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CEP(complex event processing) over RFID (radio frequency identification) data streams has become a new paradigm recently. Existing NFA (non-deterministic finite automata) based RFID event detection techniques assume single granularity RFID data (e.g., only item-level RFID readings) in the stream. In this paper, we consider CEP problems over multiple granularities RFID data streams (e.g., item-level,...
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