Use them for structural damage signals characteristic extraction, and signal extraction as neural network input, the introduction of three-tier network model BP damage to structures identification.
利用它们对结构损伤信号进行特征提取，并将提取的信号作为神经网络的输入，采用三层BP网络模型对结构物的损伤进行识别。
And then design a common core layer, convergence layer and access layer of the three-tier network architecture model, while applications for network scalability give some solutions.
然后设计了常用的核心层、汇聚层和接入层组成的三层网络架构模型，同时对于网络应用的可扩展性给出一些解决方案。
The access layer, which is the lowest level of the Cisco three tier network model, eures that packets are delivered to end user devices.
访问层，这是思科的最低水平三层网络模型，欧元，数据包交付给最终用户设备。
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