We employ an image identification algorithm for interactive museum guide with pictures taken by camera phones. Our algorithm is based on the shift-invariant feature transform (SIFT) algorithm. However, efficiency is a critical issue in the real-time interactive system, so a simplified version of SIFT algorithm is implemented in this work. Our testing database includes 33 paintings at the Cantor...

in this paper, a formal model for antivirus update agent system is presented based on mobile agent technology and predicate/transition petri nets. the mobile agent system contains two mobile agents called dca and una. it sends out agents to update antivirus on client computers in a network. each agent takes on a specified responsibility. first, dca roams through the network and check the last d...

As a nation built largely on knowledge – and facing unparalleled twenty-first century challenges – we require our citizens to constantly acquire new skills quickly, to engage in new learning approaches enthusiastically, and to form new learning communities that work well together. Yet most of our classrooms still look like nineteenth and early twentieth century schoolhouses: learning materials ...