• 한국자동차공학회논문집
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• 제3권6호
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• pp.262-273
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• 1995

For rotating machinery with high speed and high efficiency, large labor and high expenses are required to conduct machine health monitoring. Therefore, it becomes necessary to develop new diagnosis technique which can detect abnormalities of the rotating machinery effectively. In this paper, it is identified that bispectrum analysis technique can be successfully applied to dectect the abnormalities of the roating machinery through computer simulation, and results of the bispectrum analysis are patterned in griding form. Further, pattern recognition technique using back propagation algorithm, which is one of neural network algorithm, being consisted of patterned input layer and output layer for abnormal status, is applied to detect the abnormalities of simulator which is able to make up various kinds of abnorml conditions(misalignment, unbalance, rubbing etc.) of the rotating machinery.

• 대한전자공학회논문지
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• 제27권1호
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• pp.10-19
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• 1990

A fault tolerant control system, in which a digital back-up controller system is added on the existing analog control system, is developed for enhancing reliability of boiler control system in power plant. The digital back-up controller system(DBCS) has a multi-processor structure with capabilities of fault diagnosis, back-up control, self test, and graphic monitoring. Specifically, switching mechanism composed of expandable modules is designed so that back-up controller takes over any faulty control loops and the number of back-up control loops is determined as that of simultaneous faults. A process simulator that simulates the boiler analog control system is developed for safety test and performance evaluation prior to real plant application. DBCS is installed at the Ulsan thermal power plant, and fault tolerant control performance is assured under the faults that some controller modules are pulled out.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1999년도 춘계학술대회 논문집
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• pp.259-266
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• 1999

This paper is intended to provide a method to design control software for the TCMS, train control and monitoring system. The TCMS with this control software will be applied KOREA Standard EMU. The control software is designed by SCADE Case tool to concern safety and reliability. The function for the EMU is implemented in software easily programmed, using a functional block, graphic programming language. The control software has modular design and each module is tested with SCADE simulator. This time we focus a door control module, present a design method and a simulation method for that module.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2000년도 춘계학술대회 논문집
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• pp.161-167
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• 2000

주제어실의 경보계통은 중요한 발전소 변수의 비정상 상태 발생과 운전원의 관심을 요하는 기기상태의 변화에 대해 가시적/가정적 신호로 운전원에게 경고하는 역할을 담당하는 역할을 한다. 본 논문에서는 전력연구원에서 수행중인 '원자력 교육원 시뮬레이터 성능개선' 과제의 일부로 원자력교육원 2호기의 기준발전소인 영광 1호기의 디지털 경보설비 (IAS : Intelligent Annunciator System)의 구조와 이를 시뮬레이터 주컴퓨터 (Host Computer)상의 다이나믹 모델과 연동시켜 구현하는 방법론 및 구현된 경보감시계통에 대해 다루고 있다. 원자력교육원 2호기 경비감시계통은 Trend 모드, 그룹모드, 윈도우 모드, 조치사항 모드 및 조치사항 등록 모드 등 총 5개의 모드로 구성되어 있으며, 발생된 경보의 시간별/그룹별 출력, 경보창 에뮬레이션과 임의의 창에 대한 조치사항 출력, 새로운 경보에 대한 등록 및 삭제 등의 기능 구현이 가능하다. 또한 시뮬레이터에 대한 규제기관의 인허가가 중요한 현안으로 대두될 전망임에 따라 ANSI/ANS-3.5, Regulatory Guide 1.149 등 규제요건에서 제시하는 성능기준 및 검사기준을 만족하도록 설계함으로 향후 규제기관에 대한 인허가 획득을 대비하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 B
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• pp.537-539
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• 1998

In this paper, we construct the on-line model structure for the nonlinear process systems using the adaptive fuzzy-neural network. Adaptive fuzzy-neural network usually consists of two distinct modifiable structure, with both, the premise and the consequent part. These two parts can be adapted by different optimization methods, which are the hybrid learning procedure combining gradient descent method and least square method. To achieve the on-line model structure, we use the recursive least square method for the consequent parameter identification of nonlinear process. We design the interface between PLC and main computer, and construct the monitoring and control simulator for the nonlinear process. The proposed on-line modeling to real process is carried out to obtain the effective and accurate results.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 춘계학술대회 논문집
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• pp.360-367
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• 2000

This paper is intended to provide a method to design control software for the TCMS, train control and monitoring system. The TCMS with this control software will be applied KOREA Standard EMU. The control software is designed by SCADE Case tool to concern safety and reliability. The function for the EMU is implemented in software easily programmed, using a functional block, graphic programming language. The control software has modular design and each module is tested with SCADE simulator. This time we focus a Driving control module, including brake control module, and present a design method and a simulation method for that module.

• Nuclear Engineering and Technology
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• 제48권1호
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• pp.129-143
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• 2016

Sometimes, we need or try to figure out somebody's thoughts from his or her behaviors such as eye movement, facial expression, gestures, and motions. In safety-critical and complex systems such as nuclear power plants, the inference of operators' thoughts (understanding or diagnosis of a current situation) might provide a lot of opportunities for useful applications, such as development of an improved operator training program, a new type of operator support system, and human performance measures for human factor validation. In this experimental study, a novel method for inference of an operator's thoughts from his or her eye movement data is proposed and evaluated with a nuclear power plant simulator. In the experiments, about 80% of operators' thoughts can be inferred correctly using the proposed method.

• 한국전자통신학회논문지
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• 제2권2호
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• pp.75-82
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• 2007

무선 센서 네트워크는 다수의 센서 노드로 구성되며, 센서 노드들의 협력 작업을 통해 하나의 공통 작업을 수행한다. 본 논문은 무선 센서 네트워크에서 발생하는 일시적인 혼잡상황을 제어하기 위해 기존의 ECN 메커니즘과 크로스 레이어 기술을 적용한 혼잡제어 메커니즘을 제안하였다. 성능분석을 위해 NS-2 시뮬레이터를 이용하여 무선 센서 네트워크에 혼잡상황 발생시 싱크 노드에서의 패킷 처리율을 분석하였다. 시뮬레이션 결과는 제안된 메커니즘이 무선 센서 네트워크의 혼잡에 효과적으로 대응함을 나타내었다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2000년도 추계학술대회논문집
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• pp.809-814
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• 2000

이 연구의 목적은 비침투적으로 펌프의 유량을 알아내고, 이를 이용하여 펌프의 성능을 감시하는데 있다. 그리고 운전중인 펌프의 상태를 감시함으로써 펌프의 결함을 진단하는데 있다. 위 목적을 달성하기 위하여 본 연구에서는 비침투적으로 측정이 가능한 변수인 모터 토크와 회전속도를 이용하여 펌프의 성능을 예측할 때 필수석인 유량을 알아내는 Simulator를 개발하였다. 유량의 변화를 감시함으로써 펌프의 성능 변화를 감시하는 일반적인 방법을 적용하면 펌프의 성능을 효율적이며 경제적으로 감시를 하는데 이용할 수 있다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 추계학술대회 논문집
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• pp.255-261
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• 1998

The train automatic operation control system is an on-board train control system that is widely adopted in modern rapid transit systems. The control system consists of TCMS(Train Control and Monitoring System), ATC(Automatic Train Control), ATO(Automatic Train Operation) and TWC(Train to wayside communication) in the train and wayside facilities. The functions of the system is to regulate train riding comfort, to service limited speed and smoothness during start, acceleration, constant speed travel, and fixed point parking under the corresponding commands. The paper describes the simulation model of the train automatic operation control of subway system, configuration of simulator hardware and software and operational algorithms.