本团队关于交通设计与控制领域的研究具体包括道路网络交通控制、非常规交叉口控制、公交信号优先控制、行人过街交通控制、数据驱动与诊断优化等方面。从传统的数据环境逐步发展到全息感知环境以及车路联网环境,优化交通设计与控制方案,实现个体适应最佳、配时参数最优、相位设计合理、网络主动预防、以及设施利用最佳等。下面分别对五个子领域包含的研究内容进行了介绍。
1. 道路网络信号控制主要包括城市道路跟车模型的建立,城市道路交叉口信号配时、左转待行区、行人过街优化,城市干线道路协调绿波设计。
2. 非常规交叉口控制主要包括环形交叉口的渠化方案和信号配时优化,以及不允许左转交叉口的优化。
3. 公交信号优化控制主要包括城市道路交叉口多公交申请的信号优先,交叉口公交驻站控制-速度引导-信号优化协同控制,城市干线道路协调信号优先。
4. 行人过街信号控制主要包括考虑效率、安全等因素的行人专用相位优化设计,在感应控制情况下的行人专用相位优化设计。
5. 数据驱动与诊断优化主要包括对轨迹数据的处理和多源数据的融合,信号控制水平指数的计算。
下图展示了各个子领域的代表性研究。
1. Hao R., Zhang Y., Ma W., Yu C., Sun T., van Arem B. , Managing connected and automated vehicles with flexible routing at “lane-allocation-free” intersections , 2023 , Transportation Research Part C: Emerging Technologies
2. Zhang N., Yang X., Guo H., Dong H., Ma W. , Approximate Inference of Traffic Flow State at Signalized Intersections Using a Bayesian Learning Framework , 2023 , IEEE Transactions on Intelligent Transportation Systems
3. Danesh A., Ma W., Wang L. , Identifying the Adaptability of Different Control Types Based on Delay and Capacity for Isolated Intersection , 2023 , Transportation Research Record
4. Huang L., Ma W., Wang L., An K. , Using Reinforcement Learning to Handle the Unintended Lateral Attack in the Intelligent Connected Vehicle Environment , 2023 , Journal of Advanced Transportation
5. Hao R., Liu M., Ma W., van Arem B., Wang M. , A flock-like two-dimensional cooperative vehicle formation model based on potential functions , 2023 , Transportmetrica B
6. Cao J., Chen J., Guo X., Wang L. , Trajectory data-based severe conflict prediction for expressways under different traffic states , 2023 , Physica A: Statistical Mechanics and its Applications
7. Danesh A., Ma W., Wang L. , Identifying the Adaptability of Different Control Types Based on Delay and Capacity for Isolated Intersection , 2023 , Transportation Research Record
8. Ma C., Yu C., Zhang C., Yang X. , Signal timing at an isolated intersection under mixed traffic environment with self-organizing connected and automated vehicles , 2023 , Computer-Aided Civil and Infrastructure Engineering
9. Hao R., Zhang Y., Ma W., Yu C., Sun T., van Arem B. , Managing connected and automated vehicles with flexible routing at “lane-allocation-free” intersections , 2023 , Transportation Research Part C: Emerging Technologies
10. Ma W.-J., Li J.-J., Yu C.-H. , Intersection Control in Mixed Traffic with Connected Automated Vehicles: A Review of Recent Developments and Research Frontiers [智能网联混合交通流交叉口控制:研究进展与前沿] , 2023 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
11. Su Z.C., Chow A.H.F., Fang C.L., Liang E.M., Zhong R.X. , Hierarchical control for stochastic network traffic with reinforcement learning , 2023 , Transportation Research Part B: Methodological
12. Ma W., Chen B., Yu C., Qi X. , Trajectory Planning for Connected and Autonomous Vehicles at Freeway Work Zones under Mixed Traffic Environment , 2022 , Transportation Research Record
13. Wu M., Yu C., Ma W., An K., Zhong Z. , Joint optimization of timetabling, vehicle scheduling, and ride-matching in a flexible multi-type shuttle bus system , 2022 , Transportation Research Part C: Emerging Technologies
14. Ou S., Yu C., Ma W. , Connected Bus Real-Time Priority Control Considering Arterial Signal Coordination [干线信号协调背景下的网联公交实时优先控制方法] , 2022 , Tongji Daxue Xuebao/Journal of Tongji University
15. Wang L., Wang Y., Qi X., Ma W. , Travel Time Reliability Factor Analysis of Regular Bus Route Based on GPS [基于GPS的常规公交行程时间可靠性因素分析] , 2022 , Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering)
16. Wang L., Wang K., Ma W., Abdel-Aty M., Li L. , Real-time safety analysis for expressways considering the heterogeneity of different segment types , 2022 , Journal of Safety Research
17. Ma W., Li J., Yu C. , Shared-phase-dedicated-lane based intersection control with mixed traffic of human-driven vehicles and connected and automated vehicles , 2022 , Transportation Research Part C: Emerging Technologies
18. Zheng Z., An K., Ma W. , Evaluation and Optimization of Lane Allocation at Isolated Intersections Using Trajectory Data , 2022 , IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC
19. Er J., Yu C., Ma W. , Offset Optimization for Arterial Signal Coordination Considering Spillover Prevention , 2022 , IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC
20. Pang T., Yu C., Ma W., Wang L., Lin Q. , Intermittent and Dynamic Priority Control of Dedicated Lanes for Connected and Automated Vehicles on Freeways , 2022 , IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC
21. He Z., Wang L., Wang K., Ma W., Yu C. , Ramp Metering Strategy for Expressway Based on Congestion Risk Prediction , 2022 , CICTP 2022: Intelligent, Green, and Connected Transportation - Proceedings of the 22nd COTA International Conference of Transportation Professionals
22. Wang K., Wang L., Ma W. , Real-Time Traffic State Prediction and Congestion Mechanism Analysis for Expressways , 2022 , CICTP 2022: Intelligent, Green, and Connected Transportation - Proceedings of the 22nd COTA International Conference of Transportation Professionals
23. Ou S., Ma W., Hao R., Sun T. , A Vehicle-Pedestrian Two-Way Collision Alert System under Coordinated Vehicle Infrastructure Environment , 2022 , CICTP 2022: Intelligent, Green, and Connected Transportation - Proceedings of the 22nd COTA International Conference of Transportation Professionals
