• Asian-Australasian Journal of Animal Sciences
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• 제18권10호
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• pp.1457-1463
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• 2005

In this research, the possibilities of using canola meal (CM) in place of soybean meal (SBM), and also the effects of multi-enzyme and phytase supplementation on the performance of quails were investigated. For this purpose, soybean meal (44% CP), canola meal (37% CP), phytase (produced from Peniophora luci) and multi-enzyme ($\beta$-glucanases, pectinases, cellulases and hemicellulases) were used. CM was used supplying 0, 25 and 50% of CP from SBM and each of the phytase and multi-enzyme blends were added to the each level. This study was conducted with 675 day old quails (Coturnix coturnix Japonica) in 9 groups with 3 replicates including 25 birds (mixed sex) per replicate. Nine isocalaric and isonitrogenous diets were prepared. The effects of enzymes and CM levels were studied with a 3${\times}$3${\times}$3 factorial arrangement for three CM levels (0, 25 and 50%), three treatments (without enzyme, phytase enzyme and multi-enzyme) and three replicates. While the 25% CM level did not affect the liveweight gain 50% CM level decreased the liveweight gain (p<0.05). Multi-enzyme addition to the 50% CM group increased the liveweight gain compared to the other groups (p<0.05). CM levels and enzyme supplementation had no effect on feed consumption, feed conversion ratio, dressing percentage, viability, tibia ash content, Ca and P contents of tibia ash, viscera weight, gizzard weight and length of growth period. While heart weight and liver weight were not affected by CM levels, but they were affected by enzyme supplementation. CM levels and enzyme supplementation did not affect final liveweight, feed consumption, feed conversion ratio, egg yield, egg weight, shell weight and shell index during laying period. The increase in the CM level lightened the colour of the yolk (p<0.05).

• 한국전자파학회논문지
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• 제16권2호
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• pp.189-193
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• 2005

본 논문은 MB-OFDM UWB 시스템에 적용할 수 있는 직접 변환 방식용 하향 주파수 변환기 구조를 제안한다. 제안하는 주파수 변환기 구조는 $3\~5\;GHz$ 광대역 입력 매칭을 하기 위해 일반적으로 CMOS로 구성된 트랜스컨덕턴스 회로를 사용하지 않고, 저항을 사용하였다. 하향 주파수 변환기는 $0.18\;{\mu}m$ CMOS 공정으로 구현하였으며, 측정 결과 3개의 UWB 채널에 대하여 최소 +3 dB의 주파수 변환 이득과 각각 3 dB 이하의 게인 평탄도를 보이며, 1.8 V dc Power supply에서 0.89 mA를 소비한다.

• Asian-Australasian Journal of Animal Sciences
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• 제16권9호
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• pp.1348-1354
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• 2003

The feeding value of high-oil corn fed to Taiwan Country (TC) chicken was examined by measuring apparent metabolizable energy (AME), growth performance, sexual maturity, carcass characteristics, and plasma pigmentation. In a completely randomized design, 870 sex-intermingled one-wk-old chicks were assigned to one of 30 floor pens, 29 birds per pen, and each pen randomly assigned to one of five dietary treatments. The experiment was ended when birds were 16 wk of age. The five dietary treatments varied in main fat sources, which were corn oil (CO), high-oil corn (HOC), lard (LRD), whole soybean (WSB) and yellow corn (YC), respectively. All the diets were formulated isonitrogenously, isocalorically, and of equal lysine and methionine contents except YC, in which equal amounts of YC replaced HOC. The results indicated that feed conversion in HOC was 8% higher (p<0.05) than YC whereas the calculated AME of HOC was only 3.5% to 4.0% higher than that of YC. No significant differences were observed in body weight, body weight gain, feed consumption, feed conversion ratio and ME efficiency for body weight gain among CO, HOC, LRD, and WSB. No significant differences existed in both skin and muscle pigmentation of breast among the five dietary treatments. No significance differences existed in plasma carotenoid content measured at various ages among the five dietary treatments except that birds fed with HOC had less (p<0.05) plasma carotenoids at 16 wk-old. The results indicate that if the price of high-oil corn is no more than 1.05 times that of yellow corn, the dietary cost per kg of body weight gain for TC chickens fed diets containing high-oil corn will be less, although their body weight may be lighter compared to chickens fed diets formulated with other fat sources.

