• Title/Summary/Keyword: Pattern comparison

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Comparison Research of Filtration and Regeneration Characteristics of Ceramic Candle Filter System at Different Inflow Pattern of Dusty Gas (분진 유입 방식에 따른 세라믹 캔들 필터 집진장치의 집진 및 탈진 특성 비교 연구)

  • Park, Seok-Joo;Lim, Kyeong-Soo;Lim, Jeong-Hwan
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.341-344
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    • 2008
  • Computational studies have been performed to analyze the particle loadings onto the filters according to the different inflow pattern of dusty gas and the flow uniformities on the filter surface of back-blown gas at different permeability of porous media setup at the filter outlet. This is preliminary study to find how we can reduce the regeneration time and improve the regeneration efficiency of filters with dust layer.

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Finite Element Anlaysis of Nanoindentation Process and its Experimental Verification (나노 인덴테이션 공정의 유한요소해석 및 실험적 검증)

  • 이정우;윤성원;강충길
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.116-119
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    • 2003
  • In this study, to achieve the optimal conditions for mechanical hyper-fine pattern fabrication process, deformation behavior of the materials during indentation was studied with numerical method by ABAQUS S/W. Brittle materials (Si, Pyrex glass) were used as specimens, and forming conditions to reduce the elastic restoration and pile-up was proposed. The indenter was modeled a rigid surface. Minimum mesh sizes of specimens are 1-10nm Comparison between the experimental data and numerical result demonstrated that the finite element approach is capable of reproducing the loading-unloading behavior of a nanoindentation test. The result of the investigation will be applied to the fabrication of the hyper-fine pattern.

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Ellipsoid Fuzzy-ART for Pattern Recognition Improvement (패턴인식을 위한 타원형 Fuzzy-ART)

  • 강성호;정성부;임중규;이현관;엄기환
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2003.05a
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    • pp.305-308
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    • 2003
  • This paper proposed Ellipsoid Fuzzy-ART (Fuzzy-Adaptive Resonance Theory) for recognition performance improvement to use Mahalanobis distance. The suggested method uses Mahalanobis distance to decide pattern boundary region at vector space. In order to confirm the validity of proposed method, comparison of the performance has made between existing method and the proposed method through simulation.

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Comparison of Information Use Pattern between Some Scientists and Social Scientists (자연과학 및 사회과학 연구자들의 정보이용특성 분석)

  • 최은주
    • Journal of the Korean Society for information Management
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    • v.14 no.1
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    • pp.27-45
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    • 1997
  • This study is intended to investigate and analyze overall information use pattern of researchers and scholars in the field of science and social science, and compare the information use habits between two groups. 300 questionnaires were sent out to 7 major libraries or information centers in the field, and 217 questionnaires were returned. Five hypotheses were tested based on the assumption that there would exist some differences between two groups in their information use pattern. Some commonalities a d differences were revealed as the findings of the study.

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Object recognition of one D.O.F. tools by a backpropagation neural network (신경회로망을 이용한 물체 인식)

  • 김흥봉;남광희
    • 제어로봇시스템학회:학술대회논문집
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    • 1991.10a
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    • pp.996-1001
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    • 1991
  • We consider the object recognition of industrial tools which have one degree of freedom. In the case of pliers, the shape varies as the jaw angle varies. Thus, a feature vector made from the boundary image also varies along with the jaw angle. But a pattern recognizer should have the ability of classifying objects without any regards to the angle variation. For a pattern recognizer we have utilized a backpropagation neural net. Feature vectors were made from Fourier descriptors of boundary images by truncating the high frequency components, and they were used as inputs to the neural net for training and recognition. In our experiments, backpropagation neural net outperforms the minimum distance rule which is widely used in the pattern recognition. The performance comparison also made under noisy environments.

