方法在扩大模型下，利用转换原理，通过定义邻域系单子给出拓扑的定义。
Methods In the enlargement model used transfer principle, the topology is defined by the monads of neighborhood.
通过巧妙地构造合并径路邻域系，设计优化合并径路分配方案的模拟退火算法，解决铁路OD分配的核心问题。
A simulated annealing algorithm for smartly structuring a neighbourhood system of the merge path and optimizing merge path assignment is used to solve the core problem of od assignment.
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