Hokyum Kim Insuk Park Soon J. Hyun Dongman Lee Dynamic Activity Lifecycle Management in Ubiquitous Computing Environments. 985-990 2007 CIT http://doi.ieeecomputersociety.org/10.1109/CIT.2007.92 conf/IEEEcit/2007 db/conf/IEEEcit/IEEEcit2007.html#KimPHL07