건물내 라이프라인 배관의 내진성 향상을 위한 설계방법

辛太明,申澈洙,李洪西 충주대 2003 産業科學論文集 Vol.11 No.-

This paper emphasizer that seismic design of lifeline piping is necessary to avoid a secondary damage from earthquake like building fire. A large portion fo damage from the large historical earthquakes has been suffered surprisingly by post-earthquake fire. And it is well known that the fire had been caused by the failure of energy supply piping such as electricity pipes of gas pipes, of by the absence of rabid countermeasure system from failure of fire fighting equipment and water supply pipes. In this paper, it is discussed about a general seismic design method of building internal structure like lifeline piping and about a measure for reducing the seismic respones. As conclusions, it is proposed that lifeline piping should be simultaneously considered in the seismic design of building of importance for higher reliability.

90˚흐름 曲管에서의 數値 시뮬레이션

申澈洙 충주대 2000 한국교통대학교 논문집 Vol.35 No.1

In the present study, incompressible, isothermal, developing flow in a 90˚ rectangular cross sectional strongly curved duct with aspect rate 1:1.5 and Reynolds number of 106 has been investigated.In general, flow in a curved duct is characterized by the secondary vortices which are driven mainly by centrifugal force-radial pressure gradient imbalance, and the stress field stabilizing effects near the convex wall and destabilizing effects close to the concave wall.A numerical analysis has been conducted on the interaction of the thermal radiation and natural convection in a rectangular enclosure field with a gray fluid.As the Stark number increases or the optical thickness decreases, the boundary layer thickness and the flow velocity increase.Transition to turbulence is retarded with the increase of the radiation effect.When the optical thickness is one, the Radiation effect is negligible for the Stark numbers larger than 10.

N-S방정식에 대한 수치해법 적용에 대한 연구

申澈洙 忠州大學校 1993 한국교통대학교 논문집 Vol.28 No.-

The finite element method is applied to Navier-stokes equations. A velocity-pressure formultion is used in the analysis. A mixed interpolation is employed for the velocity and pressure. The approach is assessed by comparing the results with preditions of other authors, for various numerical test cases.

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

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.

PSCD를 이용한 NOx 저감에 대한 C₂H₄ 가스의 첨가효과에 대한 연구

신철수,강우정 충주대 산업과학기술연구소 1998 産業科學論文集 Vol.6 No.-

The purpose of this study is to investigate the reduction rate of NOx according to sever al parameters(NOx concentration, the flow rate of gas, the additional amount of C2H4, input voltage, input frequency and so on) when NOx is reduced by using PSCD(Pulse Streamer Corona Discharge). PSCD is based on the plasma-chemical technology, which induces narrow voltage pulses to binary electrode structure.

