List of English Publication

@article{nokey,

title = {Stability of linear systems with slow and fast time variation and switching: General case},

author = {Hyungbo Shim and Daniel Liberzon},

doi = {10.1016/j.nahs.2025.101626},

issn = {1751-570X},

year  = {2025},

date = {2025-11-01},

urldate = {2025-11-01},

journal = {Nonlinear Analysis: Hybrid Systems},

volume = {58},

pages = {101626},

abstract = {This paper studies exponential stability of linear systems with slow and fast time variation and switching. We use averaging to eliminate the fast dynamics and only retain the slow dynamics. We then use a recent stability criterion for slowly time-varying and switched systems, combined with perturbation analysis, to prove stability of the original system. The analysis involves working with an impulsive system in new coordinates, which enables us to treat a more general class of systems compared to previous work.},

keywords = {Averaging Theory, Nonlinear system, Switched systems},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Complexity Reduction for Resilient State Estimation of Uniformly Observable Nonlinear Systems},

author = {Junsoo Kim and Jin Gyu Lee and Henrik Sandberg and Karl H. Johansson},

doi = {10.1109/TAC.2024.3459413},

issn = {0018-9286},

year  = {2025},

date = {2025-02-01},

urldate = {2025-02-01},

journal = {IEEE TRANSACTIONS ON AUTOMATIC CONTROL},

volume = {70},

issue = {2},

pages = {1267-1272},

abstract = {A resilient state estimation scheme for uniformly observable nonlinear systems, based on a method for local identification of sensor attacks, is presented. The estimation problem is combinatorial in nature, and so many methods require substantial computational and storage resources as the number of sensors increases. To reduce the complexity, the proposed method performs the attack identification with local subsets of the measurements, not with the set of all measurements. A condition for nonlinear attack identification is introduced as a relaxed version of existing redundant observability condition. It is shown that an attack identification can be performed even when the entire state cannot be recovered from the measurements. As a result, although a portion of measurements are compromised, they can be locally identified and excluded from the state estimation, and thus, the true state can be recovered. Simulation results demonstrate the effectiveness of the proposed scheme.},

keywords = {Estimation theory, Nonlinear system, Observability},

pubstate = {published},

tppubtype = {article}

}

@article{SonShimSeo04,

title = {A dynamic output feedback control law for elastic joint robots via feedback-passivity approach},

author = {Young Ik Son and Hyungbo Shim and Jin Heon Seo},

doi = {10.1016/j.jfranklin.2004.05.001},

issn = {0016-0032},

year  = {2004},

date = {2004-09-01},

journal = {Journal of the Franklin Institute},

volume = {341},

number = {6},

pages = {477-490},

abstract = {Motivated by recent dynamic output feedback passivation results, a new set-point control law is presented for an elastic joint robot when the velocity measurements are not available. The proposed methodology designs an additional dynamics with which the parallel-connected system is feedback passive. That is, the composite nonlinear robot system has relative degree one with a new output and its zero-dynamics subsystem becomes the virtual closed-loop system with a simple proportional-derivative (PD) control law. This approach provides an alternative way of replacing the role of the velocity measurements for the PD law. With the proposed control law, the transfer function of the additional system has the form of sG(s) with a strictly positive real (SPR) G(s). Robustness analysis is also given with regard to uncertainties on the robot parameters. The performance of the proposed control law is illustrated in the simulation studies of a manipulator with three revolute elastic joints.},

keywords = {Nonlinear system},

pubstate = {published},

tppubtype = {article}

}