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자기영동을 이용한 자성입자 분리 마이크로 칩 제작 및 성능평가
고정상,Go, Jeung-Sang 대한기계학회 2007 大韓機械學會論文集B Vol.31 No.4
We developed a microfluidic platform able to control the trap and release of magnetic beads used for separation of a specific biomolecules. The magnetic beads can be trapped and released conditionally by controlling the difference between the Stokes force induced by the fluid flow and magnetic force resulting from a permanent magnet. The permanent magnet of CoNiP alloy is electroplated. It is characterized to have the 1369 Oe of coercivity, 1762 Gauss of remanence, and 0.603MGOe of (BH)max. Through the experimental and numerical investigation, the magnetic beads are trapped under the flow velocity of 17 ${\mu}m/s$ and are released perfectly above the velocity of 174 ${\mu}m/s$.
스냅스루 좌굴을 이용한 미소스위치의 설계, 제작 및 실험
고정상,조영호,곽병만,박관흠,Go, Jeung-Sang,Cho, Young-Ho,Kwak, Byung-Man,Park, Kwan-Hum 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.2
A snapping-beam microswitch has been designed, fabricated and tested. From a design analysis, necessary and sufficient conditions for a snap-through switching fouction have been derived for a clamped shallow beam. The necessary condition has resulted in a geometric relation, in which the ratio of beam thickness to initial beam deflection plays a key role in the snapping ability. The sufficient condition for the snapping action has been obtained as a function of the inertia force due to applied acceleration, and the electrostatic force, adjustable by an inter-electrode voltage. For experimental investigations, a set of microbeams of silicon dioxide/$P^+$silicon bimorphs have been fabricated. Geometric size and mechanical behavior of each material film have been measured from on-chip test structures. Estimated and measured characteristics of the fabricated devices are compared.
신보성(Bo-sung Shin),박강수(Kang-su Park),박연경(Yeon-kyoung Bahk),고정상(Jeung-sang Go) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
It is well known that abrasive waterjet (AWJ) was developed a kind of high-density energy processing technologies. AWJ is used to obtain the better cutting quality of various materials such as metals, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However AWJ have still been some difficulties to improve the quality of thin workpiece. In this paper, we investigate the optimal microcutting conditions of AWJ, such as maximum pressure, cutting speed and standoff distance, of thin multi-layered materials. The experimental results show that AWJ have possibilities and potential to apply to the microcutting of thin multi-layered materials for IT industrial applications.
워터젯 노즐의 길이와 내부 나선 구조 유무에 따른 유체거동에 관한 전산해석
곽청렬(Cheong-Yeol Gwak),신보성(Bo-Sung Shin),고정상(Jeung-Sang Go),김문정(Moon-Jeong Kim),유찬주(Chan-Ju Yoo),윤단희(Dan-Hee Yun) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.1
It is well known that water jetting is now widely used in the advanced cutting processes of polymers, metals, glass, ceramics, and composite materials because of some advantages, such as heatless and non-contacting cutting different from the laser beam machining. In this paper, we proposed the simulation model of waterjet by lengths and the inner spiral structure of the nozzle. The simulation results show that the outlet velocity of the nozzle is faster than the inlet. Furthermore, we found rapid velocity reduction after passing through the outlet. The nozzle of diameter ϕ500 and length 70mm, shows the optimal fluid width and velocity distribution. Also, the nozzle with inner spiral structure shows a Gaussian distribution of velocity and this model is almost twice as fast as the model without spiral structure, within the effective standoff distance (2.5 mm). In the future, when inserting abrasive material into the waterjet, we plan to analyze the fluid flow and the particle behavior through a simulation model.
정은호(Eun Ho Jeong),김일(Il Kim),고정상(Jeung Sang Go),김경천(Kyung Chun Kim) 한국가시화정보학회 2006 한국가시화정보학회지 Vol.4 No.2
The functional spherical microcapsules were produced through the innovative conjunction of the well-defined amphiphilic block copolymer and the stable droplet phase flow in the micro chemical plant. The microcapsules were formed to have hollow inner cavity and outer surface wall with nano-pores. To examine the potential of encapsulating foreign biochemical molecules, Congo-red dye was loaded into the microcapsule. The release performance in the specific surroundings such as temperature, pH and time was evaluated quantitatively.
ABS 열성형을 위한 유변학적 측정 및 수치 시뮬레이션
차제명(Jemyung Cha),송형용(Hyeong Yong Song),현규(Kyu Hyun),고정상(Jeung Sang Go) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
This work focused on rheological measurements of polymer material and numerical simulations of thermoforming process. Two rheological experiments were carried out to measure the viscoelastic properties of the acrylonitrilebutadiene-styrene (ABS) sheet using by a strain-controlled rotational rheometer. Small amplitude oscillatory shear (SAOS) experiments were performed over a wide temperature and frequency range. A master curves of storage and loss modulus of the ABS sheet were generated, discrete relaxation spectra and WLF parameters were obtained. From the uniaxial extensional experiments, time-dependent extensional viscosity was measured at several strain rates and temperatures. The damping function in the Wagner constitutive model was evaluated by using an optimization method. Numerical simulations of thermoforming process were conducted, and the numerical results of the thermoformed sheet were compared with the commercial thermoformed products.
곡면 유리 표면 위에서 박막 측온저항체 온도센서 어레이 제작 및 성능 평가
안철희(Chul Hee Ahn),김형훈(Hyoung Hoon Kim),박상후(Sang Hu Park),손창민(Changmin Son),고정상(Jeung Sang Go) 한국가시화정보학회 2011 한국가시화정보학회지 Vol.9 No.2
This paper presents a novel direct fabrication method of the thin metal film RTD temperature sensor array on an arbitrary curved surface by using MEMS technology to measure a distributed temperature field up to 300 ℃ without disturhing a fluid flow. In order to overcome the difficulty in the three dimensional photography or sensor patterning, the UV pre-irradiated photosensitive dry film resist technology has been developed newly. This method was applied to the fabrication of the temperature sensor array on a glass tube, which is arranged parallel and transverse to a main flow. Gold was used as a temperature sensing material. The resistance change was measured in a thermally controlled oven by increasing the environmental temperature. The linear increase in resistance change and a constant slope were obtained. Also, the sensitivity of each RTD temperature sensor was evaluated.
마이크로 유체 원심분리기의 챔버 크기에 따른 회전 유동 가시화
전형진(Hyeong Jin Jeon),권봉현(Bong Hyun Kwon),김대일(Dae Il Kim),고정상(Jeung Sang Go) 한국가시화정보학회 2012 한국가시화정보학회지 Vol.10 No.3
This paper introduces a new parameter to design the 2×2 microfluidic centrifuge with single flow rotation positioned at the center of microchamber. The dimensional centrifugal acceleration momentum flux which is defined as the interfacial momentum flux divided by distance from the center of the chamber explains the flow rotation and its threshold provides a reference to expect single flow rotation. Through the numerical and experimental visualization of the flow rotation, the number and position of flow rotation in the 2×2 microfluidic centrifuge were examined. At a channel width of 50 μm and chamber width of 250 μm, single flow rotation was obtained over at a Reynolds number of 300, while at a channel width of 100 μm and chamber width of 500 μm, single flow rotation did not appear. The numerical analysis showed that the threshold centrifugal acceleration momentum flux to obtain single flow rotation was 3500 kg/m·s<SUP>2</SUP>.