检索结果-南通市图书馆

Modeling of unsupervised knowledge graph of events based on mutual information among neighbor domains and sparse representation

引用

Defence Technology（防务技术） 2022年第12期18卷 2150-2159页

作者： jing-tao Sun jing-Ming Li Qiu-Yu Zhang School of Computer Science and Technology Xi'an University of Posts and TelecommunicationsXi'anShaanxi710121China Shaanxi Key Laboratory of Network Data Analysis and Intelligent Processing Xi'an University of Posts and TelecommunicationsXi'anShaanxi710121China School of Management Science and Engineering Anhui University of Finance and EconomicsBengbuAnhui230030China School of Computer and Communication Lanzhou University of TechnologyLanzhouGansu730050China

Text event mining,as an indispensable method of text mining processing,has attracted the extensive attention of researchers.A modeling method for knowledge graph of events based on mutual information among neighbor domains and sparse representation is proposed in this paper,***,UKGE-MS can improve the existing text mining technology's ability of understanding and discovering high-dimensional unmarked information,and solves the problems of traditional unsupervised feature selection methods,which only focus on selecting features from a global perspective and ignoring the impact of local connection of ***,considering the influence of local information of samples in feature correlation evaluation,a feature clustering algorithm based on average neighborhood mutual information is proposed,and the feature clusters with certain event correlation are obtained;Secondly,an unsupervised feature selection method based on the high-order correlation of multi-dimensional statistical data is designed by combining the dimension reduction advantage of local linear embedding algorithm and the feature selection ability of sparse representation,so as to enhance the generalization ability of the selected feature ***,the events knowledge graph is constructed by means of sparse representation and l1 *** experiments are carried out on five real datasets and synthetic datasets,and the UKGE-MS are compared with five corresponding *** experimental results show that UKGE-MS is better than the traditional method in event clustering and feature selection,and has some advantages over other methods in text event recognition and discovery.

关键词： Text event mining Knowledge graph of events Mutual information among neighbor domains Sparse representation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Current Oscillation and dc-Voltage-Controlled Chaotic Dynamics in Semiconductor Superlattices

引用

Communications in Theoretical Physics 2006年第2期45卷 363-368页

作者： WANG Chang LU jing-tao State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology the Chinese Academy of Sciences Shanghai 200050 China

We report a detailed theoretical study of current oscillation and de-voltage-controlled chaotic dynamics in doped GaAs/AlAs resonant tunneling superlattices under crossed electric and magnetic fields. When the superlattice is biased at the negative differential velocity region, current self-oscillation is observed with proper doping concentration. The current oscillation mode and oscillation frequency can be affected by the dc voltage bias, doping density, and magnetic field. When an ac electric field with fixed amplitude and frequency is also applied to the system, different nonlinear properties show up in the external circuit with the change of dc voltage bias. We carefully study these nonlinear properties with different chaos-detecting methods.

关键词： semiconductor superlattices current oscillation chaotic dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Contact Electrification and Adhesion Between Carbon Nanotube and Graphene on Metal Surfaces: Insights from First-principles Study

引用

Journal of Bionic Engineering 2022年第1期19卷 103-112页

作者： jing tao Linfeng Wang Jin Li Zhendong Dai Jiangsu Provincial Key Laboratory of Bionic Functional Materials College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing210016China

The effect of contact electrification on adhesion has been debated in recent years for gecko and bio-inspired dry adhesion *** understand the fundamentals of this issue for Carbon Nanotube(CNT)dry adhesives,contact electrification and its relationship with adhesion are systematically studied using the first-principles *** transfers from CNT or its special form,graphene,to the metal surface during the contact,and the transferred charge linearly correlates with the work function ***,the adhesion energy is linearly related to the transferred charge for both CNT and *** charge transfers from the flat graphene to metal surfaces than the curved CNT,leading to higher adhesion between graphene and metal *** curved structure of the CNT causes an irregular change of charge at the interface and hinders the charge ***,the curved structure induces electronic localization,which also decreases the interfacial charge *** structure affects contact electrification,and hence adhesion is further demonstrated by the CNT with different deformation when contacting different *** study advances our understanding of contact electrification and its relationship with adhesion at the interface for bio-inspired carbon adhesive materials and sheds light on the control of them for engineering applications.

