1. School of Wood, Water and Natural Resources, Faculty of Agronomy and Agricultural Sciences, Ebolowa Campus , University of Dschang , P. O. Box 786 , Ebolowa , Cameroon
2. Laboratory of Modelling and Simulation in Engineering, Biomimetics and Prototypes, TWAS Research Unit, Department of Physics, Faculty of Science , University of Yaoundé I , P. O. Box 812 , Yaoundé , Cameroon
3. National School of Agro-Industrial Sciences, Department of Electrical, Energetic and Automatic Engineering , University of Ngaoundere , Ngaoundéré , Cameroon