1. Department of Information Engineering, University of Brescia, Brescia, Italy
2. Department of Industrial Engineering, University of Salerno, Fisciano, Italy
3. Department of Mechanical Engineering, University of Colorado, Denver, CO, USA
4. Centre for Life-Cycle Engineering and Management, University of Cranfield, Bedford, U.K.
5. Department of Engineering, University of Sannio, Benevento, Italy
6. Mechanical Engineering and Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN, USA