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전기차 충전시스템을 위한 도시철도 DC 전력의 활용방안 연구
강현일(Kang Hyun-il),김윤식(Kim Youn-sik),심재석(Sim Jae-suk),임형길(Im Hyeong-gil),유기선(Ryu Ki-seon),이기승(Lee Gi-seung) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Electric vehicles have reached a new level of development with introductions by Chrysler, Ford, Honda and Toyota. Today's charging technology includes conductive and inductive charging systems. There are three standardized charging levels: Level 1: charging can be done from a standard, grounded AC 120V, 3-prong outlet available in all homes Level 2: charging is at AC 240V, 40 amp charging station with special consumer features to make it easy and convenient to plug in and charge EVs at home or at an EV charging station Level 3: a high-powered charging "fast charge" technology currently under development that will provide a charge in less than 15 minutes. The incoming AC power is converted to DC and stored in the vehicle's batteries. In this paper, we investigated the application of urban railway DC electric power for electric car charging system.
몰드변압기를 위한 부분방전 실시간 감시시스템 현장 측정
강현일(Kang Hyun-Il),임형길(Im Hyeong-Gil),유기선(Ryu Ki-Seon),이기승(Lee Gi-Seung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Typically, in a partial discharge detecting device for a molded transformer with tap terminals of a no-load switching type on the high voltage winding, the output signal of a partial discharge detecting sensor connected between the tap terminals is applied through an amplifier circuit to an indicator. The sensor is arranged on the high potential side whose potential corresponds to the potential to ground of the tap terminals. The simulation results show the proposed approach may achieve a quite satisfactory recognition of partial discharge patterns.
Ru/RuO<sub>2</sub>전극에 성장한 PZT 박막의 특성에 관한 연구
강현일,최장현,박영,송준태,Kang, Hyun-Il,Choi, Jang-Hyun,Park, Young,Song, Joon-Tae 한국전기전자재료학회 2002 전기전자재료학회논문지 Vol.15 No.10
The structural and electrical properties of PZT (lead zirconate titante) thin films grown on Pt (platinum) and Ru/Ru $O_2$(ruthenium/ruthenium oxide) electrodes were investigated. Thin films of PZT were deposited on a variety of electrodes using the rf-magnetron sputtering process. PZT films exhibited polycrystalline structure with strong PZT (100) plane and weak (211) plane for an optimizied Pt electrode and (100), (101), (111), (200), (210), (211) planes for Ru/Ru $O_2$. Switching polarization versus fatigue characteristic of Pt/Ti electrodes showed 20% degradation up to 1 $\times$ 10$_{9}$ cycles. No significant fatigue was observed in the films on Ru/Ru $O_2$ electrodes up to Ix109 test cycles. The results show that the new Ru/Ru $O_2$ bottom electrodes are expected to reduce the degradation of ferroelectric fatigue.
강현일(Kang Hyun-Il),이기승(Lee Gi-Seung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
In this paper, we present the piezoelectric generator for railroad application. Piezoelectric materials, usually crystals or ceramics, have the capability to generate a small amount of current, when they are subjected to mechanical pressure, such as pushing, bending, twisting, and turning. Recently, East Japan Railway Company (JR East) installed piezoelectric elements in the floors at ticket gates and other areas of Tokyo Station to test a system that generates power using the energy created by passengers passing through the gates. The amount of electricity it puts out was directly dependent on the number of people walking over it. Significantly higher power levels are expected from larger scale testing in Israel (Innowattech Company), where piezoelectric material is embedded under active walking street, road and airport as also railroad. Thus, the electric energy is generated from human or vehicle traffic and will use for e.g. road lightning.
직류용 FRP 폴리머 장간애자의 전기적 특성에 관한 연구
강현일(Kang Hyun-il),김윤식(Kim Youn-sik),심재석(Sim Jae-suk),이기승(Lee Gi-seung) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Fiber Reinforced Plastic (FRP) insulators for direct current (DC) were developed and their electrical characteristics were investigated. Electrical tests were carried out to measure withstanding and flashover voltages under common use frequency condition. Tensile and bending tests were performed for the mechanical characteristics. The test results showed that DC FRP insulators had superior voltage resistances and strengths to porcelain insulators.
Rf-sputtering법으로 증착한 PZT박막의 타겟의 Pb 함량에 따른 전기적 특성에 관한 연구
이규일,강현일,박영,박기엽,송준태,Lee, Kyu-Il,Kang, Hyun-Il,Park, Young,Park, Ki-Yub,Song, Joon-Tae 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.3
The role of excess Pb about the crystallization behavior and electrical properties in b(Zr$\sub$0.52/Ti$\sub$0.48/)O3(PZT) thin films has not been precisely defined. In this work, the effect of excess Pb content on the ferroelectric properties of these films was investigated. To analyze the effect, PZT films containing various amounts of excess Pb were Prepared. PZT thin films were deposited on the Pt/Ti bottom electrode by rf magnetron sputtering method and then they were crystallized by rapid thermal annealing (RTA). The experiment showed that all PZT films indicated perovskite polycrystalline structure with preferred orientation (111) and no pyrochlore phase was observed. As higher excess Pb was included, the films showed that value of leakage current shift from 2.03${\times}$10$\^$-6/ to 6.63 ${\times}$ 10$\^$-8/A/cm$^2$ at 100kV/cm, and value of remanent polarization shift from 8.587 ${\mu}$C /cm$^2$ to 4.256 ${\mu}$C/ cm$^2$. Electrical properties of PZT thin film affected by Pb excess content of target were explained to be caused of defect among space charges and defect grain boundaries.
루테늄 전극위에 증착된 PZT 박막의 전기적 및 강유전 특성
황현석(Hyun Suk Hwang),유영식(Yougn Sik Yu),임윤식(Yun-Sik Lim),강현일(Hyun-il Kang) 대한전기학회 2014 전기학회논문지 P Vol.63 No.1
Pb(Zr0.52Ti0.48)O₃(PZT) thin films deposited on Ru/RuO₂ bottom electrode that grown for in-situ progress used rf magnetron sputtering method. We investigated the dependence of the crystalline and electrical properties in the way of capacitors PZT thin films. Our results show that all PZT films indicated polycrystalline perovskite structure with preferred orientation (110) and no pyrochlore phase is observed. The electric properties of the Ru improved with increasing Ru thin films thickness. A well-fabricated Ru/PZT/Ru (100 nm) /RuO₂ capacitor showed a leakage current density in the order of 2.03×10<SUP>-7</SUP> A/cm<SUP>2</SUP> as a 50 kV/cm, a remnant polarization (Pr) of 9.22 μC/cm², and a coercive field (-EC) of -32.22 kV/cm. The results show that Ru/Ru/RuO₂ bottom electrodes are expected to reduce the degradation ferroelectric fatigue and excellent ferroelectric properties.