1. Universitas Muhammadiyah Yogyakarta,Faculty of Engineering,Department of Electrical Engineering,D.I. Yogyakarta,Indonesia
2. Universiti Malaysia Perlis (UniMAP) Pauh Putra Campus,Faculty of Electrical Engineering Technology,Arau,Malaysia,02600
3. Universiti Sains Malaysia,Department of Microbiology and Parasitology,Kelantan,Malaysia