1. Research & Innovation Development, NetCompany-Intrasoft, Marousi, Greece
2. Dept. of Information Technology, The American College of Greece, Athens, Greece
3. School of Mechanical Engineering, National Technical University of Athens, Athens, Greece
4. Dept of Mechanical Engineering & Aeronautics, University of Patras, Rio, Greece
5. Dept of Statistics & Actuarial-Financial Mathematics, University of the Aegean, Samos, Greece