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Control systems of critical infrastructures are not able to avoid dealing with some security incidents caused by cyberattacks, such as malware infection and information. It is insufficient to apply existing information security countermeasures to control systems and then we need security concept specific to control systems because there exists gaps between information and control system security policies...
This paper aims to propose a fallback system isolated from man-in-the-middle attack (MITM) for networked control systems. In this paper, fallback is an incident response of the control system in which facilities are preferentially protected and a minimal system operates during MITM. Since the communication contents of the networked control systems can be tampered with by MITM, the proposed system...
This paper proposes a new scheduling method of dispatching and conflict-free routing for overhead hoist transport (OHT) systems in semiconductor fabrication (Fab). This paper utilizes a model predictive control (MPC) strategy in which the cycle of measurement, prediction, optimization and control is repeated. The first aim of the MPC application is to set a small prediction horizon for the scheduling...
This paper considers output feedback control for continuous-time discrete-valued input systems. Our controller achieves model following control for networked control systems and embedded devices with low-resolution AD/DA converters. The synthesis problem we address is simultaneous synthesis of a nominal controller and a delta-sigma modulator (the modulator is called a dynamic quantizer). Our approach...
For the networked control systems, the quantized control problem is one of the challenging problems since the continuous-valued signals are compressed and quantized to the discrete-valued signals via the communication channel and such the quantization often degrades the control performance. In terms of the broadbandization and the robustness of the networked control systems, this paper considers the...
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