• Asia pacific journal of information systems
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• 제7권1호
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• pp.99-111
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• 1997

This paper presents an application of an artificial neural net to the implementation of decision class analysis (DCA), together with the generation of a decision model influence diagram. The diagram is well-known as a good tool for knowledge representation of complex decision problems. Generating influence diagram model is known to in practice require much time and effort, and the resulting model can be generally applicable to only a specific decision problem. In order to reduce the burden of modeling decision problems, the concept of DCA is introduced. DCA treats a set of decision problems having some degree of similarityz as a single unit. We propose a method utilizing a feedforward neural net with supervised learning rule to develop DCA based on influence diagram, which method consists of two phases: Phase l is to search for relevant chance and value nodes of an individual influence diagram from given decision and specific situations and Phase II elicits arcs among the nodes in the diagram. We also examine the results of neural net simulation with an example of a class of decision problems.

• 드라이브 ㆍ 컨트롤
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• 제12권4호
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• pp.15-20
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• 2015

Unlike a typical metal spring, a gas spring uses compressed gas contained in a cylinder and compressed by a piston to exert a force. A common application includes automobiles where gas spring are incorporated into the design of open struts that support the weight of tail gate. They are also used in furniture such as office chairs, and in medical and aerospace applications. The gas spring works by the application of pressurized gas (nitrogen) contained in a cylinder. The internal pressure of the gas spring greatly exceeds atmospheric pressure. This differential in pressure exists at any rod position and generates an outward force on the rod, making the gas spring extend. In this paper, we investigated the dynamic characteristics of a gas spring on an automotive tail gate system.

• 한국건축시공학회지
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• 제11권1호
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• pp.1-8
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• 2011

기존의 선형 공정계획은 마스터 스케쥴과 같이 작업분류체계의 대분류 레벨의 작업을 사선의 형태로 표현하는 데 국한하고 수작업으로 작성하였다. 즉, 네트워크 공정표의 정보를 활용하지 못하고 독립적으로 선형 공정표를 작성하여 보고용 또는 전체 공정계획 확인용으로 사용하고 있는 실정이다. 따라서 기존에 축적된 자료가 많은 네트워크 공정표를 기반으로 선형 공정표를 자동으로 생성할 수 있는 시스템 개발이 필요하다. 이에 본 연구는 선형 공정표 구현을 위한 데이터 프로세스 모델, 데이터 플로 다이어그램, 데이터모델을 구축하고 시스템 프로토 타입의 시스템 솔류션 구조, 클래스 다이어그램, 데이터 타입스키마를 개발하고자 한다. 즉, 네트워크 공정표를 선형 공정표로 변환하기 위한 시스템 프로토타입 개발의 선행 연구를 수행하는 것이 본 연구의 목적이다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제26권9호
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• pp.1105-1113
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• 1999

객체 지향 소프트웨어의 확장과 더불어 소프트웨어의 재사용성의 중요도가 부각되면서 소프트웨어를 콤포넌트 단위로 구현하는 추세이다. 따라서 콤포넌트 기반의 소프트웨어 개발에서의 통합 테스트가 중요한 이슈로 떠오르고 있다. 그러나 콤포넌트들의 통합 테스트에 대한 연구는 미흡한 상태이다. 본 논문에서는 UML을 기반으로 체계적인 통합 테스트 모형을 제안하고. 나아가 본 논문에서는 "멀티미디어 정보처리 시스템"의 사례를 본 논문의 콤포넌트 통합 테스트 모형에 적용한 결과를 분석하여 기술한다. 콤포넌트 통합 테스트 모형은 UML(Unified Modeling Language)의 순서도(sequence diagram)와 협력도(collaboration diagram)를 이용하여 전체 시스템에서 UML의 사건흐름을 구성하는 콤포넌트들 사이의 인터페이스 영역에 존재하는 오류들을 추출한다. 그리고 UML을 기반으로 통합 테스트를 수행함으로써, 테스트 준비 작업을 줄이고, 기존의 UML 지원 도구들과 연계하여 테스트 자동화 도구의 구현을 앞당길 수 있다. 또한 시스템의 순차적 흐름 뿐 아니라, 동시에 수행되는 흐름에 대한 정보까지 모두 수용하여 테스트함으로써, 콤포넌트 기반의 분산 환경의 특성에 적합하다. Abstract As the object-oriented approach to software development becomes more mature, software development from pre-existing, independently developed components becomes an important aim of software engineering. Therefore, integration testing becomes an important aspect of component-based software development. However, there has been little work done in the area of the component-based integration testing. In this paper, we propose the "component integration test model" which is based on UML. Furthermore, we describe a case study on "Multimedia Information Processing System" conducted to analyse the result from which our model is applied. Our model extracts the faults, which exist in interfaces of components, using sequence diagram and collaboration diagram of UML(Unified Modeling Language). As our model is based on UML, the preparation effort for testing is reduced and its test-tools can be implemented more easily through linking existing UML tool. And our model accepts the information of concurrent flow represented by collaboration diagram as well as sequential flow, so it is more suitable to component-based distributed environment.based distributed environment.

