“…A system usually has a number of readers that forms a network to monitor the tags movement from one node to another (Dang, et al, 2009;Liu, et al, 2010b;Wang, Luo & Wong, 2010;Kim & Garrison, 2010). Besides reading tags, readers also can perform other functions such as writing data, setting password, locking data and killing tag (Dashevsky & Sokolov, 2009).…”