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혈액 투석 환자에서 투석중 정맥압과 요소재순환율 측정에 의한 동정맥루 협착의 조기진단
김영옥(Young Ok Kim),전희경(Hui Kyung Jeon),박용근(Yong Kun Park),윤선애(Sun Ae Yoon),송하헌(Ha Hun Song),김남일(Nam Il Kim),김용수(Yong Soo Kim),김석영(Suk Young Kim),최의진(Euy Jin Choi),장윤식(Yoon Sik Chang),방병기(Byung Kee Bang 대한내과학회 1998 대한내과학회지 Vol.54 No.6
N/A Objectives: The most cammon cause of vascular access loss is thrombosis, usually caused by venous stasis associated with venous stenotic lesions. Therefore early detection of venous stenosis is very important. We studied the correlation of venous dialysis pressure and urea recirculation ratio to venous stenosis in chronic hemodialysis patients. Methods: Venous dialysis pressure and urea recirculation ratio were measured at extracoporeal blood flow of 200 ml/min thruugh 16 gauge needles within initial 30 minutes in 80 chronic hemodialysis patients. Venography was performed in patients with elevated venous dialysis pressure (>100 mmHg) or urea recirculation ratio (>15%), and if significant stenosis was found, venous dialysis pressure and urea recirculation ratio were reevaluated after percutaneous transluminal angioplasty (PTA). Results: Of the total 80 patients, 30 patients had elevated venous dialysis pressure or urea recirculation ratio. In patients with elevated urea recirculation ratio, venous dialysis pressure was high (102±21 mmHg vs 71±20 mmHg, P<0.001) and the past history of subclavian catheterization ipsilateral to fistula site was also high (39.1% vs 15.8%, P=0.02). There were no differences between two groups in terms of age, sex, diabetes mellitus, duration of hemodialysis, fistula site, and interneedle length. Of the total 27 patients undergone venography, 14 patients (51.9%) had venous stenosis. PTA was performed in 11 significant stenotic lesions in 5 patients and initial success rate of 91% was obtained, After PTA, urea recirculation ratios significantly decreased (16.7±5.9% vs 5.0±3.6%, P=0.01) and venous dialysis pressures slightly decreased without statistical significance (117.4±23.0 vs 99.0±8.9 mmHg, P=0.058). Conclusion: Venous dialysis and urea recirculation ratio seem to be active indicator of venous stenosis and outcome of subsequent percutaneous transluminal angioplasty in hamodialysis patients.
이명천 ( Lee Myung Chun ),김은혜 ( Kim Eun Hye ),김인숙 ( Kim In Suk ),서한교 ( Seo Han Gyo ),홍성희 ( Hong Sung Hee ),김남일 ( Kim Nam Il ),김동수 ( Kim Dong Soo ),박순희 ( Park Soon Hee ),김혜진 ( Kim Hye Jin ),정선옥 ( Jung Sun 한국리듬운동학회 2016 한국리듬운동학회지 Vol.9 No.2
The average age of Korean healthy University students is 22±3 years. The daily recommended dietition allowanc(RDA) is about 2,600kcal for male and about 2,100Kcal for female University students in Korea. However, considering their lifestyle and individual differences are very large, and they have a lot of interest in weight control and healthy eating. In this regard, in this paper, we provide a comprehensive analysis with lecture materials and students` presentations collected in SHU University, discussed and summarized. We provide basic data that will enhance the quality of life of University students in Korea. Especially, the interest in body shape management is great and natural for Korean Fashion models who have physical activity and life style. In this case, healthy weight control and healthy eating are very meaningful to them. The various lectures and field discussions are not only helpful for real life, but also improve quality of life and self-esteem to them. And it will be a positive driving force for the development of model industry and confidence in Korea. After all, a healthy young people is a hopeful future for our country, and this hope will come true.