24. Ou S., Ma W., Yu C. , Optimization of Bus Scheduling and Bus-Berth Matching at Curbside Stops under Connected Vehicle Environment , 2022 , Journal of Advanced Transportation
25. Zhou Y., Sun T., Wen S., Zhong H., Cui Y., Xie J., Wu W., Ma W. , Effectiveness Analysis on Human-Machine Information Interaction of Intelligent Highway , 2022 , Journal of Advanced Transportation
26. Wu M., An K., Zeng L., Li S. , Spatiotemporal Bi-objective Evaluation Method for Urban Bus Systems [时空维度下城市地面公交系统双目标评价方法] , 2022 , Tongji Daxue Xuebao/Journal of Tongji University
27. Liang E., Su Z., Fang C., Zhong R. , OAM: An Option-Action Reinforcement Learning Framework for Universal Multi-Intersection Control , 2022 , Proceedings of the 36th AAAI Conference on Artificial Intelligence, AAAI 2022
28. Ma W., He Z., Wang L., Abdel-Aty M., Yu C. , Active traffic management strategies for expressways based on crash risk prediction of moving vehicle groups , 2021 , Accident Analysis and Prevention
29. Danesh A., Ma W., Yu C., Hao R., Ma X. , Optimal roundabout control under fully connected and automated vehicle environment , 2021 , IET Intelligent Transport Systems
30. Zhao J., Ma W. , An Alternative Design for the Intersections with Limited Traffic Lanes and Queuing Space , 2021 , IEEE Transactions on Intelligent Transportation Systems
31. Alimo P.K., Ma W., Wang L. , A Safety Audit of Seven Signalized Intersections in Ghana Based on Crash Data, Video Observations, and Surveys , 2021 , 6th International Conference on Transportation Information and Safety: New Infrastructure Construction for Better Transportation, ICTIS 2021
32. Wang L., Wu Z., Li W., Liu H., Ma W. , Adaptability Assessment Framework for Public Transit Systems with Automated Vehicles on Open Flow Roads , 2021 , CICTP 2021: Advanced Transportation, Enhanced Connection - Proceedings of the 21st COTA International Conference of Transportation Professionals
33. Wu M., Yu C., Ma W., Wang L., Ma X. , Reinforcement Learning Based Demand-Responsive Public Transit Dispatching , 2021 , CICTP 2021: Advanced Transportation, Enhanced Connection - Proceedings of the 21st COTA International Conference of Transportation Professionals
34. Yuan J., Li L., Ma W. , Robustness Analysis of Budget-Constrained Route Flow Observability Problem , 2021 , CICTP 2021: Advanced Transportation, Enhanced Connection - Proceedings of the 21st COTA International Conference of Transportation Professionals
35. Shi W., Hao R., Yu C., Ma W. , Change of Traffic with Autonomous Vehicle and Connected Vehicle , 2021 , CICTP 2021: Advanced Transportation, Enhanced Connection - Proceedings of the 21st COTA International Conference of Transportation Professionals
36. Wang L., Ma W., Wang L., Ren Y., Yu C. , Enabling In-Depot Automated Routing and Recharging Scheduling for Automated Electric Bus Transit Systems , 2021 , Journal of Advanced Transportation
37. Hao R., Wang L., Ma W., Yu C. , Estimating signal timing of actuated signal control using pattern recognition under connected vehicle environment , 2021 , Promet - Traffic - Traffico
38. Wang L., Zeng L., Ma W., Guo Y. , Integrating Passenger Incentives to Optimize Routing for Demand-Responsive Customized Bus Systems , 2021 , IEEE Access
39. Ma C., Yu C., Yang X. , Trajectory planning for connected and automated vehicles at isolated signalized intersections under mixed traffic environment , 2021 , Transportation Research Part C: Emerging Technologies
40. Feng S., Feng Y., Yu C., Zhang Y., Liu H.X. , Testing Scenario Library Generation for Connected and Automated Vehicles, Part I: Methodology , 2021 , IEEE Transactions on Intelligent Transportation Systems
41. He N., Liu L., Ma C., Gao L., Tang G., Yu C. , Visual Exploration of Urban Road Network Traffic Based on Reconstructed Trajectory Data , 2021 , CICTP 2021: Advanced Transportation, Enhanced Connection - Proceedings of the 21st COTA International Conference of Transportation Professionals
42. Huang Y.P., Chen C., Su Z.C., Chen T.S., Sumalee A., Pan T.L., Zhong R.X. , Bus arrival time prediction and reliability analysis: An experimental comparison of functional data analysis and Bayesian support vector regression , 2021 , Applied Soft Computing
43. Chow A.H.F., Su Z.C., Liang E.M., Zhong R.X. , Adaptive signal control for bus service reliability with connected vehicle technology via reinforcement learning , 2021 , Transportation Research Part C: Emerging Technologies
44. Su Z.C., Chow A.H.F., Zhong R.X. , Adaptive network traffic control with an integrated model-based and data-driven approach and a decentralised solution method , 2021 , Transportation Research Part C: Emerging Technologies
45. Wang L., Zhong H., Huang W., Ma W. , Pedestrian Spatial Violation Analyses for Urban Roadways , 2020 , Journal of Transportation Engineering Part A: Systems
46. Yu C., Ma W., Yang X. , A time-slot based signal scheme model for fixed-time control at isolated intersections , 2020 , Transportation Research Part B: Methodological
47. Wu W., Liu Y., Liu W., Wu G.-H., Ma W.-J. , A Novel Autonomous Vehicle Trajectory Planning and Control Model for Connected-and-Autonomous Intersections [自动驾驶环境下交叉口车辆路径规划与最优控制模型] , 2020 , Zidonghua Xuebao/Acta Automatica Sinica
