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裵鉉悳 관동대학교 1987 關大論文集 Vol.15 No.2
In this paper, a design technique of IIR digital filters using adaptive algoritnm is presented. This method begins with the specification of discrete set of arbitrary magnitude and phase characteristics which describe a designed filter response. These frequency domain specifications are used to create an ideal filter whose impulse response is unknown ans non-causal. The advantage of this method is to give arbitrarily specifications of magnitude and phase at equally-spaced frequeneies, and to use arbitrary cost weighting. In experimental results we achieved flat response in pass-band, -40dB response in stop-band, sharf cut-off in transition band, and phase is linear in pass-band.
차성철,김대성,최훈,손상욱,배현덕 충북대학교 컴퓨터정보통신 연구소 2004 컴퓨터정보통신연구 Vol.12 No.2
디지털 워터마크는 디지털 자료를 모사로부터 보호하는 방법이다. 그르므로 디지털 워터마크는 파일변환, 컬러변환, 약간의 몽롱화, 압축과 같은 치리에서 뿐 아니라 인쇄, 복사, 스캐닝에 대해서도 강인해야한다. 본 논문은 워터마크 추출을 위한 키 데이터와 독립성분분석을 이용하는 알고리즘을 제안한다. 이 기법에서는 워터마크는 사람의 눈에 덜 민감한 원 영상의 웨이블릿변환 계수에 삽입된다. 그리고 독립성분분석 알고리즘은 서로 확률 분포가 다른 워터마크와 계수를 분리한다. 실험결과 워터마크가 워터마크 영상에서 사람 눈으로 인지할 수 없음을 보였으며, 워터마크 영상으로부터 키 데이터를 이용 영상이 일부 제거된 경우, 잡음이 첨가된 경우, JPEG 압축에서 워터마크의 추출이 가능함을 보였다. A digital watermark is a method to protect digital material from counterfeit. Therefore, it must be robust to withstand any processing, such as file format conversions, color conversions, slight blurring, sharpening color adjustment and compression as well as printing, copying and scanning. This paper proposed a method using key data and ICA algorithm for extraction of watermark. In this Method, we embed the watermark to the wavelet transform coefficients of original image which located in less sensitive subband to human eyes. ICA algorithm separated between watermark and coefficient that differs with probability distribution function each other. The experiment results have shown that the watermark is invisible to human eyes in watermarked image, and it is possible for watermarked image to extract the watermark with key data in various environment, such as removing, mixed noises and JPEG compressions.
이차원 LMS 알고리즘의 Systolic Array 구현
박완수,최훈,홍기섭,박봉수,배현덕 충북대학교 컴퓨터 정보통신 연구소 2000 컴퓨터정보통신연구 Vol.8 No.1
적응알고리듬의 VLSI 구현에 있어서 파이프라이닝이나 시스토릭과 같은 구조적 설계기법을 이용하여 알고리듬을 변환하는 것은 효과적이다. 알고리듬 변환은 z-변환 영역에서 연산의 규칙성과 반복성을 찾아 이루어 진다. 본 논문에서는 이차원 필터와 계수갱신 시스템을 시스토릭 구조로 설계하여 LMS의 확장 형태인 TDLMS을 STDLMS로 변환한다. 변화된 STDLMS를 이용 이차원 ALE를 Altera사의 Max-PlusII 상에서 구현하여 시뮬레이션을 통해 성능을 평가한다. 시뮬레이션 결과 salt-pepper 잡음과 가우시안 잡음에 오염된 화상을 ALE가 개선할 수 있음을 보였다. In VLSI realization of adaptive algorithm. it is necessary and efficient that the algorithm is transformed to structural one suitably using architectural design techniques such as pipelining or systolic array. These transform method use regular and recursive of operation of the algorithm on z-transform domain. In this paper, the TDLMS which is a extended version of LMS is transformed to STDLMS which has systolic array architecture in two dimensional filter and coefficients update system. The transformed STDLMS is applied for realization of two dimensional ALE. And the ALE performances are evaluated by Max-PlusII of Altera Co.. The simulation results show that the ALE enhances image data which were corrupted by salt-pepper noise and Gaussian noise.
