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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.
에어컨용 PFC Boost Converter의 전도 노이즈 저감
이성희(S.H. Lee),김이훈(L.H. Kim),김영규(Y.G. Kim),원충연(C.Y. Won),김태덕(T.D. Kim),김대경(D.K. Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
Switching PFC converters are widely used not only to comply the power quality specification but also for maximum efficiency. However switching PFC converters generate serious electromagnetic interference(EMI).<br/> In this paper to solve this problem, we applied the APW(Anti Phase Winding) and RPWM(Ran -dom PWM) technique to PFC boost converter and obtained satisfactory results.<br/> Simulation and experimental results show the improved harmonic and reduced EMI effect in air-conditioner system.<br/>