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나승환(S . H . Na),백동훈(D . H . Baik),정연후(Y . H . Chung),나종삼(J . S . Na) 한국축산학회 1991 한국축산학회지 Vol.33 No.12
This study was carried out to investigate the relationship between body weight and body measurements by pre- and postweanig age. Data used for this study included the records of a total of 986 heads of Korean Native Cattle raised in Alpine Experiment Station from 1974 to 1988 The determinant coefficients(R-) of final steps at pre- and postweaning age obtained from stepwise regression anlysis in hulls were (0.97 and 0.87, respectively, and for heifers they were 0.94 and 0.77 respectively. At pre- and postweaning age, chest girth and body length turned out to have high contribution to the body weight in bulls. For heifers, however chest girth and withers height at preweaning and chest girth. rump width. chest depth and hipbone width at post-weaning turned out to have great contribution to the body weight, respectively.
나승환(S . H . Na),백동훈(D . H . Baik),신원집(W . J . Shin),정창화(C . H . Chung),정연후(Y . H . Chung),강수원(S . W . Kang) 한국축산학회 1992 한국축산학회지 Vol.34 No.1
This study was carried out to investigate the effects of the environmental factors on economically important traits of Korean Native Cattle. The traits studied were body weight, body length and chest girth. Data used for this study included the record of a total of 986 heads of Korean Native Cattle raised at Alpine Experiment station located in Kangwon province from 1974 to 1988. The results obtained in this study were as follows ; Overall least square means and standard errors for body weight of the bull at birth, 6, 12 and 18 months of age were 25.9±0.18, 130.9±1.01, 322.1±1.74 and 453.2±3.20㎏, respectively. The body weights of heifers were 23.9±0.21, 112.9±1.44, 175.3±2.34 and 229.0±3.31㎏, respectively. The least squares means and standard errors for body length and chest grith showed the range of 57.4±0.23∼142.9±0.46 and 68.2±0.22∼184.2±0.59㎝ through overall months of age in bulls, respectively. Those computed from the female showed the range of 56.2±0.33∼118.9±0.59 and 66.6±0.29∼146.7±0.78㎝, respectively. The effects of year of birth showed significant differences for most of traits. The effect of season was significant for body weight at 12 and 18 months of age in bulls, body weight at 6 months, body length at birth, 6 and 12 months and chest girth at 6 months of age in heifers. The parity effects were significant only for body weight at 12 months of age in heifers and chest girth at 12 months of age in bulls. The effect of dam age was not significant for body weight at 18 months in bulls and 12 months in heifers and was not significant for chest girth at birth in bulls and chest girth at birth, 12 and 18 months in heifers.
광학적 Faraday Rotator용 Pulse Forming Network의 제작 및 시험
金允溟,羅勝煥,李相洙,安明浩 단국대학교 1990 論文集 Vol.24 No.-
An optical Faraday rotator is designed with the HOYA FR-5 rotator glass and the pulse forming network(PFN). The polarization of the traveling light rotates 45° in this glass when magnetic field intensity is about 3.0×10^5 AT/m. The current of 2.25kA flowing in the coil of the 9cm inside diameter, 29cm long and 41 windings generates this magnetic field. This current of 84μsec duration can be obtained with a PFN. The network is analyzed numerically to find the relevant circuit parameters, initial charging voltage of capacitors and the voltage/current waveforms. The measured waveforms of the assembled PFN are in good agreement with the computed waveforms.