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모세관 힘으로 구동되는 단백질칩용 폴리머 미세유체제어소자
고종수,윤현철 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.12
This paper describes the design, fabrication, and test of a PDMS and PMMA -laminated microfluidic device for an immunosensing biochip. A PDMS top substrate molded by polymer casting and a PMMA bottom substrate fabricated by hot embossing are bonded with pressing force and hermetically sealed. Two inlet ports and an air vent are opened through the PDMS substrate, while Au electrodes for electrochemical detection are patterned onto the PMMA substrate. The analyte sample is loaded from the sample inlet port to the detection chamber by capillary force, without any intervening forces. For this and to control the time duration of sample fluid in each compartment of the device, including the inlet port, reaction barrier, reaction chamber, flow-delay neck, and the detection chamber, the fluid conduit has been designed using varying geometry. Especially, the fluid path has been designed so that the sample flow stops after filling the detection chamber to allow sufficient time for biochemical reaction and subsequent washing steps. The washing solution is supplied through the buffer solution inlet port by an external syringe pump. As a model system for a configurable microfluidic device, the functionalization of ferritin (antigen) to the sensing monolayer and their biospecific interaction with anti-ferritin antiserum has been investigated. An electrochemical detection method for immunosensing by biocatalyzed has been developed and applied for signal registration.
에어백용 압저항형 외팔보 미소 가속도계의 설계, 제작 및 시험
고종수,조영호,곽병만,박관흠,Ko, Jong-Soo,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 self-diagnostic, air-damped, piezoresitive, cantilever-beam microaccelerometer has been designed, fabricated and tested for applications to automotive electronic airbag systems. A skew-symmetric proof-mass has been designed for self-diagnostic capability and zero transverse sensitivity. Two kinds of multi-step anisotropic etching processes are developed for beam thickness control and fillet-rounding formation, UV-curing paste has been used for sillicon-to-glass bounding. The resonant frequency of 2.07kHz has been measured from the fabricated devices. The sensitivity of 195 $\mu{V}$/g is obtained with a nonlinearity of 4% over $\pm$50g ranges. Flat amplitude response and frequency-proportional phase response have been obserbed, It is shown that the design and fabricaiton methods developed in the present study yield a simple, practical and effective mean for improving the performance, reliability as well as the reproducibility of the accelerometers.
PZT 순수박막과 PZT/PT 교차박막의 적외선 감지 특성 비교
고종수,곽병만,Ko, Jong-Soo,Kwak, Byung-Man 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
To improve the performance of the PZT thin flms, each PZT and PT layer was alternately deposited on a Pt/Ti/Si$_3$N$_4$/SiO$_2$/Si substrate by a modified sol-gel solid precursor technique. For comparison, PZT thin films were also prepared with an identical method under the same conditions. XRD measurement revealed that the diffraction pattern of the multilayer film was due to the superimposition of the PZT and PT patterns. At 1㎑, a dielectric constant of 389 and 558, a dielectric loss of 1.2% and 1.1% were obtained for the PZT/PT and PZT thin films, respectively. If we consider the PT dielectric constant to be 260, it is clear that the dielectric constant of alternately deposited PZT/PT thin films was well adjusted. The PZT/PT thin film showed a low dielectric constant and a similar dielectric loss compared with those of the PZT film. The figures of merit on detectivity for the PZT/PT and PZT thin films were 20.3$\times$10$\^$-6/㎩$\^$-$\sfrac{1}{2}$/, and 18.7$\times$10$\^$-6/㎩$\^$-$\sfrac{1}{2}$/, and the figures of merit on voltage response were 0.038㎡/C and 0.028 ㎡/C, respectively. The high figures of merit for the PZT/PT film were ascribed to its relatively low dielectric constant when compared to the PZT thin films.
고종수(Jong Soo Ko),김규현(Kyu Hyun Kim),이창열(Chang Yeol Lee),조영호(Young-Ho Cho),이귀로(Kwyro Lee),곽병만(Byung Man Kwak),박관흠(Kwanhum Park) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
A silicon microaccelerometer is designed and fabricated using silicon epitaxial layers for automotive electronic airbag applications. A cantilever structure is chosen for high sensitivity and a piezoresistive detection method is adopted for circuit simplicity and low cost. An optimum design is used to find optimum microstructure sizes for maximum sensitivity subject to performance requirements and design constraints on natural frequency, damping ratio, maximum allowable stress and microfabrication limitations. The microaccelerometer is fabricated by micromachining processing steps, composed of material-selective and orientation-dependent chemical etching techniques. Fabricated prototype shows a sensitivity of 88.6μV/g within a resonant frequency of 1.75kHz. Estimated performance of the microaccelerometer is compared with measured one. Discrepancy between the theoretical values and the experimental values is discussed together with possible sources of the errors.<br/>