检索结果-内蒙古大学图书馆

arXiv 2018年

作者： Xue, Haoran Gao, Fei Yu, Yang Chong, Yidong Shvets, Gennady Zhang, Baile State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore School of Applied and Engineering Physics Cornell University IthacaNY14853 United States Centre for Disruptive Photonic Technologies Nanyang Technological University Singapore637371 Singapore Key Lab. of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang Electromagnetics Academy Zhejiang University Zhejiang University Hangzhou310027 China

The discovery of photonic topological insulators (PTIs)1-3 has opened the door to fundamentally new topological states of light. Current time-reversal-invariant PTIs emulate either the quantum spin Hall (QSH) effect4-11 or the quantum valley Hall (QVH) effect12-17 in condensed-matter systems, in order to achieve topological transport of photons whose propagation is predetermined by either 'photonic pseudospin' (abbreviated as 'spin') or valley. Here we demonstrate a new class of PTIs, whose topological phase is not determined solely by spin or valley, but is controlled by the competition between their induced gauge fields. Such a competition is enabled by tuning the strengths of spin-orbit coupling (SOC) and inversion-symmetry breaking in a single PTI18,19. An unprecedented topological transition between QSH and QVH phases that is hard to achieve in condensed-matter systems is demonstrated. Our study merges the emerging fields of spintronics and valleytronics in the same photonic platform, and offers novel PTIs with reconfigurable topological phases. Copyright © 2018, The Authors. All rights reserved.

关键词： Electric insulators

来源：评论

学校读者我要写书评

暂无评论

Random asynchronous iterations in distributed coordination algorithms

arXiv

引用

arXiv 2018年

作者： Chen, Yao Xia, Weiguo Cao, Ming Lü, Jinhu Department of Computer Science Southwestern University of Finance and Economics Chengdu611130 China School of Control Science and Engineering Dalian University of Technology Dalian116024 China Faculty of Science and Engineering ENTEG University of Groningen Groningen9747 AG Netherlands School of Automation Science and Electrical Engineering State Key Laboratory of Software Development Environment Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing100191 China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China

Distributed coordination algorithms (DCA) carry out information processing processes among a group of networked agents without centralized information fusion. Though it is well known that DCA characterized by an SIA (stochastic, indecomposable, aperiodic) matrix generate consensus asymptotically via synchronous iterations, the dynamics of DCA with asynchronous iterations have not been studied extensively, especially when viewed as stochastic processes. This paper aims to show that for any given irreducible stochastic matrix, even non-SIA, the corresponding DCA lead to consensus successfully via random asynchronous iterations under a wide range of conditions on the transition probability. Particularly, the transition probability is neither required to be independent and identically distributed, nor characterized by a Markov chain. Copyright © 2018, The Authors. All rights reserved.

关键词： Stochastic systems

来源：评论

学校读者我要写书评

暂无评论

Rapid detection of stego images based on identifiable features 18

Rapid detection of stego images based on identifiable featur...

引用

18th International Conference on advanced Communications Technology, ICACT 2016

作者： Pang, Weiwei Luo, Xiangyang Ren, Jie Yang, Chunfang Liu, Fenlin State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450001 China Zhengzhou Science and Technology Institute Zhengzhou450001 China Science and Technology on Information Assurance Laboratory Beijing100072 China

ISBN: (纸本)9788996865063

An increasing number of images in the Internet brings forward a higher requirement on the speed of steganalysis. For the problem of real-time detection of stego images, a rapid images steganalysis method based on identifiable features is proposed, where the identifiable features are specific character sequences left in stego images by steganography tools. The stego and cover images are distinguished according to whether the identifiable features are found in the detected images. Meanwhile, for the case of that multiple identifiable features appeared on the same location of an image, the AC (Aho-Corasick) multi-features matching algorithm is applied to improve the detection speed. In experiments, the detection method is used to detect eight steganography tools such as Invisible Secrets, E-Show, BMP Secrets and so on. The results show that the proposed steganalysis method can achieve a nearly perfect detection precision, and the detection speed can be improved significantly comparing with traditional methods (matching bytes one by one). © 2016 Global IT Research Institute (GiRI).

关键词： Steganography

来源：评论

学校读者我要写书评

暂无评论

A framework for test data generation of object-oriented programs based on complete testing chain

A framework for test data generation of object-oriented prog...

引用

ACIS International Conference on Software engineering, Artificial Intelligence, Networking, and Parallel/Distributed computing (SNPD)

作者： Gang Li Lei Yu Huihui Sun State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

Test data generation is always a hot topic in software testing since efficient test data generation method can significantly increase the efficiency of software testing and decrease the cost. Method call relation and parameter list are seldom considered in existing test data generation methods for object-oriented programs. In this paper, we present the concept of complete testing chain which stipulates the order of methods to be followed when generating test data for object-oriented programs to guarantee the correctness of test data generation. Basing on this, a framework for test data generation of object-oriented programs is proposed. We discuss encoding paradigm of test data, updating of test data and design of fitness function. For updating of test data, particle swarm optimization is introduced to realize the update of parameter list with genetic algorithm used for method sequence updating. Last but not least, a method to improve the initial population by using generated test data is presented for programs whose branch statements consist of method calls. The results show that the proposed methods can greatly increase the success rate and efficiency of test data generation for object-oriented programs.

