1. Assistant Professor, Dept. of Architectural Engineering, Univ. of Seoul, Seoul 130-743, South Korea (corresponding author); formerly, Postdoctoral Research Associate, Korea Institute of Construction Technology, Gyeonggi-do 411-712, South Korea. E-mail: hong7@uos.ac.kr
2. Associate Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907. E-mail: hastak@ecn.purdue.edu