Affiliation: | 1. Department of Civil Engineering, Sunmoon University, 100, Kalsan-ri, Tangjeong-myeon, Asan-si, Chungnam-do, 336-708, Republic of Korea 2. Department of Civil Engineering, Yeungnam University, 214-1, Dae-dong, Gyeongsan-si, Gyeongbuk-do, 712-749, Republic of Korea
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