48. Qi X., Sun T., Ma W., Wang L., Yu C. , Evaluation of a variable speed limit system using a hierarchical framework under a connected vehicles environment: A case study of a field test in Seattle , 2020 , IET Intelligent Transport Systems
49. Nie L., Ma W.-J. , Novel model for generation and optimization of signal phase and phase sequence at isolated intersection [信号控制交叉口相位相序自动生成和优化模型] , 2020 , Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition)
50. Shi W., Ma W., Liu X. , Traffic Control on Queue Spillbacks at Bus Stops [公交站点排队溢出控制方法] , 2020 , Tongji Daxue Xuebao/Journal of Tongji University
51. Nte L., Ma W. , A Lane-Based Optimization Model for Lane Function and Signal Phase at Intersection [基于车道的交叉口车道功能和信号相位优化模型] , 2020 , Tongji Daxue Xuebao/Journal of Tongji University
52. Wang L., Zhong H., Ma W., Abdel-Aty M., Park J. , How many crashes can connected vehicle and automated vehicle technologies prevent: A meta-analysis , 2020 , Accident Analysis and Prevention
53. Shi W., Yu C., Ma W., Wang L., Nie L. , Simultaneous Optimization of Passive Transit Priority Signals and Lane Allocation , 2020 , KSCE Journal of Civil Engineering
54. Wang L., Zhong H., Ma W., Zhong Y., Wang L. , Multi-source data-driven prediction for the dynamic pickup demand of one-way carsharing systems , 2020 , Transportmetrica B
55. Chen B., Fu T., Wang L., Yu C., Ma W. , Efficiency Evaluation of Signal Control Intersections Based on Trajectory Data , 2020 , CICTP 2020: Transportation Evolution Impacting Future Mobility - Selected Papers from the 20th COTA International Conference of Transportation Professionals
56. Zhu H., Zhu X., Qi X., Ma W., Wang L., Yu C. , Integrated Control Method for Freeway Work Zones under Partially Connected Vehicle Environment , 2020 , CICTP 2020: Transportation Evolution Impacting Future Mobility - Selected Papers from the 20th COTA International Conference of Transportation Professionals
57. Sun T., Yang C., Han K., Ma W., Zhang F. , Bidirectional Spatial–Temporal Network for Traffic Prediction with Multisource Data , 2020 , Transportation Research Record
58. Nie L., Ma W. , A Novel Model for Optimization of Lane Allocation at Isolated Intersection [基于车道等饱和度的交叉口车道功能优化模型] , 2020 , Tongji Daxue Xuebao/Journal of Tongji University
59. Wu Z., An K., Wang W., Currie G., Hu X. , Comprehensive Approach to Transfer Synchronization in Public Transit , 2020 , Journal of Transportation Engineering Part A: Systems
60. Liang X., Correia G.H.D.A., An K., van Arem B. , Automated taxis’ dial-a-ride problem with ride-sharing considering congestion-based dynamic travel times , 2020 , Transportation Research Part C: Emerging Technologies
61. Wu Z., Zeng X., Wang L. , A new traffic conflict measurefor electric bicycles at intersections , 2020 , Promet - Traffic - Traffico
62. Ma C., Yu C., Lai J., Yang X. , Signal Timing Optimization for Isolated Intersections under Mixed Traffic Environment , 2020 , 2020 IEEE 23rd International Conference on Intelligent Transportation Systems, ITSC 2020
63. Su Z.C., Chow A.H.F., Zheng N., Huang Y.P., Liang E.M., Zhong R.X. , Neuro-dynamic programming for optimal control of macroscopic fundamental diagram systems , 2020 , Transportation Research Part C: Emerging Technologies
64. Wang L., Ma W., Fan Y., Zuo Z. , Trip chain extraction using smartphone-collected trajectory data , 2019 , Transportmetrica B
65. Wu W., Liu Y., Ma W.-J. , Intersection Traffic Control Model for Free-turning Lane in Connected and Autonomous Vehicle Environment [自动驾驶环境下面向交叉口自由转向车道的交通控制模型] , 2019 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
66. Li M., Wu X., Zhang Z., Yu G., Wang Y., Ma W. , A Wireless Charging Facilities Deployment Problem Considering Optimal Traffic Delay and Energy Consumption on Signalized Arterial , 2019 , IEEE Transactions on Intelligent Transportation Systems
67. Wang S., Li L., Ma W., Chen X. , Trajectory analysis for on-demand services: A survey focusing on spatial-temporal demand and supply patterns , 2019 , Transportation Research Part C: Emerging Technologies
68. Yu C., Feng Y., Liu H.X., Ma W., Yang X. , Corridor level cooperative trajectory optimization with connected and automated vehicles , 2019 , Transportation Research Part C: Emerging Technologies
69. Yuan J., Yu C., Wang L., Ma W. , Driver Back-Tracing Based on Automated Vehicle Identification Data , 2019 , Transportation Research Record
70. Wang L., Abdel-Aty M., Ma W., Hu J., Zhong H. , Quasi-vehicle-trajectory-based real-time safety analysis for expressways , 2019 , Transportation Research Part C: Emerging Technologies
71. Wan L., Yu C., Wang L., Ma W. , Identification of Time-of-Day Breakpoints Based on Trajectory Data of Probe Vehicles , 2019 , Transportation Research Record
72. Wang L., Jin Y., Wang L., Ma W., Li T. , Incentive-Based Approach to Control Demands for Operation of One-Way Carsharing System , 2019 , Transportation Research Record
73. Danesh A., Ma W., Wang L. , Policy solutions for transportation-related problems in Kabul: Lessons from major cities of China and India , 2019 , CICTP 2019: Transportation in China - Connecting the World - Proceedings of the 19th COTA International Conference of Transportation Professionals
74. Danesh A., Velaga N.R., Ma W. , User preferences regarding ridesourcing and informal intermediate public transport , 2019 , CICTP 2019: Transportation in China - Connecting the World - Proceedings of the 19th COTA International Conference of Transportation Professionals
