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Design and Implementation of Verification Code Identification Based on Anisotropic Heat Kernel

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China Communications 2016年第1期13卷 100-112页

作者： liu lizhao liu Jian DAI Yaomei XU Huarong YIN Huayi ZHU Shunzhi Department of Computer Science and Technology Xiamen University of Technology Department of Management Nanjing University of Science and Technology

Many websites use verification codes to prevent users from using the machine automatically to register,login,malicious vote or irrigate but it brought great burden to the enterprises involved in internet marketing as entering the verification code *** the verification code security system needs the identification method as the corresponding testing *** propose an anisotropic heat kernel equation group which can generate a heat source scale space during the kernel evolution based on infinite heat source axiom,design a multi-step anisotropic verification code identification algorithm which includes core procedure of building anisotropic heat kernel,settingwave energy information parameters,combing outverification codccharacters and corresponding peripheral procedure of gray scaling,binarizing,denoising,normalizing,segmenting and identifying,give out the detail criterion and parameter *** test show the anisotropic heat kernel identification algorithm can be used on many kinds of verification code including text characters,mathematical,Chinese,voice,3D,programming,video,advertising,it has a higher rate of 25%and 50%than neural network and context matching algorithm separately for Yahoo site,49%and 60%for Captcha site,20%and 52%for Baidu site,60%and 65%for 3DTakers site,40%,and 51%.for MDP site.

关键词： verification code image recognition data mining scale space anisotropic heat kernel

Curved carbon nanotubes： From unique geometries to novel properties and peculiar applications

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Nano Research 2014年第5期7卷 626-657页

作者： lizhao liu Feng liu Jijun Zhao Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Dalian University of Technology) Ministry of Education Dalian 116024 China Department of Materials Science and Engineering University of Utah Salt Lake City Utah 84112 USA

Incorporating pentagons and heptagons into the hexagonal networks of pristine carbon nanotubes （CNTs） can form various CNT-based nanostructures, as pentagons and heptagons will bend or twist the CNTs by introducing positive and negative curvature, respectively. Some typical so-made CNT-based nanostructures are reviewed in this article, including zero-dimensional toroidal CNTs, and one-dimensional kinked and coiled CNTs. Due to the presence of non-hexagonal rings and curved geometries, such nanostructures possess rather different structural, physical and chemical properties from their pristine CNT counterparts, which are reviewed comprehensively in this article. Additionally, their synthesis, modelling studies, and potential applications are discussed.

关键词： pentagon heptagon toroidal CNTs kinked CNTs coiled CNTs

Quantum conductance of armchair carbon nanocoils: roles of geometry effects

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Science China(Physics,Mechanics & Astronomy) 2011年第5期54卷 841-845页

作者： liu lizhao GAO HaiLi ZHAO JiJun LU JianPing Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Dalian University of Technology) Ministry of Education Dalian 116024 China College of Advanced Science and Technology Dalian University of Technology Dalian 116024 China Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials Huaiyin Normal University Huai'an 223300 China Department of Physics and Astronomy University of North Carolina at Chapel Hill Chapel Hill NC 27599 USA

Armchair carbon nanocoils (CNCs) with different geometric parameters are constructed and optimized using a tight-binding (TB) total energy model. The quantum conductance of these nanocoils is simulated employing a π-orbital TB model incorporated with the non-equilibrium Green's function theory. Compared with the perfect armchair carbon nanotubes (CNTs) and armchair CNTs with only Stone-Wales (SW) defects, the quantum conductance spectra of the armchair CNCs present distinct gaps around the Fermi level, which are mainly originated from the existence of sp3 carbon in the three-dimensional spiral structures. Moreover, the detailed conductance spectra of the armchair CNCs depend sensitively on their geometric parameters, such as tubular diameter and block-block distance.

