• 제목/요약/키워드: Lightening Protection System

검색결과 9건 처리시간 0.027초

피뢰시스템 구성부품 중 금속접속재의 성능시험 및 결과분석 (An Analysis of Performance Testing for Metallic Connection Components of Lightning Protection System)

  • 이주철;이안기;김재철
    • 조명전기설비학회논문지
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    • 제28권7호
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    • pp.69-74
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    • 2014
  • Recently, IEC published new standards about the requirements and tests for lightning protection system(LPS) components. If components are used for LPS, they should comply with the IEC standards. This paper, we collected six specimens for the metallic connection components using in domestic, and it tested for withstand lightning current which according to the IEC 62561-1. As a result, only one specimen meet this performance requirement. The specimen is the metallic connection component with four bolts fixed. Therefor, when designing of LPS in domestic, the metallic connection components shall be taken into account for the selection of the withstand lightning current. In addition, we need to develop for LPS components product and the national standards.

저압 전기설비의 과전압 억제 필요성 판단 (Judgement of the need for Over-Voltage Control of the Low-Voltage Electrical Installations)

  • 이주철;김재철
    • 조명전기설비학회논문지
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    • 제29권2호
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    • pp.91-96
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    • 2015
  • There are provision for risk analysis in IEC standards. It is to determine the need for installation of a surge protection device (SPD) in order to protect the low-voltage electrical installations from overvoltages caused by atmospheric phenomena and the like. However, scattered many related standards, the lack of details are not easy to apply it in the field. We investigated the relevant domestic and international standards for applies to the international standards in domestic. And we proposed the flow chart for determining the need for protection of the low-voltage electrical installations from overvoltage due to atmospheric phenomena and it set the appling target facility.

복합재항공기 연료시스템의 낙뢰보호설계 및 인증 연구 (Research on Aircraft Lightning Protection Design and Certification of Fuel System in Composite Material)

  • 이영제;조원일;전정환;고진환
    • 한국항공운항학회지
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    • 제25권4호
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    • pp.130-140
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    • 2017
  • Lightning protective design of an aircraft fuel system is closely related to the safety of the flight. Recently, composite material in building an aircraft becomes more important because it can reduce the weight of the aircraft. The composite materials decrease the protection against the effect of lightning. Lightning protective design of metal material aircraft has been researched for a long time and the design technique has been announced widely. However, research on the lightning protective design using composite material aircraft is very limited. In this study, lightning protective design for fuel tank structural component, access cover, fuel filler cap and drain valve in carbon fiber composite material aircraft have been presented. To show the compliance with FAA airworthiness standard regarding the presented protection designs, three steps, including lightning strike analysis, lightning environment analysis and certification test, were conducted in accordance with FAA AC 20-53.

ZCT틀 이용한 피뢰기 열화 감시 시스템 개발 (Development of Lightning Arrester Degradation Monitoring System Using ZCT)

  • 박정남;이용희;장수형;김필석;신양섭;김영근;서정민
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 하계학술대회 논문집 C
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    • pp.1626-1628
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    • 2003
  • The lightning arrester is a very important overvoltage protection device in the electric power system. Therefore, the inspection of lightning arrester whether it keeps its performance or not properly has close related to verifying the safety confidence of the electric power system. But the development of the deterioration measuring method and on-line detecting system, is necessary to monitor the deterioration of the lightening arrestor. In this paper, we developed the lightning arrester degradation monitoring system. This system detected leakage current of lightning arrester by using the ZCT, and analyze the third harmonics ingredient of leakage current using DFT method in the Data Acquisition Unit(DAU). The analyzed current signal is transmit to the Human-Machine Interface(HMI), and HMI alarmed when accident are occurred and informed with the amplitude of leakage current to the operator.

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서울월드컵경기장 전기설계 (Seoul World Cup Stadium Electric Plan)

  • 최용민
    • 기술사
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    • 제34권5호
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    • pp.40-43
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    • 2001
  • 상암동 월드컵 주정기장은 축구 전용경기장으로서 2002년 월드컵 축구경기를 위한 꿈과 감동의 라이브 스테이지로서의 스타디움 시설로 각종 국내외 축구경기는 물론 문화행사를 효율적으로 운영할 수 있도록 계획되었다. 이에 효율적인 경기장 시스템 구성과 적정한 전기시설물 설치로 최상의 경기운영을 할 수 있도록 전력시스템을 안정화 하였으며, 월드컵 경기 이후 스포츠공간과 상업시설, 공공시설 등 복합화된 스포츠 문화시설에 부합할 수 있도록 수변전 설비 및 방재센타 등을 다분화하여 시설하였으며 국제적 행사의 장에 전기인으로서 일익을 담당할 수 있었음에 감사한 마음이다.

