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김대운(Daewoon Kim),지중현(Joonghyun Ji),윤동호(Dongho Yun),안형갑(Hyonggap An),송가람(Galam Song),S.M. Abid Hasan,Mamona Awan,고광희(Kwanghee Ko) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
Recent research in the marine and automotive industries has been trying to apply Augmented Reality (AR). AR is used to display 3D CAD model of part or module on the 2D image captured by camera. Augmented CAD model helps mechanics to improve their work efficiency and safety by displaying specific information of part (procedure, size, position, finished product, etc.) and instructions etc. In this paper, we applied AR to marine industry, especially ship block. To augment 3D CAD model of ship block on 2D input image, ship block should be detected from 2D input image. The HSV color space and Mean shift image segmentation is used to detect ship block and by using Hough transform the lines of detected ship block are obtained. In addition, 3D CAD model is used to construct training set with known pose. By comparing training set and detected lines of input image, we obtained initial pose of the ship block. Because initial pose is not exact, more exact pose of ship block is found using Lie groups. Finally we can augment 3D CAD model on 2D input image with known camera’s intrinsic parameters and obtained pose of ship block which is same to camera’s extrinsic parameters.
영구자석 진동에 기인한 HEV용 구동모터 이상 전자기 소음의 실험적 규명
김명규(Myunggyu Kim),하재원(Jaewon Ha),김대운(Daewoon Kim),김삼균(SamKyun Kim),김연호(Yeonho Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper investigates the abnormal electromagnetic noise of HEV traction motor due to Vibration of Permanent Magnet. In the paper, we introduce the mechanical and electromagnetical cause of magnetic unbalance of the HEV tranction motor and analyze the frequency of abnormal electromagnetic noise due to magnetic unbalance. We determine the abnormal electromagnetic noise is caused by the vibration of permanent magnet. And we develop the novel magnet insert method of HEV traction motor and improve the abnormal electromagnetic noise of HEV traction motor.
대화형 프로젝션 시스템을 위한 컴퓨터 비전 기반의 그림자 제스처 인식
하현우(Hyunwoo Ha),김대운(Daewoon Kim),지중현(Joonghyun Ji),윤동호(Dongho Yun),Abid Hasan,Mamona Awan,고광희(Kwanghee Ko) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.8
This paper proposes a vision-based shadow gesture recognition method for interactive projection system. Gesture recognition method is based on the screen image obtained the web camera installed in the same position as the projector. Recognition method separates only the shadow area by combining the binary image with learning algorithm isolated background from the input image. The region of interest is set by labeling the shadow of separated regions, and then it can isolate hand shadow using defect, convex-hull and moment of each region. To distinguish hand gestures, Hu’s invariant moment method is used. In addition, we have used the multiscale retinex algorithm to solve the problem that camera cannot recognize the gesture in bright place. Optical Flow algorithm is used for tracking the fingertip and OpenGL is used for representing the result of drawing.
엔진룸 음향모드 제어를 통한 부밍대역 공기기인소음개선 연구
서민규(Minkyu Seo),채기상(Ki-Sang Chae),김대운(Daewoon Kim) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
The reduction of vehicle booming noise was conducted normally in the area of structure borne sound or intake and exhaust sound. This paper investigated the application of the Helmholz Resonator to control the acoustic mode of the engine room. The acoustic FEM and acoustic BEM techniques were examined on the cavity mode analysis. Generally the acoustic FEM is applied to the closed volume like the passenger room and the acoustic BEM to the open volume. The engine room is connected to the outer volume through the grill in the front area and through the drive line and the exhaust pipe in the rear area. This paper used the acoustic FEM technique, took the engine room and the proper exterior open volume. Considering the acoustic boundary conditions, acoustic modes was calculated and visualized. The three dimensional visualized mode gave us good results when compared with the experiment and the acoustic BEM technique. The three dimensional visual of the cavity mode gave us the optimal position of the resonator. By taking the proper shape of the resonator, the airborne booming sound was reduced at the test vehicle of high speed.