Gwiy-Sang Chung

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This paper describes the design, fabrication and characteristics of a micromachined piezoelectric valve utilizing a multilayer ceramic actuator (MCA). The micromachined MCA valve, which uses a buckling effect, consists of three separate structures: the MCA, the valve actuator die and the seat die. The valve seat die with six trenches was made, and the(More)
In this paper, a tunable microstrip patch antenna designed using RF MEMS switches is reported. The design and simulation antenna were performed using high frequency structure simulator (HFSS). The antenna was designed in ISM Band and operates simultaneously at 2.4 Ghz and 5.7 Ghz with a -10 dB return-loss bandwidth of 20 Mhz and 180 Mhz, respecttively. To(More)
A resistivity-type hydrogen (H2) sensor based on palladium (Pd)-decorated zinc oxide (ZnO) nanorod (NR) array has been developed to detect the dissolved H2 gas in the transformer oil. The Pd catalyst decorated on the ZnO NRs not only enhanced the H2 sensing properties at room temperature, but also played an important role to protect the ZnO NRs in liquid(More)
Herein we report an enhanced triboelectric nanogenerator (TENG) based on the contact-separation mode between a patterned film of polydimethylsiloxane (PDMS) with a semimetallic elastomer of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and a nylon fiber film. The addition of ethylene glycol to the PEDOT:PSS film improves the(More)
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