탄성좌굴 고유치 및 2차 탄성해석법을 이용한 평면강절프레임의 개선된 좌굴설계법
송주영,경용수,김남일,김문영,Song, Ju-Young,Kyung, Yong-Soo,Kim, Nam-Il,Kim, Moon-Young 한국전산구조공학회 2005 한국전산구조공학회논문집 Vol.18 No.2
탄성좌굴 고유치해석을 이용한 유효좌굴길이 산정법과 2차 탄성해석기법을 이용하여 축력과 휨모멘트를 받는 강절프레임의 보-기둥부재에 대하여 개선된 좌굴설계법을 제안한다. 이를 위하여 먼저 안정함수를 이용하여 보-기둥요소의 접선강성행렬을 유도하고, 탄성좌굴 고유치해석을 이용한 유효좌굴길이 산정법을 고찰한다. 또한 강절프레임에 대하여 소위 P-Delta 효과를 고려하는 2차 해석법을 제시한다. 해석예제를 통하여 먼저 2차 탄성해석과 기하학적 비선형해석에 의한 결과를 비교하여 2차 해석의 정확성을 검증하고, 강절프레임에 대한 기존의 설계법과 본 연구의 개선된 좌굴설계법에 대한 수치결과를 비교, 검토를 행한다. An improved stability design method for beam-columns of plane frames is proposed based on system buckling analysis and second-order elastic analysis. For this, the tangent stiffness matrix of beam-column elements is first derived using stability functions and a procedure for evaluating effective buckling lengths is reviewed using elastic system buckling analysis. And then the second-order analysis procedure is presented considering $P-\Delta$ effects and is compared with the closed-form solution through numerical examples. Design examples showing the validity of the proposed method we presented and their numerical results are compared with those obtained from the conventional stability design methods. Finally some useful conclusions are drawn.
좁은 다중 동축 석영관 내부서의 예혼합 화염의 전파 특성에 대한 기초 실험
조문수(Moon Soo Cho),백다빈(Da Bin Baek),김남일(Nam Il Kim) 한국연소학회 2013 한국연소학회지 Vol.18 No.2
Flame stabilization characteristics of premixed flames in narrow annular coaxial tubes (NACT) were investigated experimentally. The NACT burner was proposed as a model of a cylindrical refractory burner, and it was made of quartz tubes. Flame stabilization conditions affected by the characteristic length of the burner was investigated with the variation of the equivalence ratio and the flow rates. Flame behaviors in narrow spaces could be directly observed. Conclusively, more wide flame stabilization conditions could be obtained at the case of the decreased channel scale. A flame instability, such as combustion noise was detected concerned with the flame oscillation observed at the surface of multi channel stage. Some flame propagation characteristics had complicated tendencies that may exist in practical porous-media combustors. Therefore, this NACT burner can be a basic configuration for the development of flame stabilization model in porous media combustor, and it will enhance our understanding about the behavior of flames in meso-scale combustion spaces.
환형 5중 동축관 연소기 내부에서의 예혼합 화염의 전파 특성 직접 관찰
조문수(Moon Soo Cho),백다빈(Da Bin Baek),김남일(Nam Il Kim) 한국연소학회 2013 한국연소학회지 Vol.18 No.3
Flame stabilization characteristics of premixed flames in an annular coaxial 5-tubes burner (AC5TB) were investigated experimentally. The AC5TB was made of five quartz tubes, and the flame stabilization conditions in that burner were investigated with the variation of equivalence ratio and the flow velocities. Flame behaviors inside of narrow annular tubes could be observed directly. Overall flame stabilization conditions were similar to that of the previous study, while the flame behaviors and structures were different mainly due to the controlled uniform distribution of the velocities in channels. Flame flashback conditions were thought to be governed by the competition between heat release rate, heat loss and heat recirculation in each channel. Stationary flames at a fixed location were compared in its velocity distribution and burned gas temperature across the channel. This AC5TB can be a basic configuration for the development of flame stabilization model of porous media combustors, and it will help understand about the real behavior of flames in meso-scale combustion spaces.