• 전기학회논문지P
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• 제62권2호
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• pp.65-71
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• 2013

Nonlinear loads with harmonics exist in an actual power system where harmonic currents make voltage distortion. The sum of reactive power measured at individual load is different from the measured reactive power at a bus in a power system with linear and non-linear loads. In this study, ANN(artificial neural network) load modeling technique with consideration of harmonics is introduced for more accurate component load modeling and an impact coefficient is proposed for aggregation of component loads. Results of this research show more accurate load modeling method. Since precise data for power system analysis can be acquired, the proposed method will be used for power system planning and maintenance.

• 한국군사과학기술학회지
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• 제16권4호
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• pp.501-506
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• 2013

This research is to develop a simulation framework to gauge the mission effectiveness of the rotorcraft system that will be a part of Korean future combat system. The rotorcraft system comprises of many subsystems that are very time-consuming and tedious to model. Each subsystem and its characteristics have been modeled using component-based modeling techniques, which enhances its reusability. The entire system is then constructed from the individually modeled component, which significantly reduces the modelling time. The mission effectiveness of the rotorcraft system is simulated using the developed models, and the output indicates that the methodology proposed in this study is useful, which will be suitable for the modeling and simulation of Korean future combat system.

• 한국컴퓨터정보학회논문지
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• 제5권2호
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• pp.37-42
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• 2000

CORBA에서 객체 기술은 분산 및 이기종 기계에 분산되어 있는 소프트웨어 컴포넌트의 통합된 구현을 용이하게 한다. CORBA와 유사한 객체 통합 기술들은 표준화된 컴포넌트 통합 및 상호 동작 모델을 정하고 호환 불가능한 컴포넌트 구현을 캡슐 화하기 위한 객체지향 원리를 발전시켰다 본 논문에서는 Java Bean에 기반을 둔 분산 시스템 환경에서 객체와 객체간에 관련성을 모델링하기 위해 컴포넌트, 연결자 및 컴포넌트 스키마로 구성된 구조화된 모델을 제시하고 구현한다. 특히 Java Bean 환경에서 객체간의 관련성을 모델링하기 위한 연결자의 구성에 중점을 둔다.

• 한국전자거래학회지
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• 제7권3호
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• pp.49-60
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• 2002

Many researchers have studied component technologies with concept, methodology and implementation for partial business domain, however there are rarely researches for component classification to manage these systematically. In this paper, we suggest a component classification model, which can make component reusability higher and can derive higher productivity of software development. We take four focuses generalization, abstraction, technology and size. The generalization means which category a component belongs to. The abstraction means how specific a component encapsulates its inside. The technology means which platform for hardware environment a component can be plugged in. The size means the physical component volume.

• 정보처리학회논문지D
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• 제16D권3호
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• pp.381-394
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• 2009

소프트웨어 모델링 과정에서 생성되는 산출물들에 대한 모델의 재사용성을 향상시키기 위한 기법으로, MDA 모델 기반의 개발방법이 적용되고 있다. 아직도, UML을 이용한 MDA 기반의 개발에 대한 계층적이고 체계적인 기법은 미약한 상태이다. 이로 인해, MDA 메타모델에 기반한 일관성 있고 재사용성이 높은 MDA 모델링이 제대로 실현되지 못하고 있다. 본 논문은 이를 해결하기 위해, 2+1 View 통합 메타모델을 통한 MDA(PIM/PSM) 컴포넌트 모델링 기법을 제시한다. 먼저, 개발 프로세스 view와 MVC View를 표현할 수 있는 meta-architecture view 모델을 정의한다. 정의된 meta-architecture view 계층의 메타 레벨에서, 개발 프로세스 view와 MVC view별로 MDA 기반의 계층적 통합 메타 모델이 제시된다. 이 메타모델은 UML 모델과 GUI 모델이 갖는 모델링 요소들을 PIM과 PSM에 의해 계층적으로 표현한다. 제시한 메타모델을 ISMS 시스템에 적용하여 MDA 기반의 컴포넌트 모델링 사례를 제시한다. 이를 통해, 개발단계별 및 MVC 방식에 의해 일관성 있고 계층적인 MDA 컴포넌트 모델을 구축할 수 있다. 따라서, 모델에 대한 독립성과 재사용성의 향상을 기대할 수 있다.

