1. Ph.D., Candidate, Civil Engineering Dept., Univ. of Kentucky, D151C Raymond Bldg., Lexington, KY 40506.
2. Associate Professor, Civil Engineering Dept., Univ. of Kentucky, C151C Raymond Bldg., Lexington, KY 40506.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, Waterloo ON, Canada N2L 3G1.
4. Research Scientist, The Ray Marshall Center for the Study of Human Resources, LBJ School of Public Affairs, The Univ. of Texas at Austin, 3001 Lake Austin Blvd., Suite 3.200, Austin, TX 78703-4205.