Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Consensus protocol"”.
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Improved blockchain - Proof-of-work consensus protocol - performance using machine learning
… increasing size because of the complexity of its consensus protocol known as Proof-of-Work (PoW). Many industries, researchers and organisation have been working on providing a solution to the performance issues of the technology but most of the proposed solutions has so far ended in proposing a …
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To ascertain if blockchain can facilitate the Internet of Things security and scalability requirements
Several consensus algorithms have been proposed as a way of resolving the Byzantine General problem, with respect to the blockchain consensus process. However, when these consensus algorithms are applied to a distributed, asynchronous network, some suffer with security and/or scalability issues, …
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Blocks' Network: Redesign Architecture based on Blockchain Technology
… is a global network that uses communication protocols. It is considered the most important system reached by humanity, which no one can abandon. However, this technology has become a weapon that threatens the privacy of users, especially in the client-server model, where data is stored and …
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JamNSync: A User-Friendly, Latency-Agnostic Virtual Rehearsal Platform for Music Ensembles
… synchronous rehearsal experience using a novel consensus protocol. Each musician only needs a basic understanding of playback systems and common audio devices. To account for non-deterministic audio latency in the browser, JamNSync provides a user-friendly audio alignment tool that efficiently …
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Design and Implementation of Predictive Control for Networked Multi-Process Systems
… the NMAS (networked multi-agent system) external consensus problem. The prediction method has been popular in networked single agent systems due to its capability of actively compensating for network-related constraints. This characteristic has motivated researchers to apply the prediction method …
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Generalized Consensus for Practical Fault-Tolerance
… presents Elpis, the first multi-leader XFT consensus protocol. By adopting the Generalized Consensus specification from the Crash Fault Tolerance model, we were able to devise a multi-leader protocol that exploits the commutativity property inherent in the commands ordered by the system. …
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Quorum consensus protocols for the client server architecture
… a new highly efficient, highly reliable quorum consensus protocol, the Quorum Rings (QR) protocol, specifically designed to take advantage of the client-server architecture. We will also introduce an algorithm that modifies existing quorum consensus protocols to work efficiently and reliably …
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Vault : fast bootstrapping for cryptocurrencies
… Vault builds on Algorand's proof-of-stake consensus protocol and uses several techniques to achieve its goals. First, Vault decouples the storage of recent transactions from the storage of account balances, which enables Vault to delete old account state. Second, Vault allows sharding state …
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A Low-latency Consensus Algorithm for Geographically Distributed Systems
… Caesar, a novel multi-leader Generalized Consensus protocol for geographically replicated systems. Caesar is able to achieve near-perfect availability, provide high performance - low latency and high throughput compared to the existing state-of-the- art, and tolerate replica failures. …
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Separating conflict-recovery from failure-recovery in distributed consensus
… the core of these distributed databases is their consensus protocol which must order concurrently submitted requests and ensure that the system can mask or recover from failures. Current state-of-the-art consensus protocols re-use their failure-recovery mechanism to resolve ordering conflicts. The …
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Efficient and egalitarian consensus
Consensus is a classic problem in distributed computing. Research on consensus has traditionally focused on the permissioned setting where participants are fixed and know each other beforehand. Recently, the digital currency Bitcoin has popularized a new line of research on consensus in a …
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Data-Driven Architecture to Increase Resilience In Multi-Agent Coordinated Missions
… architecture is developed for distributed consensus algorithms to increase fault-tolerance in a network of multiple high-order nonlinear systems under directed fixed topologies. In similarity with the natural organisms’ ability to recognize and remember specific pathogens to generate its …
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Distributed Control, Optimization, and State Estimation for Renewable Power System
… power systems are proposed based on the consensus protocol technique from graph theory. These techniques cover the three important problems in power systems, i.e., economic dispatch, state estimation, and optimal power flow. First, the Distributed Economic Dispatch (DED) approach is …
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Information Theory and Cooperative Control in Networked Multi-Agent Systems with Applications to Smart Grid
… in smart grid. We propose a leader-following consensus protocol for such interconnected systems and derive the sufficient conditions, in terms of communication topology and control parameters, for string stability. Simulation results and performance in terms of disturbance propagation are also …
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Fracture of the distal radius - outcome, primary surgery and treatment of malunion
A consensus protocol for treatment of distal radius fractures (DRF) has been developed to aid clinicians in treatment decision making. The protocol was evaluated in Paper I using a validated subjective outcome instrument, DASH in 518 consecutive patients. A good final subjective result was achieved …
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Formation control of multiple robots under packet loss
… Interpolation Predictor (LIP), and the Memory Consensus Protocol (MCP) highlights LSTM’s superior accuracy in trajectory prediction for AGVs and drones. The LSTM model was further integrated into closed-loop systems, where it significantly enhanced performance under feedback dynamics and …
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Distributed, adaptive deployment for nonholonomic mobile sensor networks : theory and experiments
… convergence, the mobile sensors implement a consensus protocol in continuous time assuming a fixed network topology and zero communication delays. The convergence and feasibility of the coverage control algorithm are verified through simulations in Matlab and Stage. The Matlab simulations …
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Consensus in multi-agent systems with time-delays
Different consensus problems in multi-agent systems have been addressed in this thesis. They represent improvements with respect to the state of the art. In the first part of the thesis in luding Chapters 2, 3, and 4, the state of the art of the representation and stability analysis of consensus …
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Potential-based analysis of social, communication, and distributed networks
… type of distributed algorithm for quantized consensus known as an unbiased quantized algorithm where a set of agents interact locally in a network in order to reach a consensus. We provide tight expressions for the expected convergence time of such dynamics over general static and …
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Blockchain and Distributed Consensus: From Security Analysis to Novel Applications
… and consistent transaction history through consensus, without involving a central authority. The decentralization, transparency, and consensus-driven security promised by blockchain are unprecedented and can potentially enable a wide range of new applications that prevail in the …
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