Kwon, TaeWoo, Jong-Yong Lee, and Kye-Dong Jung. “Design of Falling Notification System Using Falling Situation and Geofencing Service”. International Journal of Engineering and Technology 7, no. 3.24 (August 10, 2018): 317–320. Accessed February 11, 2026. https://www.sciencepubco.com/index.php/IJET/article/view/22677.