1. Assistant Professor, Dept. of Architectural and Urban Systems Engineering, Ewha Womans Univ., 52 Ewhayeodae-Gil, Seodaemun-Gu, Seoul 03760, Korea.
2. Ph.D. Candidate, Tishman Construction Management Program, Dept. of Civil and Environmental Engineering, Univ. of Michigan, 2350 Hayward St., Suite 1316 G.G. Brown Bldg., Ann Arbor, MI 48109.
3. Ph.D. Candidate, Dept. of Architecture and Architectural Engineering, Seoul National Univ., 1 Gwanak-ro, Suite 425 Bldg. #39, Gwanak-Gu, Seoul 08826, Korea.
4. Associate Professor, Tishman Construction Management Program, Dept. of Civil and Environmental Engineering, Univ. of Michigan, 2350 Hayward St., Suite 2340 G.G. Brown Bldg., Ann Arbor, MI 48109 (corresponding author).