Hyeon-Deok Bae 충북대학교 컴퓨터정보통신연구소 2012 컴퓨터정보통신연구 Vol.20 No.1
This paper describe a method that a filter bank and adaptive self-tuning filter to detect and estimate of inter-harmonics of power signals. The proposed method decomposed the input power signal using the filter bank system. The fundamental filter bank is designed to separate the odd and even harmonics to reduce spectral leakage. Adaptive self-tuning filter is used to detect inter-harmonic component and to improve estimation result. The inter-harmonic components are detected from the error signal of the adaptive filter. Computer simulations were performed on synthesized signals to assess the performance of the method.
적응예측기-이진트리구조 필터뱅크 시스템을 이용한 잡음이 부가된 시변 진동신호 분석
배현덕(Hyeon-Deok Bae) 한국정보전자통신기술학회 2017 한국정보전자통신기술학회논문지 Vol.10 No.1
회전하는 기계시스템에서는 일반적으로 시변 진동신호가 발생되며, 회전기에 고장이 있는 경우 이 신호에 잡음이 포함된다. 본 논문에서는 잡음이 포함된 시변 진동신호를 분해하기 위한 적응예측기와 이진트리구조 필터뱅크로 구성되는 시스템을 제안한다. 그리고 이 시스템에서 분석된 진동신호 결과를 회전기 고장진단에 활용할 수 있음을 보인다. 제안 시스템 적응 예측기는 주기신호성분을 예측하며, 필터뱅크 시스템에서는 입력신호와 예측된 주기신호와의 차 신호를 부밴드 대역으로 분해한다. 각 부밴드 신호에는 고장에 따른 잡음 신호성분이 포함되므로, 이를 이용 회전기의 고장진단이 가능하다. 제안한 신동신호분석 방법의 타당성을 시뮬레이션에서 보이며, 시뮬레이션에서는 주기신호성분이 제거된 진동신호를 32 부밴드로 분해하여 고장관련 신호 특성을 분석한다. Generally, a time-varying vibration signal is generated in a rotating machine system, and when there is a failure in the rotating machine, the signal contains noise. In this paper, we propose a system consisting of an adaptive predictor and a binary tree filter bank for analyzing time - varying vibration signals with noise. And the vibration signal analyzed results in this system is used for fault diagnosis of the rotating machine. The adaptive predictor of the proposed system predicts the periodic signal components, and the filter bank system decomposes the difference signal between the input signal and the predicted periodic signal into subband. Since each subband signal includes a noise signal component due to a failure, it is possible to diagnose the failure of the using rotary machine. The validity of the proposed vibration signal analysis method is shown in the simulations, where the periodic components cancelled vibrating signals are decomposed to 32 subband, and the signal characteristics related faults are analyzed.
배현덕(Hyeon-Deok Bae) 대한전기학회 2019 전기학회논문지 Vol.68 No.7
In power signal quality analyses, accurate detection of harmonics, inter harmonics, triggering points and flicker is important. This paper presents a technique which employ filter bank system, adaptive predictor and recursive algorithm for detecting harmonics, inter harmonics, triggering points and flicker. Filter bank system decompose input signal to sub bands, and then each sub band signals are processed by adaptive predictor. Magnitudes and frequencies of harmonics are estimated at predictor outputs by recursive algorithm. And inter harmonics are detected by the same processing at predictor error terminal. To detect triggering points of power signal event, error signal power change of adaptive predictor is used. In detecting flicker, filter bank composed by three filters is used. The magnitudes and frequencies of each filter outputs are obtained by recursive algorithm, and from these data flicker’s magnitude and frequency are calculated. To asses validities of the method, simulations were performed by synthesized input signals based on IEC standards. And the detecting results were compared with conventional methods.