1. Former Graduate Student, Dept. of Civil Engineering and School of Management, N.C. State Univ., 208 Mann Hall, 2501 Stinson Dr., Campus Box 7908, Raleigh, NC 27695-7908 (corresponding author). E-mail: doug.harper@pentagon.af.mil
2. Associate Professor, Dept. of Civil, Construction, and Environmental Engineering, N.C. State Univ., Raleigh, NC 27695-7908. E-mail: bernold@ncsu.edu