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A CPK-Based Identity Authentication Scheme for IoT

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Computer Systems Science & Engineering 2022年第3期40卷 1217-1231页

作者： Mingming Zhang Jiaming Mao Yuanyuan Ma Liangjie Xu Chuanjun Wang Ran Zhao Zhihao Li Lu Chen Wenbing Zhao State Grid Jiangsu Electric Power Co. Ltd.Information&Telecommunication BranchNanjing210008China State Grid Key Laboratory of Information&Network Security Institute of Information and CommunicationGlobal Energy Interconnection Research InstituteNanjing210003China Anhui Jiyuan Software Co.Ltd SGITGHefei230088China Engineering research Center of Post Big Data Technology and Application of Jiangsu Province Research and Development Center of Post Industry Technology of the State Posts Bureau(Internet of Things Technology)Engineering Research Center of Broadband Wireless Communication Technology of the Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing210003China Department of Electrical Engineering and Computer Science Cleveland State UniversityCleveland44115USA

As the power Internet of Things(IoT)enters the security construction stage,the massive use of perception layer devices urgently requires an identity authentication scheme that considers both security and *** existing public key infrastructure(PKI)-based security authentication scheme is currently difficult to apply in many terminals in *** key distribution and management costs are high,which hinders the development of power IoT security *** Public Key(CPK)technology uses a small number of seeds to generate unlimited public *** is very suitable for identity authentication in the power Internet of *** this paper,we propose a novel identity authentication scheme for power *** scheme combines the physical unclonable function(PUF)with improved CPK technology to achieve mutual identity authentication between power IoT terminals and *** proposed scheme does not require third-party authentication and improves the security of identity authentication for power ***,the scheme reduces the resource consumption of power IoT *** improved CPK algorithm solves the key collision problem,and the third party only needs to save the private key and the public key *** results show that the amount of storage resources occupied in our scheme is *** proposed scheme is more suitable for the power IoT.

关键词： Power Internet of Things terminal equipment identity authentication CPK PUF

mutual Inductance Calculation Between Arbitrarily Positioned Polygonal Coils

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Transactions of Nanjing University of Aeronautics and Astronautics 2022年第S1期39卷 120-126页

作者： ZHANG Zijian SHAO Ming SHANG Kai LI Xuekong HUANG Chunliang SHI Jinku CUI Huaxian DONG Yangyang College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China The 804th research institute of Shanghai Aerospace Technology research institute Shanghai 201100P.R.China The 41st research institute of CASIC Huhhot 010010P.R.China Huaneng Guangxi Clean Energy Co. Ltd.Nanning 530028P.R.China

Polygonal coil systems are designed for increasing and more kinds of sensors and electromagnetic *** paper presents a method for calculating mutual inductance between polygonal coils including irregular *** on the Biot-Savart law,the method calculates mutual inductance by dividing a polygonal coil into finite wires,and expresses the magnetic induction intensity generated by the excitation coil as a function of the spatial position of each vertex of the *** calculation method of the feasible region of the objective function is updated and the calculation process is simplified,so the calculation accuracy is *** octagon coils arbitrarily positioned in space,the accuracy of the algorithm is verified by the simulation and experiment.

关键词： mutual inductance polygonal coils Biot-Savart law arbitrary position

Visual abstraction of dynamic network via improved multi-class blue noise sampling

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Frontiers of Computer Science 2023年第1期17卷 171-185页

作者： Yanni PENG Xiaoping FAN Rong CHEN Ziyao YU Shi LIU Yunpeng CHEN Ying ZHAO Fangfang ZHOU School of Computer Science and Engineering Central South UniversityChangsha 410083China institute of Big Data Hunan University of Finance and EconomicsChangsha 410205China Rail Data research and Application Key Laboratory of Hunan Province Changsha 410083China

Massive sequence view (MSV) is a classic timeline-based dynamic network visualization approach. However, it is vulnerable to visual clutter caused by overlapping edges, thereby leading to unexpected misunderstanding of time-varying trends of network communications. This study presents a new edge sampling algorithm called edge-based multi-class blue noise (E-MCBN) to reduce visual clutter in MSV. Our main idea is inspired by the multi-class blue noise (MCBN) sampling algorithm, commonly used in multi-class scatterplot decluttering. First, we take a node pair as an edge class, which can be regarded as an analogy to classes in multi-class scatterplots. Second, we propose two indicators, namely, class overlap and inter-class conflict degrees, to measure the overlapping degree and mutual exclusion, respectively, between edge classes. These indicators help construct the foundation of migrating the MCBN sampling from multi-class scatterplots to dynamic network samplings. Finally, we propose three strategies to accelerate MCBN sampling and a partitioning strategy to preserve local high-density edges in the MSV. The result shows that our approach can effectively reduce visual clutters and improve the readability of MSV. Moreover, our approach can also overcome the disadvantages of the MCBN sampling (i.e., long-running and failure to preserve local high-density communication areas in MSV). This study is the first that introduces MCBN sampling into a dynamic network sampling.

