1. Assistant Professor, Dept. of Civil Engineering, Univ. of Texas at Austin, 1 Univ. Station C1752, ECJ 5.436, Austin, TX 78712-0273.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Carnegie Mellon Univ., 5000 Forbes Ave., Porter Hall 118N, Pittsburgh, PA 15213-3890.
3. Associate Professor, Graduate School of Library and Information Science, Univ. of Illinois at Urbana-Champaign, 501 East Daniel St., Champaign, IL 61820.