Evolvable hardware design of combinational logic circuits.

Kalganova, Tatiana (2000) Evolvable hardware design of combinational logic circuits. PhD thesis, Edinburgh Napier University.

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    Evolvable Hardware (EHW), as an alternative method for logic design, became more
    attractive recently, because of its algebra-independent techniques for generating selfadaptive
    self-reconfigurable hardware. This thesis investigates and relates both evaluation
    and evolutionary processes, emphasizing the need to address problems arising
    from data complexity.
    Evaluation processes, capable of evolving cost-optimised fully functional circuits
    are investigated. The need for an extrinsic EHW approach (software models) independent
    of the concerns of any implementation technologies is emphasized. It is also
    shown how the function description may be adapted for use in the EHW approach.
    A number of issues of evaluation process are addressed: these include choice of optimisation
    criteria, multi-objective optimisation tedmiques in EHW and probabilistic
    analysis of evolutionary processes.
    The concept of self-adaptive extrinsic EHW method is developed. This approach
    emphasizes the circuit layout evolution together with circuit functionality. A chromosome
    representation for such system is introduced, and a number of genetic operators
    and evolutionary algorithms in support of this approach are presented. The genetic
    operators change the genetic material at the different levels of chromosome representation.
    Furthermore, a chromosome representation is adapted to the function-level
    EHW approach. As a result, the modularised systems are evolved using multi-output
    building blocks. This chromosome representation overcomes the problem of long
    string chromosome.
    Together, these techniques facilitate the construction of systems to evolve logic
    functions of large number of variables. A method for achieving this using bidirectional
    incremental evolution is documented. It is demonstrated that the integration of a
    dynamic evaluation process and self-adaptive function-level EHW approach allows
    the bidirectional incremental evolution to successfully evolve more complex systems
    than traditionally evolved before. Thereby it provides a firm foundation for the
    evolution of complex systems.
    Finally, the universality of these techniques is proved by applying them to multivalued
    combinational logic design. Empirical study of this application shows that
    there is no fundamental difference in approach for both binary and multi-valued logic
    design problems.

    Item Type: Thesis (PhD)
    Uncontrolled Keywords: Logic circuits; evolvable hardware; combinational logic design; complex systems;
    University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
    Dewey Decimal Subjects: 600 Technology > 620 Engineering > 621 Electronic & mechanical engineering > 621.3 Electrical & electronic engineering
    Library of Congress Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
    Item ID: 4341
    Depositing User: Mrs Lyn Gibson
    Date Deposited: 15 Apr 2011 14:55
    Last Modified: 15 Apr 2011 14:55

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