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      • 조사료의 종류가 홀스타인 송아지 유선의 발달 , 반추위 돌기 및 성장률에 미치는 영향

        조광근,최윤재,박영우,윤연화,한영근,윤상기,권웅기 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.6

        본 연구는 홀스타인 송아지에 대한 세 종류의 조사료가 유선조직, 반추위 유두, 번식성적 및 성장률에 미치는 영향을 조사하기 위하여 실시하였다. 출생 후 4일된 송아지(42.9±0.9㎏) 24두를 무작위로 선발하여 출생 후 4∼44일까지 전유를 급여하다가 45일에 그룹 1은 볏짚, 그룹 2는 오차드 그래스, 그룹 3은 알괄파를 급여하였다. 또한 유선조직과 반추위의 발달을 측정하기 위하여 3, 9, 18개월령에 도달하였을 때 각 처리구의 송아지를 1마리씩 도살하였다. 알팔파를 급여한 그룹 3은 다른 처리구에 비하여 중체율이 높았으며, 그룹 2는 영양소 이용률과 번식성적이 높은 경향을 나타내었다. 반추위의 무게는 3개월령 도달시에는 그룹 3이 가장 무거웠으나, 9개월과 18개월령 도달시에는 그룹 2에서 가장 무거운 것으로 나타났다. 반추위의 유두 수는 유두의 성장과 함께 일반적으로 감소하는 경향을 나타내어 유두의 길이와 유두 수와는 서로 상대적인 관계를 나타내었다. 유선의 기능적 활성을 나타내는 RNA/DNA 함량은 3개월 시에는 그룹 3이 가장 낮은 경향을 보였으나 9, 18개월 시에는 반대로 가장 높은 경향으로 나타났으며, 유선세포의 크기를 나타내는 protein/DNA 함량은 18개월 시에 그룹 2가 가장 높은 경향을 보였다. 결론적으로 본 연구에서 볏짚은 반추위의 초기 발달을 촉진하고 알팔파와 오차드그래스는 성장과 번식성적을 증가시키며 또한 초기에 유선의 발달을 촉진시키는 것으로 나타났다. Twenty-four Holstein calves were used to evaluate the effects of three different forages on growth and reproductive performances, and ruminal papillary and mammary developments. Four-day-old Holstein calves weighing 42.9±0.9 ㎏ were randomly assigned to three forage groups of rice straw (group 1), orchard grass hay (group 2), and alfalfa (group 3). All calves received whole milk from day 4 through day 44. At 45 days of age, the animals were assigned at random to one of the three dietary treatments. When calves reached the ages of 3, 9, and 18 months, one calf in each group was sacrifced for evaluation of ruminal and mammary tissue developments. Calves of group 3 gained more body weight than those of other groups, while group 2 showed an effective nutrient utilization and reproduction performance. At 3 months, the stomach weight of group 3 was the highest, however, group 2 provided the highest stomach weight at 9 and 18 months. A remarkable reduction in papillae number was observed in the rumens of all 3- to 9-month-old heifers. A decrease in number of these papillae was observed in all groups exhibiting papillary growth. There was a reciprocal relationship between the number and the length of ruminal papillae. Among the 3-month-old calves, the functional activity (RNAI DNA contents) of the mammary glands of group 3 was lower than those of other groups, whereas the trend was opposite for 9- and 18-month-old heifers. The size of mammary cell (protein / DNA contents) was the greatest for group 2 at 18 months of age. The results suggest that rice straw stimulated earlier development of rumen. Alfalfa and orchard grass improved the growth, reproduction performance, and earlier development of mammary glands.

      • KCI등재

        지하철의 사상사고 및 운전장애 분석에 관한 연구

        이동훈,목연수,장성록,권혁무,윤원영,옥영석,최용석,배동철 한국산업안전학회 1999 한국안전학회지 Vol.14 No.3

        The purpose of this study is to analyze death injuries and operation troubles of urban transit. No difference was shown in death rates between Line 1 of Pusan urban transit and Line 5, 7, and 8 of Seoul metropolitan transit. And relief time by another train did not depend upon the number of crews. We concluded that thorough inspection and preventive maintenance of trains and facilities are necessary for safe and timely service of urban transit.

