This is mostly work on software infrastructures for networked communities, with an emphasis on e-commerce.
The research is described in the following papers:
D. Kalles, A. Papagelis and C. Zaroliagis. ”Algorithmic Aspects of Web Intelligent Systems”. Web Intelligence, N. Zhong, J. Liu and Y. Yao (eds), pp. 323-344, Springer, 2003.
D. Dadiotis, D. Kalles, E. Ntoutsi and A. Papagelis. “Scalable and interoperable e-commerce infrastructures: The Instant Commerce Server paradigm”, PC-Human Computer Interaction Conference, workshop on Transforming Web Surfers to E-Shoppers, Patras, Greece, December 2001.
C. Bouganis, D. Koukopoulos and D. Kalles. “A Real Time Auction System over the WWW”, Conference on Communication Networks and Distributed Systems Modeling and Simulation, San Francisco, USA, 1999.
There is also some prototype work on:
A mash-up approach to developing a community for spotters and seekers of stolen cars (developed by D. Regklis in 2008 for his M.Sc. dissertation).