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On Designs of Decentralized Reputation Management for Permissioned Blockchain Networks

Computer Modeling in Engineering & Sciences 2024年第5期139卷 1755-1773页

作者： Jinyu Chen Long Shi Qisheng Huang taotao wang Daojing He School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing210094China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518055China College of Electronics and Information Engineering Shenzhen UniversityShenzhen518060China School of Computer Science and Technology Harbin Institute of TechnologyShenzhen518055China

In permissioned blockchain networks,the Proof of Authority(PoA)consensus,which uses the election of authorized nodes to validate transactions and blocks,has beenwidely advocated thanks to its high transaction throughput and fault ***,PoA suffers from the drawback of centralization dominated by a limited number of authorized nodes and the lack of anonymity due to the round-robin block proposal *** a result,traditional PoA is vulnerable to a single point of failure that compromises the security of the blockchain *** address these issues,we propose a novel decentralized reputation management mechanism for permissioned blockchain networks to enhance security,promote liveness,and mitigate centralization while retaining the same throughput as traditional *** paper aims to design an off-chain reputation evaluation and an on-chain reputation-aided ***,we evaluate the nodes’reputation in the context of the blockchain networks and make the reputation globally verifiable through smart ***,building upon traditional PoA,we propose a reputation-aided PoA(rPoA)consensus to enhance securitywithout sacrificing *** particular,rPoA can incentivize nodes to autonomously form committees based on reputation authority,which prevents block generation from being tracked through the randomness of reputation ***,we develop a reputation-aided fork-choice rule for rPoA to promote the network’s ***,experimental results show that the proposed rPoA achieves higher security performance while retaining transaction throughput compared to traditional PoA.

关键词： Blockchain reputation management PoA throughput security decentralization

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High-quality assembled and annotated genomes of Nicotiana tabacum and Nicotiana benthamiana reveal chromosome evolution and changes in defense arsenals

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Molecular Plant 2024年第3期17卷 423-437页

作者： Jubin wang Qingling Zhang Jeffrey Tung Xi Zhang Dan Liu Yingtian Deng Zhendong Tian Huilan Chen taotao wang Weixiao Yin Bo Lij Zhibing Lai Savithramma P.Dinesh-Kumar Barbara Baker Feng Li National Key Laboratory for Germplasm Innovation and Utilization for Fruit and Vegetable Horticultural Crops College of Horticulture and Forestry SciencesHuazhong Agricultural UniversityWuhanHubei 430070China Plant Gene Expression Center Department of Plant and Microbial BiologyUniversity of CaliforniaBerkeleyBerkeleyCA 94706USA College of Plant Science and Technology Huazhong Agricultural UniversityWuhanHubei 430070China College of Life Science and Technology Huazhong Agricultural UniversityWuhanHubei 430070China Department of Plant Biology and The Genome Center College of Biological SciencesUniversity of CalforniaDavisDavisCA 95616USA The Key Laboratory of Horticultural Plant Genetic and Improvement of Jiangxi Province Institute of Biological ResourcesJiangxi Academy of SciencesNanchang 330299China institute of Vegetables and Flowers Jiangxi Academy of Agricultural SciencesNanchang 330200Chin Hubei Hongshan Laboratory WuhanHubei 430070China

Nicotiana tabacum and Nicotiana benthamiana are widely used models in plant biology ***,genomic studies of these species have *** we report the chromosome-level reference genome assemblies for *** and *** with an estimated 99.5%and 99.8%completeness,*** transcription start and termination site sequencing methods were developed and used for accurate gene annotation in *** analyses revealed evidence for the parental origins and chromosome structural changes,leading to hybrid genome formation of each ***,theantiviral silencinggenesRDR1,RDR6,DCL2,DCL3,andAGO2were lost from one or both subgenomes in ***,while both homeologs were kept in ***,the *** genome encodes fewer immune receptors and signaling components than that of *** find-ings uncover possible reasons underlying the hypersusceptible nature of *** developed the user-friendly Nicomics(http:/***/Nicomics/)web server to facilitate better use of Nicotiana genomic resources as well as gene structure and expression analyses.

