Hee Yong Youn We-Duke Cho UbiComp 2008: Ubiquitous Computing, 10th International Conference, UbiComp 2008, Seoul, Korea, September 21-24, 2008, Proceedings UbiComp ACM International Conference Proceeding Series 344 ACM 2008 978-1-60558-136-1 db/conf/huc/ubicomp2008.html