关键词： dynamic network visualization massive sequence view multi-class blue noise sampling visual abstraction

The relationship between political connections and the mutual fund performance:Evidence from the US

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Economic and Political Studies 2023年第2期11卷 174-208页

作者： Zhengkai Liu Debao Hu Zheng He International College Renmin University of China(Suzhou Research Institute)SuzhouChina School of Economics and Management Shanghai Maritime UniversityShanghaiChina

This paper examines the effect of political connections between mutual fund managers and politicians on the fund *** the publicly available data of individual political donations,we regard the mutual funds as politically connected when their managers make financial contributions to ***,we show that aggregated stock holding changes of politically connected funds predict subsequent abnormal stock returns around the earnings announcement day,implying that the political connection promotes managers’stock picking *** evidence derived from the sample of entry buys and exit sells shows that politically connected funds outperform politically non-connected funds by 82 basis points ***,we provide evidence that earnings forecast accuracy for the firms whose stocks are held by politically connected funds is improved significantly when time is approaching the announcement date,highlighting the importance of political channels through which information flows between firms and the market are facilitated.

关键词： Political connection mutual fund information advantage earnings forecast

mutual influence of copper and paraquat on their adsorption in soil

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Pedosphere 2023年第6期33卷 857-864页

作者： Huanhua WANG Zhiguo PEI Guangcai CHEN Baoshan XING National Engineering Laboratory for Lake Pollution Control and Ecological Restoration Chinese Research Academy of Environmental SciencesBeijing 100012China State Environmental Protection Key Laboratory for Lake Pollution Control Chinese Research Academy of Environmental SciencesBeijing 100012China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China research institute of Subtropical Forestry Chinese Academy of ForestryHangzhou 311400China Stockbridge School of Agriculture University of MassachusettsAmherst MA 01003USA

Paraquat and copper (Cu) are commonly used and detected in ***,it is important to understand their mobility in the *** this study,the competitive effects of paraquat and Cu on their adsorption in five representative Chinese soils were investigated using batch adsorption equilibrium experiments and spectroscopic *** results showed that the adsorption of paraquat in soil varied with soil type and was positively correlated with both soil cation exchange capacity and organic matter *** exerted a more remarkable suppression effect on the adsorption of Cu than Cu on the adsorption of *** the presence of 0.12 and 0.19 mmol L-1paraquat,Cu adsorption decreased by 16%and 22%in Heilongjiang soil and by 24%and37%in Jiangxi soil,*** the presence of 0.1 and 0.2 mmol L-1Cu,paraquat adsorption decreased by 4%and 8%in Heilongjiang soil and by15%and 19%in Jiangxi soil,*** selectivity involving symmetric cation (paraquat2+and Cu2+) exchange is the probable basis for the suppression *** ultraviolet-visible absorption experiments suggested that the formation of Cu-paraquat complexes was unlikely to happen in a solution or at the soil *** K-edge X-ray absorption spectroscopy indicated that Cu in soil may have some water as hydration layers as the nearest neighbors,and each Cu atom was coordinated with five oxygen *** findings greatly improve our knowledge of the molecular-scale adsorption mechanisms of paraquat and Cu in soil and can be used to predict the behavior,transport,and fate of paraquat and Cu in agricultural soils.

关键词： cation exchange capacity competitive adsorption heavy metal herbicide organic contaminant soilorganic matter ultraviolet-visible absorption spectrophotometry X-ray absorption spectroscopy

China-ASEAN mutual Trust

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Contemporary World 2022年第3期 44-48页

作者： Luo Shengrong Belt and Road research institute as well as the institute of International Relations Yunnan University

The friendly relations between China and ASEAN have a long and enduring history. Both sides have deepened their allaround cooperation, making each other the largest trade partner, the most resilient partner, and the most meaningful strategic partner. Since the outbreak of the COVID-19 pandemic, the two sides have joined hands to fight the pandemic and overcome the difficulties side by side.

