대동맥 분기부의 협착부에서의 혈액 유동 특성

신철수 한국교통대학교 2015 한국교통대학교 논문집 Vol.50 No.-

The three dimensional steady flows of blood and blood analogue fluids in the abdominal aortic bifurcation are simulated using the finite volume method. The objective of this investigation is to understand the generation and progression of specific atherosclerosis from a hydrodynamic point of view. Due to complexity of blood in conducting experimental study, aqueous polymer solution are used as the substitutional fluids. For comparison purpose of the flow characteristic of blood and substitutional fluids, rheology different fluids such as water soluble polymers of Carbopol-934 and Separan AP-273 are employed for the numerical simulation. In order to understand the role of hydrodynamic in the formation and development of atherosclerosis lesions flow velocities, pressures and shere stresses along the vessel are calculated for steady flows

임펠라 形狀과 回轉數가 펌프 性能에 미치는 影響

申澈洙 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.1

Pump characteristic due to the changes of impeller tip shape and operating speed are studied experimentally with a small volute pump. Pump characteristic curve for head-capacity and efficiency-capacity curves of three derivative models are compared with standard model. In conclusion, total head and efficiency of the derivative model are lover than those of the standard model.

볼텍스 펌프의 펌프 성능에 관한연구

申澈洙 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.1

Impeller shape and number of vanes change drastically the pump performance. In this study effects of the number of the vanes on non-clogging pump performances are studidied experimentally. Results show that the total head and the efficiency of non-clogging pump increase as the number of vanes increases.

그리기 활동을 통한 초등학생들의 환경에 대한 인식 분석

위수민,이승철,김윤지,김현정 韓國敎員大學校 敎育硏究院 2008 敎員敎育 Vol.24 No.2

이 연구는 초등학교 6학년 학생의 환경 인식은 어떤 특징을 가지고 있으며,학생이 생활하는 지역에 따라 환경 인식은 어떤 차이가 있는지를 알아보고자 하였다. 광주광역시와 경기도에 위치한 5개교 10학급 340명을 대상으로 환경에 대한 그리기 활동과 그림에 대한 설명 그리고 그림에 등장하는 환경 요소를 분석하여 학생들의 환경 인식을 확인하였다. 연구 결과,환경에 대한 인식은 인공 환경,자연 환경,인간 공존 환경,추상적 환경으로 표면화 되었으며,생물과 무생물 및 인공물을 포함한 다양한 환경 요소들올 표현하여 학생들의 일상적인 생활 주변의 환경 요소에 대한 높은 인식이 드러난 것으로 보인 다. 5 유형으로 구분한 거주 지역별 학생들이 갖는 환경 인식은 유의미한 차이를 보이지 않았고 인공 환경으로 인식하는 경우가 일반적이었다. The present study purposed to examine the charactehstics of sixth-graders'perception of the environment and difference in their perception of the environment according to area. For this study, we surveyed the perception of the environment in 10 classes 340 students from 5 elementary schools in Gwangju and Gyeonggi do by analyzing their environment related drawing activities, their explanations about their drawings, and environmental elements appearing in the drawings. According to the results of this study, sixth-graders'perception of the environment were described by artificial environment, natural environment, environment in which people live together, and abstract perceptions. In addition, they expressed various environmental elements such as living things, lifeless things and artificial things, and this shows their high perception of environmental elements around them. What is more, the sixth-graders from five different areas did not show any statistically significant difference in their perception of the environment, but perception as artificial environment was more general among the students.

인듀서 내부의 캐비테이션 유동과 흡입성능에 관한 연구

申澈洙,金鍾喆,姜宇政,李先基 충주대 산업과학기술연구소 1995 産業科學論文集 Vol.3 No.-

In order to understand the influence of the inducer inlet angle on cavitation and suction performance, experiments were carried out for two kinds inducer, which have the same outlet angle distribution, length and number of inducer blades. The results showed that the change of inducer inlet angles influenced not only internal flow conditions but also cavity flow and suction performance. The improvement of suction performance by using inducer were also discussed.

Non-Newtonian Fluid가 협착관에서 층류구역의 압력손실계수

신철수 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-

The pressure loss coefficient of Newtonian and non-Newtonian fluids in the stenotic tubes are determined experimentally and numerically. The numerical analyses for flows of non-Newtonian fluids in the stenotic tubes are conducted by finite element method. Non-newtonian fluids are made of water soluble polymers of Carbopol 934 and Separan AP-273. The effect of the contraction ratio and the ratio of length to diameter on the pressure drop are investigated by the experiments and numerical approach. Pressure loss coefficients of non-Newtonian fluids decrease just as those of Newtonian fluids in the laminar flow region. As the ratio of length to diameter increases the maximum pressure loss coefficient increases in the laminar flow region for both Newtonian and non-Newtonian fluids. Experimental results are used to verify the numerical analyses. Numerical results for the maximum pressure loss coefficient in the stenotic tubes are in fairly good agreement with the experimental results.

