- The L
_{∞}/L_{2}Hankel Operator/Norm of Sampled-Data Systems (as listed below) - On Well-Definability of the L
_{∞}/L_{2}Hankel Operator and Detection of All the Critical Instants in Sampled-Data Systems (as listed below) - External Positivity of Sampled-Data Systems and Their L
_{q}/L_{∞}Hankel Norm Analysis - Quasi L
_{2}/L_{2}Hankel Norms and L_{2}/L_{2}Hankel Norm/Operator of Sampled-Data Systems - L
_{2}/L_{1}Induced Norm and Hankel Norm Analysis in Sampled-Data Systems

- Extensive Theoretical/Numerical Comparative Studies on H
_{2}and Generalised H_{2}Norms in Sampled-Data Systems - Upper/Lower Bounds of Generalized H
_{2}Norms in Sampled-Data Systems with Convergence Rate Analysis and Discretization Viewpoint - The L
_{∞}/L_{2}Hankel Operator/Norm of Sampled-Data Systems - On Well-Definability of the L
_{∞}/L_{2}Hankel Operator and Detection of All the Critical Instants in Sampled-Data Systems - The Generalized H
_{2}Controller Synthesis Problem of Sampled-Data Systems

- Quasi-Finite-Rank Approximation of Compression Operators on L
_{∞}[0,h) with Application to Stability Analysis of Time-Delay Systems (as listed below) - Computing the L
_{∞}[0,h)-Induced Norm of a Compression Operator via Fast-lifting - L
_{∞}-Induced Norm Analysis of Sampled-Data Systems via Piecewise Constant and Linear Approximations - Computing the L
_{∞}-Induced Norm of LTI Systems via Kernel Approximation and Its Comparison with Input Approximation - L
_{1}Discretization for Sampled-Data Controller Synthesis via Piecewise Linear Approximation - Further Results on the L
_{1}Analysis of Sampled-Data Systems via Kernel Approximation Approach - Computing the L
_{∞}-Induced Norm of LTI Systems: Generalization of Piecewise Quadratic and Cubic Approximations - L
_{1}Optimal Controller Synthesis for Sampled-Data Systems via Piecewise Linear Kernel Approximation - Generalized Framework for Computing the L
_{∞}-Induced Norm of Sampled-Data Systems

- Two-Degree-of-Freedom LQI Servo Systems; State-Predictive Control for Systems with Pure Delay (as listed below)
- Quasi-Finite-Rank Approximation of Compression Operators in Sampled-Data Systems and Time-Delay Systems (as listed below)
- Fast-Lifting Approach to the Computation of the Spectrum of Retarded Time-Delay Systems
- Concatenated Solutions of Delay-Differential Equations and Their Representation with Time-Delay Feedback Systems
- Conversion of Linear Time-Invariant Delay-Differential Equations with External Input and Output into Representation as Time-Delay Feedback Systems
- Numerical Methods for Spectrum Computation of Monodromy Operators via Non-Causal Hold Discretization
- Conversion of Linear Time-Invariant Time-Delay Feedback Systems into Delay-Differential Equations with Commensurate Delays
- Quasi-Finite-Rank Approximation of Compression Operators on L
_{∞}[0,h) with Application to Stability Analysis of Time-Delay Systems (as opposed to a relevant study on L_{2}[0,h)) - Spectrum of Monodromy Operator for a Time-Delay System with Application to Stability Analysis
- Modified State Predictive Control Aimi ng at Improving Robust Stability

- Note on Well-Posedness and Separator-Type Robust Stability Theorem of LTI Systems
- Unified Treatment of Robust Stability Conditions for Discrete-Time Systems through an Infinite Matrix Framework
- Robust Stability Analysis Based on FIR Scaling for Discrete-Time Linear Time-Invariant Systems

- Noncausal Linear Periodically Time-Varying Scaling for Robust Stability Analysis of Discrete-Time Systems: Frequency-Dependent Scaling Induced by Static Separators
- Robust Stabilizing Controller Synthesis Based on Discrete-Time Noncausal Linear Periodically Time-Varying Scaling (in Japanese)
- Properties of Discrete-Time Noncausal Linear Periodically Time-Varying Scaling and Their Relationship with Shift-Invariance in Lifting-Timing
- Robust Performance Controller Synthesis Based on Discrete-Time Noncausal Linear Periodically Time-Varying Scaling
- Demonstrating the Effectiveness of Robust Performance Synthesis Based on Noncausal Linear Periodically Time-Varying Scaling through Control Experiments of Cart Inverted Pendulum (in Japanese)
- Robust Stability Analysis with Cycling-Based LPTV Scaling: Part I. Fundamental Results on Its Relationship with Lifting-Based LPTV Scaling
- Robust Stability Analysis with Cycling-Based LPTV Scaling: Part II. Its Properties under the Use of FIR Separators

