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

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

WARDS 2018: Proceedings of the 1st Warmadewa Research and Development Seminar (WARDS),30 October 2018, Denpasar-Bali, Indonesia