1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Michigan, 2350 Hayward St., Room 1316, G.G. Brown Bldg., Ann Arbor, MI 48109.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Michigan, 2350 Hayward St., Room 2340, G.G. Brown Bldg., Ann Arbor, MI 48109 (corresponding author).
3. Emeritus Professor, College of Business, Univ. of Michigan-Dearborn, 19000 Hubbard Dr., Dearborn, MI 48128.