Stephen P. Tarzia, Robert P. Dick, Peter A. Dinda, Gokhan Memik. Sonar-based measurement of user presence and attention. In Sumi Helal, Hans Gellersen, Sunny Consolvo, editors, UbiComp 2009: Ubiquitous Computing, 11th International Conference, UbiComp 2009, Orlando, Florida, USA, September 30 - October 3, 2009, Proceedings. ACM International Conference Proceeding Series, pages 89-92, ACM, 2009. [doi]
Abstract is missing.