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Investigation of a city-scale three-dimensional Macroscopic Fundamental Diagram for bi-modal urban traffic 城市尺度双模式交通三维宏观基本图研究
Pub Date : 2013-10-01 DOI: 10.1109/ITSC.2013.6728367
Nan Zheng, K. Aboudolas, N. Geroliminis
Recent research has demonstrated that the Macroscopic Fundamental Diagram (MFD) is reliable and practical tool for modeling traffic dynamics and network performance in single-mode (cars only) urban road networks. In this paper, we first extend the modeling of the single-mode MFD to a bi-modal (bus and cars) one. Based on simulated data, we develop a three-dimensional MFD (3D-MFD) relating the accumulation of cars and buses, and the total circulating flow in the network. We propose an exponential function to capture the shape of the 3D-MFD, which shows a good fit to the data. We also propose an elegant estimation for passenger car equivalent of buses (PCU), which has a physical meaning and depends on the bi-modal traffic in the network. Moreover, we analyze a 3D-MFD for passenger network flows and derive its analytical function. Finally, we investigate an MFD for networks with dedicated bus lanes and the relationship between the shape of the MFD and the operational characteristics of buses. The output of this paper is an extended 3D-MFD model that can be used to (i) monitor traffic performance and, (ii) develop various traffic management strategies in bi-modal urban road networks, such as redistribution of urban space among different modes, perimeter control, and bus priority strategies.
最近的研究表明,宏观基本图(MFD)是单模(仅限汽车)城市道路网络交通动力学和网络性能建模的可靠和实用的工具。在本文中,我们首先将单模MFD的建模扩展到双模态(总线和汽车)模型。在模拟数据的基础上,我们建立了一个三维MFD (3D-MFD),将汽车和公共汽车的积累与网络中的总循环流量联系起来。我们提出了一个指数函数来捕捉3D-MFD的形状,它显示出很好的拟合数据。我们还提出了客车当量(PCU)的优雅估计,PCU具有物理意义,并取决于网络中的双模式交通。此外,我们还分析了客运网络流的三维mfd,并推导了其分析函数。最后,我们研究了具有专用公交车道网络的MFD以及MFD形状与公交运行特性之间的关系。本文的输出是一个扩展的3D-MFD模型,可用于(i)监测交通性能,(ii)在双式城市道路网络中制定各种交通管理策略,例如在不同模式之间重新分配城市空间,周界控制和公交车优先策略。
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引用次数: 5
Research on compressed EKF based SLAM algorithm for unmanned underwater vehicle 基于压缩EKF的无人潜航器SLAM算法研究
Pub Date : 2012-10-25 DOI: 10.1109/ITSC.2012.6338834
Hongjian Wang, Cun Li, Hongli Lv, Xinghua Chen
The Extend Kalman Filter based algorithm for simultaneous localization and mapping cannot satisfy the requirement of real time map updating because of the increasing number of landmarks and the heavy calculating cost while AUV working for long time endurance. The Compressed EKF based SLAM is introduced in this paper. And the method of map management and the local map switch strategy are addressed, which divide the AUV navigating area into several local sub-maps. The navigation error calculating based on landmarks in sub-map is completed in local area by using Extend Kalman filter, and the global map updating is done only when the condition satisfied the switch rule of the sub-map. Finally the CEKF-SLAM based navigating method is tested with the trial data, and by comparing with the dead reckoning navigating result, the test results show that the navigation error of CEKF-SLAM algorithm is less than that of dead reckoning algorithm, and on the same time, the former reduces the calculation cost for AUV navigation.
