Yaacob, Siti Salwani (2022) Enhancing reliability in RFID complex event using hashed based approach. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Complex Event Processing (CEP) is a technology used to describe a mechanism for processing information from the raw data processing layer to higher-level data processing. Complex situations such as intrusion or business activity can lead to uncertain and unknown tags makes data stream become unreliable. In this research, hashed based approach is used as it is known for its efficient searching and better synchronization data structure. This research proposed two approaches using the hash-based techniques to enhance the CEP engine in the Radio Frequency Identification (RFID) distributed system. The first approach detects unknown tags from the raw data processing level. Existing solutions irrelevantly interrogate all the tags in the system. Hence, a novel unknown tag detection algorithm (SWOR) is proposed. The key novelty of this technique is to build an algorithm that uses a modified sliding window and bitwise XOR filter to avoid the interference of known tags to unknown tags. Real dataset from supermarket warehouse is used to detect unknown tags. The second approach detects the uncertain condition in the RFID CEP level. Previous approach such as probabilistic approach leads to high memory consumption and low detection efficiency of RFID event detection. To solve this issue, uncertain detection algorithm (UDA) approach was proposed. The proposed approach is based on the hashing and threadpool technique to solve long processing times, high memory consumption and low event throughput in the current processing approaches. Real dataset from pharmaceutical company is used to detect uncertain event. In this research, the research design is based on quantitative and using quasi-experimental method. Experimental results showed SWOR algorithm achieved the lowest false positive rate of 9.99% and the highest accuracy of 99.18% compared to other approaches. UDA algorithm is 3.2 times faster than the baseline approach and achieved 100% accuracy with low memory consumption compared to previous approaches. Thus, this study successfully proposed approaches to enhance the RFID CEP in the distributed system

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