Stability analysis on a dynamical model of route choice in a connected vehicle environment

Research on connected vehicle environment has been growing rapidly to investigate the effects of real-time exchange of kinetic information between vehicles and road condition information from the infrastructure through radio communication technologies. A fully connected vehicle environment can substantially reduce the latency in response caused by human perception-reaction time with the prospect of improving both safety and comfort. This study presents a dynamical model of route choice under a connected vehicle environment. We analyze the stability of headways by perturbing various factors in the microscopic traffic flow model and traffic flow dynamics in the car-following model and dynamical model of route choice. The advantage of this approach is that it complements the macroscopic traffic assignment model of route choice with microscopic elements that represent the important features of connected vehicles. The gaps between cars can be decreased and stabilized even in the presence of perturbations caused by incidents. The reduction in gaps will be helpful to optimize the traffic flow dynamics more easily with safe and stable conditions. The results show that the dynamics under the connected vehicle environment have equilibria. The approach presented in this study will be helpful to identify the important properties of a connected vehicle environment and to evaluate its benefits.     

违宪审查的启动机制

在当代中国，《宪法》、《立法法》关于违宪审查的规定虽然不够完善，但毕竟初步建立起了违宪审查制度。但是，在法治实践中却很少真正启动违宪审查程序。怎样启动违宪审查，是一个理论上需要迫切解决的问题。本正是从这一角度出发，探讨必须赋予公民违宪申诉权以启动违宪审查，达到维护法制统一，保障人民权利的目的。     

长江航路的改革与发展

航路改革是长江航运史上的一次革命,它规范了船舶航行秩序,大大降低了交通事故发生率,提高了通航效率。本文从航路改革的意义,作法,收益入手,重点对航路改革的发展进行了探讨,具有一定的实践指导意义。     

中俄国际交通走廊珲春国际港可行性分析

珲春市是"一带一路"东起点,也是吉林省借港出海唯一通道。滨海2号路线为长春—吉林—珲春—扎鲁比诺港,将吉林省与俄滨海边疆区海港连接起来,实现东北货物南运出境不出国。由于珲春—扎鲁比诺港路线尚处起步阶段,集疏运条件需要培育、磨合的过程,相较形成规模的渤海湾港口通道存在劣势。首先对标营口港路线运费标准,确定珲春节点具有经济性的腹地范围,再根据腹地企业确定相关货种,在保证完成浙吉两省合作任务的同时,确保项目的经济合理性。     

Modeling the day-to-day traffic evolution process after an unexpected network disruption

Although various approaches have been proposed for modeling day-to-day traffic flow evolution, none of them, to the best of our knowledge, have been validated for disrupted networks due to the lack of empirical observations. By carefully studying the driving behavioral changes after the collapse of I-35W Mississippi River Bridge in Minneapolis, Minnesota, we found that most of the existing day-to-day traffic assignment models would not be suitable for modeling the traffic evolution under network disruption, because they assume that drivers’ travel cost perception depends solely on their experiences from previous days. When a significant network change occurs unexpectedly, travelers’ past experience on a traffic network may not be entirely useful because the unexpected network change could disturb the traffic greatly. To remedy this, in this paper, we propose a prediction-correction model to describe the traffic equilibration process. A “predicted” flow pattern is constructed inside the model to accommodate the imperfect perception of congestion that is gradually corrected by actual travel experiences. We also prove rigorously that, under mild assumptions, the proposed prediction-correction process has the user equilibrium flow as a globally attractive point. The proposed model is calibrated and validated with the field data collected after the collapse of I-35W Bridge. This study bridges the gap between theoretical modeling and practical applications of day-to-day traffic equilibration approaches and furthers the understanding of traffic equilibration process after network disruption.     

处理大斜度简支板桥的一种实用方法

本文从高速公路工程施工角度出发,提出了处理大斜度简支板桥的一种经济简捷实用的方法＝墩、台顶设置异型块法。并给出了这种方法的工程应用实例。     

土工织物在道路工程中的应用

介绍了土工织物的种类,分析了土工织物的特性及其应用机理。     

进路信息数据表编制软件的优化设计方案

提出一种优化设计方案,引入信号平面图作为该编制软件的基础资料,通过自动获取平面图数据,构建站内多速度模型,实现进路数据编制的全面自动化。经工程设计实践证明,该方法操作简单,且能保证数据的准确性,极大地提高了工作效率。