1. Postdoctoral Fellow, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, Columbia, SC 29208.
2. Senior Staff Engineer, Schnabel Engineering, 11A Oak Branch Dr., Greensboro, NC 27407; formerly, Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, 300 Main St., Columbia, SC 29208.
3. Mr. and Mrs. Irwin B. Kahn Professor and Associate Dean, International Programs and Continuing Education, College of Engineering and Computing, Univ. of South Carolina, Columbia, SC 29208 (corresponding author).