• 제목/요약/키워드: Component test

검색결과 2,829건 처리시간 0.035초

홍삼 조사포닌 성분의 중추작용 (The Central Effects of Red Ginseng Total Saponin Component)

  • 이순철;이수정
    • Journal of Ginseng Research
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    • 제19권1호
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    • pp.22-26
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    • 1995
  • The present study was undertaken to elucidate the characteristics of red ginseng total saponin in behavioral changes on ambulation, forced swim test and convulsion in mice. The ambulation and the duration of immobility on forced swim test were not affected by red ginseng total saponin. On the other hand, the duration of immobility inducted by DMI, PGL but not CIP was significantly decreased, and the onset of convulsion induced by pentylenetetrazole was significantly shortened by preadministration of red ginseng total saponin. These results suggest that red ginseng total saponin component may play an important role in modulating synergism with drugs acting on depression and convulsion, and that the characteristics of synergetic effect induced by red ginseng total saponin potentate the central norepinephrine neuron activity.

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Gel형 인화성 용제 Compound의 특성 (Properties of Gel-like Compounds Containing Flammable Solvents)

  • 강영구;김정훈
    • 한국안전학회지
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    • 제18권3호
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    • pp.94-100
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    • 2003
  • Gel-like compounds containing flammable solvents were prepared to use fur cleaning agents in field of innovative industries and general purposes. And experiments were conducted to improve the defects of liquified flammable solvents from the view point of safety and health hazards. Flammable solvents used in this study were several single component flammable solvents(turpentine oil, N-methyl-2-pyrrolidone(NMP), d-limonene) and multi component flammable solvent(gasoline and ethanol). For gelation of flammable solvents, commercially Known as Aerosil(equation omitted) 200 fumed silica and triethanolamine(TEA) were used as gelation agent dispersant. The analyses on properties of gel-like compounds was studied by gelation and viscosity test pH test, volatility test and differential scanning calorimetry(DSC) measurement. The experimental results indicate that gel-like compounds containing flammable solvents have pH stability, high viscosity, volatile organic compounds(VOC) control by the decrease of volatility and odor component generation, fluidity control etc. From the experimental values, it can be predicted that the safety in the working place is improved by manufacturing flammable solvents into gel-like compounds.

체계수명시험에서 얻어진 부품의 수명자료를 이용한 Freund 모형의 추정 (Estimation of Freund Model for System Level Life Testing Using Component Life Data)

  • 홍연웅
    • 품질경영학회지
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    • 제26권2호
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    • pp.27-38
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    • 1998
  • Consider a life testing experiment in which multiple two-component shared parallel systems are put on test, and the test is terminated at a specified number of system failures. The bivariate data obtained from such a system-level life testing can be classified into three classes: 1) the case of failed two components with known failure times, 2) the case of censored two components, and 3) the case of one censored component and the other failed component of which the failure time might be known or unknown. Under this censoring scheme and the assumption of Freund's bivariate exponential life distribution, the maximum likelihood estimators are obtained. Results of comparative studies based on Monte Carlo simulation are presented.

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MMC 기반 HVDC 전력변환기의 밸브 성능 시험회로 (Performance Test Circuit for a Valve of MMC Based HVDC Power Converter)

  • 배치환;조광래;김학수;노의철
    • 전력전자학회논문지
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    • 제28권1호
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    • pp.76-81
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    • 2023
  • A new test circuit for an MMC-based valve HVDC power converter is proposed. The proposed scheme satisfies the required clauses from IEC-62501. The valve test current contains second harmonic component and DC offset as well as a fundamental component that is quite similar to the real operating arm current of MMC based HVDC power system. The structure of the proposed test circuit is simple compared to conventional test circuits. Furthermore, the power supply voltage rating of the proposed test circuit is reduced dramatically around 20% of the conventional scheme with the same current rating. The validity of the proposed test circuit is verified through simulation and experimental results.

철도차량용 대형 알루미늄 압출재 용접부의 피로강도 평가 (Fatigue Strength Evaluation of Butt Welded Aluminum Alloy Component for Railway Vehicles)

  • 한승우;이학주;이상록
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2000년도 춘계학술대회 논문집
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    • pp.242-249
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    • 2000
  • The fatigue strength of welded aluminum alloy component has been evaluated. Extruded aluminum alloy component Al 6005-T6 was considered. That component could be one of appropriate candidates for floor structure in railway cars. Finite element analysis has been performed to obtain stress distribution in the welded aluminum component. The results of finite element analysis have been applied in designing the experimental setup for fatigue strength evaluation of welded component. Three point bending fatigue test has been employed, until fracture occurs, to evaluate the fatigue strength of the welded component. In addition, the fatigue strength of the component has been compared with that of specimen.

