ACC99-IEEE0267 Model reduction for analysis of cascading failures in power systems (2008)
Pablo A. Parrilo, Sanjay Lall, Fernando Paganini, George C. Verghese, Bernard C. Lesieutre, Jerrold E. Marsden
In this paper, we apply a principal-orthogonal decomposition based method to the model reduction of a hybrid, nonlinear model of a power network. The results demonstrate that the sequence of fault...
Operating Regimes of Signaling Cycles: Statics, Dynamics, and Noise Filtering (2007)
Gomez-Uribe, Carlos, Verghese, George C., Mirny, Leonid A.
A ubiquitous building block of signaling pathways is a cycle of covalent modification (e.g., phosphorylation and dephosphorylation in MAPK cascades). Our paper explores the kind of information...
Operating Regimes of Signaling Cycles: Statics, Dynamics, and Noise Filtering (2007)
Carlos Gomez-Uribe, George C. Verghese, Leonid A. Mirny
A ubiquitous building block of signaling pathways is a cycle of covalent modification (e.g., phosphorylation and dephosphorylation in MAPK cascades). Our paper explores the kind of information...
POWER SYSTEM MONITORING BASED ON RELAY AND CIRCUIT BREAKER INFORMATION (2007)
Christoforos N. Hadjicostis, George C. Verghese
In this paper we develop monitoring schemes that are able to detect and identify failures in power transmission lines by analyzing binary status information from relays and circuit breakers. The...
Pablo A. Parrilo, Sanjay Lall, George C. Verghese, Bernard C. Lesieutre, Jerrold E. Marsden
analysis of cascading failure for power networks
Christoforos N. Hadjicostis, George C. Verghese
The traditional approach to fault-tolerant computation has been via modular hardware redundancy.
Operating Regimes of Signaling Cycles: Statics, Dynamics, and Noise Filtering (2007)
George C. Verghese, Leonid Mirny
A ubiquitous building block of signaling pathways is a cycle of covalent modification (e.g., phosphorylation and dephosphorylation in MAPK cascades). Our paper explores the kind of information...
Willsky, Alan S., Verghese, George C.
In this report, we summarize our accomplishments in the research program presently supported by Grant AFOSR-88-0032 over the period from October 1, 1987 to September 30, 1988. The basic scope of this...
Asymptotic Orders of Reachability in Perturbed Linear Systems (2007)
Oezveren, Cueneyt M., Willsky, Alan S., Verghese, George C.
A framework for studying asymptotic orders of reachability in perturbed linear, time-invariant systems is developed. The systems of interest are defined by matrices that have Taylor or Laurent...
Optimally Robust Redundancy Relations for Failure Detection in Uncertain Systems (2007)
Lou, Xi-Cheng, Willsky, Alan S., Verghese, George C.
All failure detection methods are based, either explicitly or implicitly, on the use of redundancy, i.e. on (possibly dynamic) relations among the measured variables. The robustness of the failure...
Conditions for Scale-Based Decompositions in Singularly Perturbed Systems (2007)
Lou, Sheldon X., Verghese, George C., Willsky, Alan S., Coxson, Pamela G.
Singularly perturbed models of the form x(t) = A(epsilon)x(t), with A(epsilon) analytic at 0, nonsingular for epsilon Epsilon (0, epsilon 0] and singular at epsilon = 0, arise naturally in various...
Synthesis of Averaged Circuit Models for Switched Power Converters (2006)
Sanders, Seth R., Verghese, George C.
Averaged circuit models for switching power converters are useful for purposes of analysis and obtaining engineering intuition into the operation of these switched circuits. This paper develops...
Asymptotic Orders of Reachability in Perturbed Linear Systems (2006)
Ozveren, Cuneyt M., Verghese, George C., Willsky, Alan S.
A framework for studying asymptotic orders of reachability in perturbed linear. time-invariant systems is developed. The systems of interest are defined by matrices that have asymptotic expansions in...
Optimal Detection of Symmetric Mixed Quantum States (2002)
Eldar, Yonina C., Megretski, Alexandre, Verghese, George C.
We develop a sufficient condition for the least-squares measurement (LSM), or the square-root measurement, to minimize the probability of a detection error when distinguishing between a collection of...
Designing Optimal Quantum Detectors Via Semidefinite Programming (2002)
Eldar, Yonina C., Megretski, Alexandre, Verghese, George C.
We consider the problem of designing an optimal quantum detector to minimize the probability of a detection error when distinguishing between a collection of quantum states, represented by a set of...
A Scattering Framework for Decentralized Estimation Problems, (2002)
Levy,Bernard C., Castanon,David A., Verghese,George C., Willsky,Alan S.
In this paper we develop a comprehensive framework for the study of decentralized estimation problems. This approach imbeds a decentralized estimation problem into an equivalent scattering problem,...
Failure Detection with Uncertain Models, (2002)
Lou,Xi-Cheng, Willsky,Alan S., Verghese,George C.
In this paper the author considers the issue of robust failure detection. In one way or another all failure detection methods generate signals which tend to highlight the presence of particular...
Asymptotic Methods for the Analysis, Estimation, and Control of Stochastic Dynamic Systems. (2002)
Willsky,Alan S., Verghese,George C.
The basic scope of this grant is to carry out fundamental research in the analysis, control, and estimation of complex systems, with particular emphasis on the use of methods of asymptotic analysis...
Resource allocation in networks: A case study of the influence model (2002)
Sandip Roy, Bernard C. Lesieutre, George C. Verghese
Abstract — The allocation of resources in networks is studied in the context of the influence model, a stochastic network model composed of interacting Markov chains. First, some new results...
Banerjee, Soumitro (ed.), Verghese, George C. (ed.)
