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ECG 신호를 위한 디지탈 필터의 DISTORTION 해석
남현도(Hyun-do Nam),안동준(Dong-jun Ahn),이철희(Cheol-heui Lee),장태규(Tae-gyu Chang) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
Distortion analysis of digital filters for the ECG signal processing is presented. Several band pass and band reject filters are designed for the analysis. Computer simulations are performed to compare the distortions of the Butterworth type filters and linear phase optimal filters. The designed filters are applied to power line interference cancelling in ECG signals.
〈속보논문〉 TFT-LCD 패널의 자동 결함 검출을 위한 주파수영역 전처리
南炫道(Hyun-Do Nam),南承旭(Seung-Uk Nam) 대한전기학회 2008 전기학회논문지 Vol.57 No.7
Large-sized flat-panel displays are widely used for PC monitors and TV displays. In this paper, frequency domain pre-filter algorithms are presented for detection of defects in large-sized Thin Film Transistor-Liquid Crystal Display(TFT-LCD) panel surfaces. Frequency analysis with 1-D, 2-D FFT methods for extract the periodic patterns of lattice structures in TFT-LCD is performed. To remove this patterns, frequency domain band-stop filters were used for eliminating specific frequency components. In order to acquire only defected images, 2-D inverse FFT methods to inverse transform of frequency domain images were used.