• 제목/요약/키워드: Shut-down system

검색결과 138건 처리시간 0.024초

낙뢰위치표정시스템의 낙뢰 DB를 이용한 한반도 뇌격 특이특성 분석 (Analysis of the lightning characteristics by the Lightning DB in KOREA)

  • 우정욱;곽주식;심응보;이건웅;김기운;김병식
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 C
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    • pp.1658-1660
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    • 2001
  • Because the overhead transmission lines are exposed to the outdoor weather, the faults of the transmission lines are due to natural conditions, and among these faults, the outage rate by lightning is about 50%. The lightning causes the damage of power system equipments, the shut down of electricity and the electro-magnetic interference. Therefore, the pertinent insulation design is important, not only to decrease the damage of the facility itself but also to increase the reliability of electric power system. For these reasons, we have to obtain and accumulate the lightning current parameters for the basic lightning research. This paper describes the statistical distribution of lightning current parameters and the IKL map.

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전자교환기 품질관리를 위한 발생 호수와 재시도 호수 추정 (Attempt and Retry Estimation for the Quality-Control of Electronic Switching System)

  • 차경천;전덕빈
    • 산업공학
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    • 제18권3호
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    • pp.327-332
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    • 2005
  • The call-attempt behavior in a telecommunications service is influenced by the launch of new services and the choice of subscribers. On Feb 28, 2005, there was a disastrous shut-down of major local electronic switching systems (ESS) due to an abrupt increase of call-attempts. This incident turned out to be a strong proof that appropriate forecasting attempts are necessary not only for the capacity planning of network but also for the quality control of ESS. In this paper, forecasting models are first developed to estimate the daily ESS call-attempts and user retrial rates and then meaningful interpretations of results will follow. Finally future research topics will be presented.

Pilot scale biofilter를 이용한 축산폐수의 악취제거

  • 박정엽;문철현;장석진;황재웅;박성훈
    • 한국생물공학회:학술대회논문집
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    • 한국생물공학회 2002년도 생물공학의 동향 (X)
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    • pp.415-418
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    • 2002
  • A performance of pilot scale biofilter was investigated for the treatment of odorous waste gas. The system treated 508.7 $m^3h^{-1}$ of waste air with amine and ammonia concentrations ranging up to 0.06 $N-gm^{-3}$ Over the four month study, its elimination capacity was demonstrated up to 6.37 $N-gm^{-3}h^{-1}$ and its removal efficiency was 100%. Differ to lab scale biofilter, It is difficult to maintain the proper temperature of reactor because of low external temperature. Experiments were performed indicating various problem such as sudden system shut down, unstable pump, water addition malfunction and corrosion of reactor. However, pilot scale biofilter was stable when treatment of odorous waste gas.

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AECL CANDU 중수로형 발전소에서의 컴퓨터 적용 기술

  • 김석남;한재복
    • Nuclear Engineering and Technology
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    • 제27권3호
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    • pp.427-438
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    • 1995
  • 캐나다 원자력공사(AECL)는 1960년초 중수로형 원자력발전소 계통에 컴퓨터를 도입하여 처음에는 국부적으로 발전소를 제어하는 방법을 채택하였으나 점차 발전소 주요계통인 발전소제어계통 및 원자로 안전계통으로 확장하여 현재는 진보된 컴퓨터 응용 계측제어 기술로 개선된 Fully Computerized Shut down System 및 Distributed Plant Control System의 설계를 마무리하고 일부 기술을 신규 발전소 의 계측제어분야에 적응하여 운용하고 있는 상황에 있다. 본 보고서는 중수로형 발전소를 설계한 캐나다 원자력공사의 발전소 제어 및 원자로 정지계통 분야에 컴퓨터 기술을 적용한 배경과 그 기술을 2장, 3장에서 각각 서술하고 제4장에서는 이들 설비가 월성 1호기에서와 2, 3, 4호기에서의 차이점, 즉 설계변경된 부분을 소개, 고찰하여 보고 아울러 이의 기술이 향후 건설될 개량형 중수로에 적용 가능성과 관련 기술에 대하여 살펴보고자 한다.

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LPATS에 의한 7년간의 한반도 뇌격특성분석 (Analysis of the lightning characteristics by LPATS Data during 7 year)

  • 우정욱;심응보;곽주식;권동진;문재덕;한상옥
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 하계학술대회 논문집 A
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    • pp.509-511
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    • 2003
  • Because the overhead transmission lines are exposed to the outdoor weather, the faults of the transmission lines are due to natural conditions, and among these faults, the outage rate by lightning is about 50%. The lightning causes the damage of power system equipments, the shut down of electricity and the electro-magnetic interference. Therefore, the pertinent insulation design is important, not only to decrease the damage of the facility itself but also to increase the reliability of electric power system. For these reasons, we have to obtain and accumulate the lightning current parameters for the basic lightning research. This paper describes the statistical distribution of lightning current parameters and the IKL map.

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FTA기법에 의한 원전기동전원의 이용율 예측에 관한 연구 (A Study on the Availability Prediction of Start-up Power Supply in Nuclear Power Plant by FTAMethod)

  • 최규식
    • 대한전기학회논문지:전력기술부문A
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    • 제48권5호
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    • pp.517-523
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    • 1999
  • The Start-up transformers or on-site stand-by transformers are installed for the start-up and shut-down of generator and emergency status in unclear power plant. The on-site power supply configuration using these transformers must be detemined by considering configuration requirements, site characteristics, reliability and availability severely because it is remarkably important for safety and benefit of plant. The start-up or stand-by power supply configuration has been determined considering only safety requirements and construction cost up to now in Korea. I study various reliability estimating methods for the prediction of availability, and estimate the unavailability for the start-up power supply system of two 1,000㎿ unclear power plants. I also detemine the reliability and unavailability and unavailavility of equipment, system and configuration using FTA method.

