1. Postdoctoral Researcher, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, Columbia, SC 29208.
2. Visiting Professor at the Univ. of South Carolina; and Professor, Dept. of General Engineering, Univ. of Puerto Rico at Mayagüez, Mayagüez 00680, Puerto Rico.
3. Mr. and Mrs. Irwin B. Kahn Professor, Associate Dean (International Programs and Continuing Education), College of Engineering and Computing, Univ. of South Carolina, SC 29208 (corresponding author).