1. Graduate Student Researcher, Dept. of Structural Engineering, Univ. of California at San Diego, La Jolla, CA 92093-0085.
2. Professor, Dept. of Structural Engineering, Univ. of California at San Diego, La Jolla, CA 92093-0085.
3. Visiting Associate Professor, Dept. of Structural Engineering, Univ. of California at San Diego, La Jolla, CA 92093-0085.