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쉘 구조물의 용접 변형량 예측을 위한 요소망 생성 방법
권기연(Kiyoun Kwon) (사)한국CDE학회 2016 한국CDE학회 논문집 Vol.21 No.2
In shipbuilding, hull assemblies are manufactured by welding. The thermal deformation caused by the welding produces shape deformation. Counter-deformed design methods have been used in shipyards to cope with the weld-induced deformation of ship assembles. Finite element methods(FEMs) are frequently used to estimate welding distortion in the counter-deformed design. For the estimation of welding distortion, producing uniform rectangular elements is required to enter thermal loads on the welding line and obtain accurate analysis results. In this paper, a new automatic mesh generation method is proposed for prediction of welding deformation in FEM. Meshes are constructed for test cases to demonstrate the feasibility of the proposed mesh generation method.
선박 및 해양 구조물 곡부재 치수 품질 관리를 위한 가공완성도 평가
권기연(Ki-Youn Kwon),이재용(Jaeyong Lee) 한국해양공학회 2018 韓國海洋工學會誌 Vol.32 No.2
The forward and afterward parts of ships and offshore structures are designed to improve the fuel consumption performance. These are made of curved plates with a large thickness. If a fabricated curved plate has some dimensional errors, a lot of additional cost is incurred in the assembly process. Thus, an accurate dimensional assessment is very important for fabrication. In this paper, we propose an assessment method for the dimensional quality management of curved plates. This can be applied to data measured using a variety of three-dimensional instruments, with boundary measurement points automatically classified and sorted to create a measurement surface. The assessment is evaluated after matching the CAD surface and the measured surface considering constrained conditions. The fabrication assessment is evaluated as a probability of how much the tolerance is satisfied.
자전거를 이용하는 항만근로자들의 안전을 위한 파손 도로 탐지 딥러닝 디바이스, “Safe Bike(Sabi)”
권기연 ( Giyeon Kwon ),박기현 ( Gihyun Park ),이유빈 ( Yubin Lee ),이은지 ( Eunji Lee ),권태호 ( Taeho Kwon ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
자전거를 이용해 출퇴근하는 항만 근로자들은 대형화물이 만들어낸 포트홀과 같은 파손된 도로에 의해 위협받는다. 이러한 문제를 해결하기 위해 센서와 카메라로 파손 도로를 탐지하는 디바이스를 구상하였다. Port workers commuting by bicycle are threatened by damaged roads such as port halls created by large cargo. To solve this problem, a device was designed to detect broken roads with sensors and a camera.
권기연(Ki-Youn Kwon) (사)한국CDE학회 2017 한국CDE학회 논문집 Vol.22 No.1
Sharing of CAD data plays a key role in the PLM and a lightweight model is widely used for visualizing and sharing a large data. The lightweight model is mainly composed of triangular elements to minimize file size. There is no problem at all to visually confirm the shape based on these triangular elements but there is a limit to numerically calculate the exact position on the curve or surface. In this paper, a boundary curve generation method using triangular elements is proposed to increase the utilization of lightweight models. After matching connectivity of triangular elements, boundary element edges are extracted. Boundary curves are generated by connecting of these boundary element edges. This proposed method has been tested on several models to demonstrate the feasibility.