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이장현(Jang-Hyun Lee),최환석(Hoan-Suk Choi),강태우(Tae-Woo-Kang),이우섭(Woo-Seop Rhee) 대한전자공학회 2011 대한전자공학회 학술대회 Vol.2011 No.12
Recently, Data traffic of mobile internet is increased by spread of smart phone. Therefore, Distributed traffic mechanism is needed. So, In this paper, we propose Distributed handover mechanism to distribute traffic and provide seamless services using tunneling. Also, we present a performance evaluation by using ns-2.
선박해양 구조물의 배관 자재 관리를 위한 Enterprise BOM 의 설계와 구현 사례
이장현(Lee, Jang Hyun),김승현(Kim, Seung Hyun),이황범(Lee, Hwang Beom),장기삼(Jang, Gi Sam) (사)한국CDE학회 2010 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2010 No.1
Both enterprise information systems and CAD utilizes the BOM (Bill of Material) as the means of collaborative integration during the product design and production since the BOM has been commonly used for design, production planning, procurement, and production works. Therefore, BOM can be the referential data when it expresses not only the part lists but also product information required by product development process. Outfitting design is one of major design works in marine vessel design since marine vessels have various outfitting systems and huge number of parts. Also, the outfitting BOM has the evolutional forms that change from the initial design to the production design. In order to express the product information and part list in the enterprise BOM and the evolutional BOMs in each lifecycles, enterprise BOM of outfitting that consists of structure BOM and display BOM is suggested. Thereafter, we have developed the prototype of enterprise BOM in which some features of the outfitting BOM are implemented.
LNG 화물창 방열재 균열에 따른 액화천연가스의 확산 및 온도 예측을 위한 수치 모델
이장현(Jang Hyun Lee),김윤조(YoonJo Kim),황세윤(Se Yun Hwang) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.6
The leakage of cryogenic LNG through cracks in the insulation membrane of an LNG carrier causes the hull structure to experience a cold spot as a result of the heat transfer from the LNG. The hull structure will become brittle at this cold spot and the evaporated natural gas may potentially lead to a hazard because of its flammability. This paper presents a computational model for the LNG flow and heat diffusion in an LNG insulation panel subject to leakage. The temperature distribution in the insulation panel and the speed of gas diffusion through it are simulated to assess the safety level of an LNG carrier subject that experiences a leak. The behavior of the leaked LNG is modeled using a multiphase flow that considers the mixture of liquid and gas. The simulation model considers the phase change of the LNG, gas-liquid multiphase interactions in the porous media, and accompanying rates of heat transfer. It is assumed that the N096-GW membrane storage is composed of glass wool and plywood for the numerical simulation. In the numerical simulation, the seepage, heat diffusion, and evaporation of the LNG are investigated. It is found that the diffusion speed of the leakage is very high to accelerate the evaporation of the LNG.