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김수균,김창헌,김선정 한국정보과학회 2004 정보과학회논문지 : 시스템 및 이론 Vol.31 No.5
This paper proposes a new mesh simplification algorithm using differential error metric. Many simplification algorithms make use of a distance error metric, but it is hard to measure an accurate geometric error for the high-curvature region even though it has a small distance error measured in distance error metric. This paper proposes a new differential error metric that results in unifying a distance metric and its first and second order differentials, which become tangent vector and curvature metric. Since discrete surfaces may be considered as piecewise linear approximation of unknown smooth surfaces, theses differentials can be estimated and we can construct new concept of differential error metric for discrete surfaces with them. For our simplification algorithm based on iterative edge collapses, this differential error metric can assign the new vertex position maintaining the geometry of an original appearance. In this paper, we clearly show that our simplified results have better quality and smaller geometry error than others. 본 논문은 미분오차 척도를 이용하여 메쉬를 간략화하는 새로운 알고리즘을 제안한다. 많은 간략화 알고리즘은 거리 오차 척도를 이용하였으나, 거리 오차 척도는 높은 곡률을 갖는 동시에 작은 거리 오차를 갖는 지역에 대해서는 메쉬 간략화를 위한정확한 기하학적 오차 측정이 어렵다. 본 논문은 간략화를 위해 새로운 오차 척도인 미분 오차 척도를 제안한다. 미분 오차 척도란 거리 오차 척도와 거리 오차의 1차 미분인 탄젠트 오차 척도, 그리고 거리 오차의 2차 미분인 곡률 오차 척도를 합하여 정의된 오차 척도로서, 모델의 특징 부분의 형상을 최대한으로 보존 가능하다. 메쉬는 이산 표면이지만 알지 못하는 부드러운 표면의 불연속 선형 근사로 표현될 수 있고, 이산 표면은 미분이 추정 가능하므로 미분 오차 척도라는 새로운 개념을 도입할수 있다. 본 간략화 알고리즘은 반복적인 모서리 축약(Edge Collapse)에 바탕을 두고 있고, 미분 오차 척도를 이용하여 기하학적으로 원래의 형상이 잘 유지되는 새로운 점의 위치를 찾을 수 있다.본 논문에서는 기존 방법보다 더 작은 기하학적인 오차와 높은 품질의 간략화 된 모델의 예를 보여준다.
김수균,김석훈 한국지식정보기술학회 2010 한국지식정보기술학회 논문지 Vol.5 No.4
With evolution of computer graphics, especially non-photorealistic rendering (NPR), detecting of feature from polygonal mesh became a very popular technique. Crest lines are some data detected from a polygonal mesh that contains a lot of information about the geometry of the mesh. Here we are interested in linear features, set of lines, that can best convey model’s shape. The purpose of this paper is to overview the most popular types of features and methods to extract them from a 3D model represented by polygonal mesh data.
교원의 여가시간 및 활동에 관한 조사연구 -충남도내 초등교사를 대상으로-
김수균 공주교육대학교 초등연구원 1976 公州敎大論叢 Vol.12 No.2
Dividing teacher’s daily life from sleeping, traffic, works leisure-time, and sum- marizing the leisure-time inside or outside the school during the vacation: 1) Man teachers have more leisure-time than woman teachers in a day. 2) On getting up women must be ready for the breakfast and men read the news, paper or take an exercise untill starting the work. 3) They enioy watching TV, reading a book and newspaper after dinner. 4) They manage the house, watch TV and take a rest on Sunday. 5) They can’t have the leisure-time during their school life because they have a lof of miscellane ous business and works excepting of the classes. 6) They want to travel and climb the mountain during the vacation, but thir activities are being usually controlled. 7) They temporarily prepare the cost of the activities in the leisure-time and they usually react low about saving. 8) Women have been little satisfied with the activities of the leisure-time than meru 9) It is said that they have little time to enjoy the leisure-time.
김수균 공주교육대학교 초등연구원 1970 公州敎大論叢 Vol.7 No.1
To kippe on the Horizqatal bar is to stand Suspended by the arms and swing, bendingand opening the body. This is the best mark of a support exercise in school training and of a conjucntional role in game Circl es, Those many people would like to master the kippe, Therefore, those who cannot do the fundamental moves of the kippe must analyze their actions and Correct their basic mistakes so as to be able to do the kippe.