在实际系统中，无源性是系统耗散性概念的一个特例。无源性正是供给率为输入输出信号之乘积形式的特例。

We consider passivity of system, a special class of dissipative systems, in which supply rate is represented by the product of the system input and output.

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首先介绍了神经网络的基本概念，接着给出了神经网络的具体结构和输入输出单元的设计方案。

First, the basic concept of nerve net has been introduced. And then the detail structure of the BP nerve net and the detail design precept of input and output layer have been given.

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