1. Associate Professor, Dept. of Construction Engineering, National Taiwan Univ. of Science and Technology, 43, Sec. 4, Keelung Rd., Taipei 106, Taiwan (corresponding author). E-mail: hungming@mail.ntust.edu.tw
2. Ph.D. Candidate, Dept. of Construction Engineering, National Taiwan Univ. of Science and Technology, 43, Sec. 4, Keelung Rd., Taipei 106, Taiwan.