Advances in Artificial Intelligence: Theories, Models, and Applications : 6th Hellenic Conference on AI, SETN 2010, Athens, Greece, May 4-7, 2010. Proceedings - Stasinos Konstantopoulos, Stavros Perantonis, Vangelis Karkaletsis, Constantine D. Spyropoulos, George Vouros ((Lecture Notes in Computer Science))