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The College Admissions Problem with Endogenous Choice of Admissions Policy Quality
이창화,왕규호 서강대학교 지암남덕우경제연구원 2017 시장경제연구 Vol.46 No.1
This study analyzes the role of an admissions policy, a stochastic relationship between student caliber and a college’s noisy evaluations of them. The college first announces an admissions policy and its quality, following which a frictional college admissions problem occurs. The college can be better informed of student caliber by adopting a high-quality admissions policy. The change increases the marginal student type, admissions rates, and college utility. The cutoff score, however, varies arbitrarily. At equilibrium, the college sets admissions policy quality lower than the socially optimal level, resulting in an inefficiently large pool of applicants.
미분화 교원섬유질환에 동반된 microscopic polyangiitis 1 예
이창화,심종걸,강경원,강종명,박찬현,박문향 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
Microscopic polyangiitis is a primary systemic vasculitis that involves small arterioles and capillaries. Clinical manifestations show generalized weakness, fever, myalgia, weight loss, oliguria, proteinuria, skin rash, neuromuscular symptoms. We describe a patient with unclassified connective tissue disease who developed microscopic polyangiitis. A 38 years-old woman admitted to our hospital due to hemoptysis. Laboratory results showed high creatinine, hematuria, proteinuria, positive p-ANCA(1:640), pulmonary fibrosis and hemorrhage on chest CT. Kidney biopsy showed focal segmental crescenteric necrotizing glomerulonephritis, foot process effacement on EM. Immunofluorescence study was negative. Her clinical feature, laboratory findings, and the kidney biopsy result were compatible with microscopic polyangiitis. The patient had been treated with prednisolne and cyclophosphomide. She was improved clinical sign and symptoms, decreased serum creatinine level.
Coproporphyrin 簡易 定量法의 改善에 關한 硏究
李昌和,宋東彬,車喆煥 고려대학교 의과대학 1984 고려대 의대 잡지 Vol.21 No.1
Rimington (1971) developed a satisfactory method for quantitative determination of urinary coproporphyrin (CP), which is essentially needed for diagnosis of lead poisoning in suspected persons. But it is found to be unsuitable for a mass screening because it is Iaborious and complex in its procedures. Soulsby (1974) modified the method into a simple and convenient one by reducing the steps in extraction procedure. In spite of its simplicity and usefulness for screening purpose, aythor experienced that CP determination by the method was inconsistent and erroneous. Thus, it was not satisfactory and acceptable if accurate determination of CP is needed as in screening test for lead poisoning. The present study was performed to find a simple and accurate method that is applicable for the quantitative determination and mass screening by modifying Soulsby’s method. The results were as follows: 1. The amount of CP extracted with diethylether was shown to be highly dependent on urine pH, when extraction was performed one time instead of three times. The optimal pH was 5.4 where 98% of CP was recovered with one time extraction. 2. When the diethylether layer was washed with distilled water, it was possible to avoid interference in UV-spectrophotometry caused by contaminated organic materials. 3. With modification as above, average recovery rate of CP from urine was 99.5% with a coefficient of variance 2.1% on vaiidity test. 4. The results suggested that Soulsby’s method can be improved to a method with both simplicity and accuracy by simple modifications, i.e., one time extraction with adjusting the urine pH to 5.4 and washing the diethylether later containing CP with distilled water.