22 citations · 76 across the 26 of their papers we have counts for
30 papers
Anomaly Score Preserving Data Poisoning Attacks on Data-Driven Controller Design
Motoharu Tsuboi, Hampei Sasahara, Iori Takaki +1
This paper investigates stealthy data poisoning attacks against data-driven controller synthesis and develops an attack generation method. During data collection, an attacker can s…
Scalable Outer Approximation of Minkowski Sums of Matrix Ellipsoids for Data-Driven Control
Taira Kaminaga, Hampei Sasahara
Matrix ellipsoids provide a standard framework for representing bounded uncertainties in data-driven control. Since noise models for sequential observations are naturally represent…
Structural Monotonicity in Transmission Scheduling for Remote State Estimation with Hidden Channel Mode
Hampei Sasahara
This study treats transmission scheduling for remote state estimation over unreliable channels with a hidden mode. A local Kalman estimator selects scheduling actions, such as powe…
Resilient Distribution Network Planning against Dynamic Malicious Power Injection Attacks
Hampei Sasahara, Tatsuya Yamada, Jun-ichi Imura +1
Active distribution networks facilitating bidirectional power exchange with renewable energy resources are susceptible to cyberattacks due to integration of a diverse array of cybe…
Adversarial Destabilization Attacks to Direct Data-Driven Control
Hampei Sasahara
This study explores the vulnerability of direct data driven control, particularly in the linear quadratic regulator (LQR) problem, to adversarial perturbations in offline collected…
Data Informativity under Data Perturbation
Taira Kaminaga, Hampei Sasahara
Data informativity provides a theoretical foundation for determining whether collected data are sufficiently informative to achieve specific control objectives in data-driven contr…
Data Informativity for Quadratic Stabilization under Data Perturbation
Taira Kaminaga, Hampei Sasahara
Assessing data informativity, determining whether the measured data contains sufficient information for a specific control objective, is a fundamental challenge in data-driven cont…
Adversarial Attacks to Direct Data-driven Control for Destabilization
Hampei Sasahara
This study investigates the vulnerability of direct data-driven control to adversarial attacks in the form of a small but sophisticated perturbation added to the original data. The…
Attack Impact Evaluation for Stochastic Control Systems through Alarm Flag State Augmentation
Hampei Sasahara, Takashi Tanaka, Henrik Sandberg
This note addresses the problem of evaluating the impact of an attack on discrete-time nonlinear stochastic control systems. The problem is formulated as an optimal control problem…
Green Routing Game: Strategic Logistical Planning using Mixed Fleets of ICEVs and EVs
Hampei Sasahara, György Dán, Saurabh Amin +1
This paper introduces a "green" routing game between multiple logistic operators (players), each owning a mixed fleet of internal combustion engine vehicle (ICEV) and electric vehi…
Attack Impact Evaluation by Exact Convexification through State Space Augmentation
Hampei Sasahara, Takashi Tanaka, Henrik Sandberg
We address the attack impact evaluation problem for control system security. We formulate the problem as a Markov decision process with a temporally joint chance constraint that fo…
Asymptotic Security using Bayesian Defense Mechanism with Application to Cyber Deception
Hampei Sasahara, Henrik Sandberg
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 def…
Asymptotic Security by Model-based Incident Handlers for Markov Decision Processes
Hampei Sasahara, Henrik Sandberg
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 deci…
Epistemic Signaling Games for Cyber Deception with Asymmetric Recognition
Hampei Sasahara, Henrik Sandberg
This study provides a model of cyber deception with asymmetric recognition represented by private beliefs. Signaling games, which are often used in existing works, are built on the…
Distributed Design of Glocal Controllers via Hierarchical Model Decomposition
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura +2
This paper proposes a distributed design method of controllers having a glocal (global/local) information structure for large-scale network systems. Distributed design, independent…
Power Injection Attacks in Smart Distribution Grids with Photovoltaics
Martin Lindström, Hampei Sasahara, Xingkang He +2
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 powe…
Disconnection-aware Attack Detection and Isolation with Separation-based Detector Reconfiguration
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura +1
This study addresses incident handling during an adverse event for dynamical networked control systems. Incident handling can be divided into five steps: detection, analysis, conta…
Parameterization of All Output-Rectifying Retrofit Controllers
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura
This study investigates a parameterization of all output-rectifying retrofit controllers for distributed design of a structured controller. It has been discovered that all retrofit…
Asymptotic Security of Control Systems by Covert Reaction: Repeated Signaling Game with Undisclosed Belief
Hampei Sasahara, Serkan Saritas, Henrik Sandberg
This study investigates the relationship between resilience of control systems to attacks and the information available to malicious attackers. Specifically, it is shown that contr…
Disconnection-aware Attack Detection in Networked Control Systems
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura +1
This study deals with security issues in dynamical networked control systems. The goal is to establish a unified framework of the attack detection stage, which includes the four pr…
Parameterization of Retrofit Controllers
Hampei Sasahara, Takayuki Ishizaki, Jun-ichi Imura
This study investigates a parameterization of all retrofit controllers. Retrofit control can accomplish modular design of control systems, i.e., independent design of subcontroller…
Modularity-in-Design of Dynamical Network Systems: Retrofit Control Approach
Takayuki Ishizaki, Hampei Sasahara, Masaki Inoue +2
In this paper, we develop a modular design method of decentralized controllers for linear dynamical network systems, where multiple subcontroller designers aim at individually regu…
Retrofit Control with Approximate Environment Modeling
Takayuki Ishizaki, Takahiro Kawaguchi, Hampei Sasahara +1
In this paper, we develop a retrofit control method with approximate environment modeling. Retrofit control is a modular control approach for a general stable network system whose…
Multiuser Detection by MAP Estimation with Sum-of-Absolute-Values Relaxation
Hampei Sasahara, Kazunori Hayashi, Masaaki Nagahara
In this article, we consider multiuser detection that copes with multiple access interference caused in star-topology machine-to-machine (M2M) communications. We assume that the tr…