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Evolutionary privacy-preserving learning strategies for edge-based IoT data sharing schemes

数字通信与网络:英文版 2023年第4期9卷 906-919页

作者： Yizhou Shen Shigen Shen Qi Li haiping zhou Zongda Wu Youyang Qu Department of Computer Science and Engineering Shaoxing UniversityShaoxing312000China School of Computer Science and Informatics Cardiff UniversityCardiffCF243AAUnited Kingdom School of Information Engineering Huzhou UniversityHuzhou 313000ZhejiangChina School of Information Technology Deakin UniversityBurwoodVIC3125Australia

The fast proliferation of edge devices for the Internet of Things(IoT)has led to massive volumes of data explosion.The generated data is collected and shared using edge-based IoT structures at a considerably high frequency.Thus,the data-sharing privacy exposure issue is increasingly intimidating when IoT devices make malicious requests for filching sensitive information from a cloud storage system through edge nodes.To address the identified issue,we present evolutionary privacy preservation learning strategies for an edge computing-based IoT data sharing scheme.In particular,we introduce evolutionary game theory and construct a payoff matrix to symbolize intercommunication between IoT devices and edge nodes,where IoT devices and edge nodes are two parties of the game.IoT devices may make malicious requests to achieve their goals of stealing privacy.Accordingly,edge nodes should deny malicious IoT device requests to prevent IoT data from being disclosed.They dynamically adjust their own strategies according to the opponent's strategy and finally maximize the payoffs.Built upon a developed application framework to illustrate the concrete data sharing architecture,a novel algorithm is proposed that can derive the optimal evolutionary learning strategy.Furthermore,we numerically simulate evolutionarily stable strategies,and the final results experimentally verify the correctness of the IoT data sharing privacy preservation scheme.Therefore,the proposed model can effectively defeat malicious invasion and protect sensitive information from leaking when IoT data is shared.

关键词： Privacy preservation Internet of things Evolutionary game Data sharing Edge computing

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Influence of Selective Laser Melting Process Parameters on Microstructure and Properties of a Typical Ni-Based Superalloy

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Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1673-1687页

作者： Zhen Lu Chengcai Zhang Nana Deng haiping zhou Ruirui Fang Kuidong Gao Yukuo Su Hongbin Zhang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China Jier Machine-Tool Group Co.Ltd Jinan250022China

The influence of selective laser melting(SLM)process parameters on the microstructure and mechanical properties of a typical Ni-based superalloy was researched.The optimum parameters of P=170 W,V=0.8 m/s were determined,under which the SLMed samples exhibited both the largest relative density of 99.57%and the best mechanical properties,including the microhardness(329.3±3.8 HV),yield strength(726±8.1 MPa),ultimate tensile strength(900±5.9 MPa)and elongation((31.9±0.24)%).The average grain size ranges of SLMed samples are from 15.2 to 17.4μm,with a typical mixed grain structure.Owing to the high cooling rate and remelting during SLM process,a large number of low-angle grain boundaries(LAGBs),dislocations and sub-grains were formed,and the fraction of LAGBs reached above 65%.At the same time,the content of low-Σcoincidence site lattice(CSL)boundaries was mostly less than 1%,while there was almost noγ′phase precipitated in the matrix.The texture of SLMed samples was weak,and there was no obvious preferred growth direction.Combining with the microstructure characterization,both grain refinement strengthening and dislocation strengthening were considered as the main strengthening mechanisms.Moreover,the fracture mechanism of the optimum sample belonged to ductile fracture.

关键词： Selective laser melting Ni-based superalloy Relative density Microstructure Mechanical property

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Thermal Deformation Behavior and Processing Map of a Novel CrFeNiSi_(0.15)Medium Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2023年第11期36卷 1870-1882页

作者： Hongbin Zhang Kang Chen Zhongwei Wang haiping zhou Chengcheng Shi Shengxue Qin Jie Liu Tingjun Lv Jian Xu College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China School of Mechanical Engineering Shandong University of TechnologyZibo255000China Zibo Yuan Xu Metallurgical Machinery Co LtdZibo255120China

