1. Associate Professor, Dept. of Construction Engineering, National Kaohsiung First Univ. of Science and Tech., 1 University Rd., Yenchao, Kaohsiung 824, Taiwan, R.O.C. E-mail: roylo@ccms.nkfust.edu.tw
2. Assistant Professor, Dept. of Construction Engineering, National Kaohsiung First Univ. of Science and Tech., 1 University Rd., Yenchao, Kaohsiung 824, Taiwan. E-mail: ken@ccms.nkfust.edu.tw
3. Ph.D. Candidate, Institute of Engineering Science and Tech., National Kaohsiung First Univ. of Science and Tech., 1 University Rd., Yenchao, Kaohsiung 824, Taiwan. E-mail: u9015908@ccms.nkfust.edu.tw