• Korean Membrane Journal
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• 제8권1호
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• pp.13-20
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• 2006

The production of CO-free hydrogen streams for feeding PEM-Fuel Cells using catalytic zeolite membrane reactors was analysed by means of selective oxidation. Tubular FAU (Na-Y) zeolite membranes, prepared by a secondary growth method and Pt-loaded, were used in a flow-through MR configuration. The catalytic tests were carried out at $200^{\circ}C$ and at different pressures with a simulated dry reformate shifted gas mixture ($H_2$ ca. 60%, CO 1 %, plus $O_2,\;N_2,\;CO_2$). The operative $O_2/CO$ stoichiometric equivalent feed ratio was ${\lambda}= 2$. These catalytic tests, reducing the CO concentration down to $10{\sim}50$ ppm, verified the possibility of MR integration after using a low temperature water-gas shift unit of a fuel processor to convert hydrocarbons into hydrogen-rich gas.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2008년도 춘계학술발표대회
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• pp.508-511
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• 2008

In this paper, we propose software architecture for conveying contents-based OpenSound Control (OSC) packet from manipulation user interface to cooperative remote multi-robots. The Flash application is used as a controlling user interface and the physical prototyping of multi-robots were developed using physical prototyping toolkit.

• 한국포장학회지
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• 제12권1호
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• pp.63-73
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• 2006

한국의 시유 포장은 1937년 7월부터 현재 서울우유협동조합(그 당시 경성우유동업조합)이 1홉(hob : 180 ml, 0.048 standard gallon) 유리병에 지전(paper cap) 또는 콜크마개(cork cap)로 사용한 것이 최초였다. 그 이후(1945$\sim$1972)로 2홉 유리병 360 ml도 생산되었고 마개도 철전(iron cap)이나 plastic film을 씌운 뚜겅이 관모(egret, pappus)형태로 바뀌었다. 그 밖에 우유병이 부족하면 사이다병, 맥주병 등 유색유리용기가 사용되기도 하였다. 우유생산업체는 한국에서 서울우유협동조합만이 유일하게 있다가 1964년 3월 남양유업(주)이 창립되고, 1969년 현재 해태유업(그 당시 대한식품공사)이 설립, 1971년 5월 현재 매일유업(주)(그 당시 한국낙농유업) 등 여러 업체들이 점진적으로 설립되어 각 종의 낙농제품(dairy products, dairy manufactures)이 포장되어 생산되기 시작하였다. 그리고 1971년에 서울우유협동조합에서 처음으로 삼각형 폴리 에틸렌필름용기가 사용되었고 1972년에는 남양유업(주)의 종이용기인 Tetra pak 멸균팩을 수입하여 최초 사용하였다. 1974년경부터 사각형 폴리에틸렌필름포장과 플라스틱병 용기가 처음 선보였으며, 1977년에는 종이포장인 게이블톱 카튼팩(gable top carton pack)이 서주산업(주)에 의해 최초로 소개된 후 급격히 시장점유율이 확대되었고 용량에서도 180 ml에서 200 ml, 250 ml, 500 ml, 1,000 ml의 대형으로 서서히 바뀌었으며 그에 맞춰 소비량도 변화되었다. 그리고 파스퇴르 우유 490 ml의 포장을 1987년 9월에 국내 최초로 몸체는 고밀도 폴리에틸렌병(high density polyethylene bottle), 뚜껑은 저밀도 폴리에틸렌을 사용하였고 1992년 7월 남양유업은 다우(DOW)란 상품명으로 polyethylene병에 235g, 450g, 930g을 넣어 4각형 형태로는 최초 시판하였다.

• Journal of Plant Biology
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• 제16권1_2호
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• pp.6-11
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• 1973

The utilization of acetate by Dunaliella tertiolecta was examined, and the detections and assays of the enzymes of the tricarboxylic acid cycle and the glyoxylate pathway were described. Acetate could not be utilized as a sole carbon source for the growth. The carboxyl carbon of acetate was incorporated more rapidly into CO2 than the methyl carbon. It was identified that malate, succinate, citrate and etc., were accumulated whne [U-14C] acetate was supplied to the cell free homogenate. The following enzyme activities were measured; acetothiokinase, isocitrate dehydrogenase, fumarase, malate dehydrogenase and aconitase. Though isocitratase, malate synthetase, succinate dehydrogenase and oxoglutarate dehydrogenase could not be detected, 14C from succinate was easily contributed to CO2 and cell component. The evidence suggested that the glyoxylate pathway was not operative and showed that the TCA cycle was the all important pathway in the oxidation of acetate to CO2 in Dunaliella.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제24권2호
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• pp.53-68
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• 2017

The object of the present paper is to study generalized Z-recurrent manifolds. Some geometric properties of generalized Z-recurrent manifolds have been studied under certain curvature conditions. Finally, we give an example of a generalized Z-recurrent manifold.

