Fengjiao Liu
Short Bio
Postdoctoral Fellow, Aerospace Engineering, Georgia Institute of Technology, 2021 - Now
Postdoctoral Associate, Electrical Engineering, Yale University, 2020 - 2021
PhD, Electrical Engineering, Yale University, 2014 - 2020
Engineer, Micron Semiconductor Asia, Singapore, 2012 - 2014
BE, Electrical & Electronic Engineering, Nanyang Technological University, 2008 - 2012
Research Overview
Structural properties and graphical characterizations of systems
Critical algebraic properties (such as the controllability and the existence of fixed eigenvalues) of a dynamical system are inspected and then converted into equivalent graphical properties of the system’s network representations. This work provides a guide to designing complex networks and helps reveal crucial underlying mechanisms of networks and collective behaviors in nature.
Distributed control of multi-channel dynamical systems
The first systematic procedures are given for effective control of multi-channel systems using distributed controllers, which broadens our knowledge of how distributed control can fundamentally improve system performance by allowing local communication. There is still much work to be done along this direction. This work can be potentially implemented to smart grids and home automation systems.
Optimal control of the evolution of uncertainty in stochastic systems
The fundamental questions are answered on the existence and uniqueness of the optimal control law for steering the state covariance of a stochastic system over a finite time horizon and how to compute the optimal control. With the advantage of directly controlling and quantifying the uncertainty in stochastic systems, these results can be applied to various motion planning scenarios.
Selected Publications & Preprints
F. Liu*, G. Rapakoulias, and P. Tsiotras, “Optimal covariance steering for discrete-time linear stochastic systems,” IEEE Transactions on Automatic Control, under review.
F. Liu* and P. Tsiotras, “Optimal covariance steering for continuous-time linear stochastic systems with multiplicative noise,” IEEE Transactions on Automatic Control, under review.
F. Liu* and P. Tsiotras, “Optimal covariance steering for continuous-time linear stochastic systems with additive martingale noise,” IEEE Transactions on Automatic Control, major revision.
F. Liu, L. Wang*, D. Fullmer, and A. S. Morse, “Distributed feedback control of multi-channel linear systems,” IEEE Transactions on Automatic Control, accepted.
F. Liu* and A. S. Morse, “Structural completeness of a multi-channel linear system with dependent parameters,” IEEE Transactions on Automatic Control, vol. 67, no. 1, pp. 267–278, 2022.
F. Liu* and A. S. Morse, “A graphical characterization of structurally controllable linear systems with dependent parameters,” IEEE Transactions on Automatic Control, vol. 64, no. 11, pp. 4484–4495, 2019.
F. Liu* and A. S. Morse, “What does it take to control a multi-channel linear system with distributed feedback?” IEEE Conference on Decision and Control, 2020.
L. Wang*, D. Fullmer, F. Liu, and A. S. Morse, “Distributed control of linear multivariable systems: summary of results,” American Control Conference, 2020.
F. Liu* and A. S. Morse, “When does a multi-channel linear system have a structurally fixed spectrum?” IEEE Conference on Decision and Control, 2019.
F. Liu* and A. S. Morse, “Structural controllability of linear systems,” IEEE Conference on Decision and Control, 2017.
Y. Li*, F. Liu, and A. S. Morse, “A distributed, dynamical system view of finite, static games,” Allerton Conference on Communication, Control, and Computing, 2017.
F. Liu*, A. S. Morse, and B. D. O. Anderson, “Robust control of undirected rigid formations with constant measurement bias in relative positions,” American Control Conference, 2016.
Teaching Experience
Instructor, AE 3531 Control System Analysis & Design, Georgia Institute of Technology, Fall 2022
Teaching Fellow, ENAS 151 Multivariable Calculus for Engineers, Yale University, Spring 2016
Peer Tutor, EE 2006 Engineering Mathematics I, Nanyang Technological University, Fall 2010
Professional Service
Reviewer of
IEEE Transactions on Automatic Control
IEEE Transactions on Control of Network Systems
IEEE Transactions on Systems, Man and Cybernetics: Systems
Systems & Control Letters
IEEE Conference on Decision and Control 2016 – 2022
American Control Conference 2018 – 2023
IFAC Workshop on Distributed Estimation and Control in Networked Systems 2018
IEEE International Conference on Control & Automation 2019