TY - JOUR T1 - Assisting tutors at the Hellenic Open University in the processes of designing, planning, managing and reusing learning activities JF - Proceedings of the 2009 European LAMS & Learning Design Conference Y1 - 2009 A1 - Christos J. Pierrakeas A1 - Papadakis, Spyros A1 - Xenos, Michalis ER - TY - JOUR T1 - Intelligently Raising Academic Performance Alerts JF - 1st International Workshop on Combinations of Intelligent Methods and Applications (CIMA), 18th European Conference on Artificial Intelligence, Patras, Greece Y1 - 2008 A1 - Kalles, Dimitris A1 - Christos J. Pierrakeas A1 - Xenos, Michalis ER - TY - JOUR T1 - Cryptographically secured communication between tutors of the Computer Science course of the Hellenic Open University: Experiences from the introductory module ‘Introduction to Computer Science’(in Greek) JF - HELLENIC OPEN UNIVERSITY JOURNAL OF INFORMATICS Y1 - 2007 A1 - Stamatiou, Yiannis A1 - Christos J. Pierrakeas A1 - Xenos, Michalis VL - 1 ER - TY - CHAP T1 - On small data sets revealing big differences T2 - Advances in Artificial Intelligence Y1 - 2006 A1 - Hadzilacos, Thanasis A1 - Kalles, Dimitris A1 - Christos J. Pierrakeas A1 - Xenos, Michalis JF - Advances in Artificial Intelligence PB - Springer ER - TY - JOUR T1 - Assessing the quality of web sites used in higher open distance education courses JF - Education, Communication & Information Y1 - 2004 A1 - Xenos, Michalis A1 - Dermitzioti, Evgenia A1 - Christos J. Pierrakeas PB - Taylor & Francis VL - 4 ER - TY - JOUR T1 - Evaluating and improving educational material and tutoring aspects of distance learning systems JF - Studies in Educational Evaluation Y1 - 2003 A1 - Christos J. Pierrakeas A1 - Xenos, Michalis A1 - Pintelas, Panayiotis PB - Pergamon VL - 29 ER - TY - JOUR T1 - A survey on student dropout rates and dropout causes concerning the students in the Course of Informatics of the Hellenic Open University JF - Computers & Education Y1 - 2002 A1 - Xenos, Michalis A1 - Christos J. Pierrakeas A1 - Pintelas, Panagiotis PB - Elsevier VL - 39 ER -