- Linear Periodically Time-Varying Scaling and Its Properties
- Modified Fast-Sample/Fast-Hold Approximation for Sampled-Data System Analysis
- Separator-Type Robust Stability Theorem of Sampled-Data Systems Allowing Noncausal LPTV Scaling
- Modified Fast-Sample/Fast-Hold Approximation and γ-Independent H
_{∞}-Discretization for General Sampled-Data Systems by Fast-Lifting - Stability Analysis of Sampled-Data Systems with Static Sector Nonlinearities via Causal Linear Periodically Time-Varying Scaling
- Quasi-Finite-Rank Approximation of Compression Operators in Sampled-Data Systems and Time-Delay Systems (on L
_{2}[0,h) as opposed to L_{∞}[0,h)) - Block Checker/Diagonal Transformation Matrices, Their Properties, and the Interplay with Fast-Lifting
- Fast-Lifting Approach to the Computation of the Spectrum of Retarded Time-Delay Systems (as listed above)

- Computation of the Frequency Response Gains and $ H_\infty $-Norm of a Sampled-Data System
- FR-Operator Approach to the $ H_2 $ Analysis and Synthesis of Sampled-Data Systems
- Frequency Response of Sampled-Data Systems
- Absolute Stability of Sampled-Data Systems with a Sector Nonlinearity
- Popov-Type Criterion for Stability of Nonlinear Sampled-Data Systems
- Robust Stability of Sampled-Data Systems under Possibly Unstable Additive/Multiplicative Perturbations
- Generalization of Stability Criteria for Nonlinear Sampled-Data Systems (in Japanese)
- Bisection Algorithm for Computing the Frequency Response Gain of Sampled-Data Systems---Infinite-Dimensional Congruent Transformation Approach

[PDF file purchased from IEEE Reprints; for corrigenda to printer's errors after the proofreading process, see IEEE Trans. Automat. Contr., Vol. 47, No. 1, p. 201, 2002.] - Upper and Lower Bounds of the Frequency Response Gain of Sampled-Data Systems
- Nyquist Stability Criterion and Positive-Realness of Sampled-Data Systems
- Spectral Analysis and Singular Value Computations of the Noncompact Frequency Response and Compression Operators in Sampled-Data Systems

[PDF file; accessible only from within our university to conform to the copyright assignment agreement with SIAM]

[corrigenda] - Positive-Realness Analysis of Sampled-Data Systems and Its Applications

[corrigenda] - A Study on the Spectrum of the Sampled-Data Transfer Operator with Applications to Robust Exponential Stability Problems

[PDF file; accessible only from within our university to conform to the copyright assignment agreement with SIAM] - On Sensitivity Reduction Problems of Sampled-Data Systems: Relationships to the Problems of Discrete-Time Systems

- Preservation of Reachability and Observability under Sampling with a First-Order Hold
- Analytic Study on the Intrinsic Zeros of Sampled-Data Systems
- Note on Reachability Indices of Augmented Systems
- Simultaneous Pole Assignment by Multi-Structured Multirate Sampled-Data Controllers
- Improved Results for Simultaneous Pole Assignment by Multirate Sampled-Data Controllers
- Sequential Tuning Methods of LQ/LQI Controllers for Multivariable Systems and Their Application to Hot Strip Mills
- Time-Sharing Multirate Sample-Hold Controllers and Their Application to Reliable Stabilization
- Robust Performance Analysis of Sampled-Data Systems against Parameter Uncertainties
- Wronskian Approach to Observability and the Unobservable Subspace through the Null-Space Analysis (in Japanese)
- Internal/External Positivity of Sampled-Data Systems: Definitions and the Necessary and Sufficient Conditions

- Frequency Response Gain Computation of Finite-Dimensional Linear Continuous-Time Systems
- Stability Analysis and Harmonic Lyapunov Equations of Continuous-Time Periodic Systems
- Existence Conditions and Properties of the Frequency Response Operators of Continuous-Time Periodic Systems

[PDF file; accessible only from within our university to conform to the copyright assignment agreement with SIAM] - Norm Computations by the Skew Analysis of the Frequency Response Operators of Continuous-Time Periodic Systems
- Truncating the Harmonic Lyapunov Equation for the $ H2 $-Norm Computation of Linear Continuous-Time Periodic Systems
- 2-Regularized Nyquist Criterion in Linear Continuous-Time Periodic Systems and Its Implementation

