Aberle说，“然而，NLST取得的数据可以用于建立数学模型，来确定影像学检查所需的最佳时长和频率。
However, the NLST data can be used to develop mathematical models to determine how long screening should be performed and how often.
针对常见的2～5个关键相位交叉口，首次给出了基于交通强度的周期时长优化模型。
The cycle length optimization model is proposed for intersections with 2~5 critical phases based on traffic intension.
在充分考虑信号交叉口混合交通特性的基础上，提出了信号交叉口周期时长、绿信比、绿灯时间间隔优化模型。
Considering the mixed traffic running characteristic on signalized intersection, this paper sets forth optimized cycle time, green ratio and green light interval model.
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