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차영재,유병돈,최응수,이덕원,김태훈,한정환 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.2
Reduction behaviour of iron oxide(Fe_2O_3) in carbon-iron oxide pellets was investigated in the temperature range of 1100-1500℃. The unreacted oxygen and carbon content in the pellet as well as the reduction degree of the iron oxide which depends on the reaction time were evaluated by means of the off-gas analysis. The reduction rate of iron oxide was very fast. The apparent reduction degree of iron oxide above 90% is obtained in about 10 minutes of reaction time. In the initial stage of reaction, up to about 80% of reduction degree of iron oxide, the reaction is controlled by the gasification reaction of carbon. The empirical rate equations for the reduction reaction of iron oxide were derived, and which agreed well with experimental values.
최현석,이준,정명철,윤덕원,한창수,홍원표,강응구,최헌종 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
Recently High precision positioning device is used in many kinds of manufacturing and scientific insruments. Piezoelectric tranduser is applied to the positioning devive as actuator. PZT has a high resolution, however, moving range is short. Many researcher have developed the mechanism for increasing a motion range. The types of increasing motion range mechanism with PZT are inertial slider, friction driver, ultrasonic motor, etc. In this paper we discuss the review of the high precision actuctor mechanism with PZT. Many kinds of mechanism for high precision are shown and compared.