• 제목/요약/키워드: condition

검색결과 66,426건 처리시간 0.07초

고온초전도선재의 과전류 통전특성 측정 (Measurement of HTS tapes Properties under Over current condition)

  • 이광연;임형우;이희준;차귀수;이지광
    • 한국초전도저온공학회:학술대회논문집
    • /
    • 한국초전도저온공학회 2002년도 학술대회 논문집
    • /
    • pp.263-266
    • /
    • 2002
  • Rises of temperature and resistance are observed in HTS tapes under over current condition. In this paper, we measured HTS tapes properties under low-over current condition with a little temperature rise as well as high-over current condition with a large temperature rise. According to the results of measurement, rises of temperature and resistance strongly depend on insulation level and duration of over current condition.

  • PDF

회전기 고정자 권선의 절연상태 평가 (Assessment of Insulation Condition in Rotating Machine Stator Windings)

  • 김희동
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2001년도 하계학술대회 논문집 C
    • /
    • pp.1706-1708
    • /
    • 2001
  • Nondestructive tests are used to evaluate the insulation condition of stator windings in rotating machine. These tests included ac current, tan delta and maximum partial discharge. The insulation condition of stator windings was assessed by three test items. The stator windings were generally in good condition, wash, reimpregnation and rewind. It was confirmed that nondestructive tests were most useful method to indicate the insulation condition of stator windings.

  • PDF

Effect of Boundary Condition History on the Symmetry Breaking Bifurcation of Wall-Driven Cavity Flows

  • Cho, Ji-Ryong
    • Journal of Mechanical Science and Technology
    • /
    • 제19권11호
    • /
    • pp.2077-2081
    • /
    • 2005
  • A symmetry breaking nonlinear fluid flow in a two-dimensional wall-driven square cavity taking symmetric boundary condition after some transients has been investigated numerically. It has been shown that the symmetry breaking critical Reynolds number is dependent on the time history of the boundary condition. The cavity has at least three stable steady state solutions for Re=300-375, and two stable solutions if Re>400. Also, it has also been showed that a particular solution among several possible solutions can be obtained by a controlled boundary condition.

The Excitability by Both Electric and Concentrative Perturbation in CSTR

  • Bae, Jeong Min;Cho, Ung In
    • Bulletin of the Korean Chemical Society
    • /
    • 제27권8호
    • /
    • pp.1145-1148
    • /
    • 2006
  • Excitability is one of the basic and fundamental mechanisms utilized for signal transmission in living organisms. With reference to the condition by Marek and the condition by Schneider, we found a condition in which excitability with similar shapes can appear by chemical and electric perturbation. Our condition is constructed with 3 chemical channels and 1 electric channel, and can be used as a condition for a chemical spiking neuron and as a unit of a chemical spiking neural network.

우기중에 타설된 콘크리트의 품질 특성에 관한 연구 (A Study on the Quality of Concrete Place under Raining Condition)

  • 권영웅;정성철
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 1997년도 가을 학술발표회 논문집
    • /
    • pp.729-736
    • /
    • 1997
  • This paper gives the information of field concrete placed under raining condition. Experimental factors in this study are concrete strength, standard deviation and coefficient of variation. The results are as follows: 1. The strength of field concrete placed under raining condition is not largely dependent on the raining condition. 2. But, the quality of concrete is very critical.

  • PDF

INCOMPLETENESS OF SPACE-TIME SUBMANIFOLD

  • Kim, Jong-Chul
    • 대한수학회지
    • /
    • 제36권3호
    • /
    • pp.581-592
    • /
    • 1999
  • Let M be a properly immersed timelike hypersurface of $\overline{M}$. If M is a diagonal type, M satisfies the generic condition under the certain conditions of the eigenvalues of the shape operator. Moreover, applying them to Raychaudhuri equation, we can show that M satisfies the generic condition. Thus, by these results, we establish the singularity theorem for M in $\overline{M}$.

  • PDF

Transition Condition 분석에 따른 모델 최적화 연구 (Research on Model Optimization by Analysis of Condition of Transition)

  • 성봉진;정기현;최경희
    • 한국정보과학회:학술대회논문집
    • /
    • 한국정보과학회 2012년도 한국컴퓨터종합학술대회논문집 Vol.39 No.1(B)
    • /
    • pp.247-249
    • /
    • 2012
  • 본 연구에서는 MATLAB Simulink/Stateflow 기반으로 만든 모델의 transition의 condition을 미리 연산하고, 이를 바탕으로 모델을 최적화하는 모듈을 제안하고 이를 구현하였다. 구현한 모듈은 stateflow 내부의 transition condition의 label string을 이진트리로 구성하고, True/False를 판단한다. 그리고 condition의 True/False 판단 결과를 통해 모델의 최적화 과정을 수행한다. 제안하는 모듈을 이용하여 간단한 예시모델의 수정 과정을 보이고 테스트 커버리지가 향상되는 것을 검증하였다.

폭로환경하에서 규산질미분말혼합 시멘트계 도포방수재가 바탕모르터의 투수성과 세공구조에 미치는 영향 (Properties of Water Permeability and Porosity of Cement Mortar Substrate Coated with Siliceous Slurry Coating under Exposure Enviorment)

  • 김형무;오상근
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 1996년도 가을 학술발표회 논문집
    • /
    • pp.175-182
    • /
    • 1996
  • This paper deals with the properties of water permeability and porosity of cement mortar substrate coated with siliceous slurry coating under the exposure environment. Conditions of exposure enviornment are four kinds of in constant temperature water and humidity box, in indoor and outdoor exposure. Coated mortar substrate was expected continually increase in water and humidity condition, but was not in dry condition. Watertightness effect of siliceous coating was better in the condition of humidity then the dry condition, and the pore volume was decreased in that condition.

  • PDF

Nonquadratic Stability Condition of Continuous Fuzzy Systems

  • Kim, Eun-Tai;Park, Min-Kee
    • 한국지능시스템학회논문지
    • /
    • 제13권5호
    • /
    • pp.596-599
    • /
    • 2003
  • In this paper, a new asymptotic stability condition of continuous fuzzy system is proposed. The new stability condition considers the nonquadratic stability by using the P-matrix measure. Later the relationship of the suggested stability condition and the well-known stability condition is discussed and it is shown in a rigorous manner that the proposed criterion includes the conventional conditions.