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반도체 소자의 성능과 신뢰성은 소자제조시 사용한 소재의 특성에 의존하므로 소재의 특성을 정확히 규명하는 일은 대단히 중요하다. 소재 특성화 방법중 분광 엘립소메츠리에 의한 기본소재 및 유전체 박막의 광학적 성질을 비접촉, 비파괴적, in-situ 상태에서 결정할 수 있다. 본 고에서는 소재의 광학적 특성화를 위해 분광 엘립소메츠리의 기본원리 및 측정방법, 반도체 소재 특성화의 응용 등에 대해 상세히 논의하였다.
The grafting of butyl methacrylate onto gelatin was investigated by potassium persulfate(KPS) redox system in aqueous solution. The optimum conditions of grafting were observed, and the physical property and the biocolnpatibility of graft copolymer membrane were examined. The gas permeability and the biodegradation by bacteria were decreased with the grafting percentage increased, and tensile strength increased with the grafting percentage increased.
The diagnosis of acute pancreatitis occurred in CAPD patients is quite difficult due to its clinical similarity with acute peritonitis. Delayed diagnosis and treatment of acute pancreatitis in CAPD patients may result in fatal complication. We experienced a case of acute pancreatitis in a CAPD patient. A 62 years old female visited the hospital with acute abdominal pain and cloudy effluent for 3 days. She has been on CAPD for 3 years and had two episodes of peritonitis at 6 months and 1 year before the admission. The causative organism was Streptococcus viridans in each episode. The peritonitis symptoms and peritoneal leukocyte count incresed despite of using Vancomycin^ⓡ and Netilmicin^ⓡ . Causative organism was not isolated from dialysis. Serum amylase concentrations increased from 105mg/dL at the admission to 1,052mg/dL on day 10 of admission. Abominal ultrasonography and abdominal computerized tomogram revealed fat iafiltration, focal necrosis and multiple cyst formation at pancreas area. Computerized tomogram guided aspiration cytology revealed acute inflammation and necrosis. Bacteria were not found in the aspirate. Clinical symptoms were improved after discontinuation of CAPD and intraperitoneal use of antibiotics. The patient restarted CAPD on the day 18 and remained without complications. We report this case with a brief review of literatures.
Finite model eye with four aspheric surface, photopic VlSlon, and emmetropia was designed. The visual performance of model eye is predicted and compared. Designed model eye has variable pupil diarneter from 1 mm to 8 mm theoretically. At pupil diameter 4 mm, longitudinal ray aberration of model eye is 0.63 D. At wavelength between 470 nm and 650 nm, longitudinal chromatic ray aberration is 1.15 D. Airy disk diarneters are deterrnined by using point spread function and f-number. The visual performance of model eye of emmetropia, -0.50 D , -0.75 D, -1.00 D, -1.50 D, and -2.00 D myopia is predicted, and compared with clinical subjective refraction
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In this study, structural design of exhaust gas sensor of automobile was performed. In order to evaluate the structural design of the measurement sensor, the structural analysis was performed by the finite element method. The vibration and thermal stress analysis was carried out at the high temperature condition. Finally, the structural test of sensor system was performed, and used for comparison with the analyzed model. Through the structural analysis and test, it is confirmed that the designed measurement sensor structure is acceptable.