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Two Color Laser Induced Confocal Fluorescent Thermometry: Design and Experiments
심재술,황하영,이무연,이동연 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
Thermal measurements are very important in the precision field. Many methods for measuring temperature using contact and noncontactapproaches have been developed. Because of the limitations of contact method, the non-contact method was investigated. Wedeveloped a typical non-contact measurement system for detecting temperature in microchannel. The typical non-contact measurementmethod is based on Laser induced Fluorescence (LIF) that is affected by the measurement environment. In this study, a noble andfast environment insensitive thermometry, which minimizes the environmental and photo-bleaching effects and uses simultaneouslytwo fluorescent dyes and a confocal microscope, was developed and experimented. In the proposed thermometry system, the two PMTs(photo multiplier tube) detectors as a photo sensor are used to remove the geometric mapping process which is due to the imagesof a target acquired simultaneously with two CCD cameras in the conventional two color LIF technique.
Study for an effect of LiNO3 on polysulfide multistep reaction in Li/S battery
심재술,고태조,유기수 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Lithium nitrate (LiNO3) has been reported as a novel additive to improve the cycling performance of Li/Sbatteries because LiNO3 suppresses the polysulfide shuttling problem. However, several studies indicatethat LiNO3 instead decreases the battery performance due to the formation of irreversible products at thecathode. In this study, we investigated the role of LiNO3 in irreversible product formation. To elucidate theeffect of LiNO3, electrolytes with an excess concentration of LiNO3 were employed in the Li/S cell fordischarge and cyclic voltammetry tests. In the discharge test, a distortion of the discharge profile near theend of the discharge was clearly observed for the Li/S battery using a 0.8 M LiNO3 electrolyte. The thirdplateau (distortion) representing the irreversible reaction was significantly more pronounced when apoor cathode that was not subjected to heat-treatment was used. In addition, cyclic voltammetry testsshowed an extra cathodic peak at 1.5 V corresponding to the irreversible reaction. It was confirmed thatthe irreversible product can be partially recovered to high-order polysulfides and elemental S8 byapplying a potential of over 2.9 V. Finally, to provide a more detailed explanation, we carried out acomputational simulation of the irreversible reaction. The simulation indicated that the reaction wasrelated to the formation of crystallized lithium sulfide, and the simulation results successfullyreproduced the third plateau (distortion) in the discharge profile.
Parallel implementation of finite volume based method for isoelectric focusing
심재술,Prashanta Dutta,Cornelius F. Ivory 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.12
A message passing interface (MPI) based parallel simulation algorithm is developed to simulate protein behavior in non-linear isoelectric focusing (IEF). The mathematical model of IEF is formulated based on mass conservation, charge conservation, ionic dissociation-association relations of amphoteric molecules and the electroneutrality condition. First, the concept of parallelism is described for isoelectric focusing, and the isoelectric focusing model is implemented for 96 components: 94 ampholytes and 2 proteins. The parallelisms were implemented for two equations (mass conservation equation and electroneutrality equation). The CPU times are presented according to the increase of the number of processors (1, 2, 4 and 8 nodes). The maximum reduction of CPU time was achieved when four CPUs were employed, regardless of the input components in isoelectric focusing. The speed enhancement was defined for comparison of parallel efficiency. Computational speed was enhanced by maximum of 2.46 times when four CPUs were used with 96 components in isoelectric focusing.
어레이 구조를 이용한 MPEG-2 비디오 인코더용 움직임 예측기 설계
심재술,박재현,주락현,김영민 대한전자공학회 1997 電子工學會論文誌, C Vol.c34 No.7
In this paper, we designed a motion estimator for MPEG-2 video coder using VHDL. Motion estimation is indispensable for encoding MPEG 2 video. Motion estimation takes over 50% computation power of video encoding 37 frames per second and is suitable for real-time processing. The number of data accesses for computation is fewer than 2 times compared with that of old one. This makes slower memory module available. We minimize input pins to migrate input data through PEs. This processor can compute various motio estimation modes at one calculation that is supported by MPEG-2 video standard. Also independent control architecture makes this processor a single processor or a sub module in amultimedia chip.
서버 클라이언트 기반의 실시간 마이크로칩 형광 이미지 분석 시스템 개발
조미경,심재술,Cho, Migyung,Shim, Jaesool 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.5
In the field of clinical medicine and research, the analysis of such as protein and DNA at the molecular level and even at the cell level are necessary for disease diagnosis and treatment. In many cases, a real time image of samples is needed for the accurate analysis and manipulation of samples since experimental samples are degenerated with time. In this research, a three-dimensional fluorescence microscope device was developed for taking images of protein and DNA inside a single cell and the server-client based image analysis system was made for an integrated management of the real-time images taken from the microscope device. The system consists of a fluorescent measurement device, the associated software and a client program on smartphone. The developed system allows doctors or experimental managers to receive and look at the real-time experimental images taken from the samples of patients anywhere in the emergency, to analyze results and to instantly diagnose the disease and to transfer the results to the patients. As a result, the system is able to be utilized in the implementation of ubiquitous health as well. 임상 의료 분야에서 질병 진단 및 치료를 위해서는 분자 수준(프로틴, DNA 등)의 크기 뿐만 아니라, 세포 수준에 대한 분석이 필요하다. 많은 경우 실험 샘플이 시간에 따라 변질되기 때문에 정확한 분석을 위해서는 빠른 분석과 실시간 데이터가 필요하다. 본 연구에서는 나노 마이크로 크기의 세포내 단백질이나 DNA의 변화 과정 등을 촬영할 수 있는 3차원 형광 관측 장치를 제작하고 이로부터 얻은 형광 이미지를 실시간 통합 관리 및 분석하기 위한 서버 클라이언트 기반의 형광 이미지 분석 시스템을 구축하였다. 시스템은 형광 관측 장치와 소프트웨어 그리고 형광 이미지를 실시간으로 분석할 수 있는 모바일 프로그램으로 구성된다. 개발된 시스템은 의료인이 시공간의 제약 없이 응급환자의 샘플에서 획득한 형광이미지를 실시간으로 전송받아 분석 및 진단을 내릴 수 있도록 해 주므로 유비쿼터스 헬스 구현에 활용할 수 있다.