1. Associate Director, Research Institute of Structural Engineering & System, DongYang Structural Engineers Co., Ltd., 208, Hakdong-ro, Gangnam-gu, Seoul 135-010, Republic of Korea; formerly, Graduate Student, School of Civil, Environmental and Architectural Engineering, Korea Univ., 145 Anam-ro, Seungbuk-gu, Seoul 136-701, Republic of Korea (corresponding author).
2. Graduate Student, School of Civil, Environmental and Architectural Engineering, Korea Univ., 145 Anam-ro, Seungbuk-gu, Seoul 136-701, Republic of Korea.
3. Professor, School of Civil, Environmental and Architectural Engineering, Korea Univ., 145 Anam-ro, Seungbuk-gu, Seoul 136-701, Republic of Korea.
4. Principal Researcher, Dept. of Powder Technology, Korea Institute of Materials Science, 797 Changwon-daero, Seongsan-gu, Changwon-si, Gyeongnam 642-831, Republic of Korea.