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http://dx.doi.org/10.3745/KIPSTA.2008.15-A.1.17

An Efficient Cache Mechanism for Improving Response Times in Integrated RFID Middleware  

Kim, Cheong-Ghil (연세대학교 컴퓨터과학과 BK21)
Lee, Jun-Hwan (연세대학교 컴퓨터과학과)
Park, Kyung-Lang (연세대학교 컴퓨터과학과)
Kim, Shin-Dug (연세대학교 컴퓨터과학과)
Publication Information
The KIPS Transactions:PartA / v.15A, no.1, 2008 , pp. 17-26 More about this Journal
Abstract
This paper proposes an efficient caching mechanism appropriate for the integrated RFID middleware which can integrate wireless sensor networks (WSNs) and RFID (radio frequency identification) systems. The operating environment of the integrated RFID middleware is expected to face the situations of a significant amount of data reading from RFID readers, constant stream data input from large numbers of autonomous sensor nodes, and queries from various applications to history data sensed before and stored in distributed storages. Consequently, an efficient middleware layer equipping with caching mechanism is inevitably necessary for low latency of request-response while processing both data stream from sensor networks and history data from distributed database. For this purpose, the proposed caching mechanism includes two optimization methods to reduce the overhead of data processing in RFID middleware based on the classical cache implementation polices. One is data stream cache (DSC) and the other is history data cache (HDC), according to the structure of data request. We conduct a number of simulation experiments under different parameters and the results show that the proposed caching mechanism contributes considerably to fast request-response times.
Keywords
RFID; WSN; Middleware; Cache; Response Time; Data Stream;
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