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수정된 EVS를 이용한 Delaunay 삼각형 재구성에 관한 연구
김동윤,신동규,김동윤,Kwon E.C.,Shin D.K.,Kim D.Y. 대한의용생체공학회 2000 의공학회지 Vol.21 No.3
표면에 의한 3차원 재구성 방법 중 Delaunay 삼각형 분할 방법은 기존의 기하학적 연결성 문제를 해결하고 영상의 질도 높은 것으로 평가받고 있다. 그러나 이 방법은 윤곽선의 위치에 따른 비 입체적 연결성 문제를 갖고 있다. 본 논문에서는 PC환경에서 이러한 문제를 개선한 Delaunay 삼각형 분할 재구성 방법을 제안하였다. 제안된 방법은 기존의 방법에서 나타나는 '비 입체(non-solid)‘ 사면체의 효과적인 처리를 위하여 수정된 External Voronoi Skeleton(EVS)을 이용한 제거 알고리즘을 사용하였다. 이를 적용한 결과. 원 객체 형태에 영향을 주지 않으면서 '비 입체' 사면체만이 제거됨을 확인할 수 있었다. 그리고 재구성된 영상의 표면이 사면체로 촘촘하게 연결되므로 복잡한 형태를 갖는 입체의 표면을 효과적으로 재구성할 수 있었다. The Delaunay triangulation. which is one of the surface rendering methods. have been evaluated as a good algorithm which can solve the geometrical connection problems and make high quality images. However this method also have the problem that is the 'non-solid' connection between slices. In this paper, we proposed a new method for the Delaunay triangulation for the surface rendering from 2D medical images in the PC environment. The proposed method was designed to eliminate 'non-solid' tetrahedra. which had no correspondence to the geometric closeness, and used elimination algorithm with modified External Voronoi Skeleton path. This method enabled us to eliminate 'non-solid' tetrahedra without affecting other regions. Thus we could effectively reconstruct the complex shaped objects which were compactly connected with tetrahedra.
3차원 원격 스캐너를 이용한 알루미늄 5000 계열의 레이저 용접에서 공정 변수에 따른 용접 특성 분석
김동윤(D. Y. Kim),박영환(Y. W. Park) 한국레이저가공학회 2011 한국레이저가공학회지 Vol.14 No.2
The latest trends of vehicle technology development are fuel efficiency improvement, body designs declining air resistance and lightweight of materials. Especially, as lightened weight of materials makes engine efficient so that vehicles keep the best performance, it is the best way to protect the environment and reduce fuel consumption. In this study, we conducted laser welding by using 3-dimension remote scanner that is 5J32 aluminium alloy. Futhermore, conduction experiment that was 3 times repeated for changing factors such as observing angle, laser power and welding speed. we observed exterior and cross section of weled part and tensile strength. When increasing laser power and decreasing laser speed, tensile strength increased. In order to evaluate factors that affect tensile strength qualitatively we conducted ANOVA. We assumed that the factors are observing angle, laser power and welding speed. Then we found that laser power and laser speed affect tensile strength. We conducted evaluation of weldability of aluminium alloy by above ways.
김동윤 ( D. Y. Kim ),김동선 ( D. S. Kim ),권의철 ( E. C. Kwon ),임영훈 ( Y H. Rim ),손진훈 ( J. H. Sohn ) 한국감성과학회 1997 연차 학술대회 논문집 Vol.1997 No.-
We present several biosignal measurement results and analysis algorithms for the visual stimulus from International Affective Picture Sytem. Since human body is nonlinear dynamic system, we investigated both linear and nonlinear methods. We found that the alpha wave of EEG, the chaos of peripheral blood pressure, the LF /HF of HRV and the return map of RR interval were good parameters for the measuremet of human sensibility. These can be used as the parameters for the measurement of`` human sensibility.
능동제어식 현가계의 유압 구동장치에 대한 단순화 모델 유도
김동윤(D.Y.Kim),홍예선(Y.S. Hong),박영필(Y.P. Park) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This work is concerned with the deduction of the simplified hyduaulic actuator system in the low-band type active control suspension system. From the simulation of the hydraulic actuator system, the 10^th order hydraulic model is derived. The 10^th order model is simplified to the 2^nd order one by considering. the 1st time delay constant in the accumulator and regarding the dynamics of the spool in electric proportional pressure control valve as the 1st order system. The simplified 2^nd order model of hydraulic system is verified by comparing the simulation result of the simplified model with the. 10th order's. And the low-band type active suspension car model is build up by combining of the quarter car and the simplified 2^nd order hydraulic actuator model. Sky hook control scheme is applied to this model. From the experiment results of suspension characteristcs in quarter car test rig, it is shown that the simplified 2^nd order actuator model is a reasonable one for describing the dynamics of real hydraulic system in the low-band type active suspension system.<br/>