1. Research Unit of Condensed Matter, Electronics and Signal Processing, Department of Physics, University of Dschang, Cameroon
2. Research Unit of Industrial Systems Engineering and Environment (RU-ISEE), Fotso-Victor University Institute of Technology, University of Dschang, Cameroon
3. Laboratory of Modelling and Simulation in Engineering, Biomimetics and Prototypes and TWAS Research Unit, Faculty of Science, University of Yaoundé I, Cameroon