• Journal of the Institute of Convergence Signal Processing
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• v.12 no.3
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• pp.212-216
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• 2011

Fault detection technique for photovoltaic power systems is significant to dramatically reduce economic damage in industrial fields. This paper presents a novel fault detection approach using Fourier neural networks and stochastic decision making strategy for photovoltaic systems. We achieve neural modeling to represent its nonlinear dynamic behaviors through a gradient descent based learning algorithm. Next, a general likelihood ratio test (GLRT) is derived for constructing a decision malling mechanism in stochastic fault detection. A testbed of photovoltaic power systems is established to conduct real-time experiments in which the DC power line communication (DPLC) technique is employed to transfer data sets measured from the photovoltaic panels to PC systems. We demonstrate our proposed fault detection methodology is reliable and practicable over this real-time experiment.

• Clean Technology
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• v.9 no.3
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• pp.145-151
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• 2003

This study shows the evaluation and consulting for pollution prevention of dye production by cleaner production methodology. Especially, this study intended to investigate the methods for reduction of process water and recovery of organic solvent (DMF), and to modify the process for higher qualified products in the acid dye production by cleaner production methodology. This methodology, consisting of 7 sequential phases (business leadership decision to start, problem definition, evaluation of the screened options, option selection for implementation, implementation, monitoring and sustainable implementation), is based on initial developments in the USA and Western Europe. Reduction of process water over 25%, recovery of DMF and solubility enhancement of acid dye over 2 times were achieved.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2005.10a
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• pp.637-646
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• 2005

우리나라 정부는 공공연구기관에서 개발된 기술을 민간부문에서 사용을 극대화하여 기업 및 국가경쟁력을 제고하기 위하여 기술이전과 기술평가 및 기술정보유통 등의 기반을 확충하여 산업전반의 기술경쟁력을 강화하고 있다(기술이전촉진법 제정(2000. 1. 28). 이와 같은 변화는 국가경쟁력의 무게중심이 산업기반경제에서 지식기반경제로의 이동을 나타내는 것이며, 미국을 비롯한 선진 국가들의 움직임은 우리나라보다 10년 이상 앞선 상태이다. 지식기반경제에서는 특허의 전략적 활용이 가장 중요하게 여겨지고 있으며 각 연구기관 및 기업은 특허의 포트폴리오에 총력을 기울이고 있다. 그러나 특허의 사업화 가능성을 판단하여 우수 특허군을 분류하거나 특허의 등록유지에 관한 결정을 내릴 때 현재 특허실사 맵, Risk-Return chart, 전문가 심의 방법을 범용하고 있으나 이와 같은 세 가지 방법은 평가자 개인의 주관적 입장이 강하게 작용하고 있어 문제점으로 지적된다. 본 고에서는 기존의 특허실사 방법론의 맹점인 평가의 주관성을 배제하기 위하여 객관적이고 표준화된 정보인 특허를 사용하여 고안된 두 가지 특허지수(CPP, TCT)를 사용하여 객관적인 특허실사 방법을 제안하고 실증분석을 통하여 사용 가능성을 고찰해 보았다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.40 no.5
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• pp.455-463
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• 2020

Road facilities with a service life of more than 30 years are expected to triple in the next ten years. The seismic performance of road facilities should be reviewed with consideration of the "Common Application of Seismic Design Standards" issued by Korea's Ministry of Public Administration and Security in 2017. These standards should be applied to all existing road facilities, including retrofitted or seismic-designed facilities, for evaluating seismic performance. In order to manage seismic performance for a large number of facilities, decision-support technology that can provide economic and reliable results is needed. However, the indices method currently used in Korea is a deterministic method, and the seismic performance of individual facilities is evaluated based on qualitative indices so that only retrofitting among road facilities is prioritized. In turn, with the indices method, it is difficult to support decisions other than the decision to prioritize retrofitting. Therefore, it is necessary to use the seismic risk assessment method to overcome such shortcomings and provide useful information such as direct loss, indirect socio-economic loss, and benefit of the investment.

• Nuclear Engineering and Technology
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• v.17 no.2
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• pp.116-128
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• 1985

Considering vacancy generation and migration in grain and sink at grain boundary, a mechanistic densification model which is dependent on UO$_2$ temperature and microstructure has been developed. This densification model is a function of time, fission rate, temperature, density, pore size distribution and grain size. The resultant equation derived in this model which is different from Assmann and Stehle's resultant equations for four temperature regions, can be applied directly for all the pellet temperatures. The predictions of the present densification model very well agreed with the experimental data. This model well predicts absolute magnitude and trend in comparison with the empirical algorithm used in KFEDA code.

