• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.2
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• pp.26-30
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• 2000

In this paper, we obtain a mathematical model of a gas turbine control system from experimental data. The gas turbine in Gunsan power plant is selected as controlled system. The recursive least square algorithm is used to model the plant. For parameter estimation, plant is assumed as second order system and forgetting factor is 0.98 and the period of input and output signal period is 1sec. As a result, input and output characteristics of real system and modeling are identified.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.2
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• pp.75-82
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• 2000

This paper presents a new ventilation control model system of standby generating room installed in basement of building. The regulation problem & current status of ventilation system considered the architectural construction and building service facility procedure are also investigated. The regulation solution, ventilation control model system and its theoretical analysis for room of the generating system by driven diesel are proposed from the analyzed results of survey.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.8
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• pp.63-70
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• 2006

This paper presents design of the linear propulsion system of a high-speed (200km/h) dynamic tester for catenary-current collection. Among various propulsion systems, a permanent magnet linear synchronous motor is chosen for need of high acceleration force. The design is performed by the equivalent magnetic circuit method and verified by the finite element method. In addition, analysis of the main effects of various design variables for performance of the propulsion system has been done by using simulation-based DOE method.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.5
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• pp.62-65
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• 2000

This paper deals with the design and evaluation of the evaluation of the robust controller for a synchronous generator excitation system to improve the steady state and transient stability. The nonlinear characteristics of the system is treated as model uncertainties, and then the robust control techniques are introduced into the power system stability design to take into account these uncertainties at the controller design stage. The performance of the designed controller is examined by extensive non-linear time domain simulation. It is shown that the performance of the robust controller is superior to that of the conventional PI controller.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.11a
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• pp.18-20
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• 2015

본 논문은 마그네틱 센서 기반의 오브젝트 추적 기술을 이용한 혼합현실 선거 방송 시스템을 제안한다. 마커 기반의 증강현실 기술은 방송환경에서는 강한 조명으로 인하여 마커의 특징점 추출의 간섭 및 소실로 추적이 끊기는 문제가 있다. 특히, 선거방송와 같은 생방송 중에 그래픽이 튀거나 사라지는 것은 방송 사고와 다름없다. 따라서, 우리는 조명이나 가림의 영향 없이 추적 성능을 강인하게 하기 위해서, 무선의 마그네틱 센서를 내장한 별도로 제작한 투표함 모형을 추적하도록 하였다. 본 논문에서는 마그네틱 센서를 내장한 실물 투표함을 실시간으로 추적하게 하고, 그 정보를 증강현실 방송 시스템과 통합한 시스템 구성 및 그것을 이용한 증강현실 선거 방송 어플리케이션을 보여준다. 그 결과, 연기자가 선거정보그래픽과 연동하는 투표함을 자유롭고 직관적으로 움직일 수 있었으며, 자연스러운 증강현실 합성 결과를 얻을 수 있었다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.1
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• pp.45-53
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• 2003

For the improvement of welding performance, high-efficiency inverter system was designed and applied that system to the conventional large scale Flashbutt welder. The inverter systems are consists of full bridge PWM power control system and DSP controller. This inverter system has increased switching frequency of power control system of Flashbutt welder. For the test of application effects, we compared an our inverter control system with a conventional thyristor control system. In the results, we confirmed that our system has decreased the welding spatter amouts and improved welding performance.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.3
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• pp.87-94
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• 2003

When faults occur in a distribution network, blackout loads must be restored as fast as possible to minimize interruption of electric service. This paper presents an expert system to restore distribution networks. The system is designed to minimize switching operations in a heuristic sense by using heuristic rules. The restoration process is converted to the feasible path finding problem in the state space of expert system by application of general topological knowledge base. Multiple load transfer algorithm is proposed to deal with complex situations.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.11a
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• pp.137-140
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• 2005

항로표지용 광파표지에는 등대, 등표, 도등, 조사등, 지향등, 등주, 교량등, 등부표, 등선 등이 있으며, 이 표지들은 사용용도, 형태 및 장소에 따라 제각기 다른 전원공급시스템을 가지고 있다. 일반적인 내부 전원공급시스템은 태양전지, 충방전조절기 및 축전지로 구성되어 있으나, 계속적인 사용으로 인해 문제점들이 자주 발생하고 있다. 설문조사 결과 전체 설문대상의 63%가 축전지의 개선이 가장 시급하다고 답하였으며, 다음으로 충방전조절기가 31%의 답변을 얻었다. 이와 더불어 현재 효율적인 표지의 관리를 위하여 집약관리시스템이 도입되고 있으나, 이에 따른 추가적인 전원공급의 문제, 축전지 및 기타 장치들의 설치의 문제 및 유지 보수의 문제 등이 크게 대두되고 있다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.11a
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• pp.289-291
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• 2005

본 연구는 페러데이 효과(Faraday Effect)를 이용한 GIS용 광 CT의 개발을 위하여 출력신호의 정밀성과 안정성 향상을 위한 신호분석 시스템에 대해 검토하였다. 기존 광 CT의 Verdet 상수 의존도와 온도에 따른 특성 및 노이즈에 대한 정밀성을 개선하기 위해 신호처리 시스템 이용하여 신호를 균일화시키고 온도 보상 프로그래밍을 이용하여 온도 특성에 따른 오차를 저감시키고자 한다. 또한 신호 계측부와 신호 처리부를 분리하여 신호 처리부를 프로그래밍 시켜 실시간으로 광 CT 특성을 모니터링 할 수 있는 시스템을 연구 검토하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.3
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• pp.91-96
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• 2001

This paper describes the effect of an overhead ground wire in Power distribution lines of electric railways due to direct lightning strokes. Using the EMTP, the effects of an overhead ground wire and a s-horn are analyzed quantitatively. Also, the influences of the structure of electric railways and of peak value and time-to-half value of a stroke currents are evaluated. The analysis show that in installation of in overhead ground wire into a existing railway system, the induced voltage in power distribution lines of electric railways in suppressed.