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A consensus algorithm in CAT(0) space and its application to distributed fusion of phylogenetic trees

JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS 2018年第2期459卷 1149-1159页

作者： Chen, Sheng Shi, Peng Lim, Cheng-Chew Lu, Zhenyu Nanjing Univ Informat Sci & Technol Sch Informat & Control B DAT CICAEET Nanjing 210044 Jiangsu Peoples R China Univ Adelaide Sch Elect & Elect Engn Adelaide SA 5005 Australia Nanjing Univ Informat Sci & Technol Sch Elect & Informat Engn Nanjing 210044 Jiangsu Peoples R China

Based on convex analysis, a novel consensus algorithm of dynamical points in a CAT(0) space is developed in this paper, in which the associated communication graph uniformly contains a directed spanning tree. The proposed algorithm provides an efficient method of solving consensus problems in a general CAT(0) space, while having certain robustness against weak communication. The application of the new algorithm to the distributed fusion of phylogenetic trees is shown with demonstrative-case simulations, together with a study on the algorithm's robustness and efficiency. (C) 2017 Elsevier Inc. All rights reserved.

关键词： Geometric space consensus algorithm Data fusion Tree-type data

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Hierarchical distributed control for decentralized battery energy storage system based on consensus algorithm with pinning node

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Protection and Control of Modern Power Systems 2018年第1期3卷 52-60页

作者： Hanqing Yang Shihan Li Qi Li Weirong Chen School of Electrical Engineering Southwest Jiaotong UniversityPO Box 610031ChengduChina

A decentralized battery energy storage system(DBESS)is used for stabilizing power fluctuation in DC *** state of charge(SoC)among various battery energy storage units(BESU)during operation will reduce batteries’service life.A hierarchical distributed control method is proposed in this paper for SoC balancing and power control according to dispatching center requirement in DBESS.A consensus algorithm with pinning node is employed to allocate power among BESUs in the secondary control whereas in the primary control,the local controller of BESU adjusts output power according to the reference power from secondary *** of BESUs are selected to be pinning node for accepting command from dispatching center while other BESUs as following nodes which exchange output power and SoC information with the adjacent nodes through communication *** calculating reference power of each BESU by adopting consensus algorithm,the power sharing in DBESS is achieved according to their respective SoC of ***,the total output power of DBESS follows the varying requirements of dispatching *** stability of DBESS is also improved because of having no center *** feasibility of the proposed control strategy is validated by simulation results.

关键词： Decentralized battery energy storage system Hierarchical distributed control consensus algorithm Pinning node

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Blockchain Based consensus algorithm and Trustworthy Evaluation of Authenticated Subgraph Queries

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Computer Systems Science & Engineering 2023年第5期45卷 1743-1758页

作者： G.Sharmila M.K.Kavitha Devi Department of Computer Science&Engineering Syed Ammal Engineering CollegeRamanathapuram623502India Department of Computer Science&Engineering Thiagarajar College of EngineeringMadurai625015India

Over the past era,subgraph mining from a large collection of graph database is a crucial *** addition,scalability is another big problem due to insufficient *** are several security challenges associated with subgraph mining in today’s on-demand *** address this downside,our proposed work introduces a Blockchain-based consensus algorithm for Authenticated query search in the Large-Scale Dynamic Graphs(BCCA-LSDG).The two-fold process is handled in the proposed BCCA-LSDG:graph indexing and authenticated query search(query processing).A blockchain-based reputation system is meant to maintain the trust blockchain and cloud server of the proposed *** resolve the issues and provide safe big data transmission,the proposed technique also combines blockchain with a consensus algorithm *** of the big data is ensured by dividing the BC network into distinct networks,each with a restricted number of allowed entities,data kept in the cloud gate server,and data analysis in the *** consensus algorithm is crucial for maintaining the speed,performance and security of the *** Dual Similarity based MapReduce helps in mapping and reducing the relevant subgraphs with the use of optimal feature ***,the graph index refinement process is undertaken to improve the query *** query error,fuzzy logic is used to refine the index of the graph *** proposed technique outperforms advanced methodologies in both blockchain and non-blockchain systems,and the combination of blockchain and subgraph provides a secure communication platform,according to the findings.

关键词： Big data blockchain consensus algorithm trust management graph index

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Blockchain in Healthcare: Introducing Novel Proof of Accountability Voting (PoAV) consensus algorithm and Custom Blockchain Network 9

Blockchain in Healthcare: Introducing Novel Proof of Account...