基于扩展卡尔曼滤波的同时定位和映射算法在水下航行器长时间工作时,由于地标数量增加和计算量大,无法满足实时更新地图的要求。本文介绍了基于压缩EKF的SLAM算法。研究了地图管理方法和局部地图切换策略,将水下航行器导航区域划分为若干局部子地图。利用扩展卡尔曼滤波在局部区域完成基于子地图中地标的导航误差计算,只有当条件满足子地图的切换规则时才进行全局地图更新。最后用试验数据对基于CEKF-SLAM的导航方法进行了测试,通过与航位推算导航结果的比较,测试结果表明CEKF-SLAM算法的导航误差小于航位推算算法,同时降低了水下航行器导航的计算成本。
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引用次数: 3
Application of reinforcement learning with continuous state space to ramp metering in real-world conditions 连续状态空间强化学习在匝道测量中的应用
Pub Date : 2012-10-25 DOI: 10.1109/ITSC.2012.6338837
K. Rezaee, B. Abdulhai, H. Abdelgawad
In this paper we introduce a new approach to Freeway Ramp Metering (RM) based on Reinforcement Learning (RL) with focus on real-life experiments in a case study in the City of Toronto. Typical RL methods consider discrete state representation that lead to slow convergence in complex problems. Continuous representation of state space has the potential to significantly improve the learning speed and therefore enables tackling large-scale complex problems. A robust approach based on local regression, named k nearest neighbors temporal difference (kNN-TD), is employed to represent state space continuously in the RL environment. The performance of the new algorithm is compared against the ALINEA controller and typical RL methods using a micro-simulation testbed in Paramics. The results show that RM using the kNN-TD method can reduce total network travel time by 44% compared to the do-nothing case (without RM) and by 17% compared to ALINEA.
在本文中,我们介绍了一种基于强化学习(RL)的高速公路匝道计量(RM)的新方法,并以多伦多市为例进行了实际实验研究。典型的强化学习方法考虑离散状态表示,导致复杂问题的缓慢收敛。状态空间的连续表示具有显著提高学习速度的潜力,因此能够解决大规模的复杂问题。采用一种基于局部回归的鲁棒方法k近邻时间差分(kNN-TD)来连续表示RL环境下的状态空间。在Paramics的微仿真试验台上,将新算法的性能与ALINEA控制器和典型RL方法进行了比较。结果表明,使用kNN-TD方法的RM与不做任何事情(不做RM)相比可减少44%的总网络旅行时间,与ALINEA相比可减少17%的总网络旅行时间。
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引用次数: 28
Emergency traffic evacuation control based on the orthogonal experimental design method 基于正交试验设计方法的应急交通疏散控制
Pub Date : 2012-10-25 DOI: 10.1109/ITSC.2012.6338882
Yisheng Lv, F. Zhu, Q. Miao, Peijun Ye, Songhang Chen
Evacuees' behaviors have a significant impact on evacuation efficiency. Evacuation clearance time is one of the key indicators in the evacuation planning and management. Evacuees' departure time choice, destination choice and route choice behavior based on real-time traffic information are three crucial factors used to estimate evacuation clearance time. In this paper, we use the orthogonal experimental design method to determine values of these three factors simultaneously, which can reduce evacuation clearance time significantly. Once we obtain these values, we can guide evacuees' departure time choice, destination choice and route choice behavior to approximate these values and evacuation efficiency will improve greatly. The dynamic traffic evacuation process is modeled using a rule-based multi-agent microscopic traffic simulation system called TransWorld. The simulation experiment results illustrate the effectiveness and reliability of the proposed method. The proposed methodology, computational results and discussions can be used for future emergency evacuation planning and management.
疏散人员的行为对疏散效率有显著影响。疏散间隙时间是疏散规划和管理的关键指标之一。基于实时交通信息的疏散人员出发时间选择、目的地选择和路径选择行为是估算疏散间隙时间的三个关键因素。本文采用正交试验设计方法,同时确定这三个因素的取值,可以显著缩短疏散间隙时间。一旦得到这些值,就可以指导疏散人员的出发时间选择、目的地选择和路线选择行为接近这些值,疏散效率将大大提高。采用基于规则的多智能体微观交通仿真系统TransWorld对动态交通疏散过程进行建模。仿真实验结果验证了该方法的有效性和可靠性。所提出的方法、计算结果和讨论可用于未来的紧急疏散规划和管理。
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引用次数: 2
Optimized two-stage fuzzy control for urban traffic signals at isolated intersection and Paramics simulation 孤立交叉口交通信号优化两阶段模糊控制及Paramics仿真
Pub Date : 2012-09-01 DOI: 10.1109/ITSC.2012.6338691
Wenchen Yang, Lun Zhang, Zhaocheng He, Lijian Zhuang
This paper presents two adaptive two-stage fuzzy controllers for traffic signals at isolated intersections. Firstly, a two-stage combination fuzzy controller is designed. For traffic status variables in two-stage controller leading to the inefficiency of traffic states weakening under low traffic flow, the controller introduces 0–1 combination and determines the combination of traffic status variables of fuzzy controller's inputs from the perspective of structural optimization. Secondly, aiming at the problems of fuzzy controller parameter empirical settings and functional disability of learning, a two-stage fuzzy logic traffic signal controller with online optimization is proposed; this controller introduces the rolling horizon framework and optimizes the parameters of membership functions and controller rules by using hybrid genetic algorithm. The performance of two proposed models is validated via online Paramics-based simulation platform, and extensive simulation tests have demonstrated the potential of developed controllers for adaptive traffic signal control.
