1. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Washington, Seattle, WA 98195-2700.
2. Associate Researcher, Architectural Engineering, Tokyo Inst. of Technology, 2-12-1 Meguro, Tokyo, Japan 152-8552.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Washington, Seattle, WA 98195-2700.