Minsoo Lee Yoonsik Uhm Zion Hwang Yong Kim Joohyung Jo Sehyun Park A Ubiquitous Computing Network Framework for Assisting People in Urban Areas. 215-216 2007 conf/lcn/2007 LCN http://doi.ieeecomputersociety.org/10.1109/LCN.2007.22 db/conf/lcn/lcn2007.html#LeeUHKJP07