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首页> 外文期刊>Mathematical Problems in Engineering: Theory, Methods and Applications >A Capacity-Restraint Transit Assignment Model When a Predetermination Method Indicates the Invalidity of Time Independence
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A Capacity-Restraint Transit Assignment Model When a Predetermination Method Indicates the Invalidity of Time Independence

机译：当预定方法表明时间独立性无效时的容量约束运输分配模型

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摘要

The statistical independence of time of every two adjacent bus links plays a crucial role in deciding the feasibility of using many mathematical models to analyze urban transit networks. Traditional research generally ignores the time independence that acts as the ground of their models. Assumption is usually made that time independence of every two adjacent links is sound. This is, however, actually groundless and probably causes problematic conclusions reached by corresponding models. Many transit assignment models such as multinomial probit-based models lose their effects when the time independence is not valid. In this paper, a simple method to predetermine the time independence is proposed. Based on the predetermination method, a modified capacity-restraint transit assignment method aimed at engineering practice is put forward and tested through a small contrived network and a case study in Nanjing city, China, respectively. It is found that the slope of regression equation between the mean and standard deviation of normal distribution acts as the indicator of time independence at the same time. Besides, our modified assignment method performs better than the traditional one with more reasonable results while keeping the property of simplicity well.
机译：在确定使用许多数学模型分析城市公交网络的可行性时，每两个相邻公交线路的时间统计独立性至关重要。传统研究通常忽略作为模型基础的时间独立性。通常假设每两个相邻链接的时间独立性是合理的。但是，这实际上是毫无根据的，并且可能导致相应模型得出的结论有问题。当时间独立性无效时，许多运输分配模型（例如基于多项式概率模型的模型）会失去作用。本文提出了一种确定时间独立性的简单方法。基于这种预先确定的方法，提出了一种针对工程实践的改进的容量约束运输分配方法，并分别通过一个小型人为网络和一个以南京市为例的案例进行了测试。发现正态分布的均值与标准差之间的回归方程斜率同时作为时间独立性的指标。此外，我们改进的赋值方法在保持简单性的同时，比传统方法具有更好的效果，并且结果更加合理。

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