http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
남현도(Hyun Do Nam),안동준(Dong Jun Ahn),최영훈(Young Hoon Choi) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
한국철도공사의 조사에 의하면 KTX 이용 시 승객들이 느끼는 가장 불편한 점 중에 하나로 소음문제를 지적하고 있다. 특히 한국은 프랑스 등 유럽 국가와 달리 터널 구간이 차지하는 비중이 높아 터널 구간에서의 소음이 심각한 문제가 되고 있다. 본 연구에서는 KTX 터널 구간 운행 시 발생하는 소음을 능동소음제어 기법으로 제어하는 가능성을 알아보기 위하여 안정도가 강화된 IIRLMS 알고리즘을 이용하여 KTX 소음을 저감하는 능동소음제어시스템을 제안하고, 이를 이용하여 직접 측정된 KTX 소음을 제어하는 컴퓨터 시뮬레이션을 수행하였다.
안정화된 다중채널 RLMS 알고리즘을 이용한 덕트의 능동소음제어
남현도(Hyun-Do Nam),남승욱(Seung-Uk Nam),서성대(Sung-Dae Seo),안동준(Dong-Jun Ahn) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
An adaptive IIR filter in ANC(Active Noise Control) systems is more effective than an adaptive FIR filter when acoustic feedback exists, in which cause an order of an adaptive FIR filter must be very large if some of poles of the ideal control filter are near the unit circle. But the FIR filters may have stability problems especially when the adaptive algorithm for adaptive filters is not yet converged. In this paper, a stabilized multi-channel recursive LMS (MCRLMS) algorithm for an adaptive multi-channel IIR filter is presented. RLMS algorithms usually diverge before the algorithm is not yet converged. So, in the beginning of the ANC system, the stability of the RLMS algorithms could be improved by pulling the poles of the IIR filter to the center of the unit circle. and returning the poles to their original positions after the filter converges. Computer simulations and experiments for dipole ducts using a TMS320C32 digital signal processor have performed to show the effectiveness of a proposed algorithm.