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코팅 방식의 차이에 따른 고강도 마그네슘 합금 압출 금형의 특성 분석
김대하(D. H. Kim),주준식(J. S. Joo),이수영(S. Y. Lee),김상호(S. H. Kim),신혁기(H. G Shin) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
When executing extrusion of high strength magnesium alloy, it is done using various coating methods in order to restrain frictional force arises high temperature and high pressure. For extrusion molding, a coating method which produces a low coefficient of friction and reasonably a high surface hardness should be used. Nitriding is the most frequently using method for extrusion molding, but it also faces many limitations. Thus development of a new method is necessary to increase productivity and to produce high strength extrusion products. This study conducted a comparison analysis between the molds produced by CrAIN coating using PACVD method and that of nitriding. An abrasion test was conducted in order to analyze the difference in a coefficient of friction of the two coating methods during a rectilinear motion, and the hardness of the coated surface was analyzed. Also, to see whether the coating layer was evenly formed, the thickness of the layer was measured using SEM. To evaluate the productivity of extrusion of the two methods, a 60mm X 5mm sectional rectangular billets were extruded and analyzed the intensity of illumination of its surface.
증례 : Crouzon 씨병 ( 두개안면골화부전증 , Dysostosis craniofacialis ) 의 1 예
신현정 ( H. C. Shin ),이창홍 ( C. H. Lee ),김대하 ( D. H. Kim ),한용철 ( Y. C. Han ),강석영 ( S. Y. Kang ) 대한내과학회 1970 대한내과학회지 Vol.13 No.12
Premature synostosis of cranial sutures is called craniostenosis. The etiology of premature closure of the sutures is not known although many theories were described. The most generally accepted is that premature fusion is due to a defect in the portion of
腸티브스에 對한 Bactrim^(�) 治療의 臨床的 觀察
金大河,李重根,李昌弘,李宰燮,魯炳鎬 최신의학사 1971 最新醫學 Vol.14 No.1
The Present study was carried out in order to evaluate the therapeutic effect of Bactrim in 23 selected patients with typhoid fever who were admitted to the Department of Internal Medicine, Seoul National University Hospital during the 5 months period from March to July, 1970. They consisted of 14 males and 9 females. The age was ranged from 16 to 57 years, with mean age of 34.2. The patients included were bacteriologically (positive blood or stool culture) and serologically (Widal reaction above 1:160 in titer) confirmed cases and they did not take any antibiotic prior to admission. Bactrim was given orally 4 tablets daily in 2 divided doses for 14 days. Baseline studies including complete blood counts, urinalysis, stool examination, tests for bleeding tendency, liver function tests and bacteriologic sensitivity tests were done before administration of the drug and they were repeated at intervals 3 to 4 times thereafter by the time of discharge. E. K. G was also checked before and after treatment. Bactrim was effective in 21 (91.3%) out of 23 patients and the duration of fever after treatment was ranging from 3 to 7 days in responded cases. Treatment failure was considered to occur if fever did not subside within 10 days after initiation of therapy. There were 2 treatment failures. Two cases of relapse and one case of side reaction of the drug were noted in this study.
이창혜,김열자,김대하 최신의학사 1978 最新醫學 Vol.21 No.12
The Nephrotic syndrome is commoner in children than in adults, and because the "minimal change" lesion is by far the commonest underlying pathology in children. In adult life, the nephrotic syndrome is rather rare and only 20 to 30 percent of nephrotic adults can be expected to show a "minimal change" lesion. We describe 17 patients who developed a nephrotic syndrome after age of 15 years, and who showed a "minimal change" pattern in their renal biopsies. Among the 17 patients with "minimal change" lesions, 2 had spontaneous complete remission, 2 had complete remission with corticosteroids therapy and 1 died of severe cellulitis. 9 among the 12 surviving patients sustained remissions after drug with-drawal, and their renal function remains rather excellent. We report here our experience with "minimal change" glomerulonephritis in adult population and we have found that histologically seperating these patients into groups with "minimal change" lesions helps to predict their response to treatment as we as their subsequent clinical course.