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윤오남,정혜윤,임영란,김보정 朝鮮大學校 스포츠科學硏究所 2004 스포츠科學硏究 Vol.15 No.-
The questionnaire are used for this research which has sex, school grade, health, father's scholarshiP, mother's scholarship, and a month pocket-money as a background variables, highschool students participating in the leisure activities as independent variable, the degree and satisfaction of leisure activities as parameter, and life satisfaction as dependent variable. The following results can be obtained from the analysis. First the result to analyze the mean difference of life satisfaction according to the demographic-social characteristics is that health, mother's scholarship and a month pocket-money has the meaningful difference, but there is no significant difference in the sex, school grade and father's scholarship. Second, the result to analyze the correlative relation among life satisfaction and six leisure participation satisfaction is that all the leisure participation satisfaction including psychological satisfaction, social satisfaction, relaxation satisfaction, environmental satisfaction, education satisfaction, and physiological satisfaction have significant positive correlative relation. In summary, it can be inferred that demographic-and-social variables and leisure participation satisfaction give much attribution to life satisfaction from the study.
윤영환,심인보 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
An expanded pipe is an important device in designing energy system such as combustion chamber, heat exchanger and turbulence generator. In this study, mean velocity distribution and turbulent, fluctuation component of u' in the expanded pipe of which diffuser angles are ½θ=90。, 60。, 30。 and 15。 from 16㎜φ pipe to 32㎜φ pipe are measured by LDV system. Reynolds number of the experiments are from 8,000 to 60,000 approximately based on diameter and mean velocity of the large pipe. From the experiments, velocity profile at 150mm downstream from the diffuser become closer to fully developed velocity profile as Reynolds number becomes greater and the diffuser angle becomes smaller. However, turbulent fluctuation components of u' were almost uniform or homogeneous at the same location across cross section of the pipe for almost measuring condition. Therefore, these experimental data could be utilized in design of turbulence generator with parameters of velocity. angle of the diffuser and distance from the diffuser. Furthermore, velocity profiles and turbulent fluctuation components at 50㎜ upstream from the diffuser are also measured in order to use these data as inlet condition in numerical computation for comparison between experimental and computational data in an expanded pipe.
인장력을 받는 CT형강 고력볼트 접합부의 감소계수 U값에 관한 연구
윤성호,김진숙,김원식,신영록,김보영,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
The purpose of this experimental study is to investigate the validity of code equation and table to calculate the reduction coefficient for effective net area in the limit state design code of steel structure and offer the basic research data for the effective net area of tee shape members in tension. The experimental tests were performed by loading the specimens through the flange with high strength bolt. Length of connection, number of bolt and the eccentricity are the parameters in test. According to result, the failure loads in test is less than predicted loads and it well showed when the predicted loads are based on reduction coefficient of the table in code. The lateral buckling of stem occurred in the members with big eccentricity and it reduce the failure loads. Therefore, we thought that an additional tests and research on the factors of effective net area is required.
김윤철,이정우,김보영,강정아,임대승,이민수,김정희,성보영,최성준,성인환,전은석 충남대학교 의과대학 지역사회의학연구소 2000 충남의대잡지 Vol.27 No.1
Coronary stent implacement is known as an effective treatment in the intimal dissection after percutaneous transluminal coronary angioplasty and the prevention of restenosis. However, In-stent restenosis still remains a major concern in clinical stenting. The stents were placed in 103 patients from July 1996 to March 1999 and performed follow-up coronary angiograms in 59(57.3%) patients. To identify the clinical, angiographic and procedurerelated variables 'which predict late restenosis within the stented artery, 59 patients(58.3±9.9, M:F= 41:18) were studied. The clinical characteristics of the patients were stable angina in 23(39.0%), unstable angina in 14(23.7%), acute myocardial infarction in 21(35.6%) and old myocardial infarction in 1(1.7%). Coronary stenting was performed in 1 patient(1.7%) for primary lesion, 50 patients(84.7%) for suboptimal results after PTCA, 6 patients(10.2%) for bail-out procedure, and 2 patients(3.4%) for restenotic lesions. All patients were treated with aspirin and ticlopidinc. The follow-up angiograms were obtained at 7±4 months. The overall in-stent restenosis rate was 27.1%. The coronary angiographic findings were 32 single vessel(54.2%), 19 two vessel(32.2%) and 8 three vessel disease(13.6%). The angiographic morphological characteristics were type A in 33(55.9%), type B in 14(23.7%), type C in 12(20. 3%) cases. Variables of 16 patients with restenosis were compared with those of 43 patients without restenosis. Previously known predictors for in-stent restenosis were multiple stenting, stenting for restenotic lesions, residual stenosis after stenting, stenting for total occlusion lesions, reference diameter, balloon to vessel ratio, acute gain and minimal luminal diameter after procedure, design and characteristics of stents, ostial lesion of aorta, high pressure method for stenting, lesion length, diabetes mellitus, size of artheroma, saphenous vein grafts, ulcerlating lesions and calcified lesions. In this study, Reference diameter before stenting(2.43±0.54mm vs. 2.88±0.65mm, p=0.016) and balloon-to-artery ratio(1.28±0.26 vs. 1.11±0.18, p=0.006) were predictors for in-stent restenosis. 1) The overall in-stent restenosis rate was 27.1%. 2) In the analysis of predictors for in-stent restenosis, there was no significant differences in clinical, angiographic factors between group with restenosis and without restenosis. But, Only reference diameter before stenting and balloon-toartery ratio were predictors of late in-stent restenosis. In conclusion, stenting is effective revascularisation method for selected patients with ischemic heart disease, and to minimize in-stent restenosis rate, stent implanting is achieved in a large vessel on the basis of an artery-to-stnet ration of 1:1, if possible.
이보선,윤필규,이필영 龍仁大學校 1998 용인대학교 논문집 Vol.15 No.-
In order to study a program for exercise prescription that can satisfy both safety and effectiveness on the basis of exercise strength according to heart rate during aerobic dance a study was made with thirty members of mothers' aerobic classroom as an object for twelve weeks(conducted five times a week) at S sports center and following conclusions have been obtained. Firstly, as a result of having aerobic exercises for twelve weeks and measuring heart rates the values of heart rate after twelve weeks by each stage of exercise fell significantly compared with the time when they started the exercise. Secondly, the matters for investigation prior to exercise such as physical strength test on the basis of heart rate before starting exercise or the past history of a case were not being kept properly. Thirdly, when performing the exercise they were all doing exercise with the same strength at the same time without entirely considering age or weather-or physique condition. Fourthly, as standards of heart rate for each stage of warming-up exercise, main exercise and adjustment exercise were not established there was no adequate program of exercise prescription.