1. Dept. of Industrial Engineering & Management, National Chiao Tung Univ., Hsinchu, TW, e-mail: wlpearn@mail.nctu.edu.tw; etmail310@gmail.com
2. Dept. of Information Management, Kainan Univ., Taoyuan, TW, (corresponding author) e-mail: yttai@mail.knu.edu.tw