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An ultralight,flexible,and biocompatible all-fiber motion sensor for artificial intelligence wearable electronics

npj Flexible Electronics 2022年第1期6卷 235-242页

作者： Sen lin Shuang Hu Wei Song Miaoqing Gu Junchen liu Jianan Song Zhenglian liu Ziwei li Kun Huang Yufeng wu Ming Lei hui wu School of Physical Science and Technology Guangxi UniversityNanning 530004China Advanced institute for Brain and Intelligence Guangxi UniversityNanning 530004China state key laboratory of information Photonics and Optical Communications and School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China state key laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

New-generation human body motion sensors for wearable electronics and intelligent medicine are required to comply with stringent requirements in terms of ultralight weight,flexibility,stability,biocompatibility,and extreme ***,conventional sensors are hard to fulfill all these criteria due to their rigid structure,high-density sensing materials used as the constituents,as well as hermetical and compact assembly ***,we report an ultralight sensing material based on radial anisotropic porous silver fiber(RAPSF),which has been manufactured by phase separation and temperature-controlled grain growth strategy on a modified blow-spinning *** resistance of RAPSF could be dynamically adjusted depending on the deflected ***,an all-fiber motion sensor(AFMS)with an ultra-low density of 68.70 mg cm^(−3) and an overall weigh of 7.95 mg was fabricated via layer-by-layer *** sensor exhibited outstanding flexibility,breathability,biocompatibility,and remarkable body motion recognition ***,the AFMS was shown to have great potential as an artificial intelligence throat sensor for throat state identification at the accuracy above 85%,allowing one to spot the early onset of the viral throat illness.

关键词： fiber artificial motion

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Room-temperature production of silver-nanofiber film for large-area, transparent and flexible surface electromagnetic interference shielding

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npj Flexible Electronics 2019年第1期3卷 56-63页

作者： Sen lin Haiyang Wang Fan wu Qingmin Wang Xiaopeng Bai Di Zu Jianan Song Dong Wang Zhenglian liu Ziwei li Nian Tao Kai Huang Ming Lei Bo li hui wu state key laboratory of information Photonics and Optical Communications and School of Science Beijing University of Posts and Telecommunications100876 BeijingChina state key laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University100084 BeijingChina Advanced Materials institute Shenzhen Graduate SchoolTsinghua University518055 ShenzhenChina School of Mechanical Engineering Nanjing University of Science&Technology210094 NanjingChina

A kind of pollution known as electromagnetic interference(EMI),which results from ubiquitous usage of various electronic communication and military radar equipment,has been receiving increasing attention ***,large-area EMI shielding on transparent and/or curved surfaces,including building windows,curved glass wall,and special requirements spaces(SRSs),remains hard to *** this paper,a silver nanofiber(AgNF)based flexible and transparent EMI shielding film was successfully assembled via a room-temperature roll-to-roll production *** transparent application scenario,AgNF with 89%transmittance in visible range and 1μm thickness shows~20 dB shielding efficiency(EMI SE).On the other hand,total shielding(>50 dB)is obtained when the thickness of AgNF increases to 10μm,while its transmittance in visible range remains higher than 75%.Considering the facile and scale-free production technology,this material can be readily applied in large-scale,transparent,and/or SRSs EMI shielding.

关键词： transparent silver film

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FATOC:Bug Isolation Based Multi-Fault Localization by Using OPTICS Clustering

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Journal of Computer Science & Technology 2020年第5期35卷 979-998页

作者： Yong-Hao wu Zheng li Yong liu Xiang Chen College of information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China School of information Science and Technology Nantong UniversityNantong 226019China state key laboratory of information security.institute of information Engineering Chinese Academy of Sciences Beijing 100093China

Bug isolation is a popular approach for multi-fault localization(MFL),where all failed test cases are clustered into several groups,and then the failed test cases in each group combined with all passed test cases are used to localize only a single ***,existing clustering algorithms cannot always obtain completely correct clustering results,which is a potential threat for bug isolation based MFL *** address this issue,we first analyze the influence of the accuracy of the clustering on the performance of MFL,and the results of a controlled study indicate that using the clustering algorithm with the highest accuracy can achieve the best performance of ***,previous studies on clustering algorithms also show that the elements in a higher density cluster have a higher *** on the above motivation,we propose a novel approach FATOC(One-Fault-at-a-Time via OPTICS Clustering).In particular,FATOC first leverages the OPTICS(Ordering Points to Identify the Clustering Structure)clustering algorithm to group failed test cases,and then identifies a cluster with the highest *** clustering is a density-based clustering algorithm,which can reduce the misgrouping and calculate a density value for each *** a density value of each cluster is helpful for finding a cluster with the highest clustering *** then combines the failed test cases in this cluster with all passed test cases to localize a single-fault through the traditional spectrum-based fault localization(SBFL)*** this fault is localized and fixed,FATOC will use the same method to localize the next single-fault,until all the test cases are *** evaluation results show that FATOC can significantly outperform the traditional SBFL technique and a state-of-the-art MFL approach MSeer on 804 multi-faulty versions from nine real-world ***,FATOC’s performance is 10.32%higher than that of traditional SBFL when using Ochiai formul

