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연근해 어선부원 기초안전교육 실효성 확보 방안에 관한 연구
최윤원(Yoon-Won CHOI),조장원(Jang-Won CHO),김기선(Ki-Sun KIM) 한국수산해양교육학회 2023 水産海洋敎育硏究 Vol.35 No.5
The incidence of occupational accidents (death and disappearance) in coastal and offshore fishing vessels during recent 5 years (2017-2021) was found to be 4.5 times higher than ocean-going fishing vessels. The study aims to propose policies that enhance safety training effectiveness for coastal and offshore fishers by analyzing the current training and supervision system. This analysis is intended to reduce marine accidents among coastal and offshore fishers. Problems of the training system identified from the findings are that of the application scope of those subject to the basic safety training (ratings) in [Table 5-5] of Enforcement Rule of the Seafarers Act and that of exemption from basic safety training pursuant to Remarks No. 4. Also, a problem of supervisory system was identified that domestic and foreign ratings in coastal and offshore fishing vessels failed to complete basic safety training due to the provision of official exemption. Hence, as methods for improvement thereof, this study proposed that the scope of those subject to basic safety training (fishing vessel ratings) be expanded to fishing vessels with gross tonnage of 20 tons or higher as in the Seafarers Act, and that the provision of exemption from basic safety training (ratings) in [Table 5-5] Remarks 4 of Enforcement Rule of the Seafarers Act be deleted. And as a method for the improvement of supervisory system, this study proposed that the provision of exemption from official approval of seafarers’ list for the ratings of coastal and offshore fishing vessels should be deleted as a way to secure executive power for basic safety training for domestic and foreign ratings of coastal and offshore fishing vessels.
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전기차 해상운송량 증가에 따른 PCTC RO-RO 구역 전기차 배터리 화재 대응을 위한 연구
조장원(Jang-Won CHO),최윤원(Yoon-Won CHOI),채원성(Won-Seong CHAE),손태원(Tea-Won SON),김기선(Ki-Sun KIM) 한국수산해양교육학회 2023 水産海洋敎育硏究 Vol.35 No.6
The rapid increase in the production and distribution of electric vehicles (EVs) is driven by the global policies promoting the adoption of eco-friendly vehicles to regulate greenhouse gas and air pollutant emissions. As the maritime transport volume of EVs increases, the risk of electric vehicle fires in PCTC is increasing. A notable incident occurred in 2022 where a cargo area fire on a car carrier ship was caused by a thermal runaway of lithium-ion batteries in EVs, resulting in the vessels combustion and sinking due to the failure of fire-fighting efforts. Such incidents highlight the growing risk of battery fires in the confined spaces of RO-RO cargo areas. Despite the increasing risk of battery fires in EVs transportation, there is a lack of research on fire suppression systems, emergency response procedures, and crew training specifically addressing the fire hazards in confined RO-RO cargo areas. This study aims to investigate the characteristics and response methods for battery fires in EVs, analyze fire incidents in the cargo areas of car carrier ships, identify necessary fire suppression equipment for battery fires in confined RO-RO cargo areas, develop emergency response procedures for crew members, and contribute foundational research materials for handling fire incidents occurring during the maritime transportation of EVs.
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용적조절호형방사선치료(VMAT)의 다중치료중심(Multi- Isocenter)을 이용한 치료 시, 접합부(Junction)의 선량 변화에 대한 고찰
정동민,박광순,안혁진,최윤원,박별님,권용재,문성공,이종운,정태식,박령황,김세영,김미정,백종걸,조정희,Jung, Dong Min,Park, Kwang Soon,Ahn, Hyuk Jin,Choi, Yoon Won,Park, Byul Nim,Kwon, Yong Jae,Moon, Sung Gong,Lee, Jong Oon,Jeong, Tae Sik,Park, Ry 대한방사선치료학회 2021 대한방사선치료학회지 Vol.33 No.-
용적조절호형방사선치료(Volumetric Modulated Arc Therapy)의 다중치료중심(Multi-Isocenter)을 이용하여 치료 시, 접합부(Junction)의 재현 오차에 따른 선량변화에 대해 고찰하였다. Arccheck Phantom에 임의의 치료부위를 설정하고, 다중치료중심에 대해 치료계획을 수립하였다. 그리고 X(왼쪽), Y(위쪽), Z(안쪽, 바깥쪽) 방향에 대해서 접합부의 오차를 0 ~ 4 mm로 설정 후 선형가속기를 이용하여 방사선을 조사하였고, 이 후 phantom을 통해 얻어진 점 선량(point dose)과 감마인덱스(gamma Index)를 통해 분석하였다. X방향과 Y방향에 대한 오차가 2, 4 mm 발생 했을 때, 감마패스율(점 선량)은 각각 99.3% (2.085), 98% (2.079 Gy) 와 98.5% (2.088), 95.5% (2.093 Gy)로 나타났다. 그리고 Z방향에 대해서 안쪽과 바깥쪽에 대한 오차가 1, 2, 4 mm 발생 했을 때, 감마패스율(점 선량)은 각각 94.8% (2.131), 82.6% (2.164), 72.8% (2.22 Gy) 와 93.4% (2.069), 90.6% (2.047), 79.7% (1.962 Gy) 로 보여졌다. X, Y방향에 대해서 4 mm 까지의 오차 결과는 허용오차 안에 있었으나, Z방향에 대해서는 1 mm 를 초과하는 오차 값에 대해서 허용오차 밖의 결과 값이 도출되었다. 이는 높은 선량 영역(high dose area)과 낮은 선량 영역(low dose area)에 대해 치료부위의 진행방향과 같은 방향의 오차가 선량 분포(dose distribution)가 더 민감하다는 것을 시사한다. 향후 지속적인 연구를 통해 기관차원의 셋 업(set up) 오차에 대한 가이드라인이 정립된다면, 접합부를 이용한 치료에서 양질의 치료를 제공할 수 있을 것이라 사료된다. This study examined dose change depending on the reposition error of the junction at the time of treatment with multi-isocenter volumetric modulated arc therapy. This study selected a random treatment region in the Arccheck Phantom and established the treatment plan for multi-isocenter volumetric modulated arc therapy. Then, after setting the error of the junction at 0 ~ 4 mm in the X (left), Y (upper), and Z (inner and outer) directions, the area was irradiated using a linear accelerator; the point doses and gamma indexes obtained through the Phantom were subsequently analyzed. It was found that when errors of 2 and 4 mm took place in the X and Y directions, the gamma pass rates (point doses) were 99.3% (2.085) and 98% (2.079 Gy) in the former direction and 98.5% (2.088) and 95.5% (2.093 Gy) in the latter direction, respectively. In addition, when errors of 1, 2, and 4 mm occurred in the inner and outer parts of the Z direction, the gamma pass rates (point doses) were found to be 94.8% (2.131), 82.6% (2.164), and 72.8% (2.22 Gy) in the former part and 93.4% (2.069), 90.6% (2.047), and 79.7% (1.962 Gy) in the latter part, respectively. In the X and Y directions, errors up to 4 mm were tolerable; however, in the Z direction, error values exceeding 1 mm were beyond the tolerance level. This suggests that for high and low dose areas, errors in the direction same as the progress direction in the treatment region have a more sensitive dose distribution. If the guidelines for set-up errors are established at the institutional level through continuous research in the future, it will be possible to provide good quality treatment using junctions.
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