Browsing by Author "Hadjicostis, Christoforos N."
Now showing items 21-40 of 263
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Conference Object
Capacity of channels with memory and feedback: Encoder properties and dynamic programming
Charalambous, C. D.; Kourtellaris, C. K.; Hadjicostis, Christoforos N. (2010)This paper is concerned with capacity formulae for channels with memory and feedback, properties of the capacity achieving encoder, and dynamic programming for designing optimal encoders. The source is general and the ...
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Book
Coding Approaches to Fault Tolerance in Combinational and Dynamic Systems.
Hadjicostis, Christoforos N. (Kluwer Academic Publishers, 2002)
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Article
Coding approaches to fault tolerance in linear dynamic systems
Hadjicostis, Christoforos N.; Verghese, G. C. (2005)This paper discusses fault tolerance in discrete-time dynamic systems, such as finite-state controllers or computer simulations, with focus on the use of coding techniques to efficiently provide fault tolerance to linear ...
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Article
Coding techniques for fault-tolerant parallel prefix computations in Abelian groups
Hadjicostis, Christoforos N. (2004)This paper presents coding techniques that can be used to provide fault tolerance to a parallel prefix computation that is performed on a binary tree of processing nodes. More specifically, we discuss how a parallel prefix ...
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Article
Comments on "A modified reachability tree approach to analysis of unbounded Petri nets"
Ru, Y.; Wu, W.; Hadjicostis, Christoforos N. (2006)The above paper introduced the construction of a modified reachability tree (MRT) for (unbounded) Petri nets and its application to reachability, liveness, and deadlock analysis. This note shows via a counterexample that ...
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Conference Object
Constrained sensor selection for discrete event systems modeled by Petri nets
Ru, Y.; Hadjicostis, Christoforos N. (2011)This paper studies how to place a minimum number of sensors in discrete event systems modeled by partially observed Petri nets while maintaining structural observability. When the sensors are constrained to be associated ...
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Conference Object
Control of distributed energy resources for reactive power support
Robbins, B. A.; Domínguez-Garcia, A. D.; Hadjicostis, Christoforos N. (2011)This paper proposes a method to utilize distributed energy resources (DERs) to provide reactive power support for voltage control in electric power systems. Rather than controlling each of these resources directly, a ...
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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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Conference Object
Convergence of belief propagation algorithms on binary pairwise Gibbs random fields
Le, T.; Hadjicostis, Christoforos N. (2011)In this paper, we study the convergence of belief propagation algorithms (BPAs) on binary pairwise Gibbs random fields (BP-GRFs). Exploiting the equivalence of BPA on the graph associated with BP-GRF and the corresponding ...
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Conference Object
Convergence rate of a distributed algorithm for matrix scaling to doubly stochastic form
Domínguez-Garcia, A. D.; Hadjicostis, Christoforos N. (Institute of Electrical and Electronics Engineers Inc., 2014)Motivated by matrix scaling applications and, more recently, distributed averaging previous work has considered settings where the interconnections between components in a distributed system are captured by a strongly ...
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Conference Object
Coordination and control of distributed energy resources for provision of ancillary services
Domínguez-Garcia, A. D.; Hadjicostis, Christoforos N. (2010)This paper discusses the utilization of distributed energy resources on the distribution side of the power grid to provide a number of ancillary services. While the individual capability of these resources to provide grid ...
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Article
Coverage analysis of mobile agent trajectory via state-based opacity formulations
Saboori, A.; Hadjicostis, Christoforos N. (2011)This paper performs coverage analysis of mobile agent trajectory utilizing discrete event system models and employing state-based notions of opacity. Non-deterministic finite automata with partial observation on their ...
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Article
Current-state opacity formulations in probabilistic finite automata
Saboori, A.; Hadjicostis, Christoforos N. (2014)A system is said to be current-state opaque if the entrance of the system state to a set of secret states remains opaque (uncertain) to an intruder - at least until the system leaves the set of secret states. This notion ...
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Article
The d-identifying codes problem for vertex identification in graphs: Probabilistic analysis and an approximation algorithm
Xiao, Y.; Hadjicostis, Christoforos N.; Thulasiraman, K. (2006)Given a graph G(V, E), the identifying codes problem is to find the smallest set of vertices D ⊆ V such that no two vertices in V are adjacent to the same set of vertices in D. The identifying codes problem has been applied ...
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Conference Object
Decentralised minimum-time average consensus in digraphs
Charalambous, T.; Yuan, Y.; Yang, T.; Pan, W.; Hadjicostis, Christoforos N.; Johansson, M. (Institute of Electrical and Electronics Engineers Inc., 2013)Distributed algorithms for average consensus in directed graphs are typically asymptotic in the literature. In this work, we propose a protocol to distributively reach average consensus in a finite number of steps on ...
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Conference Object
Decentralized failure diagnosis in discrete event systems
Athanasopoulou, E.; Hadjicostis, Christoforos N. (2006)In this paper, we develop and analyze decentralized failure diagnosis schemes for systems that can be modeled as finite state machines (FSMs). We consider a scenario where we are given multiple local diagnosers (with partial ...
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Conference Object
Decentralized optimal dispatch of distributed energy resources
Domínguez-Garcia, A. D.; Cady, S. T.; Hadjicostis, Christoforos N. (2012)In this paper, we address the problem of optimally dispatching a set of distributed energy resources (DERs) without relying on a centralized decision maker. We consider a scenario where each DER can provide a certain ...
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Conference Object
Decentralized state estimation in discrete event systems under partially ordered observation sequences
Hadjicostis, Christoforos N.; Seatzu, C. (Institute of Electrical and Electronics Engineers Inc., 2016)We consider the problem of decentralized state estimation, where two or more observation sites send information to a coordinator who aims to determine the set of possible current states of a given discrete event system ...
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Article
Decoding algorithm and architecture for BCH codes under the Lee metric
Wu, Y.; Hadjicostis, Christoforos N. (2008)The Lee metric measures the circular distance between two elements in a cyclic group and is particularly appropriate as a measure of distance for data transmission under phase-shift-keying modulation over a white noise ...
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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 ...