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한우 비육에 관한 연구 1 . Methylthiouracil 첨가 및 Estradiol 17β - Cypionate 주사가 약령 모우 비육에 미치는 효과
김창기 ( C K Kim ),이택원 ( T W Lee ),김종욱 ( J W Kim ),배대식 ( D S Bae ),오선균 ( S K Oh ),조지훈 ( C H Cho ),김법회 ( B H Kim ),김상렬 ( S Y Kim ),배신석 ( S S Bae ) 한국축산학회 1971 한국축산학회지 Vol.13 No.1
This study was performed to affirm any effects of methylthiouracil and estradiol 17β-cypionate administered to young bulls for short term fattening. Eighteen bulls of Korean native breed, approximately 1.5 to 2 years of age and 260㎏ to 360㎏ in weight, were used in this study. All bulls had received a basal ration of soiling corn and concentrate made up of 55% grains, 40% brans and 5% others, in a period of 40 days. Bulls were divided into six groups as follows: group C was not treated, group M-2 received 2g of methylthiouracil per day, group M-3 received 3g of methylthiouracil per day, group EM-0 was injected intramusculary with 25㎎ of estradiol 17β-cypionate in the neck region 10 days after the beginning of the fattening period, group EM-2 was injected with estradiol 17β-cypionate as above mentioned and simultaneously received 2g of methylthiouracil per day, and group EM-3 was injected with estradiol 17β-cypionate as above mentioned and simultaneously received 3g of methylthiouracil per day. The results obtained were summarized as follows. 1. The average daily gain was for group C: 0.83㎏, group M-2: 1.07㎏, group M-3: 1.40㎏, group EM-0, 0.93㎏, group EM-2: 0.95㎏, and group EM-3: 1.18㎏. The M-3 group gained significantly(P$lt;0.05) more weight than C and EM-0 group. There were no significant differences in the average daily gain between the groups injected with estradiol 17β-eypionate and the control group. 2. The average daily concentrate intake was as follows: group C: 5.47㎏, group M-2: 5.00㎏, group M-3: 4.52㎏, group EM-0: 5.21㎏, group EM-2: 4.35㎏, and group EM-3: 4.61㎏. The consumption of concentrate was decreased by 17% in the M-3 group compared with the C group. There was no significant difference in the soiling corn intake among these groups. 3. Feed consumed for 1㎏ gain were decreased by the supplementation of methylthiouracil. The consumption of DCP for 1㎏ gain was in group C: 0.82㎏, group M-2: 0.59㎏, group M-3: 0.41㎏, group EM-0: 0.70㎏, group EM-2: 0.59㎏, and group EM-3: 0.50㎏. The amounts of TDN required were; group C: 6.57㎏, group M-2: 4.76㎏, group M-3: 3.39㎏, group EM-0: 5.67㎏, group EM-Z: 4.87㎏, and group EM-3: 4.08㎏. The consumption of DCP and TDN for 1㎏ gain in the M-3 group was about a half of that in the C group. 4. There was not any significant difference in the increase in body measurements among the various groups. 5. The average margins in the fattening period of 40 days were for group C: 2,950won, group M-2: 5,327won, group M-3: 9,158won, group EM-0: 3,310won, group EM-2: 3,623won, and group EM-3: 5,575won. The margin of group M-3 was about three times higher than that of group C. In short, this experiment demonstrated that methylthiouracil when fed to young native Korean bulls at the proper level 40 days before slaughter would bring a noticeable effect on weight gain, feed efficiency and economic advantage. There were no advantages from the simultaneous injecting estradiol 17β-cypionate with methylthiouracil. The proper supplementation level of methylthiouracil would appear to be 3g per head per day in this experiment.
김창기,차상명,박희용,Kim, C.K.,Cha, S.M.,Pak, H.Y. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.1
A numerical solution for heat transfer in the flue tube of a pulse combustion water heater was presented. The $k-{\varepsilon}$ turbulent model was adopted to describe turbulent characteristics and radiative heat transfer was calculated by P-N approximation. Three pulsating conditions equivalent to existing experimental studies were used for analysis. Pulsating pressure was specified at the inlet and outlet of flue tube and numerical procedure using control volume method and pressure boundary condition was presented. It was found that the present mathematical model and numerical method could predict effectively the flow field and heat transfer for the flue tube in pulse combustor.
김창기,이찬용,신연승,Kim, C.K.,Lee, C.Y.,Shin, Y.S. 한국전자통신연구원 2003 전자통신동향분석 Vol.18 No.5
본 논문은 SDR Forum에서 SDR용 모바일 플랫폼 구성을 위한 소프트웨어의 표준으로 인정된 차세대 개방형 소프트웨어 프레임워크인 SCA의 구조에 대해 기술한다. SCA 소프트웨어 프레임워크는 궁극적으로 단일 모바일 플랫폼 환경에서 하드웨어의 변경 없이 무선으로 다운로드한 소프트웨어의 동작으로 다양한 무선 접속환경을 구성할 수 있도록 하는 내장형 시스템 소프트웨어들의 표준을 추구한다. SCA는 분산 객체 모델의 표준인 CORBA Middleware와 더불어 다중 무선접속 응용프로그램을 구성하기 위하여 컴포넌트 구성물의 수행을 뒷받침하는 개방형 소프트웨어 구조로서 크게 RTOS, CORBA Middleware, CF, Portable Software Resource로 이루어진다. 본 고에서는 SCA 소프트웨어 프레임워크의 기본 구조와 기능들을 최신 표준 동향을 기반으로 분석하고, 개발 사례에 대해서도 간단히 소개한다.