关键词： armchair carbon nanocoil quantum conductance tight-binding model non-equilibrium Green's function

Multi-Embed Nonlinear Scale-Space for Image Trust Root Generation

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China Communications 2016年第11期13卷 170-179页

作者： lizhao liu Wentu Gao Jian liu Huayi Yin Huarong Xu Shunzhi Zhu Department of Computer Science and Technology Xiamen University of Technology Department of Management Nanjing University of Science and Technology

An image trust root is a special type of soft trust root for trusted computing. However,image trust root generation is difficult,as it needs a corresponding stable logic feature generation model and algorithm for dynamical and sustained authentication. This paper proposes a basic function of constructing new scale-spaces with deep detecting ability and high stability for image features aimed at image root generation. According to the heat distribution and spreading principle of various kinds of infinitesimal heat sources in the space medium,a multi-embed nonlinear diffusion equation that corresponds to the multi-embed nonlinear scale-space is proposed,a HARRIS-HESSIAN scale-space evaluation operator that aims at the structure acceleration characteristics of a local region and can make use of image pixels' relative spreading movement principle was constructed,then a single-parameter global symmetric proportion(SPGSP) operator was also constructed. An authentication test with 3000 to 5000 cloud entities shows the new scale-space can work well and is stable,when the whole cloud has 5%-50% behavior with un-trusted entities. Consequently,it can be used as the corresponding stable logic feature generation model and algorithm for all kinds of images,and logic relationships among image features for trust roots.

关键词： image trust root scale-space diffusion equation evolution operator feature detection

Grid Services Trusted Authentication Algorithm Based on Image Trusted Root in Scale Space

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Wuhan University Journal of Natural Sciences 2012年第6期17卷 521-530页

作者： liu lizhao liu Jian ZHU Shunzhi LI Lin SUN Zhonghai Department of Computer Science and Technology XiamenUniversity of Technology Xiamen 361005 Fujian China College of Economics and Managament Nanjing Universityof Science and Technology Nanjing 210094 Jiangsu China Department of Information Center Xiamen University ofTechnology Xiamen 361005 Fujian China Department of Information Center Xiamen Health BureauXiamen 361005 Fujian China

A new authentication algorithm for grid identity trusted computing unlimited by hardware is presented;the trusted root is made as an image *** grid entity is trusted in the soft platform when its feature of image root is entirely matched with that from the other entities＇ feature database in a scale space *** recognize and detect the stable image root feature,the non-homogeneous linear expandable scale space is *** on relations between the scale parameter of the inhomogeneous Gaussian function terms and the space evolution of thermal diffusion homogeneous equations,three space evolution operators are constructed to exact and mark the feature from image *** and verification are carried on the new scale space,operators and the core of making decisions for grid entities certifications.

关键词： grid computing trusted computing services trust authentication scale space diffusion equation evolution operator feature detection

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中医时节导引养生法应用推广现况及需求研究

保健医学研究与实践 2024年第7期21卷 7-13页

作者：王霄刘力钊张珑耀朱丹丹周倩左长辉韩思颖天津中医药大学第一附属医院心血管科天津301617 国家中医针灸临床医学研究中心天津301617 天津中医药大学研究生院天津301617 天津中医药大学公共卫生与健康科学学院天津301617 天津中医药大学体育与健康学院天津301617

目的研究中医时节导引养生发展现状,明确当前存在的问题,探究中医时节导引养生未来发展趋向,并从底层实际应用的角度提出系列建议,以期促进中医时节导引养生应用推广。方法2023年3月1日—4月5日,课题组联合天津市健身气功协会面向全国... 详细信息

目的研究中医时节导引养生发展现状,明确当前存在的问题,探究中医时节导引养生未来发展趋向,并从底层实际应用的角度提出系列建议,以期促进中医时节导引养生应用推广。方法2023年3月1日—4月5日,课题组联合天津市健身气功协会面向全国各省市居民935人发放自编结构化问卷,进行调研。分别从认知维度、行为维度、兴趣维度和需求维度方面调研中医时节导引养生的发展普及现状及存在问题,基于样本数据和访谈资料,通过交叉分析、相关分析等进行多维度定性、定量分析。结果研究对象的认知维度得分为(2.84±0.64)分,行为维度得分为(3.01±1.20)分,兴趣维度得分为(2.46±0.62)分,量表整体得分为(2.77±0.72)分。仅有13.7%的研究对象知晓二十四节气导引法,而研究对象对健身气功种类知晓率较高的前3位分别是八段锦(81.5%)、五禽戏(75.1%)、易筋经(48.0%)。在兴趣维度上,不同性别研究对象的得分差异具有统计学意义(P<0.05)。不同年龄段研究对象在认知维度、行为维度、兴趣维度及量表整体上的得分差异均有统计学意义(P<0.05):51~70岁及70岁以上研究对象的得分低于18岁以下、18~30岁及31~50岁研究对象(P<0.05)。不同受教育程度研究对象在行为维度、兴趣维度及量表整体上的得分差异均有统计学意义(P<0.05):中专/高中学历研究对象的得分低于大专/本科学历研究对象(P<0.05)。研究对象选出的中医时节导引养生认知途径前3位依次为网络、微信、微博等新媒体(65.6%),亲友、同事、老师等口碑传播(55.4%),电视、广播、电影等传统媒体(44.4%)。89.9%的研究对象认为中医时节导引养生与新技术结合会增加人们对中医时节导引养生相关知识和技能的学习兴趣。结论当前中医时节导引养生存在着群众需求与发展之间不平衡的问题,具体表现在中医时节导引养生的理论知识和实践技能缺乏普及和传承,群众认知水平较低,专业人才和服务机构匮乏,社会认可度和影响力不高等方面。建议从形式、内容、传播等方面与当前新兴技术结合,为传统导引赋予鲜活生命力,进一步加强中医时节导引养生的科学实证研究,积极刺激市场需求,拓宽推广渠道。

