1. Professor, Civil and Environmental Engineering, Rice Univ., 6100 Main St., MS-317, Houston, TX 77005.
2. Research Scientist, Civil and Environmental Engineering, Rice Univ., 6100 Main St., MS-317, Houston, TX 77005.
3. Graduate Student, Civil and Environmental Engineering, Rice Univ., 6100 Main St., MS-317, Houston, TX 77005.
4. Professor, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, 202 W Boyd St., Room CEC334, Norman, OK 73019.