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양승학,이양범,이용중 울산대학교 1993 공학연구논문집 Vol.24 No.2
본 연구에서는 고성능 공진형 전력변환기의 실용화를 위해 병렬공진형 직류링크 전력변환 시스템의 설계방법을 제안하였다. 제안된 시스템은 기존의 반도체형 전력 스윗칭 소자에 비하여 제한적인 주파수 영역을 극복할 뿐만 아니라 전력손실량도 최소화 시켰다. 또한 이 시스템의 실용화를 위하여 시스템의 설계방향, 공진회로부의 구성부품, 그리고 주회로의 각 소자에 대한 설계사양도 함께 고려하였다. In this study, a design technology of the parallel resonance type DC-link power converting system is proposed to apply high-active resonance type power transducer in the industrial field. The proposed system not only alleviates the frequency limitation which is major drawback of the semiconductor type power switching device but also reduces the power loss. To realize the proposed system, we considered system design procedure, resonance circuit components, and design specification of each device of main circuit.
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김학균,양재근 서울産業大學校 1997 논문집 Vol.45 No.1
The purpose of this study is to analyze various attitudes towards sports programs. Two-hundred and thirty-one high school students were selected according to a systematic stratified cluster random sampling, and the Self-Administration Method was used for the questionnaire survey. In the collected questionnaire data, those samples which were not reliable were discarded and only reliable data were analyzed, using a PC. In this analysis, tables, percentages, a t-test, and correlation tests were used. The results were as follows: 1. Male students showed a stronger inclination towards sports programs than did female students. 2. High school students showed a higher intensity of immersion than did middle school students. 3. There was no significant correlation between conversation and intensity of immersion. 4. There was a high correlation between inclination towards sports programs and intensity of immersion.
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Wassermann反應의 變法에 關한 硏究 : 特히 Kolmer氏法에 對하여 Especially Kolmer's Method
李學喆,梁學道 慶北大學校 1962 論文集 Vol.5 No.-
The serum of the human suspected of being infected with Treponema pallidum has been tested by the Wassermann reaction, precipitation test (including flocculation test), Treponema pallidum agglutination test of Treponema pallidum immobilization test etc. The Wassermann reaction, however, has been found to be one of the most useful and reliable methods employed as laboratory aids to diagnosis. The methods of performing the test are legion and many modifications have been suggested to increase its reliability and sensitivity. Especially the cardiolipin-lecithin-cholesterol antigen investigated by Pangborn replaced effectively the crude tissue extract in most of current serodiagnostic test for syphilis. The authors undertook to disgnose a number of serum of the human suspected of being infected with syphilis in Pusan area, and the specimens were examined by Kolmer's method (serum dilution method) from the spring to the autumn of 1946. As a antigen the alcholic extract(added an alcholic solution of cholesterol) of heart-muscle from the healthy calf was employed in this examination. In performing the above procedure, the employed complement had to be treated with the cold method so as to be free of normal hemolysin in it, and varying amounts of the definite dilution of each of hemolysin, antigen and parient's serum were set up in a series of test tube, then they were titrated or examined with red blood cells and the other reagents respectively. Inasmuch as these amounts vary the volume of fluid in each tube was regulated by adding the amount of saline solution which brings the volume to 3㎖. or 4㎖. The various amounts are given in Table 1. In these respects the above method was extremely inconvenient, so that following modified method was made in our laboratory. The method is given in Table 3. 1. The amount of suspension of red blood cells was kept constant (2.5% 0.5㎖.) and the reagent to be titrated or examined in the preliminary test and complement fixation test was set up in a series of test tube with each 0.5㎖. of it diluted by two-fold series dilution(except the titration of complement), then each 0.5㎖. of saline solution was added to a series of test tube in order to bring the volume to 2.5㎖. 2. In the first place, the titration of hemolysin was tested with the complement including normal hemolysin and red blood cells, then the titration of complement was tested by using two units of the previously titrated hemolysin (included into 0.5㎖. of the definite dilution). And each two units of the titrated hemolysin and complement (included into 0.5㎖. of the definite dilution) were used in the following preliminary test (the titration of anticomplementary effect of antigen and antigenicity of antigen) and complement fixation test. 3. The complement fixation test was cardiod out with 0.5㎖. of the definite dilution of antigen determined by previous titraion and above each two units of hemolysin and complement. Repeated experiments with the above modified method have given consistently satisfactory results. The princeples of its procedure are in no way different from Kolmer's method and rationale of complement fixation in general.
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인슐린 비의존형 당뇨병 환자에서 혈장 Endothelin-1농도의 변화
신양수,조희충,김원식,국기용,김용화,정종훈,문철웅,배학연,양성훈 朝鮮大學校 附設 醫學硏究所 1992 The Medical Journal of Chosun University Vol.17 No.2
Endothelin(ET) is a 21-residue peptide originally isolated from the cultured porcine endothelial cells. There are at least three genes for endothelin:endothelin-1(ET-1), endothelin-2(ET-2), and endothelin-3(ET-3). Endothelins are present in various human biological fluids including plasma, urine, breast milk, and saliva and have been found elevated plasma ET concentrations in patients with diabetes mellitus, Patients undergoing maintenance hemodialysis due to chronic renal failure, patients with acute myocardial infarction, and patients with subarachnoid hemorrhage. Endothelial cell damage is suspected to occur in diabetic patients and may be one important cause of angiopathy, a major complication in diabetes mellitus. The elevation of ET in diabetic patients may be a marker of, and further exacerbate, their vascular disease. We measured the levels of ET-1 in plasma of 50 patients with non-insulin dependent diabetes mellitus(NIDDM) and 25 normal subjects by radioimmunoassay. The plasma ET-1 concentration (mean±S.D.) in NIDDM was 6.461 A2.510 f㏖/ ㎖, and was significantly higher than in normal subjects (4.567±1.155f㏖/㎖) (P<0.05). The plasma ET-1 concentration (mean±S.D.) in diabetic retinopathy group( 7.15±2.454 f㏖/ml) was significantly elevated than those in otherwise uncomplicated groups (5.348±2.390 f㏖/㎖)(P<0.01). The correlation between any clinical parameters and plasma ET-1 levels in NIDDM was not significant, In conclusion, this study suggest that the elevated levels of ET-1 in diabetic patients may be play a important role in the pathogenesis of diabetic complications.
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목학수,양태일 한국경영과학회 2002 한국경영과학회 학술대회논문집 Vol.- No.1(1)
A module design aims to develop product architecture that consists physically detachable units such as module. To develop the system of module design, this paper suggests the methodology of part grouping, evaluation of modularization of a product for improving modularization. To determine modules, module concept is proposed to satisfy the objectives of a modular design. Therefore, there are functional, structural, and process modularizations in a modular concept. Module grouping can be accomplished by using an optimization model that maximizes the sum of the weighting. The present study proposes the p-median model and the direct clustering technique. The optimal clustering solution can be obtained by comparing two clustering techniques. To find the best solution among part groups, evaluation of modularization is performed based on the concept of module design. For the evaluation of modularization, evaluation criteria of modularization are used in the matrix table.
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