1. Research Assistant, Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave. 48-216-24, Cambridge, MA 02139. E-mail: ytanino@alum.mit.edu
2. Professor, Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave. 48-216D, Cambridge, MA 02139. E-mail: hmnepf@mit.edu