• Journal of Preventive Medicine and Public Health
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• 제24권3호
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• pp.373-389
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• 1991

In order to develop the measuring tool of VDT syndrome and investigate the variables affecting the development of VDT syndrome, a questionnaire study accompanied with the evaluation of working environment was performed with 138 VDT users from six public organs in Kwangju area. The results were summarized as follows. 1. As a result of analysis with data collected by newly developed questionnaire, VDT syndrome included five factors named as eye-related component, psychological component, general body component, musculoskeletal component, and skin-related component and the estimates of the internal consistency of five factors were 0.877, 0.820, 0.796, 0.791, 0.593 respectively. 2. Variables affecting the level of eye-related symptoms were the type of main b using VDT, the total time of VDT operation per day, and the use of external filter on CRT. 3. The level of eye-related symptoms in the group using external filter was higher significantly than that in the group not using filter. 4. The past history of severe illness affected the level of psychological symptoms significantly. 5. Variables affecting the level of general body symptoms were b satisfaction and income satisfaction. 6. Variables affecting the level of musculoskeletal symptoms were the type of main job using VDT, whether majored in EDPS, the level of typewriting, b satisfaction, and the total time of VDT operation per day. 7. Age and the use of external filter were significantly related to the level of skin-related symptoms.

• 대한수학회보
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• 제50권5호
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• pp.1441-1450
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• 2013

In this paper, we consider two-component Bose-Einstein condensates with an internal atomic Josephson junction in the general case, i.e., 0 < p < $\frac{2}{(d-2)^+}$. We prove existence and uniqueness results for the ground states, and obtain some properties of the ground states with large parameters.

• 정보처리학회논문지D
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• 제9D권4호
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• pp.613-618
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• 2002

이미 존재하는 기능의 조각인 컴포넌트를 조림함으로써 시스템의 개발 시간과 비용을 줄이고, 소프트웨어의 품질과 생산성을 향상시키고자 하는 컴포넌트 기반 개발 방법론이 새로운 재사용 기술로 나타나기 시작했다. 컴포넌트 기반 시스템은 컴포넌트의 조합으로 구성되기 때문에 개별 컴포넌트의 품질에 의해 영향을 받는다. 그러므로, 개발될 컴포넌트 시스템의 품질을 향상시키기 위해서는, 조림될 개별 컴포넌트의 품질에 대한 측정이 필요하다. 따라서, 본 논문에서는 컴포넌트 인터페이스와 내부의 클래스 또는 클래스들 사이의 관련성으로 컴포넌트 응집성을 측정하는 메트릭스를 제안한다. 이는 소프트웨어 개발 주기의 초기인 분석단계에 적용하여, 향후 개발될 컴포넌트의 기능적 응집 정도를 측정해 볼 수 있다. 컴포넌트의 기능 독립성을 예측 가능함으로써, 소프트웨어 개발에 대한 노력을 줄일 수 있으며 컴포넌트 재사용을 통한 시스템의 품질 향상을 가져올 수 있는 효과를 기대할 수 있다.

• 정보처리학회논문지D
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• 제9D권4호
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• pp.619-628
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• 2002

소프트웨어 부품화는 소프트웨어 개발에 있어서의 궁극적인 목표이다. 컴포넌트 기반의 개발은 이러한 재사용의 초점을 코드에 의한 수동적인 조작이나, 클래스 라이브러리보다 발전된 형태인 컴포넌트에 초점을 두고 있다. 컴포넌트 구축은 컴포넌트 모델에 적합한 새로운 소프트웨어 컴포넌트를 재개발 해야하는 비효율성으로 인해 추가적인 노력과 비용을 야기 시킨다. 최근 많이 사용되고 있는 자바 응용시스템의 경우 자바 언어 기반의 컴포넌트 모델이 존재하지만, 소규모의 재사용 단위나 제한된 GUI 컴포넌트 개발에만 머무르고 있어, 컴포넌트로의 기능을 충분히 발휘하지 못하거나 추가적인 비용, 노력이 필요하며 또한 특정 도메인 컴포넌트에서만 제한적이다는 단점이 있다. 따라서, 본 논문에서는 기존의 자바로 개발된 응용시스템을 기반 하여 자바의 컴포넌트 모델인 자바빈즈를 적용하기 위해, 컴포넌트를 확장 추출하고, 재사용단위로서 비즈니스 로직의 부분적인 수용을 통해 이 응용시스템에서의 자바빈즈로 변환하는 프로세스를 제시하고 알고리즘을 제안한다.

