1. CIRTIBS Research Centre; University of Naples Federico II; Naples 80125 Italy
2. Department of Industrial and Information Engineering; University of Campania Luigi Vanvitelli; Aversa Caserta 81031 Italy
3. Department of Enterprise Engineering; University of Rome Tor Vergata; Rome 00133 Italy
4. Officine Meccaniche Irpine S.r.L., Area Industriale Calaggio; Lacedonia (AV) 83046 Italy