• Journal of Information Processing Systems
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• 제8권4호
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• pp.539-554
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• 2012

Model-driven and component-oriented development is increasingly being used in the development of embedded systems. When combined, both paradigms provide several advantages, such as higher reuse rates, and improved system quality. Performing model-driven and component-oriented development should be accompanied by a component model and a method that prescribes how the component model is used. This article provides an overview on the MARMOT method, which consists of an abstract component model and a methodology for the development of embedded systems. The paper describes a feasibility study that demonstrates MARMOT's capability to alleviate system design, verification, implementation, and reuse. Results indicate that model-driven and component-based development following the MARMOT method outperforms Agile development for embedded systems, leads to maintainable systems, and higher than normal reuse rates.

• Steel and Composite Structures
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• 제15권1호
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• pp.81-101
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• 2013

In this paper a robust 2-noded connection element has been developed for modelling the bolted end-plate connection between steel beam and column at elevated temperatures. The numerical procedure described is based on the model proposed by Huang (2011), incorporating additional developments to more precisely determinate the tension, compression and bending moment capacities of end-plate connection in fire. The proper failure criteria are proposed to calculate the tension capacity for each individual bolt row. In this new model the connection failure due to bending, axial tension, compression and shear are considered. The influence of the axial force of the connected beam on the connection is also taken into account. This new model has the advantages of both the simple and component-based models. In order to validate the model a total of 22 tests are used. It is evident that this new connection model has ability to accurately predict the behaviour of the end-plate connection at elevated temperatures, and can be used to represent the end-plate connections in supporting performance-based fire resistance design of steel-framed composite buildings.

• 한국컴퓨터정보학회논문지
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• 제21권10호
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• pp.125-133
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• 2016

In this paper, we propose a real-time fault monitoring and dual system design of the countdown time-generating system, which is the main component of the mission control system. The countdown time-generating system produces a countdown signal that is distributed to mission control system devices. The stability of the countdown signal is essential for the main launch-related devices because they perform reserved functions based on the countdown time information received from the countdown time-generating system. Therefore, a reliable and fault-tolerant design is required for the countdown time-generating system. To ensure system reliability, component devices should be redundant and faults should be monitored in real time to manage the device changeover from Active mode to Standby mode upon fault detection. In addition, designing different methods for mode changeover based on fault classification is necessary for appropriate changeover. This study presents a real-time fault monitoring and changeover system, which is based on the dual system design of countdown time-generating devices, as well as experiment on real-time fault monitoring and changeover based on fault inputs.

• 대한기계학회논문집A
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• 제27권5호
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• pp.724-733
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• 2003

Fatigue design rules for welds in the ASME Boiler and Pressure Vessels Code are based on the use of Fatigue Strength Reduction Factors(FSRF) against a code specified fatigue design curve generated from smooth base metal specimens without the presence of welds. Similarly, stress intensification factors that are used in the ASME B3l.1 Piping Code are based on component S-N curves with a reference fatigue strength based on straight pipe girth welds. But the determination of either the FSRF or stress intensification factor requires extensive fatigue testing to take into account the stress concentration effects associated with various types of component geometry, weld configuration and loading conditions. As the fatigue behavior of welded joints is being better understood, it has been generally accepted that the difference in fatigue lives from one type of weld to another is dominated by the difference in stress concentration. However, general finite element procedures are currently not available for effective determination of such stress concentration effects. In this paper, a mesh-insensitive structural stress method is used to re-evaluate the S-N test data, and then more effective method is proposed for pressure vessel and piping fatigue design.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.157-162
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• 2002

Recently, location based services, which make use of location information of moving objects, have obtained increasingly high attention. The moving objects are time-evolving spatial objects, that is, their locations are dynamically changed as time varies. Generally, GIS server stores and manages the spatial objects, of which locations are rarely changed. The traditional GIS server, however, has a difficulty to manage the moving objects, due to the fact of locations being frequently changed and the trajectory information (past locations of moving objects) being managed. In this paper, we have designed a moving object server, which stores and manages the locations in order to support various location based services. The moving object server is composed of a location acquisition component, a location storage component, and a location query component. The contribution of this paper is that we integrate the each work for location acquisition, storage, and query into a moving objects server.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.970-973
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• 2003

