1. Assistant Professor, School of Civil, Environmental, and Architectural Engineering, Korea Univ., 1, 5Ga, Anam, Sungbuk, Seoul, 136-701, South Korea.
2. Principal Researcher, Daewoo Institute of Construction Technology, 60, Songjuk, Jangan, Suwon, Kyonggi, 440-210, South Korea.
3. POSCO Chair Professor, School of Civil, Environmental, and Architectural Engineering, Korea Univ., 1, 5Ga, Anam, Sungbuk, Seoul, 136-701, South Korea.