1. Ph.D. Candidate, Intelligent Engineering Systems Laboratory, Civil and Environmental Engineering Dept., MIT, Cambridge, MA 02139.
2. Associate Professor, Construction Management and Information Technology, Civil and Environmental Engineering Dept., Univ. of Illinois at Urbana-Champaign, Urbana-Champaign, IL 61801.
3. Assistant Professor, Dept. of Architecture, Seoul National Univ., Seoul, Korea.