• Journal of Internet Computing and Services
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• v.16 no.5
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• pp.29-38
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• 2015

The Energy Storage System stores electricity for later use. This system can store electricity from legacy electric power systems or renewable energy systems into a battery device when demand is low. When there is high electricity demand, it uses the electricity previously stored and enables efficient energy usage and stable operation of the electric power system. It increases the energy usage efficiency, stabilizes the power supply system, and increases the utilization of renewable energy. The recent increase in the global interest for efficient energy consumption has increased the need for an energy storage system that can satisfy both the consumers' demand for stable power supply and the suppliers' demand for power demand normalization. In general, an energy storage system consists of a Power Conditioning System, a Battery Management System, a battery cell and peripheral devices. The specifications of the subsystems that form the energy storage system are manufacturer dependent. Since the core component interfaces are not standardized, there are difficulties in forming and operating the energy storage system. In this paper, the design of the profile structure for energy storage system and realization of private profiling system for energy storage system is presented. The profiling system accommodates diverse component settings that are manufacturer dependent and information needed for effective operation. The settings and operation information of various PCSs, BMSs, battery cells, and other peripheral device are analyzed to define profile specification and structure. A profile adapter software that can be applied to energy storage system is designed and implemented. The profiles for energy storage system generated by the profile authoring tool consist of a settings profile and operation profile. Setting profile consists of configuration information for energy device what composes energy saving system. To be more specific, setting profile has three parts of category as information for electric control module, sub system, and interface for communication between electric devices. Operation profile includes information in relation to the method in which controls Energy Storage system. The profiles are based on standard XML specification to accommodate future extensions. The profile system has been verified by applying it to an energy storage system and testing charge and discharge operations.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.1
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• pp.92-99
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• 2009

Deeply-driven ground rod in the rainy season may contact with rainwater and ground water. When surge voltages are applied to the submerged ground rods, the ionization around the ground rods are occurred. Ionization in soil and/or water is affected in dynamic performance of ground rod systems. This work aims at studying the transient performance of ground rod system under impulse voltage using scale model in an electrolytic tank. The potential reduction and energy dispersion caused by ionization were treasured and quantitatively analyzed using the Matlab Program. As a result, the peak voltage at the terminal of ground rod was varied with water resistivity and charging voltage of Marx generator. The potential at the terminal of the ground rod was approximately reduced to a half of the applied voltage just below breakdown voltage. Also the energy more than half of the applied energy was dispersed through the ground rod due to ionization just below breakdown voltage.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.12
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• pp.270-276
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• 2013

We have been unwittingly exposed to magnetic field. Biological effects due to electromagnetic field exposure has been studied over the past several decades. There has been epidemiological studies and laboratory studies. In the case of laboratory studies, the effect has been observed through the cell stimulation of an artificial magnetic field. The used frequency and waveform are various in the cell experiment, but the intensity of the magnetic field is usually around 10G. Intensity of Earth's magnetic field is about 300-400mG. Although this intensity is not much higher than artificial magnetic field as 3-4% amplitude, we can't ignore the effect because every living thing on earth has already adapted for long time ago. In this study, we have designed and implemented the 3-axis magnetic field generation system in oder to remove the static magnetic field in the real-time and kept its intensity less than ${\pm}5mG({\pm}0.5uT)$ using 3-axis helmholtz coil.

• Convergence Security Journal
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• v.19 no.3
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• pp.71-79
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• 2019

The demand of smart cars is increasing rapidly. International stand organize such as 3GPP and 5GAA are proposing standard communication protocvols for connected-car, and automotive network infrastructure. But Smart car network have many security threats and more dangerous against the existed wire communication network. Typically, peripheral devices of a smart car may disguise their identity and steal location information and personal information about the vehicle. In addition, the infrastructure elements around smart cars can conspire and put driving cars in danger, threatening lives. This is a very serious security threat. Therefore, in order to solve these problems, we proposed a system that is secure from collusion and tampering attacks using attribute-based authorize delegation method and threshold encryption algorithms. We have demonstrated using a semantic safety model that the proposed system can be safe from collusion attack.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.65.2-65.2
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• 2010

Currently the variety of governmental business support and research for supplying solar energy have been actively progressed. As of now, however, There are no practical testing infrastructures of grid-connected photovoltaic system which test performance of solar power facility in domestic. Therefore, in KEPRI, there is in progress construction of practical testing ground of 500 kW class grid-connected PV System for developing the evaluation of the performance technology including the Module, PCS, and etc, that is the important instrument of the PV System, in Gochang area. It analyzed the site creation work for constructing the practical testing ground and new construction of control room and the unit standards, specifications and capacity of required equipment. For the system detailed design, configuration, instrument-specific parameters established, power generation predictions of Array Type and the components of testing ground are needed to build.

