1. a Department of Industrial and Manufacturing Engineering, Rochester Institute of Technology (RIT), 81 Lomb Memorial Drive, Rochester, NY 14623-5603, USA
2. b Department of Industrial Engineering, Box 602050, Buffalo, NY 14260-2050, USA
3. c Department of Industrial Engineering, University of Miami, P.O. Box 248294, Coral Gables, FL 33124-0623, USA