• KDI Journal of Economic Policy
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• 제41권4호
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• pp.67-99
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• 2019

This paper, focusing on the renewable portfolio standard (RPS), evaluates alternative renewable energy policies. We propose a tractable equilibrium model which provides a structural representation of Korea's electricity market, including its energy settlement system and renewable energy certificate (REC) transactions. Arbitrage conditions are used to define the core value of REC prices to identify relevant competitive equilibrium conditions. The model considers R&D investments and learning effects that may affect the development of renewable energy technologies. The model is parameterized to represent the baseline scenario under the currently scheduled RPS reinforcement for a 20% share of renewable generation, and then simulated for alternative scenarios. The result shows that the reinforcement of the RPS leads to higher welfare compared to weakening it as well as repealing it, though there remains room to enhance welfare. It turns out that subsidies are welfare-inferior to the RPS due to financial burdens and that reducing nuclear power generation from the baseline yields lower welfare by worsening environmental externalities.

• 한국도로학회논문집
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• 제18권4호
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• pp.63-68
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• 2016

PURPOSES : The nonlinear model of fatigue cracking is typically used for determining the maintenance period. However, this requires that the model parameters be known. In this study, the particle filter (PF) method was used to determine various statistical parameters such as the mean and standard deviation values for the nonlinear model of fatigue cracking. METHODS : The PF method was used to determine various statistical parameters for the nonlinear model of fatigue cracking, such as the mean and standard deviation. RESULTS : On comparing the values obtained using the PF method and the least square (LS) method, it was found that PF method was suitable for determining the statistical parameters to be used in the nonlinear model of fatigue cracking. CONCLUSIONS : The values obtained using the PF method were as accurate as those obtained using the LS method. Furthermore, reliability design can be applied because the statistical parameters of mean and standard deviation can be obtained through the PF method.

• 한국비블리아학회지
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• 제7권1호
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• pp.193-230
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• 1994

The systematic classification of database is much debated issue currently in telecommunication industry. Nevertheless, the attempt to build the systematic model is nowadays nowhere to be found. The purpose of this study is to gain a general overview relating to this subject and to make out a draft for the development of standard model. Relating th the study for the databases classification, it was classified from the 9 points of view： manufacturer, subject, processed form (level), (re)presented form, language, completion state and updating cycle, retrieval method, communication media, and use.

• 문화기술의 융합
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• 제6권2호
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• pp.387-395
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• 2020

한국 정자의 표준모델은 한국전통의 미를 구현하고 시대적 흐름을 반영할 수 있으며, 보편적이고 현실적인 모델을 개발 함과 동시에 국제적으로 한국 전통미를 알릴 수 있는 계기가 될 수 있다. 따라서 본 연구에서는 한국 전통정자의 사례조사를 통해 우리 고유의 전통기술을 계승하고 한국정자의 정통성을 보존하면서 생활화, 산업화, 활성화, 세계화 할 수 있는 표준모델을 개발하는 것을 목적으로 한다. 사례분석과 현대의 트랜드를 고려하여 각 부분별로 계획을 진행하여 전통정자의 대표적인 유형인 사모정, 육각정, 팔각정에 대해서 표준모델을 제시할 수 있었다. 표준모델은 정통성을 고려하면서도 활용도를 높이기 위해 난간마루를 설치하고 계자난간을 설치하는 등의 디자인 트랜드에 약간의 변화를 주었다. 이렇게 제시된 표준모델은 현재의 디자인 트랜드가 반영된 것으로 추후에는 그 때의 트랜드에 따라 다른 형태로 변경될 수 있다. 이번에 개발된 한국 정자의 표준모델은 한국전통의 미를 재현하면서도 보편적이고 현실적인 모델이라고 할 수 있다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.1411-1417
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• 2006

The DC electric power system is the most important power source in a metro railway system. As metro railway system is expanded recently, the importance of DC electric power system is emphasized. Furthermore, the study for systemization and standardization of design and operation technique in DC electric power system is undergoing nowadays. For these studies, the development of standard analysis model for metro railway electric power system is required. In this paper, a standard analysis model for metro railway electric power system which is using PSCAD/EMTDC program is developed. The developed model is explained and the validity is shown by using the case studies.

