Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TAC.2025.3526671

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Publishing type：Research paper (scientific journal)  

This paper addresses the question whether model knowledge can guide a
defender to appropriate decisions, or not, when an attacker intrudes into
control systems. The model-based defense scheme considered in this study,
namely Bayesian defense mechanism, chooses reasonable reactions through
observation of the system's behavior using models of the system's stochastic
dynamics, the vulnerability to be exploited, and the attacker's objective. On
the other hand, rational attackers take deceptive strategies for misleading the
defender into making inappropriate decisions. In this paper, their dynamic
decision making is formulated as a stochastic signaling game. It is shown that
the belief of the true scenario has a limit in a stochastic sense at an
equilibrium based on martingale analysis. This fact implies that there are only
two possible cases: the defender asymptotically detects the attack with a firm
belief, or the attacker takes actions such that the system's behavior becomes
nominal after a finite time step. Consequently, if different scenarios result
in different stochastic behaviors, the Bayesian defense mechanism guarantees
the system to be secure in an asymptotic manner provided that effective
countermeasures are implemented. As an application of the finding, a defensive
deception utilizing asymmetric recognition of vulnerabilities exploited by the
attacker is analyzed. It is shown that the attacker possibly stops the attack
even if the defender is unaware of the exploited vulnerabilities as long as the
defender's unawareness is concealed by the defensive deception.

DOI： 10.1109/TAC.2023.3340978

arXiv

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Other Link： http://arxiv.org/pdf/2201.02351v2

Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.ifacsc.2024.100245

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/rnc.6720

Web of Science

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.ifacol.2023.10.738

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/ACCESS.2023.3274530

Web of Science

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Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/access.2023.3274530

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Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TAC.2021.3082513

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/LCSYS.2021.3087097

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/2103.03287v2

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TAC.2020.3035631

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/1902.01625v3

Language：Japanese  

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This study investigates general model-based incident handler's asymptotic
behaviors in time against cyber attacks to control systems. The attacker's and
the defender's dynamic decision making is modeled as an equilibrium of a
dynamic signaling game. It is shown that the defender's belief on existence of
an attacker converges over time for any attacker's strategy provided that the
stochastic dynamics of the control system is known to the defender. This fact
implies that the rational behavior of the attacker converges to a harmless
action as long as the defender possesses an effective counteraction. The
obtained result supports the powerful protection capability achieved by
model-based defense mechanisms.

arXiv

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Other Link： http://arxiv.org/pdf/2103.13121v1

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/TCST.2021.3118213

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/2009.11205v2

In order to protect smart distribution grids from intrusions, it is important
to understand possible risks and impacts of attacks. We study the worst-case
attack strategy of a power injection attack against the physical layer of a
smart distribution grid with a high penetration of photovoltaic resources. We
derive both the worst attack signal and worst attack location: The worst attack
signal is a step function which switches its sign at the final stage, and the
worst attack location is the node with the largest impedance to the grid
substation. Numerical examples on a European benchmark model verify the
developed results. Finally, both theoretical and numerical results are used to
discuss feasible defense strategies against power injection attacks.

arXiv

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Other Link： http://arxiv.org/pdf/2011.05829v2

This paper proposes a distributed design method of controllers having a
glocal (global/local) information structure for large-scale network systems.
Distributed design, independent design of all subcontrollers that constitute a
structured controller, facilitates scalable controller synthesis. While
existing distributed design methods confine attention to the decentralized or
distributed information structures, this study addresses distributed design of
glocal-structured controllers. Glocal control exploits the nature that network
system's behavior can typically be represented as a superposition of spatially
local fluctuations and global interarea oscillations by incorporating a global
coordinating subcontroller with local decentralized subcontrollers. The key
idea to distributed design of glocal controllers is to represent the original
network system as a hierarchical cascaded system composed of reduced-order
models representing the global and local dynamics, referred to as hierarchical
model decomposition. Distributed design is achieved by independently designing
and implementing subcontrollers for the reduced-order models while preserving
the cascade structure. This paper provides a condition for existence of the
hierarchical model decomposition, a specific representation of the hierarchical
system, a clustering method appropriate for the proposed approach, and a robust
extension. Numerical examples of a power grid evidence the practical relevance
of the proposed method.

arXiv

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Other Link： http://arxiv.org/pdf/2011.04576v1

Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/2003.11576v1

Publishing type：Research paper (scientific journal)  

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Other Link： https://dblp.uni-trier.de/db/journals/corr/corr2008.html#abs-2008-11552

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1016/j.ifacol.2020.12.1710

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/1911.05084v2

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

DOI： 10.9746/jcmsi.12.182

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.conengprac.2018.11.004

Web of Science

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Language：English  

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Publishing type：Research paper (scientific journal)  

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Other Link： https://dblp.uni-trier.de/db/journals/corr/corr1911.html#abs-1911-04915

Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.automatica.2019.06.010

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/1810.01141v1

Language：Japanese   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/TAC.2021.3082513

Web of Science

CiNii Books

arXiv

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1016/j.ifacol.2018.12.097

Web of Science

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Language：Japanese   Publisher：The Japan Joint Automatic Control Conference  

DOI： 10.11511/jacc.61.0_1313

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Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1016/j.ifacol.2017.08.1078

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

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Language：Japanese   Publisher：The Society of Instrument and Control Engineers  

In this paper, we develop a distributed design method for local controllers that perform transient stabilization of dynamic responses for deflections caused by contingencies in a large power gird. We suppose that multiple independent system operators exist and manage their corresponding generators in the power system. It is assumed that the system model associated with individual system operators should be unavailable for deciding their control policies and we formulate the local controller design problem where each controller is designed using its corresponding local system model and they achieve a desired transient response performance. Our proposed method based on hierarchical state-space expansion enables us to solve the distributed design problem and the resultant closed-loop system satisfies the requirements. Through numerical simulations for the IEEJ EAST 30-machine power system, the effectiveness of our proposed method is verified.

DOI： 10.9746/sicetr.53.608

CiNii Books

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/EUSIPCO.2016.7760475

Web of Science

Scopus

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Other Link： https://dblp.uni-trier.de/db/conf/eusipco/eusipco2016.html#HayakawaHSN16

Language：Japanese  

CiNii Books

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Language：Japanese  

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICC.2016.7511060

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/TSP.2017.2740164

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/1510.07273v1

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/LSP.2016.2625839

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/1508.06021v1

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

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Language：Japanese  

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Language：Japanese  

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Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/1503.07692v1

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

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Language：English  

Web of Science

arXiv

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Other Link： http://arxiv.org/pdf/1407.7083v1

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In this article, we consider the problem of coupling waves in a single-frequency full-duplex relay station. Conventional design methods give a digital filter or an adaptive array antenna that cancels the effect of coupling waves on the sampling instants. However, they ignore intersample oscillations that may be gained in the positive feedback loop, and thus degrade the performance. To solve this problem, we propose sampled-data H^∞ design of digital filters that cancel the continuous-time effect of coupling waves. Simulation results are shown to illustrate the effectiveness of the proposed method.

CiNii Books

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Language：Japanese  

In this article, we propose H∞ optimal design of digital filters that cancel the continuous-time effect of coupling waves in a single frequency full-duplex relay station from the transmitter to the receiving antenna. In this study, we model a relay station as a continuoustime system while conventional researches treat it as a discrete-time system. For this model, we design digital filters via the theory of sampled-data H∞ control for cancellation of coupling waves. Numerical experiments show the effectiveness of the proposed method.

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Other Link： http://hdl.handle.net/2433/189115