• 한국정밀공학회지
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• 제10권2호
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• pp.22-29
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• 1993

A remote control system was developed in order to operate by push-buttons the conventional drum and chute components, which have been operated manually, in a concrete mixer-truck. As actuators, a hydraulic power unit was used for chute operations: two DC motors for drum operations. The devised drum controller consisted of three electric circuits : an analog proportional-integral control circuit, a drum acceleration circuit, and an emergency stop circuit. The remote control system was installed to be tested experimentally and then was evaluated to work successfully with a desirable accuracy.

• 전기학회논문지
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• 제66권12호
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• pp.1830-1835
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• 2017

8200 Series Electric Locomotives are mostly imported from overseas due to aging and uncertainty of source technology, and it's the maintenance cost is increasing. We are analyzed life cycle costs based on international standards such as IEC 60300-3-3 and IEC62278. The main conversion system of the 8200 series electric locomotive is closely related to vehicle operation and is one of the subsystems requiring frequent maintenance. In this paper, the life cycle cost of the main conversion unit in 8200 series electric locomotive is analyzed based on the maintenance manual. As a result of analysis, maintenance cost of GTO module and control device is relatively high, and it is confirmed that the cost increases according to the useful life.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2008년도 춘계학술발표대회
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• pp.830-832
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• 2008

변전설비 감시제어시스템은 그 목적상 실시간의 대규모 측정정보 취득을 목적으로 한다. 취득정보는 RTU(Remote Terminal Unit)를 통해서 감시제어시스템에 전달된 후 필요에 따라 해당 정보를 요청하는 애플리케이션들에게 다시 전송된다. 현재 감시제어시스템에 널리 사용되는 DNP(Distribute Network Protocol)는 취득포인트 정보와 취득값만 가지고 있으므로 포인트 리스트에 대한 정보가 없는 경우에는 취득한 데이터를 판독할 수 없다. 따라서 감시제어시스템을 구축하기 위해 우선 RTU에 감시 선로정보를 입력하고, 이 정보를 다시 감시제어시스템의 DB에 포인트 정보와 매핑을 수행해야만 한다. 또한, 새로운 애플리케이션에서 취득값을 얻기 위해서는 이들 포인트 정보와 매핑 정보를 가지고 있는 감시제어시스템의 DB에 직접 연결해야만 한다. 본 논문은 공통정보모델과 이를 기반으로 작성된 메시지 교환 표준 인터페이스를 이용하여 감시제어시스템 취득정보의 효과적인 교환이 가능한 메시지 통합버스에 대하여 기술한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 D
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• pp.2380-2382
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• 2004

In this paper, Web server is built up using PXA255, 32bit RISC processor with porting Embedded Linux and GoAhead, HTTP(Hyper Text Transfer Protocol) web server, and the system with can monitor and control the environment and condition for AICC(Automatic Intelligent Cruise Control) is realized. For sending the operation condition and change of vehicle the desired data is derived by interacting ECU(Electric Control Unit) and Embedded system and the rpm of engine is controlled by step motor connected to throttle value.

• 전력전자학회논문지
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• 제3권1호
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• pp.1-7
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• 1998

발전설비의 대형화로 인하여 전력절감 문제가 크게 대두되었고, 팬이나 펌프를 부하 변화에 따라 속도제어하므로써 전기 에너지를 절약 할 수 있다. 1MVA급 단위 인버터 2대를 병렬 운전하여 대용량 2MVA GTO 인버터를 구현하였으며, 단위 인버터의 병렬 운전은 2대의 출력변압기 2차측 결선을 직렬 연결하여 구현하였다. 개발된 시스템은 제어반, 정류기반, 2대의 인버터반으로 구성되어 있으며, 이 시스템은 한국전력공사 성인천복합화력발전처 해수펌프 구동 유도전동기(6.6KV 1500KW)에 적용되어 전력절감에 기여하고 있다. 또 단위 인버터가 상호 180$^{\circ}$위상차를 갖도록 병렬 운전하므로써 고조파 성분을 저감시키면서 대용량을 구현하였다.