• Structural Engineering and Mechanics
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• 제10권1호
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• pp.81-92
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• 2000

This study is an investigation of the effect of cracks on the dynamical characteristics of a cantilever beam, having multiple open-edge transverse cracks. The flexibilities due to crack have been identified for several crack depths and locations. In the study the finite element method and component mode synthesis methods are used. Coupling the components is performed by a flexibility matrix taking into account the interaction forces. Each component is modelled by cantilever beam finite elements with two nodes and three degrees of freedom at each node. The results obtained lead to conclusion that, by using the drop in the natural frequencies and the change in the mode shapes, the presence and nature of cracks in a structure can be detected. There is some counter-evidence, however, that the effects due to multiple cracks may interact to make detection more difficult than for isolated cracks.

• Fibers and Polymers
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• 제2권4호
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• pp.184-189
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• 2001

Continuous photografting/crosslinking of polyethyleneglycol dimethacrylate oligomers onto cotton using a water-soluble benzophenone photoinitiator was investigated. Photografting increased with increasing irradiation dose, oligomer concentration and photoinitiator concentration. Maximum grafting efficiency of DM 400 and 600 were 83% and 79%, respectively. the photografting increased the wrinkle resistance of cotton implying surface crosslinking of cotton. bothsurface crosslinking and bulk crosslinking of cotton were accomplished via dual curing of a mixed formulation containing both a thermally curable component (BTCCA/SHP) and a UV-curable component. The wrinkle resistance of the crosslinked cotton was found to be higher when cured by thermal curing due to the facile post-polymerization of the UV active component. The presence of crosslinks in the dually crosslinked cotton was verified with FT-IR and thermogravimetric analysis.

• 대한산업공학회지
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• 제40권3호
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• pp.275-282
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• 2014

One of the most widely used methods for dimensionality reduction is principal component analysis (PCA). However, the reduced dimensions from PCA do not provide a clear interpretation with respect to the original features because they are linear combinations of a large number of original features. This interpretation problem can be overcome by feature selection approaches that identifying the best subset of given features. In this study, we propose an unsupervised feature selection method based on the geometrical information of PCA loading vectors. Experimental results from a simulation study demonstrated the efficiency and usefulness of the proposed method.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2004년도 추계 종합학술대회 논문집
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• pp.408-411
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• 2004

본 논문에서는 컴포넌트의 메소드 호출이나 변경 없이 조립하기위해 본 논문에서는 컴포넌트를 연결하는 커넥터를 자동생성에 관한 연구를 하였다. 커넥터는 컴포넌트 포트의 정의, 명세와 아키텍처 구조에 의해 자동으로 생성이 된다. 생성된 커넥터를 통해 컴포넌트가 조립이 되는 것이다.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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• pp.46-53
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• 2006

This paper presents the fault diagnosis of induction motor based on support vector machine (SVMs). SVMs are well known as intelligent classifier with strong generalization ability. Application SVMs using kernel function is widely used for multi-class classification procedure. In this paper, the algorithm of SVMs will be combined with feature extraction and reduction using component analysis such as independent component analysis, principal component analysis and their kernel (KICA and KPCA). According to the result, component analysis is very useful to extract the useful features and to reduce the dimensionality of features so that the classification procedure in SVM can perform well. Moreover, this method is used to induction motor for faults detection based on vibration and current signals. The results show that this method can well classify and separate each condition of faults in induction motor based on experimental work.

• 한국정보처리학회논문지
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• 제7권4호
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• pp.1092-1102
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• 2000

In this paper, we made software components reusable through syntax-analysis method, designed a Viewer for understanding component information, and retrieved similar components by using Enhanced SARM. Because SARM requires a lot of computation time, it was enhanced by reducing unnecessary activation value. Also GUI was designed for component-query relationship and Viewer represents hierarchy diagram of a retrieved component. This system supports facilities which can insert and delete components on diagram. For a component modification, this system supports a editor to rebuild class inheritance relationship. In this paper, SCRS (software components reuse system) is consisted of syntax-analysis method, component-query relationship interface, retrieval (Enhanced SARM), diagram viewer, reuse on diagram, and a editor.