城市交通拥堵日益严重,高效的路径导航方法一直是当前研究的热点和缓解拥堵的主要途径.现有的研究成果主要集中在对单个车辆行驶时间的路径寻优和小规模路网的多车辆均衡化的路径导航,没有实现大规模多车辆多路径的实时动态路径导航.当...城市交通拥堵日益严重,高效的路径导航方法一直是当前研究的热点和缓解拥堵的主要途径.现有的研究成果主要集中在对单个车辆行驶时间的路径寻优和小规模路网的多车辆均衡化的路径导航,没有实现大规模多车辆多路径的实时动态路径导航.当前研究主要存在以下局限:(1)导航方案评价指标单一,不能充分表示导航方案的优劣;(2)无法实现大规模路网的实时导航.针对这些问题,本文提出一种城市交通路网实时动态多路口路径导航量子搜索方法(A Route Guidance Method based on Quantum Searching for Real-time Dynamic Multi-intersections in Urban Traffic Networks,RGQS),该方法充分考虑各种因素,实时提供大规模路网的路径导航.本文的实验分别在人工路网和真实路网中验证了RGQS方法相比于对比算法可以使行驶时间减少达到20%.展开更多
In the process of ion-adsorption rare earth ore leaching,the migration characteristics of the wetting front in multi-hole injection holes and the influence of wetting front intersection effect on the migration distanc...In the process of ion-adsorption rare earth ore leaching,the migration characteristics of the wetting front in multi-hole injection holes and the influence of wetting front intersection effect on the migration distance of wetting fronts are still unclear.Besides,wetting front migration distance and leaching time are usually required to optimize the leaching process.In this study,wetting front migration tests of ionadsorption rare earth ores during the multi-hole fluid injection(the spacing between injection holes was 10 cm,12 cm and 14 cm)and single-hole fluid injection were completed under the constant water head height.At the pre-intersection stage,the wetting front migration laws of ion-adsorption rare earth ores during the multi-hole fluid injection and single-hole fluid injection were identical.At the postintersection stage,the intersection accelerated the wetting front migration.By using the Darcy’s law,the intersection effect of wetting fronts during the multi-hole liquid injection was transformed into the water head height directly above the intersection.Finally,based on the Green-Ampt model,a wetting front migration model of ion-adsorption rare earth ores during the multi-hole unsaturated liquid injection was established.Error analysis results showed that the proposed model can accurately simulate the infiltration process under experimental conditions.The research results enrich the infiltration law and theory of ion-adsorption rare earth ores during the multi-hole liquid injection,and this study provides a scientific basis for optimizing the liquid injection well pattern parameters of ion-adsorption rare earth in situ leaching in the future.展开更多
With the emerging connected autonomous driving paradigm,more advanced applications leveraging vehicular communications are drawing tremendous attentions.In order to analyze the feasibility and performance of these app...With the emerging connected autonomous driving paradigm,more advanced applications leveraging vehicular communications are drawing tremendous attentions.In order to analyze the feasibility and performance of these applications,it is necessary to build an evaluation platform that jointly considers vehicular communication,road traffic and vehicle dynamics.This article describes our recent progress on network-level autonomous driving simulator based on the Cellular-Vehicle-to-Everything(C-V2X)protocol,and a joint platform combined with SUMO and CARLA simulators for evaluating road traffic and vehicle dynamics.To demonstrate its effectiveness,this article implements a hybrid multi-intersection scheduling scheme on the platform,and shows the advantages of the scheme in terms of traffic efficiency and fault tolerance.A remote driving application based on CARLA,wherein the interplay between communication and computation is also investigated.展开更多
文摘城市交通拥堵日益严重,高效的路径导航方法一直是当前研究的热点和缓解拥堵的主要途径.现有的研究成果主要集中在对单个车辆行驶时间的路径寻优和小规模路网的多车辆均衡化的路径导航,没有实现大规模多车辆多路径的实时动态路径导航.当前研究主要存在以下局限:(1)导航方案评价指标单一,不能充分表示导航方案的优劣;(2)无法实现大规模路网的实时导航.针对这些问题,本文提出一种城市交通路网实时动态多路口路径导航量子搜索方法(A Route Guidance Method based on Quantum Searching for Real-time Dynamic Multi-intersections in Urban Traffic Networks,RGQS),该方法充分考虑各种因素,实时提供大规模路网的路径导航.本文的实验分别在人工路网和真实路网中验证了RGQS方法相比于对比算法可以使行驶时间减少达到20%.
基金This research was funded by the National Natural Science Foundation of China(Grant No.52174113)the Young Jinggang Scholars Award Program in Jiangxi Province,China(Grant No.QNJG2018051)the“Thousand Talents”of Jiangxi Province,China(Grant No.jxsq2019201043).
文摘In the process of ion-adsorption rare earth ore leaching,the migration characteristics of the wetting front in multi-hole injection holes and the influence of wetting front intersection effect on the migration distance of wetting fronts are still unclear.Besides,wetting front migration distance and leaching time are usually required to optimize the leaching process.In this study,wetting front migration tests of ionadsorption rare earth ores during the multi-hole fluid injection(the spacing between injection holes was 10 cm,12 cm and 14 cm)and single-hole fluid injection were completed under the constant water head height.At the pre-intersection stage,the wetting front migration laws of ion-adsorption rare earth ores during the multi-hole fluid injection and single-hole fluid injection were identical.At the postintersection stage,the intersection accelerated the wetting front migration.By using the Darcy’s law,the intersection effect of wetting fronts during the multi-hole liquid injection was transformed into the water head height directly above the intersection.Finally,based on the Green-Ampt model,a wetting front migration model of ion-adsorption rare earth ores during the multi-hole unsaturated liquid injection was established.Error analysis results showed that the proposed model can accurately simulate the infiltration process under experimental conditions.The research results enrich the infiltration law and theory of ion-adsorption rare earth ores during the multi-hole liquid injection,and this study provides a scientific basis for optimizing the liquid injection well pattern parameters of ion-adsorption rare earth in situ leaching in the future.
基金This work was supported by the National Key R&D Program of China(Grant No.2019YFE0196600)the Nature Science Foundation of China(No.61871254,No.91638204,No.61861136003)the program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning,and research funds from the Shanghai Institute for Advanced Communication and Data Science(SICS).
文摘With the emerging connected autonomous driving paradigm,more advanced applications leveraging vehicular communications are drawing tremendous attentions.In order to analyze the feasibility and performance of these applications,it is necessary to build an evaluation platform that jointly considers vehicular communication,road traffic and vehicle dynamics.This article describes our recent progress on network-level autonomous driving simulator based on the Cellular-Vehicle-to-Everything(C-V2X)protocol,and a joint platform combined with SUMO and CARLA simulators for evaluating road traffic and vehicle dynamics.To demonstrate its effectiveness,this article implements a hybrid multi-intersection scheduling scheme on the platform,and shows the advantages of the scheme in terms of traffic efficiency and fault tolerance.A remote driving application based on CARLA,wherein the interplay between communication and computation is also investigated.
基金国家自然科学基金(the National Natural Science Foundation of China under Grant No.60664001)江西省自然科学基金(the Natural Science Foundation of Jiangxi Province of China under Grant No.0511030)
