作者机构:[1]Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
相关基金:Project supported by the National Natural Science Foundation for Distinguished Young Scholars of China (Grant No. 60525303), the National Natural Science Foundation of China (Grant No. 60704009), the Key Project for Natural Science Research of the Hebei Educational Department (Grant No. ZD200908) and the Doctorial Fund of Yanshan University (Grant No. B203).