P. Khargonekar - Academia.edu (original) (raw)

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Papers by P. Khargonekar

Research paper thumbnail of SUPPORT VECTOR MACHINE ALGORITHMS FOR EARLY SEIZURE DETECTION IN AN ANIMAL MODEL OF TEMPORAL LOBE EPILEPSY

Research paper thumbnail of Electricity Market Strategies for Wind Energy Producers with Co-located Storage

Research paper thumbnail of Smart Grid Integrity Attacks: Characterizations and Countermeasures

Research paper thumbnail of Comments on "Stability of a Class of 2-D Recursive Filters without Distortion of the Amplitude Spectrum

IEEE Transactions on Circuits and Systems, 1986

ABSTRACT Not Available

Research paper thumbnail of Linear fractional transformations and spectral factorization

IEEE Transactions on Automatic Control, 1986

ABSTRACT A spectral factorization algorithm based on linear fractional transformations is presented.

Research paper thumbnail of On the robust stability of linear time-invariant plants with unstructured uncertainty

IEEE Transactions on Automatic Control, 1987

ABSTRACT We consider general families of linear time-invariant plants described by a nominal plan... more ABSTRACT We consider general families of linear time-invariant plants described by a nominal plant model with unstructured uncertainty. We show, under a rather weak assumption, that when a family of systems is not robustly stabilizable by any linear time-invariant feedback controller, then no nonlinear time-varying controller can robustly stabilize the given family.

Research paper thumbnail of On the control of linear systems whose coefficients are functions of parameters

IEEE Transactions on Automatic Control, 1984

ABSTRACT The stabilization and regulation of linear discrete-time systems whose coefficients depe... more ABSTRACT The stabilization and regulation of linear discrete-time systems whose coefficients depend on one or more parameters is studied. For linear systems whose coefficients are continuous functions of real or complex parameters (respectively, analytic or rational functions of real parameters), it is shown that reachability of the system for all values of the parameters implies that the system can be stabilized using gains that are also continuous (analytic, rational) functions of the parameters. Closed-form expressions for a collection of stabilizing gains are given in terms of the reachability Gramian. For systems which are stabilizable for all values of the parameters, it is shown that continuous (analytic, rational) stabilizing gains can be computed from a finite-time solution to a Riccati difference equation whose coefficients are functions of the parameters. These results are then applied to the problem of tracking and disturbance rejection in the case when both the plant and the exogenous signals contain parameters.

Research paper thumbnail of Stabilization of time-delay systems using finite-dimensional compensators

IEEE Transactions on Automatic Control, 2000

For linear time-invariant systems with one or more noncommensnrate time delays, necessary and suf... more For linear time-invariant systems with one or more noncommensnrate time delays, necessary and sufficient conditions are given for the existence of, a fiite-dimensional stabilizing feedback compensator. In particular, it is shown that a stabilizable time-delay system can always be stabilized using a finite-dimensional compensator. The problem of explicitly constructing finite-dimensional stabilizing compensators is also considered.

Research paper thumbnail of Control of semiconductor manufacturing equipment: real-time feedback control of a reactive ion etcher

IEEE Transactions on Semiconductor Manufacturing, 1995

This paper describes the development of real-time control technology for the improvement of manuf... more This paper describes the development of real-time control technology for the improvement of manufacturing characteristics of reactive ion etchers. A general control strategy is presented. The principal ideas are to sense key plasma parameters, develop a dynamic input-output model for the subsystem connecting the equipment inputs to the key plasma variables, and design and implement a multivariable control system to control these variables. Experimental results show that this approach to closed-loop control leads to a much more stable etch rate in the presence of a variety of disturbances as compared to current industrial practice.

Research paper thumbnail of SUPPORT VECTOR MACHINE ALGORITHMS FOR EARLY SEIZURE DETECTION IN AN ANIMAL MODEL OF TEMPORAL LOBE EPILEPSY

Research paper thumbnail of Electricity Market Strategies for Wind Energy Producers with Co-located Storage

Research paper thumbnail of Smart Grid Integrity Attacks: Characterizations and Countermeasures

Research paper thumbnail of Comments on "Stability of a Class of 2-D Recursive Filters without Distortion of the Amplitude Spectrum

IEEE Transactions on Circuits and Systems, 1986

ABSTRACT Not Available

Research paper thumbnail of Linear fractional transformations and spectral factorization

IEEE Transactions on Automatic Control, 1986

ABSTRACT A spectral factorization algorithm based on linear fractional transformations is presented.

Research paper thumbnail of On the robust stability of linear time-invariant plants with unstructured uncertainty

IEEE Transactions on Automatic Control, 1987

ABSTRACT We consider general families of linear time-invariant plants described by a nominal plan... more ABSTRACT We consider general families of linear time-invariant plants described by a nominal plant model with unstructured uncertainty. We show, under a rather weak assumption, that when a family of systems is not robustly stabilizable by any linear time-invariant feedback controller, then no nonlinear time-varying controller can robustly stabilize the given family.

Research paper thumbnail of On the control of linear systems whose coefficients are functions of parameters

IEEE Transactions on Automatic Control, 1984

ABSTRACT The stabilization and regulation of linear discrete-time systems whose coefficients depe... more ABSTRACT The stabilization and regulation of linear discrete-time systems whose coefficients depend on one or more parameters is studied. For linear systems whose coefficients are continuous functions of real or complex parameters (respectively, analytic or rational functions of real parameters), it is shown that reachability of the system for all values of the parameters implies that the system can be stabilized using gains that are also continuous (analytic, rational) functions of the parameters. Closed-form expressions for a collection of stabilizing gains are given in terms of the reachability Gramian. For systems which are stabilizable for all values of the parameters, it is shown that continuous (analytic, rational) stabilizing gains can be computed from a finite-time solution to a Riccati difference equation whose coefficients are functions of the parameters. These results are then applied to the problem of tracking and disturbance rejection in the case when both the plant and the exogenous signals contain parameters.

Research paper thumbnail of Stabilization of time-delay systems using finite-dimensional compensators

IEEE Transactions on Automatic Control, 2000

For linear time-invariant systems with one or more noncommensnrate time delays, necessary and suf... more For linear time-invariant systems with one or more noncommensnrate time delays, necessary and sufficient conditions are given for the existence of, a fiite-dimensional stabilizing feedback compensator. In particular, it is shown that a stabilizable time-delay system can always be stabilized using a finite-dimensional compensator. The problem of explicitly constructing finite-dimensional stabilizing compensators is also considered.

Research paper thumbnail of Control of semiconductor manufacturing equipment: real-time feedback control of a reactive ion etcher

IEEE Transactions on Semiconductor Manufacturing, 1995

This paper describes the development of real-time control technology for the improvement of manuf... more This paper describes the development of real-time control technology for the improvement of manufacturing characteristics of reactive ion etchers. A general control strategy is presented. The principal ideas are to sense key plasma parameters, develop a dynamic input-output model for the subsystem connecting the equipment inputs to the key plasma variables, and design and implement a multivariable control system to control these variables. Experimental results show that this approach to closed-loop control leads to a much more stable etch rate in the presence of a variety of disturbances as compared to current industrial practice.

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