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Radio frequency identification and wireless sensor networks are two important wireless technologies that have a wide variety of applications in current and future systems. RFID facilitates detection and identification of objects that are not easily detectable or distinguishable by using conventional sensor technologies. However, it does not provide information about the condition of the objects it detects. WSN, on the other hand, not only provides information about the condition of the objects and environment but also enables multi-hop wireless communications. Hence, the integration of these technologies expands their overall functionality and capacity. This paper investigates recent research work and applications that integrate RFID with sensor networks.
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