1. Assistant Professor, Construction Engineering and Management Division, Charles Durham School of Architectural Engineering and Construction, Univ. of Nebraska-Lincoln, W145 Nebraska Hall, Lincoln, NE 68588; formerly, Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL 61801.
2. Assistant Professor, Univ. of Michigan, Dept. of Civil and Environmental Engineering, 2350 Hayward St., Room 2340 G.G. Brown Bldg., Ann Arbor, MI 48109 (corresponding author).