Mail address：

Department of Applied Mathematics Shou-Feng, Hualien, Taiwan974R. O. C. National Dong-Hwa University

Office address：

Department of Applied Mathematics A330 Science and Endineering Building, Dong Hwa University, Hualien 974, Taiwan

Email：

math@gms.ndhu.edu.tw

FAX：

+886-3-890-0161