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学者姓名：王书易
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To achieve carbon neutrality, many regions have set electrification targets for bus fleets. However, the impact of low temperatures on electric bus (EB) operations is often overlooked, leading to operational difficulties. To this end, we introduce an EB replacement discount coefficient to quantify reduced range and slower charging under low-temperature conditions and develop a Bus Fleet Replacement (BFR) model for cold regions. A case study using typical cold-region data is conducted. Finally, we discuss the effects of individual and combined policies, and parameter variations on the electrification process. The results indicate: i) replacing buses with electric ones in cold regions does not significantly increase the life cycle costs; ii) EB price subsidies and annual operational subsidies effectively accelerate electrification, and most policy combinations further reduce social costs; iii) the model can adjust replacement strategies based on case data and parameter changes. These findings support optimal BFR strategies in cold regions. © 2025 Elsevier Ltd
Keyword ：
Fleet operations Fleet operations Seebeck effect Seebeck effect
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| GB/T 7714 | Zhang, Jie , Pei, Yulong , Sun, Jianqi et al. Achieving bus electrification: Strategy for bus fleet replacement in cold region [J]. | Transportation Research Part D: Transport and Environment , 2025 , 145 . |
| MLA | Zhang, Jie et al. "Achieving bus electrification: Strategy for bus fleet replacement in cold region" . | Transportation Research Part D: Transport and Environment 145 (2025) . |
| APA | Zhang, Jie , Pei, Yulong , Sun, Jianqi , Lai, Yuanwen , Wang, Shuyi , Easa, Said M. . Achieving bus electrification: Strategy for bus fleet replacement in cold region . | Transportation Research Part D: Transport and Environment , 2025 , 145 . |
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It is anticipated that roadside infrastructure sensing units (ISU) can cooperatively work with intelligent and connected vehicles (ICVs) to perceive traffic scenes more accurately when ICVs increasingly penetrate the market. However, the dynamic occlusion issue may still impair the cooperative vehicle-infrastructure perception capability (CVIPC). This study addresses the lack of an effective method for placing ISUs to augment CVIPC in a partially connected traffic environment. This study introduces probabilistic occupancy grids (POGs) to model the uncertainty of dynamic occlusions. The ground truth POG is estimated with a co-simulation method, while the observed POG by ISUs and ICVs are estimated using the proposed occlusion-considered ray-tracing algorithm. The cross entropy (CE) is applied to measure the difference between the ground truth and observed POGs and is used as a surrogate metric for estimating CVIPC. Setting ISUs’ placement parameters and POG-based CE as decision variables and the objective, respectively, Bayesian optimization (BO) is integrated with the multi-agent deep reinforcement learning (DRL) to maximize CVIPC. The test results imply that combining BO and DRL can outperform BO in optimizing ISUs’ placement. Compared to the simulation-in-the-loop optimization, the surrogate metric -based framework can achieve faster optimization with a small compromise on the optimized CVIPC measured by intersection over union. Traffic volume, traffic composition and ICV penetration rate all substantially affect CVIPC. In the test cases, as the ICV penetration rate reaches 50%, the observed POG is very close to the ground truth POG, and a further increase in the number of ICVs does not substantially contribute to improving CVIPC. © 2014 IEEE.