ADENINE이 ETHIONINE으로 야기된 간세포상해의 회복에 미치는 영향에 관한 전자현미경적 연구

신철야,손태중 慶北大學校 醫科大學 1972 慶北醫大誌 Vol.13 No.2

흰쥐에 ethionine을 체중 gm당 1㎎씩 투여한 군 12마리와 같은 조건을 준 후, 6시간만에 adenine을 재차 투여한 군 12마리의 간세포에 일어난 변화를 생리식염수 단독투여군, 생리식염수 투여 후, adenine을 투여한 군 및 ethionine 투여 후, 생리식염수를 투여한군등 대조군과 비교하여, 전자현미경을 중심으로 하여 관찰한 결과를 요약하면 다음과 같다. 광학현미경으로는 ethionine을 투여 하면, 3시간째에 이미 혼탁종창을 비롯한 변성성 변화를 나타내어 시간이 갈수록 심해져서 12시간때에는 죽음의 직전에 이른듯한 상을 보였으나, adenine을 투여한 군에있어서는 전체적으로 변화가 경미하였으며, adenine투여 후, 6시간째에는 3시간째 보다 오히려 회복되는 경향을 나타내었다. 전자현미경으로는 ER의 확장 및 ribosome의 탈락등 단백합성기구의 변화와 mitochondria에는 종창, cristae의 기대 및 부분적 파열상을 보이고 핵은 변연의 불규칙, 염색질의 감소등을 나타내었다. 이러한 변화는 시간의 경과에 따라 더 심해졌고, adenine투여후 3시간 째는 ethionine단독투여군과 거의 같은 정도의 변화가 있었으나, 그 이후는 오히려 회복이되고 adenine투여 9시간에는 거의 정상한 세포에 가까왔다. 그러나, adenine투여 후, lysosome은 증가 하였다. 이상의 실험적으로 보아 ethionine으로 인한 간세포의 상해는 adenine으로 회복이 가능하며, 회복이 불가한 세포내 소기관은 그 회복된 단백합성 능력으로 새로이 형성된 lysosome에 의해 처리되나, 새로운 lysosome의 형성은 시간이 어느정도 (본실험에 의하면 adenine투여 6시간후) 걸린다고 생각된다. There are many reports about the hepatotoxicity of ethionine and the reversibility of the injury by methionine, adenine, inosine and so on. Ethionine induces degenerative changes of the liver cell nucleus and various cytoplasmic organells for which adenine may reverse and prevent such alterations of them. The purpose of this observation is to review the alterations of cytoplasmic organells and nucleus and to attemp to study the relationship between structural and biochemical changes of hepatic cells, especially of those structures related to the lysosomes. DL-Ethionine (1 ㎎/ gm of body weight) was injected intraperitoneally to 24 rate and adenine sulfate (32㎎) was rsinjected intraperitoneally to the half of them 6hrs after initial injection. Control groups were received saline only, ethionine and saline, or saline and aden ine respectively. Each group of animals was killed at 3,6,9 and 12 hrs after the last injection respectively and the livers were taken from the rats. Sections of the tissue were observed under the light and election microscopes: The liver cells showed slight cloudy swelling in early time and progresssively severer in later time, but milder in adenine treated group. On the electron microscopical levels, liver cells showed dilatation of endoplasmic reticulum, shedding of ribosome, swelling and partial disruption of mitochondria, and increase of various types of the lysosomes. Most of the lysosomes in early stage were primary type but changed to secondary type in later time. Adenine injection induced production of new primary lysosome and recovering of the alterations of cytoplasmic organells. The results suggest that adenine can reverse ethionine induced alterations of the organells but already injured organells go on destruction by newly formed lysosomes.

수치해법을 이용한 비뉴턴유체의 내부유동 문제해석

申澈洙 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.1

The purpose of this paper is to apply the numerical simulation techniques to the internal flow problems of non-Newtonian fluids. Rheologically different fluids such as water, aquesous Carbopol solutions, aquesous Separan solutions and blood are employed for the numerical approach to understand flow phenomena in the stenotic tubes and the bifurcated tubes. Mathematical formulations of rheological properties for the non-Newtonian fluids are obtained by a function of the shear rate using the modified power-law model, the Carreau model, the modified Cross model and the modified Powell-Eyring model. The results of numerical application to the internal flow problems are as follows : (1) The numerical results for the non-Newtonian fluids in the stenotic tubes and bifurcated tubes are in good agreement with the existing experimental data. (2) The proposed modified power-law model is suitable to describe the rheological behaviors of the non-Newtonian fluids. (3) The pressure loss coefficient in the stenotic tubes for various flow conditions can be determined by numerical methods.

3차원 모델에서의 亂流 제트유동 예측

신철수 忠州大學校 2004 한국교통대학교 논문집 Vol.39 No.1

Turbulent jet in a cross flow on the symmetric plane is predicted by a quasi 3-dimensional mathematical model. The governing equations are solved by finite analytic method and partially parabolic procedure. a low Reynolds number model is used to solve the turbulent closure problem. In the case of the velocity ratio M=0.1 there are considered to describe the downstream development from the hole and found to be in good agreement with the published experimental results by other author. The quasi 3-dimensional mathematical model has been found to be quite economical and efficient.

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.