1. Postdoctoral Research Associate, Dept. Civil Engineering, Univ. of Washington, Seattle, WA 98195-2700. E-mail: jhyoo@u.washington.edu
2. Professor, Dept. of Civil Engineering, Univ. of Washington, Seattle, WA 98195-2700.
3. Assistant Professor, Dept. of Civil Engineering, Univ. of Washington, Seattle, WA 98195-2700.