42 research outputs found

    Coherence of radial implicative fuzzy systems with nominal consequents, Journal of Telecommunications and Information Technology, 2006, nr 4

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    In the paper we are interested in the question of coherence of radial implicative fuzzy systems with nominal consequents (radial I-FSs with NCs). Implicative fuzzy systems are fuzzy systems employing residuated fuzzy implications for representation of IF-THEN structure of their rules. Radial fuzzy systems are fuzzy systems exhibiting the radial property in antecedents of their rules. The property simplifies computational model of radial systems and makes the investigation of their properties more tractable. A fuzzy system has nominal consequents if its output is defined on a finite unordered set of possible actions which are generally quantitatively incomparable. The question of coherence is the question of under which conditions we are assured that regardless the input to the system is, an output of the system exists, i.e., the output is non-empty. In other words, a fuzzy system is coherent if it has no contradictory rules in its rule base. In the paper we state sufficient conditions for a radial I-FS with NCs to be coherent

    Journal of Telecommunications and Information Technology, 2006, nr 4

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    Bandler-Kohout Subproduct with Yager’s Families of Fuzzy Implications: A Comprehensive Study

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    Approximate reasoning schemes involving fuzzy sets are one of the best known applications of fuzzy logic in the wider sense. Fuzzy Inference Systems (FIS) or Fuzzy Inference Mechanisms (FIM) have many degrees of freedom, viz., the underlying fuzzy partition of the input and output spaces, the fuzzy logic operations employed, the fuzzification and defuzzification mechanism used, etc. This freedom gives rise to a variety of FIS with differing capabilities

    On the Suitability of the Bandler–Kohout Subproduct as an Inference Mechanism

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    Fuzzy relational inference (FRI) systems form an important part of approximate reasoning schemes using fuzzy sets. The compositional rule of inference (CRI), which was introduced by Zadeh, has attracted the most attention so far. In this paper, we show that the FRI scheme that is based on the Bandler-Kohout (BK) subproduct, along with a suitable realization of the fuzzy rules, possesses all the important properties that are cited in favor of using CRI, viz., equivalent and reasonable conditions for their solvability, their interpolative properties, and the preservation of the indistinguishability that may be inherent in the input fuzzy sets. Moreover, we show that under certain conditions, the equivalence of first-infer-then-aggregate (FITA) and first-aggregate-then-infer (FATI) inference strategies can be shown for the BK subproduct, much like in the case of CRI. Finally, by addressing the computational complexity that may exist in the BK subproduct, we suggest a hierarchical inferencing scheme. Thus, this paper shows that the BK-subproduct-based FRI is as effective and efficient as the CRI itself

    A semiotic evaluation of musical meaning in the works of Igor Stravinsky : decoding syntax and markedness and prototypicality theory.

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    SIGLEAvailable from British Library Document Supply Centre-DSC:DXN026379 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

    The repertory grid: a critical appraisal

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    George Kelly claims a scientific status for Personal Construct Theory, but I argue that it is more appropriately characterised among the interpretive human sciences. Examination of the theory from the point of view of the grid user discloses a number of weaknesses, the most directly relevant being Kelly's assumption of the dichotomous nature of constructs. Even when this assumption is weakened by allowing grading between oppositional poles, the grid matrix retains a positivism that appears at variance with the main thrust of Kelly's theorising. The central chapters appraise technical aspects of grid methodology, dealing sequentially with elements, constructs, bipolarity, the completion of a grid matrix, analysis, and the stability of grid data. Analysis of underlying assumptions, reflection upon the 'grid literature', and some empirical studies indicate that grid methodology is often flawed in both conceptualisation and practice. While some improvements may be made regarding technique, element X construct interactions radically undermine the grid as a research instrument, as does Kelly's later claim for the importance of events. I further argue that short verbal labels are inadequate to bear the load of meaning that respondents wish to convey, and that grid methodology excludes the richness of figurative language: developments based upon fuzzy set theory are unlikely to improve matters. If, as I suggest, communication of meaning is a prime requirement of construct theory research, then alternative approaches to the elicitation of constructs are necessary. I conclude by sketching a possible response to the criticisms that have been advanced, and argue for a 'personal construct hermeneutics' in which theory and method are brought into a closer alignment. Indications are given of how this might be operationalised in terms of 'accounts methodology' and of some of the implications for the conduct of research in the human sciences

    The repertory grid: a critical appraisal

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    George Kelly claims a scientific status for Personal Construct Theory, but I argue that it is more appropriately characterised among the interpretive human sciences. Examination of the theory from the point of view of the grid user discloses a number of weaknesses, the most directly relevant being Kelly's assumption of the dichotomous nature of constructs. Even when this assumption is weakened by allowing grading between oppositional poles, the grid matrix retains a positivism that appears at variance with the main thrust of Kelly's theorising. The central chapters appraise technical aspects of grid methodology, dealing sequentially with elements, constructs, bipolarity, the completion of a grid matrix, analysis, and the stability of grid data. Analysis of underlying assumptions, reflection upon the 'grid literature', and some empirical studies indicate that grid methodology is often flawed in both conceptualisation and practice. While some improvements may be made regarding technique, element X construct interactions radically undermine the grid as a research instrument, as does Kelly's later claim for the importance of events. I further argue that short verbal labels are inadequate to bear the load of meaning that respondents wish to convey, and that grid methodology excludes the richness of figurative language: developments based upon fuzzy set theory are unlikely to improve matters. If, as I suggest, communication of meaning is a prime requirement of construct theory research, then alternative approaches to the elicitation of constructs are necessary. I conclude by sketching a possible response to the criticisms that have been advanced, and argue for a 'personal construct hermeneutics' in which theory and method are brought into a closer alignment. Indications are given of how this might be operationalised in terms of 'accounts methodology' and of some of the implications for the conduct of research in the human sciences

    Mobile Robots Navigation

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    Mobile robots navigation includes different interrelated activities: (i) perception, as obtaining and interpreting sensory information; (ii) exploration, as the strategy that guides the robot to select the next direction to go; (iii) mapping, involving the construction of a spatial representation by using the sensory information perceived; (iv) localization, as the strategy to estimate the robot position within the spatial map; (v) path planning, as the strategy to find a path towards a goal location being optimal or not; and (vi) path execution, where motor actions are determined and adapted to environmental changes. The book addresses those activities by integrating results from the research work of several authors all over the world. Research cases are documented in 32 chapters organized within 7 categories next described
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