关键词： Contact electrification Adhesion Bio-inspired adhesive CNT First-principles calculation Interfacial interaction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of hot/warm roll-forming process on microstructural evolution and mechanical properties of local thickened U-rib for orthotropic steel deck

引用

Journal of Iron and Steel Research International 2017年第3期24卷 335-342页

作者： Xue-feng Peng jing Liu jing-tao Han Dong-bin Wei School of Materials Science and Engineering University of Science and Technology Beijing School of Electrical Mechanical and Mechatronic SystemsFaculty of Engineering and Information TechnologyUniversity of Technology Sydney

To improve the strength-toughness of traditional U-rib（ TUR） and solve the problem of insufficient penetration between TUR and deckplate,a new local thickened U-rib（ LTUR） has been proposed to improve the fatigue resistance of the weld joint under the premise of not increasing thickness and strength of the TUR material. And a hot /warm roll-forming process（ RFP） adopting partially induction heating to 700- 1 000℃ was carried out to fabricate LTUR. The deformation behaviors in the forming process and microstructure of LTUR have been *** properties and fracture mechanism of the LTUR after hot / warm RFP have been systematically discussed. Moreover,the results are compared with those obtained in cold RFP. Mechanical properties of the LTUR deformed above the critical transformation temperature（ A_（c3）） show high performance characteristics with marked fatigue resistance and superior toughness. Upon increasing the heating temperature from 700 to 900 ℃,the initial coarse ferrite-pearlite structure transform into equiaxed ultrafine ferrite（ 1- 3 μm） and precipitates such as（ Nb,Ti）（ C,N） are uniformly distributed in the matrix. The average dislocation density of the specimens after hot rollforming at heating temperature of 900 ℃ decreases dramatically compared with those of the specimens subjected to the cold RFP. Furthermore,a typical characteristic of ductile fracture mechanism and the high impact energy are more convinced that the specimens deformed above 900 ℃ have obtained an optimal combination of strength and toughness.

关键词： Orthotropic steel deck Local thickened U-rib Hot roll-forming process Warm roll-forming process Microstructural evolution Deformation behavior

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research of the traffic characteristics for the real time online traffic classification

引用

The Journal of China Universities of Posts and Telecommunications 2011年第3期18卷 92-98页

作者： SUN Mei-feng CHEN jing-tao College of Information Engineering Yangzhou University Yangzhou 225009 China

Aiming at the hysteretic characteristics of classification problem existed in current intemet traffic identification field, this paper investigates the traffic characteristic suitable for the on-line traffic classification, such as quality of service （QoS）. By the theoretical analysis and the experimental observation, two characteristics （the ACK-Len ab and ACK-Len ha） were obtained. They are the data volume which first be sent by the communication parties continuously. For these two characteristics only depend on data＇s total length of the first few packets on the flow, network traffic can be classified in the early time when the flow arrived. The experiment based on decision tree C4.5 algorithm, with above 97% accuracy. The result indicated that the characteristics proposed can commendably reflect behavior patterns of the network application, although they are simple.

关键词： on-line traffic classification traffic characteristics ACK-Len ab ACK-Len ba

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Digitalization Modeling System for Constitutive Relation of Geomaterial

引用

Journal of China University of Mining and Technology 2006年第3期16卷 338-343页

作者： CHENG tao WANG jing-tao YAN Ke-qin School of Civil Engineering ＆ Mechanics Huazhong University of Science ＆ Technology Wuhan Hubei 430074China Department of Civil Engieering Huangshi Collage of Science ＆Technology Huangshi Hubei 435003 China

A digital modeling system method is put forward for modeling constitutive relation of geomaterial including digital image subsystem for deformation measurement, numerical modeling subsystem and numerical simulation subsystem. A non-contact measurement method based on digital image processing is introduced to improve measurement of specimen deformation. Based on the method, a series of conventional tri-axial compression tests under diverse stress paths are done. Then an elasto-plastic constitutive model of soil is acquired through the numerical method of modeling constitutive law for geomaterial. Two examples of specimen deformation and ground subsidence are presented and discussed. It indicated that this method can rationally simulate the stress-strain relationship of soil, which reflects the effect of stress path on soil stress-strain relationship.