3GPP IP 멀티미디어 서비스를 위한 핵심망 구조 분석
김창기,신재승,신연승,조철회,Kim, C.K.,Shin, J.S.,Shin, Y.S.,Cho, C.H 한국전자통신연구원 2002 전자통신동향분석 Vol.17 No.3
서브 시스템의 구조와 기능 요소 및 관련 신호 프로토콜에 대해 기술하고 있다. IM 서비스란 이동가입자에게 하부에 IP 전송 프로토콜을 기반으로 하는 다양한 형태의 패킷 서비스들을 동시에 제공하는 것을 말한다. 이를 위해 3GPP에서 제시하고 있는 논리적인 ALL IP 망 구조는 IM CN 서브시스템을 포함하고 있는데, IM CN 서브시스템의 중요한 기능 요소로는 Call Session Control Function(CSCF)와 Home Subscriber Server(HSS) 등이 있다. CSCF는 가입자가 위치하고 있는 망에 따라서 가입자의 세션과 서비스를 제어한다. HSS는 가입자의 마스터 데이터베이스로 기존의 3G HLR의 모든 기능과 User Mobility Server(UMS) 기능을 가진다. 본 고에서는 위의 두 기능 요소들의 기능과 상호 간의 시그널링 프로토콜을 최신 동향을 기반으로 분석하고 기본적인 시그널링 절차도 기술한다.
한우비육에 관한 연구 2 . 방목시 Hexestrol Dicaprylate 처리가 Aberdeen Angus (♂) × 한우 (♀) 거세우의 비육에 미치는 효과
김창기 ( C K Kim ),이택원 ( T W Lee ),김종욱 ( J W Kim ),배대식 ( D S Bae ),오선균 ( S K Oh ),조지훈 ( C H Cho ),김법회 ( B H Kim ),김상렬 ( S Y Kim ),배신석 ( S S Bae ) 한국축산학회 1972 한국축산학회지 Vol.14 No.2
The effect of hexestrol dicaprylate implantation on the rate of gain of Aberdeen Angus(♂)×Korean native cattle (♀) F₁ steers were studied. Three steers were implanted with 100㎎ of hexestrol dicaprylate and 3 steers was not treated. All steers grazed native pasture with feeding supplements for 105 days. The average daily gain of the hexestrol implanted steers were more by 9.5% than that of the controls. However, there was no significant difference in daily gain between the groups. The daily gain in the present study were found to be less than that of the young bulls of Kim, et al. (1971). No undesirable side-effects such as development of mammary gland resulted from hexestrol implantation.
가축의 Trypanosoma 에 관한 연구 제3보 한우에 Trypanosoma 의 감염율 조사
김창기 ( K . C . Kim ) 한국축산학회 1974 한국축산학회지 Vol.16 No.3
A total of 712 cattle in summer and 438 cattle in winter were examined in Korea and 20 young calves which were born in January and in February from the naturally infected cows with Trypanosoma were investigated to study of Trypanosoma. The results obtained from the studies were as follows: 1. Evidence is presented that the infectious rate of Trypanosoma in summer is higher than in winter in the Korean cattle. 2. They didn`t show any typical. clinical symptom except that the increased number of leucocytes and reddish of conjunctiva. 3. The average size of Trypanosoma in the study was 18-27μX 1.5-2.5μ.
가축의 Trypanosoma 에 관한 연구 제4보 충북지방의 불임한우에 Trypanosoma 감염율 조사
김창기 ( K . C . Kim ) 한국축산학회 1974 한국축산학회지 Vol.16 No.3
A total of 100 non-sterilized cattle and 24 sterilized cattle were examined to investigate if any possibilities come from the non-pathogenic Trypanosoma to arise sterility in Korean cattle. The results obtained from the studies were as follows: 1. Evidence is presented that the infectious rate of Trypanosoma in the sterilized Korean cattle is 50% in the flat area, 37% in the middle area and 37% in the mountainous area. 2. Many numbers of Trypanosoma were found in the blood of sterilized cattle while there were small numbers of Trypanosoma in the blood of non-sterilized cattle but the infectious rate was almost same in the both groups. 3. Hematocrit value in the sterilized cattle is lower than that in the non-sterilized cattle.
한우비육에 관한 연구 3 . Hexestrol Dicaprylate 처리가 한모우비육에 미치는 영향
김창기 ( C K Kim ),이택원 ( T W Lee ),김종욱 ( J W Kim ),배대식 ( D S Bae ),오선균 ( S K Oh ),조지훈 ( C H Cho ),김법회 ( B H Kim ),김상렬 ( S Y Kim ),배신석 ( S S Bae ) 한국축산학회 1972 한국축산학회지 Vol.14 No.3
The effects of hexestrol dicaprylate (HESC) implantation on rate of gain and economic feed utilization were studied. Ten Korean native yearling bulls and a corresponding number of controls were used in this experiment. All animals were fed a fattening ration of soiling corn and concentrate made up of 50% corn, 48% brans and 2% others for 105 days. Implanting with 100㎎ of HESC increased rate of gain by 0.6%. Feed required per 1㎏ of gain was decreased by the implanting of HESC. Implanting with HESC increased rate of nutrient utilization for 1㎏ of body gain by 6.6% DCP and 6.9% TDN. No undesirable effects was noted in the experiment.