Samruan Wiangsamut Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen Thailand
Nawapak Eua-Anant Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen Thailand
Wutthichai Phornphatcharaphong Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen Thailand