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확률형 아이템 뉴스 마이닝 : Word2Vec 활용한 키워드 유사도 분석 (Mining Loot Box News : Analysis of Keyword Similarities Using Word2Vec)

  • 김태경;손원석;전성민
    • 한국IT서비스학회지
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    • 제20권2호
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    • pp.77-90
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    • 2021
  • Online and mobile games represent digital entertainment. Not only the game grows fast, but also it has been noted for unique business models such as a subscription revenue model and free-to-play with partial payment. But, a recent revenue mechanism, called a loot-box system, has been criticized due to overspending, weak protection to teenagers, and more over gambling-like features. Policy makers and research communities have counted on expert opinions, review boards, and temporal survey studies to build countermeasures to minimize negative effects of online and mobile games. In this process, speed was not seriously considered. In this study, we attempt to use a big data source to find a way of observing a trend for policy makers and researchers. Specifically, we tried to apply the Word2Vec data mining algorithm to news repositories. From the findings, we acknowledged that the suggested design would be effective in lightening issues timely and precisely. This study contributes to digital entertainment service communities by providing a practical method to follow up trends; thus, helping practitioners have concrete grounds for balancing public concerns and business purposes.

장갑판재용 고경도 강판의 용접 기술동향 (Welding Technical Trend of High Hardness Armour Steel for Combat Vehicle)

  • 정영철;김찬규;이승준;정용문;박철수;이병석;박태원;김홍규;조영태
    • 한국군사과학기술학회지
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    • 제22권3호
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    • pp.299-310
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    • 2019
  • Increase of combat capability through the lightweighting of vehicles has been internationally issued. One of the methods for lightening is applying high hardness armor(HHA) steel which is outstanding ballistic performance and protection performance compared to weight. Development of HHA steel is currently completed in America, United Kingdom, Australia and Germany. It is used for not only combat vehicle, but also various combat device. Korea is developing new material of HHA steel according to this trend. When such HHA steel is applied to structure, welding process is used for connection of the structure. Cracks from hydrogen embrittlement and cold cracking are easily generated in welds of HHA steel and it greatly affects the strength of all structure. Decrease of strength from welding defect is critical to combat capability. Therefore, welding process optimization is important for performing the role of structure. In this study, international welding technology is reviewed through scientific research paper and patent.

산욕부 안위에 영향을 미치는 병원환경 요인에 관한 연구 (Study on Hospital Environmental Causes Affected the Mother′s Comfort After Her Child Birth)

