• 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.

• 경영과학
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• 제27권1호
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• pp.45-60
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• 2010

This study evaluates life annuity plans based on two different types of measures : financial benefit and utility on consumption. The financial benefit is measured by Money's Worth (MW) ratio and return on annuity. For the measure of utility, an optimization problem is formulated with the objective of maximizing utility on consumption. To solve the optimization model, we use Dynamic Programming (DP) technique. The both types of measures are applied to cases of Korean pre-retirees at age 40 with different accumulation years of annuity (i.e. level of annuity asset at the age of retirement) and different timings of annuitization. Our results generally indicate that the utility based optimization model is superior to the financial measures in terms of providing a better evaluation of an annuity plan due to its capability to consider an individual's financial situation during his/her retirement period. Also, they suggest that the level of annuity asset is an important factor when an individual determines the optimal annuitization timing.

• Journal of Power Electronics
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• 제16권2호
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• pp.815-822
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• 2016

The efficiency of light-emitting diode (LED) devices is a significant factor that reflects the capability of these devices to convert electrical power into optical power. In this study, a method for estimating the efficiency of LED devices is proposed. An efficiency model and a heat power model are established as convenient tools for LED performance evaluation. Such models can aid in the design of LED drivers and in the reliability evaluation of LED devices. The proposed estimation method for the efficiency and heat power of LED devices is verified by experimentally testing two types of commercial LED devices.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 A
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• pp.67-69
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• 1993

The purpose of the facility investment planning for bulk power system is to appropriately configure the power system network to supply the load, which has the supply capability satisfying the probabilistically changing load on the desired reliability level. In order to achieve this purpose, this paper represents the reliability evaluation of the KEPCO's real system with using the MEXICO model, and builds the data base of the power system operation in order to effectively handle the computer model.

• 한국항만경제학회지
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• 제22권3호
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• pp.141-160
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• 2006

급변하는 해운물류환경에 대응하여 해운기업들이 경쟁적 우위를 획득하기 위해서는 무엇보다 자신들의 서비스 역량을 강화하는 노력이 필요하다. 이를 위해서는 정기선사의 물류서비스 속성(attributes)에 대한 정확한 이해와 함께, 이들 속성간의 상대적 중요성을 평가하여야 한다. 본 연구는 선행 연구에 대한 검토를 통하여 정기선사의 다양한 물류서비스 속성을 추출하고, 31명의 해운전문가에 대한 설문조사를 통하여 6개로 축약된 주요물류속성의 상대적 중요도와 선사별 성취정도에 대한 자료를 취합하였다. AHP(Analytic Hierarchy Process) 기법을 적용하여 핵심평가요인들의 상대적 중요도를 측정한 후 Fuzzy 모형을 이용하여 2개 국적선사와 5개 외국적 선사를 대상으로 핵심평가요인들에 대한 상대적 역량을 평가하였다. 분석 결과 국적선사들은 전체적인 성과에 있어서 상위 수준인 것으로 평가되었는데, 고객서비스 측면에서 외국적 선사에 비해 통계적으로 유의한 수준에서 우수한 것으로 나타난 반면, 운임 경쟁력 부문에 있어서는 통계적으로 유의적이지는 않지만 상대적인 열위를 나타내었다. 본 연구는 국적 선사들이 경쟁적 우위의 두 가지 원천인 비용(cost advantage: 운임경쟁력)에서는 열위에 있지만, 차별화(differentiation advantage: 고객서비스)에서는 높은 수준의 우위를 점유하고 있어 전반적으로 우수한 성과를 나타내고 있음을 보여주고 있다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.479-482
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• 2015

The objective of this study is to develop adaptive neuro-fuzzy inference system (ANFIS) model for estimating daily solar radiation using limited weather variables at Champaign and Springfield stations in Illinois. The best input combinations (one, two, and three inputs) can be identified using ANFIS model. From the performance evaluation and scatter diagrams of ANFIS model, ANFIS 3 (three input) model produces the best results for both stations. Results obtained indicate that ANFIS model can successfully be used for the estimation of daily global solar radiation at Champaign and Springfield stations in Illinois. These results testify the generation capability of ANFIS model and its ability to produce accurate estimates in Illinois.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.483-486
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• 2015

The objective of this study is to develop generalized regression neural networks (GRNN) model for estimating daily solar radiation using limited weather variables at Champaign and Springfield stations in Illinois. The best input combinations (one, two, and three inputs) can be identified using GRNN model. From the performance evaluation and scatter diagrams of GRNN model, GRNN 3 (three input) model produces the best results for both stations. Results obtained indicate that GRNN model can successfully be used for the estimation of daily global solar radiation at Champaign and Springfield stations in Illinois. These results testify the generation capability of GRNN model and its ability to produce accurate estimates in Illinois.