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두 개의 부품으로 구성된 시스템의 단계적 충격생명검사에 관한 연구 (On a bivariate step-stress life test)

  • 이석훈;박래현;박희창
    • 응용통계연구
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    • 제5권2호
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    • pp.193-209
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    • 1992
  • 정상조건에서 수명이 상당히 긴 두 개의 부품으로 구성된 직렬형 시스템의 생명검사(Life Test)를 현실적으로 수행하기 위하여 제안된 단계적 충격생명검사에 관하여 고찰하였다. 모형화 단계에서 우리는 특별히 시스템내에서 작동하는 두 부품의 수명을 나타내는 확률변수가 Block과 Basu(1974)에 의해서 제안된 이변량 지수분포를 따르는 경우를 논의하여, 이에 상응하는 충격누적에 관련된 기존모형을 변형 제안하였고, 직렬형 시스템내의 부품간 수명의 종속관계를 포함하는 정보와 부품의 독자적인 생명검사로부터 얻는 정보를 통합하는 모형을 제안하여 시스템내에서 갖는 부품의 분포에 관하여 논의하였다. 한편 자료분석 단계에서는 기본적으로 최대우도 추정법을 초기값의 설정방법을 중심으로 토의하고 모수의 근사 분산, 공분산의 구조를 이용하여 단순검사의 최적시점을 설정하는 방안을 제시하였다.

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승용차 서브프레임용 고무부시의 동강성 예측 (Estimation of Dynamic Characteristics of a Rubber Component for Subframe in Automobile Vehicle)

  • 안태길;구준환;김주성;이용헌;김기주;최병익;이학주;우창수;김경식
    • 한국소음진동공학회논문집
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    • 제20권10호
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    • pp.907-914
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    • 2010
  • While rubber components are extensively used in automobile vehicle, there are still a lot of difficulties in designing the rubber components applied in complex shapes and preloaded states because of the complicated material properties. In this paper, an efficient experimental method is suggested, which estimates the dynamic stiffness of a rubber component using rubber material test and static stiffness of the bush. And it is verified by comparing with FEM predictions and experimental results. This method is capable of predicting the dynamic stiffness of a rubber bush under various load conditions from minimized test data. Also it estimates dynamic characteristics of a rubber component using rubber material test and FEM calculation.

위성항법 시뮬레이션 작업을 동적으로 지원하는 테스트 프레임워크 (A Test Framework for Dynamically Supporting the Simulation Works of the Global Navigation Satellite Systems)

  • 국승학;김현수;이상욱
    • 인터넷정보학회논문지
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    • 제10권6호
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    • pp.191-203
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    • 2009
  • 시뮬레이션은 어떤 문제를 모의적으로 실험하여 그 특성을 파악하는 작업이다. 시뮬레이션 과정에서는 시뮬레이션 모델, 알고리즘, 입출력 데이터의 교체 및 변경이 빈번하게 발생한다. 특히 알고리즘의 교체를 통한 시뮬레이션 작업의 경우 알고리즘을 구현한 컴포넌트가 교체될 때 기능적으로 정확하게 동작하지 않는다면 시뮬레이션 작업을 성공적으로 수행하기 어렵다. 이 논문에서는 소프트웨어 기반 위성항법 시뮬레이션 환경에서 교체될 컴포넌트가 기능적으로 정확하게 구현되어 있는지를 검증하기 위한 테스트 프레임워크를 제안한다. 이 프레임워크는 컴포넌트가 교체되는 시점에서 교체되는 컴포넌트의 상황에 맞게 기능 테스트를 수행할 수 있게 해준다.

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전동차 구동대차의 구조해석 및 하중시험 비교 고찰 (A Comparision on Structure Analysis and Load Test of Driving Bogie for Electrical Multiple Unit)

  • 김원경;윤성철;권성태;박옥정
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.404-409
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    • 2005
  • This paper describes the result of structure analysis and load test for bogie frame. The purpose of the analysis and test is to evaluate an safety which body structure shall be considered fully sufficient rigidity so as to satisfy proper system function under maximum load. Bogie system consists of bogie frame, suspensions, wheel-sets, braking system and transmission system. Among these component, the bogie frame is most significant component subjected to the vehicle and passenger loads. The evaluation method is used the JIS E 4207 specification throughout the FEM analysis and static load test. The analysis and test results have been very safety and stable for design load conditions.

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