• 경영과학
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• 제17권3호
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• pp.97-118
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• 2000

This paper proposes an evaluation model for internet shopping mall business by defining its characteristics and evaluation criteria. We analyzed the characteristics of internet shopping mall business environments and classified the business into four major categories. We derived the evaluation criteria which can evaluated all categories comprehensively. The proposed criteria are cost, netizen, technology, transaction, and marketing, each of which gives a significant impact on the business profitability. Based on these criteria, a quantitative evaluation method was developed. We also proposed a penta-classification scheme which can be used to identify the overall characteristics shape of each internet shopping mall business site. An actual application of our evaluation model was illustrated in order to show that our proposed model may be used in the real business sites.

• 대한전자공학회논문지
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• 제21권4호
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• pp.17-23
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• 1984

A model analysis of pattern shift in the epitaxial growth of silicon on (111) substrates was performed. The growth rate anisotropy was considered as the most important affecting factor of pattern shift, and for the model establishment the off angle of the substrate and the process temperature were taken as the variables. We derived a theoretical equation of pattern shift by assuming the growth rate anisotropy as the trigonometric sine function of the off angle of the substrate and defining the growth rate anisotropy factor related to the process temperature. The pattern shift ratio calculated by this model had the same tendency with the experimental ones, which, however, were about twice greater than those. It was supposed that this discrepailcy was due to the second order affecting factor such as facetting and step broadening which had been exluded in model establishment.

• 제어로봇시스템학회논문지
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• 제21권3호
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• pp.237-242
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• 2015

This paper presents a method to enhance tracking performance of an input-constrained bilinear system using MPC (Model Predictive Control) when a feasible tracking control is known. Since the error dynamics induced by the known tracking control is asymptotically stable, there exists a Lyapunov function for the stable error dynamics. By defining a cost function including the Lyapunov function and describing tracking performance, an MPC law is derived. In simulation, the performance of the proposed MPC law is demonstrated by applying it to a converter model.

• 대한전자공학회논문지
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• 제24권4호
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• pp.701-707
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• 1987

This paper is concerned with an accurate delay time modling of the ED MOS logic gates and its application to the multiple delay logic simulator. The proposed delay model of the ED MOS logic gate takes account of the effects of not only the loading conditions but also the slope of the input waveform. Defining delay as the time spent by the current imbalance of the active inverter to charge and discharge the output load, with respect to physical reference levels, rise and fall model delay times are obtained in an explicit formulation, using optimally weighted imbalance currents at the end points of the voltage transition. A logic simulator which uses multiple rise/fall delays based on the model as decribed in the above has been developed. The new delay model and timing verification method are evaluated with repect to delay accuracy and execution time.

• 한국컴퓨터정보학회논문지
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• 제12권5호
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• pp.113-119
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• 2007

프레임웍은 구체적이고 확장 가능한 기반 코드를 가지고 있으며, 설계자가 의도하는 여러 디자인 패턴의 집합으로 구성되어 있다. 클래스의 집합이라는 점에서 클래스 라이브러리와 동일하지만 단순한 클래스들의 모임이라기 보다는 어플리케이션을 개발할 수 있는 아키텍쳐를 제공한다는 점에서 차이가 있다. 프레임워크에서는 컴포넌트 라이브러리를 개발하고 관리하는 것이 매우 중요한 요소이다. 본 논문에서는 프레임웍에 기반한 컴포넌트간 메타관계를 정의함으로서 프레임웍에서 사용될 컴포넌트 모델을 설계하고, 모델을 이용한 적용사례를 제시한다.

• 한국국방경영분석학회지
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• 제16권2호
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• pp.56-74
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• 1990

Programming-in-the-Large refers to software development environment and includes the organization and representation of a system structure, module decomposition, component dependence analysis, seperate compilation, subsystem and composition identification. The most intricate problem in this environment is the mastery of the structural complexity of large software systems. Ada programming language is tailored to the needs for building of large, integrated software systems from many program units. The visibility graph generating model presented in this paper transforms Ada source program into a visibility graph with nodes for program units and edges for visibility relations among program units. The system description in terms of program units and their visibility relations produced by this model can be utilized for some apects of Programming-in-the-Large environment and also assists designeers, programmers, integrators and maintainers in defining, understanding and exploring the structure of evolving software systems. The model designed and implemented in Ada programming language runs on PCs and will remain useful both in practice and as experimental tool.

• 간호행정학회지
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• 제11권2호
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• pp.185-194
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• 2005

Purpose: Although ethical dilemma is important concept in nursing and many research is accomplished, some difference in defining ethical dilemma among researchers. Therefore the purpose of this analysis was to correct understanding and using about ethical dilemma by clarify the attributes of ethical dilemma. Method: The concept analysis model suggested by Walker and Avant(1988) is used to clarify what is meant by the term 'ethical dilemma'. Results: The defining attributes of ethical dilemma identified in this study were as follows. First, It is simultaneously occurrence that above two conflictive ethical alternatives. Second, It is ought to choose one of the above two conflictive ethical alternatives. Third, It is difficult to compare with two alternatives. Fourth, It is cannot delay the choices. Fifth, It is cannot do satisfactory resolution. Six, It is broken out fix, loss or feeling of powerlessness to an individual. Conclusion: In this study, a concept analysis of ethical dilemma was performed to more clearly understand ethical dilemma. It is hoped that this analysis will stimulate further study for developing strategies for prevention of nurses' ethical dilemma.

• 정보관리연구
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• 제36권3호
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• pp.97-126
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• 2005

지금까지 대부분의 시소러스에서 용어의 의미는 주로 관계나 범위주기를 통해 간접적으로 제시되어 왔다. 그러나 시소러스가 양적으로 팽창해짐에 따라, 이들을 통해 용어의 의미를 명확히 파악하는 것이 점차 어렵게 되었다. 이에 일부 시소러스는 사전의 정의를 함께 수록하기도 하였지만, 그 내용이나 형식이 만족스럽지 않은 것으로 인식되어 왔다. 이 연구는 용어의 의미를 제공하는 정의의 필요성을 토대로 표준화된 정의를 시소러스에 통합해 봄으로써, 시소러스가 더욱 발전할 수 있는 가능성을 제시하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.317-320
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• 2004

In this work we have managed to find parameters for defining athlete's aerobic and anaerobic thresholds. Thresholds which are of vital importance for top athletes. It is shown how differential evolution and different similarity measures has been used to tune computational model for threshold definitions. From our results it is obvious that the use of right parameter values for this kind expert system is of vital importance.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1994년도 춘계학술대회 논문집
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• pp.101-108
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• 1994

The sheet perforated with a uniform triangular pattern of round holes and subjected to in-plane stress f arbitrary biaxiality was investigated. The equivalent continuum approach was employed to develop a theoretical model for global analysis, which includes defining a yield criterion and the strain hardening in terms of apparent stresses and apparent strains. Finit element analysis and experiment tension test were performed to examine the validity of proposed yield criterion and strain hardening models of perforated sheets.