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<p><it>Abstract</it>—A systematic approach has been developed to construct neural networks for qualitative analysis and reasoning. These neural networks are used as specialized parallel distributed processors for solving constraint satisfaction problems. A typical application of such a neural network is to determine a reasonable change of a system after one or more of its variables are changed. A six-node neural network is developed to represent fundamental qualitative relations. A larger neural network can be constructed hierarchically for a system to be modeled by using six-node neural networks as building blocks. The complexity of the neural network building process is thus kept manageable. An example of developing a neural network reasoning model for a transistor equivalent circuit is demonstrated. The use of this neural network model in the equivalent circuit parameter extraction process is also described.</p>
Knowledge representation, qualitative reasoning, constraint satisfaction, parallel distributed processing, neural networks, expert systems.

Z. Xu and M. Vai, "Representing Knowledge by Neural Networks for Qualitative Analysis and Reasoning," in IEEE Transactions on Knowledge & Data Engineering, vol. 7, no. , pp. 683-690, 1995.
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