Context-Aware Systems and Applications, and Nature of Computation and Communication 7th EAI International Conference, ICCASA 2018, and 4th EAI International Conference, ICTCC 2018, Viet Tri City, Vietnam, November 22-23, 2018, Proceedings - Cong Vinh, Phan; Cong Vinh, Phan; Alagar, Vangalur; Alagar, Vangalur (Springer International Publishing : Imprint: Springer, 2019)