关键词： Nicotiana tabacum Nicotiana benthamiana genomics evolution disease resistance NLR

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Optimization of High-Concurrency Conflict Issues in Execute-Order-Validate Blockchain

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ZTE Communications 2024年第2期22卷 19-29页

作者： MA Qianli ZHANG Shengli wang taotao YANG Qing wang Jigang Shenzhen University Shenzhen 518000China ZTE Corporation Shenzhen 518057China

With the maturation and advancement of blockchain technology,a novel execute-order-validate(EOV)architecture has been proposed,allowing transactions to be executed in parallel during the execution ***,parallel execution may lead to multi-version concurrency control(MVCC)conflicts during the validation phase,resulting in transaction *** on different causes,we categorize conflicts in the EOV blockchain into two types:within-block conflicts and cross-block conflicts,and propose an optimization solution called FabricMan based on Fabric *** within-block conflicts,a reordering algorithm is designed to improve the transaction success rate and parallel validation is implemented based on the transaction conflict *** also merge transfer transactions to prevent triggering multiple version *** cross-block conflicts,a cache-based version validation mechanism is implemented to detect and terminate invalid transactions in *** comparisons are conducted between FabricMan and two other systems,Fabric and Fabric++.The results show that FabricMan outperforms the other two systems in terms of throughput,transaction abort rate,algorithm execution time,and other experimental metrics.

关键词： blockchain MVCC conflict reordering parallel validation transaction merging

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职业院校技能大赛教学能力比赛(专业组)高职获奖作品选题的特征、趋势分析与启示——基于2019—2022年国家级获奖作品的NVivo分析

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中国职业技术教育 2024年第2期 34-45页

作者：王涛涛广东机电职业技术学院广州大学广东技术师范大学

职业院校技能大赛教学能力比赛奖(专业组)高职获奖作品是高职院校教师教学能力的集中体现,对高职教育教学改革和发展具有重要意义。基于2019—2022年国家级获奖作品选题的NVivo分析,通过对作品选题的词频、编码和分类,归纳出作品选题聚... 详细信息

职业院校技能大赛教学能力比赛奖(专业组)高职获奖作品是高职院校教师教学能力的集中体现,对高职教育教学改革和发展具有重要意义。基于2019—2022年国家级获奖作品选题的NVivo分析,通过对作品选题的词频、编码和分类,归纳出作品选题聚焦于数字化与智能化等社会经济发展的热点问题,强调教学内容的应用性与实践性,并呈现出多学科融合的发展趋势,为教学内容的改革提供启示,并对未来教学比赛选题给出建议。

关键词：高职院校教学能力比赛选题特征 NVivo 启示

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高质量高职专业课课堂教学不足现状特征与优化策略研究——基于2021年68个全国职业院校技能大赛教学能力比赛教学实施汇报获奖视频的NVivo分析

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中国职业技术教育 2024年第14期 44-53页

作者：王涛涛广东机电职业技术学院广州大学广东技术师范大学

为探究目前高职专业课课堂教学存在的主要问题,并提出相应的优化对策,对2021年68个全国职业院校技能大赛教学能力比赛二等奖以上获奖作品的高职教学实施汇报获奖视频中的教学反思进行NVivo分析。目前,高职专业课课堂教学存在教学资源有... 详细信息

为探究目前高职专业课课堂教学存在的主要问题,并提出相应的优化对策,对2021年68个全国职业院校技能大赛教学能力比赛二等奖以上获奖作品的高职教学实施汇报获奖视频中的教学反思进行NVivo分析。目前,高职专业课课堂教学存在教学资源有待完善、学生素养有待提升、教学评价有待改进、数据处理有待优化和校企合作融入不足等主要问题。通过推进教学资源建设共享、加强校企合作深度广度、教学评价体系持续完善、强化数据采集共享处理以及学生分类分层分组教学等主要措施开展课堂教学改进。

