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Automotive body styling appraisement is very important for body styling design. Because there is not tangible standard at the structure ascertaining of artificial neural network(ANN) and improvement of stability is needed for ANN inside black box characteristic, a bus-styling appraisement method using extension theory-based artificial neural network is presented. The key techniques of quasi-three-dimension bus-styling appraisement are investigated, including the idea and process of quasi-three-dimension bus-styling appraisement and the designing and training of extension theory-based artificial neural network model. Moreover, an expert software is developed to appraise bus styling. The effectiveness of the software is finally verified by a practical bus-styling task.

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