• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제15권4호
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• pp.265-269
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• 2009

정형명세기법은 안전최우선시스템 소프트웨어의 안전성을 일정 수준 이상 보장할 수 있는 기법으로서, 원자력 발전소의 디지털 제어시스템의 개발에 사용되고 있다. 정형명세기법 NUSCR로부터 Programmable Logic Controller(PLC) 시스템을 구현하기 위한 소프트웨어인 Function Block Diagram(FBD) 프로그램을 자동으로 생성하는 기법[1]이 개발되었으나, 이를 지원하는 자동화 도구가 없어 이 기법이 널리 사용되지 못하였다. 본 논문에서는 이어 자동생성 기법을 지원하기 위하여 개발된 자동화 도구 NuSCRtoFBD를 소개한다. 본 연구에서 제안하는 NuSCRtoFBD 도구를 사용하여 NuSCR로부터 FBD를 자동생성 함으로써, 기존의 수동 프로그래밍 작업에서 발생했던 다수의 오류들을 줄일 수 있다.

• Advances in biomechanics and applications
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• 제1권3호
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• pp.211-225
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• 2014

The usual assumption that the increase of fractures in aging bone is due entirely to lower bone density is taken back with respect to the possibility that aging bone fractures result from a loss of stability, or buckling, in the structure of the bone lattice. Buckling is an instability mode that becomes likely in end-loaded structures when they become too slender and lose lateral support. The relative importance of bone density and architecture in etiology bone fractures are poorly understood and the need for improved mechanistic understanding of bone failure is at the core of important clinical problems such as osteoporosis, as well as basic biological issues such as bone formation and adaptation. These observations motivated the present work in which simplified adaptive-beam buckling model is formulated within the context of the adaptive elasticity (Cowin and Hegedus 1976, Hegedus and Cowin 1976). Our results indicate that bone loss activation process leads systematically to the apparition of new elastic instabilities that can conduct to bone-buckling mechanism of fracture.

• 한국컴퓨터산업학회논문지
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• 제2권11호
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• pp.1365-1372
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• 2001

이 연구는 사용자의 브라우징 행위에 따라 자동적으로 하이퍼텍스트 네트워크를 재구성하는 세 가지 학습 규칙을 제안하고, 실험적 시스템을 구현하였다. 시스템은 링크 가중치를 하이퍼링크 네트워크에 부여하고 학습 규칙에 따라 가중치를 변경한다. 학습 규칙은 하이퍼링크가 얼마나 자주 이용되고 있는지에 따라 해당 하이퍼링크의 가중치만 변경되며, 다른 하이퍼링크에는 영향을 미치지 않는다. 네트워크 구조의 변경은 링크 가중치의 내림차순에 따라 동적으로 링크가 배열되어 사용자에게 제시된다. 이것은 협력 필터링 기술의 장점과 탐색 지원 접근 방식을 혼합한 것이다. 실험을 위해 임의적인 하이퍼텍스트 네트워크를 만들고 사용자의 브라우징 선호에 따라 네트워크 구조가 변화되는 과정을 관찰한다.

• 한국수산과학회지
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• 제14권3호
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• pp.171-178
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• 1981

1978년 5월에서 1980년 8월까지 알라스카만에사 한국 트룰어선의 어획물중에서 무작위 추출된 651마리의 적어를 사용하여 비늘 판독에 의해 성장을 연구하였다. 비늘에 형성되는 윤문은 눅역지수의 월변화에 의해 $2\sim5$월에 년 1회 형성되는 것으로 추정되었으므로 이윤문을 년윤으로 간주하였다. 표본어소의 윤경을 측정한 결과, 제1윤경을 제외한 전륜경에서 리현상이 확인되었고, 이 원인을 비늘의 수축에 의한 것으로 볼 수 없었으므로 산술평균법으로 리보정을 하여 윤문 형성시의 평균 수경을 추정하였다. 이 윤경으로 인경일체장 관계식을 사용하여 계산체장을 구해 버탈란피의 체장 성장식, $1_t=357.8(1-e^{-0.6124(t+1.8566)})$을 산출하였다. 이 식에 체장체중관계식을 침입하여 극한 체중($W_{\infty}=784.4g$)을 구하였다. 초기성장률 변화설을 검토한 결과, 그 원인이 초기 생활단계에서의 서식처 이동으로 인한 생태적 변화에 있기보다는 직선회귀법에 의한 리현상의 포정에 있을 가능성을 확인하였다.

• 한국통신학회논문지
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• 제32권5B호
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• pp.286-294
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• 2007

ASIP 디자인에서 디자인되는 프로세서의 성능을 측정할 수 있는 컴파일러가 요구된다. 머쉰에 맞는 컴파일러 설계는 매우 많은 시간을 요구한다. 본 논문은 MDL 기술로부터 C 컴파일러를 생성하는 시스템을 보인다. MDL을 이용한 컴파일러 생성은 user retargetability와 컴파일러와 프로세서 디자인의 일관성을 유지시켜 준다. 그러나 MDL을 이용한 컴파일러 생성 시스템은 컴파일러와 머쉰 간 의미적 차이를 줄여야 한다. 이러한 문제를 해결하기 위해 제안하는 시스템은 트리 패턴마다 행위정보를 가지는 라이브러리에 머쉰 행위기술을 맵핑한다. 맵핑된 인스트럭션과 레지스터 파일 사용정보를 이용해 제안하는 시스템은 컴파일러 후위부 interface function을 생성한다. 생성된 MIPS R3000와 ARM9 컴파일러가 C로 기술된 어플리케이션 프로그램으로 검증되었다.

