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콤바인 수확기(收穫機)의 고장특성(故障特性) 및 신뢰성(信賴性) 예측(豫測)에 관(關)한 연구(硏究)
김학규,정창주,Kim, H.K.,Chung, C.J. 한국농업기계학회 1986 바이오시스템공학 Vol.11 No.1
This study was intended to examine the failure characteristics and breakdowns of the head-fed type combines generally used on farms. The failure distribution was assumed to follow Weibull distribution function and the Weibull parameters of the major parts, units and combine as whole were estimated by using the data collected in a survey. A computer program for the estimation of the Weibull parameter was developed. Monte Carlo method was used in predicting the time between failures. The results of study may be summarized as follows: 1. The number of failures per combine was 4.83 times per year and 0.3 times per hectare of combines of different ages. 2. According to the Kolmogorov-Smirnov test method, it was proved that the Weibull distribution function is well fitted to the characteristics of the failure and breakdowns of combines. 3. Weibull parameters of failure distribution of the combine as a whole were estimated to give the shape parameter ${\beta}$=1.3089 and the scale parameter ${\alpha}$=105.2409. The combining area with 80% reliability was 1.1 ha, and the probability of operating the combine without any failure for a year, was $2.76{\times}10^{-4}$. 4. The mean time between failures (MTBF) of the combines was predicted to be 3.2 ha of operation, which corresponds to 32 hours of operation.
김학규(H . K . Kim),고문석(M . S . Ko),김인철(I . C . Kim),정행기(H . K . Chung),이광원(K . W . Lee),손동수(D . S . Son),김현(H . Kim),지설하(S . H . Chee),박창식(C . S . Park) 한국축산학회 1989 한국축산학회지 Vol.31 No.3
This study was carried out to investigate the effect of aluminium rack distance from liquid nitrogen surface in liquid nitrogen container on post-thaw sperm motility and NAR acrosome in maxi-straws. The post -thaw sperm motility and NAR acrosome for 15 cm from the liquid nitrogen surface were 57% and 56 % after 0.5 h incubation at 37℃, and 31 % and 38 % after 2 h incubation. The straws frozen from 5 cm to 25 cm above the liquid nitrogen surface did not show any significant differences on post-thaw sperm motility and NAR acrosome. The utilization of this deep-freezing method is considered to be acceptable under practical farm conditions.
5ml 스트로에 보존한 돼지 액상정액의 생존성과 수정능력에 관한 연구
정행기(H . K . Chung),김학규(H . K . Kim),고문석(M . S . Ko),김인철(I . C . Kim),최진성(J . S . Choi),이광원(K . W . Lee),손동수(D . S . Son),김현(H . Kim),지설하(S . H . Chee),박창식(C . S . Park) 한국축산학회 1989 한국축산학회지 Vol.31 No.3
This experiment was carried out to test the efficiency of BF5 diluent in improving the length of maintenance of the fertilizing capacity of liquid boar semen in 5ml maxi-straw. The sperm-rich fraction of each ejaculate was slowly cooled to room temperature by 2 h after collection. Semen was diluted with BF5 diluent to provide about 20 x 10` sperm/ml. Semen was cooled in a waterbath to 51℃ over a 2-h period and BF5(+2 % glycerol) diluent was added to cooled semen(1:1). Straws were imm ediately filled with 5ml of semen and steel or glass balls were used to seal the ends of the straws. The straws were horizontally placed on a metal rack and stored at 51c in a refrigerator. At insemination the straw was rediluted with 75ml BTS diluent. The BF5 diluent maintained boar sperm fertilizing capacity for 9 days of in vitro storage. Conception rate, farrowing rate and number of pigs born alive per litter of diluted semen stored at 51℃ for 9 days were 70%, 50% and 9.6, respectively.