检索结果-内蒙古大学图书馆

Research on Stream Cipher Model Based on Chaos Theory

International Journal of Technology Management 2013年第2期 91-93页

作者： Sun Wenjie State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Henan 102206

Chaos is a similar and random process which is very sensitive to initial value in deterministic system. It is a performance of nonlinear dynamical system with built-in randomness. Combined with the advantages and disadvantages of the present chaos encryption model, the paper proposes a chaotic stream cipher model based on chaos theory, which not only overcomes finite precision effect, but also improves the randomness of chaotic system and output sequence. The Sequence cycle theory generated by the algorithm can reach more than 10600 at least, which completely satisfies the actual application requirements of stream cipher system.

关键词： chaos theory stream cipher algorithm

来源：评论

学校读者我要写书评

暂无评论

A cost model for automatic OpenMP parallelization

引用

Ruan Jian Xue Bao/Journal of Software 2014年 25卷 101-110页

作者： Li, Yan-Bing Zhao, Rong-Cai Liu, Xiao-Xian Zhao, Jie PLA Information Engineering University Zhengzhou450001 China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450001 China Logistics Information Center Guangzhou Military Region Joint Logistics Department Guangzhou510000 China

Existing OpenMP cost models does not give enough thought to the implementation details of OpenMP programs so they cannot be applied widely to different types of parallel loops. To solve this problem, this study extends the cost model in the most advanced product-level optimizing compiler Open64. Targeting single candidate parallel loop, it establishes a cost model suite for the OpenMP benefit analysis. Besides improving the original DOALL-loop faced cost model in the Open64 compiler, two additional models which are also designed for DOACROSS and DSWP (Decoupled Software Pipelining) loops respectively. The experimental results show that the proposed cost model suite can simulate the execution cost of parallel programs very well, and therefore can better support cost evaluation of OpenMP parallelization. ©2014 ISCAS.

关键词： Cost benefit analysis

来源：评论

学校读者我要写书评

暂无评论

GramFuzz: Fuzzing testing of web browsers based on grammar analysis and structural mutation

GramFuzz: Fuzzing testing of web browsers based on grammar a...

引用

2013 2nd International Conference on Informatics and Applications, ICIA 2013

作者： Guo, Tao Zhang, Puhan Wang, Xin Wei, Qiang China Information Technology Security Valuation Center Beijing China State Key Laboratory of Mathematical Engineerning and Advanced Computing Zhenzhou China

ISBN: (纸本)9781467352550

Fuzz testing is an automated black-box testing technique providing random data as input to a software system in the hope to find vulnerability. In order to be effective, the fuzzed input must be common enough to pass elementary consistency checks. Web Browser accepts JavaScript, CSS files as well as the html as input, which must be considered in fuzzing testing, while traditional fuzzing technology generates test cases using simple mutation strategies, ignoring the grammar and code structure. In this article, vulnerability patterns are summarized and a new fuzzing testing method are proposed based on grammar analysis of input data and mutation of code structure. Combining methods of generation and mutation, test cases will be more effective in the fuzzing testing of web browsers. Applied on the Mozilla and IE web browsers, it discovered a total of 36 new severe vulnerabilities(and thus became one of the top security bug bounty collectors within this period). © 2013 IEEE.

关键词： Web browsers

来源：评论

学校读者我要写书评

暂无评论

Embedding change rate estimation based on ensemble learning 13

Embedding change rate estimation based on ensemble learning

引用

1st ACM Workshop on Information Hiding and Multimedia Security, IH and MMSec 2013

作者： Li, Zhenyu Hu, Zongyun Luo, Xiangyang Lu, Bin State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450002 China Zhengzhou Institute of Information Science and Technology Zhengzhou 450002 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China

ISBN: (纸本)9781450320818

In order to achieve higher estimation accuracy of the embedding change rate of a stego object, an ensemble learning-based estimation method is presented. First of all, a framework of embedding change rate estimation based on estimator ensemble is proposed. Then an algorithm of building the estimator ensemble, the core of the framework, is concretely described. Finally, a pruning method for estimator ensemble is proposed in consideration of both the diversity among the base estimators and accuracy of each of them. The experimental results for three modern steganographic algorithms (nsF5, PQ and PQt) indicate that the proposed method acquired better performance than the existed typical method. Furthermore, the pruned estimator ensemble with less base estimators maintained, even slightly improved the estimation accuracy, compared to the one without purning. © 2013 ACM.

