• Title/Summary/Keyword: component method

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A Study of Automatic Medical Image Segmentation using Independent Component Analysis (Independent Component Analysis를 이용한 의료영상의 자동 분할에 관한 연구)

  • Bae, Soo-Hyun;Yoo, Sun-Kook;Kim, Nam-Hyun
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.52 no.1
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    • pp.64-75
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    • 2003
  • Medical image segmentation is the process by which an original image is partitioned into some homogeneous regions like bones, soft tissues, etc. This study demonstrates an automatic medical image segmentation technique based on independent component analysis. Independent component analysis is a generalization of principal component analysis which encodes the higher-order dependencies in the input in addition to the correlations. It extracts statistically independent components from input data. Use of automatic medical image segmentation technique using independent component analysis under the assumption that medical image consists of some statistically independent parts leads to a method that allows for more accurate segmentation of bones from CT data. The result of automatic segmentation using independent component analysis with square test data was evaluated using probability of error(PE) and ultimate measurement accuracy(UMA) value. It was also compared to a general segmentation method using threshold based on sensitivity(True Positive Rate), specificity(False Positive Rate) and mislabelling rate. The evaluation result was done statistical Paired-t test. Most of the results show that the automatic segmentation using independent component analysis has better result than general segmentation using threshold.

A Study on the Identification and Improvement of Dynamic Characteristics of Large Structure by Component Mode Synthesis Method (부분 구조합성법을 이용한 대형구조물의 동특성 규명 및 개선에 관한 연구)

  • 오재응;이정환;임동규
    • Journal of KSNVE
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    • v.4 no.3
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    • pp.327-335
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    • 1994
  • In this paper, to identify the dynamic characteristics of antenna system, the antenna is divided into 4 components and those were analyzed with a conventional FEM package MSC/NASTRAN. Using a Component Mode Synthesis Method, dynamic characteristics of total system is also identified. The Coherence of each component to total system is evaluated by using strain and kinetic component to total system is evaluated by using strain and kinetic energy. The improving strategy of dynamic characteristics is suggested by changing mass and stiffness of large coherence components.

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Vibration Analysis of a Refrigerator Using Component Synthesis Method (부분구조합성법을 이용한 냉장고의 진동해석)

  • 김석관;김성대;임기수
    • Journal of KSNVE
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    • v.3 no.3
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    • pp.253-257
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    • 1993
  • In this study, vibration analysis of a refrigerator was carried out to reduce vibration induced noise. When the components of a machine are assembled together, the natural frequencies of each component are changed since they have influences on one another. To avoid the problem of resonance, the vibration characteristics of each component must be checked systematically after they are designed. For this purpose, vibration analysis of a refrigerator was done using a component synthesis method. The experimental and analytical results showed good agreement and are presented here.

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The highly sensitive NO2 gas sensor using ZnO nanorods grown by the sol-gel method (졸-겔법으로 증착된 ZnO 나노막대를 이용한 고감도 이산화질소 가스 센서 제작 및 특성 연구)

  • Park, S.J.;Kwak, J.H.;Park, J.;Lee, H.Y.;Moon, S.E.;Park, K.H.;Kim, J.;Kim, G.T.
    • Journal of Sensor Science and Technology
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    • v.17 no.2
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    • pp.147-150
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    • 2008
  • Multiple ZnO nanorod device detecting $NO_2$ gas was fabricated by sol-gel growth method and gas response characteristics were measured as a chemical gas sensor. The device is mainly composed of sensing electrode and sensing nano material. To acquire high sensitivity of the device for $NO_2$ gas it was heated by a heat chuck up to $400^{\circ}C$ The sensing part was easily made using the CMOS compatible process, for example, the large area and low temperature nano material growth process, etc. The sensors were successfully demonstrated and showed high sensitive response for $NO_2$ gas sensing.

Principal component regression for spatial data (공간자료 주성분분석)

  • Lim, Yaeji
    • The Korean Journal of Applied Statistics
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    • v.30 no.3
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    • pp.311-321
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    • 2017
  • Principal component analysis is a popular statistical method to reduce the dimension of the high dimensional climate data and to extract meaningful climate patterns. Based on the principal component analysis, we can further apply a regression approach for the linear prediction of future climate, termed as principal component regression (PCR). In this paper, we develop a new PCR method based on the regularized principal component analysis for spatial data proposed by Wang and Huang (2016) to account spatial feature of the climate data. We apply the proposed method to temperature prediction in the East Asia region and compare the result with conventional PCR results.