      • KCI등재후보

        Cd1-xZnzS 박막의 성장과 광전도 특성

        문종대,정태수,신현길,김택성,이충일,홍광준,이상열,서상석,신용진,김혜숙,윤은희,김승욱,전승룡,유상하,이관교,박향숙,신영진 한국센서학회 1995 센서학회지 Vol.4 No.3

        Polycrystalline Cd_(1-x)Zn_xS thin film were grown on slide glass(corning-2948) substrate using a chemical bath deposition (C.B.D) method. They were annealed at various temperature and X-ray diffraction patterns were measured by X-ray diffractometor in order to study Cd_(1-x)Zn_xS polycrystal structure using extrapolation method of X-ray diffraction patterns for the CdS, ZnS sample annealed in N₂ gas at 550 ℃. It was found hexagonal structure which had the lattice constant a_o = 4.1364Å, c_o=6.7129Å in CdS and a_o = 3.8062Å, c_o = 6.2681 Å in ZnS, respectively. Hall effect on these sample was measured by Van der Pauw method and then studied on carrier density and mobility depending on temperature. We measured also spectral response, sensitivity maximum allowable power dissipation and response time on these sample

      • KCI등재후보

        CBD 방법에 의한 CdS1-xSex 박마의 열처리에 따른 광전기적 특성

        문종대,정태수,신현길,김택성,신영진,홍광준,유상하,서상석,최승평,이상열,신용진,이관교,김혜숙,윤은희,김승욱,전승룡 한국센서학회 1995 센서학회지 Vol.4 No.1

        Polycrystalline CdS_(1-x)Se_x, thin films were grown on ceramic substrate using a chemical bath deposition method. They ere annealed at various temperature and X-ray diffraction patterns were measured by X-ray diffractometer in order to study CdS_(1-x)Se_x, polycrystal structure using extrapolation method of X-ray diffraction patterns for the CdS. CdSe samples annealed in gas at a 0 it was found hexagonal structure which had the lattice constant a_0=-4.1364Å, c_0=6.7129Å in CdS and a_0=4.3021Å, c_0=7.3021Å in CdSe. respectively. Hall effect on these samples was measured by Van der Pauw method and then studied on carrier density and mobility depending on temperature. We measured also spectral response, sensitivity(γ), maximum allowable power dissipation and response time on these samples.

      • KCI등재후보

        강자성체 박막(Fe-Ni, Co-Ni)의 자기-저항 효과에 관한 연구(1)

        장충근,유중열,송재용,윤만영,박재형,손대락 한국센서학회 1992 센서학회지 Vol.1 No.1

        In order tp fabricate magnetoresistive sensor, Fe-Ni and Co-Ni alloys were evaporated on the slide glass and the silicon wafers. Saturation magnetic induction(Bs), coercive field strength(H) and magnetoresistance were measured for fabricated samples. The evaporated Fe-Ni thin films show that the saturation magnetic induction was 0.65 T, and coercive field strength was 0.379 A/cm, and this value was changed to 0.370 A/cm(//), 0.390 A/cm(⊥), respectively after magnetic annealing. For the measurement of coercive field strength, magnetizing frequency of 1 kHz was used. For the fabricated sensor element, the change of magnetoresistance (△R/R) was excessively unstable due to oxidation in the process of fabrication. The evaporated Co-Ni alloy thin films show that saturation magnetic induction was 0.66 T, and coercive field strengthes were 5.895 A/cm(//), 5.898 A/cm(⊥), respectively, after magnetic annelaing. The change of magnetoresistance(△R/R) was 3.6∼3.7% of which value was excessively stable to room temperature. Fe-Ni thin film could have many problems due to large affinity in the process of fabrication of magnetoresistance sensor, but Co-Ni thin film could be a suitable material for fabrication of magnetoresistance sensor, because of its small affinity and definite magnetoresistance effects.

      • KCI등재

        다이캐스팅한 SiC 입자강화 알루미늄 복합재료의 피로균열 전파특성

        김송희,윤여범,이기호,오준도,주희위,이지환 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.8

        This study is to investigate the effect of load ratio on fatigue crack of die-cast SiC particulate aluminum composites. Fundamental fatigue crack propagation tests were performed with sub-sized C-T specimens at a load ratio of 0.1, 0.3 and 0.5 respectively. Crack closure measurements were conducted for explaning the effect of load ratio on fatigue crack growth. The experimental results showed that the fatigue crack growth rate increases with the load ratio, especially at near threshold. The composite reinforced with 20 vol.% SiC particles was better in fatigue crack growth resistance than that with 10 vol.% SiC particles. Through the measurement of Kop and ΔK at various R ratios the concept of effective stress intensity factor range ratio. U was reviewed to evaluate the stress ratio effect on fatigue crack growth. Relationships between U and variables such as ΔK and R were obtained empirically so that we could predict ΔK_(eff) that is of critical importance for the prediction of fatigue crack propagation rate.

