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学者姓名：王书易
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Abstract ：
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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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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为更好地分析地铁线网性能，优化其在扰动状态下的恢复策略，采用基于复杂网络的地铁线网性能分析方法，并提出最小化韧性损失恢复策略.鉴于地铁线网复杂网络特征，采用Space L拓扑方法处理地铁线网，并运用复杂网络理论计算线网内各站点的基本参数，包括线网的度、平均路径和线网效率等.其次根据韧性理论以线网效率作为性能指标求解各站点韧性损失，采用遗传算法求解站点恢复序列.最后，以福州市为例，分析其地铁线网的复杂网络特征并进行扰动仿真，比较在多站点失效情况下的最小化韧性损失恢复策略与随机恢复策略的恢复效果.研究结果表明：在多个地铁站点受到扰动失效，采用最小化韧性损失恢复策略能够令地铁线网性能在恢复期间仍处于较优水平，恢复效果明显优于具有不确定性的随机恢复策略.
Keyword ：
仿真分析 仿真分析 地铁线网 地铁线网 城市交通 城市交通 复杂网络 复杂网络 扰动 扰动 韧性损失 韧性损失
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| GB/T 7714 | 赖元文 , 郭凌 , 王书易 . 地铁线网性能分析及最小化韧性损失恢复策略 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (04) : 479-486 . |
| MLA | 赖元文 et al. "地铁线网性能分析及最小化韧性损失恢复策略" . | 福州大学学报(自然科学版) 52 . 04 (2024) : 479-486 . |
| APA | 赖元文 , 郭凌 , 王书易 . 地铁线网性能分析及最小化韧性损失恢复策略 . | 福州大学学报(自然科学版) , 2024 , 52 (04) , 479-486 . |
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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. © 2024 American Society of Civil Engineers.
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, M. , Zhou, W. , Wang, S. 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, M. 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, M. , Zhou, W. , Wang, S. , Mao, C. , Liu, Q. , Yu, B. . 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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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 α and β 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. © 2024 American Society of Civil Engineers.
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, Y. , Lai, Y. , Easa, S.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, Y. 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, Y. , Lai, Y. , Easa, S.M. , Wang, S. . 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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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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Most existing road infrastructures were constructed before the emergence of automated vehicles (AVs) without considering their operational needs. Whether and how AVs could safely adapt to as-built highway geometry are questions that remain inconclusive, and a plausible concern is a challenge from vertical alignments. To fill this gap, this study uses a virtual simulation to investigate the available sight distance (ASD) of AVs on vertical alignments subject to the current highway geometric design specification and its implications for speed limits. According to the scenario generation framework, several scenarios featuring vertical geometric elements and lidar sensors were created and tested. Moreover, the maximum speed for adequate ASD is calculated to determine the AV speed limit, considering safe sight distance and speed consistency requirements. The results indicate that crest curves are not disadvantaged in ASD compared with either sag curves or tangent grades. Only equipped with multichannel lidar and advanced perception algorithms enabling a lower detection threshold would a level 4 AV be compatible with the as-built vertical alignment with a design speed (V-d) of 100 km/h. However, a level 3 AV can only adapt to the vertical profile with V-d = 60 km/h. The findings of this study should be of interest to the road-oriented operational design domain and support road administrators in regulating AV safe speeds.
Keyword ：
Automation Automation Geometry Geometry Laser radar Laser radar Roads Roads Sensors Sensors TV TV Variable speed drives Variable speed drives
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| GB/T 7714 | Wang, Shuyi , Ma, Yang , Easa, Said M. et al. Sight Distance of Automated Vehicles Considering Highway Vertical Alignments and Its Implications for Speed Limits [J]. | IEEE INTELLIGENT TRANSPORTATION SYSTEMS MAGAZINE , 2023 , 16 (4) : 45-61 . |
| MLA | Wang, Shuyi et al. "Sight Distance of Automated Vehicles Considering Highway Vertical Alignments and Its Implications for Speed Limits" . | IEEE INTELLIGENT TRANSPORTATION SYSTEMS MAGAZINE 16 . 4 (2023) : 45-61 . |
| APA | Wang, Shuyi , Ma, Yang , Easa, Said M. , Zhou, Hao , Lai, Yuanwen , Chen, Weijie . Sight Distance of Automated Vehicles Considering Highway Vertical Alignments and Its Implications for Speed Limits . | IEEE INTELLIGENT TRANSPORTATION SYSTEMS MAGAZINE , 2023 , 16 (4) , 45-61 . |
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Emerging automated vehicle (AV) technology is being deployed on as-built roadways due to its promising safety improvements. However, realistic problems concerning whether and how perception sensor-based AVs can safely adapt to the existing roadway infrastructures remain to be well addressed due to a lack of consideration of the sensor's angular resolution and detection threshold. In this study, we aim to assess whether LiDAR-based AVs (LAVs) could safely adapt to as-built horizontal curved roads from the perspective of available sight distances (ASDs) through virtual simulations. In specific, i) numerous driving scenarios featuring the design speed (V-d: 40 similar to 100 km/h), circular curve radius (R: limited minimum radius similar to common minimum radius), LAV (with LiDAR technical parameters, e.g., number of channels, N-c: 32, 64, 128), and the front target vehicle were simulated in PreScan/MATLAB/Simulink co-simulation platform; ii) an ASD extraction algorithm was proposed considering the point threshold for detection (N-T); iii) effects of V-d, R, N-c, and N-T on the ASD were analyzed and polynomial models were adopted to capture relationships between the ASD, V-d, R at different N-c and N-T; iv) the minimum speed against as-built sight obstructions along the roadside and the maximum speed against inadequate sight distance were proposed by comparing the ASD with the required stopping sight distance of human-driven vehicles and LAVs (level 3 similar to 5), respectively; and v) speed limits (V-L) against inadequate sight distances for level 3 similar to 5 LAVs were proposed. The results indicate that: i) a larger R or V-d, fewer N-c, or a higher N-T would cause a shorter ASD in general; ii) attention should be paid to the occlusion imposed by as-built roadside infrastructures even with more N-c or/and a lower N-T, particularly to curved roads with more rigorous geometric design controls (e.g., small V-d); and iii) level 3 LAVs struggle to adapt to as-built horizontal curved roads, and level 4 or 5 LAVs cannot assure adequate ASDs on high-type curved roads (e.g., large V-d). These findings shall help road administrators make decisions on speed limits for LAVs on as-built curved roads.
Keyword ：
Automated vehicle Automated vehicle Available sight distance Available sight distance LiDAR LiDAR Road geometry Road geometry Road safety Road safety Virtual simulation Virtual simulation
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| GB/T 7714 | Wang, Shuyi , Ma, Yang , Liu, Jinzhou et al. Readiness of as-built horizontal curved roads for LiDAR-based automated vehicles: A virtual simulation analysis [J]. | ACCIDENT ANALYSIS AND PREVENTION , 2022 , 174 . |
| MLA | Wang, Shuyi et al. "Readiness of as-built horizontal curved roads for LiDAR-based automated vehicles: A virtual simulation analysis" . | ACCIDENT ANALYSIS AND PREVENTION 174 (2022) . |
| APA | Wang, Shuyi , Ma, Yang , Liu, Jinzhou , Yu, Bin , Zhu, Feng . Readiness of as-built horizontal curved roads for LiDAR-based automated vehicles: A virtual simulation analysis . | ACCIDENT ANALYSIS AND PREVENTION , 2022 , 174 . |
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