• Bulletin of the Korean Chemical Society
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• 제32권10호
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• pp.3712-3719
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• 2011

Confined Pt and $CoFe_2O_4$ nanoparticles (NPs) in a mesoporous core/shell silica microsphere, Pt-$CoFe_2O_4$@meso-$SiO_2$, were prepared using a bi-functional linker molecule. A large number of Pt NPs in Pt-$CoFe_2O_4$@meso-$SiO_2$, ranging from 5 to 8 nm, are embedded into the shell and some of them are in close contact with $CoFe_2O_4$ NPs. The hydrogenation of cyclohexene over the Pt-$CoFe_2O_4$@meso-$SiO_2$ microsphere at $25^{\circ}C$ and 1 atm of $H_2$ yields cyclohexane as a major product. In addition, it gives oxygenated products. Control experiments with $^{18}O$-labelled water and acetone suggest that surface-bound oxygen atoms in $CoFe_2O_4$ are associated with the formation of the oxygenated products. This oxidation reaction is operative only if $CoFe_2O_4$ and Pt NPs are in close contact. The Pt-$CoFe_2O_4$@meso-$SiO_2$ catalyst is separated simply by a magnet, which can be re-used without affecting the catalytic efficiency.

• 디지털융복합연구
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• 제15권1호
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• pp.191-198
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• 2017

본 연구는 문화예술협동조합 이용자 관람만족이 조직역량에 따른 재이용의도에 미치는 영향에 관한 연구로, 최근 들어 문화예술관련 협동조합이 증가하고 있으나 활성화를 위한 전략적 대안이 부족하여 본 연구를 시작하게 되었다, 이를 위해 문화예술협동조합 관련 이론적 고찰을 통해 연구모형 및 연구가설을 설정하여 문화예술 사용자를 중심으로 실증분석을 한 결과 첫째, 문화예술협동조합 이용자 관람 만족은 재이용의도에 영향을 미치는 것으로 확인되었다. 둘째, 문화예술협동조합 조직역량은 재이용의도에 영향을 미치는 것으로 확인되었고, 셋째, 문화예술협동조합 이용자 관람만족은 조직역량에 따라 재이용의도에 영향을 미치는 것으로 확인되었다. 따라서 본 연구는 문화예술협동조합 이용자 관람만족과 재이용의도에 관한 영향을 확인하였고, 조직역량도 재이용의도에 영향이 있는 것을 확인하여 이론적 시사점을 제공하는데 의의가 있다.

• Nutrition Research and Practice
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• 제5권4호
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• pp.308-312
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• 2011

This was a prospective cohort study of 976 infants from birth to 12 months of age. Infants were fed breast milk, goat infant formula, cow infant formula, or a combination of formula and breast milk during the first 4 months of age. Data on type of milk feeding and infant growth (weight and height) were collected at birth and at 4, 8, and 12 months during routine clinical assessment. The number and consistency of bowel motions per day were recorded based on observational data supplied by the mothers. Infants fed breast milk or goat or cow infant formula during the first 4 months displayed similar growth outcomes. More of the infants fed cow infant formula had fewer and more well-formed bowel motions compared with breast-fed infants. The stool characteristics of infants fed goat formula resembled those of infants fed breast milk.

• 생체재료학회지
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• 제22권4호
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• pp.346-351
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• 2018

Background: Carbonate apatite ($CO_3Ap$) and silica-calcium phosphate composite (SCPC) are bone substitutes with good prospect for dental application. SCPC creates a hydroxyapatite surface layer and stimulate bone cell function while, $CO_3Ap$ induce apatite crystal formation with good adaptation providing good seal between cement and the bone. Together, these materials will add favorable properties as a pulp capping material to stimulate mineral barrier and maintain pulp vitality. The aim of this study is to investigate modification of $CO_3Ap$ cement combined with SCPC, later term as $CO_3Ap-SCPC$ cement (CAS) in means of its chemical (Calcium release) and physical properties (setting time, DTS and pH value). Methods: The study consist of three groups; group 1 (100% calcium hydroxide, group 2 $CO_3Ap$ (60% DCPA: 40% vaterite, and group 3 CAS (60% DCPA: 20% vaterite: 20% SCPC. Distilled water was employed as a solution for group 1, and $0.2mol/L\;Na_3PO_4$ used for group 2 and group 3. Samples were evaluated with respect to important properties for pulp capping application such as pH, setting time, mechanical strength and calcium release evaluation. Results: The fastest setting time was in $CO_3Ap$ cement group without SCPC, while the addition of 20% SCPC slightly increase the pH value but did not improved the cement mechanical strength, however, the mechanical strength of both $CO_3Ap$ groups were significantly higher than calcium hydroxide. All three groups released calcium ions and had alkaline pH. Highest pH level, as well as calcium released level, was in the control group. Conclusion: The CAS cement had good mechanical and acceptable chemical properties for pulp capping application compared to calcium hydroxide as a gold standard. However, improvements and in vivo studies are to be carried out with the further development of this material.

• 한국수의병리학회지
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• 제7권1호
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• pp.27-41
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• 2003

The purpose of this study was to evaluate the effect of a subsequent infection of porcine reproductive and respiratory syndrome(PRRS) virus to pigs with A. pleuropneumonia in pigs. Twenty three 7-weeks-old commercial pigs were infected with PRRS virus and/or A. pleuropneumoniae serotype 5 intratracheally. Feed conversion, clincal signs, gross and histopathological lesions and immunohistochemical findings were examined. 1. Feed conversion ratio in dual-infected pigs with PRRS virus and A. pleuropneumoniae were higher than that of single- infected pigs with PRRS virus or A. pleuropneumoniae. 2. Dual-infected pigs with PRRS virus followed by A. pleuropneumoniae showed more severe clinical signs and gross, histopathological and immunohistochemical pulmonary lesions. The results indicated that dual infections with PRRS virus and A. pleuropneumoniae caused more severe respiratory lesions and growth retardation in pigs than single infection with PRRS virus or A. pleuropneumoniae.