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선박 외판 성형에서 목적 형상과 전개 평판의 최적 정합을 위한 ICP(Iterative Closest Point) 알고리즘 적용
이장현(Jang Hyun Lee),윤종성(Jong Sung Yoon),류철호(Cheolho Ryu),이황범(Hwang Beom Lee) (사)한국CDE학회 2009 한국CDE학회 논문집 Vol.14 No.2
Generally, curved surfaces of ship hull are deformed by flame bending (line heating), multi-press forming, and die-less forming method. The forming methods generate the required in-plane/bending strain or displacement on the flat plate to make the curved surface. Multi-press forming imposes the forced displacements on the flat plate by controlling the position of each pressing points based upon the shape difference between the unfolded flat plate and the curved object shape. The flat plate has been obtained from the unfolding system that is independent of the ship CAD. Apparently, the curved surface and the unfolded-flat surface are expressed by different coordinate systems. Therefore, one of the issues is to find a registration of the unfolded surface and the curved shape for the purpose of minimum amount of forming works by comparing the two surfaces. This paper presents an efficient algorithm to get an optimized registration of two different surfaces in the multi-press forming of ship hull plate forming. The algorithm is based upon the ICP (Iterative Closest Point) algorithm. The algorithm consists of two iterative procedures including a transformation matrix and the closest points to minimize the distance between the unfolded surface and curved surfaces. Thereby the algorithm allows the minimized forming works in ship-hull forming.
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.
Jang Hyun LEE(이장현),HE DONG(하동),Eung Jung HAN(한은정),Seong Hyun KIM(김승현) (사)한국CDE학회 2010 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2010 No.1
PLM (Product Lifecycle Management) generally supports the collaborative environment during the product design and the production, while PLCS (Product Lifecycle Support System) or ALM (Asset Lifecycle Management) system provides all the information to maintain, fix and discard/recycle all the parts of the product mainly during MOL (Middle of Life) and EOL (End of Life). Present study suggests the PLCS system of marine vessels. First, the product structure model of the PLCS during the MOL and product data is defined by the object decisions. Thereafter, the method of part identification is implemented by RFID and AR (Augmented Reality). AR and RFID were applied to the PLCS in order to make the maintenance work interact with computer to get the right maintenance information. An example of the marine PLCS was developed based upon the relational database in conjunction with NXP CLRC632 contact-less reader IC and tags.
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.