关键词： Steganography

来源：评论

学校读者我要写书评

暂无评论

An Automatic Parallel-Stage Decoupled Software Pipelining Parallelization Algorithm Based on OpenMP

An Automatic Parallel-Stage Decoupled Software Pipelining Pa...

引用

IEEE International Conference on Trust, Security and Privacy in computing and Communications (TrustCom)

作者： Xiaoxian Liu Rongcai Zhao Lin Han Peng Liu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781479914449

While multicore processors increase throughput for multi-programmed and multithreaded codes, many important applications are single threaded and thus do not benefit. Automatic parallelization techniques play an important role in migrating singe threaded applications to multicore platforms. Unfortunately, the prevalence of control flow, recursive data structures, and general pointer accesses in ordinary programs renders the traditional automatic parallelization techniques unsuitable. Parallel-Stage Decoupled Software Pipelining (PS-DSWP) is proposed to exploit fine-grained pipeline parallelism lurking in ordinary programs with the existence of all kinds of dependences, including arbitrary control dependences, at the instruction level. But it requires knowledge of architectural properties and hardware support of a communication channel and two special instructions. We propose an improved PS-DSWP algorithm based on OpenMP in this paper. It is implemented without relying on CPU architectures by using a high level intermediate representation. Moreover, the Program Dependence Graph (PDG) used in the algorithm is built based on the basic blocks, which exploits coarser-grained parallelism than the original PS-DSWP transformation with PDG based on instructions. OpenMP is employed in our algorithm to assign task and implement synchronization among threads while avoiding dependence on hardware support. We evaluate the loops with complex memory patterns and control flow, which cannot be dealt with by traditional techniques, on multicore platform. As a result, they can be parallelized and gain significant performance improvement with our algorithm. We obtain a maximum speedup as high as 2.07x and on average 1.39x with 5 threads.

关键词： Instruction sets Synchronization Pipeline processing Multicore processing Merging

来源：评论

学校读者我要写书评

暂无评论

Convergence and Scalarization in Whole Function Vectorization

Convergence and Scalarization in Whole Function Vectorizatio...

引用

IEEE International Symposium on Dependable, Autonomic and Secure computing (DASC)

作者： Feng Yue Jianmin Pang Jiuzhen Jin Dai Chao State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

When implementing SPMD programs on multi core platforms, whole function vectorization is an important optimization method. SPMD program has drawback that lots of instructions across multi threads are redundant which is sustained in vectorization. This paper proposes to alleviate this overhead by detecting scalar operations and extract them out in vectorization instructions. An algorithm is designed to deal with control flow and data flow synchronously in which convergent and invariance analysis is employed to statically identify convergent execution and invariant values or instructions. Our algorithm is effectively on implementing SPMD programs on multi core platforms. The experiments show our method could improve the execution efficiency by 13.3%.

关键词： Convergence Optimization Algorithm design and analysis Vectors Instruction sets Graphics processing units Multicore processing

来源：评论

学校读者我要写书评

暂无评论

The Speedup Model for Manycore Processor

The Speedup Model for Manycore Processor

引用

International Conference on Information Science and Cloud computing Companion (ISCC-C)

作者： Nan Ye Ziyu Hao Xianghui Xie State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi China

ISBN: (纸本)9781479952465

Integrating a large number of simple cores on the chip to provide the desired performance and throughput, microprocessor has entered the many core era. In order to fully extract the ability of the many core processor, we propose speedup models for many core architecture in this paper. Under the assumption of Hill-Marty model, we deduce our formulas based on Gustafson's Law and Sun-Ni's Law. Then, compared with the Hill-Marty model, we theoretically analyze the best allocation under the given resources. Furthermore, we apply the conclusions of our models to evaluate current many core processors and predict concrete future architecture. Our results show that the many core architecture is capable of extensive scalability and being beneficial to promote the performance, especially heterogeneous one. By using simple analytical models, we provide a better understanding of architecture design and our work complement existing studies.

