Traffic at urban intersections frequently encounters unexpected obstructions,resulting in congestion due to uncooperative and priority-based driving behavior.This paper presents an optimal right-turn coordination syst...Traffic at urban intersections frequently encounters unexpected obstructions,resulting in congestion due to uncooperative and priority-based driving behavior.This paper presents an optimal right-turn coordination system for Connected and Automated Vehicles(CAVs)at single-lane intersections,particularly in the context of left-hand side driving on roads.The goal is to facilitate smooth right turns for certain vehicles without creating bottlenecks.We consider that all approaching vehicles share relevant information through vehicular communications.The Intersection Coordination Unit(ICU)processes this information and communicates the optimal crossing or turning times to the vehicles.The primary objective of this coordination is to minimize overall traffic delays,which also helps improve the fuel consumption of vehicles.By considering information from upcoming vehicles at the intersection,the coordination system solves an optimization problem to determine the best timing for executing right turns,ultimately minimizing the total delay for all vehicles.The proposed coordination system is evaluated at a typical urban intersection,and its performance is compared to traditional traffic systems.Numerical simulation results indicate that the proposed coordination system significantly enhances the average traffic speed and fuel consumption compared to the traditional traffic system in various scenarios.展开更多
This article explores the intersections of Buddhism,Daoism,and contemporary French literary practice in the study of the everyday(quotidien).Since the 1980s,French literature has increasingly shifted its focus from th...This article explores the intersections of Buddhism,Daoism,and contemporary French literary practice in the study of the everyday(quotidien).Since the 1980s,French literature has increasingly shifted its focus from the exotic to the mundane,engaging with theoretical frameworks developed by scholars such as Henri Lefebvre and Michel de Certeau.Drawing on Buddhist notions of emptiness and dependent arising,as well as Daoist principles of yin-yang interdependence,the article bridges Eastern and Western philosophies to demonstrate the everyday not as a static or trivial backdrop,but as a dynamic and transformative space.It further examines how representations of daily life in the works of Georges Perec and Jacques Roubaud employ the meticulous documentation of mundane details to uncover hidden patterns,rhythms,and structures of human experience.Through literary fieldwork,Perec and Roubaud challenge conventional perceptions of the everyday,unveiling its depth,complexity,and potential for reinvention.展开更多
为了解交叉口车路协同领域的研究现状及未来研究热点,以Web of Science和CNKI数据库作为数据源,检索了2000年1月至2024年9月的427篇核心期刊文献。通过文献计量分析,从发文趋势、文献来源和关键词共词分析等角度进行了统计和可视化。统...为了解交叉口车路协同领域的研究现状及未来研究热点,以Web of Science和CNKI数据库作为数据源,检索了2000年1月至2024年9月的427篇核心期刊文献。通过文献计量分析,从发文趋势、文献来源和关键词共词分析等角度进行了统计和可视化。统计结果显示,近年来此领域的发文数量呈增长趋势,且样本文献具有较强的代表性。关键词共现分析表明,此领域的研究方向主要包括交叉口管控、路径与速度引导、信号-车辆协同优化、建模与仿真、多车交互安全、单一车辆安全、弱势道路使用者安全、网络通信和路侧感知。对以上研究方向的发展脉络以及具体方法进行了梳理和总结,并基于此展望了交叉口车路协同领域的未来研究热点。展开更多
多方隐私集合交集(Multiparty Private Set Intersection,MPSI)协议允许多个参与方各自持有私有集合,在不泄露除交集以外任何信息的前提下,安全计算所有集合的交集,在泄露凭证检查、金融反欺诈和联邦学习等领域具有广泛应用。然而,现有...多方隐私集合交集(Multiparty Private Set Intersection,MPSI)协议允许多个参与方各自持有私有集合,在不泄露除交集以外任何信息的前提下,安全计算所有集合的交集,在泄露凭证检查、金融反欺诈和联邦学习等领域具有广泛应用。然而,现有非平衡隐私集合交集协议主要针对两方参与场景,缺乏针对多方参与场景的高效解决方法。为了解决MPSI及其变体协议在非平衡数据集上效率低下的问题,本文提出一种非平衡双中心零共享的方法。该方法结合零共享和不经意键值存储技术,将多方非平衡计算归约为两方非平衡计算,有效降低了通信和计算开销。然后,通过将该方法和两方非平衡隐私集合交集及其变体协议相结合,构建了一种新的高效且可扩展的多方非平衡隐私集合交集(Multiparty Unbalanced Private Set Intersection, MUPSI)及其变体协议。实验结果表明,在相同条件下,客户端的集合规模为2^(10),服务器端的集合规模为2^(27)时,本文提出的MUPSI协议的服务器端在线阶段耗时比目前最优的协议缩短约20%。此外,在32个参与方的场景下,客户端的集合规模为2^(10),服务器端的集合规模为2^(27)时,客户端在线阶段耗时约10秒,验证了该协议在大规模参与方以及集合规模差异显著场景下的有效性。展开更多
