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

유체 유동 문제의 유한요소법 적용에 관한 연구

申澈洙 忠州大學校 1997 한국교통대학교 논문집 Vol.32 No.1

This study has been accomplished by offering the numerical analysis which is more useful to the parts of simulations of the actual models and time-speed than experimental investigation, for attaining she more detailed informations on flued flow. The finite element method is applied for fluid flow problems. 4 velocity-pressure formulation is used in the analysis. .4 mixed interpolation is employed for the velocity and pressure.

진공포장 수준이 돈육 건조품의 품질에 미치는 영향

양철영,채수규,이수한 서울보건대학 1996 서울보건대학 부설 한국보건과학연구소 논문집 Vol.3 No.1

Experiments were carried out to investigate the quality of dried pork jerky according to vacuum packaging level on the during storage at 20℃ and 40℃. 1. The changes of weight was decreased on vacuum level 76cmHg at 20℃, and the during storage at 40℃ was decreased as the follows: 76cmHg<non-vacuum<60cmHg, in order. 2. TBA values was increased as the follows: 60cmHg<76cmHg<non-vacuum, in order at 20℃, and the during storage at 40℃ were increased as the follows: 76cmHg<non-vacuum<60cmHg, in order with an increase in stroage periods. Also, there is no significant difference among the various vacuum level, storage periods and storage temperature. 3. The effect of water activity at 40℃ were higher than during storage at 20℃, as the water activity were decreased at storage period 120 days than initial period, also there is no significant difference among the storage periods. 4. Hhardness showed remarkably different according to vacuum packaging level, storage temperature and storage periods. Strength were remarkably influenced according to various storage conditions, and as the strength value at 40℃ were higher than at 20℃ in storage periods 12Odays. 5. The lightness(L) tended to decrease according to an increase in storage periods at 20℃ and 40℃, redness(a) showed remarkably different according to the various storage temperature from storage period 120 days, yellowness(b) were influenced highly at 40℃ on the vacuum packaging level. 6. Sensory score of overall acceptance for the vacuum packaging level to dried pork jerky were 4.35∼4.50 ranges at storage temperature 20℃. and the storage temperature 40℃ were 1.14∼1.64 ranges.

오징어 젓갈의 熟成中 組織化學的 變化에 관한 硏究

채수규,윤정의,양철영 서울保健大學 1993 論文集 Vol.13 No.1

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.

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.

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.

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.

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