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Presence is a service that allows a user to be informed about the reachability, availability, and willingness to communicate of another user. Presence service has become a key enabler for many popular applications such as instant messaging and push-to-talk. However a study shows that presence service can account for 50% or more of the total signalling(More)
Due to high dynamic computing environments of ubiquitous computing, it poses many challenges for software middleware technologies. The component-based middleware systems should possess self-adjusting functions for adapt to internal and external environments variation. This paper firstly describes a middleware called SCUDWare for smart vehicle space in(More)
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