1. Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia 1678, Cyprus
2. University of Limassol, CIIM Business School, Limassol 3020, Cyprus
3. ReSiTec AS, Setesdalsveien 110, Kristiansand 4617, Norway
4. Sintef Industry, Alfred Getz vei 2b, Trondheim 7034, Norway