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김동환,황차원,김남진,임상혁,구동건,김태희,차재민,류봉기,Kim, Dong-Hwan,Hwang, Cha-Won,Kim, Nam-Jin,Im, Sang-Hyeok,Gwoo, Dong-Gun,Kim, Tae-Hee,Cha, Jae-Min,Ryu, Bong-Ki 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.1
The investigation is directed to lead free (Pb-free) frits that can be used for organic light emitting diode, plasma display screen devices and other sealing materials. $P_2O_5$-SnO system glasses have been prepared for Pb-free low temperature glass frit. Structure and properties of the glasses with the composition SnO-$xB_2O_3-(60-x)P_2O_5$ (x=0, 5, 10, 15, 20, 25, 30, 35, 40 mol%) were characterized by infrared spectra (IR), X-ray diffraction(XRD), Density, Molar volume, Thermo mechanical analysis(TMA) and weight loss after immersion test. Glass transition temperature($T_g$), dilatometric softening temperature($T_d$) and chemical durability increased, and coefficient of thermal expansion($\alpha$) decrease with the substitution of $B_2O_3$ for $P_2O_5$ in the range of 0~25 mol%.
나종회,황순자,이상홍,김봉기,김문현 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.1
Recent studies in 3-D object recognition paradigms utilize extensively depth data - obtained by a laser range finder system. In this paper, we present the results of the simulation software development to model a typical range finder system. The gometric shapes and locations of each object, the relative position and orientation of a laser projector coordinate system and that of a camera coordinate system to the world coordinate system and projector rotation angular speed are given as input parameters to the simulator. To reduce the computational time, projector beam limits are automatically calculated from the given object arrangement. In addtion, we develop an algorithm to get the depth data despite of occlusion among objects. We show the experimental results with several objects of simple shapes.