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Liquid Silicone Rubber/Nano Silicon Carbide함량에 따른 나노콤포지트의 열전도와 부분방전 저항성 특성에 관한 연구
남진우(Jin-Woo Nam),임재현(Jae-Hyeon Lim),손민호(Min-Ho Son),함재진(Jae-Jin Ham),강정현(Jung-Hyeon Kang),유주열(Joo-Yeol Ryu),이보인(Lee Bo In),박재준(Jae-Jun Park),박익준(Park Ik Jun) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7
Nano Silicon Carbide was modified with a vinyl group to strengthen the dispersibility and the bonding of the chemical interface between the silicon resin and the SiC surface. The modified nano SiC was charged and dispersed as 0, 1, 3, 5, 7, 9 wt%, and samples were prepared to evaluate partial discharge resistance, thermal conductivity, and (+) HVDC dielectric strength. Thermal conduction, partial discharge resistance, and dielectric breakdown strength were evaluated. The partial discharge resistance was studied continuously for 5kV/720Hz×500 hours with an IEC(B) electrode.
결핵균 PPD, 30-kDa 및 TSP 항원에 의한 치료전 폐결핵환자 말초혈액 단핵구의 IL-12 및 TNF-α 생성능
송창화,조은경,이지숙,김대수,임재현,김운옥,남현희,김화중,백태현,박정규,Song, Chang-Hwa,Jo, Eun-Kyeong,Lee, Ji-Suk,Kim, Dae-Su,Lim, Jae-Hyun,Kim, Un-Ok,Nam, Hyeon-Hui,Kim, Hwa-Jung,Paik, Tae-Hyun,Park, Jeong-Kyu 대한면역학회 2001 Immune Network Vol.1 No.3
To determine if initial infection with Mycobacterium tuberculosis changes the balance of cytokines between T cells and macrophages, we evaluated interferon (IFN)-${\gamma}$), interleukin-12 (IL)-12, and tumor necrosis factor (TNF)-${\alpha}$ productions by peripheral blood mononuclear cells (PBMC) from 15 untreated active pulmonary tuberculosis (TB) patients and 12 healthy tuberculin reactors (HTR). Freshly isolated PBMC were stimulated with Triton X-100 solubilized protein (TSP), 30-kDa or purified protein derivatives (PPD) antigen for 6, 18 and 96 hours. IL-12 p40 production by antigen-stimulated PBMC from TB patients was significantly decreased compared with that in HTR. In addition, IFN-${\gamma}$ production was significantly depressed in TB patients than that in HTR at a 96-hr stimulation. However, TNF-${\alpha}$ production was significantly higher in antigen-stimulated PBMC from TB than that of HTR. A pronounced increase in IFN-${\gamma}$ protein followed neutralization of IL-10 in early TB patients. However, neutralization of TNF-${\alpha}$ did not significantly alter IFN-${\gamma}$ induction in PBMC from TB patients. There were no significantly differences in the cytokine productions among three proteins, TSP, 30-kDa or PPD antigen. These results indicate that development of TB may be strongly associated with dysregulated productions of IL-12, IFN-${\gamma}$ and TNF-${\alpha}$, during the initial immune responses to M. tuberculosis. Further understanding of operative cytokine networks during human immune cell responses to protein antigens of M. tuberculosis may improve strategies for vaccine development.
휴석동 땅밀림형 산사태의 발생특성에 관한 연구 (Ⅱ) - 지형 및 수문특성 -
우보명(Bo Myeong Woo),임재현(Jae Hyeon Park),최형태(Hyung Tae Choi),전기성(Gi Seong Jeon),김경훈(Kyung Hoon Kim) 한국산림과학회 1996 한국산림과학회지 Vol.85 No.4
The geological and hydrological survey was carried out in Hyuseok-dong landslide area(10/㏊), Youngchoon-myeon, Danyang-gun, Choongcheongbuk-do. The results showed that the bed rocks in this area consisted of shale, sandstone and limestone, and the piles of stones debris were also scattered around the hill above the study area. Soil texture was sandy loam, and bulk density of the soil in the lower part of the area was higher than that of the upper part, but void ratio of the soil in the lower part was lower than that of the upper part . Subsurface water was springing out to the surface in many places in this area. In this area, the storms over 70㎜/day were frequent during the summer period from June through September. It was concluded that the occurrence of landslide had a close relationship with the geological characteristics, hydrological conditions and the rainfall distribution.