1. e-mail:
2. Engineering Simulation and Aerospace
Computing (ESAC), Northwestern Polytechnical University, P.O. Box 552, Xi'an, Shaanxi 710072, China
3. Department of Industrial Engineering, University of Parma, Parco Area delle Scienze, 181/A, Parma 43124, Italy e-mail:
4. Department of Industrial Engineering, University of Bologna, Viale Risorgimento 2, Bologna 40136, Italy