在此基础上，对于物理网络，应用图的同调论原理，将网络模型唯一地对应到数学模型。
On the basis of this method, network models for physical networks correspond to mathematical models uniquely when a homology principle of the graph is applied.
电路网络法建模可以通过看电路图直接写出其传递函数形式的数学模型，键图法可以很容易地将机械转动系统的键图绘制出来。
The circuit network modeling method can directly write out a mathematical model in the form of its transfer function through reading its circuit diagram.
建立了求解铁路局范围内请求车审批优化的数学模型和与此模型对应的网络图，将铁路请求车审批优化问题转换为求解最小费用最大流问题。
This paper discusses the smallest cost problem on the undirection network, which has the upper limit of rate of flow, and sets up its mathematics model, and gives its relevant algorithm.
建立了求解铁路局范围内请求车审批优化的数学模型和与此模型对应的网络图，将铁路请求车审批优化问题转换为求解最小费用最大流问题。
We study uncapacitated version of the minimum cost flow problem of one-commodity and two-commodity with not only fixed cost but also variable cost, and give them each a polynomial algorithm.
建立了求解铁路局范围内请求车审批优化的数学模型和与此模型对应的网络图，将铁路请求车审批优化问题转换为求解最小费用最大流问题。
We study uncapacitated version of the minimum cost flow problem of one-commodity and two-commodity with not only fixed cost but also variable cost, and give them each a polynomial algorithm.
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