Gi Ryang Kwon1, Yong Jae Lee2, Tae Young An3, Sha Chul Shin4
1 Clean Water Center, Yecheon County Office, 111 Chungyo-ro, Yecheon-eup, Gyeongsangbuk-do, Korea
2 Sejin E&C Corporation, 99 Bongdeoknam-ro, Nam-gu, Daegu, Korea
3 Johwa Engineering Corporation, 401 Simin-daero, Dongan-gu, Anyang, Gyeonggi-do, Korea
4 Department of Civil Engineering, Gyeongkuk National University, 1375 Gyeongdong-ro, Andong, Gyeongsangbuk-do, Korea
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