• Title/Summary/Keyword: Base-Isolated Systems

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Seismic Performance Evaluation of Multi-Story Piping Systems using Triple Friction Pendulum Bearing (지진격리장치를 적용한 복층구조파이핑 시스템의 내진성능평가)

  • Ryu, Yonghee;Ju, Buseog;Son, Hoyoung
    • Journal of the Society of Disaster Information
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    • v.14 no.4
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    • pp.450-457
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    • 2018
  • Purpose: The evaluation of seismic performance of critical structures has been emerging a key issue in Korea, since a magnitude 5.8 earthquake, the worst in Koran history, struck Gyeongju, southern area in Korea on september 12th, 2016. In particular, the catastrophic failure of nonstructural components such as sprinkler piping systems can cause significant economic loss or loss of life during and after an earthquake. The nonstructural components can be more fragile than structural components in seismic behavior. Method: This study presents the seismic performance evaluation of fire protection piping system, using coupled building-piping system installed with Triple Friction Pendulum Bearings (TPBs). Kobe (Japan), Kocaeli (Turkey), and GyeongJu (Korea) were selected to consider the uncertainty of ground motions in this study. Result: In the simulation results, it was observed that the reduction of maximum displacements of the piping system with the TPBs' system was significant: Kobe, Kocaeli, and Gyeongju cases were 49%, 14.4% and 21.5%, respectively. Conclusion: Therefore, using seismically isolated system in a building-piping system can be more effective to reduce the seismic risk than a normally installed building-piping systems without TPBs in strong earthquakes.

Ecological Studies on the Causative Agents of Food Poisoning from Food Animals - 1. Patterns on the Outbreaks and Antimicrobial Susceptibility of Causative Agents Isolated from Bovine Mastiffs in a Rural Area (축산유래 식중독 세균에 관한 생태학적 연구 제1보 : 일부 농촌지역 젖소 유방염의 발생양상 및 그 원인균이 항균요법제에 관한 감수성)

  • 정희곤
    • Journal of Environmental Health Sciences
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    • v.20 no.2
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    • pp.90-98
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    • 1994
  • Introduction : Bovine mastitis is an economically and a hygienically important disease of dairy cows. Many factors predispose to bovine mastitis and an understanding of these is essential for systems of effective mastiris control to be formulated. The presence of non-pathogenic bacteria on body surfaces can protect against invasion by more pathogenic organisms. Bacteria of low pathogenicity (minor pathogens) are frequently isolated from the healthy bovine udder and may play an important role in protecting the udder from infection with pathogenic bacteria. The treatment of bovine mastitis is important for choosing adequate antimicrobias, and it take the base on the result of susceptibility to antimicrobias. Therefore, the current of numbers feeding dairy cattle were increasing and prevalence rate of bovine mastiris was occurred in 1.5~57.3%.(abbreviation)

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