关键词： Computational modeling Computer architecture Complexity theory Analytical models Parallel processing Predictive models Resource management

来源：评论

学校读者我要写书评

暂无评论

One Wide-Sense Circuit Tree per Traffic Class Based Inter-domain Multicast

One Wide-Sense Circuit Tree per Traffic Class Based Inter-do...

引用

International Conference on Networking, Architecture, and Storage (NAS)

作者： Chen Yue Li Chaoling Huang Kaixiang Zhang Xiaobo State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

Traditional multicast protocol forms multicast trees rooted at different sources to forward packets. If the multicast sources and receivers are in different domains, these trees will produce a great number of multicast states in the backbone, resulting in poor scalability. Therefore, we propose a one Wide-Sense Circuit Tree per Traffic Class based inter-domain multicast (WSCT-TC), in which a Wide-Sense Circuit Tree (WSCT) is established for a class of multicast traffic. The WSCT is established in the backbone, along which multicast packets are forwarded by label switching. The spec of WSCT can be reconfigured according to the QoS (Quality of Service) requirement of multicast applications, to provide preferable QoS. Simulating experiment shows that WSCT-TC behaves better scalability.

关键词： Switches Receivers IP networks Quality of service Routing protocols Internet

来源：评论

学校读者我要写书评

暂无评论

ZZ→ℓ+ℓ−ℓ′+ℓ′− cross-section measurements and search for anomalous triple gauge couplings in 13 TeV pp collisions with the ATLAS detector

引用

Physical Review D 2018年第3期97卷 032005-032005页

作者： M. Aaboud G. Aad B. Abbott O. Abdinov B. Abeloos S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersberger T. Adye A. A. Affolder Y. Afik T. Agatonovic-Jovin C. Agheorghiesei J. A. Aguilar-Saavedra S. P. Ahlen F. Ahmadov G. Aielli S. Akatsuka H. Akerstedt T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alberghi J. Albert P. Albicocco M. J. Alconada Verzini S. C. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos M. Alhroob B. Ali M. Aliev G. Alimonti J. Alison S. P. Alkire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty B. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi B. T. Amadio Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso G. Amundsen C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov N. Anjos A. Annovi C. Antel M. Antonelli A. Antonov D. J. Antrim F. Anulli M. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque V. Araujo Ferraz A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster L. J. Armitage O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asbah A. Ashkenazi L. Asquith K. Assamagan R. Astalos M. Atkinson N. B. Atlay K. Augsten G. Avolio B. Axen M. K. Ayoub G. Azuelos A. E. Baas M. J. Baca H. Bachacou K. Bachas M. Backes P. Bagnaia M. Bahmani H. Bahrasemani J. T. Baines M. Bajic O. K. Baker E. M. Baldin P. Balek F. Balli W. K. Balunas E. Banas A. Bandyopadhyay Sw. Banerjee A. A. E. Bannoura L. Barak E. L. Barberio D. Barberis M. Barbero T. Barillari M-S Barisits J. T. Barkeloo T. Barklow N. Barlow S. L. Barnes B. M. Barnett R. M. Barnett Z. Barnovska-Blenessy A. Baroncelli G. Barone A. J. Barr L. Barranco Navarro F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton P. Bartos A. Basalaev A. B Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics University of Toronto Toronto Ontario Canada Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel Center for High Energy Physics University of Oregon Eugene Oregon USA Department of Physics Stockholm University Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics The University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Institute of Physics University of Belgrade Belgrade Serbia Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Laboratório de Instrumentação e Física Experimental de Partículas - LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos Universidad de Granada Granada Portugal Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Un

Measurements of ZZ production in the ℓ+ℓ−ℓ′+ℓ′− channel in proton–proton collisions at 13 TeV center-of-mass energy at the Large Hadron Collider are presented. The data correspond to 36.1 fb−1 of collisions collected by the ATLAS experiment in 2015 and 2016. Here ℓ and ℓ′ stand for electrons or muons. Integrated and differential ZZ→ℓ+ℓ−ℓ′+ℓ′− cross sections with Z→ℓ+ℓ− candidate masses in the range of 66 GeV to 116 GeV are measured in a fiducial phase space corresponding to the detector acceptance and corrected for detector effects. The differential cross sections are presented in bins of twenty observables, including several that describe the jet activity. The integrated cross section is also extrapolated to a total phase space and to all standard model decays of Z bosons with mass between 66 GeV and 116 GeV, resulting in a value of 17.3±0.9[±0.6(stat)±0.5(syst)±0.6(lumi)] pb. The measurements are found to be in good agreement with the standard model. A search for neutral triple gauge couplings is performed using the transverse momentum distribution of the leading Z boson candidate. No evidence for such couplings is found and exclusion limits are set on their parameters.