  • 변수자
    • 대한간호학회지
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    • 제8권1호
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    • pp.1-15
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    • 1978
  • The Purpose of this study is to examine closely the causes influenced upon the comfort and recovery of the woman delivered of a child in the hospital at the same time to understand environmental status of hospitals in order to promote mother's health recovery, and to improve hospital environment by emphasizing the meaning of environment and health before the medical staff and hospital administrative authority. In the method of servery of the research, 165 post paestum patients have been randomly selected who were accommodated and delivered their babies at OB(obstetric ) & GY (Gynecologic) unit the 7 general hospitals for the period of 6 December 1976 through 17 December 1976. As for the survey, it has been used of Questionnaire where we have 65 items in the respect of personal environment in the hospital such as trusting nurse, ability, reliability, kindness and etiquette of nurse and tile character of nurse the relationship with patients the other respect of physical environment included 9f temperature, moisture. air-ventilation lightening noise, cleanness. facilities, and the third realm being of mother's hearth ground to have the following conclusion 1. The feature of the collected personnel they are from OB or GY sects of from OB unit of the other 5 hospitals except the two general hospitals of the college or school Otherwise the rate of the patients to nurses would be 9 : 1. As for the nurses'ground it would be appeared of 20-25 years of age as the 76%. either 3 year course or 4 year course in the education would be each 50% and less than 2 year experience case would record as of 60 %. In the respect of hospital physical environmental status, there we have two hospitals without any thermometers, on the other han4 nowhere there's hygrometer, otherwise, the lightening is normal or over than normal As for the structure of noise protection the corridors're, generally speaking worse than rooms, nerver hueless, there's no ventilating system in the hospitals. The rooms'repainted in white and yellow, light green white, or green color. The patient's clothing were in green pink blue, light green or in white co for. There're not anything special in both decoration and equipments. Most of them used tall beds except in one hospital 2. To the extent of perception of patient's hatch 9round and hospital environment it is presented that they perceived nurse's ability in highest in total human variable, though perceived kindness or etiquette in the lowest otherwise, comparatively high in total average. 3. In the respect of physical environment it is highest perceived of lightening terms, otherwise, lowest perceived of air ventilation and total average became lowest than the one of the original record 4. To ages, in the respect of hatch ground rather old aged mother than the younger one has perceived that nurse would be trusting, in good service character, able, at the same time, liable, Otherwise, in physical environment regardless of age, they perceived lightening in high and remarkably lower in ventilation As a result of the examination of the difference in hospital environment to each age it is appeared of statistical difference at 5% level of ability in the personal environment otherwise little difference as for physical environment 5. In the respect of perceiving level to educational standard it is highly perceived of personal environment for higher ranking group rather than lower group in the educational standard. In case of physical environment it is highly perceived for lower level group rather than higher level group in educational background. The variables which have statistical significance at 5% level are from trusting kindness, etiquette and total kindness, etiquette and total all significance at 5% level are from trusting, kindness, etiquette and total human environment variable in personal environment, otherwise, there's little difference in the physical environment. 6. The perceiving level due to times of admission and accommodation at the hospital would be cleared out as gradual higher perception both physical and personal environment in the hospital. At 5% significant level of the ventilation condition in physical environmental variable it is presented of meaningful difference otherwise, there we have little difference both in Personal variable and other one. 7. In accordance with living standard, the perception degree of personal environment in tee hospital would be inclined to increase to higher living standard on the other hand, in case of the physical environment, the perception level world increase to lower living standard At 5 % level, the trustuariable and total scores in the personal eicuironmectal variable there appeared a meaningful/ significant difference otherwise, there presented little difference both in physical environmental and other variable to the living standard 8. Pertaining to family unit, the mother of an independent family unit perceived highly in all respect of the personal and the physical environment in the hospital rather than the woman of succeeding family unit. At 5 % level there appeared a difference in the respect of kindness and etiquette both in personal environment variable, on the other hand, there hardly marked a difference between other variable and physical environmental one. 9. The degree of perception to comforting level has little connection with a statistical difference the age, educational level hospital admitting times, living standard or family unit. 10. The most effective variable to mother's comforting level will be nurse's ability, reliability, trusting manner, and total physical environment variable in order.

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대형할인점의 피난대책 및 소방시설 개선방안에 관한 연구 (A Study on the Escape Measures and Fire Protection System Improvement in Discount Stores)

  • 홍성우;이영재
    • 한국화재소방학회논문지
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    • 제16권4호
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    • pp.20-27
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    • 2002
  • 본 연구는 현재 급속히 확산되고 있는 대형 할인점의 피난대책 및 소방시설 설치기준에 관한 개선방안을 제시하기 위한 것으로 주요 내용은 다음과 같다. -대형 할인매장의 피난대책. -매장의 피난시설 설치의 문제점 및 대책. -매장의 방화구획 설치의 문제점 및 대책. -매장의 옥내소화전 설치의 문제점 및 대책. 연구결과 건축계획시 면적기준에 의해 설치되는 피난계단의 경우 상주인원수에 의해 수량, 설치위치, 규격 등이 결정되어야 할 것이며, 매장 부분의 방화구획 또한 시설물 설치로 인한 장애 및 피난로 확보 차원에서 매장부분에 한하여 설치를 완화하는 대신 스프링클러 설치 기준을 강화하여야 할 것이며, 스프링클러 설치시 자진하여 옥내소화전을 추가 설치하는 경우 소화전은 상품진열 등으로 인하여 사용이 불가능한 부분이 발생하므로 매장부분에 설치되는 옥내소화전은 설치반경을 완화하여 실질적인 소화시설 사용이 가능하도록 하여야 할 것이다.