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Microfluidic Applications for Flow Cytometeric Analysis of Cells and Particles
신세현(Sehyun Shin),구윤희(Yunhee Ku),서장수(JangSoo Suh) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Microsystems create new opportunities for conventional cell analysis by combining microfluidics and flow cytometry. This article describes recent developments in conventional flow cytometers and related microfluidic flow cytometers to detect, analyze, and sort cells or particles. Flow cytometry strongly consisted of fluidics, optics and electronics requires a large space to equip various components, which are mostly the fluidic components such as compressor, fluid handling system. Adopting microfluidics into flow cytometry enables volume- and power-efficient, inexpensive and flexible analysis of particulate samples. In this paper, we review various efforts that take advantage of novel techniques to build microfluidic cell analysis systems with high-speed analytical capability. Highly integrated microfluidic cytometry shows great promise for basic biomedical and pharmaceutical research, and robust and portable point-of-care devices could be used in clinical settings.
미립자를 포함한 현탁액의 전단율에 의존적인 열전도율 측정
이성혁,신세현,Lee, Sung-Hyuk,Shin, Sehyun 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.8
An effective thermal conductivity measurement for suspensions of microparticles in oil mixture is conducted in order to evaluate the shear rate-dependence of the thermal conductivity of suspensions. Measurements are made for rotating Couette flows between two concentric cylinders. The rotating outer cylinder is immersed into a constant temperature water bath while the stationary inner cylinder is subject to a uniform heat fluff. Test fluids are made to be homogeneous suspensions, in which neutrally buoyant microparticles ($d=25{\sim}300{\mu}m$) are uniformly dispersed. The present measurements show strong shear-rate dependent thermal conductivities for the suspensions, which are higher than those at zero shear rate. The shear rate dependent thermal conductivity increases with the particle size and volume concentration.4 new model for shear rate-dependent thermal conductivity of microparticle suspensions is proposed; the correlation covers from zero shear rate value to asymptotic plateau value at moderately high shear rates.
직사각형 덕트에서 Reiner-Rivlin 유체의 이차유동 및 열전달에 관한 수치해석
정석호,손창현,신세현,Jung, Suk Ho,Sohn, Chang Hyun,Shin, Sehyun 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.9
The present numerical study investigates the effect of a secondary flow on the heat transfer in order to delineate the mechanism of laminar heat transfer enhancement of a viscoelastic fluid in rectangular ducts. The second normal stress generating a secondary flow is modeled by adopting the Reiner-Rivlin constitutive equation and the calculated secondary flow showed good agreement with experiments. The primary velocity U as well as the pressure drop were not affected by the secondary flow in rectangular ducts, whose order of magnitude is less than 0.1% of the primary velocity. The small magnitude of the secondary flow, however, affect moderately the temperature fields. The calculated Nusselt numbers with secondary flow show 50% heat transfer enhancement over those of a purely viscous non-Newtonian fluid, which are considerably lower than the experimental values. Therefore, we conclude that there should be an additional heat transfer enhancement mechanism involved in the viscoelastic fluid such as temperature-dependence.
Python Script를 이용한 지능형 토크컨버터 유동해석 제어 프로그램 개발
박재환(Jaehwan Park),신세현(Sehyun Shin),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The present article described a development of a control program of flow analysis for torque converter. Developing a new torque converter with numerical analysis requires labor-intensive processes such as grid generation and redesign. These processes have been a major difficulty in reducing the development time. Thus, we developed a control program adopting a python scripting function, which can delete the repeated process in preparing CFD analysis including grid generation, applying boundary condition, etc. In the present study, the control script program was successfully applied to the analysis for automotive torque converters, which replace the repeated labor-intensive processes with a quick and simple GUI-based process. With the present python scripting control program, one can restart a new computational flow analysis after revised geometry data within 5 min, which took at least 5 hrs.
최성호(Sungho Choi),신세현(Sehyun Shin) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The present study investigated the effect of the transversal vibration on the flow characteristics for non-<br/> Newtonian fluids. The effect was tested by experiment and numerical analysis. For Newtonian fluids, both of<br/> experiment and numerical analysis results showed that mechanical vibration did not affect the flow rate. For<br/> non-Newtonian fluids, however, there was significant disagreement between experiment and numerical results.<br/> The numerical results showed a negligibly small effect of vibration on the flow rate whereas experimental<br/> results showed a significant flow rate increase associated with transversal vibration. The results implied that<br/> the increased flow rate was caused not only by imposed shear rates at the wall but also by the changes of<br/> rheological characteristics due to the transversal vibration.
토크컨버터의 편평비 변화에 따른 유동특성 및 성능 연구
이병철(Byungchul Lee),신세현(Sehyun Shin),김철(Cheol Kim),문수연(Suyeon Moon),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The changes of the torque ratio, input capacity factor, and internal flow characteristics of a torque converter with a variance in flatness ratios were numerically investigated. The present numerical analysis was performed for the full three-dimensional turbulent flows. The present results were in good agreement with experimental results. The present study showed that the torque ratio decreased and the input capacity factor increased as the flatness ratio decreased. The increase of the input capacity factor resulted from the increase of volume flow rate since the flow area of a stator increased. The decrease of the torque ratio was due to the reduction of a stator torque caused by the decrease of angular momentum. The solidity of the stator became significantly smaller as the flatness ratio became smaller. The solidity played an important parameter in designing the torque converter with a narrow profile since the torque ratio was reduced as the solidity decreased.
Tomographic visualization of tissue compositional changes in human breast model
Yijie Yang(양이지에),Sehyun Shin(신세현),Megha Singh(메가싱) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Human breast is a soft tissue structure. The changes in the compositional variation especially at the onset stage of cancer could better be visualized by optical tomography, which depend on the refractive index variation compared to mammography. The latter technique depends on the variation of attenuation coefficient which could be an important parameter during the progression of the tumor. The objective of the present work is to simulate the optical tomographic procedure on breast tissue models. The breast model is made of goat fat tissues. In this the inclusions of tissues of varying optical parameters are inserted at different locations. The optical parameters of the inclusions are higher than that of fat tissues. Optical tomography reconstruction of breast phantom is carried out in parallel beam configuration. The tomographic images are further processed by various image processing procedures. The results show that the tissue compositional variation and size of the various tissues inserted into model are well resolved by this procedure.