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Radio Frequency Identification systems present some functioning difficulties which are very discussed by the developers, such as the collisions of simultaneous tags communication, electro-magnetic interferences, ideal positioning of the tags regarding to the interrogator antennas and the amount of interrogator antennas. RFID technology has been employed in many WSD systems throughout the years. As, for instance, RFID tags were utilized as a type of network node position. The authors presented an RFID and WSN-based implementation of workflow optimization in warehouses, aiming to solve the problem of fulfilling an order that involves the retrieval of items that are stored among a large number of shelves scattered through out a warehouse in an optimal manner.
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