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Wire Saw 슬러리로부터 Si와 SiC의 선택적 회수
한승열,이종대,전진혁,박노국,이태진,류시옥 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.1
This study was focused on the recovery of Si and SiC from wire saw slurry in wire saw slicing process. In order to separate Si and SiC from wire saw slurry, alkali dissolution method was used and then Na₂O showed superior dissolution property of Si. At this time, SiC was separated as powder from alkali aqueous solution. Si was dissolved as a liquid in alkali aqueous solution. After removing SiC powder, the powder was obtained by drying alkali aqueous solution and then it's XRD analysis showed that it was the water glass (Na₂SiO₃).
신혁승,윤충한,한경동 한국국민경제학회 2003 경제연구 Vol.21 No.1
기술혁신 및 시장구조의 진화과정에서 효율적 기업이 계속하여 신기술을 독점하는 지배적 구조의 지속 현상(increasing dominance)과 각 기업의 기술적 우위와 계속하여 교차하는 현상(action-reaction)이 어떠한 상황에서 발생하게 되는지를 기업의 기대 종류, 기업의 초기비용 구조 등을 통해 살펴보고, 특히 정보통신산업에서 나타나는 네트워크 외부성의 존재가 기업의 기술혁신 유인과 시장구조의 진화 패턴에 미치는 영향을 고찰하고 있다. We examine the evolution of market structure by technological innovation. There are two kinds of phenomena in the evolution. One is the 'increasing dominance' where the efficient firm continues to be a leading firm. The other is the 'action-reaction' where technological superiority of firms changes over time. We derive the conditions under which these two phenomena occur. Also, we look at the effect of network externality on the pattern of the innovation incentive and market evolution.
오영상,이은우,정종혁,문승원,김수현,김동한,양혁승,박정환,박경옥,강성수,이영직 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Tracheobronchopathia osteoplastica is a rare disorder of unknown cause characterized by the projection of numerous bony or cartilaginous submucosal nodules into the tracheobronchial lumen with sparing of the posterior membranous portion of tracheobronchial tree. In the past, most of the cases were diagnosed as secondary finding at autopsy. Nowaday, the key component of the evaluation is flexible fiberoptic laryngoscopy and bronchoscopy, which typically demonstrates irregular spicules of subrnucosal bone and cartilage projecting into the tracheobronchial lumen and causing various degrees of airway obstruction. A 45 years old man was visited Sunchon St. Carollo hospital due to discomfort on throat. We saw several nodules just below vocal cord via laryngoscope. The computed tomography revealed multiple small calcified nqdules on trachea and both main bronchi. Pathologic finding of bronchoscopic biopsy showed abnormal proliferation of bony and cartilagious nodules in the tracheal submucosa. These fingdings were consistent with tracheobronchopathia osteoplastica. We report here on a case of tracheobronchopathia osteoplastica with review of literature.
Rifampicin에 의한 것으로 추정되는 위막성 대장염1예
김수현,이은우,정종혁,문승현,김동한,양혁승,오영상,김호동,김도현,박혁,박정환,박경옥,이영직 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Pseudomembranous colitis, caused by altering the normal colonic flora and allowing the multiplication of Clostridium difficile, is an deleterious adverse effect of antibiotics. But it is rarely reported by rifampicin. Rifampicin is one of the first line drug in the treatment of tuberculosis and many patients are exposed to its potential adverse effects. We experienced a patient that had abdominal discomfort and hematochezia due to pseudomembranous colitis after receiving antituberculous medication, and which was probably caused by rifampicin. A 82 years old man was admitted with abdominal discomfort and hematochezia for one week. On the past history he had been diagnosed as endobronchial tuberculosis about 4 months ago. Colonoscopy revealed multiple discrete whitish mucosal lesion on rectosigmoid colon, and histologic findings were consistent with pseudomembranous colitis. The antituberculous agents were discontinued and vancomycin was administered. The patient's symptoms were resolved within several days. There was no recurrence after reinstitution of the antituberculous agents excluding rifampicin. We report here on a case of pseudomembranous colitis probably due to rifampicin.