Keyword ：
Cooperative vehicle-infrastructure perception Cooperative vehicle-infrastructure perception placement optimization placement optimization probabilistic occupancy grid probabilistic occupancy grid reinforcement learning reinforcement learning traffic simulation traffic simulation
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| GB/T 7714 | Zheng, Y. , Ma, Y. , Wang, S. et al. A Surrogate Metric-based Framework for Placing Infrastructure Sensing Units to Enhance Cooperative Vehicle-Infrastructure Perception [J]. | IEEE Internet of Things Journal , 2025 . |
| MLA | Zheng, Y. et al. "A Surrogate Metric-based Framework for Placing Infrastructure Sensing Units to Enhance Cooperative Vehicle-Infrastructure Perception" . | IEEE Internet of Things Journal (2025) . |
| APA | Zheng, Y. , Ma, Y. , Wang, S. , Feng, Z. , Wong, Y.D. , Easa, S. . A Surrogate Metric-based Framework for Placing Infrastructure Sensing Units to Enhance Cooperative Vehicle-Infrastructure Perception . | IEEE Internet of Things Journal , 2025 . |
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Under the sudden interruption of the metro, it is significant to dispatch emergency bridging buses to evacuate stranded passengers to improve linkage management and service reliability. Aiming at the problem of emergency bridging bus scheduling, considering the remaining capacity of conventional buses, passenger tolerance, and site convenience, a flexible combined emergency bridging bus scheduling model is constructed based on the constraints of vehicle capacity, dispatching capacity, and maximum evacuation times of emergency bridging bus, aiming at minimizing the maximum evacuation time and passenger delay. The improved Harris hawk algorithm is used to solve the model, and the evacuation plan of the demand-responsive and station-station bridging lines is obtained. The maximum evacuation time is 41 min, and the average delay of stranded passengers is 19 min. The results show that the maximum evacuation time is 10% and 27% less than the fixed combined and single scheduling. The average delay is 16% and 42% less than the fixed combination and traditional single scheduling. The sensitivity analysis of the influencing factors of emergency bridging bus scheduling is conducted. The results show that the flexible combined emergency bridging bus scheduling model constructed in this paper can improve evacuation efficiency and reduce passenger travel delays. image
Keyword ：
emergency services emergency services public transport public transport railway safety railway safety
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| GB/T 7714 | Lai, Yuanwen , Liang, Jianhong , Rao, Yinsheng et al. Flexible optimal bus-schedule bridging for metro operation-interruption [J]. | IET INTELLIGENT TRANSPORT SYSTEMS , 2024 , 18 (7) : 1306-1323 . |
| MLA | Lai, Yuanwen et al. "Flexible optimal bus-schedule bridging for metro operation-interruption" . | IET INTELLIGENT TRANSPORT SYSTEMS 18 . 7 (2024) : 1306-1323 . |
| APA | Lai, Yuanwen , Liang, Jianhong , Rao, Yinsheng , Fan, Yanhui , Zhan, Renyan , Easa, Said et al. Flexible optimal bus-schedule bridging for metro operation-interruption . | IET INTELLIGENT TRANSPORT SYSTEMS , 2024 , 18 (7) , 1306-1323 . |
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To improve the traffic efficiency of bus at a group of intersections and reduce their delay, this paper develops a speed guidance strategy for buses under travel time control at intersection groups. The approach considers the influence of bus departure time, bus station arrival rate, and bus station dwell time. Simulation experiments are carried out on three consecutive intersections along Jinshan Avenue in Fuzhou, China. Results show that the average travel time of buses, the average delay of buses, and the average delay per capita in the priority direction are reduced by 5.5%, 9.9%, and 9.4%, respectively. The optimal rate of the average number of bus stops reached 15.2%. The indicators of the non -priority direction of social vehicles are not significantly affected. It shows that the efficiency of buses has improved after implementing the speed guidance strategy at the intersection groups without affecting the social vehicles as far as possible.
Keyword ：
bus priority bus priority bus speed guidance strategy bus speed guidance strategy intersection group intersection group travel time control travel time control
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| GB/T 7714 | Lai, Yuanwen , Chen, Yansheng , Easa, Said M. et al. Guidelines for bus speed at intersections under travel time control [J]. | CANADIAN JOURNAL OF CIVIL ENGINEERING , 2024 , 51 (9) : 1041-1055 . |
| MLA | Lai, Yuanwen et al. "Guidelines for bus speed at intersections under travel time control" . | CANADIAN JOURNAL OF CIVIL ENGINEERING 51 . 9 (2024) : 1041-1055 . |
| APA | Lai, Yuanwen , Chen, Yansheng , Easa, Said M. , Ma, Zhenhong , Zhu, Xinyun , Chen, Peiyuan et al. Guidelines for bus speed at intersections under travel time control . | CANADIAN JOURNAL OF CIVIL ENGINEERING , 2024 , 51 (9) , 1041-1055 . |
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Roadside sensing units' (RSUs) perception capability may be substantially impaired by occlusion issue even they work cooperatively. However, the joint influence of static and dynamic occlusions in real-life situations remains inadequately considered in optimizing RSUs' placement. This study proposes a virtual-real-fusion simulation (VRFS) framework that combines traffic simulation and point clouds of real-world road environment to optimize RSUs' deployment. Point clouds and triangular meshes are used to model static and dynamic obstacles, respectively. A structure-retained spherical projection method is developed to efficiently emulate RSUs' data collection. Based on the developed VRFS, the probabilistic occupancy maps (POM) are created to represent traffic scenarios. The POM-based cross entropy (CE) is proposed as the surrogate metric for evaluating the detection performance of cooperative RSUs. The Bayesian optimizer is applied to optimize the RSUs' placement parameters (decision variables) by minimizing CE. Test results show that it is viable to use the POM-based CE as a proxy for evaluating cooperative RSUs' sensing performance. Considering the occlusion effect adds to the efficacy of POM-based CE as a surrogate metric. Compared with traffic volume, the adverse effect of the proportion of large vehicles on RSUs' detection performance is more significant. There are no significant patterns regarding how the optimized RSU positions vary with traffic parameters. The comparisons with existing methods further verify the importance of considering both static and dynamic occlusions in optimizing RSUs' placement. Besides, the proposed method can yield better optimization results more efficiently than existing approaches.
