• 호남수학학술지
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• 제32권1호
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• pp.101-112
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• 2010

Using some interesting convolution, we find kernels recovering the given function f. By a slight change of this convolution, we obtain an identity filter related to the Fourier series in the discrete time domain. We also introduce some techniques to decompose an impulse into several dilated pieces in the discrete domain. The detail examples deal with specific constructions of those decompositions. Also we obtain localized moving averages from a decomposition of an impulse to make hybrid Bollinger bands, that might give various strategies for stock traders.

• 한국소음진동공학회논문집
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• 제25권8호
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• pp.525-531
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• 2015

Driving sound is an effective element to promote the product identity of a vehicle by providing customers with attractive sound which reflects the concept of a vehicle. Recently, major automakers are focusing on the target sound setting so that the sound can represent the brand image as well as the unique concept of a vehicle. In this study, a new method of target setting for the driving sound will be introduced based on using formant filter and musical harmonics characteristics. In addition, a target sound suggested from this method will be realized and verified by using active noise control in vehicle.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1983년도 추계학술발표회논문집
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• pp.61-64
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• 1983

It is shown that the new window function of Exponential type can be derived from Cheby-chev Identity for the design of FIR filter, and the various kinds of windows which have different characterristics can also be made by changing the coefficients of them oasily

• 대한전기학회논문지:시스템및제어부문D
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• 제55권9호
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• pp.429-434
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• 2006

In this paper, detection based - adaptive windowed nonlinear filter(DB-AWNF) is proposed for removing salt-pepper noise in infrared image. This filter is composed of impulse detector and window-size-variable median filters. Impulse detector checks whether current pixel is impulse or not using range function and nonlinear location estimator. If impulse is detected, current pixel is filtered according to four kinds of local masks by use of median filter. If not, current pixel is delivered to output like identity filter. In Qualitative view, the proposed could have removed heavy corrupted noise up to 30% and reserved the details of image. In quantitative view, PSNR was measured. The proposed could have about 12-31[dB] more improved performance than those of median $(3{\times}3)$ filter and 13-29[dB] more improved performance than those of median $(5{\times}5)$ filter.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1999년도 KOBA 방송기술 워크샵 KOBA Broadcasting Technology Workshop
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• pp.29-34
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• 1999

We present a practical method for removing biotches and restoring their mission data. To detect blotches, we employ a robust approach of local analysis of spatiotemporal anisotropic brightness continuity Our approach uses first-order spatiotemporal directional derivatives to select the smoothest direction for each examined pixel, and puts out the incorruption probability that he examined pixel may not be corrupted by blotches. As the restoration filter, were employ a spatiotemporal fuzzy filter whose response is adaptively controlled according to a fuzzy rule defined by the incorruption probability. The fuzzy filter is composed of the two different filter of the identity filter and the spatiotemporal directional-weighted-mean filter, and will put out an intermediate value between the original input brightness and the directional-weighted-mean brightness. We design the fuzzy rule in advance by a standard supervised learning fuzzy rule in advance by a standard supervised learning method. The computer simulations are presented.

• 대한전자공학회논문지SP
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• 제46권2호
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• pp.108-113
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• 2009

FIR upsampler는 입력 데이터 보다 L배 빠른 출력 신호를 생성한다. Upsampler의 효율적인 구현을 위해 일반적으로 Noble identity 공식을 이용하여 L개로 필터단을 나눈다. 본 논문에서는 나누어진 필터단 1개의 위상 지연을 정수로 만들어 필터단 1개를 제거하는 방법을 제안하였다. 제안한 방법을 이용하여 CDtoDAT에 이용되는 192탭 2배 upsampler를 하이닉스 0.18라이브러리를 이용하여 설계할 때 기존 회로에 비하여 면적, 파워, 최대위상지연에러, 최대리플에러에서 48%, 43%, 99.9%, 68% 만큼 효율적임을 확인하였다.

• International Journal of Contents
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• 제10권3호
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• pp.17-25
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• 2014

In this paper, we describe an adaptive Markov chain Monte Carlo-based particle filter that effectively addresses real-time multi-face tracking on mobile platforms. Because traditional approaches based on a particle filter require an enormous number of particles, the processing time is high. This is a serious issue, especially on low performance devices such as mobile phones. To resolve this problem, we developed a tracker that includes a more sophisticated likelihood model to reduce the number of particles and maintain the identity of the tracked faces. In our proposed tracker, the number of particles is adjusted during the sampling process using an adaptive sampling scheme. The adaptive sampling scheme is designed based on the average acceptance ratio of sampled particles of each face. Moreover, a likelihood model based on color information is combined with corner features to improve the accuracy of the sample measurement. The proposed tracker applied on various videos confirmed a significant decrease in processing time compared to traditional approaches.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.883-887
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• 2009

본 논문은 AR(P) 입력에 대해 MPDSAP 알고리즘의 적응과정의 MSE의 통계적 분석을 제시한다. 부밴드 구조에서 인접투사 알고리즘은 적응필터에 다위상 분해와 노블아이덴티티를 적용함으로써 NLMS 알고리즘으로 변환된다. 또한, P차의 Autoregressive(AR) 입력은 정규직교 분해필터에 의해 사전에 백색화 될 수 있다. 부밴드 구조에서 AR(P) 입력의 사전-백색화(pre-whitening)는 SAP 적응필터의 MSE 행동의 통계적 해석을 위한 간단하고 유효한 근사화를 제공한다.

• 한국안전학회지
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• 제13권1호
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• pp.54-63
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• 1998

This paper proposes a theoretical analysis of a closed loop adaptive speed control system for control the inverter driven permanent magnet synchronous motor(PMSM). This control system utilizes a mechanically sensorless state observer for the generation of all controller feedback information. The observer processes measurements of stator frame voltage and current to produce estimates of rotor position and speed and rotor frame currents. It is shown that the identity observer, when properly formulated, has the same linearized error dynamics as the extended kalman filter(EKF). Consequently, it is shown that the gains within the identity observer can be designed in a manner identical to that of the EKF. In this way, the designability of the nonlinear observer is assured, as is the optimality of its performance for small errors. A sequence of simulation are performed and they demonstrate the successful performance.

• 융합신호처리학회논문지
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• 제12권1호
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• pp.20-25
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• 2011

부밴드 구조에서 투사차원이 P인 전밴드 인접투사 적응필터는 최대 군위상 분해와 노블아이덴티티를 적용함으로써 P개의 적응 부필터로 분해된다. 각각의 적용 부필터는 투사차원이 1인 간단한 계수 갱신식을 갖게 된다. 이러한 부밴드 분해기법은 구현관점에서 가장 실용적인 해법 중 하나이다. 많은 응용에서 활용을 위해 MPDSAP 적응 필터의 최적 스텝사이즈 해석이 필요하다. 본 논문은 MPDSAP 적응 필터의 MSE에 대한 개선된 해석 모델을 제안하고 초기 최적 스텝사이즈를 유도한다. 컴퓨터 시뮬레이션을 통해 MSE의 개선된 해석 모텔과 유도된 최적 초기 스텝사이즈에 대해 이론과 실험적 결과 사이의 일치함을 확인하였다.