排序方式: 共有52条查询结果,搜索用时 15 毫秒
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以交通流率、速度和占有率为输入参数,采用交叉验证法优化模型惩罚参数C和核函数参数γ,建立以径向基为核函数的支持向量机模型,判断道路断面交通流状态;结合设计的道路网综合状态指数,依据自由流、拥挤流和阻塞流状态下占有率划分区间,构建城市快速路网交通流状态判别方法;最后以某一区域路网为例,进行了实证性研究.结果表明:该方法对道路断面交通流状态判别精度可达92.22%;同时能够实现道路网范围内对自由流、拥挤流和阻塞流状态的判别,判别精度可达86.67%. 相似文献
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Chunfu SHAO Yi ZHAO Lei YU Juan XU 《Journal of Transportation Systems Engineering and Information Technology》2008,8(6):52-55
As the main venue of the 2008 Beijing Olympic Games, the National Stadium hosted the opening and closing ceremonies, field and track events, and final football games. This paper intends to study the problems associated with vehicle evacuation from the parking lot, and develop evacuation plans. First, the paper analyzes the particular conditions of the parking lot in the National Stadium, as well as its layout and vehicle evacuation. Then, it simulates and evaluates the evacuation plans with the suitably given parameters, based on the real blueprint of the National Stadium and scenarios. Finally, it conducts a comparative analysis on the accuracy and practicability of the vehicle evacuation plans based on the field data collected at the opening ceremony of the Olympic Games. The simulation result shows that the total vehicle evacuation time was 26 minutes and the real evacuation time was 27 minutes on the day of the opening ceremony, which verifies that the study is accurate and practical. 相似文献
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Sun Mingdong Shao Chunfu Zhuge Chengxiang Wang Pinxi Yang Xiong Wang Shiqi 《Transportation》2022,49(5):1409-1439
Transportation - The market penetration rate of electric vehicle (EV) is on the rise globally. However, the use behaviors of private EVs have not been well understood, in part due to the lack of... 相似文献
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情景分析法在交通规划中的应用研究 总被引:1,自引:0,他引:1
运用情景分析法,综合考虑影响交通发展的5个主要因素,结合专家群体的知识与实际数据资料、各种信息与计算机技术以及数学模型与决策者的经验智慧,依次得到 相似文献
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运用弹性系数法预测北京机动车保有量 总被引:1,自引:0,他引:1
综述了机动车保有量的预测方法,包括时间序列回归法、神经网络法、弹性系数法等,分析了不同方法的特点,给出了相关启示。结合北京经济发展趋势,运用弹性系数法对机动车保有量进行了预测。 相似文献
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道路信号交叉口作为城市交通网络的重要节点,因交通运行复杂,是交通事故的集中发生地.为了降低交叉口事故发生的概率,并综合平衡各方面因素,科学地进行交通安全设计尤为重要.在多个设计方案比选过程中,综合决策模型的优劣直接决定了交通安全改善设计的实施效果.应用灰局势决策理论,选取交通事故折减系数(CRF)、工程费用、对绿化的影响、交叉口延误4项指标,结合专家打分确定各指标的权重,建立交通安全设计综合决策模型,并以实际交叉口的交通安全设计为例进行实证性研究. 相似文献