• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.6
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• pp.1403-1412
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• 2019

Effect of damage and loss cost for downtime is huge, if physical devices such as turbines, pipe, and storage tanks are in the abnormal state originated from not only aging, but also cyber attacks on the control and monitoring system like PLC (Programmable Logic Controller). To improve availability and dependability of the physical devices, we design and implement an indirect health monitoring system which sense temperature, acceleration, current, etc. indirectly, and put sensor data into Influx DB in real-time. Then, the actual performance of detecting abnormal state is shown using the indirect health monitoring system. Analyzing data are acquired using the real-time indirect health monitoring system, abnormal state and security threats can be double-monitored and lower maintenance cost utilizing prognostics and health management.

• Journal of the Korean Data and Information Science Society
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• v.21 no.1
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• pp.109-119
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• 2010

FRACAS (Failure Reporting, Analysis and Corrective Action System) is intended to provide management visibility and control for reliability and maintainability improvement of hardware and associated software by timely and disciplined utilization of failure and maintenance data to generate and implement effective corrective actions to prevent failure recurrence and to simplify or reduce the maintenance tasks. This process applies to acquisition for the design, development, fabrication, test, and operation of military systems, equipment, and associated computer programs. This paper shows the FRACAS development process and developed FRACAS system for a defense equipment.

• Proceedings of the KIEE Conference
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• 2006.10d
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• pp.31-33
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• 2006

전력수요의 증가에 대하여 전력을 공급하는 발전기의 대용량화, 고전압화 소형경량화 됨에 따라 발전기 고장 예방을 위한 진단이 더욱더 중요시되고 있다. 이들 발전기의 전기적 고장의 대부분은 고정자 및 회전자 권선에서 발생하며 이의 고장을 복구하는데 장시간이 요구되므로, 발전기의 예측진단에 따른 정비와 더불어 고장을 미연에 발견하고 불시정지에 따른 파급을 막기 위해서는 상시감시가 요구된다. 본 연구에서는 소용량 동기발전기를 이용하여 발전기 회전자권선의 단락 고장진단을 위한 공극에서의 자속패턴을 상용 전자장해석 전문프로그램을 이용하여 수치적으로 계산하여 도출하였으며, 또한 실제 회전자 권선 단락 실험을 통하여 실제 공극에서의 자속패턴과 전자장 해석결과와 비교를 하여 전자장 해석결과의 신뢰성을 확보 하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.355-357
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• 2017

With the development of automation technology and the increase of large-scale automation projects, sensors used for state monitor and parameter measurement have become more and more important. Once the sensor faults occur, which will lead to the degradation of automation system's performance, and even disastrous consequences. In this paper, sensor output value modeling is performed using Kung's Algorithm for direct fault diagnosis of sensor, and fault diagnosis method based on decision theory is presented.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.2
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• pp.189-194
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• 2015

In this paper, We study case for rotary machine with a breakdown analysis. Also We analyze the solution of the safety and the future breakdown of the each rotary machine through vibration analysis using measurement data. The implementation of the measurement and the test results are discussed. The result that is applied condition Monitoring & Diagnostics on this paper show the future breakdown of rotary machine.

• KSCI Review
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• v.14 no.2
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• pp.117-122
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• 2006

In this paper, we designed and implemented the DCS(Distributed Control System) terminal remote monitoring board for build total unified management system based wireless communication on automatic control system fields. Also, it tested and evaluated for check an usability and performance. The board monitored relay and fuse status at power management room real-time. Therefore, we expected economic effects extend relay life-time that pre-detected errors and prevented relay fault.

• KSCI Review
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• v.15 no.1
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• pp.219-223
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• 2007

이 논문에서는 기존 개발된 일체형의 통합 터미널 보드의 유선방식으로 자동제어시스템에서의 중요 신호에 대한 전체적 통합관리시스템 구축을 위한 DCS터미널 원격 감시 보드를 설계 제작하고 제작된 보드의 동작을 테스트하기 위해 원격감시 프로그램을 구현하여 기능을 평가한다. 구현된 원격감시보드는 전원관리실의 각 릴레이들의 동작상태 및 릴레이와 퓨즈의 이상 유무를 실시간으로 확인이 가능하며 릴레이의 수명을 고려하여 릴레이의 고장을 사전에 예방함으로써 산업분야의 경제적인 효과가 기대된다.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.9 no.2
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• pp.68-78
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• 1995

Until now, the electrical monitoring system had been used of the Graphic-Mosaic panel, which is located to the cellar at the apartment complex. it was inappropriated to man-power and system-organization at apartment complex. for that reason, in this paper IMS is presented. An Intelligent Monitoring System can provide and explanation of real-time opera- state of an electric power apparatus to its operators in apartment complex. IMS is proposed as a model for integration supervisory system whose primary tasks are to communicate line data with host-computer and slave-controller it is based on a generalized version of use-career and a trouble shoot knowledge base for diagnostic problem solving. to operate it, both of controller and its operator-view is deigned by the real-tune O.S TREND 940.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.400-402
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• 2008

제주도의 지속적인 전력수요 증가에 능동적으로 대처하고자 육지-제주간 초고압 직류연계(HVDC) 추가 건설사업이 추진 중에 있다. 초고압 직류 송전계통을 신뢰성 있게 운전하기 위해 양측 변환소에 설치될 제어 및 감시계통간 정보전송로의 화보는 매우 중요하다. 본 논문에서는 고품질, 대용량화 되어가는 전력데이터를 안정적으로 전송하고 해저케이블 고장감시 및 향후 정보 통신 분야의 부가가치 창출을 위한 최적의 해저광통신케이블을 소개하고자 한다.

• Journal of Advanced Navigation Technology
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• v.15 no.1
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• pp.18-24
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• 2011

This paper proposes fault diagnosis system which is able to diagnose the fault from present operating condition by analyzing monitored signals with present ship monitoring system without additional sensors. For this all kinds of ship's engine room monitored data are classified with combustion subsystem, heat exchange subsystem and electric motor and pump subsystem by analyzing ship's operation data. To extract dynamic characteristics of these subsystems, log book data of container ship of H shipping company are used.