[PDF file; accessible only from within our university to conform to the copyright assignment agreement with SIAM] - Some Remarks on Realization of Periodic Systems
- Linear Periodically Time-Varying Scaling and Its Properties(as listed above)
- Noncausal Linear Periodically Time-Varying Scaling for Robust Stability Analysis of Discrete-Time Systems: Frequency-Dependent Scaling Induced by Static Separators(as listed above)

- Two-Degree-of-Freedom LQI Servo Systems; State Feedback Case
- Two-Degree-of-Freedom LQI Servo Systems; Analysis of the Performance Deterioration by the Introduction of an Observer
- Two-Degree-of-Freedom LQI Servo Systems; Use of Frequency-Dependent Weighting Matrices for Sensitivity Reduction
- Two-Degree-of-Freedom LQI Servo Systems; Optimal Observer for Disturbance Rejection
- Two-Degree-of-Freedom LQI Servo Systems; Application to the Positioning Control of a Pneumatic Servo Cylinder (in Japanese)
- Two-Degree-of-Freedom LQI Servo Systems; State-Predictive Control for Systems with Pure Delay
- Trajectory Tracking Control of a Two-Axis Arm Driven by Pneumatic Artificial Muscles (in Japanese)

- Absolute Stability of Sampled-Data Systems with a Sector Nonlinearity (as listed above)
- Popov-Type Criterion for Stability of Nonlinear Sampled-Data Systems (as listed above)
- Stability Condition of a Class of Nonlinear Feedback Systems: Reduction to a Convex Problem
- Generalization of Stability Criteria for Nonlinear Sampled-Data Systems (as listed above)
- LMI Representation of a Stability Condition for a Class of Nonlinear Feedback Systems
- A Study on Stability of Optimal Regulators under Online Gain Adjustment
- Stability Analysis of Sampled-Data Systems with Static Sector Nonlinearities via Causal Linear Periodically Time-Varying Scaling (as listed above)
- Causality of General Input-Output Systems and Extended Small-Gain Theorem for Their Feedback Connection

- Two-Degree-of-Freedom LQI Servo Systems; Application to the Positioning Control of a Pneumatic Servo Cylinder (as listed above)
- Trajectory Tracking Control of a Two-Axis Arm Driven by Pneumatic Artificial Muscles (as listed above)
- Demonstrating the Effectiveness of Robust Performance Synthesis Based on Noncausal Linear Periodically Time-Varying Scaling through Control Experiments of Cart Inverted Pendulum (as listed above)
- Nonlinear Control with Integral Compensation for Output Voltage of Boost Converters Based on Discretized Bilinear Model I---Modeling and Identification (in Japanese)
- Nonlinear Control with Integral Compensation for Output Voltage of Boost Converters Based on Discretized Bilinear Model II---Derivation of a Control Law and Verification by Experiments (in Japanese)
- Nonlinear Output Feedback Control for Average Output Voltage of Boost Converters Based on Their Discretized Bilinear Model (in Japanese)
- Atmosphere Dynamics Modeling and Hydrogen Ratio Control of Horizontal Continuous Annealing Furnace (in Japanese)
- Nonlinear Control via the SOS Method for the Output Voltage of Buck Converters Based on Discretized Bilinear Models (in Japanese)

- Expository article on the Frequency-Domain Study of Sampled-Data Systems (in Japanese)
- Book review (IEEE Trans. Automat. Contr., Aug. 1997.) for "Optimal Sampled-Data Control Systems by Tongwen Chen and Bruce Francis"
- Expository article on the Recent Developments of Sampled-Data Control Theory (in Japanese)
- Expository article on Bisection Algorithms for the Frequency Response Gain Computation of Sampled-data Systems (in Japanese)
- Expository article on the Recent Studies on Input-Output Stability of Nonlinear Continuous/Sampled-Data Systems (in Japanese)
- Expository article; Brief Introduction to Digital and Sampled-Data Control Systems for Novices (in Japanese)
- Expository article; New Advances in Sampled-Data Control and Digital Control---with Primary Focus on Fast-Lifting and Noncausal Linear Periodically Time-Varying Scaling--- (in Japanese)
- Expository article; Representation Models of Time-Delay Systems and Their Initial Value Problems (in Japanese)
- Expository article; Robust Stability Analysis Based on Dynamic Scaling for Discrete-Time Systems (in Japanese)

last update January, 2024

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