关键词： partner overcome meaningful

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Quantitative multi-phase-field modeling of non-isothermal solidification in hexagonal multicomponent alloys

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China Foundry 2022年第3期19卷 263-274页

作者： Yong-biao Wang Ming-guang Wei Xin-tian Liu Cong Chen Jian-xiu Liu Yu-juan Wu Shuai Dong Li-ming Peng Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment Zhengzhou University of Light IndustryZhengzhou 450002China National Engineering research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China Luoyang institute of Special Materials research Luoyang 471600HenanChina

A quantitative multi-phase-field model for non-isothermal and polycrystalline solidification was developed and applied to dilute multicomponent alloys with hexagonal close-packed *** effects of Lewis coefficient and undercooling on dendrite growth were investigated *** show that large Lewis coefficients facilitate the release of the latent heat,which can accelerate the dendrite growth while suppress the dendrite tip *** greater the initial undercooling,the stronger the driving force for dendrite growth,the faster the growth rate of dendrites,the higher the solid fraction,and the more serious the solute *** simulated dendrite growth dynamics are consistent with predictions from the phenomenological theory but significantly deviate from the classical JMAK theory which neglects the soft collision effect and mutual blocking among ***,taking the Mg-6Gd-2Zn(wt.%)alloy as an example,the simulated dendrite morphology shows good agreement with experimental results.

关键词： multi-phase-field model non-isothermal solidification polycrystalline multicomponent alloys dendrite growth microstructure

NIOSH提举指数在下背痛流行病学研究中的应用

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劳动医学 2004年第2期21卷 131-134页

作者：肖国兵雷玲 Patrick Dempsey 马藻骅梁友信复旦大学公共卫生学院美国利宝互助职业安全卫生研究中心 liberty mutual research Center for safety and Health HopkintonMA 01748USA 宁波市疾病预防控制中心

[目的 ]探讨美国国家职业安全卫生研究所提出的手工作业提举指数 (LI)与下背痛患病率的关系。[方法 ]在 3个具有典型提举作业的工厂中采用流行病学横断面调查方法 ,利用NIOSH提出的提举指数进行接触负荷评价 ,按照Nordic肌肉骨骼症状分... 详细信息

[目的 ]探讨美国国家职业安全卫生研究所提出的手工作业提举指数 (LI)与下背痛患病率的关系。[方法 ]在 3个具有典型提举作业的工厂中采用流行病学横断面调查方法 ,利用NIOSH提出的提举指数进行接触负荷评价 ,按照Nordic肌肉骨骼症状分析调查表对 491名从事手工提举作业的工人和 3 4名无明显提举任务的行政人员进行问卷调查 ,并对静态肌力进行测试。根据提举指数分为 0 ,～ 1,～ 2 ,～ 3 ,>3共 5组。观察各组工人不同部位肌肉骨骼疾患的患病情况 ,并分析提举指数与下背痛患病的关系。 [结果 ]在肌肉骨骼症状中 ,下背痛的发生率最高。当LI增高时 ,下背痛的OR值也随之增加 ,但其峰值出现在～ 3组 (OR =1.3 5 ) ,而LI >3 ,其OR值并非最高 ,仅为 1.3 0。平均腰拉力最大的为～ 1组 ( 95 .5 9± 2 1.76)kg ,而对照组和LI >3组则分别为 ( 80 .3 6± 14 .49)kg、( 86.85± 2 0 .3 3 )kg。 [结论 ]提举指数对手工提举所引起的下背痛是一个有意义的危险度评价指标。过度手工提举活动可能降低腰拉力。

关键词： NIOSH 下背痛流行病学肌肉骨骼疾患静态肌力

Cu_2GeS_3 derived ultrafine nanoparticles as high-performance anode for sodium ion battery

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Science China Materials 2018年第9期61卷 1177-1184页

作者： Lin Fu Chaoqun Shang Jun Ma Chuanjian Zhang Xiao Zang Jingchao Chai Jiedong Li Guanglei Cui Qingdao Industrial Energy Storage research institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China

Germanium based sulfides are potentially attractive as anode material for sodium ion batteries but rarely investigated. Herein, we firstly investigated Na^＋storage properties of pristine Cu2GeS3（PCGS） and found an effective strategy to improve its performance by a single lithiation/delithiation cycle obtaining ultrafine nanoparticle copper germanium sulfide（NCGS）. The lithiation/delithiation process leads to the formation of a stable Li-containing solid electrolyte interphase film and a significant improvement of sodiation kinetics. Therefore, the NCGS anode delivers favorable capacity retention and better rate capability compared with that of a PCGS whether in the half cell or in the full cell,showing great promise for energy storage application.

关键词： sodium ion battery nanoparticle copper germaniumsulfide anode material full cell