Dong-Soo Kwon Yoon Keun Kwak Jong-Chan Park Myung Jin Chung Eun-Sook Jee Kyung-Sook Park Hyoung-Rock Kim Young-Min Kim Jong-Chan Park Eun Ho Kim Kyung Hak Hyun Hye-Jin Min Hui Sung Lee Jeong Woo Park Su Hun Jo Soon-Young Park Kyung-Won Lee Emotion Interaction System for a Service Robot. 351-356 2007 RO-MAN http://dx.doi.org/10.1109/ROMAN.2007.4415108 conf/ro-man/2007 db/conf/ro-man/ro-man2007.html#KwonKPCJPKKPKHMLPJPL07