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A Study on the Sizes for Children's Slacks Pattern Making (아동용바지 원형제작을 위한 Size 설정에 관한 연구 - 6세~8세 아동을 중심으로 -)

  • 이형숙
    • Journal of the Korean Home Economics Association
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    • v.20 no.3
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    • pp.25-34
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    • 1982
  • The manufacture of children's wear is another part of the giant industry. However, the production of children's wear remains a small factory operation without scientific study. This study is aimed at establishing the normal sizes for slacks pattern making of 6∼8 years old children. The sample were classified into 5 groups of stature. The findings are as follows: 1) In analysis of stature group 110∼115cm to 130∼135cm there were almost significant differences of the mean values of all items. Comparison of physique shows even variation between stature group. 2) The correlation among all the parts of the body is strong in the case of the Stature. 3) The result of regression analysis is as follows. In slacks pattern making Back Waist Height and Slacks Length were exactly determined by Stature. Waist to Knee were exactly determined by Slacks Length.

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Analysis of Material Deformation Behavior in Nanoindentation Process by using 3D Finite Element Analysis and its Experimental Verification (3차원 유한요소해석을 이용한 나노인덴테이션 공정에서의 소재거동해석 및 실험적 검증)

  • 이정우;윤성원;강충길
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1174-1177
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    • 2003
  • In this study, to achieve the optimal conditions for mechanical hyper-fine pattern fabrication process, deformation behavior of the materials during indentation was studied with numerical method by ABAQUS S/W. Polymer (PMMA) and brittle materials (Si, Pyrex glass) were used as specimens, and forming conditions to reduce the elastic recover and pile-up was proposed. The indenter was modeled a 3D rigid surface. Minimum mesh sizes of specimens are 1-10nm. Comparison between the experimental data and numerical result demonstrated that the finite element approach is capable of reproducing the loading-unloading behavior of a nanoindentation test. The result of the investigation will be applied to the fabrication of the hyper-fine pattern.

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Implementation of Real Time System for Personal Identification Algorithm Utilizing Hand Vein Pattern (정맥패턴을 이용한 개인식별 알고리즘의 고속 하드웨어 구현)

  • 홍동욱;임상균;최환수
    • Proceedings of the IEEK Conference
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    • 1999.11a
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    • pp.560-563
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    • 1999
  • In this paper, we present an optimal hardware implementation for preprocessing of a person identification algorithm utilizing vein pattern of dorsal surface of hand. For the vein pattern recognition, the computational burden of the algorithm lies mainly in the preprocessing of the input images, especially in lowpass filtering. we could reduce the identification time to one tenth by hardware design of the lowpass filter compared to sequential computations. In terms of the computation accuracy, the simulation results show that the CSD code provided an optimized coefficient value with about 91.62% accuracy in comparison with the floating point implementation of current coefficient value of the lowpass filter. The post-simulation of a VHDL model has been performed by using the ModelSim$^{TM}$. The implemented chip operates at 20MHz and has the operational speed of 55.107㎳.㎳.

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The Performance Comparison of Classifier Algorithm for Pattern Recognition of Welding Flaws (용접결함의 패턴인식을 위한 분류기 알고리즘의 성능 비교)

  • Yoon, Sung-Un;Kim, Chang-Hyun;Kim, Jae-Yeol
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.3
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    • pp.39-44
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    • 2006
  • In this study, we nodestructive test based on ultrasonic test as inspection method and compared backpropagation neural network(BPNN) with probabilistic neural network(PNN) as pattern recognition algorithm of welding flasw. For this purpose, variables are applied the same to two algorithms. Where, feature variables are zooming flaw signals of reflected whole signals from welding flaws in time domain. Through this process, we confirmed advantages/disadvantages of two algorithms and identified application methods of two algorithms.

PROPOSAL OF AMPLITUDE ONLY LOGARITHMIC RADON DESCRIPTER -A PERFORMANCE COMPARISON OF MATCHING SCORE-

  • Hasegawa, Makoto
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2009.01a
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    • pp.450-455
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    • 2009
  • Amplitude-only logarithmic Radon transform (ALR transform) for pattern matching is proposed. This method provides robustness for object translation, scaling, and rotation. An ALR image is invariant even if objects are translated in a picture. For the object scaling and rotation, the ALR image is merely translated. The objects are identified using a phase-only matched filter to the ALR image. The ratio of size, the difference of rotation angle, and the position between the two objects are detected. Our pattern matching procedure is described, herein, and its simulation is executed. We compare matching scores with the Fourier-Mellin transform, and the general phase-only matched filter.

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