关键词：职业教育专业课课堂教学不足特征优化策略

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基于神经网络的地铁列车速度传感器自动化诊断

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电子设计工程 2024年第10期32卷 92-96页

作者：王桃桃西安工商学院设计与创意学院陕西西安710032

基于列车运行稳定可靠的需求,提高传感器数据检测的准确性以及及时性的目的,采用以径向神经网络为基础依据,进行双通道传感器数据检测的自动化故障诊断方法,构建地铁列车速度传感器自动化诊断系统。以传感器的工作原理为依据设置两组检... 详细信息

基于列车运行稳定可靠的需求,提高传感器数据检测的准确性以及及时性的目的,采用以径向神经网络为基础依据,进行双通道传感器数据检测的自动化故障诊断方法,构建地铁列车速度传感器自动化诊断系统。以传感器的工作原理为依据设置两组检测通道,其中一组作为备用通道进行信号检测。同时结合径向神经网络构建速度传感器自动诊断系统,经过精确度阈值以及相角对传感器故障进行诊断。通过实际的验证试验可知,传感器自动化诊断系统能够保证较高的精确度,可对地铁列车速度传感器的工作状态进行及时有效的判断。

关键词：径向神经网络传感器 RBF核函数精确度阈值

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纳米晶NiTi形状记忆合金/Nb纳米线复合材料超弹应力的温度依赖性

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中国有色金属学报 2024年第3期34卷 835-840页

作者：王涛涛武泽园李亚鹏廖仲尼王永善刘艳唐玲陕西理工大学材料科学与工程学院汉中723003

NiTi形状记忆合金因其超弹性已经得到广泛应用,然而传统NiTi合金马氏体相变的超弹应力随温度的降低而快速减小(6~7 MPa/K),显著制约了其在宽温域中的应用。本文通过熔炼、锻造及拔丝获得纳米晶NiTi/Nb丝材,然后采用透射电子显微镜、差... 详细信息

NiTi形状记忆合金因其超弹性已经得到广泛应用,然而传统NiTi合金马氏体相变的超弹应力随温度的降低而快速减小(6~7 MPa/K),显著制约了其在宽温域中的应用。本文通过熔炼、锻造及拔丝获得纳米晶NiTi/Nb丝材,然后采用透射电子显微镜、差示扫描量热仪及拉伸试验机分别研究丝材的显微组织、相变行为及超弹性能。结果表明:纳米晶NiTi/Nb丝材中NiTi合金的平均晶粒尺寸为14 nm,丝材在降温和升温过程中分别发生热诱发B2→R相变和R→B2相变。在328~376 K温度范围内,纳米晶NiTi/Nb丝材应力诱发B2→B19′相变超弹应力的平均值为1002 MPa,超弹应力的温度依赖性为4.1 MPa/K。

关键词：纳米晶 NiTi形状记忆合金 Nb纳米线超弹应力温度依赖性

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锆基非晶合金与传统合金在海水中的耐腐蚀性能对比研究

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中国腐蚀与防护学报 2024年第4期44卷 949-956页

作者：马晓伟薛荣洁王涛涛杨亮刘珍光江苏理工学院材料工程学院常州213001 江苏科技大学材料科学与工程学院镇江212100

采用X射线衍射仪(XRD)和差示量热扫描分析仪(DSC)对锆基非晶合金进行结构和热力学性能表征;采用动电位极化曲线及电化学阻抗谱研究锆基非晶合金和传统金属合金(304不锈钢、6082铝合金)在3.5%NaCl溶液和模拟海水溶液中的电化学行为;采用... 详细信息

