In: Journal Jpn. Soc. Precis. Eng. (Japan), Vol. 54, No. 1, pages 157-163. January 1987. In Japanese.
Abstract: In order to realize a CAD system a design model and its operation must be established. A boundary factor model (BFM) is developed to describe the design model. The authors report on a way to control the BFM by reformulating it into a Petri net.