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检索条件"主题词=Consensus algorithm"

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Distributed Large Signal Stabilization for Autonomous DC Microgrids Feeding Constant Power Loads

Distributed Large Signal Stabilization for Autonomous DC Mic...

引用

Chinese Automation Congress (CAC)

作者： Yu Song Chuanlin Zhang Chenggang Cui Collage of Automation Engineering Shanghai University of Electric Power Shanghai China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

In this paper, a composite control method is proposed to solve the voltage instability of nonlinear systems in distributed DC microgrids (MGs). The electrical coupling of each distributed generators (DGs) and the load uncertainties are considered as a lumped disturbance in each subsystem. It can be effectively estimated by the nonlinear disturbance observer (NDO). Then, a domination controller is designed for stabilizing DC/DC boost converter feeding constant power loads (CPLs). The proposed controller can guarantee fast voltage convergence in the sense of large signal stability. Moreover, by a consensus algorithm, the internal voltage state of DGs can be dynamically updated, and the voltage deviation caused by the droop control can be compensated in secondary layer. Therefore, a distributed microgrid (MG) model is established by simulation. A variety of conditions are conducted in order to verify the effectiveness of the proposed distributed large signal stabilization algorithm.

关键词： Voltage control Power system stability Stability criteria Mathematical model Microgrids consensus algorithm Uncertainty

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Allocating Resource for Task Groups in MEC IoT Systems with Reinforcement Learning

Allocating Resource for Task Groups in MEC IoT Systems with ...

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IEEE International Conference on Electronic Information and Communication Technology (ICEICT)

作者： Chidiebere Sunday Chidume Qianyue Qi Chao Zhang School of Information and Communications Engineering Xi'an Jiaotong University Xi’ an China

ISBN: (数字)9781728190457

ISBN: (纸本)9781728190464

The virtualization of Real World Object (RWO), coupled with its association with mobile edge computing (MEC) server, is gaining popularity in our today's internet of things (IoT) network. We see the prevalence in the savings it brings in the node's resources to execute the task by an application, thereby realizing the IoT vision. This paper looked at the interaction between a task group and the MEC server as a solution to reduce the average cost in the consumed power and delay in processing task and consequently to lead to a high network lifetime. To achieve this, we have added to the functionality of the virtual object (VO) and combined the ideas of the familiar schemes in a Mobile-edge learning and consensus algorithm. Markov's decision process is used to model a task group's choice, or the MEC server and solution got using a reinforcement learning algorithm. The simulations, when compared to some earlier schemes, showed significant improvement in power consumption, task processing delay, and network lifetime.

关键词： Reinforcement learning consensus algorithm Markov processes Delays Numerical models Servers Task analysis

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Constrained Distributed Nonconvex Optimization over Time-varying Directed Graphs

Constrained Distributed Nonconvex Optimization over Time-var...

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IEEE Conference on Decision and Control

作者： Zhiyu He Jianping He Cailian Chen Xinping Guan Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9781728174471

ISBN: (纸本)9781728174488

This paper addresses a class of constrained distributed nonconvex optimization problems involving univariate objective functions, considering time-varying directed networks. We propose a novel algorithm named Extended-CPCA (E-CPCA), exploiting the notion of combining Chebyshev polynomial approximation and average consensus. The proposed algorithm is i) able to yield ε globally optimal solutions for any arbitrarily small given tolerance ε, ii) efficient in terms of both oracle complexities and inter-agent communication costs, and iii) distributed terminable when the specified precision requirement is met. The idea of leveraging polynomial proxy and consensus to deal with the mentioned problems over static undirected graphs is first presented in our previous work. The novelties of this work lie in i) the utilization of push-sum average consensus with distributed stopping mechanism to enable agents to acquire a proxy for the global objective over time-varying digraphs without much wastes of extra communications, and ii) the transformation of the optimization of this global proxy into a semidefinite program to help in obtaining solutions in a fast and reliable manner. Both the analysis and simulations are provided to illustrate the efficacy of the proposed algorithm.