Aiming at prevalent violations of non-motorists at urban intersections in China, this paper intends to clarify the characteristics and risks of non-motorist violations at signalized intersections through questionnaire...Aiming at prevalent violations of non-motorists at urban intersections in China, this paper intends to clarify the characteristics and risks of non-motorist violations at signalized intersections through questionnaires and video recordings, which may serve as a basis for non-motorized vehicle management. It can help improve the traffic order and enhance the degree of safety at signalized intersections. To obtain the perception information, a questionaire survey on the Internet was conducted and 972 valid questionnaires were returned. It is found that academic degree contributes little to non-motorist violations, while electrical bicyclists have a relatively higher frequency of violations compared with bicyclists. The video data of 18 228 non-motorist behaviors indicate that the violation rate of all non-motorists is 26.5%; the number of conflicts reaches 1 938, among which violation conflicts account for 66.8%. The study shows that the violation rates and the violation behavior at three types of surveyed intersections are markedly different. It is also concluded that the conflict rates and the violation rates are positively correlated. Furthermore, signal violation, traveling in the wrong direction, and overspeeding to cross the intersection are the most dangerous among traffic violation behaviors.展开更多
The pedestrian timing at signalized intersections is studied aiming at the problems of the inconsistency of the vehicular and pedestrian timing requirements and the insufficiency of pedestrian clearance. Based on the ...The pedestrian timing at signalized intersections is studied aiming at the problems of the inconsistency of the vehicular and pedestrian timing requirements and the insufficiency of pedestrian clearance. Based on the formulae of WALK and flashing DON＇T WALK （FDW） in the highway capacity manual （HCM）, the relationship between pedestrian signal indications and vehicular signal indications is discussed using the theory of traffic flow. Then, methods of pedestrian timing for different cases are established, particularly the methods of the pedestrian green adjustment. Ways of pedestrian crossing are analyzed for roadways with different forms and widths of the median island. The sampling values of calculation parameters are studied, and the recommended formulae of pedestrian timing for different conditions are presented.展开更多
基金supported by the Japan Society for the Promotion of Science(JSPS)Grants-in-Aid for Scientific Research(C)23K03898.
文摘Traffic at urban intersections frequently encounters unexpected obstructions,resulting in congestion due to uncooperative and priority-based driving behavior.This paper presents an optimal right-turn coordination system for Connected and Automated Vehicles(CAVs)at single-lane intersections,particularly in the context of left-hand side driving on roads.The goal is to facilitate smooth right turns for certain vehicles without creating bottlenecks.We consider that all approaching vehicles share relevant information through vehicular communications.The Intersection Coordination Unit(ICU)processes this information and communicates the optimal crossing or turning times to the vehicles.The primary objective of this coordination is to minimize overall traffic delays,which also helps improve the fuel consumption of vehicles.By considering information from upcoming vehicles at the intersection,the coordination system solves an optimization problem to determine the best timing for executing right turns,ultimately minimizing the total delay for all vehicles.The proposed coordination system is evaluated at a typical urban intersection,and its performance is compared to traditional traffic systems.Numerical simulation results indicate that the proposed coordination system significantly enhances the average traffic speed and fuel consumption compared to the traditional traffic system in various scenarios.
基金funded by Sichuan International Studies University within the framework of the research project“Oulipian Experimentalism and Spatial Structure in the Travel Narratives of Jacques Roubaud”(sisu202008).
文摘This article explores the intersections of Buddhism,Daoism,and contemporary French literary practice in the study of the everyday(quotidien).Since the 1980s,French literature has increasingly shifted its focus from the exotic to the mundane,engaging with theoretical frameworks developed by scholars such as Henri Lefebvre and Michel de Certeau.Drawing on Buddhist notions of emptiness and dependent arising,as well as Daoist principles of yin-yang interdependence,the article bridges Eastern and Western philosophies to demonstrate the everyday not as a static or trivial backdrop,but as a dynamic and transformative space.It further examines how representations of daily life in the works of Georges Perec and Jacques Roubaud employ the meticulous documentation of mundane details to uncover hidden patterns,rhythms,and structures of human experience.Through literary fieldwork,Perec and Roubaud challenge conventional perceptions of the everyday,unveiling its depth,complexity,and potential for reinvention.
