Ki-Yong Oh

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Swelling of a commercial 5 Ah lithium-ion cell with a nickel/manganese/cobalt-oxide cathode is investigated as a function of the charge state and the charge/discharge rate. In combination with sensitive displacement measurements, knowledge of the electrode configuration within this prismatic cell's interior allows macroscopic deformations of the casing to(More)
A new inspection robot system is presented for live-line suspension insulator strings to prevent an insulator failure that can have severe effects on national industry, economy and security. This robot system is small-sized, lightweight and more superior in insulation and reliability by adopting a new wheel-leg moving mechanism and a new insulation(More)
The insulators in power transmission lines should be inspected periodically to prevent power failure. By measuring their insulation resistance and distribution voltage with a high resistance resistor at each probe, the developed inspection tool can reliably and safely detect faulty insulators in an insulator string. We confirmed its effectiveness through(More)
Condition monitoring system is pivotal for a wind farm to maximize the availability and economic efficiency of its wind turbines. This paper offers state-of-the-art condition monitoring systems to observe the current status of a wind turbine and to send out embryonic alarm signals before its fault. The developed system is mainly made up of four components:(More)
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