20210207004300.0 Proceedings of the ICECRS (Online) 2548-6160 Proceedings of the ICECRS Proceedings of the ICECRS (Online) 2548-6160 Indonesia Proceedings of the ICECRS 2548-6160 http://ojs.umsida.ac.id/index.php/icecrs 2548-6160 2548-6160