关键词： Electroweak interaction W & Z bosons Particle data analysis

来源：评论

学校读者我要写书评

暂无评论

First observation of γ rays emitted from excited states south-east of Sn132: The πg9/2−1⊗νf7/2 multiplet of In83132

引用

Physical Review C 2016年第4期93卷 041301(R)-041301(R)页

作者： A. Jungclaus A. Gargano H. Grawe J. Taprogge S. Nishimura P. Doornenbal G. Lorusso Y. Shimizu G. S. Simpson P.-A. Söderström T. Sumikama Z. Y. Xu H. Baba F. Browne N. Fukuda R. Gernhäuser G. Gey N. Inabe T. Isobe H. S. Jung D. Kameda G. D. Kim Y.-K. Kim I. Kojouharov T. Kubo N. Kurz Y. K. Kwon Z. Li H. Sakurai H. Schaffner K. Steiger H. Suzuki H. Takeda Zs. Vajta H. Watanabe J. Wu A. Yagi K. Yoshinaga S. Bönig L. Coraggio J.-M. Daugas F. Drouet A. Gadea S. Ilieva N. Itaco T. Kröll A. Montaner-Pizá K. Moschner D. Mücher H. Nishibata A. Odahara R. Orlandi A. Wendt Instituto de Estructura de la Materia CSIC E-28006 Madrid Spain Istituto Nazionale di Fisica Nucleare Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy GSI Helmholtzzentrum für Schwerionenforschung GmbH 64291 Darmstadt Germany Departamento de Física Teórica Universidad Autónoma de Madrid E-28049 Madrid Spain RIKEN Nishina Center RIKEN 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan National Physical Laboratory NPL Teddington Middlesex TW11 0LW United Kingdom Department of Physics University of Surrey Guildford GU2 7XH United Kingdom LPSC Université Joseph Fourier Grenoble 1 CNRS/IN2P3 Institut National Polytechnique de Grenoble F-38026 Grenoble Cedex France Department of Physics Tohoku University Aoba Sendai Miyagi 980-8578 Japan Department of Physics University of Tokyo Hongo 7-3-1 Bunkyo-ku 113-0033 Tokyo Japan School of Computing Engineering and Mathematics University of Brighton Brighton BN2 4JG United Kingdom Physik Department E12 Technische Universität München D-85748 Garching Germany Institut Laue-Langevin B.P. 156 F-38042 Grenoble Cedex 9 France Department of Physics Chung-Ang University Seoul 156-756 Republic of Korea Rare Isotope Science Project Institute for Basic Science Daejeon 305-811 Republic of Korea Department of Nuclear Engineering Hanyang University Seoul 133-791 Republic of Korea School of Physics and State key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China MTA Atomki P.O. Box 51 Debrecen H-4001 Hungary Department of Physics Osaka University Machikaneyama-machi 1-1 Osaka 560-0043 Toyonaka Japan Department of Physics Faculty of Science and Technology Tokyo University of Science 2641 Yamazaki Noda Chiba Japan Institut für Kernphysik Technische Universität Darmstadt D-64289 Darmstadt Germany CEA DAM DIF 91297 Arpajon cedex France Instituto de Física Corpuscular CSIC-Univ. of Valencia E-46980 Paterna Spain Seconda Universit di Napoli Dipartimento di Matematica e Fisic

For the first time, the γ decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic Sn132, a region in which experimental information so far is limited to ground-state properties. Six γ rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the β-delayed neutron emission from Cd85133, populated in the projectile fission of a U238 beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the π0g9/2−1⊗ν1f7/2 particle-hole multiplet in In83132. In addition, theoretical estimates based on a scaling of the two-body matrix elements for the πh11/2−1⊗νg9/2 analog multiplet in Tl127208, one major proton and one major neutron shell above, are presented.

关键词： Beta decay 90 ≤ A ≤ 149 Radioactive beams Shell model

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：