1. Dept. of Industrial Engineering and Management, National Chin-Yi Univ. of Technology, No. 57, Sec. 2, Zhongshan Rd., Taiping Dist., Taichung 41170, TW, e-mail: kschen@ncut.edu.tw
2. Dept. of Leisure Industry Management, National Chin-Yi Univ. of Technology, No. 57, Sec. 2, Zhongshan Rd., Taiping Dist., Taichung 41170, TW (Corresponding author), e-mail: tien7845@gmail.com