List of English Publication

@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}

}

@article{Behera20b,

title = {Robust feedback stabilization using high-gain observer via event triggering},

author = {Abhisek K. Hehera and Hyungbo Shim},

doi = {https://doi.org/10.1002/rnc.4868},

issn = {1049-8923},

year  = {2020},

date = {2020-03-01},

journal = {International Journal of Robust and Nonlinear Control},

volume = {30},

number = {5},

pages = {2097-2112},

abstract = {In this article, the problem of robust output feedback stabilization of single-input single-output nonlinear systems is studied in the event-triggering framework. In this work, an event-triggered output feedback law based on a high-gain observer is constructed, which guarantees the stability of closed-loop system. First, the high-gain observer with a triggering scheme is designed to estimate the plant state in the presence of external disturbances subject to any satisfactory accuracy of the estimation error. The observer-based triggering mechanism decides the transmission of plant output to the observer by observing a certain event condition. Similarly, another triggering mechanism is designed using the estimated state of observer that triggers the control signal to be updated only when it is satisfied. Under this proposed event-triggering framework, the stability of closed-loop system is then analyzed. Here, we provide the simplified design technique, in which the high-gain parameter and the triggering thresholds can be selected independently to achieve any desired bound for the plant trajectory. The results are finally demonstrated through simulation of a numerical example.},

keywords = {Event-triggered control, Output feedback, Robust stabilization},

pubstate = {published},

tppubtype = {article}

}

@article{Behera20,

title = {Robust feedback stabilization using high-gain observer via event triggering},

author = {Abhisek K. Hehera/ Hyungbo Shim},

doi = {https://doi.org/10.1002/rnc.4868},

issn = {1049-8923},

journal = {International Journal of Robust and Nonlinear Control},

volume = {30},

number = {5},

pages = {2097-2112},

abstract = {In this article, the problem of robust output feedback stabilization of single-input single-output nonlinear systems is studied in the event-triggering framework. In this work, an event-triggered output feedback law based on a high-gain observer is constructed, which guarantees the stability of closed-loop system. First, the high-gain observer with a triggering scheme is designed to estimate the plant state in the presence of external disturbances subject to any satisfactory accuracy of the estimation error. The observer-based triggering mechanism decides the transmission of plant output to the observer by observing a certain event condition. Similarly, another triggering mechanism is designed using the estimated state of observer that triggers the control signal to be updated only when it is satisfied. Under this proposed event-triggering framework, the stability of closed-loop system is then analyzed. Here, we provide the simplified design technique, in which the high-gain parameter and the triggering thresholds can be selected independently to achieve any desired bound for the plant trajectory. The results are finally demonstrated through simulation of a numerical example.},

keywords = {Event-triggered control, Output feedback, Robust stabilization},

pubstate = {published},

tppubtype = {article}

}