• Journal of Korean Society of Disaster and Security
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• v.14 no.2
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• pp.35-42
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• 2021

In order to produce electric vehicle demand forecasting information, which is an important element of the plan to expand charging facilities for electric vehicles, a model for predicting electric vehicle demand was proposed using Exponential Smoothing. In order to establish input data for the model, the monthly power demand of cities and counties was applied as independent variables, monthly electric vehicle charging stations, monthly electric vehicle charging stations, and monthly electric vehicle registration data. To verify the accuracy of the electric vehicle power demand prediction model, we compare the results of the statistical methods Exponential Smoothing (ETS) and ARIMA models with error rates of 12% and 21%, confirming that the ETS presented in this paper is 9% more accurate as electric vehicle power demand prediction models. It is expected that it will be used in terms of operation and management from planning to install charging stations for electric vehicles using this model in the future.

• JOURNAL OF ELECTRICAL WORLD
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• s.408
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• pp.69-76
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• 2010

'Smart Grid 선도 기업', '국내 최고의 전력 자동화 기업' 등이 최근 LS산전을 인식하는 대표적인 상징어로 각인되고 있다. 이 가운데 스마트 그리드 분야의 선도 이미지는 LS산전이 지난 10여 년간 투자해온 전력IT 분야의 결실로 평가되고 있다. 1974년 설립된 LS산전(대표 구자균)은 과거의 생존게임을 탈피, 대단위 투자를 통한 그린 비지니스 전략 및 비전을 구체화 하고 있다. 국가적 차원의 아젠더로 추진되면서 일상생활의 패러다임을 변화시킬 원천기술인 스마트 그리드와 HVDC, 전력선 통신, 연료전지 등의 상용화 기술개발에도 박차를 가하고 있다. 품질경영과 혁신활동을 중시하면서도 창조적이고 역동적인 소통의 기업문화를 자랑하는 LS산전의 미래성장을 위한 글로벌 열정은 여전히 진행 중이다.

• JOURNAL OF ELECTRICAL WORLD
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• s.346
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• pp.64-72
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• 2005

에너지산업 해외진출 활성화 및 에너지 수급시스템 혁신으로 高유가 극복/ 한전, 공기업 최초 『중소기업 기술상담 센터』개소/ 한전, 국내기업 최초로 해외 CDM사업 진출/ 한국중부발전(주), 중소기업 정보화지원(ERP) 협약체결/ 한국동서발전(주), 발전회사 최초 부부과장 탄생/ 한국남부발전-(주)에코아이, 풍력발전 CDM 추진을 위한 MOU체결/ 한국남동발전, 2005년 호주 세계석탄회의 한국대표로 주제 발표/ 두산중공업, 국산 원전설비 美 수출/ 효성, 「2005 프리뷰 인 서울(PIS)」참가/ 한전KDN, 전력 IT 중기 R&D지원/ 현대중공업(주), 「2005 에너지전」에 참가/ 한국종합에너지, 포스코파워로 회사명 변경/ '고유가 뚫어라' 모토시리즈-미국국가에너지정책에서 배운다/

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.509-512
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• 2018

최근 미세먼지에 대한 관심이 높아지고 있으며, 미세먼지를 줄이기 위한 다양한 기술이 연구되고 있다. 본 연구에서는 기존 가솔린 이륜차의 단점을 극복하고 미세먼지 발생을 줄일 수 있는 배터리 교환식 이륜차 및 IoT 기반 지원시스템을 소개한다. 전기 이륜차에 탑재되는 IoT Edge device에서는 배터리 잔량, 배터리 ID, 위치 정보 등의 정보를 LTE-M 통신을 통해 IoT 클라우드에 전송하고, 배터리 교환이 필요한 경우 주변의 배터리 교환기 위치 및 교환 가능한 배터리 정보 전달 받을 수 있다. 현재 전기이륜차에 탑재될 IoT Edge device 및 사용자용 스마트폰앱을 개발하고 있으며, 배터리 교환기 및 클라우드 서비스 개발도 수행될 예정이다.

• Tunnel and Underground Space
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• v.13 no.4
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• pp.279-286
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• 2003

Many trials to set up the correlation between the rock mass classification and the earth resistivity have been carried out to design tunnel support type based on the interpreted electrical resistivity acquired by surface electrical survey. But it is hard to find reports on the comparison of the real rock support type determined during the excavation with the electrical resistivity by the inversion of the survey data acquired before the tunneling. In this study, the rock mass classification based on the face mapping data and the resistivity inversion data are investigated to see if it is possible to design reliably the rock support type based on the surface electrical survey. To get the quantitative correlation, rock engineering indices such as RCR(rock condition rating), N(Rock mass number), Q-system and RMR(rock mass rating) are calculated. Since resistivity data has low resolution, Kriging method as a post processing technique which minimizes the estimated variance is used to improve resolution. The result of correlation analysis shows that the 2D electrical resistivity survey is appropriate to see the general trend of the geology in the sense of rock type, though there might be some local area where these two factors do not coincide. But the correlation between the result of 3D survey and the rock mass classification turns out to be very high, and then 3D electrical resistivity survey can make it possible to set up more reliable rock support type.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.53 no.9
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• pp.576-583
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• 2004

This paper presents a buck circuit topology of high-frequency with a single switching device. It solved the problem which arised from hard-switching in high-frequency using a resonant snubber and operating under the principle of ZCS turn-on and ZVS turn-off commutation schemes. In the existing circuit, it has the voltage stress that is almost twice of input voltage in a free-wheeling diode. In the proposed circuit, it has the voltage stress that is lower than input voltage with modifing a location of free -wheeling diode. In this paper, it expained the circuit operation of each mode and analyzed feedback-loop stabilization. Also it confirmed the waveform of each mode with simulation result. The experiment result verified the simulation waveform and compared the voltage stress of a free -wheeling diode in the exsiting circuit with the voltage stress of that in the proposed circuit. Moreover, it compares and analyzes the proposed circuit's efficiency with the hard-switching circuit's efficiency according to the change of load current.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.11a
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• pp.27-30
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• 2003

Recently, on power system, it is used to high voltage of transmission and distribution due to safe power supply and have high quality and insulation in order to satisfy excellent insulator. Thus, according to underground of high voltage cable, is occurred break down by ground short. Therefore, it is used to high quality XLPE power cable to interrupt instantaneous voltage drop. If it appear inner defect for cable whose have high quality and insulation, it is reduced rapidly due to concentration of electrical field. After assemble to manufacture, in order to inspect cable condition, it is decided much inspection standard. In this paper, In inner defect of assembling cable at manufacture, for measure the variation of insulation condition by void. it tested the variation of insulating characteristics, using $\phi$-q-n distribution variation in partial discharge experiment.

• Proceedings of the KIEE Conference
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• 1986.07a
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• pp.89-92
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• 1986

• JOURNAL OF ELECTRICAL WORLD
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• no.3 s.8
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• pp.18-22
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• 1976

This essay will introduce that how the Korean and Japanese numerals have been developed from the same ancient original words. It would be a big interest for many people who have interested in knowing the origin of Japanese language of which many Japanese

• 전기의세계
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• v.17 no.1
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• pp.48-50
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• 1968

The convergence rate of Bayes' learning process is investigated for a binomial random variable. A measure of the rate of convergence is proposed and it is found that such a measure can be approximated by an exponential function of the number of observations.