• 한국정보처리학회논문지
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• 제2권1호
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• pp.34-44
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• 1995

소프트웨어 개발자와 사용자에게 직면한 가장 중요한 문제는 프로그래밍 시스템 의 크기와 개발 노력의 예측이라고 할 수 있다. 본 논문에서는 자료 흐름도, 자료 사 전, 소단위 명세서로 구성된 구조화 명세서에 관한 각각의 특성을 정의하고, 구조화 명세서의 정량적인 평가 요소를 프로그램 메트릭스에 적용하였다. 또한 구조화 명세 서를 구성하는 자료 흐름도에 관해서는 정량적인 평가 실험을 하였다. 그 결과 상위 공정의 분석 단계에서의 산출물에 의한 하위 공정에 관한 공수 예측 모델을 제안한다.

• Nuclear Engineering and Technology
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• 제40권7호
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• pp.571-580
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• 2008

A Binary Decision Diagram (BDD) is a graph-based data structure that calculates an exact top event probability (TEP). It has been a very difficult task to develop an efficient BDD algorithm that can solve a large problem since it is highly memory consuming. In order to solve a large reliability problem within limited computational resources, many attempts have been made, such as static and dynamic variable ordering schemes, to minimize BDD size. Additional effort was the development of a ZBDD (Zero-suppressed BDD) algorithm to calculate an approximate TEP. The present method is the first successful application of a BDD truncation. The new method is an efficient method to maintain a small BDD size by a BDD truncation during a BDD calculation. The benchmark tests demonstrate the efficiency of the developed method. The TEP rapidly converges to an exact value according to a lowered truncation limit.

• 드라이브 ㆍ 컨트롤
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• 제10권2호
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• pp.30-36
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• 2013

Tractor is a farm vehicle that is designed to provide a high tractive effort at low speed. It is used for versatile agricultural tasks such as hauling a trailer, tillage, mowing and construction work. Most older tractors use a manual transmission. However, as the intensity of work increases, tractors equipped with automatic transmission become popular due to the work convenience. In order to give the operator a large degree of control in field work, 24 gears with automatic 8-speed and manual 3-speed are arranged in transmission. This paper deals with the gear train that is designed for 8-speed automatic transmission by the engagement of multi-disk clutches. The gear ratio for each speed as well as power transmission mechanism is analyzed through velocity analysis. In addition, constraints of mesh gear ratio are derived by investigating the power flow path in velocity diagram for the given 8-speed gear ratio.

• 한국국방경영분석학회지
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• 제2권1호
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• pp.101-109
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• 1976

The goal of tactical war-gaming is to create an environment for two opposing teams allowing them to make tactical decisions that would correlate with the decision which they would make under the same circumstances while at sea. Therefore the real time war-gaming methodology should be developed to achieve the goal of tactical war-gaming. Surface to surface engagement models for the real time war-gaming such as maneuvering, tracking and damage assessment models were discussed in this paper. Concurrently system flow diagram to aid war-gaming effort was suggested in appendix.

• 전기의세계
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• 제22권6호
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• pp.24-32
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• 1973

When applying capacitors to distribution line, an effort must be made to determine the economic benefits resulting from the installation of a capacitor. There have been many papers and articles published on the economics of capacitors. Most of these are special cases, or have so many qualifications that they are not much use for other cases unless very careful attention is given to minute details. A general economic analysis on a distribution line is very complicated problem. Consequently, a diagram solution is illustrated for determining the economic condenser and applying resonably well for the distribution line with any load division.

• International Journal of Quality Innovation
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• 제2권2호
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• pp.127-135
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• 2001

Personnel engaged in the medical field have implemented continual improvement by team activities in an effort to construct a system that reduces the risks involved in medical care. Knowledge in total quality management (TQM), especially statistical quality control (SQC) developed for industry, seems to be applicable to medical care. This paper describes the application of SQC to continual improvement in medical care.