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서인준,남기택,고태송 ( I . J . Suh,K . T . Nam,T . S . Koh ) 한국축산학회 1985 한국축산학회지 Vol.27 No.10
Utilizability of citrus pulp and it`s effect on cholesterol metabolism was studied in chicks. The neutral detergent fiber (NDF) and acid detergent fiber (ADF) contents were analysed in the experimental, materials and residues (cellulosics) of excreta from birds fed diets contained wheat bran, citrus pulp, acetone extracted (AE) citrus pulp and ultrasonically treated (UT) citrus pulp. Cholesterol deposition in carcass and steroids excretion in excreta of birds fed diets contained cellulose (cotton meal), wheat bran, citrus pulp, citrus pulp-AE and citrus pulp-UT were investigated. The contents of NDP and ADP of experimental materials generally were lower than those of the residues from excreta of buds fed diets containing experimental materials. It seemed to be originated from the decrease of cell contents of the materials in the residues by digestion in the digestive tract of the chicks. The digestibility of cell contents in wheat bran, citrus pulp and citrus pulp-UT reached to 60.9, 59.7 and 49.9io, respectively, which was low comparing to 75.5% in citrus pulp-AE. Carcass of buds contained 456-460㎎ of cholesterol in the initial stage of experimental feeding, while chicks fed cellulose, wheat bran, citrus pulp, citrus pulp-AE and citrus pulp-UT had diposited 45.5, 48.7, 46.4, 67.9 and 61.7㎎, respectively, per day during 10 days of experimental feeding. Thus birds fed citrus pulp-AE accumulated significantly more cholesterol compared with those of citrus pulp. When birds were fed with cellulose, citurs pulp-AE and citrus pulp-UT, cholesterol accumulation per metabolic body size (㎏^(0.75)) correlated negatively with steroids excretion per ㎏^(0.75) in excreta while those values in birds fed wheat bran and citrus pulp were shown different trend. Cholesterol deposition per ㎏^(0.75) of birds fed cellulose, citrus pulp-AE and citrus pulp-UT correlated positively with the retention of protein and lipids per ㎏^(0.75). Birds fed wheat bran and citrus pulp contained relatively constant values though the levels of protein and lipids were changed. It was supposed that the effect of acetone extracted and ultrasonically treated citrus pulp on the metabolism of cholesterol in chicks will be different with those of wheat bran and citrus pulp.
유기태양전지 응용을 위한 원자층 증착 방식 제작의 알루미늄이 도핑 된 ZnO의 전기적, 구조적 특징
서인준,류상욱 한국반도체디스플레이기술학회 2014 반도체디스플레이기술학회지 Vol.13 No.2
Transparent and conducting aluminum-doped ZnO electrodes were fabricated by atomic layer deposition methods. The electrode showed the lowest resistivity of 5.73x10-4 Ωcm at a 2.5% cyclic layer deposition ratio of Trimethyl-aluminum and Diethyl-zinc chemicals. The electrodes showed minimum resistivity when deposited at a temperature of 225 oC. The electrode also showed optical transmittance of about 92% at 300 nm. An organic solar cell made with a 300-nm-thick aluminum-doped ZnO electrode exhibited 2.0% power conversion efficiency.
비섬유탄수화물과 반추위분해단백질의 다른 비율이 In Vitro 발효와 젖소의 산유성적에 미치는 영향
서인준,이도형,이성훈,Seo, I.J.,Lee, D.H.,Lee, S.H. 한국축산학회 2005 한국축산학회지 Vol.47 No.4
본 연구는 비섬유탄수화물(NFC)과 반추위분 해단백질(RDP)을 젖소사료에 다양하게 배합하여 NFC : RDP의 비율을 3.5, 3.0 및 2.5로 다양하게 조정하였을 때, in vitro 발효성상 및 젖소의 산유성적에 미치는 영향을 조사하여 적정 NFC : RDP비율을 결정하고자 실시하였다. In vitro 발효시험은 반추위 cannulae가 장착된 Holstein 젖소로부터 반추위액을 얻어 3, 6, 9, 12시간 동 안 배양하였다. 반추위내 pH는 NFC비율이 증가함에 따라 유의한 영향을 받지 않았고, 암모 니아질소농도는 배양 6시간까지 처리군간에 유의한 차이가 나타나지 않았으나, 9시간과 12 시간에서는 NFC : RDP비율이 증가함에 따라 유의하게 감소하였다(P < 0.05). 휘발성지방산생산 량은 acetate 및 propionate농도가 발효 3시간에 NFC함량이 증가함에 따라 유의하게 증가하였 으나(P < 0.05), 나머지 시간대에서는 유의차가 나타나지 않았다. Valerate 및 A : P비율은 NFC : RDP비율에 의하여 영향을 받지 않았고, iso- acids 및 총 휘발성지방산은 전반적으로 NFC함 량이 증가함에 따라 유의하게 증가하였으며(P < 0.05), 3.0비율구가 가장 높은 값을 나타내었다(P < 0.01). 