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JACIII Vol.19 No.1 pp. 74-90
doi: 10.20965/jaciii.2015.p0074
(2015)

Paper:

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Inference with Fuzzy Rule Interpolation at an Infinite Number of Activating Points

Kiyohiko Uehara* and Kaoru Hirota**

*Ibaraki University, 4-12-1 Nakanarusawa-cho, Hitachi 316-8511, Japan

*Tokyo Institute of Technology, G3-49, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan

Received:
May 8, 2014
Accepted:
August 31, 2014
Published:
January 20, 2015
Creative Commons License
Keywords:
fuzzy inference, sparse fuzzy rules, fuzzy rule interpolation, nonlinear mapping, α-cut
Abstract
An inference method for sparse fuzzy rules is proposed which interpolates fuzzy rules at an infinite number of activating points and deduces consequences based on α-GEMII (α-level-set and generalized-mean-based inference). The activating points, proposed in this paper, are determined so as to activate interpolated fuzzy rules by each given fact. The proposed method is named α-GEMINAS (α-GEMII-based inference with fuzzy rule interpolation at an infinite number of activating points). α-GEMINAS solves the problem in infinite-level interpolation where fuzzy rules are interpolated at the least upper and greatest lower bounds of an infinite number of α-cuts of each given fact. The infinite-level interpolation can nonlinearly transform the shapes of given membership functions to those of deduced ones in accordance even with sparse fuzzy rules under some conditions. These conditions are, however, strict from a practical viewpoint. α-GEMINAS can deduce consequences without these conditions and provide nonlinear mapping comparable with infinite-level interpolation. Simulation results demonstrate these properties of α-GEMINAS. Thereby, it is found that α-GEMINAS is practical and applicable to a wide variety of fields.
Cite this article as:
K. Uehara and K. Hirota, “Inference with Fuzzy Rule Interpolation at an Infinite Number of Activating Points,” J. Adv. Comput. Intell. Intell. Inform., Vol.19 No.1, pp. 74-90, 2015.
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