• 한국통신학회논문지
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• 제37권7A호
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• pp.545-551
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• 2012

본 논문에서는 K대역의 신호를 수신하여 저잡음 증폭 및 L대역으로 하향 변환하는 다채널 전단 수신기를 설계 및 제작하였다. 제작된 다채널 전단 수신기는 잡음지수 2.3 dB 이하의 특성을 가지는 GaAs-HEMT 기반의 저잡음 증폭소자, 이미지 성분의 억제를 위한 IR(Image Rejection) Filter, 이미지 성분 억제와 IMD (Intermodulation Distortion) 특성 개선을 위한 IR(Image rejection) 믹서를 포함한다. 제작된 다채널 전단 수신기의 시험결과, 3.8 dB 이하의 잡음지수와 27 dB 이상의 변환이득을 가지며 입력신호 기준 -9.5 dBm 이상의 P1dB(1dB Gain Compression Point) 특성을 나타내었다.

• Asian-Australasian Journal of Animal Sciences
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• 제17권3호
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• pp.386-393
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• 2004

This study was conducted to investigate the effects of feeding dried leftover food (DLF) on growth, body composition and feed conversion of broiler chicks. One hundred ninety-six of one-day old Ross broiler chicks were assigned to 7 treatments in a completely randomized design. Each treatment had four replications with seven chicks per replication. The treatments groups included control without DLF, dietary 10% level of DLF, dietary 20% level of DLF and dietary 30% level of DLF, 5% higher protein level of diet containing 10% DLF, 10% higher protein level of diet containing 20% DLF and 15% higher protein level of diet containing 30% DLF than control diet. Body weight gain was slightly higher in control group than that of DLF-fed groups. However, there were no significant differences in body weight gain among those groups fed diets containing different levels of DLF. In general, increasing dietary level of DLF resulted in decreasing feed conversion. Content of crude protein in whole broiler body was slightly higher in control group although any significant difference was not found among treatments (p>0.05). Content of crude fat in whole broiler body was lowest in groups fed diets containing 30% DLF with 15% higher protein level than control diet, showing significant difference from groups fed diets containing 20% DLF (p<0.05). Contents of total cholesterol, free cholesterol, cholesterol ester and LDL- cholesterol in blood of broilers fed DLF-containing diets generally appeared to be higher compared with control group without significant difference (p>0.05). Fatty acid contents in broiler meat were higher in the order of oleic acid, palmitic acid and linoleic acid without significant differences among treatments. Content of DHA in broiler meat was higher in groups fed diets containing DLF than that of control group although there were no significant differences among treatments (p>0.05).

• 농업과학연구
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• 제48권3호
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• pp.387-396
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• 2021

This study was conducted to provide basic data for efficient Hanwoo beef production by conducting a comparison of growth performance, blood metabolites, testosterone, and carcass characteristics of Hanwoo according to complete and hemi-castration. Twelve Hanwoo calves were allotted to two treatment groups as follows: CC = complete-castration and HC = hemi-castration method of removing only one testicle. At the end of the test, the body weight was 66 kg higher in HC than in CC, and the average daily gain increased by 12.6% (p < 0.05). The feed conversion ratio was significantly improved in HC compared to CC (p < 0.05). Serum cholesterol and triglyceride concentrations were significantly higher in CC than HC in both the growing and fattening periods (p < 0.05), and serum testosterone concentrations before castration were similar between HC and CC, but steadily increasing in HC after castration. Back fat thickness and marbling score were significantly higher in CC than HC in the entire period (p < 0.01). In the results of this study, hemi-castration can improve body weight gain and feed conversion ratio due to the influence of male hormones compared to complete castration, but it is considered that there will be difficulties in producing high-quality meat with a high marbling score.

