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보의 크기와 전단철근간격비에 따른 고강도 철근콘크리트보의 전단강도 특성 연구
유인근(Yu, In-Geun),박나정(Park, Na-Jeong),백승민(Baek, Seung-Min),김우석(Kim, Woo-Suk),곽윤근(Kwak, Yoon-Keun) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.9
This study conducted an experiment on the shear strength of high-strength reinforced concrete beams depending on the effects of shear reinforcement spacing and beam size. Through experiments, experimental values were compared with the theoretical values based on standard equations such as KDS 14 20 22, ACI 318-19, CEB-FIP, and existing proposal equations which are Zsutty, Bazant, and Lee’s equations. It will be compared and analyzed to be used as basic data for shear design of reinforced concrete beams with fck = 50 ㎫, ρ = 0.025 and the width-to-depth ratio (h/b) were constant, and the beam size (b×d) and shear reinforcement spacing (d/s) were variables. The test specimens were divided into three series, SHR1, SHR2, and SHR3, according to the size of the cross section. As a result of comparing the experimental value and the theoretical value according to the standard equations and the proposed equations, the average value was 1.15 to 1.61 and the standard deviation was 0.16 to 0.20. Among the comparisons between the standard and proposed equations, the Zsutty, Bazant, and Lee’s equations predict experimental values relatively well. The mean of the Zsutty’s equation was 1.29, the standard deviation was 0.18, the mean of the Bazant’s equation was 1.15, the standard deviation was 0.19, the mean of the Lee’s equation was 1.17, and the standard deviation was 0.20, respectively.
이동한(Dong-han Lee),이석주(Sukju Lee),김종현(Jonghyun Kim),박민원(Min-won Park),유인근(In-Keun Yu) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
In this paper an integrated model of PV-AF (Photovoltaic-Active Filter) and PV-SPE (Photovoltaic Solid Polymer Electrolyte) system using PSCAD/EMTDC were explained in detail. The main concept of PV-AF system starts from the "harmonics". In order to deliver power to utility, PV system essentially needs a converter system. Here PV-AF system adds the function of active filter to the converter system installed in PV system, which was introduced already in several papers. PV-SPE system has been studied as a replacement of existing hydrogen production technology that emits large amount of carbon dioxide into atmosphere. Until now, these two systems, PV-AF and PV-SPE, have been considered separately. However, in this paper, characteristics and advantages of combined system are discussed in detail.
PSCAD/EMTDC를 이용한 PV-AF-SPE 시스템의 특성분석
이동한(Donghan Lee),이석주(Sukju Lee),김종현(Jonghyun Kim),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this paper an integrated model of PV-AF (Photovoltaic-Active Filter) and PV-SPE (Photovoltaic Solid Polymer Electrolyte) system using PSCAD/EMTDC were explained in detail. The main concept of PV-AF system starts from the "harmonics". In order to deliver power to utility, PV system essentially needs a converter system. Here PV - AF system adds the function of active filter to the converter system installed in PV system, which was introduced already in several papers. PV-SPE system has been studied as a replacement of existing hydrogen production technology that emits large amount of carbon dioxide into atmosphere. Until now, these two systems, PV-AF and PV-SPE, have been considered separately. However, in this paper, characteristics and advantages of combined system are discussed in detail.
PV-SPE 시스템을 위한 새로운 MPPT 제어의 운전특성 분석에 관한 연구
최종호(Choi, Jong-Ho),이동한(Lee, Dong-Han),김종현(Kim, Jong-Hyun),김재호(Kim, Jae-Ho),박민원(Park, Min-Won),유인근(Yu, In-Keun) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
In the newly developed control method, the current flowing into SPE cell is the only one considerable factor. So, the structure of control circuit becomes simple and the manufacturing cost of the control device decreases. In conventional power comparison MPPT control method however, a voltage and current coming out from PV cell should be feedbacked to chase maximum power point at every moment. Then, the structure of control circuit becomes so complex and the risk of control failure is much higher than the novel MPPT control method. Therefore, PV generation system by a novel MPPT control method is especially operated much more safely in case of a huge system, because the voltage coming out from PV-cell is not needed to be feedbacked. In this paper, the PV-SPR system was actually manufactured based on the simulation model of PSCAD/EMTDC program and the results tested were shown. Authors are sure that it is the most useful method to maximize power from PV to SPE with only a feedback of SPE input current.
Industrial load forecasting using the fuzzy clustering and wavelet transform analysis
유인근,Yu, In-Keun Institute of Korean Electrical and Electronics Eng 2000 전기전자학회논문지 Vol.4 No.2
This paper presents fuzzy clustering and wavelet transform analysis based technique for the industrial hourly load forecasting fur the purpose of peak demand control. Firstly, one year of historical load data were sorted and clustered into several groups using fuzzy clustering and then wavelet transform is adopted using the Biorthogonal mother wavelet in order to forecast the peak load of one hour ahead. The 5-level decomposition of the daily industrial load curve is implemented to consider the weather sensitive component of loads effectively. The wavelet coefficients associated with certain frequency and time localization is adjusted using the conventional multiple regression method and the components are reconstructed to predict the final loads through a five-scale synthesis technique. The outcome of the study clearly indicates that the proposed composite model of fuzzy clustering and wavelet transform approach can be used as an attractive and effective means for the industrial hourly peak load forecasting.