Stability of Signal Reconstruction Filters via Cardinal Exponential Splines (2009)
Masaaki Nagahara, Yutaka Yamamoto, Pramod P. Khargonekar
Abstract: There is a new trend in digital signal processing. It is gradually recognized that while the processing is done in the digital domain, its performance must be measured in the analog domain....
Reduction Of Loading Effect In Reactive Ion Etching Using Real-Time Closed Loop Control (2007)
Oliver Patterson And, Oliver D. Patterson, Pramod P. Khargonekar
Real-time, in-situ control of reactive ion etching is shown to reduce loading disturbance in an Applied 8300 reactive ion etch system. The etch process vehicle is CF 4 etching of polysilicon. A...
Oliver D. Patterson, Pramod P. Khargonekar, Dennis S. Grimard, Dennis S, X. Dong, V. N. Nair
A coordinated e#ort to satisfy the modelling requirements for robust design, real-time feedbackvariable selection and run-to-run control, for reactive ion etching of a self-aligned gate, is...
Oliver Patterson Dong, X. Dong, Pramod P. Khargonekar, V. N. Nair, Dennis S. Grimard
Inmanymanufacturing processes, the important process output characteristics cannot be measured in real-time and therefore cannot be directly controlled using real-time feedback control. However, the...
Identification in Frequency Domain (2007)
Guoxiang Gu, Pramod P. Khargonekar
In this paper, we describe some of our recent work on identification in frequency domain. 1 Introduction System modeling and identification plays a central and critical role in the design of control...
Euisu Park, Dawn M. Tilbury, Pramod P. Khargonekar
The logic control for high-volume machiningsysteE such asthe transfe line commonlyuse inthe automotive manufacturing industry, must achie e multiple functions in distinct control mode and thus...
Recess Etch Tyrone, Tyrone L. Vincent, Pete I. Klimecky, Weiqian Sun, Pramod P. Khargonekar, Fred L. Terry
We present experimental results validating a new technique that achieves accurate endpoint for a TFT backchannel recess etch. These results show a 90# reduction in the standard deviation of #nal...
Robert Murphey, Pramod P. Khargonekar, Pavlo Krokhmal, David E. Jeffcoat, Jerry Fudge, Derek Kingston, ...
Groff, Richard E, Khargonekar, Pramod P, Koditschek, Daniel E
The class of continuous piecewise linear (PL) functions represents a useful family of approximants because invertibility can be readily imposed, and if a PL function is invertible, then it can be...
Skew-Prime Polynomial Matrices: The Polynomial-Model Approach, (2002)
Khargonekar,Pramod P., Georgiou,Tryphon T., Ozguler,A. Bulent
Piecewise Linear Homeomorphisms: The Scalar Case (2000)
Groff, Richard E, Koditschek, Daniel E, Khargonekar, Pramod P
The class of piecewise linear homeomorphisms (PLH) provides a convenient functional representation for many applications wherein an approximation to data is required that is invertible in closed...
Representation of Color Space Transformations for Effective Calibration and Control (2000)
Groff, Richard E, Koditschek, Daniel E, Khargonekar, Pramod P, Thieret, Tracy E
We propose the "minvar" algorithm for computing continuous, continuously invertible, piecewise linear (PL) approximations of color space transformations that can serve as functional replacements...
A class of nonlinear filtering problems arising from drifting sensor gains (1999)
Tyrone L. Vincent, Pramod P. Khargonekar
Abstract — This paper considers a state estimation problem where the nominal system is linear but the sensor has a timevarying gain component, giving rise to a bilinear output equation. This is a...
Dhrubajyoti Kalita, Pramod P. Khargonekar
In this paper, we present a hierarchical structure and framework for the representation, analysis and design of controllers for a Reconfigurable Machining System (RMS). This hierarchical framework...
Khargonekar,Pramod P., Emre,Erol
Availability: Pub. in IEEE Transactions on Automatic Control, vAC-27 n2 p352-366 Apr 82.
Khargonekar,Pramod P., Sontag,Eduardo D.
Sponsored in part by Grant AFOSR-80-0196. Availability: Pub. in IEEE Transactions on Automatic Control, vAC-27 n3 p627-638 Jun 82.
Robust Adaptive Control: Stability and Asymptotic Performance. (1998)
Krause, James M., Khargonekar, Pramod P., Stein, Gunter
Systems containing both compact real parametric uncertainty and frequency-weighted bounded operator uncertainty are addressed. It is shown that any parameter adaptive control system is robustly...
Generalized Interpolation Theory for the Design and Analysis of Robust Feedback Systems. (1998)
Khargonekar, Pramod P., Tannenbaum, Allen R.
In this report, we give a brief summary of the work done by the PIs and their students on the design and analysis of robust feedback systems. Under this contract, we have conducted research on a...
The Design and Analysis of Robust Feedback Systems. (1998)
In this report, we give a brief summary of the work done by the PI and his students on the design and analysis of robust feedback systems. Under this contract, we have conducted research on a number...