• Journal of Mechanical Science and Technology
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• 제17권12호
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• pp.1969-1976
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• 2003

In the early phases of the product life cycle, Life Cycle Assessment (LCA) is recently used to support the decision-making for the product concepts, and the best alternative can be selected based on its estimated LCA and benefits. Both the lack of detailed information and time for a full LCA for a various range of design concepts need a new approach for the environmental analysis. This paper explores a new approximate LCA methodology for the product concepts by grouping products according to their environmental characteristics and by mapping product attributes into environmental impact driver (EID) index. The relationship is statistically verified by exploring the correlation between total impact indicator and energy impact category. Then, a neural network approach is developed to predict an approximate LCA of grouping products in conceptual design. Trained learning algorithms for the known characteristics of existing products will quickly give the result of LCA for newly designed products. The training is generalized by using product attributes for an EID in a group as well as another product attributes for the other EIDs in other groups. The neural network model with back propagation algorithm is used, and the results are compared with those of multiple regression analysis. The proposed approach does not replace the full LCA but it would give some useful guidelines for the design of environmentally conscious products in conceptual design phase.

• International Journal of Naval Architecture and Ocean Engineering
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• 제8권5호
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• pp.496-510
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• 2016

Simulation technology is a type of shipbuilding product lifecycle management solution used to support production planning or decision-making. Normally, most shipbuilding processes are consisted of job shop production, and the modeling and simulation require professional skills and experience on shipbuilding. For these reasons, many shipbuilding companies have difficulties adapting simulation systems, regardless of the necessity for the technology. In this paper, the data model for shipyard production simulation model generation was defined by analyzing the iterative simulation modeling procedure. The shipyard production simulation data model defined in this study contains the information necessary for the conventional simulation modeling procedure and can serve as a basis for simulation model generation. The efficacy of the developed system was validated by applying it to the simulation model generation of the panel block production line. By implementing the initial simulation model generation process, which was performed in the past with a simulation modeler, the proposed system substantially reduced the modeling time. In addition, by reducing the difficulties posed by different modeler-dependent generation methods, the proposed system makes the standardization of the simulation model quality possible.

• 대한인간공학회지
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• 제23권4호
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• pp.45-56
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• 2004

The purpose of this study is to evaluate perceived discomfort of working postures in terms of upper body (back, shoulder, and elbow) flexions when an external load varies. Eighteen subjects participated in an experiment of appraising perceived discomfort of varying upper body postures with three levels of external loads given. The ANOVA results showed that the perceived discomfort of upper body postures was significantly affected by the external load. It was also apparent that the interactions between external load and upper body posture were significant (p< 0.001). The result implies that a new posture classification scheme for workload assessment methods may be in need to reflect such interactions between external load and upper body posture. In order to support the statement, a regression model of perceived discomfort of upper body postures obtained from the experiment was developed and compared to that of perceived discomfort of seven work-related postures found in automobile assembly operations. The correlation coefficient between predicted and actual values of perceived discomfort was about 0.96. It is expected that the result help to properly estimate the body stress resluting from worker's postures and external loads and can be used as a valuable design guideline on preventing work-related musculoskeletal diseases in industry.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.610-614
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• 2005

Rock mass classification by using electrical resistivity tomography(ERT) method is widely performed for the determination of rock support type in tunnel design. In the region of high electrical noise level, however, the result of the ERT will have many erroneous features. In this study, the back ground electrical noise had been measured to find out the reason why the results of ERT in this area did not agree to the expected geology confirmed by boreholes. In order to overcome this limitation of ERT, a hybrid surface-borehole array seismic refraction tomography had been followed. Using this technique, we could get P-wave velocity section including the depth level of tunnel. The comparison of the P-wave velocity and RMR shows fairly good statistical relationship to make it possible to set up the rock mass classification for the entire tunnel line.

• 산업경영시스템학회지
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• 제2권2호
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• pp.11-18
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• 1979

The purpose of this study is to establish a purchasing cost reduction program for the management practical use. The research method of this study is a bibliographical search of the materials available in the library at Keimyung University and the writer's private study, and the case analysis. The body of this study is divided into three sections. The first section deals with the purchasing management systems in terms of the nature and characters of purchasing management and purchasing cost in total management system. The second section includes purchasing cost reduction program through value analysis technique and the third section covers summary and the following conclusions : 1) Top management should be aware of the important position of purchasing activities from the cost point of view, and they should be aware that a good purchasing cost reduction program could be established through value analysis technique. 2) For such a purchasing cost reduction program to be carried out. effectively the management should support and back up the program. 3) There should be a training program to educate and develop the personnel who can manage and operate the purchasing cost reduction program through valuean analysis technique. 4) And cooperative system should be established in management and operative organization system from the total management systems, view for the effective use of the program.