• 해양환경안전학회지
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• 제20권4호
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• pp.426-434
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• 2014

본 연구에서는 서해안의 해양레저 대중화를 위해 누구나 세일링을 즐길 수 있고, 두 개의 킬로 선체를 지지하여 육상 및 갯벌에서도 선체가 기울지 않고 설 수 있는 트윈킬 요트를 개발하고자 한다. 기존 세일링 요트중 성능이 좋은 편인 블루워터21의 선형을 활용하고 트윈킬 요트의 경우 모노킬 요트보다는 저항성능이 불리할 것으로 예상되므로, 블루워터21의 모노킬 면적 및 무게중심 등을 고려한 트윈킬을 개발하여 모형시험을 수행하였다. 그 결과, 모노킬과 트윈킬의 저항성능에 대한 차이가 약 4 %정도로 예상보다 크지 않음을 확인하였다.

• 한국산업융합학회 논문집
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• 제25권6_3호
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• pp.1275-1284
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• 2022

This study provides an investigating the electrolyte reaction characteristics during thermal runaway of a lithium-ion battery(LIB). Dimethyl carbonate(DMC) is known as the main substance that makes up the electrolyte. The mono-molecular decomposition characteristics of DMC were derived through numerical analysis. Cobalt oxide can release oxygen under high temperature conditions. Also, DMC is converted to CH₄, H₂, CO, and CO₂. Especially, it was found that the decomposition of the DMC begins at a temperature range of 340-350℃, which dramatically increases the internal pressure of the LIB. In the by-products gases, the molar ratio of CO and CO₂ changed according to the molecular structure of DMC and temperature conditions. The correlation of the [CO]/[CO₂] ratio according to the temperature during thermal runaway was derived, and the characteristics of the reaction temperature could be estimated using the molar ratio as an indicator. In addition, the oxidation and decomposition characteristics of DMC according to the residence time for each temperature were estimated. When DMC is exposed to low temperature for a long time, both oxidation and decomposition may occur. There is possibility of not only increasing the internal pressure of the LIB, but also promoting thermal runaway. In this study, internal environment of LIB was identified and the reaction characteristics between the active materials of the cathode and electrolyte were investigated.