Ubiquitous computing and co-located workshops : UBIComp'11, proceedings of the 2011 ACM conference ; Large'11, MLBS'11, NoMe-IoT'11, PETMEI'11, RDURP'11, SAGAware'11, SCI'11, TDMA'11, UAAII'11, UbiCrowd'11 ; Beijing, China, September 17-21, 2011 (ACM - Association for Computing Machinery, 2011)