1. Assistant Professor, Dept. of Civil Engineering and Construction Management, California State Univ.—Northridge, Northridge, CA 91330.
2. Associate Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA 50011 (corresponding author).
3. Professor Emeritus, School of Civil and Environmental Engineering, Oklahoma State Univ. Stillwater, Stillwater, OK 74074.