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41.
This paper presents a framework to carry out optimal power flow in a coordinated multi-transaction/utilities decentralized system. An AC power flow model has been used in this work for independent optimal dispatch of each utility. The global economic optimal solution of the whole electric energy system with congestion management has also been done in this work using the interior point (IP) optimization procedure. In this approach, each participant tries to maximize its own profit with the help of information announced by the operator which are information related to system security constraints and public issues. The developed algorithm can be run in parallel, either to carry out numerical simulations or to obtain an optimal generation schedule in an actual multi-utility electric system. The study has been conducted on a three utility modified IEEE-30 bus system with two market models and six utility modified IEEE-118 bus system. The results clearly show the effectiveness of the suggested IP optimization based optimal generation schedule in decentralized scenario. It has been demonstrated that the suggested decentralized approach produces improved optimal dispatch solution with enhanced market benefits and can effectively manage the congestion in the system as compared to the centralized approach. 相似文献
42.
《Digital Communications & Networks》2022,8(5):591-603
With the rapid advancement of cloud computing, cloud storage services have developed rapidly. One issue that has attracted particular attention in such remote storage services is that cloud storage servers are not enough to reliably save and maintain data, which greatly affects users’ confidence in purchasing and consuming cloud storage services. Traditional data integrity auditing techniques for cloud data storage are centralized, which faces huge security risks due to single-point-of-failure and vulnerabilities of central auditing servers. Blockchain technology offers a new approach to this problem. Many researchers have endeavored to employ the blockchain for data integrity auditing. Based on the search of relevant papers, we found that existing literature lacks a thorough survey of blockchain-based integrity auditing for cloud data. In this paper, we make an in-depth survey on cloud data integrity auditing based on blockchain. Firstly, we cover essential basic knowledge of integrity auditing for cloud data and blockchain techniques. Then, we propose a series of requirements for evaluating existing Blockchain-based Data Integrity Auditing (BDIA) schemes. Furthermore, we provide a comprehensive review of existing BDIA schemes and evaluate them based on our proposed criteria. Finally, according to our completed review and analysis, we explore some open issues and suggest research directions worthy of further efforts in the future. 相似文献
43.
远程证明是构建可信网络的核心。但是,当前的远程证明模型仅面向有中心的网络,存在网关中心化、决策单点化的问题,并不适用于去中心的场景。针对去中心分布式网络环境中计算节点无法进行远程证明的问题,借鉴区块链的思想,提出了一种基于区块链的远程证明模型(Remote Attestation Based on blockchain,RABBC),并重点描述了模型框架、区块链核心结构和协议过程。分析表明,RABBC具有去中心化、可追溯、匿名、不可篡改的安全特性,并具备较高的效率。 相似文献
44.
With the proliferation of Web services, scientific applications are more and more designed as temporal compositions of services, commonly referred to as workflows. To address this paradigm shift, different workflow management systems have been proposed. While their efficiency has been established over centralized static systems, it is questionable over decentralized failure-prone platforms.Scientific applications recently started to be deployed over large distributed computing platforms, leading to new issues, like elasticity, i.e., the possibility to dynamically refine, at runtime, the amount of resources dedicated to an application. This raised again the demand for new programming models, able to express autonomic self-coordination of services in a dynamic platform.Nature-inspired, rule-based computing models recently gained a lot of attention in this context. They are able to naturally express parallelism, distribution, and autonomic adaptation. While their high expressiveness and adequacy for this context has been established, such models severely suffer from a lack of proof of concepts. In this paper, we concretely show how to leverage such models in this context. We focus on the design, the implementation and the experimental validation of a chemistry-inspired scientific workflow management system. 相似文献
45.
企业规模的扩大和环境的剧烈变化正在使企业的组织结构和经营活动越来越复杂。从企业动态演化的角度来看。组织结构不仅仅是一个静态和比较分析的概念,更是一个以提高企业绩效为目的、在长期内赢得竞争优势的过程。组织结构从决策权力分配的特征考虑可以分为集权模式和分权模式。通过一个绩效景观模拟模型可以观察到,当企业的决策问题结构"可分解"时,永久分权的组织模式能够给企业带来快速发展的能力,在短期和长期内都能实现较高的绩效。当决策结构"不可分解"时,一种先分权再集权的整合模式在长期内可以使企业达到最佳绩效,但是企业必须承受前期分权模式带来的绩效损失。在决策结构"不可分解"的情况下,只要允许企业分权游走足够长的时间,企业的绩效总能超过永久集权模式的游走,并且复杂性的增加并没有明显削弱整合模式相对集权模式提升绩效的能力。 相似文献
46.
当前,不论是政府、开发商,还是大型科技公司,都纷纷投身于智慧城市的建设中,期望打造出一个高效、方便(且盈利的)的\"智慧\"大都市,以适应和调和城市发展的快速节奏.虽然由无人机、平衡车和闪亮的反光玻璃高楼等典型智慧城市愿景构建出的未来城市很诱人,但现实是,真正的高品质(智慧)城市包含着自下而上的繁杂和城市活力,这对城市的整... 相似文献
47.
针对目前较少研究去中心化联邦学习中的激励机制设计,且已有联邦学习激励机制较少以全局模型效果为出发点的现状,该文为去中心化联邦学习加入了基于合同理论的联邦学习激励机制,提出一种新的可激励的联邦学习模型。使用区块链与星际文件系统(IPFS)取代传统联邦学习的中央服务器,用于模型参数存储与分发,在此基础上使用一个合同发布者来负责合同的制定和发布,各个联邦学习参与方结合本地数据质量选择签订合同。每轮本地训练结束后合同发布者将对各个本地训练模型进行评估,若满足签订合同时约定的奖励发放条件则发放相应的奖励,同时全局模型的聚合也基于奖励结果进行模型参数的聚合。通过在MNIST数据集以及行业用电量数据集上进行实验验证,相比于传统联邦学习,加入激励机制后的联邦学习训练得到的全局模型效果更优,同时去中心化的结构也提高了联邦学习的鲁棒性。 相似文献
48.