우유 중 Antibiotic Residues 검출과 살균처리에 따른 영향

양철영,이수한 서울보건대학 1995 서울보건대학 부설 한국보건과학연구소 논문집 Vol.1 No.1

국내에서 널리 사용되고 있는 세균 발육 억제 물질 검출 시험의 일종인 dye지시약으로 2,3,5-triphenyltetrazolium chloride을 이용한 방법과 속성 검출 시험 방법인 pnzym kit를 이용한 방법으로 원유, 시유의 항생물질 검출성, 시험방법간의 검출능 비교와 살균처리에 의한 영향을 고찰한 내용은 다음과 같다. TTC 시험에 의한 원유 중의 항생물질 검출성은 3개 시험구 60시료에서 평균 25.00%의 양성율을 나타내고, 평균 시험 소요시간은 198.25분이었고, penzym 시험에 의한 양성율은 43.33%이고 소요시간은 31.35분으로 필요로 하였다. 시유 및 가공유 중의 검출성은 15시료의 TTC시험에 의한 경우 13.33%의 양성율과 penzym시험의 경우 46.66%의 양성율을 나타내고 있다. TTC시험방법에서 penicillin G는 0.03IU/ml, cloxacillin은 1.0×10^(-10)g/ml, oxacillin, ampicillin 및 sulfamethazine은 1.0×10^(-15)g/ml까지 검출이 가능하였으며 penzym 시험방법에서는 penicillin G는 0.001IU/ml, oxacillin, cloxacillin, sulfamethazine은 1.0×10^(-15)g/ml, ampicillin은 1.0×10^(-11)g/ml까지 검출성을 보였다. 100℃이내의 살균온도와 유지시간에서는 항생물질의 농도와 검출성의 차이가 발생하지 아니하였다. penzym 검출시험 방법은 특이성, 신속성, 간편성 및 재현성이 있음을 실험결과에서 나타내었다. By 2,3,5-triphenyltetrazolium-2H-chloride test method(TIC) and penzym test method, antibiotic residues in raw milk and city milk was detected, and we compared penzym test with TIC test for antibiotic detection, and we investigated the effect of holding treatment(LTLT, HTST) of various antibiotics added in 12% skim milk. The results obtained are summarized as follows; In case of raw milk, inhibitor positive were 25.00% and 43.33% of 60sample by TIC test and penzym test, and experimental require times was 198.25 minutes and 31.35 minutes, respectively. In case of market milk, inhibitor positive were 13.33% and 46.66% of 15 sample by TIC test and penzym test. The concentration of detected antibiotics by TIC test of penicillinG and cloxacillin were 0.03IU/ml and 1.0×10^(-10)g/ml, oxacillin, ampicillin and sulfamethazine were 1.0×10^(-15)g/ml. The concentration of detected antibiotics by penzym test of pencillin G and ampicillin were 0.00lIU/ml and 1.0×10^(-11)g/ml, oxacillin, cloxoacillin and sulfamethazine were 1.0×10^(-15)g/ml. The antibiotic residues were no changed on the less than l00℃ of heat temperature by TIC reduction test and penzym test. This study showed various merit such as specificity, fastness, simple handling by penzym test.

유한해석 공식화의 이산화 방법에 의한 난류유동 해석에 대한 연구

신철수 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.4

The purpose of this study is to get discretization equation by the widely used Finite Analytic Method as numerial analysis thechiques for solving transport equation of flow problems.

대동맥 분기부에 발생한 협착부의 혈액 유동 특성

신철수 忠州大學校 2005 한국교통대학교 논문집 Vol.40 No.2

The three dimensional steady flows of blood and blood analogue fluids in the abdominal aortic bifurcation are simulated using the finite volume method. The objective of this investigation is to understand the generation and progression of specific atherosclerosis from a hydrodynamic point of view. Due to complexity of blood in conducting experimental study, aqueous polymer solution are used as the substitutional fluids. For comparison purpose of the flow characteristic of blood and substitutional fluids, rheologically different fluids such as water soluble polymers of Carbopol-934 and Separan AP-273 are employed for the numerical simulation. In order to understand the role of hydrodynamic in the formation and development of atherosclerosis lesions flow velocities, pressures and shere stresses along the vessel are calculated for steady flows

豚內 副産物의 特性과 加工利用에 關한 硏究 : Ⅱ. 加熱處理가 物理的 性質과 嗜好에 미치는 영향

양철영,이상건,윤정의,허윤행,채수규,노완섭 서울保健大學 1989 論文集 Vol.9 No.1