• 제목/요약/키워드: IK system

검색결과 2,313건 처리시간 0.034초

자가면역성 뇌척수염 랫드의 중추신경계에서의 인산화된 IkB의 발현양상 (Expression and localization of phospho-IkB in the central nervous system during experimental autoimmune encephalomyelitis in Lewis rats)

  • 황인선;지영흔
    • 대한수의학회지
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    • 제45권1호
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    • pp.7-15
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    • 2005
  • To elucidate the roles of phospho-IkB expression in the development and progression of EAE, we investigated the expression of phospho-IkB in the central nervous system (CNS) of rats during experimental autoimmune encephalomyelitis (EAE) using immunohistochemistry and Western blot analysis. In Western blot analysis, the increased expression of phospho-IkB went parallel to severity of EAE. The expression of phospho-IkB increased significantly at the peak stage of EAE followed by gradual decrease. Immunohistochemical studies showed that the phospho-IkB immunoreactivity was mainly expressed in inflammatory cells (macrophages, T cells) and glial cells (astrocytes, microglial cells) at the peak stage of EAE and disappeared at the recovery stage. These findings suggest that the phosphorylation of IkB is closely associated with autoimmune inflammation in the CNS and plays an important role in the initiation and progression of EAE.

고효율기기의 보급확산에 따른 전력시스템 공급신뢰도의 영향분석 (Analysis on the Power System Reliability Characteristics according to the High-Efficient End-Use Diffusion)

  • 장승찬;황성욱;조형준;김정훈;김발호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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    • pp.239-241
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    • 1998
  • The probabilistic production simulation of power system generally has been used to formulate a reasonable power production plan or generation planning. It integrates the convolution process of a generating unit's random outage(FOR) with equivalent load duration curve(ELDC), and provides the reliability indices of power system. This paper presents the reliability characteristics of power system reflected on demand side management and proposes the modified ELDC representation technique due to the high-efficient end-use diffusion among the customers. Load reductions are simulated from the multi-state deconvolution process with the saved capacity of end-use. Case study shows the computed reliability from the power system production simulation incorporated with DSM planning scheme.

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보수계획을 고려한 건물용 열병합 발전의 최적 운전비용 산출 모델 (Optimal production cost evaluation model of cogeneration system for buildings including maintenanace scheduling)

  • 김유신;박종성;유지상;김정훈
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1995년도 하계학술대회 논문집 B
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    • pp.559-561
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    • 1995
  • The cogeneration system has a strong merit in providing thermal and electrical energy simultaneously. Nowadays, cogeneration system is widely used in the point of efficient use of the energy resources And the installation of the system is expected to be greatly increased in each year. So, we need to develop an optimal operation planning for those systems. In this paper, we are used to result what studed at the my power system of room because it is in order to solve maintenance scheduling problem. Also we added a constraints to the proposed maintenance model for optimal maintenance rate. In the case study, we construct an multi-machine generated example system which operated in topping cycle, and calculate the yearly optimal production cost, marginal maintenance cost, and maintenance scheduling of the example system respectively.

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전문가 시스템을 이용한 부하 구성비 추정 (Estimation of Load Composition by Expert System)

  • 김정훈;임재윤;이재혁;김형섭
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1991년도 하계학술대회 논문집
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    • pp.345-349
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    • 1991
  • The accurate simulation of the static and/or dynamic response of a power system requires detailed knowledge of the behavior of the loads. For the Precise load model, the chearacteristics and the composition of the load are needed. In this papers, the reliable estimation method of load composition is suggested intruducing knowledge-based system though it used various weekly-reliable survey data.

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SC-OPF의 민감도 계수를 이용한 발전기 기동.정지계획 (The Unit Commitment Using the Sensitivity Factor of Security Constrained Optimal Power Flow)

  • 김광모;정구형;한석만;김발호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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    • pp.416-417
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    • 2006
  • The recent movement to deregulated and competitive electricity market requires new concepts against existing central dispatch in the system operation and planning. As power systems tend to be operated more closely to their ultimate ratings, the role of SCOPF(Security Constrained Optimal Power Flow) is changed. This paper deals with the proper Unit Commitment condition changed according to the conditions or configuration of power system. This goal of is paper is to obtain proper security and Optimal UC condition through the efficient usage of the sensitivity Factor against critical contingencies. The proposed mechanism has been tested on a sample system and results show more secure conditions against critical contingencies.

