Yun Ji Kim

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Achieving a low contact resistance for 2D materials is a critical challenge for device applications. In this work, the contact resistance of MoS<sub>2</sub> FETs has been drastically reduced by five times from the reference data using an optimized TiO<sub>2</sub> Fermi level de-pinning layer which reduced the effective Schottky barrier height to 0.1 eV. As(More)
The operation of chemical vapor-deposited (CVD) graphene field-effect transistors (GFETs) is highly sensitive to environmental factors such as the substrate, polymer residues, ambient condition, and other species adsorbed on the graphene surface due to their high defect density. As a result, CVD GFETs often exhibit a large hysteresis and time-dependent(More)
AIMS Heat shock protein 70 (HSP70), one of the major HSPs, has been reported to suppress apoptosis and formation of pathogenic proteins in neurodegenerative disorders. Geranylgeranylacetone (GGA), an anti-ulcer drug, induces HSP70 and thereby protects against cellular damage in various diseases. We investigated the effect of GGA on hydrogen peroxide(More)
The abuse of alkyl nitrites is common among adolescents and young adults worldwide. However, the information regarding the effects of alkyl nitrites on the central nervous system and the associated psychological abuse potential is scarce. The abuse potential of 3 representative alkyl nitrites - isobutyl nitrite, isoamyl nitrite, and butyl nitrite - was(More)
Novel electrical measurement method, discharge current analysis (DCA), is introduced to extract the density and energy distribution of charge traps at the dielectric interface of top-gate graphene field-effect transistors. Using DCA method, the highest charge trap density ~10<sup>13</sup> (cm<sup>-2</sup> &#x00B7; eV<sup>-1</sup>) is extracted at Fermi(More)
This study proposes a design of a ternary logic inverter using graphene barristor (GB). To design a multiple-valued logic gate, controlling threshold voltages of the unit device should be easy. We determined that the doping concentration of the graphene can easily control the operation voltage of the GB. To realize an ideal ternary logic gate, the concept(More)
Alkyl nitrites have been problematic worldwide due to their recreational use. Although there is a lack of scientific information on their action on the central nervous system (CNS), many anecdotal reports and case studies have inferred the CNS actions of alkyl nitrites. The objective of this study was to investigate the effects of alkyl nitrites on the CNS,(More)
Strong demand for power reduction in state-of-the-art semiconductor devices calls for novel devices and architectures. Since ternary logic architecture can perform the same function as binary logic architecture with a much lower device density and higher information density, a switch device suitable for the ternary logic has been pursued for several(More)
Galactosemia is caused by defects in the galactose metabolic pathway, which consists of three enzymes, including UDP-galactose-4-epimerase (GALE). We previously reported nine mutations in Korean patients with epimerase-deficiency galactosemia. In order to determine the functional consequences of these mutations, we expressed wild-type and mutant GALE(More)
Air in the main pancreatic duct has been reported only rarely and might be associated with either a spontaneous or a surgically induced alteration of the anatomy of the biliary tract. We report a case of "innocent" air found incidentally in the main pancreatic duct. To our knowledge, this is only the third such case reported. A 54-year-old woman presented(More)