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Sulfonylurea계 제초제가 처리된 다년생 잡초의 재생양상과 저장전분량의 변화
황인택(Hwang I.T.),이관휘(K.H. Lee),홍경식(K.S. Hong),김진석(J.S. Kim),이병회(B.H. Lee),조광연(K.Y. Cho) 한국농약과학회 2002 농약과학회지 Vol.6 No.1
Characteristics of regrowth and starch degradation in perennial weed rhizomes were investigated in a greenhouse. Cyperus serotinus started regrowth at 24 days after treatment of 1.25 g ai/㏊ of pyrazosulfuron-ethyl. The regrowth of Sagittaria trifolia, Eleocharis kuroguwai, and S. pygmaea required 30~39 days, and Potamogeton distinctus regrew at 55 days after treatment of 1.25 g ai/㏊ of pyrazosulfuron-ethyl. However, all of 5 perennial weeds hardly regrew until 45 days after treatment more than 5 g ai/㏊ of pyrazosulfuron-ethyl. Regrowth of C. serotinus 4-node rhizomes was 2 times higher than 2-node rhizomes, and 1~1.5 g of E. kuroguwai large tubers regrew faster than 0.3~0.5 g of small tubers treated with bensulfuron-methyl. Regrowth of C. serotinus was enhanced with delayed application of bensulfuron-methyl, however, 2-leaf stage of E. kuroguwai plants regrew better than 3 leaf stage of plants when treated with equal volume of bensulfuron-methyl. The critical periods of S. trifolia and E. kuroguwai growth depending upon the rhizome detachment were 12 and 18 days after sprouting, respectively. The starch stacked in the S. trifolia and E. kuroguwai tubers were exhausted at 18 and 27 days after sprouting, respectively. The highest level of sugar contents was showed at 9 days after sprouting in S. trifolia, and 18 days after sprouting in E. kuroguwai.
김진석(J.S.Kim),김원(W.Kim),정용호(Y.H.Chung),정순배(S.B.Chung),김영덕(Y.D.Kim),김현수(H.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
Power flow characteristics of a hydro-mechanical transmission system(HMT) were investigated for tracked vehicle. in steering. A HMT consisting of two hydrostatic pumpㆍ motors(HST), several planetary gear trains and steer differential gear was considered. In order to obtain the direction and magnitude of the power flow of the HMT, network theory for the general power transmission was used. Network model for the HMT in steering was developed, which consisted of shafts, nodes and transmission elements such as clutch, gear, etc. Power flow analysis procedure consists of two stages: (1) traction force analysis in steering, (2) power flow analysis in HMT. Torque and Speed of every transmission element of the HMT was determined from network analysis. Also, efficiency, mechanical and hydraulic power loss including HST, were obtained. In addition, the regenerative power flow resulting from steering can be studied in graphic display. The power flow analysis program(PCSTEER) developed in this work can be used as a useful design tool for the tracked vehicle with HMT.<br/>
김진석(J. S. Kim),김현수(H. S. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
In this paper, a MPT(multi pass transmission) consisting of CVT, planetary gear, brake and clutch was designed in order to increase the speed ratio range while limiting the torque transmitted through CVT. The MPT is operated in two-mode, (1)MPC and (2) CVT mode. Simulation results showed that the MPT vehicle has better acceleration<br/> performance and fuel economy compared with those of CVT vehicle.<br/>