, Canada, 2008.
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- IEEE International Workshop on Sensor Network Technologies for the Information Explosion Era (SeNTIE2008), in conjunction with the Mobile Data Management Conference (MDM'08), Beijing, China, April 2008.
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- IEEE International Conference on Sensor Networks, Ubiquitous, and Trustworthy Computing (SUTC'08), Taichung, Taiwan, June 2008.
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- IEEE 22st International Conference on Advanced Information Networking and Applications (AINA'08), Okinawa, Japan 2008.
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- VLDB's 4th International Workshop on Data Management for Sensor Networks, in conjunction with the Very Large Data Base Conference (VLDB'07), Vienna, Austria, September 2007.
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- ACM 6th International Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'07), in conjunction with the International Conference on Management of Data (SIGMOD'07), Beijing, China, 2007.
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- IEEE 21st International Conference on Advanced Information Networking and Applications (AINA'07), Internet Computing and Web Applications, Niagara Falls, Canada, 2007.
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- IEEE 2nd International Conference on Computer Engineering & Systems (ICCES'07), Cairo, Egypt, 2007.
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- The International Conference on Embedded Software and Systems (ICESS'05), Xi'an, China, 2005.
- Referee for Journals:
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- IEEE Internet Computing - Special Issue on Cloud Computing (since 2008) - 1 review
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- IEEE Transactions on Distributed and Parallel Systems (TPDS) Journal (since 2008) - 1 review
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- IEEE Transactions on Knowledge and Data Engineering (TKDE) Journal (since 2005) - 8 reviews
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- IEEE Transactions on Evolutionary Computation (TEC) Journal (since 2005) - 2 reviews
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- IEEE Network 2005 Magazine (since 2004) - 1 review
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- Springer's Very Large Databases (VLDB) Journal (since 2007) - 2 review
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- Springer's Distributed and Parallel Databases (DPDS) Journal (since 2008) - 1 review
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- Elsevier's Ad hoc Networks (Adhoc) Journal (since 2005) - 3 reviews
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- Elsevier's Information Sciences (InfoSys) Journal (since 2004) - 4 reviews
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- Elsevier's Computer Communications (ComCom) Journal (since 2006) - 5 reviews
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- Elsevier's Journal of Parallel and Distributed Computing (JPDC) Journal (since 2007) - 2 reviews
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- Elsevier's Journal of Systems and Software (JSS) Journal (since 2008) - 1 review
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- Springer's Data Mining and Knowledge Discovery (DMKD) Journal (since 2005) - 1 review
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- Acta's International Journal of Computers and Applications s- 1 review
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- Inderscience's International Journal of Communication Networks and Distributed Systems (IJCNDS), Special Issue on "Data Management in Ad Hoc and Sensor Networks for the Information Explosion Era - 1 review
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- Wiley's Wireless Communications and Mobile Computing (WCM) - 1 review
- Referee for Conferences/Symposiums (in addition to PC appointments):
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- ACM Intl. Conference on Computing Frontiers, Ischia, Italy, 2009.
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- IEEE MDM - Intl. Conference on Mobile Data Management, Tapei, Taiwan, 2009.
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- ACM SIGMOD - Intl. Management of Data Conference, 2008.
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- IEEE MDM - Intl. Conference on Mobile Data Management, Beijing, China, 2008.
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- EuroPar - 14th International Euro-Par Conference, 2008.
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- IEEE IPDPS - Intl. Parallel and Distributed Processing Symposium 2008.
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- ACM CIKM - Intl. Information and Knowledge Management Conference, 2007.
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- IEEE AINA - Intl. Conference on Advanced Information Networking and Applications, 2007.
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- HDMS - 6th Hellenic Data Management Symposium, 2007.
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- ACM CIKM - Intl. Information and Knowledge Management Conference, 2006.
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- IADIS - Applied Computing 2006.
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- HPCC - Intl. High Performance Computing and Communications Conference, 2006.
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- OPODIS - Intl. Principles of Distributed Systems Conference, 2006.
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- ACM SIGMOD - Intl. Management of Data Conference, 2005.
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- ACM PODS - Intl. Principles of Database Systems Symposium, 2005.
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- IEEE ICPS - Intl. Pervasive Services Conference, 2005.
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- ACM SIGKDD - Intl. Knowledge Discovery and Data Mining Conference, 2005.
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- ACM GIS - Intl. Advances in Geographic Information Systems Symposium, 2005.
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- PAKDD - Pacific-Asia Conference on Knowledge Discovery and Data Mining, 2005.
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- ICESS - Intl. Embedded Software and Systems Conference, 2005.
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- VLDB - Very Large Data Bases Conference, 2004, 2009
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- ACM SAC - Intl. Applied Computing Symposium, 2004.
- External Referee for Workshops (in addition to PC appointments):
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- IEEE SME (MDM) - Intl. Workshop on Semantics in Mobile Environments, 2005.
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- ACM WebKDD (SIGKDD) - Intl. Workshop on Knowledge Discovery in the Web, 2005.
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- DBISP2P (VLDB) - Intl. Workshop on Databases, Information Systems, and Peer-to-Peer Computing, 2004.
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- DMSN (VLDB) - Intl. Workshop on Data Management for Sensor Networks, 2005.
- Referee for Research Programs:
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- Moderator/Reviewer for Milestone MJRA 1.3 (NA4), EU Enabling Grids for E-sciencE (EGEE), #IST-2003-508833, Information Society Technologies.
- Paper Review System Developer:
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- 5th International Conference Parallel Computing Technologies (PACT 1999), St. Petersburg, Russia, Springer Press, September 6-10, 1999.
- Memberships:
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- Member of ACM, Member of ACM SIGMOD, Member of IEEE, Member of USENIX
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- IEEE TCDE - Technical Committee on Data Engineering
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- IEEE TCI - Technical Committee on the Internet
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- IEEE TCDP - Technical Committee on Distributed Processing