      • α-술폰 고급 지방산 모노글리세라이드의 계면활성(제2보)

        남기대,김태영,윤영균,김상춘,박상석 충북대학교 산업과학기술연구소 1996 산업과학기술연구 논문집 Vol.7 No.1

        This study is to fabricate the VTGI(very thin gate insulator) in order to study the dielectric charactristics and insulation properties. The thickness of VTGI is less than 100 Å which is applicable to the gate insulating thin film of the next generation semiconductor ICs. Nitride thin film is fabricated to make up high dielectric thin film and evaluate the performances of the insulating thin film of capacitor. The results are : 1) BDV distributions of MNS (T_N=5.8-8.3[nm]) are concentrated around the field range from 7 to 8 MV/cm. 2) As the results of evaluation of the TDDB characteristics, the electric field acceleration factor, γ=0.85 and the activation energy, E_∂=0.04eV are obtained in the sample of MNS structure (T_N=5.8-8.3[nm]). 3) The I-V characteristics of MIS structure can be explained as the mechanism of Schottky effect, Fowler-Nordheim. tunnel current, impact ionization and density of trap center and breakdown.. 4) The larger effective total trapping density would enhance the dielectric field strength of insulating layer. 5) MNS structure has higher permittivity and lower V_(FB) than MNOS structure. 6) Thin nitride film which is processed by LPCVD has relatively high dielectric breakdown strength at the insulating thickness range from 5.8 to 8.3[nm].

      • S . L . E . 환자 혈액에서 분리한 Listeria monocytogenes 의 세균학적 특성

        김혜숙,정윤섭,이삼열 대한미생물학회 1973 大韓微生物學會誌 Vol.8 No.1

        Listeria monocytogenes human infection is a relatively rare disease which usually is meningitis in newborn babies. The organism was isolated from blood cultures of a 52 year old female patient with meningitis. It was considered that the underlying disease, I.e. S.L.E., and the steroid therapy which the patient had been receiving played some role for the Listeria infection. The isoIate was showing characteristics of L. monocytogenes, I.e. diphtheroid like morphology, motility with four peritrichous flagella, hemolytic small colonies on blood agar, growth in the presence of 7. 5% salt and at 4 C, and inducing monocytosis in an experimentally infected rabbit. Serologically the organism was identified as L. monocytogenes 4b. The isolate was showing susceptibility to many antibiotics tested including ampicillin, penicillin and tetracycline which were the recommended drugs of choice for the treatment of Listeriosis. It is the general opinion that Listeriosis is not so rare as literatures are showing. It is considered that some of the isolate of the organism from clinical specimens are mistakenly discarded due to the fact that the organism shows diphtheroid like morphology and that not many laboratories are able to recognize the organism. Literatures are seen which emphasize more careful examination of gram positive bacilli with diphtheroid like morphology especially when they are isolated from blood or from spinal fluid of patient.

      • Ewald 합 기법을 이용한 구형 도파관의 H-면에 위치한 타원 편파 오프셋 십자 슬롯에 대한 해석

        김병문,조영기,윤리호,손현 경북대학교 전자기술연구소 2000 電子技術硏究誌 Vol.21 No.1

        This paper presents the analysis of an offset cross slot in the broad wall of a rectangular waveguide. The problem is formulated in teens of integro-differential equation which is solved using the method of moments with triangular Roop-top basis. For the effective numerical intgral evaluation, the Ewald sum technique is applied to the Green's function of the rectangular waveguide, transforming them into the rapidly convergent form. We have shown that a pair of narrow slots crossed at arbitrary angles and located at the proper point in the broad wall of an ordinary rectangular waveguide will radiate a wave very nearly circularly polarized at the desired direction.

      • KCI등재후보

        4'-Aminobenzo-15-crown-5 를 수식한 새로운 K+-ISFET 의 제조와 감응특성

        이홍락,윤종훈,양승태,정동숙,손병기 한국센서학회 1992 센서학회지 Vol.1 No.1

        A new potassium sensitive field effect transistor modified with 4'-aminobenzo-15-crown-5 was prepared and its response characteristics were evaluated. The response slope of K^+-ISFET for pH was 30.0 mV/decade and the response time was more than 3 minutes. And the response slope and time of the K^+-ISFET for potassium ion was 19.5±0.2 mV/decade and about 3 minutes, respectively. The linear response range of the sensor for potassium ion was 2.0X10^(-4)∼1.0X10^(-2)M. The selectivity coefficients of the K^+-ISFET for the alkali and alkaline earth metal ions were also evaluated. Sodium, ammonium and calcium ions exhibited relatively significant interference. The long term stability of the sensor was remarkably improved and it could be used for more than 50 days.

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