1. Ph.D. Student, Graduate Teaching Assistant, Dept. of Civil and Environmental Engineering, Portland State Univ., P.O. 751, Portland, OR 97207-0751.
2. Professor, Dept. of Civil and Environmental Engineering, Portland State Univ., P.O. 751, Portland, OR 97207-0751; Collaborative Center for Geo-hazards and Eco-Environment in Three Gorges Area, Three Gorges Univ., Yichang, China.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Portland State Univ., P.O. 751, Portland, OR 97207-0751.