• 정보처리학회논문지D
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• 제8D권6호
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• pp.747-752
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• 2001

UML은 용용시스템 또는 컴포넌트 개발과정에서 분석 및 설계과정을 모델링하여주는 표준언어이며, CORBA, COM+, EJB 등은 컴포넌트의 재사용을 실현화시켜주는 기술이다. 컴포넌트 개발과정에서 재사용가능한 컴포넌트와 새로 개발할 컴포넌트를 구별한 후 개발하면, 응용시스템이나 컴포넌트의 개발비용을 줄일 수 있고, 질이 좋은 컴포넌트를 생성할 수 있다. 본 논문에서는 컴포넌트의 개발과정에서 생성되는 산출물들의 모델링시에 필요로 하는 컴포넌트 속성에 따르는 확장된 UML 표기법을 정의한다. 또한, 사례 연구로 특정 영역인 웹상의 경매 시스템 개발에 필요한 컴포넌트들의 모델링 및 UML 적용기법을 소개한다.

• 한국전자거래학회지
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• 제7권3호
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• pp.139-158
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• 2002

Most of companies related to the area of B2B electronic commerce are making their efforts to innovate their existing business process into new designed process. XML-based electronic data interchange has potential to impact on reshaping the traditional EDI systems. This study intends to suggest a prototype of XML-based electronic data interchange using unified modeling language, with a case study applied in Korean automobile industry. In order to accomplish the research objectives, we employed UML as its standard modeling language, In this study, four diagramming techniques such as use case diagram, sequence diagram, class diagram, component diagram among eight modeling techniques are used for analyzing hierarchical business process. As a result of applying UML methodology, we design and develop XML/EDI applications efficiently. Our field test applied to Korean automobile industry shows that data modeling to design XML application using UML is better than existing methodologies in representing object schema of XML data and in extension and interoperability of systems.

• Environmental Engineering Research
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• 제24권1호
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• pp.31-37
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• 2019

In this paper the results of the biosorption of lead(II) and cadmium(II) with sugarcane bagasse in fixed bed columns are presented. Experimental data were fitted to several models describing the rupture curve for single-component and two-component systems. The percentages of removal of lead and cadmium in single-component systems are 91% and 90%, respectively. In lead-cadmium bicomponent systems the percentage of elimination of lead was 90% and cadmium 92%. In single-component systems, Yoon-Nelson and Thomas models successfully reproduce the rupture curves. In two-component system, the Dose-Response model was the best one reproducing the experimental rupture curves in the entire measured range.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2004년도 춘계학술대회 논문집
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• pp.136-140
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• 2004

A power-plant simulation tool has been developed for training the plant operators and testing a plant control system. The simulation tool is composed of a graphic editor, a component model builder and a system simulation solver. Such new programing techniques as object-oriented modeling and GUI(Graphical User Interface) are employed in developing the simulation tool. The graphic editor is based on the OpenGL library for effective implementation of GUI while the component model builder is based on object-oriented programming for efficient generalization of component models. The developed tool has been verified through the simulation of a real power plant.

• KIEE International Transactions on Power Engineering
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• 제2A권4호
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• pp.136-144
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• 2002

Load models are very important for improving the accuracy of stability analysis and load flow studies. Various loads are connected to a power bus and their characteristics of power consumption change with voltage and frequency. Thus, the effect of voltage/frequency changes must be considered in load modeling. In this work, artificial neural networks-ANNs- were used to construct the component load models for more accurate modeling. A typical residential load was selected and subjected to a test under variable voltage/frequency conditions. Acquired data were used to construct component models by ANNs. The aggregation process of separately determined load models is also presented in the paper. Furthermore, this paper proposes a method to transform a single load model constructed by the aggregation method into a mathematical load model that can be used in traditional power system analysis software.