• International Journal of Fuzzy Logic and Intelligent Systems
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• 제15권2호
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• pp.121-125
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• 2015

In this paper, we propose a method that extracts features from character patterns using the fractal dimension of chaos theory. The input character pattern image is converted into time-series data. Then, using the modified Henon system suggested in this paper, it determines the last features of the character pattern image after calculating the box-counting dimension, natural measure, information bit, and information (fractal) dimension. Finally, character pattern recognition is performed by statistically finding each information bit that shows the minimum difference compared with a normalized character pattern database.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권3호
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• pp.305-323
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• 2010

This paper proposes an efficient and yet powerful local descriptor called phase-space partition based descriptor (PPD). This descriptor is designed for the mobile image matching and retrieval. PPD, which is inspired from SIFT, also encodes the salient aspects of the image gradient in the neighborhood around an interest point. However, without employing SIFT's smoothed gradient orientation histogram, we apply the region based gradient statistics in phase space to the construction of a feature representation, which allows to reduce much computation requirements. The feature matching experiments demonstrate that PPD achieves favorable performance close to that of SIFT and faster building and matching. We also present results showing that the use of PPD descriptors in a mobile image retrieval application results in a comparable performance to SIFT.

• Journal of applied mathematics & informatics
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• 제15권1_2호
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• pp.425-434
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• 2004

Pattern recognition in three dimensional image is highly sensitive to assigned value and formation of voxels (pixels for two dimension case). However, occurred while digital imaging, digitization error leads to unpredictable noises in image data. Skeletonization, a powerful tool of pattern recognition, is sensitively dependent on boundary formation. Without successful controlling of the noises, the results of skeletonization can not be allowed as a stable solution. To minimize the effect of noises affecting to boundary formation, we developed a robust processing method useful in skeletonization technique for pattern recognition. Finally, we provide rigorous test results achieved throughout simulation on analytic three dimensional image.

• International Journal of CAD/CAM
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• 제8권1호
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• pp.69-72
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• 2009

In this paper, we present a new shape descriptor, which is named Poisson equation-Fourier-Mellin moment Descriptor. We solve the Poisson equation in the shape area, and use the solution to get feature function, which are then integrated using Fourier-Mellin moment to represent the shape. This method develops the Poisson equation-geometric moment Descriptor proposed by Lena Gorelick, and keeps both advantages of Poisson equation-geometric moment and Fourier-Mellin moment. It is proved better than Poisson equation-geometric moment Descriptor in shape recognition and classification experiments.

• Journal of Information Processing Systems
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• 제13권5호
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• pp.1043-1051
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• 2017

• Journal of Information Processing Systems
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• 제13권6호
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• pp.1431-1435
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• 2017

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.681-684
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• 2015

자성체의 자화는 자성물리의 기본 물리량으로 자성체 응용에 많은 정보를 제공한다. 광자기효과를 이용하는 자구관찰 장치에서 최초로 얻어지는 자화패턴 만으로는 자성체의 자화상태를 확인할 수 없다. 따라서 자구패턴을 시각화하기 위해 다수의 패턴을 획득하여 연산을 통해 자구패턴을 시각화하였다. 자화패턴을 8비트 디지털 카메라로 취득하였고 이를 컴퓨터로 화상 연산처리를 하였다. 연상방법은 자성체를 포화시켜 픽셀값을 최대 255값에 가깝게 하여 취득한 영상으로부터 어떤 자화상태의 자화영상의 픽셀값을 반복적으로 감산하는 것이다. 감산 연산이 진행됨에 따라 선명한 자구패턴이 얻어졌다. 연산 프로그램은 범용의 LABVIEW를 이용하였고 자구관찰장치는 편광자를 가지는 광학현미경을 이용하였다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2009년도 추계학술발표대회
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• pp.767-768
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• 2009

현재 웹상에서 데이터 표현을 위한 XML의 사용이 늘어나면서, XML 문서의 효율적인 질의 처리에 대한 관심이 증가하고 있다. 기존에 질의 처리 연구는 단일 경로에 대한 질의 처리가 연구되었고, 최근에는 두 개 이상의 경로를 가지는 Twig Pattern 질의 처리 연구가 이루어졌다. 따라서 본 논문에서는 기존에 제안된 기법들 보다 효율적으로 Twig Pattern 질의 처리를 할 수 있는 O-TJFast (Optimal TJFast) 기법을 제안한다. 또한, 본 논문에서는 XML 문서의 파싱(parsing)시 제공되는 정보를 가공하여 스트림과 포인터 구조를 얻어내어 기존에 제안된 기법들 보다 입출력 시간(I/O Time)과 처리 시간(Execution Time)을 효율적으로 감소시킬 수 있는 기법을 제안한다. 그리고 성능평가를 통해 제안한 기법이 처리시간에 많은 이득을 볼 수 있음을 보인다.

• 소성∙가공
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• 제22권1호
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• pp.36-41
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• 2013

The present study examines the micro-pattern replication on a plastic film using ultrasonic imprinting. Ultrasonic imprinting uses ultrasonic waves to generate repetitive microscale deformation in the polymer film. The resulting deformation heat on the surface of the film causes the surface region to soften sufficiently so that a replication of the micro-pattern can be obtained. To successfully replicate the micro-pattern on a large area of polymer film, a high replication ratio is needed as well as good uniformity over the entire region. In this study, a horn design is investigated by finite element analysis and is optimized through a response surface analysis. In the ultrasonic imprinting experiments, the response surface method was also used to determine the optimal processing conditions for better replication characteristics.

• International Journal of Precision Engineering and Manufacturing
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• 제1권1호
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• pp.106-110
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• 2000

The researches classifying the artificial flaws in welding parts are performed using the pattern recognition technology. For this purpose the signal pattern recognition package including user defined function is developed and the total procedure is made up the digital signal processing, feature extraction, feature selection, classfier design. Specially it is composed with and discussed using the ststistical classfier such as the linear discriminant function classfier, the empirical Bayesian classfier.