关键词： Optimization Chebyshev approximation Approximation algorithms Linear programming Directed graphs consensus algorithm Robot sensing systems

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A High-Performance Distributed File System for Mass Data

A High-Performance Distributed File System for Mass Data

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International Conference on Computer and Communications (ICCC)

作者： Shuaiyu Jin Qing Yan Yue Zhang Jie Yang Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9781728186351

ISBN: (纸本)9781728186368

With the rapid development of the mobile Internet and cloud computing, storage sub system's pressure increasing fast as the critical process needs more powerful engines. The paper realizes a high-performance distributed file system based on raft protocol. Our file system guarantees the reliability of data through replication. Write-Ahead Logging (WAL) and raft consensus algorithm provide atomicity, durability and file distribution. In order to solve the problem of data fragmentation in distributed systems, we design an automatic fragmentation and load balancing mechanism based on consistent hashing. Each file goes through the raft state machine so that a few machines crash without I/O error. We also implement the FUSE interface for the users to mount and work on files. Performance measurements under some typical workloads show that our file system has excellent I/O performance.

关键词： File systems Fuses Scalability Distributed databases consensus algorithm Tools Computer crashes

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An Efficient Blockchain-based Cross-domain Authentication and Secure Certificate Revocation Scheme

An Efficient Blockchain-based Cross-domain Authentication an...

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International Conference on Computer and Communications (ICCC)

作者： Pengpeng Gu Liquan Chen School of Cyber Science and Engineering Southeast University Nanjing China Purple Mountain Laboratories for Network and Communication Security Nanjing China

ISBN: (数字)9781728186351

ISBN: (纸本)9781728186368

The existing cross-domain authentication mechanisms are established based on well-known Public Key Infrastructure (PKI) systems, where digital certificates issued by Certificate Authority(CA) serve to authenticate the identity of entities. The complex authentication path, accompanied by multiple signatures and verifications, causes low authentication efficiency. In addition, resulting from an “update gap” between Certificate Revocation List(CRL) and Online Certificate Status Protocol(OCSP) mechanism, the revoked certificates will be exposed to DDoS attacks. For addressing aforementioned two challenges, an efficient blockchain-based authentication and secure certificate revocation scheme is proposed. Based on the non-tamperability and traceability of the blockchain, the signature module of X.509 digital certificate is replaced by the certificate hash value which serves as the trust certificate between domains. Furthermore, a consensus algorithm is adopted for random number hash broadcasting to improve efficiency. Theoretical analysis shows the proposed scheme has the security characteristics of non-repudiation, anonymity and anti DDoS attack. The experimental results demonstrate the proposed scheme has the advantage over existing cross-domain authentication and certificate revocation scheme at communication and computing cost and security respectively.

关键词： Conferences Authentication Public key consensus algorithm Blockchain Broadcasting Denial-of-service attack

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Efficient and Secure Energy Trading in Internet of Electric Vehicles Using IOTA Blockchain

Efficient and Secure Energy Trading in Internet of Electric ...

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International Symposium on High Capacity Optical Networks and Enabling Technologies, HONET

作者： Mudassir Ali Adeel Anjum Adnan Anjum Muazzam A. Khan COMSATS University Islamabad Islamabad Pakistan IBM Pakistan Quaid-i-Azam University Islamabad Pakistan

ISBN: (数字)9780738105277

ISBN: (纸本)9781665423007

The Internet of Electric Vehicle (IoEV) energy trading is where the Electric Vehicles (EVs) provide energy to vehicles, grids, community, and buildings. A scalable, efficient, secure, and best price selection scheme is needed that supports the IoEV energy trading transaction. The traditional blockchain is used in the existing researches to achieve these needs. This paper proposes an efficient and secure energy trading scheme in IoEV energy trading using the IOTA blockchain. EVs privacy protection algorithm is proposed in which somebody cannot track EV's exact position. The Stackelberg game theory technique is used to select the best seller at a given time slot and to perform the negotiation between buyers and sellers on the energy price in an off-blockchain manner. The empirical analysis shows that the proposed scheme performs better than the traditional techniques in terms of efficiency, privacy, and energy price.

关键词： Blockchain Privacy Security Power markets Faces consensus algorithm Computer science

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A Survey on Blockchain and Edge Computing applied to the Internet of Vehicles

A Survey on Blockchain and Edge Computing applied to the Int...

