Affiliation: | (1) Department of Mathematics, Nagoya Institute of Technology, Gokiso, Showa, 466 Nagoya, Japan;(2) Department of Electrical and Computer Engineering, Nagoya Institute of Technology, Gokiso, Showa, 466 Nagoya, Japan;(3) Department of Mathematics, Daido Institute of Technology, Daido, Minami, 457 Nagoya, Japan |