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얼굴 검출을 위한 gabor 특징 기반의 웨이블릿 분해 방법
이정문(Lee Jung Moon),최찬석(Choi Chan Sok) 강원대학교 산업기술연구소 2008 産業技術硏究 Vol.28 No.1
A real-time face detection is to find human faces robustly under the cluttered background free from the effect of occlusion by other objects or various lightening conditions. We propose a face detection system for real-time applications using wavelet decomposition method based on Gabor features. Firstly, skin candidate regions are extracted from the given image by skin color filtering and projection method. Then Gabor-feature based template matching is performed to choose face candidate from the skin candidate regions. The chosen face candidate region is transformed into 2-level wavelet decomposition images, from which feature vectors are extracted for classification. Based on the extracted feature vectors, the face candidate region is finally classified into either face or nonface class by the Levenberg-Marguardt back-propagation neural network.
능동 스너버를 갖는 ZVT PWM AC-DC 승압 컨버터
金春杉(Choon-Sam Kim),成源基(Won-Ki Sung),李廷紋(Jung-Moon Lee),崔燦石(Chan-Sok Choi),金洙弘(Soo-Hong Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.2
Most of converter system could obtain almost unity power factor and make input current sinusoidal waveform, but they have many problems, such as electromagnetic interference and switching losses caused by switching noise in main switch. To solve these problems in hard switching PFC converter, soft switching converter using a resonant between capacitor and inductor is invented In this paper, advantages and disadvantages of conventional ZVT(Zero-Voltage-Transition) soft switching converter using a auxiliary resonant circuit is discussed. Then Improved ZVT soft switching converter proposed. This improved ZVT converter's operation principal, specific property, design scheme of main are described. From Simulation and experiment results of conventional ZVT soft switching and improved ZVT soft switching converter with active snubber, characteristics of the converter are confirmed.