The thermal deformation behavior of a novel CrFeNiSi_(0.15)medium entropy alloy(MEA)was studied via isothermal compression experiments,with the processing parameter range of 900–1200℃and 0.001–1 s^(−1).According to experimental data,the modified constitutive equation had been obtained,which precisely predicted the flow behavior of CrFeNiSi_(0.15)MEA during thermal deformation.At the same time,the processing map was established on the basis of the dynamic material model(DMM)theory.According to the map,the optimal processing parameters were determined at 1130–1200℃/0.06–1 s−1,under which the power dissipation efficiency could reach above 34%.The peak efficiency was above 38%,which occurred at 1200℃/1 s^(−1).In such parameter,complete dynamic recrystallization(DRX)also occurred.The flow instability of CrFeNiSi_(0.15)MEA was estimated to occur at 900–985℃/0.12–1 s^(−1),which was shown as grain boundaries cracking.Furthermore,both the continuous DRX(CDRX)and discontinuous DRX(DDRX)occurred simultaneously during thermal deformation.Meanwhile,some twins were also newly formed during DRX process,most of which were primary twins.The occurrence of twinning was beneficial to promote the development of DRX behavior.

关键词： Medium entropy alloys Thermal deformation behavior Constitutive model Processing maps

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Co-doping strategy enhanced the ionic conductivity and excellent lithium stability of garnet-type Li_(7)La_(3)Zr_(2)O_(12)electrolyte in all solidstate lithium batteries

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Journal of Materiomics 2023年第4期9卷 651-660页

作者： Ziqiang Xu Xin Hu Bowen Fu Kashif Khan Jintian Wu Teng Li haiping zhou Zixuan Fang Mengqiang Wu School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu611731SichuanChina Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou313001ZhejiangChina School of Chemical Engineering Sichuan University of Science&EngineeringZigong643000China

Garnet-type Li_(7)La_(3)Zr_(2)O_(12)(LLZO)is one of the most promising solid-state electrolytes(SSEs).However,the application of LLZO is limited by structural instability,low ionic conductivity,and poor lithium stability.To obtain a garnet-type solid electrolyte with a stable structure and high ionic conductivity,a series of TaeCe co-doping cubic Li_(6.4)La_(3)Zr_(1.4-x)Ta_(0.6)Ce_(x)O_(12)(LLZTCO,x=,0.02,0.04,0.06,0.08,0.10,0.20,0.30)electrolytes were successfully synthesized through conventional solid-phase method.The Ta^(5+)doping can introduce more lithium vacancies and effectively maintain the stability of the cubic phase.The Ce^(4+)with a larger ionic radius is introduced into the lattice to widen the Lit migration bottleneck size,which significantly increased the ionic conductivity to 1.05×10^(-3)S/cm.It also shows excellent stability to lithium metal by the optimization of Lit transport channel.Li||LLZTCO||Li symmetric cells can cycle stably for more than 6000 h at a current density of 0.1 mA/cm^(2)without any surface modifications.The commercialization potential of LLZTCO samples in all solid-state lithium batteries(ASSLBs)is confirmed by the prepared LiFePO_(4)||LLZTCO||Li cells with a capacity retention rate of 98%after 100 cycles at 0.5C.This new co-doping method presents a practical solution for the realization of high-performance ASSLBs.

关键词： Solid-state electrolytes Garnet-type Co-doping Bottleneck size Ionic conductivity Lithium stability

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Caltrans use of scrap tires in asphalt rubber products:a comprehensive review

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Journal of Traffic and Transportation Engineering(English Edition) 2014年第1期1卷 39-48页

作者： haiping zhou Sri Holikatti Peter Vacura California Department of Transportation SacramentoCaliforniaUSA

The California Department of Transportation （Caltrans） has been using scrap tire rubber in asphalt pavements since the 1970s in chip seals and the 1980s in rubberized hot mix asphalt（RHMA）. Both the wet （field blend） and dry processes were used in early trials. Caltrans has also used rubber modified binders containing both crumb rubber modifier and polymer modifier that could be manufactured at a refinery facility, a terminal blend wet process. Since the beginning of this century, Caltrans increased the use of scrap tire rubber in paving projects and invested considerable resources in developing technically sound, cost effective, and environmentally friendly strategies for using scrap tire rubber in roadway applications. By the end of year 2010, approximately 31% of all hot mix asphalt （HMA） placed by Caltrans was rubberized HMA, roughly 1.2 million tons. Caltrans efforts in using asphalt rubber products were also demonstrated in its research and technology development. These included the construction of two full-scale field experiments, five warranty projects, and an accelerated pavement study using a heavy vehicle simulator. Additionally, terminal blend asphalt rubber and rubberized warm mix asphalts began to be experimented on trial basis. This paper provides a comprehensive review of Caltrans experience over four decades with asphalt rubber products. Current practices and future outlook are also discussed.

