Hiroyuki Yamahara Hideyuki Takada Hiromitsu Shimakawa Behavior Detection Based on Touched Objects with Dynamic Threshold Determination Model. 142-158 2007 conf/eurossc/2007 EuroSSC http://dx.doi.org/10.1007/978-3-540-75696-5_9 db/conf/eurossc/eurossc2007.html#YamaharaTS07