At 14:00 on March 24, 2021, Professor Zhiyuan Liuat Southeast University was invited to give a lecture on the topic of "Data-driven traffic flow model based on Gaussian process" via a video conference held by Professor Tian-Liang Liu. About40 teachers and students participated in the video conference and discussed the study with thelecturer.
Classical traffic flow theories attempt to study the laws of road traffic flow operation and evolution through physical models, but such methods have certain shortcomings and cannot effectively use massive amounts of valuable traffic big data information. In order to accurately estimate the basic parameter relationships in traffic flow, Professor Liu's group proposed a new data-driven traffic flow model. The model is highly extensible and can use multi-source traffic big data to consider higher-dimensional traffic state variables (demand-side variables) and the impact of road supply conditions on the traffic state (supply-side variables). Furthermore, modeling the statistical relationship between them does not rely on the assumption of equilibrium; using machine learning models to replace traditional parameter modelswould improve the accuracy of traffic flow analysis. Professor Liu's group uses Gaussian process (GP) regression as the basic model to learn the basic relationship from demand-side variables and supply-side variables to traffic flow, andcosntructs simulation experiments to verify the effectiveness of the new model. The experimental results show The new model can capture the complex relationship between demand-side variables, supply-side variables, and traffic flow, and also shows its value in estimating dynamic road capacity.
Professor Liu’s logical and simple explanation brings theaudience new research enlightenment. The teachers and students had an in-depth discussion and exchange ideas with Professor Liu on the research topic.
Prof.Zhiyuan Liu is now aprofessor and deputy dean of School of Transportation, Southeast University.Hegot the Ph.D degreefrom the National University of Singapore In 2011, and then stayed on for one year of postdoctoral research.Before joining intoSoutheast University in 2015, he worked as a lecturer intheDepartment ofCivil Engineering, Monash University, Australia. From December 2017 to January 2018, he was a visiting scholar in the Department of Mathematics, University of Melbourne, Australia.Prof. Liu’s main research areas include transportation network planning and management,andtransportation big data analysis and modeling. So far, he has published more than 70 SCI/SSCI journal papers, which has beencitedformore than 3000 times inGoogle Scholar.He now serves as associate editors of ASCE Journal of Transportation Engineering and IET Intelligent Transport Systems, and editorial board members of Transportation Research Part E, Transportation Research Record,andJournal of Transport and Land Use.Prof. Liu has wonmore than 10 awardsofdomestic and international big data algorithm competition (all top three), including the KDD CUP champion (2020) and the second place (2019).
