1. Ph.D. Candidate, Dept. of Construction Engineering, Chaoyang Univ. of Technology, 168, Jifeng E. Rd., Wufeng District, Taichung 41349, Taiwan.
2. Assiatant Professor, Dept. of Construction Engineering, Chaoyang Univ. of Technology, 168, Jifeng E. Rd., Wufeng District, Taichung 41349, Taiwan.
3. Associate Professor, Dept. of Civil Engineering, Feng Chia Univ., No. 100, Wenhwa Rd., Seatwen, Taichung 40724, Taiwan.