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박춘호(Choonho Park),이동희,김중경(Jung Kyung Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Monte Carlo simulation is a useful technique to analyze the motion of particles. We computed the mean square displacement (MSD) from the trajectories of moving particles and classified the modes of particle motion with MSD. We applied this technique to diffusion in porous medium. Our simulation showed a good agreement with the results from photobleaching experiment.
스마트폰 기반 Mobile SmartScope를 이용한 혈구 영상 분석
박춘호(Choonho Park),조명옥(Myoung-Ock Cho),이동희(Donghee Lee),김중경(Jung Kyung Kim) 한국가시화정보학회 2012 한국가시화정보학회지 Vol.10 No.2
High-performance smartphones, equipped with a digital camera and an application software, can render conventional bench-top laboratory instruments mobile at affordable costs. As the smartphone-based devices are portable and wireless, they have wide applications especially in providing point-of-care (POC) tests in resource-constrained areas. We developed a hand-held diagnostic system, Mobile SmartScope, which consists of a small optical unit integrated with a smartphone. The performance of the SmartScope was favorably compared with that of conventional light microscopy in detecting and quantifying red blood cells. We also evaluated the fluorescence detection limit of the SmartScope incorporated with a blue light-emitting diode and appropriate optical filters by using fluorescently labeled microbeads for intensity calibration.
입자추적기법과 광표백기법을 이용한 미세입자의 확산율 측정
이동희(Donghee Lee),박춘호(Choonho Park),이정훈(Jeonghoon Lee),김중경(Jung Kyung Kim) 한국가시화정보학회 2009 한국가시화정보학회 학술발표대회 논문집 Vol.2009 No.11
To measure the diffusion coefficients of biological macromolecules, we develop a microscope-based platform combining FRAP (Fluorescence Recovery After Photo-bleaching) and SPT (Single Particle Tracking) techniques. In the FRAP measurement, the region of interest with full of fluorescent microparticles is bleached by high intensity Ar-ion laser. Subsequently, fluorescence is recovered by diffusion of both bleached molecules and unbleached molecules. From the recovery curves of FRAP system, we can estimate the diffusion coefficient of fluorescent microparticles. Also, using SPT technique we evaluate the trajectories of each particles and calculate the diffusion coefficient of microparticles. We calculate the theoretical diffusion coefficient from Stokes-Einstein relation. A theoretical diffusion coefficient has the lowest value and a diffusion coefficient from FRAP has the largest value.
생체 다공성 매질에서 분자 확산 측정을 위한 영상 기반 형광 광표백 기법 개발
이동희(Donghee Lee),이정훈(Jeonghoon Lee),박춘호(Choonho Park),김중경(Jung Kyung Kim) 한국가시화정보학회 2009 한국가시화정보학회지 Vol.7 No.1
Fluorescence recovery after photobleaching (FRAP) has been widely used for the measurement of molecular diffusion in living cells and tissues. We developed an image-based FRAP (iFRAP) technique using a modified real-time microscope and a 488 ㎚ Ar-ion laser. A fractional intensity curve was obtained from the time-lapse images of fluorescence recovery in the bleached spot to determine the diffusion coefficient of fluorescently labeled macromolecules in porous medium. We validated iFRAP through experiments with agar gels (0.5% and 1.5% w/v) containing FITC-Dextrans (10, 70 and 500 kDa ㎿). Further validation was performed by a Monte Carlo approach, where we simulated the three-dimensional random walk of macromolecules in agar gel model. Diffusion coefficients were deduced from the mean square displacement curves and showed good agreements with those measured by iFRAP.