• 기술혁신학회지
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• 제8권1호
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• pp.220-236
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• 2005

In today's R&D environment, as the complexity of IT systems increases and the expected quality level for R&D outcomes enlarges, it has been critical issues for us to effectively define and improve the R&D standard processes tailored for our organization and projects. To meet this needs, we defined the R&D standard processes based on the international standards for systems and software engineering and our existing traditional work methods, and then applied them of our ongoing projects. Now, we are improving our defined R&D standard processes continuously by monitoring of the processes and products and through the feedback of the application results. In this paper, we introduce the R&D standard process model developed by our organization (E research Institute in Korea) and the requirements and approaches used for their development and improvement. We compare our defined R&D standard processes with ISO/IEC 15288 which is the international standards for systems engineering and summarize the lessons learned through their development and improvement.

• KIEAE Journal
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• 제5권4호
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• pp.51-57
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• 2005

For the evaluating daylighting performance, field measurement, scale model test and a set of computer tools can be applied. For the scale model measurements, the sky simulator is a vital facility to represent the desired sky conditions consistently. Recently K university has developed a large size sky simulator, 6m-diameter and 3.7m-height, that is suitable for the international standard. To verify the reliability of the sky simulator, the luminance distribution on the inner sky surface was measured and compared with the CIE standard overcast sky model. It is found that the sky simulator can be reproduced the CIE standard overcast sky condition with 4.3% as mean difference. K university sky simulator is fully validated for usability and accuracy for daylighting researches.

• Journal of applied mathematics & informatics
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• 제42권3호
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• pp.695-708
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• 2024

In this paper we present a non-standard finite difference method for solving a fractional decay model. The proposed NSFDM is constructed by incorporating a non-standard denominator function, resulting in an explicit numerical scheme as easy as the conventional Euler method, but it provides very accurate solutions and has unconditional stability. Two examples from the literature are presented to demonstrate the performance of the proposed numerical scheme, which is compared to three methods from the literature. It is found that the method's estimated errors are extremely minimal, such as within the machine precision.

• 전자공학회논문지CI
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• 제45권3호
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• pp.7-14
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• 2008

21세기 정보화 사회에서 요구되는 정보통신 전문 인력을 양성하기 위하여 시간과 공간적 제약을 벗어나 정보통신 전문교육을 효율적으로 실시할 수 있는 온라인 교육을 통하여 교육 수요자 측면에서의 열린 평생교육의 필요성이 절실하게 요구되는 현실이다. 이에 따라 본 연구는 원격 교육 컨텐츠의 표준화 모델에 대하여 살펴보고 특히 정보통신 관련 컨텐츠의 표준 모형을 제시하여, 사이버대학의 정보통신 교과목 컨텐츠 제작과 운영의 기초 자료로 활용할 수 있도록 함으로써 온라인상에서의 정보통신 교과목을 효율적으로 운영하여 교육의 효과를 극대화할 수 있도록 기여하고자 하였다. 본 연구를 통해 현재 사이버대학 및 사이버 교육 기관의 정보통신 관련 컨텐츠의 현황과 문제점을 분석하고 사이버 교육 컨텐츠 제작에 관한 국제 표준화 활동에 대한 연구를 수행하여 정보통신 교과목의 컨텐츠 표준모형을 제시하였다.

• 한국축산시설환경학회지
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• 제15권1호
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• pp.17-28
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• 2009

PEB system is more economical when compared with structures commonly used Hot rolled and welded light H-beam was introduced in the Standard Livestock Housing. This study suggested more economical technology for structural design by the reduction of live load, relief of deflection limit and reduction of importance factor. And, when applying wind Load as a result of examination with Low Rise Building Systems Manual considering open model, we can know that when the wind load is big, enclosed model is more stable than open model. In short, Suggesting more economical model and providing the method to reduce natural disaster, by the application of PEB system and the development of technology for structural design, are considered to strengthen the competitive power of farmhouse.