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Título: Toward the paradigm of a knowledge based electromagnetic design system : a case based reasoning approach
Autores: Rong, Ruowen
Fecha: 1995
Publicador: McGill University - MCGILL
Fuente:
Tipo: Electronic Thesis or Dissertation
Tema: Engineering, Electronics and Electrical.
Descripción: Human designers use previous designs extensively in solving new design problems and Case-Based Reasoning (CBR) provides a knowledge representation paradigm which attempts to model such process. In this thesis we present a case-based approach to solving design problems by retrieving similar previous designs and adapting them to meet the new problem. A system called CBEDS (Case-Based Electromagnetic Design System) has been developed.
The thesis describes the knowledge organization for a case database which represents the semantic content of electromagnetic device designs and how to use feature extraction methods to reduce the indexing dimension of designs. A method based on interval constraint propagation has been developed to determine the valid range of design parameters. We argue that the adaptation of retrieved design cases requires an understanding of how the parameters of the device behave to accomplish the device's function. The thesis presents a case adaptation method which is based on algebraic constraint propagation and a primitive type of qualitative mathematical reasoning system which can predict how a change in one design parameter would affect the others. The advantage of our approach in building a knowledge based systems is the ease of adding new knowledge. Once a new design problem has been solved, it can be added to the case library updating the knowledge base. Such a system can be adaptive and will incrementally improve itself over time.
Idioma: en