1. Research Associate, Louisiana Transportation Research Center, Louisiana State Univ., Baton Rouge, LA.
2. Research Associate, Dept. of Civil, Architectural, and Environmental Engineering, Missouri Univ. of Science and Technology, Rolla, MO.
3. Graduate Research Assistant, Dept. of Civil, Architectural, and Environmental Engineering, Missouri Univ. of Science and Technology, Rolla, MO.
4. Professor, Dept. of Civil, Architectural, and Environmental Engineering, Missouri Univ. of Science and Technology, Rolla, MO.