Ambient Intelligence : Second International Joint Conference, AmI 2011, Amsterdam, The Netherlands, November 16-18, 2011, Proceedings - David V. Keyson, Mary Lou Maher, Norbert Streitz, Adrian Cheok, Juan Carlos Augusto, Reiner Wichert, Gwenn Englebienne, Hamid Aghajan, . Ben J. A. Kröse ((Lecture Notes in Computer Science))