针对孤立交叉口的交通信号,提出了两种自适应两级模糊控制器。首先,设计了两级组合模糊控制器。对于两阶段控制器中导致低交通流量下交通状态弱化无效的交通状态变量,控制器引入0-1组合,从结构优化的角度确定模糊控制器输入的交通状态变量组合。其次,针对模糊控制器参数经验整定和学习功能失能的问题,提出了一种在线优化的两阶段模糊交通信号控制器;该控制器引入滚动地平线框架,采用混合遗传算法对隶属函数参数和控制器规则进行优化。通过基于paramics的在线仿真平台验证了所提出的两种模型的性能,并进行了大量的仿真测试,证明了所开发的控制器在自适应交通信号控制方面的潜力。
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引用次数: 19
Welcome message from conference general chair 大会主席致欢迎辞
Pub Date : 2010-11-09 DOI: 10.1109/ITSC.2010.5625508
U. Nunes
It is my pleasure to welcome you to the 13th International IEEE Conference on Intelligent Transportation Systems, hosted in Funchal - Madeira Island, Portugal. This flagship conference of the IEEE Intelligent Transportation Systems Society is a leading forum where the state-of-the-art, the latest developments as well as future perspectives relating to intelligent transportation systems are presented and discussed. This IEEE ITSC 2010 conference covers a wide range of topics related to safe, efficient, clean, and intelligent sustainable mobility; including ITS theory, new ITS technology and applications, and ITS societal/environmental impacts.
我很高兴欢迎大家参加在葡萄牙丰沙尔-马德拉岛举办的第13届国际IEEE智能交通系统会议。这是IEEE智能交通系统协会的旗舰会议,是一个领先的论坛,在这里展示和讨论了与智能交通系统有关的最先进的、最新的发展以及未来的前景。本次IEEE ITSC 2010会议涵盖了与安全、高效、清洁和智能可持续移动相关的广泛主题;包括智能交通理论、新的智能交通技术和应用,以及智能交通对社会/环境的影响。
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引用次数: 0
ELA - an exit lane assistant for adaptive cruise control and navigation systems ELA -自适应巡航控制和导航系统的出口车道助手
Pub Date : 2010-11-09 DOI: 10.1109/ITSC.2010.5625216
S. Hold, S. Görmer, A. Kummert, M. Meuter, Stefan Müller-Schneiders
This paper presents a new application, the Exit Lane Assistant (ELA), based on a novel and robust vision-based classifier of lane boundary types. Using the knowledge that the exit lane is separated by a special lane boundary type from the other lanes, the intention of leaving the motorway can be recognized by classifying the type of the crossed lane boundaries. Therefore, lane markings are detected at predefined vertical coordinates in the image, so-called scanlines. The detection results, lane marking detected or not detected, are saved into a one-dimensional time-series for each scanline and lane boundary. Based on a Fourier analysis of the set of time series, features are extracted and compared with the theoretic values for the different boundary types using a nearest-neighbor classifier. The lane boundary type is determined fusing the classification results of each scanline based on their confidence. The exit lane ist finally recognized by a rule-based fusion with a digital map.
