• KEPCO Journal on Electric Power and Energy
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• 제2권1호
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• pp.121-125
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• 2016

KEPCO has completed the installation and demonstration of a 52 MW battery energy storage system (BESS) for frequency regulation. Especially, 24 MW BESS is for Automatic Generation Control (AGC) in Shin-Yongin substation. Recently, KEPCO Research Institute has operated it connected to EMS of KPX. This paper discussed the operation strategy of EMS through a study on using 24 MW BESS in AGC operation and propose the improvement of AGC target. It is expected that this paper helps a safe and reliable operation and control of ESS for AGC through its continuous update.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.344-346
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• 2002

The pneumatic/nydraulic brake system is recently apply to the AGT system such merit as installation is convenient and brake force is strong or than pneumatic brake system. The pneumatic/ hydraulic brake system consist of brake operating unit, electronic control unit, air compressor and pneumatic/hydraulic tranducer. The components of it are controlled and designed to perform the function of brake system. Therefore, This paper design and the pnuematic/hydraulic brake system and propose the derection of development for AGT system.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.421-424
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• 2000

본 논문에서는 ITS(Intelligent Transport System) 서비스를 위한 기반시설로 도입이 예상 되는 DSRC(Dedicated Short Range Communication)시스템에 대하여 시스템의 개요와 특징, DSRC시스템을 이용하여 주차장에서의 요금정산을 자동화하기 위한 시스템의 구조 및 구현방법에 대하여 제안하였다.

• 한국기계연구소 소보
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• 통권17호
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• pp.61-68
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• 1987

The main objective of this paper is to develop the computer-aided vibrational signal processing and monitoring system of rotating machinery. This system has an automatic data acquisition capability and analyze for machine fault diagnosis. By spectrum analysis, machine’s failure can be identified. The monitoring system enables diagnosis of the fault in rotating machinery. In this study, the conventional electrical fans are selected as a model case. The date processing and fault monitoring system proposed here can be applied to the automation of the inspection process in assembling motor-shaft systems. The automatic inspection can enhance the product quality and keep it stable. Since the proposed system is developed for personal computers, it might be cheap in cost and easy in installation.

• 한국주거학회논문집
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• 제13권6호
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• pp.89-99
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• 2002

The purpose of this research is to analyze the characteristics of flow rate distribution in hot-water piping networks in the apartment building. A 14-story apartment house was selected as a sample building and analyzed numerically by Hardy-Cross method. Two different piping networks, one has three vertical zones and the other of a single zone with automatic balancing valves, were compared. Some of research results are as follows; As the temperature of supply hot-water increases, the flow rate of it does by buoyancy effect, but this effect is not found in the piping network with automatic balancing valves. Non-uniformity in hot-water flow distributions to all stories in the piping system of single vertical zone can be completely reformed by the installation of either manually operated or automatic balancing valves in every story.

• 한국ITS학회 논문지
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• 제11권6호
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• pp.23-30
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• 2012

본 연구에서는 수도권을 중심으로 구축 운영 중에 있는 ITS 무선통신 인프라인 UTIS 서비스 지역을 확대하는 방안으로 전국에 약 5,000여대가 설치되어 있는 무인단속장비와 UTIS 기지국을 통합하는 방안을 제시하였다. 기존의 UTIS는 25m 높이에 기지국이 설치되고 광통신망을 통해 센터와 통신하는 반면, 무인단속장비는 6.6m 높이에 설치되어 임대 통신망을 통해 센터와 통신하는 등의 차이가 있다. 무인단속장비와 UTIS 기지국의 효율적인 통합방안을 제시하기 위해서 현황분석을 통해 1,628개소의 통합설치 개소를 선정하였고, 현장시험을 통해서 6.6m의 높이에서도 UTIS 요구성능을 만족하는 것을 확인하였다. 또한 통합에 적합한 통신망 및 시스템 구성방안을 제시하였으며, 통합 설치 시 비용 절감효과를 분석하여 현장시스템 구축 비용이 UTIS 기지국 단독 설치 시에 비해 약 1/5 수준으로 절감됨을 확인하였다.

• 한국토양비료학회지
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• 제45권6호
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• pp.1179-1186
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• 2012

For better understanding of carbon cycle dynamics of an agro-ecosystem, an accurate assessment of seasonal and daily $CO_2$ flux is essential to understand the relationship between various environmental factors and crop productivity. We developed the automatic sliding canopy chamber (ASCC) system that measured continuous net ecosystem productivity (NEP) over whole growing season under the natural meteorological rhythm. The ASCC was composed of two main parts which were sliding part for measuring NEP, and automatic opening and closing chamber (AOCC) for measuring soil respiration (SR) on the soil surface. The ASCC was developed by using open flow method for measuring soil $CO_2$ efflux. The disturbance of natural meteorological condition was minimized by opening the base frames. In the field test with barley (Hordeum vulgare L.), NEP was calculated at $140mg\;CO_2\;m^{-2}h^{-1}$ on a clear day using continuous data and eliminated the possibility of overestimate about 16% using one hour data during the day time. Unlike other small scale chamber system, installation on cropping-field made it possible to take any modifications which might be caused by natural environmental condition.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 춘계학술대회 논문집
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• pp.187-192
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• 2007

The terminal voltage of a synchronous generator is maintained by the field current control of excitation system Generally AC/DC converter which is component of AVR(Automatic Voltage Regulator) system for excitation current control is connected to diode rectifier and DC/DC converter system In the case of diode rectifier system of phase controlled converter, AC/DC converter has low power factor and some low order harmonics in the line current. In this paper, two-stage three-phase PWM AC/DC converter is studied to solve these problems, The proposed method is verified by the computer simulations and experimental results in prototype generation system.

• 조명전기설비학회논문지
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• 제28권11호
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• pp.33-41
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• 2014

This paper is research result for a development of sapphire silicon ingot glowing(SSIG) PWM converter system for 80kW 10kA. The system include 3-phase AC-DC diode rectifier of input voltage AC 380V and 60Hz, DC-AC single phase full bridge PWM inverter of high frequency, AC-DC single-phase full wave rectifier using center-tapped of transformer for low voltage 8.0V and large current 10,000A of output specification, tungsten resistor load 0.1[$m{\Omega}$]. PWM switching frequency for IGBT inverter control set 30kHz. The suggested researching contents are designed data sheets of power converter system, PSIM simulation, operating characteristics and analysis results of developed SSIG system. This paper propose

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 추계학술대회
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• pp.929-932
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• 2013

선박안전법과 어선법 개정에 따른 어선의 VHF(Very High Frequency) 무선설비와 위치자동발신장치 설치 의무화에 대비하여 수협중앙회 어업정보통신국에서는 VHF통신망과 어선관제를 위한 위치자동발신장치 시스템을 구축하고 있다. 본 연구에서는 DSC(Digital Selective Calling) 기능을 이용한 위치요청 호출의 프로토콜 분석과 선박위치추적에 대한 최적의 방안을 제시한다. 또한 이를 바탕으로 어선관제시스템 구현과 모니터링 방법에 대한 기술을 제시한다.