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| GB/T 7714 | Ma, Y. , Zheng, Y. B. , Wang, S. Y. et al. Virtual-real-fusion simulation framework for evaluating and optimizing small-spatial-scale placement of cooperative roadside sensing units [J]. | COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING , 2024 , 39 (5) : 707-730 . |
| MLA | Ma, Y. et al. "Virtual-real-fusion simulation framework for evaluating and optimizing small-spatial-scale placement of cooperative roadside sensing units" . | COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING 39 . 5 (2024) : 707-730 . |
| APA | Ma, Y. , Zheng, Y. B. , Wang, S. Y. , Wong, Y. D. , Easa, S. M. . Virtual-real-fusion simulation framework for evaluating and optimizing small-spatial-scale placement of cooperative roadside sensing units . | COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING , 2024 , 39 (5) , 707-730 . |
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This study focuses on solving the problem of metro first/last mile, studying the method for designing microcirculation bus routes and coordinating schedules considering the impact of shared bicycles. First, we propose a bilevel mixed-integer programming model for designing microcirculation bus routes and coordinating schedules considering the impact of shared bicycles. The upper-level model minimizes the weighted sum of the travel time cost of passengers and the operating cost of public transport enterprises, and the lower-level model maximizes the number of passengers served by microcirculation bus routes. Then, an improved genetic algorithm is developed to solve the model, called the Monte Carlo adaptive genetic algorithm (M-GAI). Finally, the proposed model and algorithm are evaluated using the case study in the area near the Fubao metro station of Shenzhen Metro Line 3. Results show that if the impact of shared bicycles is not considered, the passenger demand will be greater than the actual value, and the operating cost of public transport enterprises will be increased by 36%. Compared with GAI, the average number of iterations of M-GAI is reduced by 31%, and the objective function value is decreased by 4%. In addition, when the number of routes increases, the average waiting time of passengers is shortened, the average attendance rate of microcirculation buses increases, and the average empty distance of each vehicle is shortened. However, the operating cost of public transport enterprises will increase with the number of routes. Finally, when weight factors alpha and beta are 0.6 and 0.4, respectively, and the sum of the travel time cost of passengers and the operating cost of public transport enterprises reach optimal.
Keyword ：
Bilevel mixed-integer programming model Bilevel mixed-integer programming model Coordinated schedules Coordinated schedules Microcirculation bus routes design Microcirculation bus routes design Monte Carlo adaptive genetic algorithm (M-GAI) Monte Carlo adaptive genetic algorithm (M-GAI) Public transport Public transport Shared bicycle Shared bicycle
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| GB/T 7714 | Chen, Yansheng , Lai, Yuanwen , Easa, Said M. et al. Microcirculation Bus Routes Design and Coordinated Schedules Considering the Impact of Shared Bicycles [J]. | JOURNAL OF TRANSPORTATION ENGINEERING PART A-SYSTEMS , 2024 , 150 (10) . |
| MLA | Chen, Yansheng et al. "Microcirculation Bus Routes Design and Coordinated Schedules Considering the Impact of Shared Bicycles" . | JOURNAL OF TRANSPORTATION ENGINEERING PART A-SYSTEMS 150 . 10 (2024) . |
| APA | Chen, Yansheng , Lai, Yuanwen , Easa, Said M. , Wang, Shuyi . Microcirculation Bus Routes Design and Coordinated Schedules Considering the Impact of Shared Bicycles . | JOURNAL OF TRANSPORTATION ENGINEERING PART A-SYSTEMS , 2024 , 150 (10) . |
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Automated vehicles equipped with adaptive cruise control systems (ACC-AVs) are prevalent and the ensuing issue is the feasibility of ACC-AVs' operation on the roads. This study investigates the feasibility of road horizontal curve designs for ACC-AVs from a vehicle dynamics perspective. Following the scenario generation framework, we created and tested several scenarios featuring horizontal geometric elements and design speeds, conducting a safety evaluation based on the critical adhesion coefficient, lateral acceleration, lateral-load transfer rate, together with driving comfort indicators. Results indicate that ACC-AV can navigate on road curves designed with a common minimum radius (Rmin_com) effectively at speeds over 60 km/h, comparable to conventional vehicles. However, both Rmin_com and limited minimum radius (Rmin_lim) designs show limitations. Additionally, the feasible radius ranges for ACC-AV reveal the capability to safely handle sharper curves and maintain higher speeds, suggesting potential for adaptable road design in complex environments. Finally, minimum radius ranges were summarized for ACC-AV safe and comfortable operation on road curves, unveiling the potential risks and reminding designers in curve design controls for ACC-AVs.
