• 제목/요약/키워드: Corporation performance

검색결과 1,793건 처리시간 0.035초

Data Augmentation Techniques of Power Facilities for Improve Deep Learning Performance

  • 장승민;손승우;김봉석
    • KEPCO Journal on Electric Power and Energy
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    • 제7권2호
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    • pp.323-328
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    • 2021
  • Diagnostic models are required. Data augmentation is one of the best ways to improve deep learning performance. Traditional augmentation techniques that modify image brightness or spatial information are difficult to achieve great results. To overcome this, a generative adversarial network (GAN) technology that generates virtual data to increase deep learning performance has emerged. GAN can create realistic-looking fake images by competitive learning two networks, a generator that creates fakes and a discriminator that determines whether images are real or fake made by the generator. GAN is being used in computer vision, IT solutions, and medical imaging fields. It is essential to secure additional learning data to advance deep learning-based fault diagnosis solutions in the power industry where facilities are strictly maintained more than other industries. In this paper, we propose a method for generating power facility images using GAN and a strategy for improving performance when only used a small amount of data. Finally, we analyze the performance of the augmented image to see if it could be utilized for the deep learning-based diagnosis system or not.

수소연료전지자동차의 절연성능 평가방법에 관한 고찰 (Study on the Evaluation Method of Electrical Isolation Property for Hydrogen Fuel Cell Vehicle)

  • 이기연;김동욱;김향곤
    • 한국수소및신에너지학회논문집
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    • 제22권6호
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    • pp.810-818
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    • 2011
  • This paper analyzed the suitability about the isolation performance criteria which was based on human impedance and effect of current in IEC 60479-1 on the safety of human being was examined. The method of evaluation by megger and DC voltmeter was analyzed. The differences of isolation performance according to design of high-voltage system were analyzed. The factors which affect the insulation performance were analyzed for HFCV, EV, HEV, etc. through analysis of the isolation performance evaluation method. Finally, design for improved isolation performance was proposed.

Investigation of anti-wear additives for synthetic esters; Amine salts of phosphonic acid

  • Hasegawa, T.;Minami, I.;Kidera, Y.;Hirao, K.;Memita, M.
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2002년도 proceedings of the second asia international conference on tribology
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    • pp.269-270
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    • 2002
  • Antiwear(AW) properties of phoshphonic acid derivatives for trimethylolpropane (TMP) esters were investigated under boundary conditions. AW effect of dialkyl phosphonates depends on polarity of base fluid. They provide good AW performance in less polar TMP esters, whereas their AW effect is not sufficient in polar TMP esters. Amine salts of phosphonic acid were developed as new AW additiνe system for TMP esters. They provide excellent AW performance even in polar TMP esters.

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IED IEC 61850 제어기능에 대한 성능시험 (Performance Test of the IED control function based on IEC 61850)

  • 이남호;장병태;이민수;한정열;안용호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.115_116
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    • 2009
  • IEC 61850 based substation automation system mainly consists of a various of protective and control IEDs. In order to implement the system, All of them should require the performance verification of IEC 61850 communication services for the assurance of interoperability throughout the digital network. This paper shows a research result on the testing method of IEC 61850 control communication interface of IEDs according to IED IEC 61850 conformance test procedures.

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SOFC 스택 안전성능 평가 시스템 제작을 위한 평가항목 도출에 관한 연구 (A Study of Deduction of evaluation Items for Design of SOFC stack safety performance evaluation system)

  • 박태성;남태호;이덕권;이승국;문종삼
    • 한국가스학회지
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    • 제21권6호
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    • pp.81-87
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    • 2017
  • SOFC(Solid Oxide Fuel Cell)는 고온 연료전지 중 하나이며, SOFC 시스템과 스택은 고온 운전 특성을 가지고 있다. 이러한 특성 때문에 시스템 설계 및 재료의 선택, 내구성 확보, 안전성능 확보에 많은 어려움을 가지고 있다. 따라서 SOFC 연료전지의 상용화와 보급을 위해서는 안전성능 평가기술과 평가시스템의 개발이 병행되어야 한다. 본 연구에서는 스택 안전성능 평가시스템의 제작을 위하여 국내 외 SOFC 관련규격 및 스택의 위험요소를 분석하였다. 분석한 자료를 바탕으로 스택 안전성능 평가 시스템의 제작을 위한 평가항목을 도출하였다. 본 연구 결과를 통해 SOFC 연료전지의 보급 활성화와 안전한 사용 환경에 기여할 수 있기를 기대한다.

