1. Ph.D. Student, Charles E. Via Jr. Dept. of Civil and Environmental Engineering, Virginia Tech, 121 Patton Hall, Blacksburg, VA 24061.
2. Assistant Professor, Dept. of Civil, Environmental and Infrastructure Engineering, George Mason Univ., Fairfax, VA 22030.
3. Associate Professor, Dept. of Psychology, Univ. of Nebraska–Lincoln, B82 East Stadium, Lincoln, NE 68588.