Dr. Liu has worked on the research projects related to microwave passive and active networks, RF circuit design, radio systems and networking, numerical computation of electromagnetic scattering and propagation, hardware and software design of ground-penetrating radar systems, electromagnetic tomography, microwave telecommunication systems, electrical properties of rocks, and well logging. He is a member of Research Management Committee of Texas Department of Transportation. Dr. Liu is also an active member of the Institute of Electrical and Electronic Engineers (IEEE), Environmental and Engineering Geophysics Society (EEGS), and Society of Professional Well Logging Analysts (SPWLA). Research Areas Sensor technology Sensor physics Electromagnetic based sensors Laser distance sensors Moisture sensor MEMS sensors Sensor networking Subsurface detection and sensing Ground penetrating radar system hardware Ground penetrating radar simulation and data inversion Ultra-wide band antenna for GPR systems (air launched and ground coupled) Pulsed and FMCW ground penetrating radar Application of GPR system for surface, shallow and deep investigation in pavements Borehore radar Laser surface profiling Surface texture measurement systems (micro and macro textures) Scanning laser surface profiling Well logging Simulation of induction, lateral, and LWD logging tools Inversion of logging data Electromagnetic tomography DC electrode tools Rock physics and mixing laws (Archie's law, Bergman-Milton simple pole theory, and self-similar models) Measurement methods of electrical properties of rocks Through casing resistivity logging tools (simulation, hardware, and data interpretation) Tool response to anisotropic formations, and multi-component induction tools Physical scale modeling Pulsed electromagnetic logging tools (simulation, and hardware) Telemetry system for MWD tools Wired and wireless communications Digital data telemetry systems Wireless telemetry protocols Spread spectrum radios Radio hardware (radio system, RF circuit design, simulation, and implementation) Radio networking (protocol design and implementation) Broadband over power line (system planning, and survey instrumentation) RFID and RFID reader (protocols, circuit design and system set up) Microwave and RF circuit design RF power amplifier design Microwave system design RF front end design for radio and RF communication systems Biomedical applications Wireless data telemetry for medial applications Simulation and computation of electromagnetic biosensors MEMS radio for biomedical research
Zhong , Lili, Jing Li, Ashutosh Bhardwaj, L. C. Shen and R. Liu, "Computation of Tri-Axial Induction Logging Tools in Layered Anisotropic Dipping Formations," IEEE Transactions on Geoscience and Remote Sensing, VOL. 46, NO. 4, APRIL 2008.
Tsai, J.S.H., J.H. Lin, L.S. Shieh, S.M. Guo, and R. Liu, "Decentralized Observer-Based Tracker for Analog Systems with Saturating Actuators and State Constraints," Computers and Mathematics with Applications Vol. 55, No. 1, 1-22, January 2008.
Tsai, J.S.H., C.T. Wang, S.M. Guo, L.S. Shieh and R. Liu, "Observer-Based Digital Tracker for Maneuvering Target Described by the Continuous-Time Nonlinear Dynamic System," Proceedings of the Institution of Mechanical Engineers, Part G, Journal of Aerospace Engineering, Vol. 222, No. 2, 213-228, April 2008.
Tsai, J.S.H., C.L. Wei, S.M. Guo, L.S. Shieh, and R. Liu, "EP-Based Adaptive Tracker with Observer and Fault Estimator for Nonlinear Time-Varying Sampled-Data Systems Against Actuator Failures," Journal of the Franklin Institute Vol. 345, No. 5, pp. 508-535, August 2008.
Zhou, H.Q., L.S. Shieh, Q.G. Wang, and R. Liu, "Digital Design of Combined PI and State Feedback Controller for Nonlinear Stochastic Systems," IMA Journal of Mathematical Control & Information, Vol. 25, No. 3, 305-322, September 2008.
Wu, Dagang, J. Chen, and R. Liu, "An Efficient FDTD Method for Axially Symmetric LWD Environments,"IEEE Transactions on Geosciences and Remote Sensing, Vol. 46(6), 1652 - 1656, June 2008.
Zhong, L., J. Li, A. Bhardwaj, L.C. Shen, and R. Liu, "Computation of Tri-Axial Induction Logging Tools in Layered Anisotropic Dipping Formations," IEEE Transactions on Geoscience and Remote Sensing, October 2007.
Wu, D., J. Chen and C. Liu, "Numerical Evaluation of Effective Dielectric Properties of Three-Dimensional Composite Materials with Arbitrary Inclusions Using a Finite-Difference Time-Domain Method," Journal of Applied Physics, 102, 024107, 2007.
Kao, C-P., J. Li, H. Xing, Y. Wang, H. Dong, and R. Liu, "Measurement of Layer Thickness and Permittivity Using a New Multi-Layer Model from GPR Data," Transactions on Geoscience and Remote Sensing, August 2007.
Canelon, J.I., L.S. Shieh, R.C. Liu, and S.M. Guo, "Neural Network-Based Digital Redesign Approach for PID Control of Unknown Nonlinear Multivariable Systems," Dynamics of Continuous, Discrete and Impulsive Systems, Series B: Applications & Algorithms, Vol. 14, No. 3, 401-432, June 2007.
Canelon, J.I., R.S. Provence, L.S. Shieh, and R.C. Liu, "A Simple Recursive Method for Stationary Receiver Position Estimation Using GPS Difference Measurements," ISA Transactions, Vol. 46, No. 2, 147-155, April 2007.
Aditya Ekbote, Jing Li, Haobin Dong, Ying Wang, and Richard Liu, Study of Elastic Property of Asphalt Pavement Using GPR, IEEE Geoscience and Remote Sensing Conference, Denver, Colorado, July 31-August 4, 2006.
