WESTECH 2018: Proceedings of 1st Workshop on Environmental Science, Society, and Technology, WESTECH 2018, December 8th, 2018, Medan, Indonesia

ACEIVE 2018: Proceedings of the 2nd Annual Conference of Engineering and Implementation on Vocational Education (ACEIVE 2018), 3rd November 2018, North Sumatra, Indonesia

ICOFEB 2018: Proceedings of the 1st International Conference on Finance Economics and Business, ICOFEB 2018, 12-13 November 2018, Lhokseumawe, Aceh, Indonesia