关键词： digital image processing specimen deformation numerical modeling simulation stress path dilatancy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Development of High-energy Particle Detectors for Space Exploration

引用

空间科学学报 2022年第6期42卷 1171-1184页

作者： YANG Zhe SHEN Guohong jing tao National Space Science Center Chinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049 Beijing Key Laboratory of Space Environment Exploration Beijing 100190 Key Laboratory of Science and Technology on Space Environment Situational Awareness Chinese Academy of SciencesBeijing 100190

Space environment exploration is a hot topic *** scope of space exploration ranges from near-Earth space to the moon,other planets in the solar system,and even the heliosphere and interplanetary *** is used for various crucial applications,including aerospace technology development,space weather research,understanding the origin and evolution of the universe,searching for extraterrestrial life,and finding human livable *** China’s space environment exploration started late,its progress has been *** is gradually narrowing the gap with advanced countries and may eventually lead the world in space *** article briefly reviews the development history of China’s space environmental detectors.

关键词： High-energy particle detectors Near-Earth space exploration Lunar exploration Space environment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tailoring mechanical heterogeneity,nanoscale creep deformation and optical properties of nanostructured Zr-based metallic glass

引用

Rare Metals 2023年第10期42卷 3430-3442页

作者： jing-Xian Cui Qiang Luo Zheng-Guo Zhang jing-tao Zhu Bao-Long Shen School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing211189China School of Physics Science and Engineering Tongji UniversityShanghai200092China

Metallic glasses are spatially heterogeneous at the nanometer ***,the effects of external excitation on their structural and mechanical heterogeneity and the correlation to their properties are still ***,atomic force microscopy(AFM) and high-resolution transmis sion elec tron micro scopy(HRTEM) were carried out to explore the effects of cryogenic thermal cycling(CTC) on mechanical/structural heterogeneity,nano sc ale creep deformation and optical properties of nano structured metallic glass thin films(MGTFs).The results indicate that CTC treatment alters the distribution fluctuations of hardness/modulus and energy dissipation and results in an increase-then-decrease variation in mechanical *** applying Maxwell-Voigt model,it can be shown that CTC treatment results in a remarkable activation of more defects with longer relaxation time in soft regions but has only a slight effect on defects in hard *** addition,CTC treatment increases the transition time from primary-state stage to steady-state stage during creep *** enhanced optical reflectivity of the MGTFs after 15 thermal cycles can be attributed to increased aggregation of Cu and Ni *** results of this study shed new light on understanding mechanical/structural heterogeneity and its influence on nanoscale creep deformation and optical characteristics of nanostructured MGTFs,and facilitate the design of high-performance nanostructured MGTFs.

关键词： Metallic glass thin films(MGTFs) Cryogenic thermal cycling(CTC) Structural heterogeneity Mechanical and creep properties Optical characteristics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Momentum Transfer of an Atom Moving in an Optical Cavity

引用

Chinese Physics Letters 2001年第8期18卷 1069-1071页

作者： ZHANG jing-tao XU Zhi-Zhan Laboratory for High Intensity Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800

When an atom moves in an optical cavity,the total momentum of the atom does not keep *** study a two-level atom moving slowly in an optical cavity,and give the time dependence of its mean *** is found that when the initial momentum of the atom is larger than that of the photon,the mean momentum oscillates around a value less than the initial value,But,if the initial momentum is less than the momentum of the photon,the mean momentum of the atom is greater than its initial value in most time.

关键词： momentum value initial

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An Overview of Privacy Preserving Schemes for Industrial Internet of Things

引用

China Communications 2020年第10期17卷 1-18页

作者： Yan Huo Chun Meng Ruinian Li tao jing School of Electronics and Information Engineering Beijing Jiaotong UniversityBeijing 100044China The Department of Computer Science Bowling Green State UniversityBowling GreenOhio43403USA

The concept of Internet of Everything is like a revolutionary storm,bringing the whole society closer *** of Things(IoT)has played a vital role in the *** the rise of the concept of Industry 4.0,intelligent transformation is taking place in the industrial *** a new concept,an industrial IoT system has also attracted the attention of industry and *** an actual industrial scenario,a large number of devices will generate numerous industrial *** computing efficiency of an industrial IoT system is greatly improved with the help of using either cloud computing or edge ***,privacy issues may seriously harmed interests of *** this article,we summarize privacy issues in a cloud-or an edge-based industrial IoT *** privacy analysis includes data privacy,location privacy,query and identity *** addition,we also review privacy solutions when applying software defined network and blockchain under the above two ***,we analyze the computational complexity and privacy protection performance of these ***,we discuss open issues to facilitate further studies.

关键词： privacy preserving cloud computing edge computing industrial Internet of Things

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：