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쉘 구조물에서 Chordal Axis Transform 을 이용한 중립면 생성
권기연(K. Y. Kwon),박정민(J. M. Park),이병채(B. C. Lee),채수원(S. W. Chae) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
This paper describes the generation of chordal surface for various shell structures, such as automobile bodies, plastic injection mold components and shell metal parts. After one-layered tetrahedral mesh is generated by an advancing front algorithm, the chordal surface is generated by cutting a tetrahedral element. It is generated one or two elements at a tetrahedral element and the chordal surface is composed with triangular or quadrilateral elements. This algorithm has been tested on several models with rib structure.
3차원 곡면 데이터 획득을 위한 멀티 레이져 비젼 시스템 개발
이정환(J.H. Lee),권기연(K.Y. Kwon),이현철(H.C. Lee),도영칠(D.J. Choi),최두진(Y.C. Doe),박진형(J.H. Park),김대경(D.K. Kim),박영준(Y.J. Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Various scanning systems have been studied in many industrial areas to acquire a range data or to reconstruct an explicit 3D model. Currently optical technology has been used widely by virtue of noncontactness and high-accuracy. In this paper, we describe a 3D laser scanning system developped to reconstruct the 3D surface of a large-scale object such as a curved-plate of ship-hull. Our scanning system comprises of 4ch-parallel laser vision modules using a triangulation technique. For multi laser vision, calibration method based on least square technique is applied. In global scanning, an effective method without solving difficulty of matching problem among the scanning results of each camera is presented. Also minimal image processing algorithm and robot-based calibration technique are applied. A prototype had been implemented for testing.
매핑 알고리즘을 이용한 2.5차원 입체에 대한 육면체 요소망 자동 생성
최철현(C. H. Choi),채수원(S. W. Chae),권기연(K. Y. Kwon),이병채(B. C. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
This paper proposes a hexahedral mesh generation scheme based on mapping approach and improves the drawback of sweeping algorithm. In order to improve the drawback, the algorithm in this paper generates hexahedral meshes by three dimensional element mapping first. Then hexahedral meshes are equivalent to geometry of the volume by mapping and smoothing. Sample meshes are constructed to demonstrate the mesh generating capability of the proposed algorithm.
한재녕(J.N. Han),채수원(S. W. Chae),권기연(K. Y. Kwon),이병채(B. C. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
This paper deals with a hex-dominant mesh generation using an advancing front methods for three-dimensional geometries. Hexahedral and prismatic meshes are generated inwardly by offsetting from initial boundary mesh. When the meshes intersect with each other after offsetting, overlapped meshes are improved by node relocation method. In order to generate conforming mesh, pyramid elements are inserted between hexahedral and tetrahedral elements. Sample meshes for several geometries are presented and analized to demonstrate the effectiveness of the proposed algorithm.