1. Grad. Student Res., School of Civ. Engrg., Purdue Univ., West Lafayette, IN 47907.
2. Asst. Prof., Dept. of Civ. Engrg., Univ. of California, 109 McLaughlin Hall, Berkeley, CA 94720.
3. Asst. Prof., School of Civ. Engrg., Purdue Univ., West Lafayette, IN 47907.