• 기술혁신연구
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• 제14권3호
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• pp.117-154
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• 2006

This research examines performance evaluatees' opinions regarding the current institutional performance evaluation systems of Government S&T Research Institutes (GRIs). Under the current evaluation systems, twenty GRIs are grouped into three Research Groups and each Group has its own evaluation systems. One problem of the current institutional evaluation systems is that the systems cannot reflect individual GRIs' characteristics. The following methods are used. First, based on four perspectives of Kaplan & Norton(1992)'s Balanced Scorecard(BSC) model, six perspectives appropriate to GRUs' characteristics are derived. Second, experts classify current performance evaluation measures into the six perspectives. This enables different evaluation systems of three GRI Research Groups to be compared under the same evaluation measures. Third, GRIs' evaluatees are asked to allocate appropriate weights on the performance measures. Evaluatees' weights of a GRI are compared with average weights of the related Group. Finally in every BSC's perspective, GRIs that have extraordinarily over-scored or under-scored weights are analyzed in terms of GRIs' missions, customers, capability of human resources, etc. In the Basic Research Group, the Korea Basic Science Institute is deviated in the financial perspective and the strategic direction perspectives. In the Public Research Group, Korea Institute of Construction Technology is significantly different from other GRIs in three perspectives. Five out of eight GRIs in the Industrial Research Group, GRIs are significantly different each other in several perspectives. It could be concluded that the current institutional evaluation systems are least appropriate in measuring performance of the GRIs of the Industrial Research Group.

• 한국수자원학회논문집
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• 제38권9호
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• pp.713-725
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• 2005

본 연구에서는 미국 지질조사국에서 개발한 PRMS 모형을 국내 7개 댐유역에 적용하여 국내 적용성과 모의한 계를 분석하였다. 모형의 적용성을 평가하기 위해 모형 이론과 매개변수에 대해 검토하고, 국내 실정을 고려한 입력자료와 매개변수 추정의 가용성을 분석하였다. 각 적용유역들에서 GIS자료를 활용하여 추정 가능한 매개변수들은 추정하고 나머지 변수들은 Rosenbrock 방법을 이용하여 보정하였다. 모의결과를 다각적으로 분석하여 PRMS 모형의 모의 능력과 한계를 분석한 결과 PRMS 모형은 모든 적용유역에서 관측치에 높은 적합성을 나타내었다. 기본값을 사용한 융설모의에서도 비교적 정확한 모의가 가능한 것으로 나타났다. 적용 유역면적에 상관없이 신뢰성 높은 유출분석이 가능하였으나, 대유역인 경우 준분포형적인 특성보다는 일체형모형에 가까운 유출모의를 하는 것으로 나타났다.

• Journal of information and communication convergence engineering
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• 제6권3호
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• pp.323-326
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• 2008

Data Envelopment Analysis (DEA) is a theoretically sound framework for performance analysis that offers many advantages over traditional methods such as performance ratios and regression analysis. Largely the result of multidisciplinary research during the last three decades in economics, engineering and management, DEA is best described as an effective new way of visualizing and analyzing performance data. Besides, overseas information technology companies have aggressively tried to enter the domestic market. In the age of globalization and high competition, it is imperative that the system integration (SI) companies need to introduce the performance evaluation models of SI projects, including Capability Maturity Model and Software Process Improvement and Capability Determination, to gain a competitive advantage. Therefore, it makes our research regarding evaluation of SI projects very opportune. The purpose of the study is not only to evaluate efficiency of each project by DEA but also to gain insight into various factors such as project complexity, team members' man-months structure, and process index(project management index) that link to the projects performance.