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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),염현호(Hyun-Ho Yum),홍민성(Min-Sung Hong) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.6
ABS(Anti-skid Brake System) had been developed on purpose of most effect at breaking in limited runway. An aircraft has a large amount of kinetic energy on landing. When the brakes are applied, the kinetic energy of the aircraft is dissipated as heat energy in the brake disks between the tire and the ground. The optimum value of the slip during braking is the value at the maximum coefficient of friction. An anti-skid system should maintain the brake torque at a level corresponding to this optimum value of slip. This system is electric control system for brake control valve at effective control to prevent slip and wheel speed or speed ratio. In this study we measured the thickness of the carbon disk before and after to find its wear and it shows that carbon disk brake has higher stiffness and strength than metal disk at high temperature. In addition, thermal structural stability and appropriate frictional coefficient of the carbon disk brake prove its possible substitution of metal disk brake.
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.
비접촉식 손동작 인식 및 촉감 피드백 기반 가상 조작계 컨셉 연구
이장현(Jang Hyeon Lee),김동구(Dong Gu Kim),김현수(Hyun Soo Kim) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
Mobility is shifting its paradigm to become another living space, and there is an increasing demand for a human machine interface (HMI) that enables contactless operation and interaction in infotainment systems, due to functional flexibility and spatial design/efficiency considerations. In this study, we developed a contactless interface concept that allows all passengers to flexibly use desired contents from any seats in future mobility, such as purpose-built vehicles (PBVs). The contactless interface concepts were designed using several hardware components, with two types: tap motion-based virtual controller and center control panel (CCP) based virtual controller. The tap motion controller offers a contactless interaction with operation similar to conventional tablet devices, while the CCP controller was developed replicating a knob-type HMC controller for the same purpose. Furthermore, we conducted user experience (UX) evaluations on the two types of virtual controllers with both expert and non-expert groups in the relevant field, resulting in valuable directions and insights for the future mobility.