• 한국산학기술학회논문지
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• 제19권12호
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• pp.887-895
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• 2018

본 논문은 수송량 증대를 위한 열차제어시스템의 안전거리 설계와 전동차 제동설계에 활용할 수 있는 제동모델을 제시한다. 제동모델을 위해 6량 1편성으로 운행되는 전동차의 제동특성을 시험하였다. 제동특성에 영향을 줄 수 있는 인자로는 마찰계수, 제동압력의 변화, 회생제동 등이 있으며 시험을 통해 확인하였다. 제동압력은 상용제동과 비상제동으로 구분하고 차량의 특성을 반영하였다. 주행하는 철도차량에 작용하는 외력은 주행저항을 측정 시험과 후처리 방법을 제시하고 있는 KS R 9217에 따라 시험을 수행하고 2차 다항식 형태로 해당 열차의 주행저항을 제시하였다. 차량의 재원, 마찰계수, 제동압력, 주행저항을 바탕으로 직선 평탄 선로를 주행하는 전동차의 동적 거동은 다물체 동역학 해석 소프트웨어를 이용하여 해석하였다. 해석결과는 상용제동과 비상제동에 대하여 시험결과와 비교 검증하였으며 상당히 합리적인 결과를 도출하였다. 검증된 모델은 제동초기 속도에 따른 정지거리를 분석하고 감속도 중심의 제동모델과 비교하였다. 또한, 운영기관의 마찰계수 한계치에 따라 열차제어시스템을 위한 안전거리는 변화할 수 있음을 확인하였다. 본 연구의 결과는 철도차량들을 연결하여 운행하는 열차의 동적 거동해석에 활용할 수 있을 뿐 아니라 차량 설계에서 제동에 영향을 미치는 다양한 선로환경 분석과 제동 성능향상의 기초자료로 활용할 수 있을 것으로 기대된다.

• 시스템엔지니어링학술지
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• 제3권2호
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• pp.17-24
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• 2007

The HEMU-400X(High-speed Electric Multiple Unit 400km/h eXperiment) project starts in 2007. It is required to control and balance the systems engineering activities throughout the project life cycle for a successful completion of the project. The Systems Engineering Management Plan(SEMP) is the primary, top level technical management document for the integration of all engineering activities within the context of, and as an expansion of, the project plan. A SEMP should be prepared for each project and regularly updated as development progresses. This paper proposes the systems engineering management plan for the HEMU-400X project.

• 대한임베디드공학회논문지
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• 제8권4호
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• pp.213-218
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• 2013

In this research, we report on the development of simulation system for performance verification of BMS(Battery Management System) which is utilized in electric vehicles. In the industrial circles, a manufacturer of BMS typically tests their system with real battery packs. However, it takes a long time to test all functions of BMS. Here, we develop BMU(Battery Managament Unit) as an embedded board, which will be installed in electric vehicle for controlling battery packs. All other environment factors for testing BMU are developed in softwares in order to reduce the term of test. Especially, the proposed system consists of cell simulator and CMU(Cell Management Unit) simulator which simulate real battery cells and control battery cells. These simulators enable the BMU to test more battery cells. In addition, proposed system provides diagnosis program in order to diagnose and monitor the condition of BMS which makes the test of BMS more easily. In order to verify the performance of the developed simulator, we have performed the experiment with real battery packs and our simulator. Through comparing two results of experiments, we verify that developed simulator shows better performance in terms of less amount of testing duration though having high reliability.

• Journal of Electrical Engineering and Technology
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• 제5권4호
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• pp.530-537
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• 2010

By development of renewable energy and more efficient facilities in an increasingly deregulated electricity market, the operation cost of distributed generation (DG) is becoming more competitive. International environmental regulations of the leaking carbon become effective to reinforce global efforts for a low-carbon paradigm. Through increased DG, operators of DG are able to supply electric power to customers who are connected directly to DG as well as loads that are connected to entire network. In this situation, a community energy system (CES) with DGs is a new participant in the energy market. DG's purchase price from the market is different from the DG's sales price to the market due to transmission service charges and other costs. Therefore, CES who owns DGs has to control the produced electric power per hourly period in order to maximize profit. Considering the international environment regulations, CE will be an important element to decide the marginal cost of generators as well as the classified fuel unit cost and unit's efficiency. This paper introduces the optimal operation of CES's DG connected to the distribution network considering CE. The purpose of optimization is to maximize the profit of CES. A Particle Swarm Optimization (PSO) will be used to solve this complicated problem. The optimal operation of DG represented in this paper would guide CES and system operators in determining the decision making criteria.

• Journal of Biosystems Engineering
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• 제14권2호
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• pp.94-103
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• 1989

This study was intended to develop the automatic feeding depth control system of the head-feed combine which could feed the rice head into threshing unit at the optimal depth regardless of plant height and uneven ground surface. In the control system, one-board microcomputer was used for the controller instead of conventional electric circuits. Field test of the combine equipped with the control system was conducted to evaluate its overall performance. It was also investigated how the location and time delay of rice head sensor affect the system performance.