文摘为了解交叉口车路协同领域的研究现状及未来研究热点,以Web of Science和CNKI数据库作为数据源,检索了2000年1月至2024年9月的427篇核心期刊文献。通过文献计量分析,从发文趋势、文献来源和关键词共词分析等角度进行了统计和可视化。统计结果显示,近年来此领域的发文数量呈增长趋势,且样本文献具有较强的代表性。关键词共现分析表明,此领域的研究方向主要包括交叉口管控、路径与速度引导、信号-车辆协同优化、建模与仿真、多车交互安全、单一车辆安全、弱势道路使用者安全、网络通信和路侧感知。对以上研究方向的发展脉络以及具体方法进行了梳理和总结,并基于此展望了交叉口车路协同领域的未来研究热点。
文摘多方隐私集合交集(Multiparty Private Set Intersection,MPSI)协议允许多个参与方各自持有私有集合,在不泄露除交集以外任何信息的前提下,安全计算所有集合的交集,在泄露凭证检查、金融反欺诈和联邦学习等领域具有广泛应用。然而,现有非平衡隐私集合交集协议主要针对两方参与场景,缺乏针对多方参与场景的高效解决方法。为了解决MPSI及其变体协议在非平衡数据集上效率低下的问题,本文提出一种非平衡双中心零共享的方法。该方法结合零共享和不经意键值存储技术,将多方非平衡计算归约为两方非平衡计算,有效降低了通信和计算开销。然后,通过将该方法和两方非平衡隐私集合交集及其变体协议相结合,构建了一种新的高效且可扩展的多方非平衡隐私集合交集(Multiparty Unbalanced Private Set Intersection, MUPSI)及其变体协议。实验结果表明,在相同条件下,客户端的集合规模为2^(10),服务器端的集合规模为2^(27)时,本文提出的MUPSI协议的服务器端在线阶段耗时比目前最优的协议缩短约20%。此外,在32个参与方的场景下,客户端的集合规模为2^(10),服务器端的集合规模为2^(27)时,客户端在线阶段耗时约10秒,验证了该协议在大规模参与方以及集合规模差异显著场景下的有效性。
基金The National Key Technology R&D Program during the 11th Five-Year Plan Period(No.2009BAG13A05)the National Natural Science Foundation of China(No.51078086)
文摘Aiming at prevalent violations of non-motorists at urban intersections in China, this paper intends to clarify the characteristics and risks of non-motorist violations at signalized intersections through questionnaires and video recordings, which may serve as a basis for non-motorized vehicle management. It can help improve the traffic order and enhance the degree of safety at signalized intersections. To obtain the perception information, a questionaire survey on the Internet was conducted and 972 valid questionnaires were returned. It is found that academic degree contributes little to non-motorist violations, while electrical bicyclists have a relatively higher frequency of violations compared with bicyclists. The video data of 18 228 non-motorist behaviors indicate that the violation rate of all non-motorists is 26.5%; the number of conflicts reaches 1 938, among which violation conflicts account for 66.8%. The study shows that the violation rates and the violation behavior at three types of surveyed intersections are markedly different. It is also concluded that the conflict rates and the violation rates are positively correlated. Furthermore, signal violation, traveling in the wrong direction, and overspeeding to cross the intersection are the most dangerous among traffic violation behaviors.
基金The National Natural Science Foundation of China(No50378016)
文摘The pedestrian timing at signalized intersections is studied aiming at the problems of the inconsistency of the vehicular and pedestrian timing requirements and the insufficiency of pedestrian clearance. Based on the formulae of WALK and flashing DON＇T WALK （FDW） in the highway capacity manual （HCM）, the relationship between pedestrian signal indications and vehicular signal indications is discussed using the theory of traffic flow. Then, methods of pedestrian timing for different cases are established, particularly the methods of the pedestrian green adjustment. Ways of pedestrian crossing are analyzed for roadways with different forms and widths of the median island. The sampling values of calculation parameters are studied, and the recommended formulae of pedestrian timing for different conditions are presented.
