[1] Univ Maroua, Inst Mines & Petr Ind, Dept Mech & Elect Engn, POB 46, Maroua, Cameroon
[2] Hanoi Univ Sci & Technol, Sch Elect & Telecommun, 01 Dai Co Viet, Hanoi, Vietnam
[3] Amirkabir Univ Technol, Dept Biomed Engn, 424 Hafez Ave, Tehran 158754413, Iran
[4] Univ Yaounde I, Fac Sci, Dept Phys, Lab Modelling & Simulat Engn Biomimet & Prototype, POB 812, Yaounde, Cameroon
[5] Univ Yaounde I, Fac Sci, Dept Phys, TWAS Res Unit, POB 812, Yaounde, Cameroon
[6] Vrije Univ Brussel, Appl Phys Res Grp APHY, Pl Laan 2, B-1050 Brussels, Belgium