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김승철,정성종,Kim, Seung-Cheol,Jeong, Seong-Jong 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.10
In order to minimize straightness error of deflected shaft, a geometric adaptive straightness controller system is studied. A multi-step straightening and a three-point bending process have been developed for the geometric adaptive straightness controller. Load-deflection relationship, on-line identification of variations of material properties, on-line springback prediction, and real-time hydraulic control methodology are studied for the three-point bending process. By deflection pattern analysis and fuzzy self-learning method in the multi-step straightening process, a straightening point and direction, desired permanent deflection and supporting condition are determined. An automatic straightening machine has been fabricated for rack bars by using the developed ideas. Validity of the proposed system is verified through experiments.
Mycobacterium bovis BCG 암세포 증식 억제 효과에 관한 연구
김승철 단국대학교 대학원 1992 學術論叢 Vol.16 No.-
The Study reported here was designed to determine the efficacy of Bacillus Calmette-Guerin(BCG) treatment against sarcoma 180 tumor cells suppression in Balb/c mice. The result were as follows: 1. A group of mice previously injected with BCG(3.0 × 10^6 CFU) on day-1, 1, 4, 8 is the most effective and its mean survival period have two folds longer than that of non-injected control. 2. 12.0 × 10^6 CFU of BCG previosly injected group on days -1 is very effective and mean survival period have two folds longer. 3. The amount of B lymphocyte were markedly increased in BCG sensitized mice. 4. The observation of apparent changes from serum protein electrophoresis.