Kyungmin Cho Inseok Hwang Seungwoo Kang Byoungjip Kim Jinwon Lee Sang Jeong Lee Souneil Park Junehwa Song Yunseok Rhee HiCon: a hierarchical context monitoring and composition framework for next-generation context-aware services. 34-42 2008 22 IEEE Network 4 http://dx.doi.org/10.1109/MNET.2008.4579769 db/journals/network/network22.html#ChoHKKLLPSR08