Hae-Sun Jung Chang-Sung Jeong Yongwoo Lee Phil Doo Hong An Intelligent Ubiquitous Middleware for U-City: SmartUM. 375-388 2009 25 J. Inf. Sci. Eng. 2 http://www.iis.sinica.edu.tw/page/jise/2009/200903_03.html db/journals/jise/jise25.html#JungJLH09