Hiroyuki Yamahara Fumiko Harada Hideyuki Takada Hiromitsu Shimakawa Personalizing Threshold Values on Behavior Detection with Collaborative Filtering. 411-425 2008 UIC http://dx.doi.org/10.1007/978-3-540-69293-5_33 conf/uic/2008 db/conf/uic/uic2008.html#YamaharaHTS08