Affiliation: | 1. Department of Industrial Management , National Taiwan University of Science and Technology , No. 43, Sec. 4, Keelung Road, Taipei, 106, Taiwan, Republic of China kjwang@mail.ntust.edu.tw;3. Department of Business Management , National Dong Hwa University , Hualien, 974, Taiwan, Republic of China;4. Department of Industrial Engineering , Chung-Yuan Christian University , Taiwan, Republic of China |