• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.04a
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• pp.136-139
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• 2011

국가화재안전기준 107 및 107A에서 할로겐화합물 소화설비와 청정소화약제 소화설비 설계시 하나의 방호구역을 담당하는 저장용기의 소화약제의 체적합계보다 소화약제의 방출시 방출경로가 되는 배관(집합관을 포함한다)의 내용적의 비율이 설정된 값 이상인 경우 당해 방호구역에 대한 설비는 별도의 독립방식으로 하도록 요구하고 있다. 이산화탄소 소화설비의 경우에는 이산화탄소의 증기압이 충분히 높으므로 방출배관의 용적에 대한 제한사항이 포함되어 있지 않으나 저압이산화탄소 소화설비의 경우 약제의 저장온도가 낮으므로 방출시 기화되어 설계시 의도한 방출량을 만족시키지 못할 수 있다. 본 논문에서는 저압이산화탄소 소화설비에 대한 방출배관 용적 제한 필요성에 대하여 논의하였다.

• Journal of the Society of Naval Architects of Korea
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• v.57 no.4
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• pp.191-197
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• 2020

Pipe routing is a important part of the whole design process in the shipbuilding industry. It has a lot of constraints and many tasks that should be considered together. Also, the result of this stage affects follow-up works in a wide scope. Therefore, this part requires skilled designers and a lot of time. This study aims to reduce the workload and time during the design process by automating the pipe route design on initial stage. In this study, the reinforcement learning was used for pipe auto-routing. Reinforcement learning has the advantage of dynamically selecting routes, unlike existing algorithms. Therefore, it is suitable for the pipe routing design in ship design process which is frequently modified. At last, the effectiveness of this study was verified by comparing pipelines which were designed by piping designer and reinforcement learning results.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.9
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• pp.821-826
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• 2016

The leak before break (LBB) concept is used in pipe line design for nuclear power plants. For application of the LBB concept, leak rates through cracks should be evaluated accurately. Usually leak late analyses are performed for through-thickness cracks with constant cross-sectional area. However, the cross-sectional area at the inner pipe surface of a crack can be different from that at the outer surface. In this paper, leak rate analyses are performed for the cracks with linearly-varying cross-sectional areas. The effect of varying the cross-sectional area on leak rates was examined. Leak rates were also evaluated for cracks in bi-material pipes. Finally, the effects of crack surface morphology parameters on leak rates were examined.