개착식 전력구의 내진성능 평가 및 내진 안전성 검증 (Study on Seismic Performance Evaluation and Verification of Seismic Safety for Power Cable Tunnels)

  • 황경민;전낙현;정길영;박경성
    • KEPCO Journal on Electric Power and Energy
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    • 제6권4호
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    • pp.439-445
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    • 2020
  • 본 논문에서는 내진설계가 고려되어 있지 않은 전력구를 포함한 기설 개착식 전력구 100개소를 대상으로, 정부의 요구수준(내진 특등급, 0.22 g)을 만족하는지 확인하기 위하여 내진성능 평가를 수행하였다. 내진성능 평가 결과, 대상 전력구들은 대부분 0.3-1 g의 내진성능을 보유하고 있는 것으로 나타나, 내진 특등급 수준을 만족하였으며 내진안전성을 확보하고 있는 것으로 나타났다. 한편 응답변위법에 의한 전력구의 내진성능 평가 방법 및 결과에 대한 타당성을 확인하고, 전력구의 내진 안전성을 검증하기 위한 지진응답 해석 및 구조실험을 수행하였다. 그 결과 0.22 g 수준의 지진 하에서 응답변위법에 의한 상대변위는 지진응답 해석 결과보다 보수적이었으며, 실규모 구조실험에 의한 하중-변위 곡선 및 응답수정계수 산정 결과를 통해 전력구의 내진 안전성을 확인할 수 있었다.

철골브레이스에 의한 기존 RC건축물의 강도상승형 내진보강을 위한 설계고려사항 (The design considerations of steel braced frame for seismic retrofit through increasing the lateral strength of existing RC buildings)

  • 안충원;윤정환;송동엽;장범수;민찬기
    • 한국지진공학회논문집
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    • 제17권6호
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    • pp.293-303
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    • 2013
  • This paper deals with steel braced frame as increasing the lateral strength and ductility in order to seismic retrofit of existing buildings and discusses the designing criteria and calculation method of retrofitted buildings. The addition of steel braced frame can be effective for increasing the lateral strength and ductility of existing buildings. However, There is a problem in utilizing this method. It is the approach to provide an adequate connection between the existing RC frame and the installed steel braced frame, because global strength by failure mode(three type) depends on detail of connection and strength of existing RC frame. So, the designer must be confirmed if it satisfies the required performance or not. Failure mode of type I is the most appropriate for increasing the lateral strength and ductility. Seismic performance evaluation and strength calculation of seismic retrofit are performed by guideline by KISTEC(Korea Infrastructure Safety & Technology)'s "seismic performance evaluation and rehabilitation of existing buildings" and Japan Building Disaster Prevention Association. Buildings are modeled and non-linear pushover analysis are performed using MIDAS program.

도시철도운영기관에 종합신뢰성 경영시스템 적용 방안 (A Study on Application of Dependability Management System to Subway Corporation)

  • 한석윤;하천수;홍순기
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2005년도 춘계학술대회 논문집
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    • pp.199-205
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    • 2005
  • In this paper, we introduce IEC 60300(Dependability program management) into urban transit system, and propose effective method to apply IEC 60300 to Subway Corporation. The dependability is the collective term used to describe the availability performance and its influencing factors such as reliability performance, maintainability performance and maintenance support performance. A dependability program covers all phases of a system's life cycle from planning to operation and possibly disposal, and is composed of program elements divided into tasks.

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송전철탑의 내진성능평가 및 설계 풍하중과 지진하중의 비교 연구 (Seismic Performance Evaluation and a Comparative Study on the Design Wind and Earthquake Loads for Power Transmission Towers)

  • 황경민;전낙현;장정범;연관희;김태균
    • KEPCO Journal on Electric Power and Energy
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    • 제5권2호
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    • pp.75-81
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    • 2019
  • 본 연구에서는 최근 정부에서 제시한 표준설계 응답스펙트럼을 이용하여 송전용량, 높이 및 구조타입 등 다양한 변수를 고려한 송전철탑 24기를 선정하여 내진성능평가를 수행하였다. 또한, 정부에서 요구한 내진기준 상향 시 철탑의 설계에 미치는 영향을 검토하기 위하여, 현 설계 풍하중 및 개정 지진하중에 의해 발생되는 응력 및 단면력의 크기를 비교해 보았다. 내진성능평가 결과 대상 철탑들은 0.31~0.91g의 내진성능을 보유하고 있는 것으로 나타나, 2,400년 재현주기의 내진특등급 수준을 만족하였으며 내진안전성을 확보하고 있는 것으로 나타났다. 또한, 철탑의 지진에 의한 단면력은 풍하중에 의한 값의 33~82.5%로 나타나, 상향된 내진기준에서도 설계 풍하중이 지진하중보다 지배적임을 확인하였다.