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中文摘要：
通过细化分析了NaSch模型的微观机理，发现原NaSch模型只适用于时间步长和最小时间距相同的情况，而且流量偏小实际上不是NaSch模型的缺陷，而是在计算时候取的最小时间距（时间步长）要比实际的偏大。通过统一量纲进行了修正，并引进参数k。通过参数k，新模型可以有效地讨论时间距问题。
英文摘要：
The microcosmic mechanism of NaSch model was analysed by segmentation. It＇s found that NaSch model can only be used when the stap of time is the same to the minimum time headways, and the low flow is not caused by the defects of NaSch model,but because the minimum time headways used to Calculate is larger than reality. Thus the NaSch model is modified through unifying the demension and parameter k is introduced. Through the parameter k, time headways can be dicussed effectively in this modified model.
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