Control and Identification of Uncertain Systems (1998)
This report briefly summarizes the work performed for the Army Research Office under grant number ARO-DAAH04-93-G-0012 on the design and analysis of robust feedback systems. This research is broadly...
Intelligent Electronics Manufacturing: Modeling and Control of Plasma Processing (1998)
The MURI Center on Modeling and Control of Plasma Processing at the University of Michigan started in September, 1995, and concluded technical work at the end of August 2001. As the name indicates,...
Invertible Piecewise Linear Approximations for Color Reproduction (1998)
Groff, Richard E, Koditschek, Daniel E, Khargonekar, Pramod P
We consider the use of linear splines with variable knots for the approximation of unknown functions from data, motivated by control and estimation problems arising in color systems management....
Toward a Control Oriented Model of Xerographic Marking Engines (1996)
Mestha, L. K, Wang, Y. R, Dianat, S., Jackson, E., Thieret, Tracy, Khargonekar, Pramod P, ...
This paper presents some preliminary results from a research collaboration concerning the modeling and control of color xerography. In this first communication of our work, we describe our efforts to...
Frequency response of sampled-data systems (1996)
Yutaka Yamamoto, Senior Member Ieee, Pramod P. Khargonekar
Abstract — This paper introduces the concept of frequency response for sampled-data systems, and explores some basic properties as well as its computational procedures. It is shown that i) by...
Optimal controller synthesis with stability, (1994)
Sivashankar, N., Kaminer, Isaac, Khargonekar, Pramod P.
In this paper, we consider the problem of finding controllers which place the eigenvalues of the closed-loop system matrix in a prespecified circular region in the left-half plane and minimize an...
Khargonekar, Pramod P., Shim, Duksun
It is shown that a maximally robust state-feedback controller for a plant with normalized right coprime factor uncertainty is given by the solution to a standard linear quadratic regulator problem.
The least squares algorithm, parametric system identification and bounded noise (1993)
Akcay, Huseyin, Khargonekar, Pramod P.
The least squares parametric system identification algorithm is analyzed assuming that the noise is a bounded signal. A bound on the worst-case parameter estimation error is derived. This bound shows...
Mixed control for discrete-time systems via convex optimization, (1993)
Kaminer, Isaac, Khargonekar, Pramod P., Rotea, Mario A.
A mixed control problem for discrete-time systems is considered, where an upper bound on the norm of a closed loop transfer matrix is minimized subject to an constraint on another closed loop...
Induced norms for sampled-data systems (1992)
Sivashankar, N., Khargonekar, Pramod P.
In this paper, we consider a general linear interconnection of a continuous-time plant and a discrete-time controller via sample and hold devices. When the closed loop sampled-data feedback system is...
Robust convergence of two-stage nonlinear algorithms for identification in [infinity] (1992)
Gu, Guoxiang, Khargonekar, Pramod P., Li, Yanlin
Two-stage nonlinear algorithms for the problem of identification in [infinity] are analyzed in terms of the Fourier transform of the window function. Conditions characterizing the robust convergence...
Krause, James M., Stein, Gunter, Khargonekar, Pramod P.
Sufficient conditions are given under which an adaptive control system is robustly stable and achieves a guaranteed robust asymptotic performance level equal to that of the robust controller given...
A class of algorithms for identification in [infinity] (1992)
Gu, Guoxiang, Khargonekar, Pramod P.
In this paper, a class of algorithms for the problem of system identification in [infinity] are investigated. These algorithms are characterized by a two-stage structure and involve a class of window...
Decentralized simultaneous stabilization and reliable control using periodic feedback (1992)
Unyelioglu, Konur A., Bulent Ozguler, A., Khargonekar, Pramod P.
In this note we consider the simultaneous decentralized stabilization problem for linear, periodically time-varying, discrete time systems. We show that a finite number of periodically time-varying...
2 optimal control for sampled-data systems (1991)
Khargonekar, Pramod P., Sivashankar, N.
This paper considers an 2 optimal control problem for sampled-data systems. After defining a new 2 norm for sampled-data systems, we give a state space solution to the optimal controller synthesis...
H2-optimal control with an H[infinity]-constraint The state feedback case (1991)
Rotea, Mario A., Khargonekar, Pramod P.
In this paper we consider a mixed H2/H[infinity]-optimal control problem. It is assumed that the plant as well as the feedback controller are finite-dimensional and linear time-invariant, and that...
Identification in H infinity with Nonuniformly Spaced Frequency Response Measurements (1991)
Hüseyin Akçay, Guoxiang Gu, Pramod P. Khargonekar
In this paper, the problem of "system identification in H1 " is investigated in the case when the given frequency response data is not necessarily on a uniformly spaced grid of frequencies....
State-space solutions to standard H2 and H∞ control problems (1989)
Doyle, John C., Glover, Keith, Khargonekar, Pramod P., Francis, Bruce A.
Simple state-space formulas are derived for all controllers solving the following standard H∞ problem: For a given number γ>0, find all controllers such that the H∞ norm of the closed-loop...