75. Hao R., Qi X., Ma W., Wang L. , Connected vehicle control algorithm for all-way stop-controlled intersections , 2019 , CICTP 2019: Transportation in China - Connecting the World - Proceedings of the 19th COTA International Conference of Transportation Professionals
76. Wang L., Chen B., Yu C., Ma W. , A review of automotive head-up display , 2019 , CICTP 2019: Transportation in China - Connecting the World - Proceedings of the 19th COTA International Conference of Transportation Professionals
77. Ma W., Zou L., An K., Gartner N.H., Wang M. , A Partition-Enabled Multi-Mode Band Approach to Arterial Traffic Signal Optimization , 2019 , IEEE Transactions on Intelligent Transportation Systems
78. Huang K., Liu Z., Zhu T., Kim I., An K. , Analysis of the acceptance of park-and-ride by users: A cumulative logistic regression approach , 2019 , Journal of Transport and Land Use
79. Bian R.R., Wilmot C.G., Wang L. , Estimating spatio-temporal variations of taxi ridership caused by Hurricanes Irene and Sandy: A case study of New York City , 2019 , Transportation Research Part D: Transport and Environment
80. Chen L., Ma W., Olaverri-Monreal C. , Welcome message from the IEEE SCI 2018 program chairs , 2018 , Proceedings - 2018 IEEE SmartWorld, Ubiquitous Intelligence and Computing, Advanced and Trusted Computing, Scalable Computing and Communications, Cloud and Big Data Computing, Internet of People and Smart City Innovations, SmartWorld/UIC/ATC/ScalCom/CBDCom/IoP/SCI 2018
81. Wu W., Liu Y., Ma W.-J., Long K.-J. , Left Turn Forbiddance Model Considering Capacity Matching Between Upstream and Downstream Intersections along Arterial Road [考虑上下游通行能力匹配的干线禁左模型] , 2018 , Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology
82. Wang L., Zhong Y., Ma W. , GPS-data-driven dynamic destination prediction for on-demand one-way carsharing system , 2018 , IET Intelligent Transport Systems
83. Li L., Hao R., Ma W., Qi X., Diao C. , Swarm Intelligence Based Algorithm for Management of Autonomous Vehicles on Arterials , 2018 , SAE Technical Papers
84. Zhao J., Ma W., Head K.L., Han Y. , Improving the operational performance of two-quadrant parclo interchanges with median U-turn concept , 2018 , Transportmetrica B
85. Yu C., Feng Y., Liu H.X., Ma W., Yang X. , Integrated optimization of traffic signals and vehicle trajectories at isolated urban intersections , 2018 , Transportation Research Part B: Methodological
86. Zhao J., Ma W. , Optimizing vehicle and pedestrian trade-off using signal timing in intersections with center transit lanes , 2018 , Journal of Transportation Engineering Part A: Systems
87. Zhang N., Yang X., Ma W. , Empirical Approximation for the Stochastic Fundamental Diagram of Traffic Flow on Signalized Intersection , 2018 , Journal of Advanced Transportation
88. Ji Y.B., Ma W., Zhang S.-Y. , Empirical analysis of bus travel time reliability: A case study in Shanghai , 2018 , International Journal of Industrial and Systems Engineering
89. Huang K., Gu Y., Yang H., An K., Liu Z. , Mathematical models for the matching and routing problem of customized bus service with multiple origins and destinations , 2018 , CICTP 2017: Transportation Reform and Change - Equity, Inclusiveness, Sharing, and Innovation - Proceedings of the 17th COTA International Conference of Transportation Professionals
90. Cai Q., Abdel-Aty M., Lee J., Wang L., Wang X. , Developing a grouped random parameters multivariate spatial model to explore zonal effects for segment and intersection crash modeling , 2018 , Analytic Methods in Accident Research
91. Yasmin S., Eluru N., Wang L., Abdel-Aty M.A. , A joint framework for static and real-time crash risk analysis , 2018 , Analytic Methods in Accident Research
92. Wang L., Abdel-Aty M., Wang X., Yu R. , Analysis and comparison of safety models using average daily, average hourly, and microscopic traffic , 2018 , Accident Analysis and Prevention
93. Feng Y., Yu C., Xu S., Liu H.X., Peng H. , An Augmented Reality Environment for Connected and Automated Vehicle Testing and Evaluation∗ , 2018 , IEEE Intelligent Vehicles Symposium, Proceedings
94. Feng Y., Yu C., Liu H.X. , Spatiotemporal intersection control in a connected and automated vehicle environment , 2018 , Transportation Research Part C: Emerging Technologies
95. Ma W., Liu Y., Zhao J., Wu N. , Increasing the capacity of signalized intersections with left-turn waiting areas , 2017 , Transportation Research Part A: Policy and Practice
96. Shen L., Yao Z., Ma W., Sheng D. , Constant Speed Based Traffic Platoon Dispersion Model in Cross-Sectional Vehicle Infrastructure Communication Environment , 2017 , Tongji Daxue Xuebao/Journal of Tongji University
97. Ma W.-J., Liu Y., Liu H.-D., Zhao J. , Impact of Short Left-turn Lane on Maximum Throughput of Signalized Intersection , 2017 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
98. Yu C., Ma W., Han K., Yang X. , Optimization of vehicle and pedestrian signals at isolated intersections , 2017 , Transportation Research Part B: Methodological
99. Zhao J., Ma W.-J., Han Y. , Integrated Optimization Model of Layouts and Signal Timings of Exit-lanes for Left-turn Intersections , 2017 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
100. Hao H., Ma W. , Revisiting distribution model of departure headways at signalised intersections , 2017 , Transportmetrica B
