1. Industrial Systems Institute,Research Centre ATHENA,Patras,Greece,26504
2. SISMA S.p.A.,via dell’Industria, 1 - 36013 Piovene Rocchette VI,Italy
3. Harokopio University of Athens,Department of Informatics and Telematics,Athens,Greece,17778
4. University of Patras,Department of Electrical and Computer Engineering,Patras,Greece,26504