Abstrucf-This paper describes a readhesion control system for the Korean High-speed Railway; To reduce the wheel abrasion and to improve traction efficiency, the adhesion characteristics between wheel and rail are analyzed. Also the re-adhesion control system is designed as a subsystem of induction motor control. In order to verify the performance of the proposed system, a downscaled readhesion control simulator is utilized. Both simulation and running test are executed and the results are evaluated.
Parallel Induction motor drive with PWM inverter control has been developed for the High-speed Railway. This paper describes a re-adhesion control system to improve a tractive efficiency and to reduce the wheel abrasion. The adhesion characteristics of the high-speed train are analyzed to get the maximum adhesion effort and the readhesion control system is designed as a subsystem of induction motor control. In order to verify the performance of the proposed system, a downscaled readhesion control simulator is set up and running tests are executed.
Hovenia dulcis var. koreana Nakai, the oriental raisin tree, has been considered not only fruit but an herbal medicine in East Asia including Korea, Japan and east China. As honey plant, value of this species had been rising steadily. The aim of this study was conducted to develop the propagation technique by scion collection time, scion age and vinyl house on survival rate of H. dulcis. The survival rate by veneer grafting showed no significant differences among 3 new cultivars. The scion collection at the northern temperature zone was observed to be the most appropriate time before the spring equinox when the plants are fully dormant. Especially, the installation of vinyl house showed 86% survival rate by veneer grafting. The scion age was effective 1 year shoot than 2 years shoot for increase the grafting survival rate. In this case, the installation of vinyl house can contribute above 80%.
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