Keyword ：
Automated vehicles (AVs) Automated vehicles (AVs) Dynamics performance Dynamics performance Road geometry design Road geometry design Road horizontal curves Road horizontal curves Road safety assessment Road safety assessment Virtual simulation Virtual simulation
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| GB/T 7714 | Cai, Mingmao , Zhou, Wen , Wang, Shuyi et al. Road Geometry Feasibility for Automated Vehicles with ACC Systems: Vehicle Dynamics on Curved Roads [J]. | JOURNAL OF TRANSPORTATION ENGINEERING PART A-SYSTEMS , 2024 , 150 (10) . |
| MLA | Cai, Mingmao et al. "Road Geometry Feasibility for Automated Vehicles with ACC Systems: Vehicle Dynamics on Curved Roads" . | JOURNAL OF TRANSPORTATION ENGINEERING PART A-SYSTEMS 150 . 10 (2024) . |
| APA | Cai, Mingmao , Zhou, Wen , Wang, Shuyi , Mao, Chengyang , Liu, Qi , Yu, Bin . Road Geometry Feasibility for Automated Vehicles with ACC Systems: Vehicle Dynamics on Curved Roads . | JOURNAL OF TRANSPORTATION ENGINEERING PART A-SYSTEMS , 2024 , 150 (10) . |
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Due to road curvature and sensors' limited field of view, as-built highway curves would pose an operational challenge to the adaptive cruise control (ACC) system and its shared control. However, very few studies explored the adaptability of ACC system-dedicated vehicles (V-ACC) considering the vehicle-road geometry interaction. Therefore, the objectives of this study are twofold: (i) investigating the implications of horizontal curves on V-ACC dynamics and kinematics characteristics; and (ii) evaluating V-ACC's adaptability from the safety, comfort, and speed consistency (S-C-S) aspects. To this end, a PreScan/CarSim/MATLAB/Simulink co-simulation platform is established and it is validated by OpenACC database followed by designing many tests featuring circular curve radius (RC), desired speed (Vde), and clearance. The impact mechanism of geometric features was analysed by interpreting dynamics and kinematics characteristics along curves and critical features were further extracted by reference to S-C-S thresholds. The results show that: (i) either smaller RC or higher Vde causes those characteristics toward their S-C-S margins; (ii) neither sideslip nor rollover occurs, and speed consistency is good in most RC conditions; and (iii) drivers can follow the leading car comfortably with Vde = 40, 80-100 km/h but feel uncomfortable when Vde = 50-70 km/h and RC approaches its lower bounds.