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부하 중심점 개념의 전력 시스템 정태 등가 축약 (Load Center Concept Equivalent by T/L Loss Identification)

  • 백수열;김정훈;심건보;이봉용
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1992년도 하계학술대회 논문집 A
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    • pp.149-152
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    • 1992
  • A simple and practial equivalent technique has been presented in this study. Arbitrary number of bus system can be aggregated to the equivalent one-bus system, equivalents are totel real, and reactive bus powers and T/L losses viewing form boundary buses. Variables to be determined are line impedance between boundary buses and the equivalent bus, voltage and angle of that bus. IEEE 14 bus system is used to demonstrate the proposed method. even in contingency cases very good results have been obtained

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부하모델을 고려한 전압 안정도 평가지표개발과 시스템 안정도 연구 (A Study on Developing Voltage Stability Index arid System Stability by Incorporating Dynamic Load Modeling)

  • 위원석;함정필;추진부;김정훈
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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    • pp.187-189
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    • 1999
  • Accurate load models allow more precise calculations of power system stability, This paper presents new static voltage stability index considering the load models. Also, We apply the load models for the existent voltage stability indices, and evaluate them.

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경쟁적 전력시장에서 송전선로 상정사고를 고려한 선행급전 알고리즘 개선에 관한 연구 (A Study on an Improving Contingency Constrained Pre-Dispatch Algorithm in a Competitive Electricity Market)

  • 김광모;신혜경;강동주;한석만;정구형;김발호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.806-807
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    • 2007
  • Systematic studies on the dispatch scheduling algorithm and related constraints can enhance the effectiveness of electricity market operation. When System Operator (SO) establishes a dispatch schedule, the bid information should be preserved in the schedule as much as possible. In this paper, we introduce a new type of sensitivity factor called Line Outage Impact Factor (LOIF) to screen a transmission line causing the most severe outage when scheduling the dispatch. This screening can assure the stable system operation and make an efficient feedback between the SO and market participants. We propose a transmission line contingency constrained Pre-dispatch algorithm using sensitivity indices in a suitable Pre-dispatch scheduling. The proposed algorithm has been tested on sample system and the results show more secure operation against critical contingencies.

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현장인발시험을 통한 섬유형 쏘일네일의 거동특성 평가 (Evaluation of Behavior Characteristics of Geosynthetic Fiber Nail System from the Field Pull-Out Tests)

  • 김홍택;박시삼;조병국;정성필
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2004년도 춘계학술발표회
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    • pp.342-347
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    • 2004
  • Excavation nearby the existing structures is being performed vigorously to get the greatest use of land along with fast economic growth in the downtown area. The application of soil nailing system gradually increases because of an advantage of soil nailing system adjacently constructed in the existing structures. In this study, friction resistance by pull-out is considered as main resistance except resistance formed by flexural rigidity of nail observing that resistance of flexural rigidity is about $0{\sim}15\;%$ of whole safety factor according to degree of flexural rigidity in general soil nail wall and application of geosynthetic fiber soil nailing system is evaluated through laboratory tensile strength test and field pull-out test.

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최적조류계산 분산처리 기법의 비교 (A Comparison of Distributed Optimal Power Flow Algorithm)

  • 김호웅;박만근;김발호;김정훈
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 C
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    • pp.1046-1048
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    • 1999
  • This Paper compares two mathematical decomposition coordination methods to implementing the distributed optimal Power flow(OPF) using the regional decomposition: the Auxiliary Problem Principle(APP) and the Alternating Direction Method(ADM), a variant of the conventional Augmented Lagrangian approach. A case study was performed with IEEE 50-bus system.

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