关键词： Testing Sociology Statistics Sun

来源：评论

学校读者我要写书评

暂无评论

A method of metamorphic relations constructing for object-oriented software testing

A method of metamorphic relations constructing for object-or...

引用

ACIS International Conference on Software engineering, Artificial Intelligence, Networking, and Parallel/Distributed computing (SNPD)

作者： Xinglong Zhang Lei Yu Xuemei Hou State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

To solve the Oracle problem of methods sequence in object-oriented software testing, a method of metamorphic relations constructing for object-oriented software testing based on algebraic specification was proposed. Firstly, metamorphic relations constructing criteria for object-oriented testing was defined based on the characteristics of object-oriented software program. Then metamorphic relations were constructed based on GFT algorithm (Generating a Finite Number of Test Case). Finally the metamorphic relations were improved according to these criteria. The improved method was verified through constructing IntStrack class and SavAcc class metamorphic relations. The experiment results show that the metamorphic relations redundancy is decreased significantly. So the new method has a low metamorphic relations redundancy and improves the efficiency of software testing.

关键词： Testing Observers

来源：评论

学校读者我要写书评

暂无评论

Eavesdropper’s ability to attack a free-space quantum-key-distribution receiver in atmospheric turbulence

arXiv

引用

arXiv 2019年

作者： Chaiwongkhot, Poompong Kuntz, Katanya B. Zhang, Yanbao Huang, Anqi Bourgoin, Jean-Philippe Sajeed, Shihan Lütkenhaus, Norbert Jennewein, Thomas Makarov, Vadim Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada NTT Basic Research Laboratories NTT Corporation AtsugiKanagawa Japan NTT Research Center for Theoretical Quantum Physics NTT Corporation AtsugiKanagawa Japan Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Aegis Quantum WaterlooON Canada Department of Electrical and Computer Engineering University of Toronto M5S 3G4 Canada Quantum Information Science Program Canadian Institute for Advanced Research TorontoONM5G 1Z8 Canada Russian Quantum Center Skolkovo Moscow143025 Russia Shanghai Branch National Laboratory for Physical Sciences at Microscale and CAS Center for Excellence in Quantum Information University of Science and Technology of China Shanghai201315 China NTI Center for Quantum Communications National University of Science and Technology MISiS Moscow119049 Russia

The ability of an eavesdropper (Eve) to perform an intercept-resend attack on a free-space quantum key distribution (QKD) receiver by precisely controlling the incidence angle of an attack laser has been previously demonstrated. However, such an attack could be ineffective in the presence of atmospheric turbulence due to beam wander and spatial mode aberrations induced by the air’s varying index of refraction. We experimentally investigate the impact turbulence has on Eve’s attack on a free-space polarization-encoding QKD receiver by emulating atmospheric turbulence with a spatial light modulator. Our results identify how well Eve would need to compensate for turbulence to perform a successful attack by either reducing her distance to the receiver, or using beam wavefront correction via adaptive optics. Furthermore, we use an entanglement-breaking scheme to find a theoretical limit on the turbulence strength that hinders Eve’s attack. Copyright © 2019, The Authors. All rights reserved.

关键词： Atmospheric turbulence

来源：评论

学校读者我要写书评

暂无评论

Secure and efficient smart card based remote user password authentication scheme

引用

International Journal of Network Security 2016年第4期18卷 782-792页

作者： Wei, Jianghong Liu, Wenfen Hu, Xuexian State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Henan Province450002 China

In distributed systems, the smart card based password authentication, as one of the most convenient and efficienttwo-factor authentication mechanisms, is widely used toensure that the protected services are not available to unauthorized users. Recently, Li et al. demonstrated that the smart card ased password authentication schemeproposed by Chen et al. cannot provide perfect forward secrecy as they claimed. In addition, the password change phase of the scheme is unfriendly and inefficient. Subsequently, Li et al. presented an enhanced smart card based password authentication scheme to overcome the above aws existing in Chen et al.'s scheme. Further more, Kumari and Khan, and Jiang et al. demonstrated that Chen et al.'s scheme cannot resist off-line password guessing attacks, and also proposed an improved scheme, respectively. In this study, we first illustrate that Li et al.'s scheme, and Kumari and Khan's scheme both failto achieve the basicsecurity requirement of the smartcard based password authentication, namely, once the private information stored in the smart card has been extracted, the schemes would be vulnerable to off-line password guessing attacks. We also point out that Jiang etal.'s scheme, as well as Kumari and Khan's scheme cannot provide perfect forward secrecy. Then, we introducea new smart card based password authentication scheme. By presenting concrete analysis of security and performance, we show that the proposed scheme cannot onlyresist various wellknown attacks, but also is more efficient than other related works, and thus is feasible forpractical applications.