关键词： bug isolation multiple-fault localization ordering points to identify the clustering structure(OPTICS)clustering empirical study

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降阶技术与监测点数据融合驱动的油浸式变压器绕组瞬态温升快速计算方法

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电工技术学报 2024年第19期39卷 6162-6174页

作者：刘刚胡万君刘云鹏武卫革李琳河北省输变电设备安全防御重点实验室(华北电力大学) 保定071003 华北电力大学新能源电力系统国家重点实验室北京102206 河北省输变电装备电磁与结构性能重点实验室(保定天威保变电气股份有限公司) 保定071056

为了提高油浸式电力变压器绕组瞬态温升的计算效率,提出了一种基于离散监测点的温度场降阶计算方法。该方法以绕组内部若干离散监测点的温度信息为输入,以基于本征正交分解的降阶算法为载体,建立瞬态过程中温度场的快速反演模型,从而实... 详细信息

为了提高油浸式电力变压器绕组瞬态温升的计算效率,提出了一种基于离散监测点的温度场降阶计算方法。该方法以绕组内部若干离散监测点的温度信息为输入,以基于本征正交分解的降阶算法为载体,建立瞬态过程中温度场的快速反演模型,从而实现从监测点数据到温度场全域的快速计算。首先分析了本征正交分解算法的降阶特性,在此基础上建立了从场域内离散监测点数据到降阶模态,再到温度场全域的快速计算策略。为了验证算法的有效性,该文根据油浸式电力变压器绕组结构特点建立二维八分区分匝绕组传热模型,并对比了所提出的降阶计算方法与全阶计算方法的精度和效率,结果表明,二者的最大平均计算偏差仅为1.03 K,摄氏温标下温升的最大平均相对误差不超过5%,且降阶计算时间仅为0.18 s,相较于全阶计算获得了较高的效率提升。最后,依靠110 kV油浸式变压器绕组温升试验平台,通过测量绕组实际的温升情况,对算法的性能进一步验证,相关结果表明所提算法各时刻的计算结果与测量结果相比最大误差不超过4.67 K,且各测量线饼的平均误差不超过1.02 K,在工程上属于可接受的范围。同时,所提算法对绕组瞬态温升全过程的计算时间仅为3.40s,初步实现了实际工程场景下对于绕组瞬态温升快速计算的要求。

关键词：油浸式电力变压器本征正交分解离散监测点快速计算方法

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C-V2X Equipment Identification Management and Authentication Mechanism

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china Communications 2021年第8期18卷 297-306页

作者： Shanzhi Chen Qiang li Yong Wang hui Xu Xiaoyong Jia state key laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China state key laboratory of Wireless Mobile Communication China Information Communication Technologies Group CorporationBeijing 100191China Datang Microelectronics Technology Co. LtdBeijing 100094China

Cellular vehicle-to-everything(C-V2X)is the most promising V2X communication technology which can greatly improve traffic efficiency and road ***,when vehicles are interconnected with the surrounding radio environment,the CV2X system will face various network security risks and threats,significantly impacting on traffic and life *** paper proposes a novel unified identification management framework and security authentication mechanism for the C-V2X equipment based on the security problems analyses of the C-V2X system and the existing security protection *** paper also presents the security analysis and evaluation for the unified identification management and authentication mechanism.A experiment system is implemented to verify feasibility and effectiveness for the proposed mechanism.

关键词： C-V2X identification management authentication

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Mineralogy, Petrology and Geochemistry of Peridotites from the Northern Ophiolititc Sub-belt, Western Yarlung Zangbo Suture Zone, Tibet

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 44-46页

作者： liAN Dongyang YANG Jingsui liU Fei DING Yi wu Weiwei ZHAO hui ZHANG li HUANG Jian Faculty of Earth sciences China University of Geosciences Wuhan 430074 China CARMA State Key Laboratory for Continental Tectonics and Dynamics Institute of Geology Chinese Academy ofGeological Sciences Beijing 100037 China School of Earth Science and Mineral Resources China University of Geosciences Beijing 100083 China

Ophiolites, mostly found in orogenic belts, represent fragments of palaeo-oceanic lithosphere emplaced on the continent through tectonic processes （Bizimis et al., 2000; Dilek and Fumes, 2011, 2014; Pearce, 2014）. T... 详细信息

关键词： Peridotite Ophiolites Mineralogy Petrology Geochemistry

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Differential Fault Analysis on 3DES Middle Rounds Based on Error Propagation

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chinese Journal of Electronics 2022年第1期31卷 68-78页

作者： MA Xiangliang ZHANG lizhen wu liji li Xia ZHANG Xiangmin li Bing liU Yuling School of Integrated Circuits Tsinghua University Beijing National Research Center for Information Science and Technology National Research Center for information Technology security institute of information Engineering Chinese Academy of Sciences School of Cyber security University of Chinese Academy of Sciences

