1. Ph.D. Candidate, School of Civil and Environmental Engineering, Yonsei Univ., Seoul 120749, South Korea.
2. Assistant Professor, School of Construction Engineering, Kyungil Univ., Gyeongbuk 712701, South Korea.
3. Professor, School of Civil and Environmental Engineering, Yonsei Univ., Seoul 120749, South Korea (corresponding author).
4. Associate Professor, Dept. of Decision Sciences, School of Business, George Washington Univ., Washington, DC 20052.