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국내 외국인근로자의 여권 위변조 방지 개발에 관한 연구
윤영빈 ( Yeong-bin Yoon ),김명우 ( Myoung-woo Kim ),이아현 ( A-hyeon Lee ),한원희 ( Won-hee Han ),김민영 ( Min-young Kim ) 한국정보처리학회 2023 한국정보처리학회 학술대회논문집 Vol.30 No.2
본 논문은 외국인 근로자의 여권 위변조를 탐지하기 위해 MRZ 코드와 발광 데이터를 활용하는 방법을 제안하고 구현한 것이다. 이 기술은 외국인 근로자의 보호와 국내 안보 강화, 금융 거래의 안전성 향상을 지원하며, 웹 기반 인터페이스를 통해 실시간 판별과 사용자 편의성을 제공한다. 이로써 여권 위변조로 인한 잠재적인 위험을 예방하고 국내 여행 및 비즈니스 환경을 향상시킬 수 있다.
김영한,윤영빈,정인석,Kim, Young-Han,Yoon, Young-Bin,Jeung, In-Seuk 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.4
PIV(Particle Image Velocimetry) is a recently developed technique for visualizing the fluid velocity fields. Because it has several advantages over the LDV(Laser Doppler Velocimetry), it became one of the most popular diagnostic tools in spite of its short history. However, its application to combustion is restricted by some problems such as flame illumination, scattered light refraction, particle density variation due to heat release, the combined effect of abrupt change in particle density and fluid velocity on flame contour, and thermophoresis which is particle lagging due to temperature gradient. These problems are expected to be originated from the non-continuous characteristics of flames and the limitations of particle dynamics. In the present study, these problems were considered for the visualization of the instantaneous coaxial hydrogen diffusion flame. And the instantaneous flame contour was detected using particle density difference. The visualized diffusion flame velocity field shows its turbulent and meandering nature. It was also observed that the flame is located inside the outer shear layer and flame geometry is largely influenced by the vorticity.
준충류 근사를 이용한 수소-공기 비예혼합화염의 질소산화물 생성예측
김성룡,정인석,윤영빈,Kim, Seong-Lyong,Jeung, In-Seuck,Yoon, Young-Bin 한국연소학회 1999 한국연소학회지 Vol.4 No.1
A Numerical Analysis of NOx production in Hydrogen-Air flame is performed using the quasi-laminar reaction modelling. As results, in low global strain rate region, $U_F/D_F\;{\leq}\;50,000$, the quasi-laminar reaction modelling reproduces the experimentally observed EINOx half power scaling that the ratio of EINOx and flame residence time, $L_f^3(D_F^2U_F)$, is proportional to the square root of global strain rate. Thus, it suggests that turbulence-chemistry interaction has a minor impact on the trend of NOx production in low global strain rate region. However, the quasi-laminar reaction modelling predicts the higher temperature and NOx than experimentally observed. This overprediction may be due to the lack of radiation and quasi-laminar reaction modelling.
이경진,정기훈,윤영빈,정경석,정인석,Lee, Kyung-Jin,Jung, Ki-Hoon,Yoon, Young-Bin,Jeong, Kyung-Seok,Jeung, In-Seuck 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.1
The characteristics of spray nozzle have been quantified with the measurement of fluorescence and Mie scattering images. To correct the attenuation of the incident light sheet, a sequential double-pass light sheet system and the geometrical averaging of two images was implemented. Quantitative mass flux distribution of spray was obtained from fluorescence image. 3-D image is reconstructed using 2-D radial images. Sauter mean diameter (SMD) distribution was determined using the ratio of fluorescence signal intensity and Mie scattering signal intensity and the values were quantified with PDP A data. The measurement of mass flux and SMD using planar imaging technique agee with PDP A data fairly well in the low density region. However, in dense region, there are significant errors caused by secondary scattering. It was found that the planar imaging technique provides many advantages over the point measurement technique, such as PDP A, and can be implemented for quantitative measurement, especially in low density region.
미립화 및 분무장치 2 : 기체 중심 전단 동축형 분사기의 리세스 변화에 따른 불안정
윤정수 ( Jung Soo Yoon ),백경엽 ( Kyong Yup Paik ),정재묵 ( Jae Mook Chung ),윤영빈 ( Young Bin Yoon ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
The instability characteristics of shear coaxial injectors are studied with various injection conditions, such as the pressure drop of liquid and gas phase, and recess ratio. When self-pulsation occurs, intense scream and mass flow rate oscillations are detected by the strong interaction between liquid and gas phase. In this research spray oscillation frequency and spray patterns are measured by laser diagnostics and indirect photography.
부상된 동축공기 수소 난류확산화염에서의 화염안정화 특성
오정석(Jeong-Seog Oh),김문기(Mun-ki Kim),윤영빈(Young-bin Yoon) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.4
수소제트와 동축공기를 사용한 본 연구에서, 난류확산화염의 화염안정성 특정을 실험적으로 수행하였다. 목적은 연료속도 증가에 따라 감소하는 부상화염길이의 경향을 보고하고, 부상 메커니즘을 포함한 화염구조를 분석하는 것이다. 수소연료는 100에서 300 ㎧ 사이에서 조절되었으며, 이때 동축공기는 16 ㎧ 고정되고, 주위류는 0.1 ㎧ 이하로 유지되었다. 유동장과 연소장 동시측정을 위하여, 두 대의 Nd:Yag 레이저와 CCD 카메라를 이용하여 PIV와 OH PLIF 기법이 사용되었다. 결론적으로 난류화염전파속도는 난류강도에 비례하였으며, 제트 레이놀즈수의 0.017승에 비례하였다. In this study of lifted hydrogen jet with coaxial air, we have experimentally studied the characteristics of stabilization point in turbulent diffusion flames. The objectives are to present the phenomenon of a liftoff height decreasing as increasing fuel velocity and to analyse the flame structure and behavior including liftoff mechanisms. The fuel jet exit velocity was changed from 100 up to 300 ㎧ and a coaxial air velocity was fixed at 16 ㎧ with a coflow air less than 0.1 ㎧. For the simultaneous measurement of velocity field and reaction zone, PIV and OH PLIF technique was used with two Nd:Yag lasers and CCD cameras. It has been suggested that the stabilization of lifted hydrogen diffusion flames was correlated with a turbulent intensity, S<SUB>t</SUB>~u′, and jet Reynolds number, S<SUB>t</SUB>~Re<SUB>jet</SUB><SUP>0.017</SUP>.