1. Department of Industrial Engineering, Università degli Studi di Padova, Padova, Italy
2. CRF, University of Padova, Italy
3. Department of Industrial and Information Engineering and Economics, University of L'Aquila, Italy
4. Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
5. Consorzio RFX CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Padova, Italy