Since the encoder and resolver are expensive, it is difficult to apply it as a position sensor of a motor in a real industrial field. Optical position sensors, such as encoders and resolvers, are also difficult to mount because of their size and durability. Therefore, in order to solve these problems, we propose a system that uses a linear motor as a stator and a magnet plate as a mover, and a system that excludes a separate linear scale and uses two linear Hall sensors and permanent magnets to generate a conventional sine wave, A linear motor capable of detecting an absolute position and a movement position of a magnet, a control method thereof, and a technology development that can reduce a production cost by developing a position control system using a magnet mover that can improve stability and reliability.

본 연구는 허브 부식토를 이용하여 첨가 수준별 in vitro 반추위 발효특성 평가와 젖소를 이용하여 급여시 유생산성에 미치는 영향을 조사하기 위하여 본 연구를 수행하였다. 시험 1에서는 티머시 건초를 기질로 하여 허브부식토(herbaceous peat)를 0,1 및 5%를 3반복으로 각각 첨가하여 in vitro 반추위내 pH, 가스발생량, VFA (volatile fatty acid), ammonia-N 및 건물분해율을 조사하여 반추위내 발효성상의

The experiment was conducted to investigate the effects of feeding herbaceous peat on growth performance and meat quality of Holstein beef cattle. Total of 20 Holstein beef cattle (18~20 month of age, 657±31kg body weight) were conventionally and separately fed a concentrate diet and rice straw for 134 days. The dietary treatments were randomly assigned by complete block design into four treatments, each of which were five heads in early fattening stage. The treatments in this study were the control group fed basal diet, feeding herbaceous peat group (5%/diet, T1), feeding coated vitamin C group (20g/head, T2) and feeding mixture of herbaceous peat and coated vitamin C group (5%/diet+20g/head, T3). The initial body weights between the groups of control, T1, T2 and T3 were similar showing with 689±31, 661±24, 659±32 and 622±19kg. The daily body weight gain was higher in T3 by 8.3% than that in the control (p

This study was conducted to determine the effects of supplementing herbaceous peat preparation and vitamin C in order to find out its effects on immunity and growth performance in Holstein calves. Twenty Holstein calves (39.3±4.21kg average initial body weight) were allocated into four treatments by completely randomized design. Dietary treatments included: 1) control (Basal diet), 2) treatment 1 (control +5% herbaceous peat), 3) treatment 2 (control+10g vitamin C) and 4) treatment 3 (control+10g herbaceous peat+10g vitamin C). The duration of the experiment was 38 days in this experiment, and blood metabolism, dry matter intake, body weight and diarrhea frequency were investigated. For blood metabolism, white blood cells (WBC), neutrophils (NE), lymphocytes (LY), and red blood cells (RBC) did not show any significant differences among treatments. Average daily gain and feed conversion were highest in T1 group feeding with the herbaceous peat preparation compared to the control groups and diarrhea frequency showed lowest in T3 group. Overall results of the present experiment indicated that dietary supplementation with herbaceous peat influenced positively on growth performances in Holstein calves.