An Effective Method of Sharing Heterogeneous Components of OPRoS and RTM

  • Salov, Andrey D.;Park, Hong Seong;Han, Soohee;Lee, Dooam
    • Journal of Electrical Engineering and Technology
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    • v.9 no.2
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    • pp.755-761
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    • 2014
  • Heterogeneous components have different component models, which prevents such components from sharing the functionalities of other components based on the different models. As one of methods for linking heterogeneous components, this paper suggests a proxy component to construct a bridge between heterogeneous components of OPRoS (Open Platform for Robotic Service) and RTM (Robot Technology Middleware). The proxy component consists of two types of components called Adaptor and Interceptor, via which the heterogeneous components can exchange data and services easily. The proposed method enables adaptor and interceptor components to directly invoke the services of the latter and the former, respectively, in order to exchange data and services on a real-time basis. The proxy component can be implemented for OPRoS and RT (Robot Technology) component models to connect with RT and OPRoS ones, respectively. It is shown through a simple experiment that the proposed method works well for real-time control.

Application of the Principal Component Analysis to Evaluate Concrete Condition Using Impact Resonance Test (충격공진을 이용한 콘크리트 상태 평가를 위한 주성분 분석의 적용)

  • Yoon, Young Geun;Oh, Tae Keun
    • Journal of the Korean Society of Safety
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    • v.34 no.5
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    • pp.95-102
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    • 2019
  • Non-destructive methods such as rebound hardness method and ultrasonic method are widely studied for evaluating the physical properties, condition and damage of concrete, but are not suitable for detecting delamination and cracks near the surface due to various constraints of the site as well as the accuracy. Therefore, in this study, the impact resonance method was applied to detect the separation cracks occurring near the surface of the concrete slab and bridge deck. As a next step, the principal component analysis were performed by extracting various features using the FFT data. As a result of principal component analysis, it was analyzed that the reliability was high in distinguishing defects in concrete. This feature extraction and application of principal component analysis can be used as basic data for future use of machine learning technique for the better accuracy.

A Search Method for Components Based-on XML Component Specification (XML 컴포넌트 명세서 기반의 컴포넌트 검색 기법)

  • Park, Seo-Young;Shin, Yoeng-Gil;Wu, Chi-Su
    • Journal of KIISE:Software and Applications
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    • v.27 no.2
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    • pp.180-192
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    • 2000
  • Recently, the component technology has played a main role in software reuse. It has changed the code-based reuse into the binary code-based reuse, because components can be easily combined into the developing software only through component interfaces. Since components and component users have increased rapidly, it is necessary that the users of components search for the most proper components for HTML among the enormous number of components on the Internet. It is desirable to use web-document-typed specifications for component specifications on the Internet. This paper proposes to use XML component specifications instead of HTML specifications, because it is impossible to represent the semantics of contexts using HTML. We also propose the XML context-search method based on XML component specifications. Component users use the contexts for the component properties and the terms for the values of component properties in their queries for searching components. The index structure for the context-based search method is the inverted file indexing structure of term-context-component specification. Not only an XML context-based search method but also a variety of search methods based on context-based search, such as keyword, search, faceted search, and browsing search method, are provided for the convenience of users. We use the 3-layer architecture, with an interface layer, a query expansion layer, and an XML search engine layer, of the search engine for the efficient index scheme. In this paper, an XML DTD(Document Type Definition) for component specification is defined and the experimental results of comparing search performance of XML with HTML are discussed.

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Improvement on Performance Simulation Using Component Maps of Aircraft Gas Turbine Obtained from System Identification (시스템 식별로 구한 구성품 성능선도를 이용한 개선된 가스터빈 성능해석 연구)

  • Kong, Chang-Duk;Kho, Seong-Hee;Ki, Ja-Young
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.6
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    • pp.96-103
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    • 2004
  • Sought a set of component performance lines from experiment data or some data supplied in the engine manufacturer to improve the traditional scaling method and suggested a map scaling method that construct component performance lines newly using polynomial equations of MATLAB program. In this study, applied technique that is proposed newly to PT6A-62 that verified technique that is proposed newly using experiment data of small. size turboshaft engine, and is actuality aircraft engine. In identification of the component maps of the turboprop engine, the simulated performance using the proposed scaling method was compared with the real engine performance data and the performance using the traditional scaling method.

A General Semiparametric Additive Risk Model

  • Park, Cheol-Yong
    • Journal of the Korean Data and Information Science Society
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    • v.19 no.2
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    • pp.421-429
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    • 2008
  • We consider a general semiparametric additive risk model that consists of three components. They are parametric, purely and smoothly nonparametric components. In parametric component, time dependent term is known up to proportional constant. In purely nonparametric component, time dependent term is an unknown function, and time dependent term in smoothly nonparametric component is an unknown but smoothly function. As an estimation method of this model, we use the weighted least square estimation by Huffer and McKeague (1991). We provide an illustrative example as well as a simulation study that compares the performance of our method with the ordinary least square method.

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