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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.
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.
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.
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.
저탄소 녹색성장이라는 정부의 강력한 지원정책 중 하나인 전기자동차 활성화 방안 발표 이후 서울시에서는 2010년 4월부터 전기자동차의 시내주행을 허용하고 2011년으로 예정된 완성차 업계의 전기자동차 양산예정에 맞춰 전기자동차 충전인프라 구축이 절실히 필요한 실정이다. 이에 도시철도에서는 전기차의 급속충전에 사용예정인 DC전력이 이미 구축되어 전력인프라를 쉽게 활용할 수 있고, 서울시 및 수도권에서 운영중인 많은 역사를 쉽게 이용할 수 있는 유리한 점이 있어 전기차 충전시스템 개발이 용이하다. 본 논문에서는 전기차를 충전하는 과정을 시연 및 홍보하고자 도시철도 전력망을 이용하여 연구개발하고 있는 전기차 충전장치중 교류용 전기차 충전장치를 수서역 공영주차장에 현장설치되는 시스템에 대하여 기술하였다.
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.
EMC (Electro Magnetic Compatibility) of the electrical railway must be ensured for safety of passenger. Maglev trains has not friction between the wheels and the rails because levitation by an permanent magnets, electromagnets and superconducting magnets etc. So, it is advantageous to maintain a high speed without noise and vibrations. In this paper, we investigated that the magnetic field of the before and after installation electromagnetic waves absorber in order to analyze the effects of electromagnetic waves. The theoretical analysis of the electromagnetic wave absorber was simulated using finite element method. The magnetic field properties of electromagnetic waves absorber were measured by EMI (Electro Magnetic Interference) test receiver.