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9th International Conference on Information Technology Research

作者： Kodithuwakku, G. L. Fernando, K. S. D. Univ Moratuwa Fac Informat Technol Moratuwa Sri Lanka

ISBN: (纸本)9798331511425;9798331511432

Blockchain technology, which was originally created for cryptocurrencies, has significant research gaps when applied to the healthcare domain. This paper tackles two important research gaps concerning blockchain implementation in healthcare: consensus algorithm and network design. While public blockchains are often undesirable for healthcare due to their inherent characteristics, private blockchains provide a more acceptable option. The major goal of this study is to offer an improved consensus algorithm and a blockchain network design that is tailored to healthcare requirements. The suggested system attempts to increase security, scalability, and decentralisation while tackling the unique constraints of maintaining sensitive patient data across a distributed network.

关键词： blockchain healthcare blockchain in healthcare consensus algorithm blockchain network

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Jointgraph: A DAG-based efficient consensus algorithm for consortium blockchains

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SOFTWARE-PRACTICE & EXPERIENCE 2021年第10期51卷 1987-1999页

作者： Fu Xiang Wang Huaimin Shi Peichang Ouyang Xue Zhang Xunhui Natl Univ Def Technol Sch Comp Changsha 410073 Hunan Peoples R China Key Lab Software Engn Complex Syst Changsha Hunan Peoples R China

The blockchain is a distributed ledger that records all transactions and operations in a shared manner. Public blockchains such as Bitcoin realize decentralization at the cost of mining overhead, which is not suitable for real-life scenarios requiring high throughput. Techniques such as the consortium blockchain improve efficiency through partial decentralization. However, the consensus algorithms used in the existing state-of-the-art consortium blockchains face many challenges when dealing with commercial applications. For example, the high communication overhead hinders the scalability of PBFT-based consensus algorithms even though they are efficient at small scale. Hashgraph, one of the most popular Directed Acyclic Graph-based (DAG-based) consensus algorithms, achieves good performance in scalability;however, it does not allow users' dynamic participation. To deal with these challenges, we propose Jointgraph, a Byzantine fault-tolerance consensus algorithm for consortium blockchains based on DAG. In Jointgraph, transactions are packed into events and validated by no less than 2/3 of all members. A supervisor is introduced in our design, who monitors member behaviors and improves consensus efficiency. Simulation results demonstrate that Jointgraph outperforms Hashgraph in both throughput and latency.

关键词： blockchain byzantine fault-tolerant consensus algorithm DAG supervisory

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Tree-Chain: A Lightweight consensus algorithm for IoT-based Blockchains 3

Tree-Chain: A Lightweight Consensus Algorithm for IoT-based ...

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3rd IEEE International Conference on Blockchain and Cryptocurrency (IEEE ICBC)

作者： Dorri, Ali Jurdak, Raja Queensland Univ Technol QUT Sch Comp Sci Trusted Networks Lab Brisbane Qld Australia

ISBN: (纸本)9781665435789

In this paper, we propose Tree-chain a fast scalable consensus algorithm that bases the validator selection on an existing function in relatively all existing blockchains: hash function output. Tree-chain is a leader selection consensus algorithm that moves away from a linear blockchain structure, to a tree-structured blockchain where each branch is managed by a particular validator. Each validator is periodically allocated to a random consensus code range which matches specific patterns of the most significant bits of the hash function output. Each validator is then responsible for transactions whose hash falls within the consensus code allocated to the validator. Because transactions are allocated deterministically to validators based on random consensus code allocations, Tree-chain eliminates the significant inefficiency of conventional blockchains for validator selection, such as proof-of work. Tree-chain does not require the validators to follow any additional algorithms before committing blocks which in turn significantly increases its throughput. Implementation results show that Tree-chain can run on small tiny IoT devices with limited resources which in turn highlights its resource efficiency.

