1. Ph.D. Candidate, Dept. of Civil Engineering and Engineering Mechanics, Columbia Univ., 638A S.W. Mudd Building, New York, NY 10027 (corresponding author).
2. Professor and Chairperson, Dept. of Civil Engineering and Engineering Mechanics, Columbia Univ., 640 S.W. Mudd Building, New York, NY 10027.
3. Research Engineer, Physical Acoustics Corporation, 195 Clarksville Road, Princeton Junction, NJ 08550.
4. Assistant Manager, Engineering Strategy Team, Samsung Corporation, 250-2 ga, Taepyung-ro, Chung-gu, Seoul 100-742, South Korea.
5. Engineering Manager and Technical Director, Parsons Transportation Group, 100 Broadway, New York, NY 10005.