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检索条件"主题词=consensus algorithms"

共 311 条记录，以下是121-130 订阅

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Developing a consensus Algorithm Using Stepwise Refinement

Developing a Consensus Algorithm Using Stepwise Refinement

引用

13th International Conference on Formal Engineering Methods

作者： Bryans, Jeremy W. Newcastle Univ Sch Comp Sci Newcastle Upon Tyne NE1 7RU Tyne & Wear England

ISBN: (纸本)9783642245589

consensus problems arise in any area of computing where distributed processes must come to a joint decision. Although solutions to consensus problems have similar aims, they vary according to the processor faults and network properties that must be taken into account, and modifying these assumptions will lead to different algorithms. Reasoning about consensus protocols is subtle, and correctness proofs are often informal. This paper gives a fully formal development and proof of a known consensus algorithm using the step-wise refinement method Event-B. This allows us to manage the complexity of the proof process by factoring the proof of correctness into a number of refinement steps, and to carry out the proof task concurrently with the development. During the development the processor faults and network properties on which the development steps rely are identified. The research outlined here is motivated by the observation that making different choices at these points may lead to alternative algorithms and proofs, leading to a refinement tree of algorithms with partially shared proofs.

关键词： consensus algorithms Stepwise Refinement Verification Event-B

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OPTIMIZED TRANSMISSION FOR consensus IN WIRELESS SENSOR NETWORKS

OPTIMIZED TRANSMISSION FOR CONSENSUS IN WIRELESS SENSOR NETW...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Khobahi, Shahin Soltanalian, Mojtaba Univ Illinois Dept Elect & Comp Engn Chicago IL 60607 USA

ISBN: (纸本)9781538646588

In this paper, we present a consensus-based framework for decentralized estimation of deterministic parameters in wireless sensor networks (WSNs). In particular, we propose an optimization algorithm to design (possibly complex) sensor gains in order to achieve an estimate of the parameter of interest that is as accurate as possible. The proposed design algorithm employs a cyclic approach capable of handling various sensor gain constraints. In addition, each iteration of the proposed design framework is comprised of the Gram-Schmidt process and power-method like iterations, and as a result, enjoys a low-computational cost.

关键词： Alternating direction method of multipliers (ADMM) consensus algorithms decentralized estimation parameter estimation wireless sensor networks

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Newton-Raphson consensus for distributed convex optimization

Newton-Raphson consensus for distributed convex optimization

引用

50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC)

作者： Zanella, Filippo Varagnolo, Damiano Cenedese, Angelo Pillonetto, Gianluigi Schenato, Luca Univ. of Padova Italy

ISBN: (纸本)9781612848013

We study the problem of unconstrained distributed optimization in the context of multi-agents systems subject to limited communication connectivity. In particular we focus on the minimization of a sum of convex cost functions, where each component of the global function is available only to a specific agent and can thus be seen as a private local cost. The agents need to cooperate to compute the minimizer of the sum of all costs. We propose a consensus-like strategy to estimate a Newton-Raphson descending update for the local estimates of the global minimizer at each agent. In particular, the algorithm is based on the separation of time-scales principle and it is proved to converge to the global minimizer if a specific parameter that tunes the rate of convergence is chosen sufficiently small. We also provide numerical simulations and compare them with alternative distributed optimization strategies like the Alternating Direction Method of Multipliers and the Distributed Subgradient Method.

关键词： distributed optimization convex optimization consensus algorithms multi-agent systems Newton-Raphson methods

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CONVERGENCE SPEED IN DISTRIBUTED consensus AND AVERAGING

CONVERGENCE SPEED IN DISTRIBUTED CONSENSUS AND AVERAGING

引用

45th IEEE Conference on Decision and Control

作者： Olshevsky, Alex Tsitsiklis, John N. MIT Informat & Decis Syst Lab Cambridge MA 02139 USA

We study the convergence speed of distributed iterative algorithms for the consensus and averaging problems, with emphasis on the latter. We first consider the case of a fixed communication topology. We show that a simple adaptation of a consensus algorithm leads to an averaging algorithm. We prove lower bounds on the worst-case convergence time for various classes of linear, time-invariant, distributed consensus methods, and provide an algorithm that essentially matches those lower bounds. We then consider the case of a time-varying topology, and provide a polynomial-time averaging algorithm.

