1. Smart Power and Advanced Energy Systems Center, Center of Advanced Material for Renewable Energy, Universitas Negeri Malang,Electrical Engineering Department,Malang,Indonesia
2. Universitas Negeri Malang,Electrical Engineering Department,Malang,Indonesia
3. Universitas Negeri Malang,Department of Physics,Malang,Indonesia
4. Computer Science and Electrical Engineering, Kumamoto University,Kumamoto,Japan