• Asian-Australasian Journal of Animal Sciences
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• 제9권2호
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• pp.127-132
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• 1996

Effects on feed intake, liveweight gain and economic benefits of supplementing lambs with urea molasses blocks, were studied. Forty eight crossbred lambs were divided into 6 groups and assigned randomly to grazing on native pasture (CONT) or along with supplements of Commercial ration (COM) and urea molasses blocks (UMBs) containing two levels of cement and calcium oxide as a binding agent. Analysis of variance revealed highly significant (p<0.01) differences in dry matter (DMI, g/day), crude protein (CPI, g/day) and metabolizable energy (MEI, MJ/day) intakes. Differences in liveweight gain (LWG, g/day), feed conversion ratio (FCR) and net economic benefit of supplementation were also highly variable. The intake of DM, CP and ME varied from 974 to 1002, 66-70 and 7.6-8.4 in lambs supplemented with UMBs, significantly (p<0.01) greater than 848, 52.5 and 5.6 in lambs supplemented with COM or FCR and net economic benefits (54.3; 57.8; 17.1 and 1.96; 2.4) in lambs supplemented with COM and UMB-2, were CONT or supplemented with UMB-1, UMB-3 and UMB-4 respectively. Factors responsible for differences in feed intake, liveweight gain and economic benefits, are discussed.

• 한국통신학회논문지
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• 제35권5A호
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• pp.519-527
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• 2010

본 논문에서는 레이더 탐지기용 RF 모듈단의 광대역 저잡음 증폭기, 혼합기 그리고 발진기를 설계 및 구현하였다. 이득 평탄도가 좋지 않아 특정 주파수에서 감도가 저하되는 기존 상용 제품의 단점을 개선하기 위해 RF 모듈단의 구조를 제안한다. 제안한 RF 모듈단은 광대역 2단 저잡음 증폭기와 혼합기, 그리고 세 개 대역의 발진기로 구성되어 여러 주파수를 검출할 수 있는 동시에 최대 이득과 이득 평탄도를 향상시켰다. 제작된 RF 모듈단의 측정 결과, 전 대역에서 36 dB 이상의 변환 이득을 나타내었으며 이득 평탄도는 5 dB를 나타내었다. 이러한 결과는 기존 상용 제품의 문제점인 최대 이득을 35 dB에서 41 dB로 6 dB 향상시켰고, 이득 평탄도 또한 22 dB에서 5 dB로 17 dB 개선시켰음을 보여준다.

• 한국정보통신학회논문지
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• 제14권11호
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• pp.2391-2396
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• 2010

본 논문에서는 국부발전 신호와 수신 RF 신호 전력을 제어할 수 있는 전력제어 6단자 소자를 구성하고 설계 제작하였다. 가변적인 6단자 수신 신호 전력을 제어하여 일정한 전력 세기를 갖는 6단자 소자 출력 신호로 유지하여 전력 검파기의 포화 및 성능 열화를 방지할 수 있는 직접변환 6단자 구조를 제안하였다. 이를 위하여 직접변환 수신방식의 성능을 개선하고 유지할 수 있는 전력제어 6단자 소자를 해석하고, 전력제어 소자와 6단자 소자를 구현하였다. 제작된 전력제어 6단자소자는 1.69 GHz주파수 대역에서 36 dB의 전력 제어와 약 1.6 dB 이내의 이득차, 그리고 약 $4^{\circ}$ 이내의 위상차를 갖는 양호한 수신 전처리기 성능을 나타내었다.

• 한국전자파학회논문지
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• 제14권11호
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• pp.1191-1197
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• 2003

무선 통신 시스템에서 고속 데이터 전송에 효율적인 다중 반송파 시스템인 OFDM통신 시스템에서는 송수신단의 오실레이터에서 발생하는 위상잡음이 인접채널간 간섭(Inter-carrier-interference: ICI)을 야기시켜 통신 성능에 악영향을 끼친다. 본 논문에서는 ICI영향을 효과적으로 줄일 수 있는 새로운 data-conversion 형식의 ICI 제거 방법을 제안하고 위상잡음을 선형 근사화하여 위상잡음에 의해 발생하는 common phase error(CPE), ICI 그리고 carrier to interference power ratio(CIR)를 분석한다. 그리고 data-conversion 형식의 위상잡음에 의한 성능 개선 효과를 분석하기 위해서 기존의 OFDM과 비교하였다. 이때 부반송파수 64의 조건하에서 위상 잡음 분산 0.3의 QPSK변조방식과 위상 잡음 분산 0.1의 16 QAM변조방식의 경우, BER=$10^{-3}$에서 각각 0.6 ㏈, 1.5 ㏈의 SNR 이득을 가짐을 볼 수 있다. 결과적으로 ICI 제거방법을 사용하였을 때 기존의 OFDM system에 비하여 ICI에 의한 성능손실을 효과적으로 줄일 수 있다.