关键词： consensus algorithms distributed averaging cooperative control

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EVENT-BASED consensus FOR A CLASS OF HETEROGENEOUS MULTI-AGENT SYSTEMS: AN LMI APPROACH

EVENT-BASED CONSENSUS FOR A CLASS OF HETEROGENEOUS MULTI-AGE...

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IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Amini, Amir Mohammadi, Arash Asif, Amir Concordia Univ Elect & Comp Engn Montreal PQ Canada

ISBN: (纸本)9781509041176

Based on the theory of linear matrix inequalities (LMI), this paper proposes an event-based distributed consensus algorithm for linear multi-agent/sensor networks that are heterogeneous. The proposed scheme is event-based in the sense that each agent transmits its information to its neighbouring nodes only under predefined circumstances. Ensuring the stability of the closed-loop system, the Lyapunov theorem is utilized to compute design parameters (heterogeneous controller gains and transmission threshold) used in the proposed consensus algorithm. Numerical simulations demonstrate a performance gain in the convergence time and a reduction in the number of data transmissions with the proposed approach.

关键词： consensus algorithms Event-based transmission Distributed agent/sensor networks Linear Matrix Inequalities (LMIs)

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Randomized consensus with Attractive and Repulsive Links

Randomized Consensus with Attractive and Repulsive Links

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52nd IEEE Annual Conference on Decision and Control (CDC)

作者： Shi, Guodong Proutiere, Alexandre Johansson, Mikael Johansson, Karl H. Royal Inst Technol ACCESS Linnaeus Ctr Sch Elect Engn S-10044 Stockholm Sweden

ISBN: (纸本)9781467357173

We study convergence properties of a randomized consensus algorithm over a graph with both attractive and repulsive links. At each time instant, a node is randomly selected to interact with a random neighbor. Depending on if the link between the two nodes belongs to a given subgraph of attractive or repulsive links, the node update follows a standard attractive weighted average or a repulsive weighted average, respectively. The repulsive update has the opposite sign of the standard consensus update. In this way, it counteracts the consensus formation and can be seen as a model of link faults or malicious attacks in a communication network, or the impact of trust and antagonism in a social network. Various probabilistic convergence and divergence conditions are established. A threshold condition for the strength of the repulsive action is given for convergence in expectation: when the repulsive weight crosses this threshold value, the algorithm transits from convergence to divergence. An explicit value of the threshold is derived for classes of attractive and repulsive graphs. The results show that a single repulsive link can sometimes drastically change the behavior of the consensus algorithm. They also explicitly show how the robustness of the consensus algorithm depends on the size and other properties of the graphs.

关键词： random networks consensus algorithms gossiping sensor networks opinion dynamics social networks

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Ultrafast consensus in small-world networks

Ultrafast consensus in small-world networks

引用

American Control Conference 2005 (ACC)

作者： Olfati-Saber, R CALTECH Pasadena CA 91125 USA

ISBN: (纸本)0780390989

In this paper, we demonstrate a phase transition phenomenon in algebraic connectivity of small-world networks. Algebraic connectivity of a graph is the second smallest eigenvalue of its Laplacian matrix and a measure of speed of solving consensus problems in networks. We demonstrate that it is possible to dramatically increase the algebraic connectivity of a regular complex network by 1000 times or more without adding new links or nodes to the network. This implies that a consensus problem can be solved incredibly fast on certain small-world networks giving rise to a network design algorithm for ultrafast information networks. Our study relies on a procedure called "random rewiring" due to Watts & Strogatz (Nature, 1998). Extensive numerical results are provided to support our claims and conjectures. We prove that the mean of the bulk Laplacian spectrum of a complex network remains invariant under random rewiring. The same property only asymptotically holds for scale-free networks. A relationship between increasing the algebraic connectivity of complex networks and robustness to link and node failures is also shown. This is an alternative approach to the use of percolation theory for analysis of network robustness. We also show some connections between our conjectures and certain open problems in the theory of random matrices.