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International Symposium on Advanced Networks and Telecommunication Systems (ANTS)

作者： Anderson Queiroz Eduardo Oliveira Maria Barbosa Kelvin Dias Centro de informática Universidade Federal de Pernambuco Recife Brazil

ISBN: (数字)9781728192901

ISBN: (纸本)9781728192918

With the advent of Intelligent Transportation Systems (ITS), data from various sensors embedded into vehicles or smart cities infrastructure are of utmost importance. This ecosystem will require processing power and efficient trust mechanisms for information exchange in vehicle-to-everything (V2X) communications. To accomplish these requirements, both edge computing and blockchain have been recently adopted towards a secure, distributed, and computation empowered Internet of Vehicles (IoV). This paper surveys prominent solutions for blockchain-based vehicular edge computing (VEC), provides a taxonomy, highlights their main features, advantages, and limitations to provide subsidies for further proposals.

关键词： Cloud computing Smart cities Decision making Blockchain consensus algorithm Proposals Edge computing

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Model of a Monitoring System for Academic Performance and the Issuance of Diplomas Using Blockchain Technology

Model of a Monitoring System for Academic Performance and th...

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IEEE Conference on Quality Management, Transport and Information Security, Information Technologies (IT&MQ&IS)

作者： Andrey Averin Daria Snegireva Anton Ladejshchikov South Ural State University (national research university) Chelyabinsk Russia

ISBN: (数字)9781728181790

ISBN: (纸本)9781728181806

Nowadays, verification of the diploma and monitoring student academic performance has become a burning issue. This is ongoing process that starts from the moment a student enters a university and ends with diploma issue, with the ability to further verify their accuracy. This article describes the model for monitoring student performance and the issuance of diplomas using blockchain technology, its elements and structure, process diplomas release, the possibility of further verification of diplomas and student grades.

关键词： Blockchain Monitoring Bitcoin Performance evaluation Education consensus algorithm Computer architecture

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EduBlock: Securing Educational Documents using Blockchain Technology

EduBlock: Securing Educational Documents using Blockchain Te...

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International Conference on Computing and Networking Technology (ICCNT)

作者： Pavitra Haveri U.B. Rashmi D.G. Narayan K. Nagaratna K. Shivaraj School of Computer Science & Engineering KLE Technological University Hubballi India

ISBN: (数字)9781728168517

ISBN: (纸本)9781728168524

Bitcoin and Cryptocurrencies are the most popular and the earliest applications of Blockchain. A Blockchain is a public ledger that is distributed and decentralized and it is used to carry out transactions online across the entire network of computer systems. It is a recent technology adopted for data security. The non-modifiable property of the blockchain helps to overcome the problem of document forgery. According to researches, about one million students graduate each year and the document issuing authorities have seemed to be compromised for the security credentials of student data. Due to a lack of effective anti-forge mechanism, forged documents often get unnoticed. The use of physical copies of documents creates a huge overhead as it involves manual verification, paper storage, and manual auditing. Various agencies fail to verify the authenticity of the documents and create loopholes. In this paper, in an attempt to solve the above problem, we design a multi-node private blockchain network using the Ethereum framework and create an off-chain storage i.e. private Interplanetary File System (IPFS) to store the documents. We also evaluate the performance of Ethereum blockchain by analysing the impact of various parameters such as varying difficulty level, load, network size, and consensus algorithms.

关键词： Blockchain Security Peer-to-peer computing consensus algorithm Smart contracts Manuals Government

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Selective Deletion in a Blockchain

Selective Deletion in a Blockchain

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International Conference on Distributed Computing Systems

作者： Peter Hillmann Marcus Knüpfer Erik Heiland Andreas Karcher Bundeswehr University Munich Neubiberg Germany

ISBN: (数字)9781728170022

ISBN: (纸本)9781728170039

The constantly growing size of blockchains becomes a challenge with the increasing usage. Especially the storage of unwanted data in a blockchain is an issue, because it cannot be removed naturally. In order to counteract this problem, we present the first concept for the selective deletion of single entries in a blockchain. For this purpose, the general consensus algorithm is extended by the functionality of regularly creating summary blocks. Previous data of the chain are summarized and stored again in a new block, leaving out unwanted information. With a shifting marker of the Genesis Block, data can be deleted from the beginning of a blockchain. In this way, the technology of the blockchain becomes fully transactional. The concept is independent of a specific block structure, network structure, or consensus algorithm. Moreover, this functionality can be adapted to current blockchains to solve multiple problems related to scalability. This approach enables the transfer of blockchain technology to further fields of application, among others in the area of Industry 4.0 and Product Life-cycle Management.

关键词： Industries Scalability Conferences Blockchain consensus algorithm Distributed computing

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