• International Journal of Vascular Biomedical Engineering
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• 제4권2호
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• pp.1-6
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• 2006

Microsystems create new opportunities for conventional cell analysis by combining microfluidics and flow cytometry. This article describes recent developments in conventional flow cytometers and related microfluidic flow cytometers to detect, analyze, and sort cells or particles. Flow cytometry strongly consisted of fluidics, optics and electronics requires a large space to equip various components, which are mostly the fluidic components such as compressor, fluid handling system. Adopting microfluidics into flow cytometry enables volume- and power-efficient, inexpensive and flexible analysis of particulate samples. In this paper, we review various efforts that take advantage of novel techniques to build microfluidic cell analysis systems with high-speed analytical capability. Highly integrated microfluidic cytometry shows great promise for basic biomedical and pharmaceutical research, and robust and portable point-of-care devices could be used in clinical settings.

• 한국기계가공학회지
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• 제11권2호
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• pp.13-19
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• 2012

Ultra Precision Machining Techniques, such as manufacturing Micro Lens Array(MLA), off-axis mirror, $F-{\theta}$ lens for laser printer, are achieved, based on technologies in consequence of development of modern high-precision machining mechanism. Above all, FTS(Fast Tool Servo) and STS(Slow Tool Servo) are more innovative technologies for reducing time and development costs. In this paper, it is described that MLA machining technique by FTS, off-axis mirror machining technique by STS, optics for observing space, and development of infrared aspheric lens for a thermal imaging microscope.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.559-560
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• 2006

Fiber optic connector, ferrule, is a device to connect and align fiber optics cable on fiber-optic communication system. In general $ZrO_2$ ceramic ferrule is manufactured by grinding process because the demands precision is very high. For the precision grinding machining, it is very important that structure of co-axial ferrule grinding system is optimized. In this paper, Structural analysis was performed to analyze bed and frame structure of co-axial grinding machine. Deformation and modal analysis for natural frequency was performed using ANSYS design space program to analyze structural characteristics. New improved model of bed and frame structure was proposed based on initial basic model. Therefore, we estimated the structural characteristics precision co-axial grinding machining system.

• 한국광학회지
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• 제2권1호
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• pp.36-49
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• 1991

The coherence properties of electromagnetic fields are reviewed, based on both the classical and quantum theories. The elementary concepts, employed frequently in the discussion of interference phenomena, are summarized. The well-known interference phenomena are described in terms of second-order coherences. The coherence theory in space-frequency domain is introduced and the coherent mode representation is presented. The generation and propagation of coherence of light are analysed and it is shown that the coherence of light is developed as light propagates. The quantum theory goes parallel with the classical theory, via the optical equivalence theorem. There are, however, certain nonclassical characteristics of light, which may not be easily understood in classical therms. These nonclassical phenomena are believed to originate from the particle aspects of light. The quantum effect on the interfernce phenomena is analysed and finally the outlook of the future research is briefly mentioned.

• 한국광학회지
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• 제8권1호
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• pp.42-46
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• 1997

단일 색소 분자가 공초점 현미경의 검출 영역을 통과하면서 방출하는 형광폭발신호를 수집하기 위해서 컴퓨터 인터페이싱 광자계수기를 제작하였다. 사용한 계수기 소자들에 의해서 결정되는 최대 계수 속도는 약 80 MHz이며, 486급 PC 컴퓨터와 BASIC으로 작성한 프로그램을 사용하였을 때 최소 bin-width는 약 25.mu.s이었다. 이 계수기를 사용하여 에틸렌글리콜 용액내에 있는 JA22 단일 분자의 형광폭발신호를 수집하였으며 그 특성을 간략하게 기술하였다. 이때 색소 분자의 농도는 약 1 * $10^{-11}$ mol/L이었다.

• Current Optics and Photonics
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• 제1권4호
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• pp.271-277
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• 2017

Based on the extended Huygens-Fresnel principle, the analytical propagation formulae for spectrally partially coherent Gaussian Schell-model pulsed (SPGSMP) beams propagating in turbulent atmosphere have been derived. The influences of the parameters for turbulent atmosphere and SPGSMP beams on the on-axis and off-axis spectral shift and degree of coherence for SPGSMP beams propagating in turbulent atmosphere have been analyzed, using numerical calculations. The obtained results have potential applications for SPGSMP beams in free-space optical communication and laser lidar.

• Journal of applied mathematics & informatics
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• 제11권1_2호
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• pp.1-57
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• 2003

Vector fields in three-space admit bundles of internal variables such as a Heisenberg algebra bundle. Information transmission along field lines of vector fields is described by a wave linked to the Schrodinger representation in the realm of time-frequency analysis. The preservation of local information causes geometric optics and a quantization scheme. A natural circle bundle models quantum information visualized by holographic methods. Features of this setting are applied to magnetic resonance imaging.

• 한국광학회지
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• 제12권6호
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• pp.460-462
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• 2001

밀봉재를 사용하는 적외선 렌즈 마운트를 분석하고, 3-5$\mu\textrm{m}$에서 작동하는 전방 관측 적외선 열상장비의 대물렌즈인 직경 117mm의 Si 렌즈 마운팅 설계에 적용하였다. 밀봉재료는 Dow Corning 사의 heat cure 타입인 577 primerless Silicone Adhesive(MIL-PRF-23586F)을 이용하였으며, 마운트 재질로는 Al 6061을 사웅하였다. 이론적으로 렌즈와 마운트간의 간격은 -40~+6$0^{\circ}C$의 적용 온도환경에 대하여 250$\mu\textrm{m}$ 이상이 되어야 함을 알 수 있었다.

• 한국광학회지
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• 제4권1호
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• pp.73-83
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• 1993

광굴절결정에 구형과 및 저현파형의 외부 전장을 인가할 때 유기되는 공간 전하장의 시간 종속 해를 해석적으로 유도하였다. B$i_{12}$Si$O_{20}$ 결정에 최대 7KV/cm (주파수<1KHz)의 전장을 가하면서 시간 종속적인 2광파 혼합의 이득 변화를 측정하고 이론치와 정량적으로 비교 분석하였다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1996년도 추계학술대회
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• pp.258-262
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• 1996

The physiological systems have nonlinear complex phenomena. Expecially, the flow of capillary blood vessel has a nonlinear dynamic system. Thus, this study analyzes nonlinear characteristics of the flow of capillary blood vessel in physiological systems using chaotic tools(phase space reconstruction, correlation dimension, largest lyapunov exponent). Experimental data have been acquired from examining 10 rabbits. The results of chaotic analysis showed a decreasing largest lyapunov exponent and correlation dimension according to increasement glocose index. And we also know the chaotic behavior.