• 터널과지하공간
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• 제14권5호
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• pp.305-317
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• 2004

세계적으로 장벽식 채탄법이 많이 적용된 반면, 국내에서는 좁고 경사진 탄층의 특성에 의하여 위경사승 붕락식 또는 중단 붕락식 채탄법이 주로 사용되었다. 이러한 이유로 국내에 산재하는 폐광산은 그 규모와 특성을 파악하기가 어려운 특징이 있다. 따라서, 본 고에서는 국내 채탄법의 특정을 파악한 후 이를 바탕으로 동해고속도로 2공구 현장의 폐광산에 대한 조사 및 안정성 평가를 실시하였으며 추후 당 현장에 적용 가능한 최적의 지반보강공법을 선정하였다.

• 전자공학회논문지S
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• 제35S권12호
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• pp.63-68
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• 1998

본 논문에서는 움직임 벡터의 분포특성을 이용한 고속 적응 블럭 정합 알고리즘을 제안하였다. 제안 방법에서는 움직임 벡터에 따른 MAD(0,0)의 분포특성을 분석하여 블럭을 움직임이 없는 블럭, 작은 블럭, 중간정도인 블럭 혹은 큰 블럭으로 분류한 후 각 블럭의 특성에 따라 적응적으로 움직임 벡터를 추정한다. 제안한 방법의 성능을 평가하기 위해서 컴퓨터 시뮬레이션을 수행하였다. 이 결과로부터 제안 방법의 PSNR은 기존의 NTSS 방법과 거의 비슷하면서도 계산량이 30.44% ~ 40.27% 감소되는 효과적인 방법임을 확인할 수 있었다.

• 전기전자학회논문지
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• 제24권3호
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• pp.713-718
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• 2020

피부 활성점(경혈) 측정 방법은 편리성, 저비용 및 비 침습으로 측정하기 때문에 많은 생체정보를 얻기 위한 기술이다. 본 연구에서는 피부 아래에 활성점을 측정할 수 있는 장점이 있는 3전극 측정방법을 사용되었다. 임피던스측정방법은 측정실험 결과와 관련성이 있는 등가전기회로를 통해서 증명되었다. 활성점의 특성주파수는 주변 피부보다 15-30Hz 높고, 리액턴스는 35-77kΩ 더 작게 측정되었다. 이 기술은 비침습 측정 시스템을 이용해서 활성점과 주변피부의 리액턴스와 특성주파수를 정확하고 객관적으로 분석되었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권5호
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• pp.910-924
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• 2010

As Internet usage has increased, the risk of adolescents being exposed to adult content and harmful information on the Internet has also risen. To help prevent adolescents accessing this content, a novel detection method for adult images is proposed. The proposed method involves three steps. First, the Image Of Interest (IOI) is extracted from the image background. Second, the IOI is distinguished from the segmented image using a novel weighting mask, and it is determined to be acceptable or unacceptable. Finally, the features (color and texture) of the IOI or original image are compared to a critical value; if they exceed that value then the image is deemed to be an adult image. A Receiver Operating Characteristic (ROC) curve analysis was performed to define this optimal critical value. And, the textural features are identified using a gray level co-occurrence matrix. The proposed method increased the precision level of detection by applying a novel weighting mask and a receiver operating characteristic curve. To demonstrate the effectiveness of the proposed method, 2850 adult and non-adult images were used for experimentation.

• 수면정신생리
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• 제8권1호
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• pp.67-71
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• 2001

Independent Component Analysis (ICA) is a blind source separation method using unsupervised learning and mutual information theory created in the late eighties and developed in the nineties. It has already succeeded in separating eye movement artifacts from human scalp EEG recording. Several characteristic sleep waves such as sleep spindle, K-complex, and positive occipital sharp transient of sleep (POSTS) can be recorded during sleep EEG recording. They are used as stage determining factors of sleep staging and might be reflections of unknown neural sources during sleep. We applied the ICA method to sleep EEG for sleep waves separation. Eighteen channel scalp longitudinal bipolar montage was used for the EEG recording. With the sampling rate of 256Hz, digital EEG data were converted into 18 by n matrix which was used as a original data matrix X. Independent source matrix U (18 by n) was obtained by independent component analysis method ($U=W{\timex}X$, where W is an 18 by 18 matrix obtained by ICA procedures). ICA was applied to the original EEG containing sleep spindle, K-complex, and POSTS. Among the 18 independent components, those containing characteristic shape of sleep waves could be identified. Each independent component was reconstructed into original montage by the product of inverse matrix of W (inv(W)) and U. The reconstructed EEG might be a separation of sleep waves without other components of original EEG matrix X. This result (might) demonstrates that characteristic sleep waves may be separated from original EEG of unknown mixed neural origins by the Independent Component Analysis (ICA) method.