采用X射线衍射仪(XRD)和差示量热扫描分析仪(DSC)对锆基非晶合金进行结构和热力学性能表征;采用动电位极化曲线及电化学阻抗谱研究锆基非晶合金和传统金属合金(304不锈钢、6082铝合金)在3.5%NaCl溶液和模拟海水溶液中的电化学行为;采用扫描电镜(SEM)观察腐蚀后试样的表面形貌,并利用能谱仪(EDS)分析非晶合金腐蚀后表面元素的变化。结果表明:4种金属合金在腐蚀溶液中均发生点蚀现象,非晶合金表现出更加优异的耐腐蚀性能。相较于在3.5%NaCl溶液中的极化曲线,非晶合金和传统合金在模拟海水溶液中的极化曲线均发生负移,归因于海水中溶有大量的氯化物和硫酸盐。相较于传统合金,非晶合金表面形成的钝化膜表现的更加稳定。

关键词：非晶合金电化学模拟海水耐腐蚀性

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Modeling of gas porosity and microstructure formation during dendritic and eutectic solidification of ternary Al-Si-Mg alloys

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Journal of Materials Science & Technology 2021年第17期76卷 76-85页

作者： Mengdan Hu taotao wang Hui Fang Mingfang Zhu Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing211189China

A two-dimensional(2-D)multi-component and multi-phase cellular automaton(CA)model coupled with the Calphad method and finite difference method(FDM)is proposed to simulate the gas pore formation and microstructures in solidification process of hypoeutectic Al-Si-Mg *** this model,the pore growth,and dendritic and eutectic solidification are simulated using a CA *** achieve the equilibrium among multiple phases during ternary Al-based alloy solidification,the phase transition thermodynamics and kinetics are evaluated by adopting the Calphad *** diffusion equations of hydrogen and two solutes are solved by *** developed CA-FDM coupled model can be used for simulating the evolution of gas microporosity and microstructures,involving dendrites and irregular binary and ternary eutectics,of ternary hypoeutectic Al-Si-Mg *** has the capability of reproducing the interactions between the hydrogen microporosity formation and the growth of dendrites and eutectics,the competitive growth among the growing gas pores of different sizes,together with the time-evolving concentration fields of hydrogen and *** simulated morphology of gas pore and microstructure has a good agreement with the experimental *** influences of the initial hydrogen concentration and cooling rate on the microporosity formation are *** is found that the main portion of porosity formation occurs in the eutectic solidification stage through analyzing the profiles of porosity percentage and solid fraction varying with solidification *** varying features of simulated porosity percentage,the maximum and average pores radii indicate that increasing initial hydrogen concentration promotes the formation of higher final porosity percentage and larger pores,while the size of gas pores will significantly reduce with increasing cooling rate,leading to a lower final porosity percentage.

关键词： Porosity Solidification microstructures Ternary Al-Si based alloys Diffusion Cellular automaton

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Decision-feedback multiple symbol detection for differential space-time block coded UWB systems

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Science China(Information Sciences) 2013年第4期56卷 50-59页

作者： LV TieJun wang taotao GAO Hui Key Laboratory of Trustworthy Distributed Computing and Service Ministry of EducationBeijing University of Posts and Telecommunications Department of Information Engineering The Chinese University of Hong Kong

The symbol-by-symbol differential detection scheme,originally employed to detect differential spacetime block coded(DSTBC) ultra-wideband(UWB) signal in previous work,su?ers from a performance degradation compared with coherent *** this paper,a noncoherent multiple symbol detection(MSD) scheme is proposed to enhance the performance of DSTBC-UWB *** the signal model of DSTBC-UWB is analyzed,the optimal maximum likelihood(ML) MSD is derived and then a suboptimal ML-MSD is obtained by channel ***,exhaustive search based MSD is impractical in DSTBC-UWB systems since its complexity increases exponentially with observation window *** decrease the computational complexity,the decision-feedback(DF) scheme is introduced to *** resultant DF-MSD yields reasonable complexity and solid performance improvement.

关键词： ultra-wideband(UWB) space-time block code(STBC) differential detection multiple symbol detection(MSD)

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