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중소병원의 진료과목개설전략 - 지방공사의료원을 중심으로 - (The Strategy for Restructuring the Clinical Departments at Small and Medium Size Hospitals - With Cases of the Provincial Hospitals -)

  • 정기선;정수경;류규수
    • 한국병원경영학회지
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    • 제6권1호
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    • pp.147-163
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    • 2001
  • The purpose of this study was to find out the restructuring strategy for five provincial hospitals through the business analysis and survey of the service area. Through the survey of the service area of 5 hospitals. service area was classified into three groups, such as underserved area, adequate area, and overserved area. The strategy for the restructuring the clinical departments was set up based on the result of the business analysis and characteristics of the service area. The result of the study was as follows; 1) Whether or not a provincial hospital has specialized in specific area according to the circumstances and the needs of the community was the major factor influencing on the operating result of the hospital. 2) Provincial hospitals at the underserved area has to invest according to the changes of the occupancy rate and increasing pattern of the number of patients while maintaining the status as a general hospital. 3) Provincial hospitals at the adequate area has to lower the grade from the general hospital down to the hospital first and has to upgrade the competency through the restructuring the clinical departments and investment in specific area. 4) Provincial hospitals at the overserved area has to lower the grade from the general hospital down to the hospital first and has to seek ways to change the hospital fundamentally into geriatric hospital, pneumoconiosis hospital or psychiatric hospital etc. Provincial hospitals incapable to compete with private hospitals and clinics has to lower the grade from the general hospital down to the hospital first, to specialize in specific area and to restructure some clinical departments into rental base or self-operating basis. In case such methods are judged not so good solution, provincial hospitals has to find out ways such as shut-down of several departments or operating under the attending system.

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무인항공기 체계의 통합검증을 위한 무인항공기 체계통합실험실(UAV SIL) 개발 (Development of Unmanned Aerial Vehicle System Integration Laboratory(UAV SIL) for the Integrated Verification)

  • 심재익;우희채;김상진;정상준
    • 한국군사과학기술학회지
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    • 제27권1호
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    • pp.70-79
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    • 2024
  • This paper describes the results of the development of the the unmanned aerial vehicle system integration laboratory(UAV SIL) for the integrated verification. This UAV SIL is designed to test the robustness of the UAV system including the operational logics and the flight control system behaviors under many abnormal and emergency conditions such as data-link losses, airborne subsystem failures, engine shut down conditions, and ground control station faults. This paper presents how to build the UAV SIL and how to verify the in-development UAV system through the UAV SIL.

SAFETY ANALYSIS OF INCREASE IN HEAT REMOVAL FROM REACTOR COOLANT SYSTEM WITH INADVERTENT OPERATION OF PASSIVE RESIDUAL HEAT REMOVAL AT NO-LOAD CONDITIONS

  • SHAO, GE;CAO, XUEWU
    • Nuclear Engineering and Technology
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    • 제47권4호
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    • pp.434-442
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    • 2015
  • The advanced passive pressurized water reactor (PWR) is being constructed in China and the passive residual heat removal (PRHR) system was designed to remove the decay heat. During accident scenarios with increase of heat removal from the primary coolant system, the actuation of the PRHR will enhance the cooldown of the primary coolant system. There is a risk of power excursion during the cooldown of the primary coolant system. Therefore, it is necessary to analyze the thermal hydraulic behavior of the reactor coolant system (RCS) at this condition. The advanced passive PWR model, including major components in the RCS, is built by SCDAP/RELAP5 code. The thermal hydraulic behavior of the core is studied for two typical accident sequences with PRHR actuation to investigate the core cooling capability with conservative assumptions, a main steam line break (MSLB) event and inadvertent opening of a steam generator (SG) safety valve event. The results show that the core is ultimately shut down by the boric acid solution delivered by Core Makeup Tank (CMT) injections. The effects of CMT boric acid concentration and the activation delay time on accident consequences are analyzed for MSLB, which shows that there is no consequential damage to the fuel or reactor coolant system in the selected conditions.

양어장 자동화 시스템의 개발 -1. 모형 수조를 중심으로- (The Development of an Automatic Aquaculture System -1. Using a model tank-)

  • 강호원;이성호;김제윤;정석권;김상봉
    • 한국수산과학회지
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    • 제28권3호
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    • pp.294-300
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    • 1995
  • In aquaculture industrial field, an automatic management and control system is needed to cope with the difficulties such as expensive wage, ripe age of management worker and risk according to the unexpected change of environmental conditions in the aquarium. This paper introduces an automatic aquarium monitoring and control system. The system is developed using PC single board computer. A PC can be connected to multi-single hoard computers, and the communication between PC and single board computers is based on RS-422/485 interfacing method. The physical data of pH, DO, temperature and water level etc. are real-timely treated in the single board computer though individual transducers, transfered to the main monitoring PC through RS-422/485 communication, and those data are graphically shown on the PC monitor. Furthermore, the environmental circumstance can be monitored through the image processing system, and the emergency system can be operated under the condition of environmental incident such as electric power stoppage, DO deficiency, pump shut down and low level water etc.

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