关键词： asphalt rubber rubberized asphalt concrete rubberized hot mix asphalt rubber modified binder rubber modified asphalt concrete

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硅酮粉改性超高分子量聚乙烯及其熔体纺丝加工性能

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工程塑料应用 2024年第3期52卷 28-32页

作者：刘杰高阳秦升学张弘斌周海萍山东科技大学机械电子工程学院山东青岛266590

针对超高分子量聚乙烯(PE-UHMW)熔体加工性能差的问题,应用硅酮粉,采用熔融共混方法对PE-UHMW进行改性,以提高其熔体加工时的流动性。通过扫描电子显微镜与能量色散谱(EDS)表征了硅酮粉在PE-UHMW中的分布,并采用熔体速率测试、旋转流变... 详细信息

针对超高分子量聚乙烯(PE-UHMW)熔体加工性能差的问题,应用硅酮粉,采用熔融共混方法对PE-UHMW进行改性,以提高其熔体加工时的流动性。通过扫描电子显微镜与能量色散谱(EDS)表征了硅酮粉在PE-UHMW中的分布,并采用熔体速率测试、旋转流变测试,分析了硅酮粉含量对PE-UHMW熔体流动速率与流变性能的影响。对改性后的PE-UHMW采用熔体纺丝法制备了PE-UHMW单丝,并进行了拉伸强度测试。实验结果表明,随着硅酮粉的增加,其分散性逐渐变差,PE-UHMW熔体流动速率随硅酮粉含量先增加后降低,当硅酮粉质量分数达到4%,其熔体流动速率最高,复数黏度与储能模量最低,5%质量分数的硅酮粉在PE-UHMW基体中团聚较明显,改性后的PE-UHMW熔体流动性降低。熔体纺丝实验结果表明改性后的PE-UHMW可以通过普通单螺杆挤出机熔融挤出初生丝,经超倍热拉伸可以制备高强度单丝。当拉伸倍率为36时,质量分数3%的硅酮粉改性PE-UHMW单丝拉伸强度最高,可达1565MPa。因此综合考虑加工性能与单丝强度,采用质量分数3%的硅酮粉改性PE-UHMW较合适。

关键词：超高分子量聚乙烯硅酮粉熔融共混熔体纺丝拉伸强度

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Susceptible-Infected-Recovered-Susceptible Virus Spreading Model Based on Two Dimensional Sparse Lattice

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Journal of Life Sciences 2011年第6期5卷 443-446页

作者： haiping zhou Shaohong Cai Department of Computer Science Guiyang College Guiyang Guizhou 550005 China Guizhou Economy and Finace College Guiyang Guizhou 550004 China

In order to clarify the virus’ spreading rules, a SIRS (Susceptible-Infected-Recovered-Susceptible) disease spread model based on sparsely distributed crowd is proposed. In this model, the effects of crowd-density, spread efficiency and the moving of individuals on the spreading of viruses are researched. The theoretical analysis and analog simulation shows that there exist a critical value, only when the product of spread efficiency and crowd density goes beyond the critical value, can viruses spread in crowd continuously and steadily. Besides, the moving of individuals can promote the spreading of viruses. These results are helpful guiding people to defense and control virus’ spreading process.

