http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
차승훈,정상원,박석돈 圓光大學校 醫科學硏究所 1999 圓光醫科學 Vol.15 No.1
Background: Erythema multiforme (EM) is an acute self-limited disease with distinctive skin lesion. Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) has been regarded as variants of EM within continuous spectrum. The reports that EM with mucous membrane involvement and SJS are clinically different disorders prompt us to investigate the relationship between clinical features and causative factors of these dermatoses. Methods: A retrospective clinico-histopathologic study was performed in 59 patients from 1988 to 1996. Results: While most of EM patients showed typical target, raised atypical target, or flat atypical target, purpura with or without blistering was noted in 80% of SJS patients and all of TEN patients. In EM patients, the skin eruption was mainly located acrally or centrally, diffuse involvement was observed in all of TEN patient. The involved skin surface area was wider in SJS and TEN than EM. Through the review of histopathologic slides, we found that 74% (17/23) was inflammatory type which was diagnosed as EM in 76% patients. Drug was the most common causative factor (41%), and there were the clinical evidences of recurrent herpes simplex virus infection in 12% (7/59) patients. Conclusion: We conclude that there is no difference in clinical features of EM, SJS, and TEN compared with reported studies. A detailed and precise prospective study is necessary to elucidate the clinical features and etiology of these unique dermatoses.
Oxalate와 Enrofloxacin투여한 랫트신장에 대한 병리조직학적관찰
오원석,이차수,오규실,정원일,정재용,정다히,정규식 한국임상수의학회 2003 한국임상수의학회지 Vol.20 No.4
To investigate the renal effects of enrofloxacin administration on rats induced with dehydration or hyperoxaluria, male rats were treated with enrofloxacin of 50 mg to 500 mg/kg b.w.. The microscopical observations of kidney and urine sediment were carried out in the experimental groups. The result obtained were as follows; The male rats deprived of water for 72 hours and administered with enrofloxacin. As enrofloxacin administration dose was increased, clinical signs such as loss of appetite, depression, weakness, and loss of urine output became more severe. In the histopathological findings, there were hyperemia and hemorrhage in renal cortex, vacuolation and necrosis of renal tubular epithelia, proteinous casts within renal tubules. The male rats were orally administered with sodium oxalate and injected with enrofloxacin for 7days. As enrofloxacin administration dose was increased, clinical signs such as the loss of appetite and water consumption, and weakness became more severe. In the histopathological findings, there are hemorrhage of glomeruli and cortical hyperemia, vacuolation and necrosis of tubular epithelia, proteinous casts in renal tubules. In the microscopical findings of urine sediment, there are calcium oxalate crystal (diamond-like type) and magnesium ammonium phosphate crystals (rhomboid). The male rats were intraperitoneally injected with sodium oxalate and administered with enrofloxacin for 7days. As enrofloxacin administration dose was increased, clinical signs such as the loss of appetite and water consumption, weakness were more severe. In the histopathological findings, there were hyperemia and hemorrhage in both glomeruli and renal cortex. Severe necrosis of renal tubular epithelia, bluish materials within renal tubules were also found. In the microscopical findings of urine sediment, there were many calcium oxalate crystals. The present results suggest that enrofloxacin has some injurious effects in rats having dehydration or hyperoxaluria, and clinically, we should consider these renal injury effects when we use enrofloxacin in patients accompanied renal disease, dehydration and hyperoxaluria conditions.
홍명석,차정연 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.1
bowl-in 형식의 피스톤을 가진 모터드 앤진에서의 스월유동을 LDV로 측정하였다. 피스톤 bowl과 스퀴시에서의 유동특성을 실린더 축을 따라 여러 부분에서 세밀하게 측정하였다. 본 연구에서 광화이버에 의한 집광이 가능함을 확인하였고 2촛점의 동시 측정에 응용할 수 있게 되었다. GP-IB를 A/D 컨버터로 바꾸어서 많은 양의 데이터를 저장하는데 소요되는 시간을 단축할 수 있었다. 또한 신호에 대한 주파수 응답성이 향상되었다. 평균유속이나 난류를 구할 때 필요한 컷오프 주파수를 정량적으로 설정할 수 있게 되었다. Swirling flow in a motored engine with a bowl-in type piston was measured by Laser Doppler velocimetry(LDV). Through the detailed measurements at several sections along the cylinder axis, flow characteristics in the piston bowl and squish area were revealed. This study showed that photo-fiber can condense and apply to the measurement of 2 focus at the same time GP-IB is changed into A/D converter and we can save the time of storing data. And the frequency response for signal is increased. The cut off frequency which is needed to get the mean flow velocity and the turbulence was able to set up quantitatively.
