1. Ph.D. Candidate, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore, 639798.
2. Associate Professor, Dept. of Civil Engineering, National Taiwan Univ., Taipei, 10617 Taiwan (corresponding author).
3. Associate Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore, 639798.
4. Assistant Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore, 639798.
5. Professor, Management School, Shandong Univ., Jinan, Shandong Province, 250100, P.R. China.