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미세 유체장치 내에서 Poly(Ethylene Glycol)과 Dextran 용액의 상 형성 특성 연구
최주형,장우진,이상우,Choi, Joo-Hyung,Chang, Woo-Jin,Lee, Sang-Woo 대한의용생체공학회 2007 의공학회지 Vol.28 No.2
Fluidic conditions for the separation of phases were surveyed in a microfluidic aqueous two-phase extraction system. The infusion ratio between polyethylene glycol (PEG) and dextran solution defines the concentrations of each polymer in micro-channel, which determine the phase-separation. The appropriate ratio between PEG (M.W. 8000, 10%, w/v) and dextran T500 (M.W. 500000, 5%, w/v) in order to perform the separation of phases of both polymers was observed as changing the mixed ratio of both polymers. Based on the fluidic conditions, stable two-phase solutions were obtained within 4% to 8% and 3% to 1% of PEG and dextran, respectively. In addition, the characteristics of the two-phase were discussed. The separation technique studied in the paper can be applied for the implementation of a lab-on-a chip which can detect various biological entities such cells, bacterium, and virus in an integrated manner using built in a biosensor inside the chip.
유한요소법을 이용한 구동상태에 따른 타이어의 특성 분석
전도형(Do-Hyung Jeon),최주형(Joo-Hyung Choi),조진래(Jin-Rae Cho),김기운(Kee-Woon Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
This paper discusses the measurement of tire driving performance for 2 types of tire model. Tire is almost composed of rubber, and this is related with the bearing capacity of tire due to the external force. In this study, an explicit time integration method has been used to simulate steady state rolling along a straight path and over a cleat. And analysis for tire dynamic response rolling over a cleat is importnat to study automobile NVH properties. Besides, the evaluation of contact shear force is perfomed for steady state rolling and braking state. The results show that there are noticeable differences between 205/60R15 and 225/60R15 tire model.
전도형(Do-Hyung Jeon),최주형(Joo-Hyung Choi),조진래(Jin-Rae Cho),김기전(Gi-Jeon Kim),우종식(Jong-Shik Woo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
This study is concerned with the braking distance estimation using frictional energy rate. First, steady state rolling analysis is performed, and using this result, the braking distance is estimated. Dynamic rolling analysis during entire braking time period is impratical, so that this study divides the vehicle velocity by 10㎞/h to reduce the analysis time. The multiplication of the slip rate and the shear stress provides the frictional energy rate. Using frictional energy rate, total braking distance is estimated. In addition. ABS(Anti-lock Brake System) is considered, and two type of slip ratios are compared. One is 15% slip ratio for the ABS condition. and the other is 100% slip ratio which leads to the almost same braking distance as the elementary kinematic theory. A slip ratio is controlled by angular velocity in ABAQUS/Explicit. A 15% slip ratio gives the real vehicle's braking distance when the frictional energy occurred at disk pad is included. Disk pad's frictional energy rate is calculated by the theoretical approach,
전산해석을 이용한 잔여가스 처리용 압력용기의 구조 및 성능 평가
김한울(Han Ul Kim),최주형(Joo Hyung Choi),허태욱(Tae Uk Heo),김명환(Myoung Hwan Kim),황태규(Tae Gyu Hwang),공길영(Gil-Young Kong),이재훈(Jae-Hoon Lee) 한국해군과학기술학회 2020 Journal of the KNST Vol.3 No.1
A knock out drum is a type of pressure vessel, which is one of the facilities for the safe treatment of residual gas, and serves to pre-separate droplets and other particles from flowing into the gas exhaust/combustion system. Knockout drums are operated under high temperature and high pressure operating conditions, so it is essential to design a knockout drum that reflects these conditions. This study intends to propose a method for designing and evaluating a knockout drum that satisfies both structural stability and droplet removal performance. Accordingly, for the purpose of design with structural safety, FEM structural analysis and evaluation methods based on ASME code are presented. And to evaluate the droplet removal performance of knockout drum, a case of applying particle tracking method using CFD is presented.