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저 해상도급(QVGA) 영상에서 에지밀도를 이용한 자동차 번호판 인식(LPR) 알고리즘
김수종(Su Jong Kim),김민석(Min Seok Kim),김영철(Young Chol Kim) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10
본 논문에서는 자동차 번호인식기술 분야에서 핵심기술인 자동차 번호판인식((LPR),License Plate Recognition) 알고리즘에 대해서 제안한다. 본 논문에 기재된 알고리즘은 산업시스템에 바로 적용할 수 있도록 알고리즘 구현하였고 실험결과를 취득하였다. 또한 본 논문의 알고리즘은 임베디드(Embedded)시스템에 적용할 수 있도록 저-해상도(QVGA)급 영상이 미지에서 번호판 인식을 할 수 있도록 설계하였다. LPR알고리즘의 가장 핵심적인 부분은 두 가지로 나누어진다. 첫 번째는 번호판을 인식하기 위한 영상이미지 전처리 과정이고 두 번째는 번호판 내부에 존재하는 숫자와 문자의 수직, 수평 에지밀도 분포도를 추출해 내는 알고리즘이다. 신-번호판, 구-번호판, 영업용번호판의 영상이미지에 본 논문의 알고리즘을 적용해본 결과 96[%]정도의 번호판 인식률을 확인하였다.
폴리머 매트릭스를 전구체로 사용한 SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> 축광성 형광체의 합성 및 형광 특성
김수종,권혁실,Kim, Soo-Jong,Kwon, Hyuk-Sil 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.8
[ $SrAl_2O_4:Eu^{2+},\;Dy^{3+}$ ] phosphor was synthesized using the impregnation method, and its photoluminescence and long-afterglow properties were investigated, A mixture of $Sr(NO_3)_2,\;Al(NO_3)_2\;9H_2O,\;EuCl_3\;6H_2O,\;DyCl_3\;6H_2O,\;NdCl_3\;6H_2O$ salts were dissolved in distilled water and impregnating into the polymer precursor. After drying, the impregnated mixture was heat treated at $900-1400^{\circ}C$ for 2h in a $N_2-H_2$ reduction atmosphere. The microstructure and crystal structure of the $SrAl_2O_4:Eu^{2+},\;Dy^{3+}$ powders were examined by scanning electron microscopy and X-ray diffraction, respectively. The photoluminescence spectra showed an excitation band along over wide wavelength of 250-450nm, and a broaden emission with a maxima peak at 360nm. In addition, the spectra also showed a good long after glow that decayed over a 1000sec period after 10 min excitation illumination.
하이브리드 로켓에서의 고체연료의 국부 후퇴율에 관한 연구
김수종,이정표,김기훈,조정태,김학철,우경진,문희장,성홍계,김진곤,Kim, Soojong,Lee, Jungpyo,Kim, Gihun,Cho, Jungtae,Kim, Hakchul,Woo, Kyoungjin,Moon, Heejang,Sung, Hong-Gye,Kim, Jin-Kon 항공우주시스템공학회 2008 항공우주시스템공학회지 Vol.2 No.4
In generally, the regression rate was expressed with average value and oxidizer mass flux in hybrid propulsion system. This can not represent the local value of regression rate along with oxidizer flow direction. In this study, experimental studies were performed with Separation method and Cutting method for measure local regression rate. In axial injection, the local regression rate decreases rapidly with axial location near entrance and increases with axial direction from the leading edge and the empirical formula for local regression rate with function of oxidizer mass flux and location was derived. Swirl injection regression rate has higher value at the leading edge of the fuel and comparatively uniform regression rate at the downstream. Overall regression rate of swirl injection is higher increased about 54 % than regression rate of axial injection.
김수종,한정화,심재호,Kim, Soo-Jong,Han, Cheong-Hwa,Shim, Jae-Ho 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.6
Nano-sized titanium oxide powders were synthesized by a polymer matrix technique using pulp and Titanium tetraisopropoxide (TTIP) as starting materials. The synthesized powders were characterized by XRD and FE-SEM. The particle size of the powders was controlled by preparation conditions, such as heat treatment temperature and time. After investigating various drying and heat treatment conditions, 50-100 nm sized homogeneous titanium oxide particles were obtained by treating at $600^{\circ}C$ for 1 h. The crystallization and rapid growth of particles was accelerated by increasing heat treatment temperature and time. Anatase phase generated below $600^{\circ}C$ transformed to the rutile phase with increasing heat treatment temperature. Moreover, above $800^{\circ}C$, heat treatment time had a very large influence on particle growth, and changing the heating condition also had a large influence on crystal growth.