Qualitative process modelling: a fuzzy signed directed graph method

Abstract A qualitative process modelling method is presented which makes use of a fuzzy graph theory-based Signed Directed Graph (fuzzy-SDG) to represent the mathematical models governing the process systems. Two methods for solving problems in the domain are discused: node-to-node reasoning and a matrix method. The advantages of the methods are discussed and the effectiveness of the procedures is illustrated by reference to case studies.

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