• Tunnel and Underground Space
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• v.24 no.2
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• pp.155-165
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• 2014

Multiple thermal energy storage (TES) caverns can be used for storing thermal energy on a large scale and for a high-aspect-ratio heat storage design to provide good thermal performance. It may also be necessary to consider the use of multiple caverns with a reduced length when a single, long tunnel-shaped cavern is not suitable for connection to aboveground heat production and injection equipments. When using multiple TES caverns, the separation distance between the caverns is one of the significant factors that should be considered in the design of storage space, and the optimal separation distance should be determined based on a quantitative stability criterion. In this paper, we described a numerical approach for determining the optimal separation distance between multiple caverns for large-scale TES utilization. For reliable stability evaluation of multiple caverns, we employed a probabilistic method which can quantitatively take into account the uncertainty of input parameters by probability distributions, unlike conventional deterministic approaches. The present approach was applied to the design of a conceptual TES model to store hot water for district heating. The probabilistic stability results of this application demonstrated that the approach in our work can be effectively used as a decision-making tool to determine the optimal separation distance between multiple caverns. In addition, the probabilistic results were compared to those obtained through a deterministic analysis, and the comparison results suggested that care should taken in selecting the acceptable level of stability when using deterministic approaches.

• Archives of design research
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• v.20 no.1 s.69
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• pp.189-202
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• 2007

This study was carried out to forecast the future paradigm of design from the perspective of change in social environment within which design evolves through the process of birth, growth, development, and decline rather than changes within design itself. In general, before man takes an action, he sets the aim with mental and conceptual value decided internally and he considers various tools and means in his circumstance externally. Then he decides his action based on the most resonable and economic way. This is the mechanism by which all the living subjects including the human being survive and evolve within the given environment. In this respect, the future of design can be also explored and speculated in terms of change of man's mental value and the technology in future (this view is the same with what socio-culturalists see both cultural and technological determinism as a major factor for social change). Based on the view above, the present study extracted major keywords for a possible change of future design based on keywords on the present mental value and norm, and the materialistic technology and economy.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.10C
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• pp.921-932
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• 2002

In this research, we seek to identify an effective operation management strategy of telecommunication systems. In order to develop operation management strategies, we implement a quantitative techno-economic analysis. We evaluate related issues and factors, and apply the developed method to PSTN switching systems. In the proposed techno-economic modeling, we apply a well-known factor analysis technique-analytic hierarchy process-to evaluate PSTN operation management strategies. Then, we implement a decision analysis methodology to evaluate the cost of proposed strategies. We evaluate the proposed methodology by using available real data of the PSTN system. The primary impact of this research will be realized in helping PSTN operator select the best operation management strategy of PSTN system.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2008.04a
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• pp.264-265
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• 2008

문제의 정의부터 데이터의 조사, 측정, 수집, 전송, 분석, 지식의 창출, 그리고 최적의 의사결정 및 피드백에 이르는 전체 과정을 다루는 데이터기술은 2000년 전,후에 제안되었다. 아직 이에 대한 폭넓은 연구는 이루어지고 있지 못하지만 기업 비즈니스를 위한 CRM 등의 경영을 위한 효과적인 데이터 마이닝 방법론에 대한 개선을 위한 중요한 역할이 기대된다. 본 논문에서는 현재 연구되고 있는 데이터기술과 정보기술의 창조적인 융합을 제안하고 이를 통하여 효과적인 데이터 마이닝의 수행방안에 대하여 연구한다.

• Defense and Technology
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• no.4 s.170
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• pp.20-27
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• 1993

국가가 산업 경쟁력과 국방력을 동시에 확보하기 위해, 지원해야 하는 기술을 선정하고, 지원 정도 및 개발된 기술의 활용방안을 결정하는 것은 기술이 가지는 복합적 성격과 기술을 둘러싼 기술외적인 환경 때문에 결코 쉬운 일이 아닙니다. 따라서 민군 공용 기술개발 프로그램의 수행은 국가 산업 경쟁력 및 국방력의 강화라는 명분과 지원 과정에서 야기될수 있는 정치적 현실사이의 괴리감을 극복할수 있는 명확한 원칙과 방법론이 요구됩니다