Ambient Intelligence : European Conference, AmI 2007, Darmstadt, Germany, November 7-10, 2007, Proceedings - Bernt Schiele, Anind K. Dey, Hans Gellersen, Boris Ruyter, Manfred Tscheligi, Reiner Wichert, Emile Aarts, . Alejandro Buchmann ((Lecture Notes in Computer Science))