• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 제13회 신호처리 합동 학술대회 논문집
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• pp.375-378
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• 2000

In this paper, we propose a novo] content-based image retrieval system using both Hidden Markov Model(HMM) and an improved chain code. The Gaussian Mixture Model(GMM) is applied to statistically model a color information of the image, and Deterministic Annealing EM(DAEM) algorithm is employed to estimate the parameters of GMM. This result is used to segment the given image. We use an improved chain code, which is invariant to rotation, translation and scale, to extract the feature vectors of the shape for each image in the database. These are stored together in the database with each HMM whose parameters (A, B, $\pi$) are estimated by Baum-Welch algorithm. With respect to feature vector obtained in the same way from the query image, a occurring probability of each image is computed by using the forward algorithm of HMM. We use these probabilities for the image retrieval and present the highest similarity images based on these probabilities.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 전문대학교육위원
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• pp.176-179
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• 2005

In this paper, we propose the new method that separate the existing common VQ code book into two parts, one is the common VQ code book which is the half of existing common VQ code book, another is the personal speaker VQ code book which accommodate the personal speaker characteristic, variation to improve the performance of the text-dependent speaker verification system using discrete HMM. We apply the propose method m this paper to the text-dependent speaker verification system using discrete HMM and have the improvement performance of about 0.24% compared to existing method

• Journal of Positioning, Navigation, and Timing
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• 제1권1호
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• pp.1-6
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• 2012

For a Global Positioning System (GPS) receiver, it is known that a Vector Delay Locked Loop (DLL) in which the code signals of each satellite are tracked in parallel by using navigation results shows better performance in the aspect of the tracking accuracy and the robustness than that of a Scalar DLL. However, the quantitative analysis and the logical grounds for that performance enhancement of the Vector DLL are not sufficient. This paper, therefore, proposes the structure of the GPS receiver with the Vector DLL and analyzes the performance of it. The tracking and the positioning accuracy of the Vector DLL are theoretically analyzed and confirmed by simulation results. From the simulation results, it can be seen that the tracking and positioning accuracy has been improved about 30% in case that the receiver is static and the positioning is conducted for every Pre-detection Integration Time (PIT) while C/N0 is 45 dB-Hz.

• Fisheries and Aquatic Sciences
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• 제4권1호
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• pp.1-9
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• 2001

This paper describes a procedure extracting feature vector of a target cell more precisely in the case of identifying specified cell. The classification of object type is based on feature vector such as area, complexity, centroid, rotation angle, effective diameter, perimeter, width and height of the object So, the feature vector plays very important role in classifying objects. Because the feature vectors is affected by noises and holes, it is necessary to remove noises contaminated in original image to get feature vector extraction exactly. In this paper, we propose the following method to do to get feature vector extraction exactly. First, by Otsu's optimal threshold selection method and morphological filters such as cleaning, filling and opening filters, we separate objects from background an get rid of isolated particles. After the labeling step by 4-adjacent neighborhood, the labeled image is filtered by the area filter. From this area-filtered image, feature vector such as area, complexity, centroid, rotation angle, effective diameter, the perimeter based on chain code and the width and height based on rotation matrix are extracted. To prove the effectiveness, the proposed method is applied for yeast Zygosaccharomyces rouxn. It is also shown that the experimental results from the proposed method is more efficient in measuring feature vectors than from only Otsu's optimal threshold detection method.

• Interdisciplinary Bio Central
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• 제4권1호
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• pp.2.1-2.7
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• 2012

Introduction: Histone deacetylases (HDAC) are a class of enzymes that remove acetyl groups from ${\varepsilon}$-N-acetyl lysine amino acids of histone proteins. Their action is opposite to that of histone acetyltransferase that adds acetyl groups to these lysines. Only few HDAC inhibitors are approved and used as anti-cancer therapeutics. Thus, discovery of new and potential HDAC inhibitors are necessary in the effective treatment of cancer. Materials and Methods: This study proposed a method using support vector machine (SVM) to classify HDAC8 inhibitors and non-inhibitors in early-phase virtual compound filtering and screening. The 100 experimentally known HDAC8 inhibitors including 52 inhibitors and 48 non-inhibitors were used in this study. A set of molecular descriptors was calculated for all compounds in the dataset using ADRIANA. Code of Molecular Networks. Different kernel functions available from SVM Tools of free support vector machine software and training and test sets of varying size were used in model generation and validation. Results and Conclusion: The best model obtained using kernel functions has shown 75% of accuracy on test set prediction. The other models have also displayed good prediction over the test set compounds. The results of this study can be used as simple and effective filters in the drug discovery process.

