This paper presents an optimed design method on decreasing node connectivity and test cost based on body theory in the systemlevel fault diagnosis.

在系统级故障诊断集团理论的基础上，提出了一种减少点连通度、降低测试成本的优化设计方法，研究了其一步可诊断的特性，并给出了一种优化设计算法。

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This paper reviews some optimed methods of BP neural network models, and formulates the classification of these methods. In addition, some related problems and further research work are suggested.

文中综述了BP神经网络模型的一些优化方法，并对这些方法进行了分析，最后提出了存在的问题和进一步的工作。

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This paper reviews some optimed methods of BP neural network models, and formulates the classification of these methods. In addition, some related problems and further research work are suggested.

文中综述了BP神经网络模型的一些优化方法，并对这些方法进行了分析，最后提出了存在的问题和进一步的工作。

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