1. Faculty of Electrical and Electronic Engineering, University Tun Hussein Onn Malaysia, Batu Pahat, Malaysia
2. Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milan, Italy
3. Advanced High Voltage Engineering Research Centre, School of Engineering, Cardiff University, Cardiff, U.K.
4. Research and Development Department, Milim Syscon Company Ltd., Seongnam, South Korea