• 한국항공우주학회지
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• 제45권10호
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• pp.892-897
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• 2017

무기체계 SW 개발 전반에 대한 규정인 방위사업청의 무기체계 SW 개발 및 관리 매뉴얼이 개정될 때마다 SW 신뢰성 및 품질향상을 위해 SW 신뢰성 시험의 수준과 범위를 상향하는 방향으로 변경됨에 따라 SW 신뢰성 시험은 SW 개발자에게 큰 부담이 되고 있다. 특히 동적시험은 무기체계 SW를 구현하는데 필요한 일정과 인력에 육박할 정도의 비용이 소요되고 있으며, 1회성으로 그치지 않고 소스코드 형상이 변경될 때마다 수행해야 한다. 본 논문에서는 동적시험 도구인 VectorCast를 이용하여 동적시험을 최초 1회 수행한 후 소스코드 형상변경으로 인한 동적시험 회귀시험 시 사람의 개입을 최소화하여 자동으로 회귀시험을 수행하고 결과 보고서를 생성해주는 회귀시험 자동화 프로그램인 VectorCast Environment Manager 개발에 대해서 기술한다.

• 한국정보통신학회논문지
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• 제24권7호
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• pp.956-962
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• 2020

최근 임베디드 시스템에서 사용되는 데이터의 크기가 증가함에 따라, 대용량의 데이터를 안전하게 수신하기 위한 ECC (Error Correction Code) 복호화 연산의 필요성이 강조되고 있다. 본 논문에서는 GPU가 내장된 임베디드 시스템에서 해밍 코드를 사용하여 ECC 복호화를 할 때, 신드롬 벡터를 계산하는 연산의 수행을 가속할 방법을 제안한다. 제안하는 가속화 방법은, 복호화 연산의 행렬-벡터 곱셈이 희소 행렬을 나타내는 자료 구조 중 하나인 CSR (Compressed Sparse Row) 형식을 사용하고, GPU의 CUDA 커널에서 병렬적으로 수행되도록 한다. 본 논문에서는 GPU가 내장된 실제 임베디드 보드를 사용하여 제안하는 방법을 검증하였고, 결과는 GPU 기반으로 가속된 ECC 복호화 연산이 CPU만을 사용한 경우에 비하여 수행 시간이 감소하는 것을 보여준다.

• 한국가시화정보학회지
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• 제10권3호
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• pp.42-47
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• 2012

Experimental data for the flows in a mixing tank with a bottom agitator are useful for the validation of CFD commercial code. A hybrid volume PIV measurement technique was constructed to measure the flows inside of the mixing tank. The measurement system consists of three cameras. An agitator was installed at the bottom of the tank and it rotates clockwise and counterclockwise. Using the constructed measurement system, instantaneous vector fields were obtained. A phase averaging technique was adopted for the measured instantaneous three-dimensional velocity vector fields. Turbulent properties were evaluated from the instantaneous vector fields.

• JSTS:Journal of Semiconductor Technology and Science
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• 제7권4호
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• pp.229-234
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• 2007

In this paper, we present an efficient instruction set architecture using vector register file hardware to accelerate operation of general matrix-vector operations in DSP microprocessor. The technique enables in-situ row-access as well as column access to the register files. It can reduce the number of memory access significantly. The technique is especially useful for block-based video signal processing kernels such as FFT/IFFT, DCT/IDCT, and two-dimensional filtering. We have applied the new instruction set architecture to in-loop deblocking filter processing in H.264 decoder. Performance comparisons show that the required load/store operations for the in-loop deblocking filter can be reduced about 42%. The architecture would improve the processing speed, and code density in DSP microprocessor especially for video signal processing substantially.

• 한국통신학회논문지
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• 제27권6B호
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• pp.610-615
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• 2002

이 논문에서는 변조된 신호 공간에서 신호 벡터에 적당한 부호를 부여하는 벡터 양자화기를 쓰는 레일리 감쇄채널을 위한 통신 시스템을 다루었다. 변조된 신호공간을 효율적으로 분할함으로써, 변조 신호 파형의 왜곡이 최소화되도록 벡터 양자화 부호화 시스템을 최적화하였다. 모의실험을 통해 최적화된 직교 진폭 변조기가 전체 통신시스템의 성능을 더 좋게함을 보였다.