Institution: | 1.Laboratory of Mechanics, Department of Physics, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon ;2.Department of Electrical Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan ;3.Department of Adaptive Machine Systems, Osaka University, 2-1 Yamadaoka, Suita, 565-0871, Japan ; |