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Jeongtae Kim,Meejung Ahn,Yuna Choi,Poornima Ekanayake,Gi‑Ok Kim,Taekyun Shin 경희대학교 융합한의과학연구소 2020 Oriental Pharmacy and Experimental Medicine Vol.20 No.1
We evaluated the antifibrotic effects of fermented black radish (FBR) on carbon tetrachloride (CCl4)-induced chronic liver injury in rats. Serum biochemical analysis indicated that FBR treatment attenuated the upregulation of alanine aminotransferase and aspartate aminotransferase. Moreover, Sirius red staining and histopathological examination revealed decreased fibrosis and inflammation in FBR-treated rats compared with CCl4 + vehicle-treated rats. Western blot analysis of alpha-smooth muscle actin expression levels confirmed the downregulation of fibrosis in the FBR treatment group compared with the CCl4 + vehicle treatment group. These results suggest that FBR treatment suppressed liver fibrosis in CCl4-exposed rats.
Development of a PLD heater for continuous deposition and growth of superconducting layer
Jeongtae Kim,Insung Park,Gwantae Kim,Taekyu Kim,Hongsoo Ha 한국초전도저온학회 2023 한국초전도저온공학회논문지 Vol.25 No.2
Superconducting layers deposited on the metal substrate using the pulsed laser deposition process (PLD) play a crucial role inexploring new applications of superconducting wires and enhancing the performance of superconducting devices. In order toimprove the superconducting property and increase the throughput of superconducting wire fabricated by pulsed laser deposition,high temperature heating device is needed that provides high temperature stability and strong durability in high oxygen partialpressure environments while minimizing performance degradation caused by surface contamination. In this study, new heating device have been developed for PLD process that deposit and growth the superconducting materialcontinuously on substrate using reel-to-reel transportation apparatus. New heating device is designed and fabricated using iron-chromium-aluminum wire and alumina tube as a heating element and sheath materials, respectively. Heating temperature of theheater was reached over 850 ℃ under 700 mTorr of oxygen partial pressure and is kept for 5 hours. The experimental resultsconfirm the effectiveness of the developed heating device system in maintaining a stable and consistent temperature in PLD. Theseresearch findings make significant contributions to the exploration of new applications for superconducting materials and theenhancement of superconducting device performance.
Lifetime Assessment for Oil-Paper Insulation using Thermal and Electrical Multiple Degradation
Jeongtae Kim,Woobin Kim,Hung-Sok Park,Ji-Won Kang 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
In this paper, in order to investigate the lifetime of oil-paper insulation, specimens were artificially aged with thermal and electrical multiple stresses. Accelerated ageing factors and equivalent operating years for each aging temperatures were derived from results of tensile strengths for the aged paper specimens. Also, the evaluation for the multi-stress aged specimens were carried out through the measurement of impulse breakdown voltage at high temperature of 85℃. The lifetimes of the oil-paper insulations were calculated with the value of 66.7 for 1.0 mm thickness specimens and 69.7 for 1.25 mm thickness specimens throughout the analysis of impulse BD voltages using equivalent operating years, which means that dielectric strengths would not be severely decreased until the mechanical lifetime limit. Therefore, for the lifetime evaluation of the oil-paper insulation, thermal aging would be considered as a dominant factor whereas electrical degradation would be less effective.
Jeongtae Kim,Dong-Uk Kim,Youngjo Lee,Jayoon Koo 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.6
In order to find out partial discharge (PD) phenomena in the cable joint due to the poor workmanship during the installation, the relationship between PD inception voltages and joint defects was investigated. For the purpose, in the joint of 22.9kV CNCV cables, electric fields were calculated for various semiconductive layer wrong positioning (WP) defects. And, PDIV were investigated through the experiments and compared with the results of electric field analysis. In all WP defect cases, the PD inception field calculated using measured PDIVs was similarly shown to be the average value of 1.84kV/mm. In addition, the calculated PDIV and the measured PDIV were almost equal, from the PDIV calculation using maximum electric fields and the measured PDIV for the normal case. Throughout this study, it is possible to analyze WP defects due to the poor workmanship and to establish better joint design for the distribution grade extruded cable system.