21. ARION: a scalable architecture for a digital library of scientific collections

22. ERATOSTHENES: design and architecture of an OLAP system

23. The opsis project: materialized views for data warehouses and the web

24. Quality-oriented optimization of the design of the global data warehouse

25. Distance-based queries in multidimensional data spaces using R-trees

26. Developing decision support tools for confronting seismic hazards

27. Action theories in temporal databases

28. Spatio-temporal SQL externsion

29. Integration of spatial descriptive statistical data and geographic information

30. Secure networking using mobile IP

31. Mobile management in DECT/IP netwok

32. A www system for wireless networks: design, implementation and performance assessment

33. A DECT-IP interworking for quality of service support

34. DIKTIOMA-NET LEARNING: a network multimedia application development for educational purpose

35. E.Learn: the greek learning management system

36. TeLoDe: towards creating an intelligent computer algebra system

37. An educational programming environment for novices

38. eEdu: a database-driven tool for online education material

39. Determining user authorization in distributed database systems

40. Structuring the commit tree for better performance of two phase commit processing