0-7803-5383-8
Network models: growth, dynamics, and failure (2001)
Sandip Roy, Chalee Asavathiratham, Bernard C. Lesieutre, George C. Verghese
This paper reports on preliminary explorations, both empirical and analytical, of probabilistic models of large-scale networks. We rst examine the structure of networks that grow by the addition of...
Model reduction for analysis of cascading failures in power systems (1999)
Parrilo, Pablo A., Lall, Sanjay, Paganini, Fernando, Verghese, George C., Lesieutre, Bernard C., Marsden, Jerrold E.
In this paper, we apply a principal-orthogonal decomposition based method to the model reduction of a hybrid, nonlinear model of a power network. The results demonstrate that the sequence of fault...
Monitoring Discrete Event Systems Using Petri Net Embeddings (1999)
Christoforos N. Hadjicostis, George C. Verghese
. In this paper we discuss a methodology for monitoring failures and other activity in discrete event systems that are described by Petri nets. Our method is based on embedding the given Petri net...
An Algebraic Approach to Time Scale Analysis of Singularly Perturbed Linear Systems, (1998)
Lou, Xi-Cheng, Willsky, Alan S., Verghese, George C.
This paper develops an algebraic approach to the multiple time scale analysis of perturbed linear systems based on the examination of the Smith form of the system matrix viewed as a matrix over a...
Failure Detection and Identification in Linear Time-Invariant Systems, (1998)
Massoumnia, Mohammad-Ali, Verghese, George C., Willsky, Alan S.
A solution to the problem of detecting and identifying control system component failures in linear time-invariant systems is given using the geometric concept of an unobservability subspace....
Stable, Robust Tracking by Sliding Mode Control, (1998)
Verghese, George C., Fernandez, Benito, Hedrick, J. K.
Sliding mode control is examined from the perspective of obtaining stable and robust tracking of an arbitrary time-varying reference by a multi-input-output, linear, time-invariant system driven by a...
Willsky, Alan S., Verghese, George C.
This report summarizes accomplishments in the research program presently supported by Grant AFOSR-82-0258 over a period from July 1, 1982 to Sept. 30, 1987, with primary emphasis on the...
Asymptotic Orders of Reachability in Perturbed Linear Systems, (1998)
Oezveren, Cueneyt M., Verghese, George C., Willsky, Alan S.
A framework for studying asymptotic orders of reachability in perturbed linear, time-invariant systems is developed. The systems of interest are defined by matrices that have asymptotic expansions in...
Lyapunov-Based Control for Switched Power Converters. (1998)
Sanders, Seth R., Verghese, George C.
Beginning with fundamental properties such as passivity or incremental passivity of the network elements comprising a switched power converter, the nominal open-loop operation of a broad class of...
Generalized Averaging Method for Power Conversion Circuits. (1998)
Sanders, Seth R., Noworolski, J. M., Liu, Xiaojun Z., Verghese, George C.
The method of state-space averaging has been successfully applied to pulse-width modulated power converters, but has its limitations with switched circuits that do not satisfy a 'small ripple'...
Reconstructing polygons from moments with connections to array processing (1995)
Peyman Milanfar, George C. Verghese, W. Ciera Karl, Alan S. Willsky
Abstract--In this paper, we establish a set of results slowing that the vertices of any simply connected planar polygonal region can be reconstructed from a finite number of its complex moments....
L!'DS-P-2209 Reconstructing Polygons from Moments with Connections to Array Processing * (1994)
Peyman Milanfar, George C. Verghese, W. Clem Karl, Alan S. Willsky
In this paper we establish a set of results showing that the vertices of any simply-connected planar polygonal region can be reconstructed from a finite number of its complex moments. These results...
LIDS-P-2141 Reconstructing Ellipsoids from Projections* (1993)
William C. Karl, George C. Verghese, Alan S. Willsky
In this paper we examine the problem of reconstructing a (possibly dynamic) ellipsoid from its (possibly inconsistent) orthogonal silhouette projections. We present a particularly convenient...
Principles of power electronics / John G. Kassakian, Martin F. Schlecht, George C. Verghese (1991)
Kassakian, John G, Schlecht, Martin F, Verghese, George C
Incluye índice
Stable, robust tracking by sliding mode control (1987)
Verghese, George C., Fernández R., Benito., Hedrick, J. K.
Caption title.
Asymptotic orders of reachability in perturbed linear systems (1987)
Özveren, Cüneyt M., Willsky, Alan S., Verghese, George C.
Bibliography: p. 36-37.
Asymptotic orders of reachability in perturbed linear systems (1987)
Ãzveren, Cüneyt M., Willsky, Alan S., Verghese, George C.
Text in two columns.
Asymptotic orders of reachability in perturbed linear systems (1987)
Ãzveren, Cüneyt M., Willsky, Alan S., Verghese, George C.
Text in two columns.
Asymptotic orders of reachability in perturbed linear systems (1987)
Özveren, Cüneyt M., Willsky, Alan S., Verghese, George C.
Bibliography: p. 36-37.
Stable, robust tracking by sliding mode control (1987)
Verghese, George C., Fernández R., Benito., Hedrick, J. K.
Caption title.
Infinite-frequency behaviour in generalized dynamical systems / (1978)
Thesis (Ph. D.)--Stanford University, 1978.
Operating Regimes of Signaling Cycles: Statics, Dynamics, and Noise Filtering
Gomez-Uribe, Carlos, Verghese, George C, Mirny, Leonid A
A ubiquitous building block of signaling pathways is a cycle of covalent modification (e.g., phosphorylation and dephosphorylation in MAPK cascades). Our paper explores the kind of information...