1. Research Specialist, Construction Management and Economy Research Division, Dept. of Construction System Innovation Research, Korea Institute of Construction Technology, 1190 Simindae-Ro, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do 411-712, Republic of Korea.
2. Visiting Assistant Professor, Lyles School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-2051 (corresponding author).
3. Professor and Head, Construction Engineering and Management, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47906-2051.
4. Professor, Dept. of Civil and Environmental Engineering, Vanderbilt Univ., Nashville, TN 37235.