- Organizing Committee Member:
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- Steering Committee Member : 10th International ACM Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'11), collocated with ACM SIGMOD, Athens, Greece, June 12, 2011.
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- General Co-Chair [with Wang-Chien Lee (Univ. of Pennsylvania, USA)]: DMSS 2011 - The 8th International Workshop on Data Management for Sensor Systems (DMSS'11), collocated with VLDB'11, Westin, Seattle, WA, Aug. 29, 2011.
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- Poster Co-Chair [with Alexandros Labrinidis (Univ. of Pittsburgh, USA) and Vassilis Vassalos (AUEB, Greece)]: HDMS 2010 - 9th Hellenic Data Management Symposium, Ayia Napa, Cyprus, June 30th - July 3, 2010.
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- General Co-Chair [with Phillip B. Gibbons (Intel Labs Pittsburgh, USA)]: 9th International ACM Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'10), collocated with ACM SIGMOD, Indianapolis, Indiana, USA, June 6-11, 2010.
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- Contest Organization Chair: The 10th IEEE International Conference on Data Mining (ICDM'10), Sydney, Australia, December 13-17, 2010.
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- Program Committee Co-Chair [with Wang-Chien Lee (Penn State Univ., USA)]: The 7th International Workshop on Data Management for Sensor Networks (DMSN'10), collocated with VLDB'10, Singapore, Sept. 13, 2010.
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- Organizing Chair and Session Chair: 9th Helenic Data Management Symposium (HDMS'10), Ayia Napa, Cyprus, 2010.
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- Program Committee Co-Chair [with Vijay Kumar (Univ. of Missouri - Kansas City, USA) and Takahiro Hara (Osaka Univ, Japan)]: 11th International Conference on Mobile Data Management (MDM'10), Kansas City, Missouri, USA, May 23rd to May 26, 2010.
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- Program Committee Co-Chair [with Le Gruenwald (Univ. of Oklahoma , USA)]: 8th International ACM Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'09), collocated with ACM SIGMOD, Providence, Rhode Island, USA, ,June 29, 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, June 13, 2008.
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- Session Chair: Wireless Networks session, 12th IEEE International Conference on Mobile Data Management (MDM'11), 6-9 June, 2011, Luleå, Sweden.
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- Session Chair: Modeling and Programming Sensor Networks session, 4th
mathend000# 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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- The 2012 ACM SIGMOD International Conference on Management of Data (SIGMOD'12), Demo Track, Scottsdale, Arizona, USA, May 20, 2012 - May 25, 2012.
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- The European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML/PKDD'11), Athens, Greece, 5-9 September 2011.
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- The 17th Annual ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (ACM SIGKDD'11), San Diego, California, USA, August 2011.
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- 6th International Workshop on Using P2P, Grid and Agents for the Development of Content Networks (UPGRADE-CN'11), collocated with CCGrid 2011, Newport Beach, CA, USA, May 23-26 2011.
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- 1st Workshop on New Trends in Similarity Search (NTSS'11), collocated with the EDBT 2011 Conference, Uppsala, Sweden, March 21-25, 2011.
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- The 10th International ACM Workshop on Data Engineering for Wireless and Mobile Access (ACM MobiDE'11), collocated with ACM SIGMOD, Athens, Greece, June 12-16, 2010.
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- The 2011 International Conference on Collaboration Technologies and
Systems (CTS'11), Philadelphia, Pennsylvania, USA, May 23-27, 2011.
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- The 12th International Conference on Mobile Data Management (IEEE MDM'11), Luleå, Sweden, June 6th to June 9, proceedings by IEEE Computer Society, 2010.
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- IEEE 27th International Conference on Data Engineering (IEEE ICDE'11), Hannover, Germany, April 11-15, 2011.
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- 9th Hellenic Data Management Symposium (HDMS'10), Ayia Napa, Cyprus, June 30th - July 3, 2010.
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- IEEE 10th IEEE International Conference on Data Mining (IEEE ICDM'10), Sydney, Australia, December 13-17, 2010.
