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이정한(J.H.Lee),천길정(G.J.Cheon),김주호(J.H.Kim),김충(C.Kim),한동철(D.C.Han),명제형(J.H.Myung),정태형(T.H.Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
An experiment for measuring dynamic characteristics of the planetary gear trains has been carried out using a power circulating type test rig. The measured parameters are strains of the planet gear shaft, carrier displacements, as well as the torques of the input and output shafts. Frequency analysis was executed for the carrier displacement
젖소에 대한 성장호르몬 ( rbST ) 투여가 유생산 , 유성분 및 호르몬 수준변화에 미치는 영향
이종문(J . M . Lee),최순호(S . H . Choi),김주호(J . H . Kim),임관열(G . Y . Lim),명규호(K . H . Myung),이기종(K . J . Lee) 한국축산학회 1991 한국축산학회지 Vol.33 No.12
Two experiments were conducted to evaluate the effect of recombinantly derived bovine somatotropin (rbST) on milk production, feed efficiency, milk composition and hormones in lactating dairy cows. In daily injection treatment, 15 Holstein cows were allocated to 3 treatments consisted of 0 ㎎/day, 12.5 ㎎/day and 25.0 ㎎/day. The injection of rbST was conducted intramuscularly once a day beginning at day 28 postpartum and continuing for 210 days. In a sustained release treatment, 12 Holstein cows were allocated to 3 treatments consisted of 0 ㎎/2 weeks, 500 ㎎/2 weeks and 750 ㎎/2 weeks of rbST (SR-rbST) injected subcutaneousely once at 2 week intervals beginning at day 254 postpartum and continuing for 28 days. Cows were fed concentrates containing 19.0% CP and 72.4% TDN, and corn silage (30 ㎏/day) throughout the experimental period. The rbST injection (25 ㎎/day) increased 4.0% FCM milk production by 18.0% during treatment period and by 11.7%, compairing with the milk yield of pretreatment period for control cows, while SR-rbST (750 ㎎/2 weeks) injection by 7.0% above control group. There are slightly decreased tendencies in body weight gain after rbST treatments. Milk fat, protein and lactose percentages were slightly highter in rbST treatment groups (12.5 ㎎/day and 25.0 ㎎/day) but did not show statistical difference. However, DM intake of concentrate was increased by 11.0%. showing the highest feed efficiency (㎏ 4.0% FCM/㎏ DM) in 25,0 ㎎/day treatment. Concentration of bST in serum was significantly (P$lt;0.05) higher in rbST treatments (23. 96 and 49.23 ng/㎖) than that of control (15.26 ng/㎖) but milk bST concentration did not differ among treatments (0.32, 0.35 and 0.36 ng/㎖). Furthermore, serum IGF-1 were increased by two-fold with two rbST injection groups (63.53 and 65.60 ng/㎖) although milk IGF-I concentrations were similar for all treatments. Therefore, it could be concluded that rbST and SR-rbST administrations to lactating Holstein cows efficiently improve dairy performances without altering milk composition in a whole and a late lactation period, respectively.
이정한(J.H.Lee),류형태(H.T.Ryu),천길정(G.J.Cheon),김주호(J.H.Kim),한동철(D.C.Han) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Dynamic analysis on a star type epicyclic gear train supported with joural bearing has been carried out. The loci of the planet gear, sun gear, and ring gear have been analized. Forces acting on the gear surface has also been analized.<br/>
김종민(J. M. Kim),박정배(J. B. Park),김주일(J. I. Kim),천민우(M. W. Chun),김바다(B. D. Kim),김주호(J. H. Kim),이정호(J. H. Lee),이충근(C. G. Lee),이대엽(D. Y. Lee) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.6
In order to develop a HST rear wheel auxiliary drive, which can be selectively used depending on work environment, a feasibility of HST with driving and steering function was studied for a 3.5 ton class forklift. For accurate control of HST, steering angle and revolutions were precisely measured with potentiometers and encoders, respectively. And the wheel load was measured using load cell to obtain the required power output of the rear wheel. This help accurately control the number of revolutions when make a turn. In order to minimize the decrease of fuel consumption due to the installation of HST, hydraulic energy was regenerated and analytical study using SimulationX was performed for optimization. Also, a standard test cycle to evaluate an improvement of fuel economy by energy regeneration was developed and applied to this study.
굴삭기 작업 모의 동작에 의한 연비 시험 방법 평가 연구(II)
최진구(J. G. Choi),강주영(J. Y. Kang),이정호(J. H. Lee),이충근(C. G. Lee),김주호(J. H. Kim),이대엽(D. Y. Lee) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.11
This work to evaluate a test method to measure fuel consumption of excavators using work simulated motion. For this, a mass flowmeter, to measure fuel consumption in real time, is installed on an excavator. In order to measure the rotational angles within the accuracy of approximately about 14 centimeters, respectively, for bucket, arm, boom, swing, potentiometers are installed at the rotational center of each actuator. When the relation between rotational angle and fuel consumption was analyzed, which has revealed the fuel consumption due to swing is largest. Since fuel consumption varies depending on driving skill of a driver, this work may contribute not only to evaluate a standard method to measure fuel economy of excavators but also to enhance the driver"s driving skill to improve fuel economy at work sites of excavators.