1. Postdoctoral Research Associate, Civil and Environmental Engineering Dept., Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801.
2. Senior Vice President, EQE International Incorporated, Oakland, CA 94607-5500.
3. Professor, Civil Engineering Dept., Stanford Univ., Stanford, CA 94305-4020.
4. Professor, Civil and Environmental Engineering Dept., Univ. of Illinois, Urbana, IL 61801.