This paper does linear and nonlinear research on the medical indexes and geographical factors, thus the complex linear model and the nonlinear BP neural network model between them are established.
对医学指标与这些地理学指标进行了线性和非线性的研究，从而建立它们之间的复杂线性模型和非线性BP神经网络模型。
A switching function method is proposed in this paper to describe the network of railway yard and construct a switching network model of geographical circuitry.
采用开关函数对铁路站场网络进行描述，构造出站场网络模型。
Network model: geographical objects have been abstracted by chain and node etc. , pay attention to the connective relationship among them.
网络模型：地物被抽象为链，节点等对象，同时要注意其连通关系。
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