• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.2723-2725
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• 2001

Nuclear power generations have been developed gradually since 1950. Nowadays, 440 nuclear power generations are taking charge of 16% of electric power production in the world. The most important factor to operate the nuclear power generations is safety. It is not easy way to control nuclear power generations with safety because nuclear power generations are very complicated systems. In the main control room of the nuclear power generations, about 4000 numbers of alarms and monitoring devices are equipped to handle the signals corresponding to operating equipments. Thus, operators have to deal with massive information and to grasp the situation immediately. If they could not achieve these task, then they should make big problem in the power generations Owing to too many variables, operators could be also in the uncontrolled situation. So in this paper, automatic systems to diagnose the fault are constructed using 2 steps neural networks. This diagnosis method is based on the pattern of the principal variables which could represent the type and severity of faults.

• 전기학회논문지
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• 제59권12호
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• pp.2119-2124
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• 2010

Reliability evaluation of power distribution system is the evaluation for all customers supplied from one power source as main transformer located in substation. However, power sources include not only the main transformer but distributed generations. Typical reliability evaluation has focused on configuration of power system with one source including failure rates of equipment. In this paper, we focus on not only configuration but power sources as distributed generations. New reliability evaluation method using power supplied probability (PSP) is proposed. The proposed evaluation method are proved through case studies.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.701-703
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• 2005

Recently, There has been growing interest in Distributed Generations with high-energy efficiency due to the Increasing energy consumption and environmental pollution problems. but an insertion of Distributed Generations to existing power distribution system can cause several problems such as voltage variations, harmonics, protective coordination, increasing fault current etc, because of reverse power. This paper was applied to Sukumar M[l] proposal schemes and identity the faulted section performing short-circuit analysis by MATLAB program to distribution systems interconnected a large number of distributed generations.

• 한국지능시스템학회논문지
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• 제12권2호
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• pp.129-134
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• 2002

원자력발전소는 안전성을 최우선으로 하는 매우 복잡한 대규모 시스템으로써 이를 제어하는 주제어실에는 4000여 개의 경보 및 감시장치들이 설치되어 있다. 원자력박전소는 시설의 위험성과 복잡성으로 인해 대부분의 공정관리와 진단이 운전원에 의해서 이루어지는데, 운전원은 여러 가지 센서나 계들로 부터 얻어지는 방대한 양의 데이터를 이용하여 운전 상태를 파악한다. 따라서, 발전소가 비정상 상태로 운전될 때, 운전원이 정확한 사고 원인을 분석하고 빠른 시간 안에 해결 방법을 찾는 것이 어려울 수 있다. 이러한 문제점들을 해결하기 위하여 본 논문에서는 2단 신경망을 이용하여 센서나 계측기들로부터 얻어진 데이터의 유형은 파악하여 고장 진단 시스템을 구성하였다.

• 전력전자학회논문지
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• 제18권1호
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• pp.63-71
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• 2013

This paper describes the coordinated droop control method for stand-alone type DC micro-grid to improve reliability and utilization of distributed generations and energy storage. The stand-alone type DC micro-grid consists of several distributed generations such as a wind power generation, solar power and micro-turbine, and energy storage. The proposed method which is based on autonomous control method shows high reliability and stability through coordinated droop control of distributed generations and energy storage and also capability of battery management. The operation of stand-alone type DC micro-grid was analyzed using detail simulation model with PSCAD/EMTDC software. Based on simulation results, a hardware simulator was built and tested with commercially available components and performance of system was verified.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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• pp.327-330
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• 2003

This paper proposes an estimation algorithm for the generating power of distributed generations(DG) interconnected with distribution networks. These days, DG are rapidly increasing and most of them are interconnected with distribution networks. The DG can supply power into the distribution network, which may make significant impact on fault current and the protection scheme of the interconnected distribution networks. Generally these influences of DG is proportioned as the distributed generator's power. Therefore, it is important to forecast the output power of distributed generator in PCC(point of common coupling). This paper presents the prediction method of DG's power by monitoring the current and phase difference.