关键词：二十四节气健身气功体医融合调查分析健康中国2030

Analysis of Roadbed Splicing at Hub Interchanges

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Journal of World Architecture 2024年第1期8卷 24-30页

作者： lizhao Zhao Liang liu China Merchants Chongqing Communications Technology Research&Design Institute Co. LTD.Chongqing 400067China

This article discusses the roadbed splicing for hub *** article starts with a description of the characteristics of junction roadbed *** application of splicing technology is explained using a subgrade splicing scheme of a *** splicing involves stepwise excavation and preparative measures like surface cleaning and *** article serves to provide a valuable reference for road and bridge construction and improve the quality of China’s road and bridge projects,so as to achieve sustainable development of the road and bridge engineering industry.

关键词： Hub interchange Roadbed splicing Construction preparation Stepwise excavation Roadbed filling

The Application of Flexible Strategy in Complex System

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International Journal of Systems and Control

International Journal of Systems and Control 2007年第2期 159-163页

作者： liu lizhao Department of Automation,Xiamen University , Xiamen, Fujian, 361005, China

The strategic management of complex systems has extremely important theory significance and practice value; the new mentality of the thought of using the flexible strategy in the study of complex system has been proposed by this article pointing at the situation that the traditional decision-making and management is having surplus passivity but insufficient initiative. Above this foundation it takes the municipal transportation system as the example, carrying out the modeling and proofing of the traditional and flexible strategy, proposing the unifies of the flexible strategy and the mechanism of the municipal transportation system management, forming a series of new strategic management methods and modeling which is able to forecast, to seek, to adapt to the changes initiatively and even to make changes letting the objects adapt themselves. These explain the application of the new mentality has enormous economic value and greatly strengthened feasibility and praxis.

关键词： complex system flexible strategy strategic management feedback

厚度和掺杂对蛋托型石墨烯光电性质影响模拟研究

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大连理工大学学报 2023年第1期63卷 1-7页

作者：王铭键谭振权刘立钊大连理工大学化工学院辽宁大连116024 大连理工大学物理学院辽宁大连116024

石墨烯因其独特的结构特点和优异的性能受到了人们的广泛关注.在合成与应用石墨烯的过程中,本征缺陷和杂原子的引入也会显著改变石墨烯的结构和性质,并且打开石墨烯的带隙,从而能够使其更好地应用于电子设备领域.通过构建一系列不同厚... 详细信息

石墨烯因其独特的结构特点和优异的性能受到了人们的广泛关注.在合成与应用石墨烯的过程中,本征缺陷和杂原子的引入也会显著改变石墨烯的结构和性质,并且打开石墨烯的带隙,从而能够使其更好地应用于电子设备领域.通过构建一系列不同厚度的蛋托型石墨烯并对其进行掺杂,探究厚度和杂原子对其光电性质的影响.密度泛函理论计算结果表明,厚度和掺杂都可以实现蛋托型石墨烯导电性的调控,其中氮掺杂可以显著提高材料导电性,实现半导体到金属性的转变.同时,氮掺杂和硼掺杂会分别引起蛋托型石墨烯光吸收峰的蓝移和红移,实现光学检测.

关键词：蛋托型石墨烯掺杂带隙密度泛函理论