• 한국초전도ㆍ저온공학회논문지
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• 제7권4호
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• pp.20-23
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• 2005

The Resistive Type High Temperature Superconducting Fault Current Limiter (SFCL) has been developed in many countries. Until now, materials of the resistive SFCL were Bi2212 bulk and YBCO thin film. Although YBCO coated conductor (CC) has many advantages such as high n-value and critical current for applying resistive SFCL, the resistive SFCL using CC doesn't have developed yet. The bifilar winding type SFCL was manufactured and tested rated on 30V/80A. In normal state, the SFCL using pancake type bifilar winding had very low impedance. When a fault occurred, the SFCL limited the fault current efficiently. Through these results of experiment, large-scale SFCL using CC should be developed in the future.

• 대한전기학회논문지:전력기술부문A
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• 제48권6호
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• pp.712-718
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• 1999

When a fault occurs in power transmission systems, protective relays play a roles of protecting the power system according to there setting values. Therefor, it is important that protective relays have high selectivity and sensitivity by correct setting the involves a large volume of data and is a complicated and very tedious, therefore vulnerable to the human errors. Also, it is very difficult to verify that the relays have correct operating parameters before the fault occurs. This paper porposed a method to testify the reliability of realys by showing the operation response to faults in the simulation of the real power system operation environment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.27-29
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• 2001

As the amount of electric power consumption is increasing rapidly, the power systems are complex and growing larger. It is required that the quality of electricity is better. To satisfy this demands It is required to analyze the data of the fault accurately and then to find a cause and to enforce a countermeasure. We analyzed the fault of transmission & substation installation over 66kV statistically to operate the power system well. We introduced the faults that are classified into the cause, the facilities, the voltage. This paper explains the experience of the fault in electric power coporation that is operating the large power system. This paper will be meaningful. because this paper gives the data of real power system. We wish that the reliability of power suppliment will be improved, as using this paper properly and this paper is helpful to the growth of this field and the development of technology.

• 정보처리학회논문지A
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• 제12A권5호
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• pp.421-426
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• 2005

대규모 병렬 연산에 있어서, 계산 노드 혹은 이들을 연결한 통신 네트워크의 장애는 연산 실패로 끝나며, 소중한 계산 시간이 낭비된다. 그러나 현재의 MPI 표준은 이에 대한 대안을 제시하지 않고 있다. 본 논문에서는, 비표준의 무정지형 MPI 라이브러리가 아닌 MPI 표준 함수들만을 사용하여, MPMD 방식의 비동기 연산을 도입한 응용 수준의 무정지형 선형 시스템의 해법을 제안한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2272-2275
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• 2002

PCA(Principle Component Analysis) has emerged as a useful tool for process monitoring and fault diagnosis. The general approach requires the user to identify the root cause by interpreting the residual or principle components. This could be tedious and often impossible for a large process. In this paper, PCA scheme is combined with the FCM-based fault diagnostic algorithm to enhance the diagnosistic results. The implementation of the PCA-FCM based fault diagnostic system is done and its application is illustrated on the two-tank system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 B
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• pp.746-748
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• 1997

The parity relation approach for the fault detection and isolation (FDI) of a large diesel engine actuator position servo system is presented. Main purpose of the FDI system is to detect and isolate two important faults, actuator fault and sensor fault, that, if not detected and compensated, degrade the overall system performance. Simulation results are given to show the practical applicability of the FDI scheme.

• Earthquakes and Structures
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• 제1권3호
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• pp.253-267
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• 2010

A novel simple approach is presented for the seismic analysis of continuous buried pipelines subject to fault ruptures. The method is based on the minimization of the total dissipated energy during faulting, taking into account the basic factors that affect the problem, namely: a) the pipe yielding under axial and bending load, through the formation of plastic hinges and axial slip; b) the longitudinal friction across the pipe-soil interface; c) the lateral resistance of soil. The advantages and drawbacks of the proposed method are highlighted through a comparison with previous approaches, as well as with finite element calculations accounting for the 3D kinematics of the pipe-soil-fault systems under large deformations. Parametric analyses are also provided to assess the relative influence of the various parameters affecting the problem.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.355-357
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• 2017

최근 자동화 기술의 발전으로 산업체에는 대규모 자동화 시스템으로 변화되고 있다. 그에 따른 시스템 감시와 파라미터 측정에 사용되는 센서 또한 자동화 시스템에서 중요한 요소로 차지하고 있다. 따라서, 자동화 시스템에서 센서의 고장으로 인한 시스템 오작동으로 고장이 발생한다면 경제적 피해 및 인명피해를 초래할 수 있다. 본 논문에서는 센서의 직접적인 고장진단을 위해 Kung's Algorithm을 이용하여 센서 출력값 모델링과 결정이론을 통한 고장진단방법에 대해 제시한다.

• 산업경영시스템학회지
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• 제22권53호
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• pp.111-120
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• 1999

The advent of very large scale integration(VLSI) has had a tremendous impact on the design of fault-tolerant circuits and systems. The increasing density, decreasing power consumption, and decreasing costs of integrated circuits, due in part to VLSI, have made it possible and practical to implement the redundancy approaches used in fault-tolerant computing. The purpose of this paper is to study the many aspects of designing fault-tolerant systems in a VLSI environment. First, we expound upon the opportunities and problems presented by VLSI technology. Second, we consider in detail the importance of design mistakes, common-mode failures, and transient faults in VLSI. Finally, we examine the techniques available to implement redundancy using VLSI and the promlems associated with these techniques.

• 전기학회논문지
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• 제58권11호
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• pp.2089-2094
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• 2009

The fault current has increased due to growth of distributed generations for the large power demand in power distribution system. To solve some problem such as excess of the circuit breaker's cut-off ratings, the superconducting fault current limiter(SFCL) has been progressed. However, the operational characteristics of the relay is changed by SFCL. Therefore, the proper impedance for the SFCL should be selected to keep protective coordination with the SFCL when SFCL is introduced on the neutral line of main transformer in distribution system. In this paper, the proper normal conducting resistance was suggested to solve the problem in case of the protection coordination with SFCL.