101. Yu C., Ma W., Lo H.K., Yang X. , Robust Optimal Lane Allocation for Isolated Intersections , 2017 , Computer-Aided Civil and Infrastructure Engineering
102. Huang K., An K. , Research papers - Modelling the dynamic one-way car sharing system , 2017 , ATRF 2017 - Australasian Transport Research Forum 2017, Proceedings
103. An K., Lo H.K. , Transit network design with stochastic demand , 2017 , Modelling Intelligent Multi-Modal Transit Systems
104. Jing W., An K., Ramezani M., Kim I. , Location Design of Electric Vehicle Charging Facilities: A Path-Distance Constrained Stochastic User Equilibrium Approach , 2017 , Journal of Advanced Transportation
105. An K., Xie S., Ouyang Y. , Reliable Sensor Location for Object Positioning and Surveillance via Trilateration , 2017 , Transportation Research Procedia
106. Guan S., Su Z., Li J. , Optimization of number of parking space and parking rates for the on-street metered parking: A case study of guangzhou CBD , 2017 , Transport and Society - Proceeding of the 22nd International Conference of Hong Kong Society for Transportation Studies, HKSTS 2017
107. Yu C., Ma W., Yang X. , Integrated optimization of location and signal timings for midblock pedestrian crosswalk , 2016 , Journal of Advanced Transportation
108. Zhao J., Ma W., Liu Y., Han K. , Optimal operation of freeway weaving segment with combination of lane assignment and on-ramp signal control , 2016 , Transportmetrica A: Transport Science
109. Sun X., Ma W., Huang W. , Comparative study on the capacity of a signalised roundabout , 2016 , IET Intelligent Transport Systems
110. Zhao J., Ma W.-J., Wang T., Liao D.-B. , Coordinated perimeter flow control for two subareas with macroscopic fundamental diagrams , 2016 , Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology
111. Zhao J., Ma W., Li P. , Optimal design of midblock crosswalk to achieve trade-off between vehicles and pedestrians , 2016 , Journal of Transportation Engineering
112. Cao G., Wang L., Jin Y., Yu J., Ma W., Liu Q., He A., Fu T. , Determination of the vehicle relocation triggering threshold in electric car-sharing system , 2016 , Lecture Notes in Electrical Engineering
113. Huang W., Ma W., Viti F., Tampère C.M.J. , An Optimization-Based Iterative Learning Method for Anticipatory Network Traffic Control , 2016 , CICTP 2016 - Green and Multimodal Transportation and Logistics - Proceedings of the 16th COTA International Conference of Transportation Professionals
114. Wang L., Ma W., Zuo Z. , Smart-Phone Trace Segmentation for Trip Information Extraction , 2016 , CICTP 2016 - Green and Multimodal Transportation and Logistics - Proceedings of the 16th COTA International Conference of Transportation Professionals
115. Ji Y., Mo C., Ma W., Liao D. , Feedback Gating Control for Network Based on Macroscopic Fundamental Diagram , 2016 , Mathematical Problems in Engineering
116. Lin D., Ma W., Li L., Wang Y. , A driving force model for non-strict priority crossing behaviors of right-turn drivers , 2016 , Transportation Research Part B: Methodological
117. Zhao J., Ma W., Head K.L., Yang X. , Optimal operation of displaced left-turn intersections: A lane-based approach , 2015 , Transportation Research Part C: Emerging Technologies
118. Ma W., Han B., An K., Zhang N. , Investigating the applicability of exclusive pedestrian phase at two-phase actuated controlled intersections , 2015 , Journal of Advanced Transportation
119. Ma W., Liao D., Liu Y., Lo H.K. , Optimization of pedestrian phase patterns and signal timings for isolated intersection , 2015 , Transportation Research Part C: Emerging Technologies
120. Ma W.-J., Ye X.-C., Liao D.-B., Bai Y. , Distribution characteristics of accepted gap and rejected gap for vehicles crossing stop-controlled intersections , 2015 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
121. Yu C.-H., Yang X.-G., Ma W.-J. , Optimization method for management mode and scale of taxi pick-up zone with stochastic demand , 2015 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
122. Ma W., Liao D., Bai Y. , Empirical analysis of countdown signals on pedestrian behaviour , 2015 , Proceedings of the Institution of Civil Engineers: Transport
123. Wang Y., Ma W., Henrickson K.C., Wang Y., Yang X. , Dynamic lane assignment approach for freeway weaving segment operation , 2015 , Transportation Research Record
124. Zhao J., Ma W., Head K.L., Yang X. , Dynamic turning restriction management for signalized road network , 2015 , Transportation Research Record
125. Liu X., Ma W. , Logic Rule-Based Bus Rapid Transit Signal Priority of Controlling Overflow for Bus on Schedule , 2015 , CICTP 2015 - Efficient, Safe, and Green Multimodal Transportation - Proceedings of the 15th COTA International Conference of Transportation Professionals
126. Wu W., Ma W., Long K. , Capacity matching based model for protected left turn phases design of adjacent signalized intersections along arterial roads , 2015 , Promet - Traffic - Traffico
127. An K., Lo H.K. , Robust transit network design with stochastic demand considering development density , 2015 , Transportation Research Part B: Methodological
128. An K., Lo H.K. , Robust Transit Network Design with Stochastic Demand Considering Development Density , 2015 , Transportation Research Procedia
