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허준영(J. Y. Huh),김대호(D. H. Kim),박종삼(J. S. Park) 유공압건설기계학회 2008 유공압건설기계학회 학술대회논문집 Vol.2008 No.10
These days the injection molding work and press work are in the trend of needing the precision control of position and pressure in a high speed. On the other hand the digital computer technology is developed rapidly. And recently the digital servo controller using micro controller become to be used broadly, because of the merit of digital communication. In this study the sequential control of hydraulic system switching from position to pressure and to position is tried using the HACD(Hydraulic Axis Controller Digital for electrohydraulic drives) which is manufactured in BoschRexroth. Though this the possibility of the precision sequential control using the digital servo controller HACD is examined.
김성환,권덕문,박종삼,이준일 대구보건대학 1998 대구보건대학 論文集 Vol.18 No.-
In this work, ^(60)Co irradiation testing was performed on bipolar transistors. The effect of total dose was discussed. When the total dose was larger than 10⁴ rad, the radiation effect was appeared in bipolar transistors. When the total dose was 10^(5) rad, the gain were decreased about 29~45.9%, the leakage voltage (V_(BC)) were changed about -75.4~+422.5%, and the collector-emitter bias was increased 2~120.3%.