关键词： Blockchain Internet of Things (IoT) consensus algorithm Scalability

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Raft consensus algorithm Based on Credit Model in Consortium Blockchain

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Wuhan University Journal of Natural Sciences 2020年第2期25卷 146-154页

作者： CHEN Yunfang LIU Ping ZHANG Wei School of Computer Science Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina Jiangsu Key Laboratory of Big Data Security and Intelligent Processing Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina

As one of the underlying technologies of the blockchain,the consensus algorithm plays a vital role in ensuring security and *** a consensus algorithm for the private blockchain,Raft has better performance than the rest of the consensus algorithms,and it does not cause problems such as the concentrated hashing power,resource waste and ***,Raft can only be used in a non-byzantine environment with a small network *** order to enable Raft to be used in a large-scale network with a certain number of byzantine nodes,this paper combines Raft and credit model to propose a Raft blockchain consensus algorithm based on credit model *** the node credit evaluation phase,RBF-based support vector machine is used as the anomaly detection method,and the node credit evaluation model is *** the Trust Nodes List(TNL)mechanism is introduced to make the consensus phase in a creditable network ***,the common node is synchronized to the consensus node to update the blockchain of the entire *** show that CRaft has better throughput and lower latency than the commonly used consortium blockchain consensus algorithm PBFT(Practical Byzantine Fault Tolerance).

关键词： credit model consensus algorithm consortium blockchain P2P network

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Simulation Study on the Convergence Time of a Discrete consensus algorithm for Distributed Task Assignment

Simulation Study on the Convergence Time of a Discrete Conse...

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IEEE International Conference on Systems, Man, and Cybernetics (SMC)

作者： Fanti, Maria Pia Mangini, Agostino Marcello Franceschelli, Mauro Pedroncelli, Giovanni Ukovich, Walter Politecn Bari Dept Elect & Informat Engn Bari Italy Univ Cagliari Dept Elect & Elect Engn I-09124 Cagliari Italy Univ Trieste Dept Engn & Architecture I-34127 Trieste Italy

ISBN: (纸本)9781479986965

This paper presents results on the convergence time of a previously proposed algorithm to solve the distributed task assignment problem on a network of agents. The considered algorithm consists in iterative local integer linear optimizations among the agents to cooperatively assign a set of tasks. Local optimizations are performed among a subset of randomly chosen neighboring agents. This paper discusses a simulation study on the number of iterations and time required by the algorithm to find the best task assignment given the limited information available at each iteration. Simulations on large and small networks with local optimizations that involve a varying number of agents have been performed.

关键词： consensus algorithm Distributed Optimization Task Assignment

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A Distributed Cooperative Control Strategy Based on consensus algorithm in DC Microgrid 13

A Distributed Cooperative Control Strategy Based on Consensu...

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13th IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Zhang, Xinlu Dong, Mi Ou, Jing Cent S Univ Dept Informat Sci & Engn Changsha Hunan Peoples R China

ISBN: (纸本)9781538637586

A distributed cooperative control strategy based on the consensus algorithm is proposed for the voltage regulation and load distribution in DC microgrid. Global information can be accurately shared in a distributed fashion by using a consensus protocol. At the secondary control level, the average voltage and current controllers are used in each converter to generate two correction terms to adjust the voltage set point for the local droop controller. Using this method can achieve DC bus voltage recovery and eliminate average voltage deviation, while ensuring proportional load sharing among sources. By introducing a proportional adjustment link in the current controller, the load sharing is optimized while balancing the cost of power generation. The effectiveness of the proposed control scheme is verified by detailed MATLAB / Simulink simulation.

关键词： DC microgrid distributed control droop control consensus algorithm voltage control

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Research on consensus algorithm in Coordinated Control of Unmanned Surface Vehicles 33

Research on Consensus Algorithm in Coordinated Control of Un...

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33rd Youth Academic Annual Conference of Chinese Association of Automation (YAC)

作者： Cao, Xuhang Zhang, Qingyong Zheng, Kanghua Zhang, Huajun Wuhan Univ Technol Sch Automat Wuhan 430070 Hubei Peoples R China

ISBN: (纸本)9781538672556

A consensus algorithm for coordinated control of unmanned surface vehicles (USVs) is studied. The USVs have different driving directions and initial velocities, so the consensus algorithm is needed to coordinate the directions and velocities of the USVs. Firstly, based on the first order linear model of USVs, get the first order nonlinear differential equations of high frequency, and the simulate environment of USVs. Then, based on the Vicsek model, the consensus algorithm in cooperative control of USVs is proposed. Aiming at the problem that USV's angular velocity lags behind the rudder angle, this paper improves the traditional PD control method, and adopts cascade PID control. So, USV can reach the same driving direction in a shorter time. Finally, simulations prove that the algorithm is feasible and compare the difference of efficiency between the PD controller and the cascade PID controller.

关键词： USVs consensus algorithm PD controller cascade PID

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