Keyword ：
automated driving & intelligent vehicles automated driving & intelligent vehicles geometry geometry road safety road safety simulation simulation
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| GB/T 7714 | Wang, Shuyi , Lai, Yuanwen , Qiu, Xuntao et al. Implications of as-built highway horizontal curves on vehicle dynamics/kinematics characteristics under adaptive cruise control [J]. | IET INTELLIGENT TRANSPORT SYSTEMS , 2024 , 19 (1) . |
| MLA | Wang, Shuyi et al. "Implications of as-built highway horizontal curves on vehicle dynamics/kinematics characteristics under adaptive cruise control" . | IET INTELLIGENT TRANSPORT SYSTEMS 19 . 1 (2024) . |
| APA | Wang, Shuyi , Lai, Yuanwen , Qiu, Xuntao , Ma, Yang , Easa, Said M. , Zheng, Yubing . Implications of as-built highway horizontal curves on vehicle dynamics/kinematics characteristics under adaptive cruise control . | IET INTELLIGENT TRANSPORT SYSTEMS , 2024 , 19 (1) . |
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Roadside monitoring Lidars (RMLs) will be a crucial part of the future intelligent transportation system. Current approaches for optimizing RMLs' placement at intersections work in hypothetical environments which do not well reflect real-world situations. This article proposes a new virtual method (VM) for optimizing the deployment of RMLs at as-built intersections. The proposed VM operates in a virtual environment where both static background and dynamic agents are modeled by dense point clouds. The agents are driven by real-world motion data. Using RMLs' parameters as inputs, a coarse-to-fine subsampling approach is developed to generate laser scans in the virtual world. An objective function is then defined by comparing the agents' points in the generated laser scan sequences against their original models. Bayesian optimization is applied to maximize the objective function by setting the RMLs' positions and poses as decision variables. Besides, batch processing strategy and parallel computing are used to accelerate the optimization process. The effectiveness of the proposed VM is demonstrated in a case study. The VM shall help road administrators make decisions on RMLs' deployment at as-built intersections.
Keyword ：
Bayesian optimization Bayesian optimization Digital twins Digital twins Lidar Lidar point cloud point cloud smart infrastructures smart infrastructures virtual method virtual method
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| GB/T 7714 | Ma, Yang , Zheng, Yubing , Wang, Shuyi et al. A Virtual Method for Optimizing Deployment of Roadside Monitoring Lidars at As-Built Intersections [J]. | IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS , 2023 , 24 (11) : 11835-11849 . |
| MLA | Ma, Yang et al. "A Virtual Method for Optimizing Deployment of Roadside Monitoring Lidars at As-Built Intersections" . | IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS 24 . 11 (2023) : 11835-11849 . |
| APA | Ma, Yang , Zheng, Yubing , Wang, Shuyi , Wong, Yiik Diew , Easa, Said M. . A Virtual Method for Optimizing Deployment of Roadside Monitoring Lidars at As-Built Intersections . | IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS , 2023 , 24 (11) , 11835-11849 . |
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Icy pavement is one of the primary causes affecting driving safety in winter, and deicing asphalt mixture could effectively resist pavement icing. This study evaluated the effect of a slow-release deicing agent on pavement performance and ice-melting characteristics of the asphalt mixture. The asphalt mixture containing four different contents (0%, 30%, 50%, and 70% using the internal mixing method) by replacing mineral filler was designed. Pavement performance tests were used to investigate the effect of the deicing agent on the high-temperature stability, cracking resistance, and water stability of the asphalt mixture. Qualitative and quantitative tests were designed to compare the ice-melting characteristics and predict the ice-melting durability with different replacement amounts. The experimental results show that the high-temperature stability, low-temperature cracking resistance, and water stability of the asphalt mixture decrease with the increase inthe deicing agent. The mineral filler with a content of 50% deicing agent will enhance the stability of the mixture in the short term. Deicing asphalt mixture can significantly improve the ice and snow melting ability of the pavement, and the asphalt mixture with a content of 50% deicing agent will reduce the interface adhesion between mixture and ice by more than 55%. The slow-release deicing asphalt mixture can reach the maximum release concentration within two hours under rain and snow. The recommended replacement amount of slow-release deicing agent is 50%, and the predicted durability of deicing asphalt mixture is 5-8 years.
Keyword ：
deicing mixture deicing mixture durability prediction durability prediction ice-melting characteristics ice-melting characteristics pavement performance pavement performance road engineering road engineering
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| GB/T 7714 | Zhang, Jiaqiang , Wang, Weicheng , Liu, Jinzhou et al. Pavement Performance and Ice-Melting Characteristics of Asphalt Mixtures Incorporating Slow-Release Deicing Agent [J]. | BUILDINGS , 2023 , 13 (2) . |
| MLA | Zhang, Jiaqiang et al. "Pavement Performance and Ice-Melting Characteristics of Asphalt Mixtures Incorporating Slow-Release Deicing Agent" . | BUILDINGS 13 . 2 (2023) . |
| APA | Zhang, Jiaqiang , Wang, Weicheng , Liu, Jinzhou , Wang, Shuyi , Qin, Xiaochun , Yu, Bin . Pavement Performance and Ice-Melting Characteristics of Asphalt Mixtures Incorporating Slow-Release Deicing Agent . | BUILDINGS , 2023 , 13 (2) . |
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