Chan Ho Yang

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In this study, we have investigated the feasibility of applying piezoelectricity to convert the mechanical vibrations of an operating commercial high-speed Korean train to useful electricity. We recorded and analyzed the vibrations of Korea Train eXpress (KTX). We experimented with different cantilever beam thicknesses (0.25, 0.6, and 1.0 mm) and different(More)
Many researches on developing new energy sources are being actively conducted recently. These new energy sources include renewable energy sources such as solar, wind, rain or wave energy and harvesting energy especially from human activities. In this research, we developed an energy harvester using human footsteps among various sources of energy. This(More)
As the importance of climate change is rising up, there is an attempt to harvest unused energy to reuse it in a form of electricity, which is called energy harvesting. It has a possibility to be applied to a macro-power source such as a road energy harvesting. We have designed a new road energy harvester, in which all the cantilever beams share a single tip(More)
A novel piezoelectric energy harvesting module with controllable strain was designed to allow investigations into the correlations among strain, frequency, and output power. Specifically, although conventional vibration modules allow control over strain only through variation in tip mass, the proposed module allows more accurate strain control through(More)
Many researches with regard to piezoelectric energy harvesting from pressure exerted by passing cars have been conducted. In this paper, an impact-based road energy harvester as buried-type is developed with the method that the piezoelectric device is deformed directly by the pressure due to passing cars. Based on this, the developed road energy harvester(More)
We designed a piezoelectric energy harvesting system that can shift the resonant frequency to match the fixed external energy frequency. A permanent magnet (10 &#x00D7; 10 &#x00D7; 5 mm<sup>3</sup>) was attached to the free end of a cantilever beam, and a permanent magnet was attached to each of the four faces of a rotor at 90&#x00B0; angles. The effect of(More)
This study investigated the effects of strain and crack formation on the performance of piezoelectric materials as well as methods to repair damaged electrodes and reinforce the piezoelectric material. Specifically, this study investigated whether Ag paste (thickness: 0.1 mm) could restore electrical contact in damaged electrodes, and whether a coating of(More)
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