关键词：病毒传播模型敏感感染人群密度稀疏二维模拟仿真传播过程

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Modulation of the electronic states of perovskite SrCrO3 thin films through protonation via low-energy hydrogen plasma implantation approaches

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Frontiers of physics 2020年第1期15卷 43-50页

作者： Meng Wu Shanquan Chen Chuanwei Huang Xing Ye haiping zhou Xiaochun Huang Kelvin H.L.Zhang Wensheng Yan Lihua Zhang Kisslinger Kim Yingge Du Scott Chambers Jin-Cheng Zheng Hui-Qiong Wang Fujian Provincial Key Laboratory of Semiconductors and Applications Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesDepartment of PhysicsXiamen UniversityXiamen 361005China Shenzhen Key Laboratory of Special Functional Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNY 11973-5000USA Physical Sciences Division Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichlandWA 99352USA

Hydrogenation of transition metal oxides offers a powerful platform to tailor physical functionalities as well as for potential applications in modern electronic technologies.An ideal nondestructive and efficient hydrogen incorporation approach is important for the realistic technological applications.We demonstrate the proton injection on SrCro3 thin films via an efficient low-energy hydrogen plasma implantation experiments,without destroying the original lattice framework.Hydrogen ions accumu-late largely at the interfacial regions with amorphous character which extend about one-third of the total thickness.The Hx.SrCro3(HSCO)thin films appear like exfoliated layers which however retain the fully strained state with distorted perovskite structure.Proton doping induces the change of Cr oxidation state from Cr^4+to Cr^3+in HSCO thin films and a transition from metallic to insulat-ing phase.Our investigations suggest an attractive platform in manipulating the electronic phases in proton-based approaches and may offer a potential peeling off strategy for nanoscale devices through low-energy hydrogen plasma implantation approaches.

关键词： transition metal oxide thin film metal-insulator transition hydrogenation

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基于模型预测的脱硫浆液循环泵运行组合优化研究

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上海节能 2024年第5期 831-838页

作者：尚志强周海平蒋波尹贵豪国能锦界能源有限责任公司上海鉴智软件技术有限公司

浆液循环泵的优化组合运行对于脱硫装置的经济运行具有重要影响,在当前机组负荷工况波动大、净烟气SO_(2)浓度排放限制严格的情况下,依靠运行人员的经验手动调节达到经济运行有较大的困难。针对这一现状,基于FIR模型辨识方法,建立了脱... 详细信息

浆液循环泵的优化组合运行对于脱硫装置的经济运行具有重要影响,在当前机组负荷工况波动大、净烟气SO_(2)浓度排放限制严格的情况下,依靠运行人员的经验手动调节达到经济运行有较大的困难。针对这一现状,基于FIR模型辨识方法,建立了脱硫装置的数据驱动预测模型,并结合专家知识及现场设备限制研发了循环泵组合在线优化建议系统,在保障脱硫装置安全、达标运行的前提下实现优化经济运行。实际生产应用结果表明,该系统投运后可降低20.5%的浆液成本和3.7%的电耗成本,对于火电厂节能减排及智能化改造工作具有参考意义。

关键词：湿法脱硫浆液循环泵有限脉冲响应模型预测运行优化

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三伏贴治疗儿童常年性变应性鼻炎长期随访研究思路探讨

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光明中医 2024年第1期39卷 19-22页

作者：周海平廖凯李军周小红张政项洁徐玲玲熊俊江西中医药大学附属医院针灸过敏性鼻炎科江西南昌330000 江西中医药大学针灸推拿学院江西南昌330004

目的严谨科学地设计三伏贴治疗儿童常年性变应性鼻炎(PAR)为长期随访临床研究方案。方法结合儿童PAR疾病特点,在循证医学视野下,从样本含量、随机分配方法、对照研究、干预措施、结局指标及疗效评价等方面综合阐述三伏贴疗法治疗儿童PA... 详细信息

目的严谨科学地设计三伏贴治疗儿童常年性变应性鼻炎(PAR)为长期随访临床研究方案。方法结合儿童PAR疾病特点,在循证医学视野下,从样本含量、随机分配方法、对照研究、干预措施、结局指标及疗效评价等方面综合阐述三伏贴疗法治疗儿童PAR的临床试验设计思路与实施方案。结果延长三伏贴治疗儿童PAR的随访时间,有助于评估三伏贴疗法的远期疗效。结论通过平行随机对照研究方法,设计试验方案,是评价三伏贴干预儿童PAR远期疗效的重要基础。

关键词：鼻鼽变应性鼻炎三伏贴疗法儿科学研究思路

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