此部分是本文研究的重点：首先，建立有时间窗物流配送路径优化问题的数学模型基础。
Research on the paper will importantly focus on:Firstly, we will construct the mathematic model of optimizing of physical distribution routing problem with time windows.
通过对物流车辆配送过程的分析，建立了带时间窗约束的物流配送路径优化问题的数学模型。
A mathematical model of logistics distribution route with time window was proposed according to the analysis of the logistics vehicle distribution process.
路径优化是物流配送中智能调度系统的核心问题，其中最典型的问题模型就是旅行商问题即TSP问题。
As an essential question of the intelligent distribution system, route optimization has many problem-solving models, the most typical one is Traveling Salesman problem (short for TSP).
车辆路径问题是一类在物流配送调度中具有广泛应用的组合优化问题，属于强np难题。
Vehicle Routing problem (VRP) is a combination optimization problem in transportation logistics, which has been applied in many fields. It is a strong NP problem.
车辆路径问题是一类在物流配送调度中具有广泛应用的组合优化问题，属于强np难题。
Vehicle Routing problem (VRP) is a combination optimization problem in transportation logistics, which has been applied in many fields. It is a strong NP problem.
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