List of English Publication

@article{TanwaniShimLiberzon13,

title = {Observability for Switched Linear Systems: Characterization and Observer Design},

author = {Aneel Tanwani and Hyungbo Shim and Daniel Liberzon},

doi = {10.1109/TAC.2012.2224257},

year  = {2013},

date = {2013-04-01},

journal = {IEEE Transactions on Automatic Control},

volume = {58},

number = {4},

pages = {891-904},

abstract = {This paper presents a characterization of observability and an observer design method for switched linear systems with state jumps. A necessary and sufficient condition is presented for observability, globally in time, when the system evolves under predetermined mode transitions. Because this characterization depends upon the switching signal under consideration, the existence of singular switching signals is studied alongside developing a sufficient condition that guarantees uniform observability with respect to switching times. Furthermore, while taking state jumps into account, a relatively weaker characterization is given for determinability, the property that concerns with recovery of the original state at some time rather than at all times. Assuming determinability of the system, a hybrid observer is designed for the most general case to estimate the state of the system and it is shown that the estimation error decays exponentially. Since the individual modes of the switched system may not be observable, the proposed strategy for designing the observer is based upon a novel idea of accumulating the information from individual subsystems. Contrary to the usual approach, dwell-time between switchings is not necessary, but the proposed design does require persistent switching. For practical purposes, the calculations also take into account the time consumed in performing computations.},

keywords = {Linear system, Time-varying system},

pubstate = {published},

tppubtype = {article}

}

@article{SeoBacKimShim12,

title = {Output Feedback Consensus for High-order Linear Systems Having Uniform Ranks Under Switching Topology},

author = {Jin Heon Seo and Juhoon Back and Hongkeun Kim and Hyungbo Shim},

doi = {10.1049/iet-cta.2011.0197},

year  = {2012},

date = {2012-05-17},

journal = {IET Control Theory and Applications},

volume = {6},

number = {8},

pages = {1118-1124},

abstract = {This study addresses a challenging problem on the consensus of multi-agent systems, that is, simultaneously deals with the high-order linear multi-agent systems (including single and double integrators, and harmonic oscillators) and time-varying interaction topology. The interaction topology is assumed to switch among a finite number of connected undirected graphs having a non-vanishing dwell time. It is also constrained that each agent can use only the system outputs of its neighbouring agents for the purpose of feedback. Under these conditions, the authors propose two high-gain dynamic consensus protocols, one with multiple time-scale based and the other single time-scale, for the uniform rank systems without finite zeros. An example is provided to validate the proposed protocols.},

keywords = {Time-varying system},

pubstate = {published},

tppubtype = {article}

}