Vassalos A. Vasilis

Associate Professor

Diploma in Electrical and Computer Engineering, National Technical University of Athens, 1994

(M. Sc. in Informatics, Stanford University, 1998

Ph.D. in Electrical Engineering, Stanford University, 2000




2 Troias Str., 4th floor, office 401


vassalos AT aueb gr


+30 210 8203 124

Office Hours: 


Research Interests: 

Databases, Web-based information systems and languages, and peer to peer data processing.

More specifically:

Integrating autonomous, heterogeneous information sources, with an emphasis on semi-structured information (such as XML), declarative languages and interfaces for semistructured data, and data processing techniques for peer to peer and acquisitional environments; exploiting the increased interoperability to significantly enhance eBusiness application development.


Doctoral Dissertation: "Querying Autonomous, Heterogeneous Information Sources," Computer Science Department, Stanford University, 2000
Master Thesis: "Buffer Size and Congestion Control in ATM Networks"; Diploma Thesis, National Technical University of Athens Technical Report, August 1994

Selected Publications: 

A. Deligiannakis, Y. Kotidis, V. Vassalos, V. Stoumpos, A. Delis, "Another Outlier Bites the Dust: Computing Meaningful Aggregates in Sensor Networks", accepted for publication in Proceedings of the 25nd International Conference on Data Engineering (ICDE'09), Shanghai, China, March 2009

M. Bornea, V. Vassalos, Y. Kotidis, A. Deligiannakis, "Double Index Nested-loop Reactive Join for Result Rate Optimization", accepted for publication in Proceedings of the 25nd International Conference on Data Engineering (ICDE'09), Shanghai, China, March 2009

D. Vassilakis, V. Vassalos, "An analysis of peer-to-peer networks with altruistic peers," Peer-to-Peer Networking and Applications, Springer (to appear, 2009)

V. Vassalos, "Answering queries using views", Encyclopedia of Database Systems, Springer Publishing, 2009 (in print)

H. Georgiadis and V. Vassalos, "XPath on Steroids: Exploiting Relational Engines for XPath Performance," Proceedings of 36th SIGMOD Conference, Beijing, China, June 2007

Selected Projects: 


Marie Curie Outgoing International Fellowship: "Query processing and Integration for Semistructured data: advancing the frontier"

"Multi-channel personalized delivery and mining of news content," PAVET program, in cooperation with financial news web site

"Next-generation systems for data and web services integration," PENED 2003 program

"Knowledge integration from distributed, heterogeneous sources," PYTHAGORAS II Programme

Other Activities: 


Member of the Minister's Committee for Telecommunications, Ministry for Transport and Communications

Member of the Technical Advisory Board, Lingospot, Los Angeles, CA

Numerous program committee memberships in international conferences, such as EDBT 2009, ICDE 2009, VLDB 2009.

Reviewer of many international journals, such as ACM TODS, ACM TOIS, IEEE Transactions on Knowledge and Data Engineering, VLDB Journal, and more.

Member of the W3C, 2000-2003

Member of the W3C XML Query Working group, 2000-2003 that resulted in the XQuery/XPath recommendations.