关键词： small-world networks networked systems consensus algorithms phase transition graph Laplacians algebraic connectivity network robustness random matrices

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Information-weighted consensus Filtering under Limited Communication 22

Information-weighted Consensus Filtering under Limited Commu...

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22nd World Congress of the International Federation of Automatic Control (IFAC)

作者： Khan, Shiraz Hwang, Inseok Purdue Univ Sch Aeronaut & Astronaut W Lafayette IN 47906 USA

ISBN: (纸本)9781713872344

A distributed sensor network refers to a set of stationary or mobile agents equipped with sensors, each of which observes and estimates the state of some system, while utilizing the communication channels of the sensor network to improve the overall state estimation performance of the network. In particular, consensus-based distributed state estimation algorithms can compute accurate state estimates of the system at each agent under relaxed observability conditions, using a low communication bandwidth. A drawback of many existing consensus-based approaches is that they are developed under the presumption that a large number of consensus subiterations are used, which may not be possible in large-scale sensor networks, in the presence of communication delays and/or energy constraints. In this paper, we develop an extension of the Information-weighted consensus Filter (ICF) for the case where only a limited number of consensus subiterations are possible. Through mathematical analysis and numerical simulations, it is shown that the proposed algorithm improves upon the existing algorithms under identical computation and communication requirements. Copyright (c) 2023 The Authors.

关键词： Networked systems consensus algorithms distributed state estimation multi-agent systems wireless sensor networks

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A Journey from Commit Processing in Distributed Databases to consensus in Blockchain 38

A Journey from Commit Processing in Distributed Databases to...

引用

38th IEEE International Conference on Data Engineering (ICDE)

作者： Kant, Kamal Pandey, Sarvesh Shanker, Udai MMM Univ Technol Dept Comp Sci & Engn Gorakhpur Uttar Pradesh India BHU Dept Comp Sci MMV Varanasi Uttar Pradesh India MMMUT Dept Comp Sci & Engn Gorakhpur Uttar Pradesh India

ISBN: (数字)9781665408837

ISBN: (纸本)9781665408837

Blockchain Technology (BT) is a futuristic data management technology that eliminates the intermediary/third-party/central authority as it is operated over a peer-to-peer network running cryptographic protocols. It is tamper-proof as it utilizes a cryptographic hash feature. Some other features, it offers, are transparency, security, inalterability, immutability, and decentralization;these features of the BTs have acquired the wide attention of the computing research community. While a transaction is occurring between two parties, it ensures that the trust is a consensus-driven built-in technology component instead of relying on a third party for the same. With the help of a consensus algorithm, the newly generated block is appended at the end of the already existing chain. In this paper, a thorough analysis of the various blockchain consensus algorithms is conducted including their benefits and drawbacks. Finally, it enlists the challenges and opportunities in designing blockchain consensus algorithms. Further, it proposes an idea for designing a blockchain consensus algorithm and concludes the discussion.

关键词： Blockchain Transparency Privacy Leader Selection Cryptography consensus algorithms

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Enhancing wireless networked monitoring system sustainability by multi-hop consensus algorithm 6

Enhancing wireless networked monitoring system sustainabilit...

引用

IEEE Workshop on Environmental Energy and Structural Monitoring Systems (EESMS)

作者： Frezzetti, Antonio Manfredi, Sabato Univ Naples Federico II Dept Elect Engn & Technol Informat DIETI Naples Italy

ISBN: (纸本)9781479949885

The widely studied consensus protocols have been increasingly used in industrial monitoring applications to support distributed process control. As the theoretical convergence rate covers vast interests in literature, techniques to speed up the convergence rate of consensus have been extensively explored, whereas their effects on the energetic consumption and on the sensor node technology have received a relatively lower attention. This work proposes to analyze jointly the energetic consumption and the consensus convergence rate in a Wireless Sensor Network scenario. Two different consensus techniques have been compared: the single-hop and the multi-hop algorithms. An environmental simulator has been built to validate the above techniques. Results show that multi-hop algorithm may be preferable to preserve the network lifetime, while the single-hop is more suitable in order to achieve higher speed of convergence.

关键词： Wireless Sensor networks consensus algorithms Networked Monitoring systems

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