최근 들어 기업 내 또는 기업간 정보시스템의 개발 패러다임은 2계층 환경에서 3계층 환경으로 이동해오고 있다. 3계층 환경은 시스템의 성능, 확장성, 배포성, 유지보수 등의 측면에서 보다 효율적인 시스템의 구성을 가능하게 한다. 장기간의 설계기간과 대규모의 설계인원을 대상으로 하는 선박의 설계공정관리 시스템은 정보의 실시간성, 정확성이 확보되어야 함에도 불구하고 현재 2계층 환경으로 일부 개발되어 사용되고 있으며, 여전히 미 개발된 업무들도 있는 실정이다. 본 논문에서는 기존의 2차원적 클라이언트/서버 아키텍처 환경에서 3계층 아키텍처인 COM＋ 기반의 환경으로 전환하기 위해 CBD(Component Based Development)기법을 이용한 시스템의 분석 및 설계를 수행하였다. 향후 CBD 기반의 통합 시스템으로 개발함으로써, 선박 설계공정관리 업무의 생산성 및 효율성을 향상시킬 수 있다. 또한, 컴포넌트의 광범위한 재사용을 통해 시스템의 생산성 및 효율성 향상을 기대할 수 있다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2007년도 춘계학술발표대회
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• pp.653-656
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• 2007

과거의 기능 중심의 소프트웨어 개발방법론에서 벗어나 최근에는 서비스 중심의 컴포넌트 기반 소프트웨어 개발 (CBD: Component Based Development) 방법론이 새로운 개발 패러다임으로 각광을 받고 있다. 본 논문은 CBD 방법론 중 마이크로 소프트사의 MSF/CD 방법론을 기반으로 한 물리적인 설계를 할 때 기존의 CID (Component Interaction Diagram)에 Dispatch Agent 를 제안하였다. 실험 결과를 통해 제안된 기법이 component 서비스 속도를 향상시키고 보다 신속한 트랜잭션 처리를 제공함을 확인하였다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2000년도 가을 학술발표논문집 Vol.27 No.2 (1)
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• pp.495-497
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• 2000

CBD(Component-Based Development)는 이미 존재하는 소프트웨어 컴포넌트를 조립함으로써 시스템을 개발하는 방법이다. 컴포넌트를 이용하여 시스템을 개발하는 것은 개발시간과 비용을 줄이고, 생산성을 향상시키는 등 여러 가지 장점을 가진다. 그러나 여러 벤더에 의해 개발된 컴포넌트를 조립하는 것은 쉬운 일이 아니다. 이를 위해 컴포넌트가 어떤 문맥에서 사용되는지 이해하는 것이 필요하며 이 문맥은 아키텍쳐에 의해 결정된다. 따라서 본 논문에서는 컴포넌트 기반 개발을 위한 도메인 아키텍쳐를 제안한다. 도메인 아키텍쳐는 도메인을 구성하는 컴포넌트와 그들간의 관계에 대한 정보를 제공함으로써, 어플리케이션 개발을 쉽게 한다. 또한 도메인 아키텍쳐는 관련된 여러 시스템을 위한 아키텍쳐이므로, 도메인 아키텍쳐 상의 컴포넌트는 재사용이 높다.

• 전기의세계
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• 제24권5호
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• pp.72-80
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• 1975

In this paper an application of the Monte Carlo method to optimum circuit design is discussed. T. Tsuda and T. Kiyono's algorithm based on the Monte Carlo method for solving multiple simul-taneous nonlinear equations is generalized to apply it to finding solutions of the constrained nonlinear optimization problem. The generalized algorithm derived here is directly applied to economical circuit design. In the cirsuit design, the object function is a cost function which is related to the cost of each circuit component. The constraint is the variance of the total system expressed by the variances of each circuit component. The design is to be determined so that the circuit has specified drift reliability with minimum cost. A practical example of economical circuit design and a general nonlinear function minimization is presented with food results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1106-1107
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• 2007

Planar magnetic based design technologies have been widely applied to power design for better cooling and ease of fabrication. The planar transformer and the planar inductor have a low profile characteristics compare to the conventional transformer which would be more cubical in volume. High frequency operation of magnetic components is a main key to achieve high power density of the power module. However, at a high frequency, the skin effect and the proximity effect have to be considered very significantly in magnetic design and also the parasitics in the converter cannot be ignored. This paper deals with the design and the experiment of planar integrated magnetic component. The optimal design for planar magnetics is summarized.