1. Department of Industrial & Systems Engineering, Changwon National University, Changwon, Gyeongnam, 641-773, Korea,
2. Production Engineering Center, GM Daewoo Auto and Technology Co. Ltd., Changwon, Gyeongnam, 641-120, Korea
3. Department of Management Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Herbei, 050018, China