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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.
( Seung Han Kim ),( Chang Duck Kim ),( In Kyung Yoo ),( Jong Soo Lee ),( Jae Min Lee ),( Seung Joo Nam ),( Hyuk Soon Choi ),( Eun Sun Kim ),( Bora Keum ),( Yoon Tae Jeen ),( Hong Sik Lee ),( Hoon Jai 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Capsule endoscopy is essential examination for diagnosis of small bowel bleeding. But diagnostic yield of capsule endoscopy is 38% to 83% in obscure overt GI bleeding. For an accurate diagnosis of cause of obscure GI bleeding, the time to perform capsule endoscopy is the most important factor. This study is to investigate the diagnostic yield, rate of therapeutic intervention and prognosis according to timing of capsule endoscopy in the obscure overt GI bleeding patients. Methods: We conducted a single center, retrospective study from April 2008 to April 2013. Patients who were negative result of initial upper endoscopy and colonoscopy were enrolled. We divided the patients into two groups: those who had performed capsule endoscopy within 2 days of last overt GI bleeding (=2-day group) and after 2 days of last overt GI bleeding(>2-day group). We compared the diagnostic yield, rate of therapeutic intervention, hospital day and rate of re-bleeding between the two groups. We defi ned positive fi nding as active bleeding or any cause of small bowel bleeding. Results: 102 capsule endoscopies were performed to evaluate obscure overt GI bleeding during the period. Among them, 81 patients were included and 21 patients who lacked of medical records were excluded. Diagnostic yield was 75% in =2-day group and 45% in >2-day group (p=0.022). Therapeutic intervention was done in 45% of the=2-day group and 14% of >2-day group (p=0.006). The average day of hospital stay was 5.7 days in =2-day group and 7.9 days in >2-day group (p=0.021). Re-bleeding rate between the =2-day group and >2-day group was not signifi cantly different. Conclusions: Early capsule endoscopic examination within 2 days of last overt GI bleeding may improve the diagnostic yield and rate of therapeutic intervention and length of hospital day.
( Han Jo Jeon ),( Seung Jeong ),( Hyuk Soon Choi ),( Se Hyun Jang ),( Sang Hoon Kim ),( Seung Han Kim ),( Jae Min Lee ),( Eun Sun Kim ),( Bora Keum ),( Yoon Tae Jeen ),( Hong Sik Lee ),( Hoon Jai Chun 대한소화기학회 2021 Gut and Liver Vol.15 No.2
Background/Aims: Chitosan, a natural polymer widely used in the biomaterials field, has been proposed as a potential submucosal injection solution. The purpose of this study was to compare the performance and efficacy of aqueous chitosan solution and commercialized submucosal injection fluids using a three-dimensional sensor and to evaluate the efficacy of the measured parameters. Methods: Normal saline (0.9% NaCl), as a control, Eleview<sup>®</sup> (Poloxamer 188), Blue Eye<sup>TM</sup> (0.4% hyaluronic acid), and aqueous chitosan solution (2.0%) were injected into the submucosa of porcine stomachs ex vivo. The mucosal elevation height, elevated surface area, and angle of the tangent of the submucosal fluid cushion were measured using a three-dimensional sensor. The rates of change for each variable were calculated, and the correlation between parameters was analyzed. Tissue specimens were stained with hematoxylin and eosin. Results: All variables exhibited the highest values under chitosan injection. The mucosal elevation height rate of change differed significantly between normal saline and chitosan solution (p=0.024). The elevated surface area rates of change for normal saline and Eleview<sup>®</sup> were significantly different from those for TS-905 and chitosan solution (p=0.006 and p=0.009, respectively). Further, height, area, and angle showed a positive correlation (p<0.001). A histological examination revealed an even distribution of aqueous chitosan within the submucosa without tissue damage. Conclusions: Aqueous chitosan was superior to normal saline and Eleview<sup>®</sup> and was noninferior to TS-905. A three-dimensional sensor and the measured parameters were effective and useful for evaluating the performance of submucosal fluids. (Gut Liver 2021;15:217-224)
Han, Ho-Chyul,Lim, Hyun-Chang,Hong, Ji-Youn,Ahn, Su-Jin,Han, Ji-Young,Shin, Seung-Il,Chung, Jong-Hyuk,Herr, Yeek,Shin, Seung-Yun Korean Academy of Periodontology 2016 Journal of Periodontal & Implant Science Vol.46 No.4
Purpose: The aim of this study was to determine the influence of anatomical conditions on primary stability in the models simulating posterior maxilla. Methods: Polyurethane blocks were designed to simulate monocortical (M) and bicortical (B) conditions. Each condition had four subgroups measuring 3 mm (M3, B3), 5 mm (M5, B5), 8 mm (M8, B8), and 12 mm (M12, B12) in residual bone height (RBH). After implant placement, the implant stability quotient (ISQ), Periotest value (PTV), insertion torque (IT), and reverse torque (RT) were measured. Two-factor ANOVA (two cortical conditions${\times}$four RBHs) and additional analyses for simple main effects were performed. Results: A significant interaction between cortical condition and RBH was demonstrated for all methods measuring stability with two-factor ANOVA. In the analyses for simple main effects, ISQ and PTV were statistically higher in the bicortical groups than the corresponding monocortical groups, respectively. In the monocortical group, ISQ and PTV showed a statistically significant rise with increasing RBH. Measurements of IT and RT showed a similar tendency, measuring highest in the M3 group, followed by the M8, the M5, and the M12 groups. In the bicortical group, all variables showed a similar tendency, with different degrees of rise and decline. The B8 group showed the highest values, followed by the B12, the B5, and the B3 groups. The highest coefficient was demonstrated between ISQ and PTV. Conclusions: Primary stability was enhanced by the presence of bicortex and increased RBH, which may be better demonstrated by ISQ and PTV than by IT and RT.