1. a Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong E-mail: mmbshiu@polyu.edu.hk
2. b Department of Industrial Engineering, Texas A & M University, College Station, TX 77843, USA E-mail: apley@tamu.edu
3. c Department of Industrial Engineering, University of Wisconsin, Madison, Madison, WI 53706, USA E-mail: darek@engr.wisc.edu
4. d Department of Industrial and Operations Engineering, University of Michigan, Ann Arbor, MI 48109, USA E-mail: shihang@umich.edu