129. Ma W., Liao D. , Progress and prospects of macroscopic fundamental diagram , 2014 , Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering)
130. Ma W., Liu Y., Head K.L. , Optimization of pedestrian phase patterns at signalized intersections: A multi-objective approach , 2014 , Journal of Advanced Transportation
131. Wang Y., Ma W., Yin W., Yang X. , Implementation and testing of cooperative bus priority system in connected vehicle environment , 2014 , Transportation Research Record
132. Ma W., Li L., Wu Z. , Investigation of the performance of two-way left-turn lane on roads with staggered intersections , 2014 , Canadian Journal of Civil Engineering
133. Zhao J., Ma W., Yang X. , Signal control model for mid-block pedestrian crossing with consideration of downstream intersection , 2014 , Tongji Daxue Xuebao/Journal of Tongji University
134. Zhao J., Ma W., Liu Y., Yang X. , Integrated design and operation of urban arterials with reversible lanes , 2014 , Transportmetrica B
135. Wu W., Ma W.-J., Yang X.-G. , Route based signal coordination control model within vehicle infrastructure integration environment , 2014 , Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition)
136. Feng Y., Head K.L., Ma W. , Estimating vehicles in the dilemma zone and application to fixed-time coordinated signal optimization , 2014 , Transportation Research Record
137. Zhao J., Ma W., Head K.L., Yang X. , Optimal intersection operation with median U-turn: Lane-based approach , 2014 , Transportation Research Record
138. Liao D., Ma W., Bai Y. , Unconventional impacting factors of gap acceptance at stop sign-controlled intersections , 2014 , CICTP 2014: Safe, Smart, and Sustainable Multimodal Transportation Systems - Proceedings of the 14th COTA International Conference of Transportation Professionals
139. Wang J., Ma W., Yang X. , Development and evaluation of intellidrive-enabled emergency vehicle preemption control algorithm , 2014 , CICTP 2014: Safe, Smart, and Sustainable Multimodal Transportation Systems - Proceedings of the 14th COTA International Conference of Transportation Professionals
140. Yang X.-G., Zhao J., Ma W.-J., Bai Y. , Review on calculation method for signalized intersection capacity , 2014 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
141. Wu W., Ma W.-J., Yang X.-G. , Dynamic speed-based signal offset optimization model within vehicle infrastructure integration environment , 2014 , Kongzhi Lilun Yu Yingyong/Control Theory and Applications
142. Wang J., Ma W., Yang X. , Priority degree partition model for emergency traffic flow preemption control , 2014 , Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition)
143. Ma W., Head K.L., Feng Y. , Integrated optimization of transit priority operation at isolated intersections: A person-capacity-based approach , 2014 , Transportation Research Part C: Emerging Technologies
144. An K., Lo H.K. , Service reliability-based transit network design with stochastic demand , 2014 , Transportation Research Record
145. An K., Lo H.K. , Robust transit network design under demand uncertainty considering development density , 2014 , Proceedings of the 19th International Conference of Hong Kong Society for Transportation Studies, HKSTS 2014 - Transportation and Infrastructure
146. An K., Lo H.K. , Ferry service network design with stochastic demand under user equilibrium flows , 2014 , Transportation Research Part B: Methodological
147. Wang J., Ma W., Yang X. , Development of degree-of-priority based control strategy for emergency vehicle preemption operation , 2013 , Discrete Dynamics in Nature and Society
148. Ma W., Ni W., Head L., Zhao J. , Effective coordinated optimization model for transit priority control under arterial progression , 2013 , Transportation Research Record
149. You X., Li L., Ma W. , Coordinated optimization model for signal timings of full continuous flow intersections , 2013 , Transportation Research Record
150. Zhao J., Ma W., Zhang H.M., Yang X. , Two-step optimization model for dynamic lane assignment at isolated signalized intersections , 2013 , Transportation Research Record
151. Ma W., Xie H., Liu Y., Head L., Luo Z. , Coordinated optimization of signal timings for intersection approach with presignals , 2013 , Transportation Research Record
152. Zhao J., Ma W., Zhang H.M., Yang X. , Increasing the capacity of signalized intersections with dynamic use of exit lanes for left-turn traffic , 2013 , Transportation Research Record
153. Ma W., Liu Y., Yang X. , A dynamic programming approach for optimal signal priority control upon multiple high-frequency bus requests , 2013 , Journal of Intelligent Transportation Systems: Technology, Planning, and Operations
154. Ma W.-J., Xie H.-Z. , Integrated control of main-signal and pre-signal on approach of intersection with double stop line , 2013 , Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition)
155. Ma W., Liu Y., Han B. , A rule-based model for integrated operation of bus priority signal timings and traveling speed , 2013 , Journal of Advanced Transportation
156. Ma W.-J., Wu M.-M., Han B.-X., Liu H.-D., Wu H.-Y. , Bus signal priority control method for isolated intersection based on dynamic variable speed adjustment , 2013 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
157. Ma W.-J., Xie H.-Z., Bai Y., Zhao J., Yang X.-G. , Signal timing optimization model based on dual-ring phase scheme for roundabout , 2013 , Journal of Central South University
