Nikitas A. Assimakopoulos Department of Informatics, University of Piraeus, 80, Karaoli & Dimitriou St., GR-18534, Piraeus, Greece E-mail: assinik@unipi.gr Nikitas A. Assimakopoulos is a Professor in the Department of Informatics at the University of Piraeus, Greece. His research interests include…