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조윤현 東亞大學校 大學院 1996 大學院論文集 Vol.21 No.-
This paper presents the design and characteristics analysis of induction machine for diesel-electric hybrid vehicle powertrain. diesel-electric hybrid vehicles are very efficacious in reduction of consumption energy, environment pollution and saftly yields with high dynamic ofr machines. However, their sophisticated construction requires from designers both complex made-technology and control strategy which would be able to put into practice this requirements. These problems are still considered in processing the design and analysis of induction machine. The requirements for a given volume, input power to weight ratio, high efficiency and wide speed range are met by the induction machine. The three phase induction machine with 12-pole, the maximum power, 34Kw and the maximum speed, 2300rpm is designed and manufactured. To investigate performance characteristics of the induction machine, the magnetic flux density is analyzed by the 2-dimensional F.E.M. and its performance is tested using the M-G dynamic tester. The experimental values are compared with the simulation ones. As a result of this work, it is found that good performances in terms of the efficiency, the primary current and the torque is obtained in the operation region of hybrid car, but no good performance occurs around the maximum speed region.
자기적 비선형성을 고려한 축방향 릴럭턴스 전동기의 정ㆍ동특성 해석
조윤현,김경호,윤선기 東亞大學校 大學院 2000 大學院論文集 Vol.25 No.-
The paper is described about the statatic and dynamic characteristics analysis of Axial Flux Reluctance Motor(AFRM) with the axial flux path against the rotating direction. To estiamte the performance considered the nonlinearity of magnetic circuit, the modeling parameters of AFRM are computed by the finite element method as functions of input current and angular displacement. The current, torque, back EMF and output power wave of AFRM are simulated from the motion equation by MATLAB/Simulink, and compared linearity simulation results with the nonlinearity ones.
돼지생식기호흡기 증후군(PRRS) 바이러스 감염시킨 돼지 기관의 병리학적 관찰
조성환,김현수,윤원기,전무형,류시윤,박배근,손화영,김무강 충남대학교 수의과대학 동물의과학연구소 1996 動物醫科學硏究誌 Vol.4 No.-
The porcine reproductive and respiratory syndrome virus was inoculated into swine tracheal organ culture. The ballooning degeneration of the tracheal ciliated epithelium and a decrease of ciliary activity from the tracheal organs infected with PRRS virus were observed one day post-infection(PI). Tracheal epithelium showed degeneration and focal necrosis 2 days PI. Epithelial necrosis and loss of cilia and epithelial cells became more severe 3 and 4 days PI. An entire loss of cilia and epithelial cells were recognized 4 days PI, however, control tracheal organs were normal during the period of the experiment except a little decrease of ciliary activities with time..