Toshihide IBARAKI Hiroshi KISE Hisashi MINE
Let J
Toshiro ARAKI Kenichi TANIGUCHI Tadao KASAMI
This short paper treats some decision problems for Petri Nets and shows that the problems of the safeness, the reachability and the proper termination are NP-complete for Petri Nets in which each transition fires at most once.
Minoru YAMADA Hideaki NISHIZAWA Yasuharu SUEMATSU
Single axial mode oscillation in Integrated Twin-Guide AlGaAs laser fabricated by sputter-etching was observed by current injection pumping at room temperature, as predicted by theory.