本文提出了一种新的应用——出口车道辅助(ELA),它基于一种新颖的、鲁棒的基于视觉的车道边界类型分类器。利用出口车道被一种特殊的车道边界类型与其他车道隔开的知识,通过对穿过的车道边界类型进行分类,可以识别出驶离高速公路的意图。因此,车道标记是在图像中预定义的垂直坐标处检测到的,即所谓的扫描线。检测结果(检测到或未检测到车道标记)保存为每个扫描线和车道边界的一维时间序列。在对时间序列集进行傅里叶分析的基础上,提取不同边界类型的特征,并使用最近邻分类器与理论值进行比较。基于置信度,融合各扫描线的分类结果确定车道边界类型。出口车道列表最终被基于规则的数字地图融合识别。
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引用次数: 12
Analysis of reservation algorithms for cooperative planning at intersections 交叉口协同规划预留算法分析
Pub Date : 2010-11-09 DOI: 10.1109/ITSC.2010.5624978
A. D. L. Fortelle
Intersections concentrate a too important number of accidents. It is quite obvious they are dangerous places because it is where cars potentially collide due to intersecting trajectories, as opposed to “normal” roads where they are parallel. This paper present a framework designed initially for cybercars (fully automated cars) but that could also be applied — though with major differences — to human driven cars. It is a world where vehicles have to reserve pieces of roads to cross a junction. This work is an enhancement of a previous work that demonstrated the feasibility of such a reservation algorithm.
十字路口集中了大量的交通事故。很明显,它们是危险的地方,因为它们是汽车可能发生碰撞的地方,因为它们的轨迹相交,而不是“正常”的道路,它们是平行的。这篇论文提出了一个最初为网络汽车(全自动汽车)设计的框架,但也可以应用于人类驾驶的汽车,尽管有很大的不同。在这个世界里,车辆必须预留一些道路才能穿过交叉路口。这项工作是对先前证明这种保留算法可行性的工作的改进。
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引用次数: 69
Smart grid and electric transportation 智能电网和电力运输
Pub Date : 2009-11-06 DOI: 10.1109/ITSC.2009.5309888
G. Venayagamoorthy, Scott Belcher
The modern electric power grid with wind energy is a complex adaptive system under semiautonomous distributed control. It is spatially and temporally complex, non-convex, nonlinear and nonstationary with a lot of uncertainties. The integration of plug-in hybrid and electric vehicles increases the complexity and challenges to the various controllers at all levels of the power grid. Charging large number of electric vehicles randomly or simultaneously without an intelligent infrastructure will increase the load on the electric grid causing adverse effects and increase in cost of electric vehicle usage. Intelligent scheduling of vehicles for charging and dynamic load forecasting will become of vital importance. On the other hand, electric vehicles with the use of vehicle-to-grid technology (gridable vehicles), information technology and advanced computational methods can make the electric grid efficient, reliable, distributed, clean and interoperable. This plenary talk will present some challenges to electric transportation and possible solutions, and the potentials of electric transportation in the smart grid.
现代风能电网是一个半自治分布式控制下的复杂自适应系统。它具有时空复杂性、非凸性、非线性和非平稳性,具有大量的不确定性。插电式混合动力汽车和电动汽车的融合增加了电网各级各种控制器的复杂性和挑战。在没有智能基础设施的情况下,对大量电动汽车进行随机或同时充电,会增加电网的负荷,造成不良影响,增加电动汽车的使用成本。智能车辆充电调度和动态负荷预测将变得至关重要。另一方面,电动汽车利用车到网技术(gridable vehicle)、信息技术和先进的计算方法,可以使电网高效、可靠、分布式、清洁和可互操作。本次全体会议将介绍电力运输面临的一些挑战和可能的解决方案,以及电力运输在智能电网中的潜力。
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引用次数: 8
Towards an Artificial Traffic Control System 一种人工交通控制系统
Pub Date : 2008-12-30 DOI: 10.1109/ITSC.2008.4732719
R. Rossetti, Paulo A. F. Ferreira, Rodrigo A. M. Braga, E. Oliveira
This work reports on the use of the concept of artificial transportation systems to implement a framework to allow the specification and test of new generation intelligent traffic control systems. A JADE implementation of a real agent application is linked to a virtual traffic domain to test control behaviour of traffic semaphores. Mixing reality and virtual environments is expected to foster the development of new generation of urban transport solutions. First experiments were carried out, which demonstrated the feasibility of the approach.
这项工作报告了利用人工交通系统的概念来实施一个框架,以便对新一代智能交通控制系统进行规范和测试。将真实代理应用程序的JADE实现链接到虚拟流量域,以测试流量信号量的控制行为。混合现实和虚拟环境有望促进新一代城市交通解决方案的发展。进行了初步实验,验证了该方法的可行性。
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引用次数: 23
期刊
International Conference on Intelligent Transportation Systems
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