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