Results 21 to 30 of about 1,768 (148)
Generative blockchain-based covert communication model based on Markov chain [PDF]
, 2022 To solve the problems of high channel construction risk, information crossover, and insufficient concealment in the blockchain covert communication, a generative blockchain-based covert communication model based on Markov chain was proposed.First, the ...
Wei LIU +3 more
core +1 more source
智能科学与技术学报, 2022 我国现阶段仍以小规模农业为主，如何在小农、小地块的农业生产经营方式下发展适宜的智慧农业颇具挑战。基于此，提出一种结合联邦学习与区块链技术的分布式农业人工智能框架，使得在数据不共享的情况下，能达到训练模型的目的，并可建立参与方的激励机制。该框架有助于充分利用农业多源异构数据，减少对用户数据量的要求，发展因地制宜的决策模型，促进小规模农业的产销衔接。
康孟珍 +7 more
doaj +1 more source
Method for detecting collusion attack node in road condition information sharing based on reputation point [PDF]
, 2021 Aiming at the problem that on occasion of the release of false road condition information by collusion nodes in the Internet of vehicles collaboratively, message authenticity could not be guaranteed in the process of road condition information sharing, a
Hao TANG, Shichang XUAN, Wu YANG
core +1 more source
大数据, 2023 感知数据交易能将感知数据转化为经济价值，促进数据的有效利用和共享。为了确保感知数据交易的可靠性和隐私安全，提出了一个基于混洗差分隐私的区块链感知数据交易方案。该方案设置了审计节点进行用户筛选和任务执行，混洗节点进行争议处理和奖励分发，并使用混洗模型下的差分隐私技术对用户的数据进行加噪。此外，还使用加法秘密共享技术划分数据到r个混洗器，以隐藏用户和数据的映射关系。该方案不需要可信的第三方，数据消费者可通过区块链交易平台发布任务并进行广播，进行安全隐私的数据交易。同时，根据隐私放大定理 ...
李云辉, 陈家辉
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Dizhen xuebao, 2022 阿拉斯加地区由不同地质时期的地体向北增生而成，经历了漫长的构造演化，地质构造复杂。ANF （Array Network Facility）网站新近提供的来自USArray地震台网记录的地震台站观测数据填补了阿拉斯加地区西部和北部的观测空白，本文选取该区域中345个台站记录的5 638个地震事件的P波、S波到时数据，采用区域双差地震层析成像方法反演得到了该地区的岩石圈三维P波速度模型和地震重定位结果。研究结果显示：阿拉斯加西部太平洋板块的俯冲倾角较大，深部地幔楔表现为P波低速异常 ...
Shaoxian Zhou, Mei Xue
doaj +1 more source
Research on efficient and secure cross-domain data sharing of IoV under blockchain architecture [PDF]
, 2023 To solve the problems of data disclosure, uncontrolled data access, and inefficiency of cross-domain data sharing in the Internet of vehicles (IoV), an efficient and secure cross-domain data sharing scheme of IoV under blockchain architecture was ...
Tiancong CAO, Xuejiao LIU, Yingjie XIA
core +1 more source
, 2019 重大科技基础设施是现代科学研究取得进展和突破必不可少的支撑条件和技术手段。世界各国,特别是科技发达国家,非常重视重大科技基础设施的战略规划、前瞻部署、建设和应用。本文回顾了近年来重大科技基础设施领域世界各国的战略规划、项目部署,以及相关的最新举措,从八个方面分析了现阶段重大科技基础设施领域的国际发展动向和趋势特点,总结了我国近两年来在重大科技基础设施领域的新动向,并从中得到几点启示供决策者参考。
曾钢 +5 more
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Blockchain-based distributed EHR fine-grained traceability scheme [PDF]
, 2021 Aiming at the key management of electronic health records (EHR) in a distributed system and user identity tracing issues, a distributed EHR fine-grained traceability scheme based on blockchain was proposed.Combining chameleon hash and zero-knowledge ...
Jianfeng MA +3 more
core +1 more source
Blockchain-based access control mechanism for data traceability [PDF]
, 2020 To improve the transparency and traceability of access control, a blockchain-based access control mechanism for data traceability and provenance was proposed.The proposed access control policy was transferred to the smart contract and deployed on the ...
Guozhen SHI +5 more
core +1 more source
Vulnerability detection method for blockchain smart contracts based on metamorphic testing [PDF]
, 2023 Aimed at the defects of existing test methods, a vulnerability detection method for blockchain smart contracts based on metamorphic testing was proposed, which could generate test cases for specific functions in blockchain smart contracts to detect ...
Jinfu CHEN +6 more
core +1 more source