An LMI-based design framework for multirate steady-state Kalman filters using cyclic reformulation. Addresses the semidefinite measurement noise covariance in systems with sensors at different sampling rates (e.g., GPS at 1 Hz + wheel spee…

Estimation of robust invariant set for discrete-time switched linear systems with peak-bounded disturbances. A novel method combining recursive state updating and robust invariant ellipsoid achieves less conservative estimation.

Observer-based feedback controller design for multi-rate systems where sensors and actuators operate at different sampling rates. Using cyclic reformulation and LMI optimization of the l2-induced norm, both observer gains and feedback gain…

System identification algorithm for multirate sensing environments using cyclic reformulation and subspace identification. Proposes a method to identify plant models from input-output data when sensors have different sampling rates, withou…

This article explains cyclic reformulation-based system identification for LPTV systems. A subspace identification method with state coordinate transformation recovers periodic time-varying parameters without requiring periodic inputs. Bas…

This article explains the tracking performance limitation for 1-DOF control systems with unstable plants, extending the achievable-output-set approach from 2-DOF systems. The closed-form result separates the contributions of unstable zeros…

This article explains the MEC design with parallel feedforward compensator for MIMO non-minimum phase systems with polytopic uncertainties, based on SICE JCMSI 2022. LMI-based H-infinity analysis for both continuous- and discrete-time syst…

This article explains a design method for the Model Error Compensator (MEC) for systems with polytopic-type uncertainty and disturbances, based on SICE JCMSI 2021. LMI-based H-infinity analysis combined with particle swarm optimization ena…

This article explains the Model Error Compensator (MEC) with a parallel feed-forward filter (PFF) for non-minimum-phase plants with unstable zeros and time delays, based on SICE JCMSI 2017. Design methods for PFF and compensator using PSO …

This article explains a compensator design method that minimizes the modeling gap between a nominal model and the actual plant, proposed in SICE JCMSI 2013. The compensator includes the nominal model internally and feeds back the output di…

This article explains the dynamic quantizer design method for networked control systems under communication rate constraints, published in IEEE Transactions on Automatic Control (2016). The method combines invariant set analysis and partic…

This article explains a design method for delta-sigma data conversion systems with a pre-filter that separately handles quantization noise and signal distortion. The pre-filter and post-filter are designed using particle swarm optimization…

Analyzes performance limitations in tracking control for non-minimum phase systems. It derives fundamental bounds on achievable tracking accuracy and explains how unstable zeros impose unavoidable constraints on transient and steady-state …

This article explains the MCV (Median of Candidate Vectors) observer, a state estimation method robust to sensor outliers. Multiple estimation candidates are created along the time axis, and the median operation selects one unaffected by o…

This article explains the design of a periodically time-varying state observer for multi-rate sensing systems, based on our IEEE ACCESS 2023 paper. LMI-based synthesis via periodic Lyapunov matrices is detailed with numerical examples and …