• 제어로봇시스템학회논문지
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• 제15권5호
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• pp.525-529
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• 2009

Most of FLC received input data from error e and change-of-error e' with no relation with system complexity. Basic scheme follows typical PD and PI or PID Controller and that has been developed through fixed ME In this paper, We studied the relationship between MF and system response and system response through changing Fuzzy variable of consequence MF and propose the simple FLC using this relationship. The response of FLC is changed according to the width of Fuzzy variable of consequence MF. As changing the Fuzzy variable of consequence MF shows various nonlinear characteristic, we studied the relation between response and MF using analytical method. We designed the effective FLC using three-variable MF and nine rules and took simulation for verification. In this study, we propose the method to design system with FLC in stability point which is an impotent characteristic of designing system. The circle criterion which is adapted to analysis the nonlinear system is put to use for proposed method. Since SISO FLC has a time-invariant and odd characteristic we can use the critical point not disk which is generally used to determine the stability in the circle criterion, to determine the stability. Using this, we can get the maximum critical point plot of SISO FLC with changing the consequence fuzzy variables. The predetermined critical point plot of FLC can be used to decide the region of the system to be stable. This method is effectively used to design the SISO FLC.

• 전기전자학회논문지
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• 제7권2호
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• pp.210-217
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• 2003

본 논문에서는 수리형태학에 기반한 새로운 특징값 추출 방법을 제안하였다. 수리형태학적 패턴 분포함수에 의한 수리형태학적 공간주파수를 소개하고 이를 새로운 특징인 평균높이를 정의하는데 적용하였다. 평균높이는 내용기반 이미지 검색을 위한 인덱스 키를 생성하는데 사용되는 특징값을 정의하기 위하여 사용하였다. 제안한 방법의 우수성을 다양한 영상에 대한 실험을 통하여 증명하였다. 또한 기존의 검색방법은 검색하는 이미지 데이터마다 에지 검출단계에서 적절한 문턱값에 의한 이진화 처리가 요구되어 지나 제안한 방법은 이진화가 필요 없어서 그 효용성이 크다.

• Journal of Advanced Marine Engineering and Technology
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• 제25권1호
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• pp.107-114
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• 2001

Many simulation programs included intake and exhaust system on diesel engines have been developed. However, existing programs using 1-D numerical analytic methods in manifold gas flow by the method of characteristics have some problems to be solved.. Especially to optimzing the engine system, a simulation program which had more efficiency and accuracy is required newly. In this paper, a improved method for application limit and efficiency as well as mass conservation named constant mesh explicit method of characteristic was described. And some calculation results by this method were compared with experimental results and orther calculation results. Also, it was confirmed that the results by the proposed method were more agreed with experimental results.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 하계학술대회 논문집
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• pp.791-794
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• 2001

We described a method resonant mode identification in dielectric-disc loaded cylindrical cavity resonators. The characteristic equation is solved by using the ContourPlot graph of Mathematica. Contour graph method uses graphical method. It is comparable with numerical method. The numerical method is very difficult a mode identification. The analysis based on the approximated electromagnetic representation. This kinds of studies only concentrated on the calculation of resonant frequencies, and a mode identification of resonant frequencies have not been covered. But, the contour graph method to analyze the characteristic equations is simple and all parts of resonant frequency graph can be easily drawn, it is possible to calculate precise resonant frequencies and to identify the mode of resonant frequencies.

• 음성과학
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• 제15권3호
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• pp.7-15
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• 2008

This paper proposes the method to extract new feature vectors using the difference between the cepstrum for static characteristics and delta cepstrum for dynamic characteristics in speaker recognition (SR). The difference vector (DV) which it proposes from this paper is containing the static and the dynamic characteristics simultaneously at the intermediate characteristic vector which uses the deference between the static and the dynamic characteristics and as the characteristic vector which is new there is a possibility of doing. Compared to the conventional method, the proposed method can achieve new feature vector without increasing of new parameter, but only need the calculation process for the difference between the cepstrum and delta cepstrum. Experimental results show that the proposed method has a good performance more than 2.03%, on average, compared with conventional method in speaker identification (SI).