• Journal of the Korean Academy of Esthetic Dentistry
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• v.13 no.2
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• pp.29-35
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• 2004

최근 심미적인 보철 치료에 대한 사람들의 관심이 높아짐에 따라 자연치와 더욱 조화롭게 보철 치료를 하는 것이 요구되고 있다. 이는 구조적인 심미성과 함께 자연스러운 색조 재현을 통하여 이루어지는데, 자연치의 색조는 매우 다양하고 부위별로 달라질 수 있기 때문에 단순히 shade guide상의 비교만으로는 정확한 색조를 얻기가 어렵다. 이러한 색조 선택의 부정확성 때문에 객관적으로 색조를 분석하는 많은 기계적 장치들이 고안되었고, 최근에 ShadeScan system(CYNOVAD, Canada), Vita Easyshade system(Vident, Canada) 등 디지털로 색조를 평가하는 시스템이 각광을 받고 있다. ShadeScan system은 한 번의 클릭으로 치아 이미지를 채득할 수 있고, 바로 컴퓨터를 통해서 이를 분석하여 원하는 shade map, translucency map 등을 얻을 수 있다. 또한 세 방향에서 조사되는 빛은 자체 calibration을 거쳤기 때문에 주변 광원이나 환경의 영향 없이 객관적으로 치아의 이미지를 채득할 수 있다고 한다. 사실 그 동안 이미지 채득이 객관적이라고 주장하는 많은 system이 있었지만 임상의들은 그 신뢰성에대해 의구심을 보였던 것이 사실이다. 이에 본고에서는 ShadeScan system이 반복 촬영 시 같은 색조재현을 할 수 있는지 실험하여 그 객관성에 대해 살펴보았다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.147-148
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• 1999

대기 화산 모형은 유독 화학 물질이나 방사능 물질 누출 사고시, 방재 대응에 매우 중요한 도구로 사용될 수 있다. 이런 목적을 위해 미국, 유럽 등에서는 1980년을 전후하여 모형 체계 개발에 착수하였고, 현재는 실용화되어 현업에서 운용되고 있다(Lee, et. al, 1997; J. Ehrhardt, 1998). 국내에서는 원자력 안전 기술원을 중심으로 원자력 발전소 주변 반경 십여 km지역에 위치한 기상청의 자동 종합 기상 측정 장치(AWS, Automatic Weather Station)의 실측 바람장을 기반으로 확산 예측을 수행할 수 있는 시스템을 운용하고 있다(원자력안전기술원, 1999).(중략)

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.167-171
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• 2007

텔레매틱스 서비스는 크게 주변 지역 관심 정보, 날씨, 근접 정비소, 현금 자동인출기 등의 정보서비스 분야와 교통정보 서비스, 네비게이션 서비스, 응급서비스, 고장 서비스 및 차량수리 및 차량문제에 관한 진단서비스를 중심으로 서비스가 개발되고 있다. 혹은 두 가지 분야가 복합적으로 개발되고 있다. 또한 텔레매틱스 시장은 여러 가지 기술들이 독립적으로 분할되어 다양한 제품으로 정보를 제공하기 보다는 여러 정보 및 기능 등이 텔레매틱스 시스템으로 집중 및 통합되는 형태가 요구된다. 이에 본 논문에서는 차량 장치 정보를 열람하고 제어하기 위한 단말 미들웨어 모델을 제시/구현하고, 단말 미들웨어를 이용하는 텔레매틱스 서비스 배포를 위한 배포 모델을 제시하고자 한다.

• Journal of the KSME
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• v.35 no.6
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• pp.542-553
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• 1995

복합열병합 발전 플랜트의 장점은 도시 근교에 발전 플랜트를 간단히 건설할 수 있으며, 공해를 크게 줄이면서 독립적인 발전이 가능하다는 측면에서 신도시, 신공업단지, 도서지방 등에서 아주 유리한 것으로 알려져 있다. 또한 가스 터빈 배기열을 이용하여 대규모 주거 지역이나 공업 단 지내에서 필요한 난\ulcorner냉방열이나 공업열원으로의 활용이 손쉬우며, 주변 시설이 복잡하지 않고, 개선된 연소기술에 의하여 공해를 크게 줄일 수 있다. 최근 들어 분당\ulcorner일산\ulcorner부천 지역 등에 열병합 플랜트가 건설되고 있으나 거의 모든 설계기술은 외국 기술에 의존되고 있으며, 국산화 율도 극히 저조하여 '93년도에 완공된 부천 화력(473MW)의 경우 약 30% 정도이다. 복합열병합 발전 시스템은 가스 터빈, 스팀 터빈 등의 터보기계 기술을 근간으로 하며, 열회수장치 및 열교 환장치의 설계기술, 각종 제어기술 등의 종합 설계기술로서 이미 선진국에서는 실용화된지 오 래되었으며 우리 나라에도 여러 종류의 플랜트가 도입되어 사용되고 있다.

• 한국신재생에너지학회:학술대회논문집
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• 2007.11a
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• pp.12-16
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• 2007

A dynamic model of proton exchange membrane fuel cell(PEMFC) system is designed to understand the performance of the PEMFC in residential power generator(RPG) over various balance of plant(BOP) options. In particular, since the performance of PEMFC system should be optimized for given operating ranges, it is necessary to design suitable BDP components which can support the operating ranges. The objective of this study is to develop a dynamic system model for the study of PEMFC performance over various BOP options. Therefore, a dynamic model is composed of a PEMFC stack model, a water management system model, a thermal management system model and a fuel/air supply model and the model is integrated under SIMULINK(R)environment. Basic simulation results will be presented.