Dagang Wu, Ji Chen and Ce Richard Liu, Numerical Modeling of MWD Electromagnetic Responses Using a Unconditionally Stable Finite-Difference Time-Domain (FDTD) Method, IEEE Geoscience and Remote Sensing Conference, Denver, Colorado, July 31-August 4, 2006.
Chien-ping Kao, Jing Li, Ying Wang, Haobing Dong, and Richard Liu, Measurement of Layer Thickness and Permittivity Using a New Multi-Layer Model from GPR Data, 11th International Conference on Ground Penetrating Radar, June 19-22, 2006, Columbus Ohio, USA.
Ying Wang, C. Richard Liu, Jing Li, Yi Xiao and Chien-ping Kao, Comparison of Three Nanosecond Pulse Generating Methods in Pulsed GPR Applications, 11th International Conference on Ground Penetrating Radar, June 19-22, 2006, Columbus Ohio, USA.
Lianhe Guo, Xuemin Chen, Jing Li, Yumei Tang, and Richard C. Liu, A Novel Microwave Resonant Cavity Sensor for Weigh-in-Motion Applications, IEEE Transactions on Microwave Theory and Technology Symposium, San Francisco, California, June 11-16, 2006.
S. Shamsi, D.G. Wu, J. Chen, R. Liu, W.Kainz, and H.Bassen, SAR Evaluation in Pregnant Woman Models Radiated from MRI Birdcage Coil, IEEE Transactions on Microwave Theory and Technology Symposium, San Francisco, California, June 11-16, 2006.
S.J. Li, C. Liu, L.C. Shen, H.M. Wang, J. Ouyang, and G.J. Zhang, Identification and evaluation of fractured tight-sand oil reservoir in deep zone of Bohai Gulf, SPWLA Annual Conference, Veracruz, Mexico June 4-7, 2006.
Haobin Dong , Chuanlei Wang , Huaping Wang and Xinhui Cai, C. Richard Liu, Two-Dimensional Resistivity Imaging Survey for Detecting Termitaria in a Dam, 2006 IEEE International Conference On Networking, Sensing and Control Ft. Lauderdale, Florida, U.S.A. April 23-25, 2006.
Y. Tang, L. Guo, J. Li, X. Chen, and R. Liu, FDTD Simulation in Calculating Thickness of Subsurface Layer with GPR, Proceedings of IEEE International Conference on Networking, Sensing and Control, Ft. Lauderdale, to be published, April , 2006.
J. Li, R. Liu, X. Chen, H. Xing, and Y. Wang, A 3-D Real-Time Road Edge Detection System for Automated Smart Car Control, Proceedings of IEEE International Conference on Networking, Sensing and Control, Ft. Lauderdale, to be published, April , 2006.
H. Xing, J. Li, X. Chen, C. Richard Liu, Brian Michalk, Carl Bertrand, Ed Oshinski, German Claros, and Hua Chen, Simulation, modeling and application of ground penetrating radar in pavement dielectric constant and thickness measurement, Proceedings of SPIE conference: Smart Structures & Materials/NDE, San Diego, California, 26 February-2 March, 2006.
J. Chen, X. Chen, J. Li and R. Liu, Development of the RF Soil Moisture Sensors, Smart Structures and Materials, Proceedings of SPIE, San Diego, to be published, February , 2006.
Y. Chen, X. Chen, W. Sun, A. Ekbote and R. Liu, Methodology and Device in Measuring Thickness of Thermoplastic Tape in Real Time, Smart Structures and Materials, Proceedings of SPIE, San Diego, to be published, February , 2006.
W. Sun, X. Chen, Y. Chen, A. Ekbote and R. Liu, Auto-synchronized Laser Scanning Range Sensor for Thermoplastic Pavement Marking Material Thickness Measurement, Smart Structures and Materials, Proceedings of SPIE, San Diego, to be published, February , 2006.
Huichun Xing, Richard Liu, Jing Li, Xuemin Chen, "New Method for Pavement Dielectric Constant Measurement Using Ground-Penetrating Radar," Transportation Research Board Annual Meeting, January 2006, Washington DC.
Jing Li, C. Richard Liu, Zhiming Si, and German Claros, Measurement of Electrical Properties of Rocks Over 10KHz-1.1GHz, Transportation Research Board Annual Meeting, January 2006, Washington DC.
D. Wu, F. Yang, J. Chen, and Richard C. Liu, "MWD Tool / Small Antenna Analysis using Cylindrical Unconditional Stable FDTD Method," (invited) Asian-Pacific Microwave Conference, December, 2005.
Chien-ping Kao, Jing Li, Richard Liu, "Measurement of Layer Thickness and Permittivity Using a New Multi-Layer Model from GPR Data," Progress in electromagnetics Research Symposium (PIERS 2005), August 22-26, 2005, Hangzhou, China.
L. S. Shieh, Han-Qin Zhou, Ce Richard Liu and Qing-Guo Wang State-space Digital PID Controller Design for Linear Stochastic Multivariable Systems with Input Delay, The Fifth International Conference on Control and Automation, June 26-29, 2005, Budapest, Hungary.
L. Guo, X. Chen, J. Yu, Y. Tang, and R. Liu, Pavement Deflection Vehicle Weighing Method with Embedded Piezoelectric Sensor, Smart Structures and Materials, Proceedings of SPIE, San Diego, Vol. 5758, May 2005, pp471-478.
Huichun Xing, Jing Li, Richard Liu, "2.4GHz On-board Parallel Plate Soil Moisture Sensor System," Sensors for Industry Conference 05, Feb 8-10, 2005, Houston.