Mild Traumatic Brain Injury and Subsequent Acute Pulmonary Inflammatory Response
Seung Hyuk Lim,Harry Jung,Dong Hyuk Youn,Tae Yeon Kim,Sung Woo Han,Bong Jun Kim,Jae Jun Lee,Jin Pyeong Jeon 대한신경외과학회 2022 Journal of Korean neurosurgical society Vol.65 No.5
Objective : The influence of moderate-to-severe traumatic brain injury (TBI) on acute pulmonary injury is well established, but the association between acute pulmonary injury and mild TBI has not been well studied. Here, we evaluated the histological changes and fluctuations in inflammatory markers in the lungs to determine whether an acute pulmonary inflammatory response occurred after mild TBI. Methods : Mouse models of mild TBI (n=24) were induced via open-head injuries using a stereotaxic impactor. The brain and lungs were examined 6, 24, and 72 hours after injury and compared to sham-operated controls (n=24). Fluoro-Jade B staining and Astra blue and hematoxylin staining were performed to assess cerebral neuronal degeneration and pulmonary histological architecture. Quantitative real-time polymerase chain reaction analysis was done to measure inflammatory cytokines. Results : Increased neuronal degeneration and the mRNA expression of interleukin (IL)-6, tumor necrosis factor (TNF)-α, IL-10, and transforming growth factor (TGF)-β were observed after mild TBI. The IL-6, TNF-α, and TGF-β levels in mice with mild TBI were significantly different compared to those of sham-operated mice 24 hours after injury, and this was more pronounced at 72 hours. Mild TBI induced acute pulmonary interstitial edema with cell infiltration and alveolar morphological changes. In particular, a significant infiltration of mast cells was observed. Among the inflammatory cytokines, TNF-α was significantly increased in the lungs at 6 hours, but there was no significant difference 24 and 72 hours after injury. Conclusion : Mild TBI induced acute pulmonary interstitial inflammation and alveolar structural changes, which are likely to worsen the patient’s prognosis.
( Seung Han Kim ),( Hoon Jai Chun ),( In Kyung Yoo ),( Jae Min Lee ),( Seung Joo Nam ),( Hyuk Soon Choi ),( Eun Sun Kim ),( Bora Keum ),( Yeon Seok Seo ),( Yoon Tae Jeen ),( Hong Sik Lee ),( Chang Duc 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Copper ions are trace elements which act as cofactors of superoxide dismutase with antioxidant effect and is related to reduce molecular oxygen in living system. Several studies have demonstrated that serum copper ion level are elevated in several malignancies. But, there was no multiphoton(MP) probe which can measure quantifi ed value of copper ions in intact tissue without grinding or drying off. The study aim was to develop ratiometric MP probe for measuring quantified value of Cu2+ and observe colon neoplasm with MP microscopy. Methods: We have developed a two-photon(TP) probe for Cu2+ with an internal reference. We have employed an extended coumarin as the fl uorophore (FL, red emission) having 2-picolymethylamide moiety at the 2-position as the Cu2+ chelator. FL was connected through a piperazine linker to a chromene derivative, which was employed as an internal reference (IR, blue emission). We had validated the two-photon excited fl uorescence (TPEF) intensity ratio of FL and IR so that a quantitative measurement of Cu2+ in live tissue was possible. We performed current study with validated ratiometry probe. Tissues of normal colon mucosa, colon adenoma and colon cancer obtained during colonoscopic biopsy were stained with MP probes for Cu2+ and were observed with MP ratiometry probe. Results: We could measure a quantitative measurement of Cu2+ in fresh intact colon mucosal tissue with ratiometric multiphoton probe. The concentration of Cu2+ of colonic adenocarcinoma was 16.9uM (range 15-18), adenoma 13.5 uM (range12.5-14.5), normal colon mucosa 11.5 uM (range 11-12.1), respectively. Conclusions: Cu2+ quantifi cation was possible with multiphoton ratiometry probe in fresh intact colon neoplasm tissues. Future study is warranted to assess antioxidant status of neoplasm tissues using probe based multiphoton microscopic analysis.