|
CE Home > People > Faculty Directory > Henry Liu
Henry Liu
Assistant Professor
Contact Information:
- Office: CivE 136
- Phone: (612)625-6347
- Fax: (612)626-7750
- E-mail: henryliu@umn.edu
Web: http://www.ce.umn.edu/~liu/
Research Interests:
Major research interests include traffic control and operations, transportation network modeling, and traffic simulation. My current research activities include arterial data collection and signal optimization, real-time traffic management for emergency evacuation, analytical dynamic traffic assignment and application of microscopic traffic simulation models.
My research goal on the transportation network modeling is to develop operational wide-area traffic network management model under both recurrent congestion and incident/evacuation scenarios. This challenging problem requires in-depth multi-disciplinary knowledge in transportation network modeling, mathematical programming, and feedback control theory. For the incident / evacuation scenarios, the assumption of user equilibrium route choice behavior becomes questionable. Therefore I am currently working towards the development of adaptive feedback control models for the management of network traffic flow. In this scheme, the strong assumption on the user equilibrium route choice behavior is removed and only short-term evacuation behavior is assumed for effective traffic management with this closed-loop nature.
As part of my research work in the area of traffic simulation and control, I have developed a number of plug-in modules using the application programming interfaces (API) provided by PARAMICS, one of the most widely used microscopic traffic simulation software. Such plug-in modules as dual- ring actuated signal, signal coordination and actuated ramp metering control have been used by other research institutions and California Department of Transportation (Caltrans). Currently, I am undertaking several research projects on the microscopic traffic simulation sponsored by Caltrans. These projects include distributed simulation modeling, hardware-in-the-loop simulation, signal optimization, and simulation model calibration, etc.
Selected Publications:
Chu, L., Liu, H., and Recker, W. 2004. Evaluation of Potential ITS Strategies under Non- recurrent Congestion Using Microscopic Simulation. Journal of Transportation Research Board, 1886: 76-84.
Yang, F., Yin, Z., Liu, H., and Ran, B. 2004. An On-line Recursive Short-term Traffic Prediction Algorithm. Transportation Research Record, 1879: 1-8.
Liu, H., Recker, W., and Chen, A. 2004. Uncovering the Contribution of Travel Time Reliability to Dynamic Route Choice Using Real-time Loop Data. Transportation Research, Part A, 38: 435-453.
Chu, L., Liu, H., Recker, W., and Zhang, H. M. 2004. Performance Evaluation of Adaptive Ramp Metering Algorithms in Paramics Simulation. Journal of Transportation Engineering, 130(3): 330-338.
Liu, H., Ban, J., Ran, B., and Mirchandani, P. 2003. Formulation and Solution Algorithm for Fuzzy Dynamic Traffic Assignment Model. Journal of Transportation Research Board, 1854: 114-123.
Yang, F., Liu, H., He, R., Ban, X., and Ran, B. 2003. Bi-level Formulation for Optimal Traffic Information Dissemination. Journal of Transportation Research Board, 1836: 21-28.
Sun, H., Liu, H., Xiao, H., He, R., and Ran, B. 2003. Short Term Traffic Forecasting Using the Local Linear Regression Model. Journal of Transportation Research Board, 1836: 143-150.
Liu, H., Oh, J., and Recker, W. 2002. Adaptive Signal Control with On-line Performance Measure. Journal of Transportation Research Board, 1811: 131-138.
Liu, H., Ban, J., Ran, B., and Mirchandani, P. 2002. An Analytical Dynamic Traffic Assignment Model with Stochastic Network and Travelers’ Perceptions. Journal of Transportation Research Board, 1783: 125-133.
Liu, H., Oh, J. S., Chu, L., and Oh, S. 2001. On-line Traffic Signal Control Scheme with Real- time Delay Estimation Technology. Journal of Eastern Asia Society for Transportation Studies (EASTS), 4(4): 107-119.
Education:
- Ph.D., 2000, Civil Engineering (Transportation), University of Wisconsin at Madison
- B.S. 1993, Automotive Engineering, Tsinghua University, P. R. China.
Experience:
- Assistant Professor, Department of Civil and Environmental Engineering, Utah State University, 2003-2005
- Post-Doctoral Researcher, California PATH Program, University of California, Berkeley, 2000-2003
|