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- IEEE 19th The 19th ACM International Conference on Information and Knowledge Management (ACM CIKM'10), Domain Specific Data Management Track, Toronto, Canada, Oct 27-29, 2010.
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- The 9th International Conference on Ontologies, DataBases, and Applications of Semantics
(ODBASE'10), Crete, Greece, Oct 26 - 28, 2010.
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- IEEE 4th International Workshop on Sensor Network Technologies for the Information Explosion Era (SeNTIE'10), in conjunction with the Mobile Data Management Conference (IEEE MDM'10), Kansas City, Missouri, May 23-26, 2010.
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- 16th International Euro-Par Conference (Europar 2010), proceedings by Springer, Aug. 31st - Sep. 3, 2010, Ischia - Naples, Italy.
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- IEEE 5th International Workshop on Content Delivery Networks (CDN'10) in conjunction with the 10th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid'10), Melbourne, Australia 17-20 May, 2010.
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- IEEE's 9th International Conference on Information Technology and Applications in Biomedicine, November 5-7, 2009, Larnaca, Cyprus.
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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 3rd International Workshop on Sensor Network Technologies for the Information Explosion Era (SeNTIE'09), 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 25th International Conference on Data Engineering (IEEE ICDE'09), Demo Program, Shanghai, China, March 29 - April 4, 2009.
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- IEEE 8th International Conference on Data Mining (IEEE ICDM'08), 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'08), 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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- 2nd International Workshop on Peer-to-Peer Computing for Information Search (P2PSearch'08), 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 (ACM 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 (SeNTIE'08), 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 (IEEE 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 (ACM 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 (IEEE AINA'07), Internet Computing and Web Applications, Niagara Falls, Canada, 2007.
- Referee for Journals and Magazines:
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- ACM Transactions on Intelligent Systems and Technology (ACM TIST) Journal (since 2011) - 2 reviews
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- IEEE Transactions on Mobile Computing (IEEE TMC) Journal (since 2010) - 1 review
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- IEEE Transactions on Vehicular Technology (IEEE TVT) Journal (since 2010) - 1 review
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- IEEE Transactions on Computers (IEEE TC) Journal (since 2010) - 1 review
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- IEEE Transactions on Distributed and Parallel Systems (IEEE TPDS) Journal (since 2008) - 2 review
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- IEEE Transactions on Knowledge and Data Engineering (IEEE TKDE) Journal (since 2005) - 11 reviews
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- IEEE Transactions on Evolutionary Computation (IEEE TEC) Journal (since 2005) - 2 reviews
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- IEEE Internet Computing Magazine (IEEE IC) - Special Issue on Cloud Computing (since 2008) - 1 review
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- IEEE Network 2005 Magazine (since 2004) - 1 review
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- IEEE Communications Letters (since 2011) - 1 review
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- Springer's Very Large Databases (VLDB) Journal (since 2007) - 3 reviews
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- Springer's Distributed and Parallel Databases (DPAD) Journal (since 2008) - 2 reviews
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- Springer's Data Mining and Knowledge Discovery (DMKD) Journal (since 2005) - 1 review
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- Elsevier's Information Systems (InfoSys) Journal (since 2011) - 1 reviews
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- Elsevier's Ad hoc Networks (Adhoc) Journal (since 2005) - 3 reviews
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- Elsevier's Information Sciences (InfoSciences) 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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- Elsevier's Journal of Knowledge & Data Engineering (DKE) Journal (since 2010) - 1 review
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- Oxford's Computer Journal (since 2011) - 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 SIGMOD - Intl. Management of Data Conference, 2009.
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- ACM PAVLAD - First Intl. Workshop on Privacy and Anonymity for Very Large Datasets, with CIKM'2009, Hong Kong, China, 2009.
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- ACM Intl. Conference on Computing Frontiers, Ischia, Italy, 2009.
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- SAGT - 4th Intl. Symposium on Algorithmic Game Theory, Salerno - Amalfi Coast, Italy, 2011.
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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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- 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.
- Proposal Evaluator:
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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.
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- Proposal Evaluator, Senate Committee for the Basic Reseach Funding PRogram (BRFP), Athens University of Economics and Business, 2010.
- 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