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Azathioprine에 반응을 보인 류마티양 관절염에 의한 경막염(Pachymeningitis)1예
배광봉,이정호,이정찬,곽상혁,강정현,김철희,김현수,김종숙,조덕연,김삼용 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1
Rheumatoid arthritis frequently involves the cervical spine and may lead to neurologic impairement. However, direct involvement of CNS structures by inflammatory cells has been reported infrequently. The prevalence of this complication of rheumatoid arthritis is unknown. Inflammatory CNS involvement in rheumatoid arthritis reportedly occurs in the setting of longstanding, active, erosive articular disease and is accompanied by extracranial and extraspinal nodules and vasculitis. This is diagnosed by radiologic finding of CNS nodules or meningeal thickening and by biopsy or autopsy. Treatment with corticosteroid, cytotoxic agent or surgical decompression is helpful. But the majority of patients die within several months of onset of neurologic symptom. Recently, we experienced a case of pachymeningitis caused by rheumatoid arthritis, which resolved repeatedly with azathioprine treatment.
Effects of layer-by-layer assembled PEI/MWCNT surfaces on enhanced pool boiling critical heat flux
Seo, Gwang Hyeok,Jeong, Uiju,Son, Hong Hyun,Shin, Doyoung,Kim, Sung Joong Pergamon Press 2017 International journal of heat and mass transfer Vol. No.
<P><B>Abstract</B></P> <P>Layer-by-layer (LbL) assembly is a versatile deposition technique for the fabrication of nanostructured thin films on a substrate. In this study, multilayers of poly(ethylenimine) (PEI) and multi-walled carbon nanotubes (MWCNTs) were deposited onto a stainless steel surface. Since a substrate experiences notable changes in surface characteristics and structures during the LbL deposition process, resulting surface characteristics were thoroughly investigated. It was found that randomly oriented porous structures were developed by the fibrous wires of MWCNTs. As a result, surface roughness increased by 20–30%, and surface wettability increased by 70% for all samples. Both roughness and wettability were improved as the bilayer number increased. After the surface modification process, pool boiling heat transfer experiments were conducted to investigate the thermal margin achievable with the LbL deposition. Critical heat flux (CHF) enhancement was obtained as the number of bilayers increased, with the maximum enhancement evaluated at 94%. The enhancement was mainly attributed to the improved surface characteristics due to the formation of porous structures in the PEI/MWCNT layer. The comparison works with newly proposed CHF correlations supported the wicking effect on the CHF enhancements for the LbL-assembled test samples. Image processing results indicated a desirable structure for improved capillary action, which could affect further wetting to dry spots. High-speed bubble departure images were obtained from which a few msec reduction in rewetting intervals was observed for all LbL-assembled heaters.</P> <P><B>Highlights</B></P> <P> <UL> <LI> After LbL process, roughness and wettability were improved as the bilayers increased. </LI> <LI> LbL deposition of PEI/MWCNTs exhibited hydrophilic surfaces. </LI> <LI> Enhanced pool boiling CHF was observed with PEI/MWCNT-layered heaters. </LI> <LI> CHF enhancement was attributed to the improved wettability and porous structures. </LI> <LI> High-speed images of bubble departures demonstrated a reduced rewetting interval. </LI> </UL> </P>
콜린로우의 맥락주의적 관점에서 본 알바 알토의 건축 어휘에 관한 연구 - 알토의 콜라주를 통한 ‘이질적 조화’를 중심으로 -
정광혁(Jeong, Gwang-Hyeok),구영민(Koo, Young-Min) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.2
Existing studies of Alvar Aalto’s architecture tended to adapt to Finland’s nature, history and traditions, focusing on the organic combination of space, form and materials, and to lock them in the concept of regionalism. The aim of this study is to extend Alto’s architectural approach from Colin Low’s contextualist perspective to a more general concept, and to rediscover the dialogue that penetrates the orthodox history, especially with an uncomfortable harmony through the insertion of Alto’s undulating elements since the 1930s.
( Gwang Seok Yoon ),( Sang Don Park ),( Yong Soo Baek ),( Man Jong Lee ),( Sung Hee Shin ),( Dae Hyeok Kim ),( Jun Kwan ),( Keum Soo Park ),( Seong Ill Woo ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: We sought to fi nd differences of clinical and angiographic characteristics in ST-segment elevation myocardial infarction(STEMI) patients with or without coronary microvascular dysfunction by index of microcirculatory resistance (IMR). Methods: STEMI patients who underwent primary percutaneous coronary intervention (PCI) were enrolled. Baseline characteristics including clinical and angiographic characteristic were investigated in all patients. The IMR, parameter of hyperemic microvascular resistance, was measured with a pressure sensor/thermistor-tipped guide-wire after primary percutaneous coronary intervention (PCI) Results: 113 STEMI patients (age=56±11 years, M:F=95:18) were enrolled and 113 culprit lesions of coronary artery were analyzed. The patients were divided into three groups based on following the value of IMR: Low-IMR (n=38, IMR=12. 9±2. 6 U), Mid- IMR (n=38; IMR=23. 9±4. 0 U) and High-IMR group (n=37; IMR=48. 1±17. 1 U). Mean age of Low-IMR was signifi cantly younger than Mid-IMR and High-IMR. Mean doorto- balloon times were under 90 minutes in all IMR groups, and there were no significant differences among each IMR groups. However, symptom-onset-to-balloon time was signifi cantly longer in High-IMR than Mid-IMR and Low-IMR (p<0. 001). The high IMR group included the more frequent proximal location of culprit lesion than non-proximal location (p=0. 008). In multivariate regression analysis, age and symptom- onset-to-balloon time were independent determinants of higher IMR (p=0. 013 for age, p=0. 003 for symptom-onset-to-balloon time). Conclusions: Our data suggests that in STEMI patients with mean door-to-balloon time under 90minutes, age and symptom-onset-to-balloon time may be the main determinants of impaired microcirculatory resistance.
Study on precipitation of microcrystalline boehmite from bayer process solutions
Gwang Hee Shin,Chan Woong Park,Jong Hyeok Kang,Sang Yun Seo,Tam Tran,Myong Jun Kim 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.1
This study was carried out to develop a process for synthesising ultra-fine boehmite powders by precipitation from the Bayerprocess liquor at a temperature within the range 85 ~ 95 oC. The study was conducted to investigate whether boehmiteproduced by this technique has the same physical properties as those prepared by hydrothermal synthesis at elevatedtemperature and commercially available for use as fire retardant in plastic making. As with gibbsite, the precipitation ofboemite requires seeding in which α-boehmite seeds were first produced by pyrolysis of a plant ultra-fine gibbsite at 420 oCfor 60 min. The boehmite seeds of mean particle size (D50) of 0.30 μm were obtained through subsequent hydrothermalsynthesis. This process would yield a high purity well-crystalline boehmite of 1.30-1.47 μm mean particle size of low surfacearea (2 ~ 4 m2/g) as required for commercial fire retardants.