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박용갑,장병국 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.3
In order to evaluate the oxidation behavior of $\beta$-Sialon, $\beta$-Sialon ceramics was prepared from Si3N4, Al2O3, AlN and Y2O3 system. The specimens were oxidized in an oxygen atmosphere at 1, 20$0^{\circ}C$ for 9days. Oxidation behavior was evaluated by weight gain oxidation process, surface roughness. Microscopy, EDX and X-ray diffraction analysis were also used for the evaluation. The weight and surface roughness ofoxidized specimens were increased with increasing the oxidation time. Oxidized products were mullite, $\alpha$-cristobalite, yttrium aluminum oxide and yttrium silicate oxide.
주문갑(Moon-Gab Joo),박상홍(Sang-Hong Park),장병용(Byoung-Yong Chang),류지열(Jee-Youl Ryu) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.1
This paper proposes a high-lumen low-power pattern generation system with operation software for 3D scanning. The proposed system occupies a core block of the 3D scanner to generate pattern-structured white light using a light engine and a DMD(Digital Micro-mirror Device) driver board. The system also has a window resolution of 912×1140 and a pattern-structured light source. Compared to recently reported results, the proposed system showed increased lumen by 40.83% and less than half power consumption at the focus range of 2m. This system could be applicable to 3D scanners, creating smart factory automation robot with regional industry.
AlN-SiO2-Al2O3계로부터 AlN-Polytypes의 제조
박용갑,장병국 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.1
In order to synthesize AlN-polytypes from AlN-SiO2-Al2O3 system, composition A (AlN/SiO2/Al2O3=1/0.3/0.05, mole ratio) and composition B(AlN-SiO2-Al2O3=1/0.2/0.05, mole ratio) were used. AlN-polytypes were produced by nitriding the mixture at 175$0^{\circ}C$~190$0^{\circ}C$ under N2 atmosphere. For lower reaction temperature, 15R phase was produced and in the case of higher reaction temperature, AlN phase was only produced. As each composition was heated at 185$0^{\circ}C$ in N2 atmosphere, produced main phases were 15R phase for composition A and 21R phase for composition B respectively. The fracture surfaces of produced reactants showed porous skeleton structure.
번식우에 대한 rBST투여가 포유기 송아지의 비육과 설사 예방에 미치는 영향
이경갑,류경표,이영재,정종태,김희석,김남중,장병선 한국임상수의학회 1999 한국임상수의학회지 Vol.16 No.2
This study was carried out to investigate weight gain and prevention of diarrhea in suckling calves which were injected with recombinant bovine somatopropin (rBST). A total of 101 breeding cows were assigned to the six groups according to the administered dosage and injected time, respectively. Groups T-1, T-3, T-4 and T-6 were injected starting 1 week before calving and groups T-2 and T-5 were injected on the calving day. The six groups were injected five times at two week intervals. Groups T-1 and T-2 were injected with 250mg composite rBST, Group T-3 was injected with 375 mg composite rBST. Groups T-4 and T-5 were injected with 500mg composite rBST, And group T-6 was injected with 500mg rBST-S. The control group was not injected with BST. The groups injected with 500 mg BrST had a lower rate of morbidity from diarrhea than the control group or the groups injected with 250 mg rBST (T-1 and T-2). Weight gain was higher in group T-4 than in the control group or groups T-1 and T-2. In Korean Native Cattle, the total weight gain was greater in group T-4 than in the control group (p<0.05). In crossbred cows, total weight gain was the highest in group T-4, and the total weight gain rate was greater than in group T-4 and the control group (p<0.05). The results of the hematological values showed that injections of rBST did not affect the level of the RBC, TP and BUN in the breeding cows at 9 weeks after postpartum or the neonatal calves. The results of this study indicate that injecting breeding cows with 500 mg rBST before calving would be effective in the preventing of diarrhea and in increasing weight gain of calves from birth to weaning.
안드로이드 스마트폰 기반 Smart pH Reader 개발
김민지,장병용,주문갑 대한임베디드공학회 2013 대한임베디드공학회논문지 Vol.8 No.4
In this paper, we propose an implementation of pH reader on Android smart phone by using Eclipse and SDK. After taking a picture of pH spectrum and tested litmus paper at the same time, we save the picture. From the picture, reference values in RGB and YUB of all pH color in the spectrum are obtained and then those of a chosen point by user in the litmus paper are to be compared with. The distances between the reference colors and the litmus paper's color are measured by Euclidean distance in RGB or YUB coordinate. The nearest two pH values are taken to find the weighted average of the result. Series of test show the proposed scheme is feasible and has performance within 10% error.