AI/CFRP 혼성튜브의 적층각과 단면형상에 따른 축방향 압궤 특성
김선규,이길성,김성훈,차천석,김정호,양인영 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1
알루미늄은 수송기계용 구조부재로 널리 쓰이고 있으며 복합재료가 이러한 수송기계용 구조부재로 쓰일 때 경량화와 많은 에너지 흡수 측면이 기대된다. 알루미늄 튜브는 CFRP(탄소 섬유 강화 복합재료)튜브에 비해 압궤하중은 낮지만 안정적인 소성변형에 의해 압궤되는 반면 CFRP 튜브는 알루미늄 튜브에 비해 압궤하중은 높지만 불안정한 취성파괴에 의해 압궤된다. 따라서 알루미늄과 CFRP의 조합은 안정적이며 뛰어난 에너지흡수를 기대할 수 있다. 본 연구에서는 알루미늄 원형과 사각튜브의 외측을 CFRP로 감싸 Al/CFRP 혼성튜브를 제작하여 축방향 압궤특성에 관하여 연구하였다. 알루미늄 튜브와 CFRP 튜브의 압궤특성을 기초로 하여, Al/CFRP 흔성튜브의 이방성 재료인 CFRP의 적층각과 단면형상의 변화를 주었다. 실험결과, Al/CFRP 흔성튜브는 알루미늄 튜브의 좌굴을 계기로 하여 CFRP 튜브의 불안정한 취성파괴의 단점을 보완하였다. 경량화 측면에서 단위 질량당 흡수에너지는 원형튜브가 사각튜브에 비해 약 45~70% 이상 높았으며 CFRP 적충각이 90˚일 때 가장높았다. Aluminum materials have been widely used in various vehicle structures. If composite materials are applied to vehicle structures, it is expected that not only the weight of the vehicle is decreased but also it absorb large amounts of energy. Aluminum tubes are lower than CFRP (Carbon Fiber Reinforced Plastics) tubes in the collapse load but absorb energy by stable plastic deformation. On the other hand, CFRP tubes are higher than aluminum tubes in the collapse load but absorb energy by unstable brittle failure. The combination of aluminum and composite may result in stable deformation and excellent energy absorption efficiency. The compressive axial collapse tests were performed to investigate collapse characteristics of Al/CFRP compound tubes which are aluminum tubes wrapped with CFRP outside the aluminum circular and square tubes. Based on collapse characteristics of aluminum tubes and CFRP tubes respectively, the axial collapse tests were performed for Al/CFRP compound tubes which have different CFRP orientation angles and cross-sections. Test results showed that Al/CFRP compound tubes supplemented the unstable brittle failure of CFRP tubes due to ductile nature of inner aluminum tubes. In the light-weight aspect, Absorbed energy per unit mass of circular tubes was higher than square tubes'. Absorbed energy per unit mass showed highest when CFRP orientation angle was 90 degrees.
Expression, purification and crystallization of GSK3β in complex with the flavonoid morin
Jeong Seok Cha,Kuglae Kim,Jinsook Ahn,Hyun-Soo Cho 한국구조생물학회 2018 Biodesign Vol.6 No.3
GSK3β is an important kinase that functions in cellular signaling pathways. Morin, a flavonoid that is plentiful in nature, was found as an inhibitor of GSK3β that can reduce tau pathology in vivo and in vitro. To identify how morin inhibits GSK3β, GSK3β protein was overexpressed and purified using affinity and ion exchange chromatography. GSK3β protein was crystallized with morin using hanging drop vapor diffusion method in the presence of 18 % (v/v) PEG 4000, 100 mM sodium citrate (pH 6.5), and 5 % (v/v) 2-propanol at 290 K. X-ray diffraction data was collected to a maximum resolution of 2.14 Å. The crystal belonged to P2 1 , with unit cell parameters a = 67.6 Å, b = 134.4 Å, c = 100.4 Å, α = γ = 90.0°, β = 103.8°.
저온 평판형 고체산화물 연료전지 내부 열 및 물질전달 현상에 대한 전산해석
정희석(Jeong, Hee-Seok),차훈(Cha, Hoon),손정락(Sohn, Jeong-Lak),노승탁(Ro, Sung-Tack) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.11
The performance prediction of a planar-type solid oxide fuel ceil is conducted by a computational analysis. The transport processes are formulated with the help of a simplified treatment of heat generation by the electrochemical reaction. From the result of the computational analysis, it is shown that the electrochemical reaction is closely related to the transport phenomena inside a solid oxide fuel cell. Transport phenomena including heat and mass transfer have influence on the distribution of local current density and as a result, on the performance characteristics of the fuel cell. Computational analysis is also extended to the parametric study to investigate the performance behavior of the fuel cell with different amount of supplied fuel flow rates. It is also demonstrated that the mathematical formulation and computational procedures proposed in this study can be applied to prove the importance of the specific TPB(Three-Phase-Boundary) area in the manufacturing process of electrodes in a solid oxide fuel cell.