1. Lampung University,Environmental Science Graduate School,Department of Electrical Engineering and Informatics,Bandar Lampung,Indonesia
2. Lampung University,Faculty of Engineering,Department of Electrical Engineering and Informatics,Bandar Lampung,Indonesia
3. Lampung University Faculty of Mathematic and Natural Sciences,Department of Chemistry,Bandar Lampung,Indonesia
4. Lampung University,Faculty of Engineering,Department of Mechanical Engineering,Bandar Lampung,Indonesia