Affiliation: | (1) Department of Applied Mathematics, Hanyang University, 1271 Sangnok-gu, Ansan, 426-791, Republic of Korea;(2) Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3111, USA;(3) Department of Civil Engineering, School of Industrial Technology, Myongji College, Seoul, 120-847, Republic of Korea;(4) School of Civil and Environmental Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul, 120-749, Republic of Korea |