1. Assistant Professor, Dept. of Architectural Engineering, Pennsylvania State Univ., 224 Engineering Unit A, University Park, PA 16802.
2. Assistant Professor, Dept. of Architectural Engineering, Ajou Univ., 206, World cup-ro, Suwon-si, Gyeonggi-do 16499, South Korea.
3. 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).