Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/84724
標題: Reduced Interval Type-2 Neural Fuzzy System UsingWeighted Bound-Set Boundary Operation forComputation Speedup and Chip Implementation
關鍵字: Distinguishable fuzzy sets, interpretable fuzzysystems;neural fuzzy systems (NFSs);type-2 fuzzy chips;type-2fuzzy systems;type reduction
Project: IEEE TRANSACTIONS ON FUZZY SYSTEMS, Volume 21, Issue 3.
摘要: 
This paper proposes a reduced interval type-2neural fuzzy system using weighted bound-set boundaries(RIT2NFS-WB) for the simplification of type-reduction operations.The objective of this simplification is to reduce the systemtraining time in software implementation and chip size inhardware implementation, especially when the number of rulesis large. The antecedent part in the RIT2NFS-WB uses intervaltype-2 fuzzy sets (IT2FSs), and the consequent part can be of theTakagi–Sugeno–Kang (TSK) or Mamdani type.The RIT2NFS-WBis built through an online structure and parameter learningto improve model accuracy. In addition, the interpretability ofthe RIT2NFS-WB is improved by considering distributions ofthe IT2FSs in input variables. A distinguishability-oriented costfunction is used in parameter learning to generate distinguishableIT2FSs and improve semantics-based interpretability. Forhighly overlapped IT2FSs, they are merged to reduce the numberof IT2FSs and improve complexity-based interpretability.The software-implemented TSK-type RIT2NFS-WB is hardwareimplementedon a field-programmable gate array chip. To acceleratethe chip execution speed, the chip utilizes not only the parallelexecution properties of fuzzy rules and bound-set boundaries butthe pipeline technique as well. In particular, the flexibility of thechip is considered so that no redesign of the circuits is requiredwhen the RIT2NFS-WB is applied to different problems. The characteristicsof the software- and hardware-implemented RIT2NFSWBare verified through various examples and comparisons withvarious type-1 and interval type-2 fuzzy models.
URI: http://hdl.handle.net/11455/84724
Appears in Collections:電機工程學系所

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