Since differential fault analysis(DFA)was first implemented on data encryption standard(DES), many scholars have improved this attack and extended the limit of the original last two rounds to the earlier rounds. However, the performance of the novel attacks which target middle rounds is not effective, i.e. the number of correct/incorrect ciphertexts required is very large and the recovered result maybe not correct. We address this problem by presenting new DFA methods that can break 3 DES when injecting faults at round 12 or *** simulating the process of single-bit error propagation,we have built two kinds of error propagation models as well as an intermediate error propagation state *** we simplify the intermediate states into state templates that will be further used to locate the injected fault position, which is the main difficulty of implementing fault injection in the middle rounds. Finally, in terms of the idea of error propagation and probability theory, we can recover the last round key only using 2 sets of correct/incorrect ciphertexts when inducting fault in the13 th round and 4 sets of correct/incorrect ciphertexts when inducting fault in the 12 th round.

关键词： intermediate error propagation state table injected fault position 3DES middle rounds cryptography probability theory state templates fault diagnosis data encryption standard error statistics error propagation models fault injection single-bit error propagation DFA methods inducting fault differential fault analysis

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Novel way to research nonlinear feedback shift register

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Science china(information sciences) 2014年第9期57卷 161-174页

作者： ZHAO DaWei PENG HaiPeng li liXiang hui Sili YANG YiXian information security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and Telecommunications Zhejiang Provincial key Lab of Data Storage and Transmission Technology Hangzhou Dianzi University National Engineering laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Shandong Provincial key laboratory of Computer Network Shandong Computer Science Center

In this paper,we regard the nonlinear feedback shift register(NLFSR)as a special Boolean network,and use semi-tensor product of matrices and matrix expression of logic to convert the dynamic equations of NLFSR into an equivalent algebraic *** on them,we propose some novel and generalized techniques to study ***,a general method is presented to solve an open problem of how to obtain the properties(the number of fixed points and the cycles with different lengths)of the state sequences produced by a given NLFSR,i.e.,the analysis of a given *** then show how to construct all 22n-(l-n)/22n-lshortest n-stage feedback shift registers(nFSR)and at least 22n-(l-n)-1/22n-l-1shortest n-stage nonlinear feedback shift registers(nNLFSR)which can output a given nonperiodic/periodic sequence with length ***,we propose two novel cycles joining algorithms for the construction of full-length ***,two algorithms are presented to construct 22n-2-1different full-length nNLFSRs,respectively.

关键词： nonlinear feedback shift register semi-tensor product Boolean network full-length nNLFSR binary sequence

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Compositional study of δ-NbN film by Auger electron microscopy

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Tungsten 2023年第1期5卷 130-135页

作者： Zhao-Xi Chen Peng Dong Yi-Wen Zhang Yi-Lan Jiang Yi-Fan Ding Yue-Shen wu Jing-hui Wang Xiang Zhou Jun li Center for Transformative Science ShanghaiTech UniversityShanghai 201210China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech laboratory for Topological Physics ShanghaiTech UniversityShanghai 200031China state key laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China wuhan National High Magnetic Field Center Huazhong University of Science&TechnologyWuhan 430074China

The chemical stoichiometry on the surface of superconducting δ-NbN thin films is of great importance for their ***,we fabricated the δ-NbN thin films on SiO2/Si substrate by DC sputtering *** film was characterized using X-ray diffraction(XRD) and atomic force microscopy(AFM).Transport properties were measured to reveal the field dependent superconducting transition *** XRD and electrical measurement show high crystallinity of δ-NbN phase.A homogeneous and smooth surface morphology was measured by *** electron spectroscopy(AES) was applied to analyze the composition along the depth of the *** evolution of Auger peak profile,heights and nitride stoichiometry at the film surface is *** current study provides a more thorough understanding of complex chemical compositions of δ-NbN thin films.

关键词： Superconducting films Magnetron sputtering Auger electron spectroscopy Depth profile Surface oxidation

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Some classes of complete permutation polynomials over Fq

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Science china Mathematics 2015年第10期58卷 2081-2094页

作者： wu GaoFei li Nian HELLESETH Tor ZHANG YuQing state key laboratory of Integrated Service Networks Xidian University information security and National Computing Grid laboratory Southwest Jiaotong University Department of Informatics University of Bergen National Computer Network Intrusion Protection Center University of Chinese Academy of Sciences

By using a powerful criterion for permutation polynomials, we give several classes of complete permutation polynomials over finite fields. First, two classes of complete permutation monomials whose exponents are of Niho type are presented. Second, for any odd prime p, we give a sufficient and necessary condition for a-1xdto be a complete permutation polynomial over Fp4 k, where d =(p4k-1)/(pk-1)+ 1 and a ∈ F*p4k. Finally, we present a class of complete permutation multinomials, which is a generalization of recent work.

关键词： finite field complete permutation polynomials Walsh transform Niho exponents Dickson polynomials

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