158. Ma W., Liu Y., Head L., Yang X. , Integrated optimization of lane markings and timings for signalized roundabouts , 2013 , Transportation Research Part C: Emerging Technologies
159. Ma W.-J., Ye X.-C. , Optimal offline cycle length model based on online bus priority demand , 2013 , Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology
160. Wu W., Ma W., Yang X. , Integrated optimization method for left-turn phases of adjacent junctions , 2013 , Tongji Daxue Xuebao/Journal of Tongji University
161. An K. , Robust transit network design with stochastic demand considering development density , 2013 , Proceedings of the 18th International Conference of Hong Kong Society for Transportation Studies, HKSTS 2013 - Travel Behaviour and Society
162. Lo H.K., An K., Lin W.-H. , Ferry service network design under demand uncertainty , 2013 , Transportation Research Part E: Logistics and Transportation Review
163. Lu Y., Ma W., You X. , Simulation-based comprehensive evaluation of left-turn-waiting-zone at signalized intersection with separated left turn phases , 2012 , CICTP 2012: Multimodal Transportation Systems - Convenient, Safe, Cost-Effective, Efficient - Proceedings of the 12th COTA International Conference of Transportation Professionals
164. Ma W., Lu Y., An K., Zhao J. , Probabilistic model for signalized intersection capacity with short lanes , 2012 , Tongji Daxue Xuebao/Journal of Tongji University
165. Ma G.-S., Ma W.-J. , Improved left-turn conflict delay model at two-phase intersection , 2012 , Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology
166. Xie H., Ma W. , Simulation-based study on a pre-signal control system at isolated intersection with separate left turn phase , 2012 , Proceedings of 2012 9th IEEE International Conference on Networking, Sensing and Control, ICNSC 2012
167. Wu Z., Fan Y., Ma W. , Spot speed prediction model based on grey neural network , 2012 , Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University
168. Yu J., Liu Y., Chang G.-L., Ma W., Yang X. , Locating urban transit hubs: Multicriteria model and case study in China , 2012 , Journal of Transportation Engineering
169. Ma W., Xie H., Han B. , Development and evaluation of an economic-driving assistance program for transit vehicles , 2012 , Energies
170. Ma W., Xie H. , Bus signal priority strategy for isolated intersection with far-side bus stop , 2011 , Tongji Daxue Xuebao/Journal of Tongji University
171. Huang C., Ma W. , A statistical analysis of pedestrian speed on signalized intersection crosswalk , 2010 , ICCTP 2010: Integrated Transportation Systems: Green, Intelligent, Reliable - Proceedings of the 10th International Conference of Chinese Transportation Professionals
172. Yang X., Huang W., Ma W. , Method of delimiting urban traffic signal coordinate control subarea under oversaturated condition , 2010 , Tongji Daxue Xuebao/Journal of Tongji University
173. Ma W., Liu Y., Yang X. , Investigating the impacts of green signal countdown devices: Empirical approach case study in China , 2010 , Journal of Transportation Engineering
174. Ma W.-J., Yang X.-G. , Lane-based optimization model of passive bus priority control for isolated intersection , 2010 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
175. Ma W., Nie L., Yang X. , Phase sequencing model for signalized isolated intersection based on lost time , 2010 , Tongji Daxue Xuebao/Journal of Tongji University
176. Ma W., Yang X., Liu Y. , Development and evaluation of a coordinated and conditional bus priority approach , 2010 , Transportation Research Record
177. Ma W., Yang X. , Signal coordination models for midblock pedestrian crossing and adjacent intersections , 2009 , 2009 2nd International Conference on Intelligent Computing Technology and Automation, ICICTA 2009
178. Yu J., Liu Y., Chang G.-L., Ma W., Yang X. , Cluster-based hierarchical model for urban transit hub location planning: Formulation, solution, and case study , 2009 , Transportation Research Record
179. Ma W., Yang X. , Serve sequence optimization of multiple bus signal priority requests based on dynamic programming , 2009 , Qinghua Daxue Xuebao/Journal of Tsinghua University
180. Ma W., Li X., Yang X. , Incidence degree model of signalized intersection group based on routes , 2009 , Tongji Daxue Xuebao/Journal of Tongji University
181. Ma W., Wu Z., Yang X. , Coordinated intersection-group bus signal priority control approach , 2009 , Tumu Gongcheng Xuebao/China Civil Engineering Journal
182. Zhong Z., Liu H., Ma W., Long K. , An optimization method of dynamic lane assignment at signalized intersection , 2008 , Proceedings - International Conference on Intelligent Computation Technology and Automation, ICICTA 2008
183. Ma W., Bai Y. , Serve sequence optimization approach for multiple bus priority requests based on decision tree , 2008 , Proceedings of the 7th International Conference of Chinese Transportation Professionals Congress 2007: Plan, Build, and Manage Transportation Infrastructures in China
184. Ma W., Xiaoguang Y. , Design method of U-turn between adjacent intersections for bus priority , 2008 , Proceedings of the 8th International Conference of Chinese Logistics and Transportation Professionals - Logistics: The Emerging Frontiers of Transportation and Development in China
