1. Research Assistant, National Science Foundation Research Experience for Undergraduates, Dept. of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401.
2. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401 (corresponding author).