Proceedings of the International Conference on Natural Resources and Technology Acronym: ICONART 2019 Event held on: March 12-13, 2019, in Medan, Indonesia Editors: Mohammad Basyuni 1 , Bejo Slamet 1 , Arida Susilowati 1 , Nurdin Sulistiyono 1 , Hirosuke Oku 2 , Seung-Hwan Lee 3 and Nik Meriam Nik Sulaiman 4 Affiliations: 1 Universitas Sumatera Utara, Indonesia , 2 University of the Ryukyus, Japan , 3 Kangwon National University, Korea, Republic of , 4 University of Malaya, Malaysia ISBN: 978-989-758-404-6