1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., 181 Chatham Rd. South, Hung Hom, Kowloon, Hong Kong SAR.
2. Assistant Professor, Institute of Human Resource Management, National Sun Yat-Sen Univ., 70 Lienhai Rd., Kaohsiung 80424, Taiwan.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ. ZS944, 9/F, Block Z, 181 Chatham Rd. South, Hung Hom, Kowloon, Hong Kong SAR (corresponding author).
4. Associate Professor, Dept. of Industrial Management and Information, Southern Taiwan Univ. of Science and Technology, 1 Nan-Tai St., Yongkang District, Tainan 71005, Taiwan.