• 한국인구학
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• 제33권3호
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• pp.75-99
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• 2010

이 논문의 목적은 한국사회의 세대갈등을 권력갈등, 이념갈등, 문화갈등으로 구분하여 갈등 형성의 배경과 실태를 분석하고 그 함의를 논의하는 데 있다. 실태 분석을 위하여 관공서의 집합 자료와 경험적 연구결과들이 활용되었다. 우선, 세대간 권력갈등의 핵심은 권력 이양시기를 둘러싼 충돌에 있다. 세대간 권력갈등을 의회 권력에 국한시켜 볼 때, 정권교체기의 이념적 지향의 부침과는 무관하게 젊은 의원들의 비율이 꾸준히 증가하는 저(低) 연령화 추세가 지속되고 있었다. 이러한 세대교체 추세는 당분간 다른 영역에서도 유지될 것으로 보인다. 다음으로, 세대간 이념갈등은 2002년 대선 전 후 극대화되었으나 04년 총선 이래 점차 완화되었다. 그러나 조건의 변화에 따라 일정한 계기가 주어지면 다시 활성화될 수 있을 것이다. 마지막으로, 문화 격차의 견지에서 볼 때 세대균열의 깊은 골은 대략 출생시점 1970년경을 중심으로 형성되었다. 문화갈등의 축을 성장주의 대 소비주의, 집단주의 대 개인주의, 권위주의 대 탈권위주의로 설정하여 갈등의 배경과 실태를 검토했다. 세 유형의 갈등 중 문화갈등의 역기능에 주목해야 한다. 세대간 문화격차 확대는 상호 의사소통을 방해하며 상호 교류와 공동 활동 기피라는 결과를 낳을 수 있기 때문이다. 문화갈등 완화를 위해, 사회 제 부문의 부조리와 비리 척결 그리고 세대 통합 프로그램을 활용하는 방안 등이 제시되었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.1392-1394
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• 2003

This paper presents the actual test data of 3 phase, 9 pole, 3.6 [kw] synchronized wind-power generator controlled by hinged vane system and the possibilities of the small mount wind-power generations at the south-east coast of Ul-san. It also shows the data of the wind-velocity acquired by wind-direction sensor, calculation and analysis of the estimated electrical generation power, energy storage systems, and the efficient usages of the wind-power system.

• 전기학회논문지
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• 제62권11호
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• pp.1604-1609
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• 2013

When the ground fault on the power side occurs on distribution system interconnected with distributed generations, the abnormal current is generated in the neutral conductor by the connection type and the iron core structure of transformers for the interconnection of distributed power supplies due to the unbalanced voltage of the system, and subsequently the false operation of the protective relay on the load side occurs. Herein, this paper proposes the method to correct errors in the phase current to prevent the false operation of the protective relay by applying p-q theory and presents the simulation result of the error correction algorithm using PSCAD/EMTDC.

• Journal of Radiation Protection and Research
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• 제42권1호
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• pp.56-62
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• 2017

Background: To help future generations make accurate value judgments about nuclear power generation and radiation, this study will provide an effective education plan suitable for South Korea by applying and analyzing programs for the understanding of nuclear power within the diversely operated programs in the current Korean education system. Materials and Methods: This study analyzed the difference in educational effects by operating a 13-session regular curriculum for one semester and a one-session short-term curriculum from March to July 2016. Results and Discussion: As a result of operating a 13-session model school and a one-time educational program to analyze behavior changes against the traditional learning model, it was found that all elementary, middle and high school students showed higher acceptability of nuclear power in South Korea. The variation was greater for the model school than the short-term program. Conclusion: To prevent future generations from making biased policy decisions stemming from fear regarding nuclear power, it is necessary to bolster their value judgments in policy decisions by acquiring sufficient information about nuclear power generation and radiation through educational programs.