1. Research Assistant, School of Civil and Construction Engineering, Oregon State Univ., Kearney 211, Corvallis, OR 97330.
2. Associate Professor, School of Civil and Construction Engineering, Oregon State Univ., Owen 307, Corvallis, OR 97330 (corresponding author).
3. Assistant Professor, Dept. of Computer Science, Rensselaer Polytechnic Institute, Lally Hall 207, Troy, NY 12180.
4. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of South Florida, ENG 207, Tampa, FL 33620.