Sonya S. Kwak Eun Ho Kim Jimyung Kim Youngbin Son Inveom Kwak Jun-Shin Park Eun Wook Lee Field trials of the block-shaped edutainment robot hangulbot. 403-404 2012 HRI http://doi.acm.org/10.1145/2157689.2157819 conf/hri/2012 db/conf/hri/hri2012.html#KwakKKSKPL12