List of English Publication

@article{nokey,

title = {A Lyapunov Characterization of Prescribed Performance Control Systems},

author = {Yutian Wang and Tengfei Liu and Hyungbo Shim and George A. Rovithakis and Zhong-Ping Jiang},

doi = {10.1109/TAC.2024.3399090},

issn = {0018-9286},

year  = {2024},

date = {2024-11-01},

urldate = {2024-11-01},

journal = {IEEE Transactions on Automatic Control},

volume = {69},

issue = {11},

pages = {7917 - 7924},

abstract = {This paper contributes a Lyapunov formulation for prescribed performance controller designs. In particular, we first show that the closed-loop system of a typical class of prescribed performance control systems can be transformed into an interconnection of input-to-state practically stable (ISpS) subsystems characterized by ISpS-Lyapunov functions. Then, we take advantage of the gain-interconnections between the subsystems and construct a Lyapunov function for the closed-loop system. The proposed approach is validated through prescribed performance control for both SISO and MIMO plants, as well as systems not necessarily in the lower-triangular form and systems with dynamic uncertainty.},

keywords = {Input-to-state practical stability, Lyapunov function, Prescribed performance control},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {A Toolkit for Globally Robust Observer-Based Feedback with Relaxed Characterization of iISS/ISS},

author = {Hiroshi Ito and Hyungbo Shim},

url = {https://ieeexplore.ieee.org/abstract/document/9837417},

doi = {10.1109/TAC.2022.3193270},

issn = {0018-9286},

year  = {2023},

date = {2023-07-01},

urldate = {2022-07-22},

journal = {IEEE Transactions on Automatic Control},

volume = {68},

issue = {7},

pages = {3858-3871},

abstract = {This paper elaborates on flexibility in dealing with the interconnection of integral input-to-state stable (iISS) and input-to-state stable (ISS) systems. The undecoupled characterizations introduced separately for iISS and ISS in the literature are linked to build a framework enabling global analysis without settling for local and semi-global properties. Feedback control design in the presence of measurement noise can benefit from the framework immediately if plants are nonlinear, irrespective of application areas. This paper proposes a toolkit for providing robustness guarantees in observer-based output feedback control subject to measurement noise. For a nonlinear plant, the couplings among the plant state, the estimation error, and the measurement noise arising in the closed-loop equations often hinder global analysis such as ISS with respect to the measurement noise. In the formalism of iISS, this paper demonstrates that the flexibility in dealing with the couplings allows one to establish the robustness globally. Moreover, it gives a condition under which the closed-loop system can possess ISS and strong iISS which are stronger than iISS.},

keywords = {Integral input-to-state stability, Lyapunov function, Output feedback, Small gain theorem},

pubstate = {published},

tppubtype = {article}

}