Context-Aware Systems and Applications : First International Conference, ICCASA 2012, Ho Chi Minh City, Vietnam, November 26-27, 2012, Revised Selected Papers - Phan Cong Vinh, Nguyen Manh Hung, Nguyen Thanh Tung, Junichi Suzuki ((Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering))