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Deriving deadline and period for update transactions to maintain temporal consistency has long been recognized as an important problem in real-time database research. Despite years of active study, most of the past work only focuses on the scheduling of update transactions, and neglects the impact of control transactions by assuming an Update First policy where control transactions are always assigned...
This paper studies the problem of scheduling preemptable queries with relative consistency constraints when the absolute consistency for real-time data objects is preserved. The single query schedule problem is studied first, then the multiple queries scheduling problem. An optimal algorithm and several heuristics for scheduling multiple queries are proposed. Experiments are also conducted to compare...
With the increasing popularity of wireless sensor network and GPS technologies, uncertain data as a new type of data bring new challenge for the data processing methods. Data broadcasting is an effective means for data dissemination in mobile computing environment. Definition of the mean uncertainty ratio of data is presented and a broadcasting scheme UDBS is proposed for uncertain data dissemination...
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