185. Ma W., Yang X. , Coordination design of left movements of signalized intersections group , 2008 , Tongji Daxue Xuebao/Journal of Tongji University
186. Ma W.-J., Yang X.-G. , Efficiency analysis of transit signal priority strategies on isolated intersection , 2008 , Xitong Fangzhen Xuebao / Journal of System Simulation
187. Ma W., Yang X. , A passive transit signal priority approach for Bus Rapid Transit System , 2007 , IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC
188. Nie L., Yang X.-G., Ma W.-J., Zeng Y. , Optimization model and simulation analysis for pre-timed signals at isolated intersections , 2007 , International Conference on Transportation Engineering 2007, ICTE 2007
189. Ma W., Yang X., Yun M. , Transit signal priority strategies based on the consideration of bus frequency , 2007 , Tongji Daxue Xuebao/Journal of Tongji University
190. Ma W.-J., Nie L., Yang X.-G. , Optimization model and simulation analyses of pre-timed signals control at isolated intersections , 2007 , Xitong Fangzhen Xuebao / Journal of System Simulation
191. Ma W.-J., Yang X.-G. , Transit passive priority control method based on isolated intersection of optimization of time-space , 2007 , Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
192. Yang X., Ma W., Shen F. , An advanced bus signal priority control system and its application in China , 2007 , 14th World Congress on Intelligent Transport Systems, ITS 2007
193. Yang X., Yuan C., Shen F., Ma W. , Feedback control strategy for isolated intersections , 2006 , IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC
194. Yang X., Chu H., Wu Z., Pang Y., Ma W. , System structure and test research of apts based on zigbee technology in China , 2006 , 13th World Congress on Intelligent Transport Systems and Services
195. Ma W.-J., Lin Yu., Yang X.-G. , Design method of pedestrian phases at multi-phase signal intersection , 2004 , Journal of Traffic and Transportation Engineering
在研:
1. 国家杰出青年科学基金(52325210):道路交通主动控制,2024.01-2028.12
2. 国家自然科学基金面上基金(52372333):面向高速公路连锁冲突的车路协同避险调控方法研究,2024.01-2027.12
3. 国家自然科学基金面上基金(52272336):智能网联混合交通流交叉口自主协同控制,2023.01-2026.12
4. 国家自然科学基金重点基金(52131204):智能网联新型混合交通流协同控制,2022.01-2026.12
5. 国家自然科学基金青年基金(52402407):多模式交通需求预测可解释性深度学习方法,2025.01-2027.12
6. 国际自然科学基金青年基金(52302411):模型-数据混合驱动的拥堵路网动态边界控制,2024.01-2026.12
7. 国家自然科学基金青年基金(52102415):连续交通流路段-车群事故风险解析,2022.01-2024.12
8. 上海-科委,大型会展道路交通圈层协同调控与出行预约技术研究,2020.09-2023.08
已结题:
1. 国家自然科学基金青年基金(61903276):新型混合交通流粒流一致性控制,2020.01-2022.12
2. 国家重点研发计划课题:场景目标导向的交通组织与控制协同优化方法, 2019.02-2021.12
3. 国家自然科学基金委优秀青年基金:城市道路交通设计与优化(51722809),2018/01-2020/12
4. 上海-科委,交通拥堵智能主动管控与评估技术研究,2019.10-2021.09
5. 霍英东青年教师基金:交叉口新型通行模式适应性与优化方法研究(151076),2016.3-2019.3
6. 国家自然科学基金(国际合作交流项目):城镇化过程中的道路交通设计与优化(5161101471),2017/01-2017/12
7. 中央高校基本科研业务费专项资金项目:非常规平面信号交叉口优化控制技术,2016.1-2016.12
8. 上海市浦江人才计划:基于网络态势信息的城市道路交叉口群过饱和控制理论与方法研究(14PJD033),2014.9-2016.8
9. 江苏省现代城市交通技术协同创新中心项目:不确定需求下城市道路交叉口优化设计方法研究,2014.6-2017.6
10. 国家自然科学基金项目:交叉口排队溢流主动控制理论与优化方法研究(51178345), 2012.1-2015.12
11. 国家自然科学基金项目:专用道优先控制与公交调度协调优化方法研究”(50808142),2009.1-2011.12
12. 车路协同与安全控制北京市重点实验室开放课题:面向节能减排的车队速度引导与信号配时协调优化方法研究,2013.5-2014.5
13. 交通运输部西部项目子课题:快速公交系统信号优先与智能调度技术研究,2011.1-2013.12
已授权:
1. 马万经,刘烨.一种信控交叉口左转交通组合设计优化方法,201710238955.4
2. 马万经,刘兴永.一种交叉口公交停靠站溢流控制方法.ZL201410785471.8
3. 马万经,吴明敏.基于卡尔曼滤波法的城市道路与交叉口评价方法. ZL201410850810.6
4. 马万经,倪威.一种面向快速路交织区车道动态划分控制方法ZL201410101167.7
5. 马万经,赵靖,杨晓光.一种交叉口动态车道功能控制的实施方法ZL201210134256.2
6. 王嘉文,马万经,杨晓光. 一种基于紧急交通流优先级别多层模糊的划分方法ZL201210153089.6
7. 马万经,袁见. 一种基于浮动车轨迹数据的复合路网瓶颈点识别方法,201910074831.6
8. 马万经,袁见,俞春辉,王. 玲. 一种拥堵交通流溯源分析方法,201910978947.2
9. 马万经、黄望月. 一种基于轨迹数据的干线交叉口协调控制方法, 201910304256.4
10. 马万经,李金珏、俞春辉. 一种混合交通流环境下自动驾驶专用道交叉口控制方法, 202110830537
11. 马万经、郑喆、王玲、俞春辉. 一种基于储备通行能力的热点片区交通组织控制协同方法, 202110908433.7
12. 俞春辉、万丽娟、马万经、王玲. 一种单点信号交叉口的车道分配方法, 202010450675.1
13. 马万经、孙宇轩、欧诗琪、王玲. 一种面向公交优先的交叉口群多路径协调随机优化方法, 202111260584.2
14. 王 玲、邹菱洁、马万经、朱梓桐、孙佳杭、李若松. 一种基于双重匹配的全域车辆轨迹握手拼接方法, 202310294662.3
15. 孙拓;马万经;郝若辰;陈蓓;林启恒;陈奔玮.一种考虑路网容量约束的分布式主动均衡管控方法.CN202110892236.0
16. 马万经;林启恒;赫子亮;王玲;俞春辉一种道路通行能力与网联自动驾驶车当量系数估计方法. CN201910978887.4
17. 王玲;王康;马万经;俞春辉;安琨一种快速路拥堵风险分级实时预测方. 法CN202110600439.8
18. 马万经;陈奔玮;王玲;俞春辉一种信控交叉口信号时序控制方法及优化方法. CN202010287087.0
19. 马万经;刘烨一种信控交叉口左转交通组合设计优化方法. CN201710238955.4
20. 王玲;邹菱洁;马万经一种智能网联环境下的安全致因影响范围获取方法. CN202210455990.2
21. 马万经;欧诗琪;王玲;余婧婷;刘圣月;马卓公交动态速度引导-驻站控制-信号优先协同控制方法. CN202110772712.5
22. 郝若辰;马万经一种基于地图的交通信号控制方案生成方法. CN201710840220.9
23. 马万经;付涛;邹莉;俞春晖;孙伟力;龚诚车辆行驶状态的确定方法、装置及电子设备. CN201811478582.9
已受理:
1. 俞春辉、陈子轩、马万经、王玲. 一种信号交叉口交通信号灯和车辆轨迹控制方法. 202010408238.3
2. 马万经、袁见、俞春辉、王玲. 一种面向公交信号优先高频多申请的动态控制方法. 202010287082.8
4. 俞春辉、万丽娟、马万经、王玲. 一种单点信号交叉口的车道分配方法. 202010450675.1
5. 马万经,吴冕,钟志华,俞春辉,王玲. 一种需求响应型公交调度方法,201911160258.7
6. 马万经,郑喆. 一种多带宽干道公交控制方案的优化方法,201910092239.9
7. 马万经,万丽娟,陈蓓,黄望月,付涛. 一种数据驱动的交叉口信号控制评价系统,201910074865.5
8. 马万经,欧诗琪,王玲,俞春辉. 一种网联公交车到站停靠管理优化方法,201911054958.8
9. 马万经,汪磊,钟志华,吴兵. 智慧公交系统及实现方法,201910542819.3
10. 马万经,黄望月. 一种基于轨迹数据的干线交叉口协调控制方法,201910304256.4
11. 马万经,万丽娟,俞春辉,王玲. 一种基于轨迹数据的信号控制时段划分方法,201910978916.7
14. 马万经,郝若辰. 一种基于路侧设备的分布式交通控制系统,201710840565.4
15. 马万经、郝若辰、王浩然、刁晨雪、戚新洲、毕浩楠. 一种面向网联自动驾驶车辆的交叉口自组织控制方法, ZL2017 1 0059516.7
16. 马万经、郝若辰、王浩然、刁晨雪、戚新洲、毕浩楠. 一种基于仿生学的自动驾驶车辆运行控制方法, ZL2017 1 0059510.X
18. 马万经,刘圣月、俞春辉、王玲. 一种面向纯网联环境的单点交叉口车辆控制方法, ZL 2021 1 0825811.5
联系电话:021-59980132
管理员邮箱:2410194@tongji.edu.cn,2431730@tongji.edu.cn
详细地址:上海市嘉定区曹安公路4800号通达馆
邮政编码:201804