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An Approach for Scheduling Problem in Port Container Terminals : Moving and Stacking
HA Phuoc Lan,LE Ba Toan,HUYNH Tuong Nguyen,NGUYEN An Khuong,NGUYEN Van Minh Man 한국인터넷방송통신학회 2015 International Journal of Internet, Broadcasting an Vol.7 No.1
In this study, we consider the transportation problem in port container terminals. It aims to determine positions in yards to place the containers at the adequate times. The containers on ship must be unloaded one by one from top to bottom, and placed in the main yard in order to reduce additional cost required for unnecessary unloading when getting out by customer with given timetable. The cost for transportation at container terminals could be reduced by a new approach in scheduling: move the containers from ship and stack them onto main yard that minimizes cost of yard crane operation when unloading for customer.
Sunghoon Hong,Yeon Myeong Jeong,Taeyoon Kim,Van Men Huynh,Inho Kim,Jungmin Nam,Dong Soo Hur,Jooyong Lee,Soonchul Kwon 한국해양공학회 2021 韓國海洋工學會誌 Vol.35 No.1
Artificial Coral Reefs (ACRs) have been introduced to help solve coastal erosion problems, but their feasibility has not been assessed with field data. This study conducted a feasibility analysis of ACRs on their erosion mitigation effects by performing a case study of Cheonjin-Bongpo beach, South Korea. A numerical-physical combined analysis was carried out using a SWAN model simulation and physical model test with a scale of 1/25 based on field observations of Cheonjin-Bongpo beach. Both Dean’s parameter and the surf-scaling parameter were applied to comparative analysis between the absence and presence conditions of the ACR. The results for this combined method indicate that ACR attenuates the wave height significantly (59~71%). Furthermore, ACR helps decrease the mass flux (~50%), undertow (~80%), and maximum wave set up (~61%). The decreases in Dean’s parameter (~66%) and the surf-scaling parameter suggest that the wave properties changed from the dissipative type to the reflective type even under high wave conditions. Consequently, an ACR can enhance shoreline stability.