Browsing by Author "Sundaram, S."
Now showing items 1-20 of 22
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Conference Object
Control of quantized multi-agent systems with linear nearest neighbor rules: A finite field approach
Sundaram, S.; Hadjicostis, Christoforos N. (2010)We study the problem of controlling a multi-agent system where each agent is only allowed to be in a discrete and finite set of states. Each agent is capable of updating its state based on the states of its neighbors, and ...
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Article
Delayed observers for linear systems with unknown inputs
Sundaram, S.; Hadjicostis, Christoforos N. (2007)We present a method for constructing reduced-order state observers for linear systems with unknown inputs. Our approach provides a characterization of observers with delay, which eases the established necessary conditions ...
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Designing stable inverters and state observers for switched linear systems with unknown inputs
Sundaram, S.; Hadjicostis, Christoforos N. (2006)We present a method for estimating the inputs and states in discrete-time switched linear systems with unknown inputs. We first investigate the problem of system invertibility, which reconstructs the unknown inputs based ...
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Discussion on: "A comparison of sliding mode and unknown input observer for fault reconstruction"
Sundaram, S.; Hadjicostis, Christoforos N. (2006)The paper by Edwards and Tan compares sliding mode observers (SMOs) to unknown input observers (UIOs) for the purpose of reconstructing faults that affect linear dynamical systems in the presence of disturbances. This ...
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Distributed calculation of linear functions in noisy networks via linear iterations
Sundaram, S.; Hadjicostis, Christoforos N. (2008)Given a fixed network where each node has some given initial value, and under the constraint that each node receives noisy transmissions from its immediate neighbors, we provide a distributed scheme for any node to calculate ...
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Distributed consensus and linear functional calculation in networks: An observability perspective
Sundaram, S.; Hadjicostis, Christoforos N. (2007)We study the problem of performing sensor fusion and distributed consensus in networks, where the objective is to calculate some linear function of the initial sensor values at some or all of the sensors. We utilize a ...
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Distributed function calculation and consensus using linear iterative strategies
Sundaram, S.; Hadjicostis, Christoforos N. (2008)Given an arbitrary network of interconnected nodes, we develop and analyze a distributed strategy that enables a subset of the nodes to calculate any given function of the node values. Our scheme utilizes a linear iteration ...
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Distributed function calculation via linear iterations in the presence of malicious agents - Part I: Attacking the network
Sundaram, S.; Hadjicostis, Christoforos N. (2008)We consider the problem of distributed function calculation in the presence of faulty or malicious agents. In particular, we consider a setup where each node has an initial value and the goal is for (a subset of) the nodes ...
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Distributed function calculation via linear iterations in the presence of malicious agents - Part II: Overcoming malicious behavior
Sundaram, S.; Hadjicostis, Christoforos N. (2008)Given a network of interconnected nodes, each with a given initial value, we develop a distributed strategy that enables some or all of the nodes to calculate any arbitrary function of these initial values, despite the ...
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Article
Distributed function calculation via linear iterative strategies in the presence of malicious agents
Sundaram, S.; Hadjicostis, Christoforos N. (2011)Given a network of interconnected nodes, each with its own value (such as a measurement, position, vote, or other data), we develop a distributed strategy that enables some or all of the nodes to calculate any arbitrary ...
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Erratum: Time-delayed state estimator for linear systems with unknown inputs (International Journal of Control, Automation, and Systems)
Sundaram, S.; Hadjicostis, Christoforos N. (2005)
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Article
Error detection and correction in switched linear controllers via periodic and non-concurrent checks
Sundaram, S.; Hadjicostis, Christoforos N. (2006)Control systems that utilize switched linear controllers have proven to be useful (and, in some cases, essential) for accomplishing certain control objectives in particular classes of plants. These controllers are often ...
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Fault-tolerant convolution via chinese remainder codes constructed from non-coprime moduli
Sundaram, S.; Hadjicostis, Christoforos N. (2008)This paper develops a framework for performing fault-tolerant convolution via error-correcting codes based on the chinese remainder theorem (CRT) with non-coprime moduli. In contrast to convolution that is protected through ...
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Conference Object
Finite-time distributed consensus in graphs with time-invariant topologies
Sundaram, S.; Hadjicostis, Christoforos N. (2007)We present a method for achieving consensus in distributed systems in a finite number of time-steps. Our scheme involves a linear iteration where, at each time-step, each node updates its value to be a weighted average of ...
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Information dissemination in networks via linear iterative strategies over finite fields
Sundaram, S.; Hadjicostis, Christoforos N. (2009)Given an arbitrary network of interconnected nodes, each with an initial value from a discrete set, we consider the problem of distributively disseminating these initial values under the constraint that the nodes can only ...
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Linear iterative strategies for transmitting streams of values through sensor networks
Sundaram, S.; Hadjicostis, Christoforos N. (2009)For any given fixed network of interconnected nodes, with some nodes designated as sources and some nodes designated as sinks, we investigate the problem of transmitting a stream of values from every source node to all of ...
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On delayed observers for linear systems with unknown inputs
Sundaram, S.; Hadjicostis, Christoforos N. (2005)We present a method for constructing reduced-order state observers for linear systems with unknown inputs. Our design provides a characterization of observers with delay, which eases the established necessary conditions ...
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On the time complexity of information dissemination via linear iterative strategies
Sundaram, S.; Hadjicostis, Christoforos N. (2010)Given an arbitrary network of interconnected nodes, each with an initial value, we study the number of time-steps required for some (or all) of the nodes to gather all of the initial values via a linear iterative strategy. ...
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Optimal state estimators for linear systems with unknown inputs
Sundaram, S.; Hadjicostis, Christoforos N. (2006)We present a method for constructing linear minimum-variance unbiased state estimators for discrete-time linear stochastic systems with unknown inputs. Our design provides a characterization of estimators with delay, which ...
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Article
Partial state observers for linear systems with unknown inputs
Sundaram, S.; Hadjicostis, Christoforos N. (2008)We consider the problem of constructing partial state observers for discrete-time linear systems with unknown inputs. Specifically, for any given system, we develop a design procedure that characterizes the set of all ...