An, Thai, Le Long, Vuong Nhi, Vu Thien, Phung Hanh, Nguyen Thanh Hai, and Nguyen Minh. “Design of an Iot Check-in System Controlling the Ministry of Health’s 5k Regulation”. VNUHCM Journal of Engineering and Technology 6, no. SI2 (July 1, 2025). Accessed July 31, 2025. https://stdjet.scienceandtechnology.com.vn/index.php/stdjet/article/view/1115.