A railway track generates severe levels of vibrations. In order to reduce these vibrations and to provide structural stability, various rail pads, mats, etc., are used for vibration protection. In this study, a specially designed rail pad was developed to reduce vibration and to generate electric power simultaneously, that is, by using the vibrations generated by railway cars on the track. The newly developed rail pads were tested to evaluate the characteristics of electric power by investigating the generated voltage and the current levels and patterns. In addition, we proposed an optimal laminated structure and adhesive by comparing the voltage generated by each type of adhesive required for optimal adhesion of the rail pad and the piezoelectric device.
Power MOSFETs (metal oxide semiconductor field effect transistor) operate as energy control semiconductor switches. In order to reduce energy loss of the device during switch-on state, it is essential to increase its conductance. In this study we have investigated a structure to reduce the on-resistance characteristics of the MOSFET. We have a proposed MOSFET structure of active cells region buried under the gate pad. The measurement are carried out with a EDS to analyze electrical characteristics, and the proposed MOSFET are compared with the conventional MOSFET. The result of proposed MOSFET was 1.68[Ω], showing 10% improvement compared to the conventional MOSFET at 700[V].
Effects of CMP Retaining Ring Material on the Performance of Wafer Polishing Ki-Won Park, Eun-young Kim, Dong-Sam Park Journal of the Korean Society of Manufacturing Process Engineers.2020; 19(3): 22. CrossRef
Effects of Insert Materials of Retaining Ring on Polishing Finish in Oxide CMP Ki-Won Park, Dong-Sam Park Journal of the Korean Society of Manufacturing Process Engineers.2019; 18(8): 44. CrossRef
Finite Element Analysis on Dynamic Viscoelasticity of CMP Polishing Pad Byeongjun Pak, Dasol Lee, Seonho Jeong, Hyunjin Kim, Haedo Jeong Journal of the Korean Society for Precision Engineering.2019; 36(2): 177. CrossRef
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