关键词： Smart cards

来源：评论

学校读者我要写书评

暂无评论

Two-Step Fabrication of Li₄Ti₅O₁₂-Coated Carbon Nanofibers as a Flexible Film Electrode for High-Power Lithium-Ion Batteries

引用

ChemElectroChem 2017年第9期4卷 2286-2292页

作者： Zhang, Zhaobao Deng, Xiang Sunarso, Jaka Cai, Rui Chu, Shiyong Miao, Jie Zhou, Wei Shao, Zongping Jiangsu National Synergetic Innovation Center for Advanced Materials State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University No.5 Xin Mofan Road Nanjing 210009 China College of Energy Nanjing Tech University No.5 Xin Mofan Road Nanjing 210009 China Department of Chemical Engineering Curtin University Perth 6845 WA Australia Faculty of Engineering Computing and Science Swinburne University of Technology Jalan Simpang Tiga Kuching Sarawak 93350 Malaysia

A self-standing nonwoven flexible Li4Ti5O12/carbon nanofiber composite (denoted LTO/CNF) was synthesized by using a facile method involving the electrospinning fabrication of CNFs and chemical deposition of LTO over t... 详细信息

A self-standing nonwoven flexible Li₄Ti₅O₁₂/carbon nanofiber composite (denoted LTO/CNF) was synthesized by using a facile method involving the electrospinning fabrication of CNFs and chemical deposition of LTO over the CNF surface. Scanning electron microscopy and transmission electron microscopy analyses show that the LTO/CNF film is composed of 50±20 nm diameter LTO polycrystalline particles distributed over 300±50 nm diameter CNF nanofibers. The nitrogen sorption isotherm further reveals the existence of mesopores in the LTO/CNF film. The as-prepared LTO/CNF composite exhibits attractive rate capability for lithium-ion batteries (LIBs), delivering initial specific capacities of 158, 153, 146, 138, 131, 122, and 109 mA h g⁻¹ at rates of 1, 5, 10, 20, 30, 40, and 50 C, respectively, and a very stable cycling performance during 500 charge and discharge cycles at 20 C, which superior to electrodes made of commercial coarse-type LTO anodes. In addition, the electrochemical impedance is effectively reduced by fabricating the unique electrode architecture, which originates from the improved 3D conducting network and the nanocrystalline size of the LTO active phase. Electrospinning of CNFs and chemical deposition of a nanocrystalline LTO phase proves to be an effective and facile method to develop anodes for flexible LIBs with a wide range of potential applications. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： electrospinning flexible electronics lithium titanate lithium-ion batteries self-standing electrode

来源：评论

学校读者我要写书评

暂无评论

Entity disambiguation with markov logic network knowledge graphs

引用

International Journal of Performability engineering 2017年第8期13卷 1293-1303页

作者： Ma, Jiangtao Wei, Tao Qiao, Yaqiong Huang, Yongzhong Xie, Weibo Zhang, Chaoqin Wang, Yanjun Zhan, Rui State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450002 China Zhengzhou University of Light Industry Zhengzhou450002 China National Digital Switching System Engineering and Technological R and D Center Zhengzhou451000 China Henan Institute of Engineering Computer College Zhengzhou451000 China North China University of Water Resources and Electric Power Zhengzhou450002 China

Disambiguating named entities is an important problem in natural language processing, knowledge base, question answering systems. In the paper, we propose a Markov logic network knowledge graph solution for solving entity resolution problem. First, we employ knowledge graph to represent the entity relationship between linked entities in the knowledge base. Then, we utilize MLN to inference the inconsistent relationship in the knowledge graph, and disambiguate the entities in the process of entity disambiguation. As far as we know, inferencing with MLN is a first attempt for entity disambiguation in the knowledge graph. We evaluate the proposed solution with three real world knowledge bases and compare it with four baseline solutions. The experimental results demonstrate that our solution is 7% higher than other baseline methods with F1 measure. We also test our scheme and compare entity resolution systems on four datasets with three knowledge base corpora. Extensive experiments show that our solution achieves higher precision and recall than baseline solutions. © 2017 Totem Publisher, Inc. All rights reserved.

关键词： Natural language processing systems

来源：评论

学校读者我要写书评

暂无评论

A hidden service model based on HS-HS anonymous network

引用

AIP Conference Proceedings 2017年第1期1890卷

作者： Yitong Meng Xing Zhao Jinlong Fei Yuefei Zhu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Henan 450001 China

The Hidden Service provided by Tor anonymous network can effectively protect the anonymity and security of the Hidden server, this article through the analysis of the data packet structure of Tor, three jump transmission mechanism and link establishment protocol and Hidden Service communication process, in view of the Hidden node number too much, link building Service for too long and too redundant link problem. An improved hidden service model HS-HS is proposed that incorporating multiple transmission link and reuse, and at the same time will be important transit point for reuse protection link anonymity, through the ExperimenTor simulation environment test, verify the improved model of HS-HS can be more effective in guarantee anonymity and security, improve the overall efficiency of data transmission, to meet the needs of today’s anonymous service.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：