한편, 사양시험은 18 두의 착유우를 공시하여 처리구당 6 두씩 배치하여 총 24주간 실시하였 다. 건물 및 에너지섭취량은 NFC : RDP비율이 증가함에 따라 유의하게 증가하였고(P < 0.01), 섬 유소섭취량은 NFC : RDP비율이 감소함에 따라 직선적으로 증가하였다(P < 0.01). 산유량은 3.5(32.7 kg)비율구가 다른 처리구보다 유의하게 높았다(P < 0.05). 유지방율은 3.0(3.79 %) 및 2.5(3.79 %)비율구가 3.5(3.48 %)비율구보다 유의하 게 높았고(P < 0.05), 유지방생산량은 처리구간 에 차이가 나타나지 않았다. 유단백질과 무지 고형분은 NFC : RDP비율이 증가함에 따라 직선 적으로 증가하였다(P < 0.01). 그러나 우유중 요소태질소농도는 NFC함량이 증가함에 따라 유 의하게 감소하였다(P < 0.05). 이상의 결과로부터 사료내 증가하는 수준의 NFC는 반추위발효, 질소이용효율 및 산유량을 향상시켰고, 사료중 NFC : RDP비율이 3.0이상일 때 반추위발효뿐만 아니라 산유성적이 최대화되는 것으로 나타났다. This study was conducted to determine effects of different ratios (3.5, 3.0 and 2.5) of nonfibrous carbohydrate (NFC) to ruminally degradable protein (RDP) on in vitro fermentation and lactation performance of dairy cows and optimum ratio of NFC to RDP in dairy rations. In vitro trial was conducted up to 12 hr with ruminal fluidtaken from ruminally cannulated Holstein cows. The level of dietary NFC did not affect ruminal pH. The ammonia-N concentration was not significantly different among treatments until 6 hr incubation, however, it was significantly (P < 0.05) decreased as the ratio of dietary NFC to RDP increased on 9 and 12 hr incubation. For volatile fatty acids, concentrations of both acetate and propionate were significantly (P < 0.05) increased on 3 hr incubation as dietary NFC contents of treatments increased, in other incubation times, they had no significant differences among treatments. Valerate and A:P ratio were not affected by the ratio of NFC to RDP. Isoacids and total VFAs were significantly (P < 0.05) increased with increasing dietary NFC contents and their values were highest in the treatment of 3.0 ratio. Meanwhile, for in vivo trial, 18 Holstein lactating cows were allotted to treatments in three groups of 6 cows. They were employed for 24 weeks to investigate nutrient intakes, and milk yield and composition according to different ratios of dietary NFC to RDP. Intakes of dry matter and energy were significantly (P < 0.01) increased, but NDF intake was significantly (P < 0.01) decreased as the ratio of dietary NFC to RDP increased. Milk yield for the ratio of 3.5 (32.7 kg) was significantly (P < 0.05) higher than those of other treatments. Milk fat (%) was significantly (P < 0.05) higher for the treatments of 3.0 (3.79 %) and 2.5 (3.79 %) than that (3.48 %) for the ratio of 3.5, but milk fat yield was not different among treatments. Contents and yields for milk protein and solids-not fat were linearly (P < 0.01) increased as the ratio of dietary NFC to RDP increased. However, milk urea nitrogen concentration was significantly (P < 0.05) decreased with increasing dietary NFC levels. Our results showed that the increasing level of NFC in the diet of dairy cows enhanced ruminal fermentation, N utilization and milk production and suggested that maximal fermentation and lactation performance were achieved when the dietary ratio of NFC to RDP was more than 3.0 in dairy rations.
서인준,류상욱 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.5
Transparent ZnO/Al/ZnO multilayer electrodes that have been fabricated by atomic layer depositionwere examined. The resistivity of multilayer electrodes strongly depended on the thicknessof the inter-layer aluminum thin film. As the aluminum layer became thicker the resistivity decreased. By comparing theoretical calculations to experimental data we found that the resistivitychange was mainly due to the carrier scattering mechanism. The transparent multilayer electrodesshowed resistivities as low as 7 × 10−4 Ω-cm for 12 nm-thick Al inter-layer. The ZnO/Al/ZnOelectrodes were implanted in organic solar cell devices. The best results were obtained for theZnO(35 nm)/Al(6 nm)/ZnO(35 nm) configuration. The maximum power conversion efficiency andfill factor were 1.6% and 51%, respectively.