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检索条件"任意字段=6th International Conference on Algorithms and Discrete Applied Mathematics"

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Network studies in Russia: From articles to the structure of a research community 1

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6th international conference on Network Analysis, NET 2016

作者： Maltseva, Daria Karpov, Ilia International Laboratory for Applied Network Research National Research University Higher School of Economics Moscow Russia

ISBN: (数字)9783319568294

ISBN: (纸本)9783319568287

Our research focuses on the structure of a research community of Russian scientists involved in network studies, which is studied by means of analysis of articles published in Russian-language journals. the direction of network studies in Russia is quite new form of research methodology—however, in recent years we can observe the growing number of scientists working at this direction and institutionalized forms of their cooperation. Studying the structure of these researchers’ community is important for the fields development. this paper is the first report on the research, that is why it focuses on methodological issues. It covers the description of method of citation (reference) analysis that we use and the process of data collection from *** resource, as well as presents some brief overview of collected data (based on analysis of 8 000 papers). It is concluded by representation of future steps of the research. © Springer international Publishing AG 2017.

关键词： Computers

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Evolution of Copulas in discrete Processes with Application to a Numerical Modeling of Dependence Relation Between Exchange Rates 6th

Evolution of Copulas in Discrete Processes with Application ...

引用

6th international conference on Numerical Analysis and Applications (NAA)

作者： Ishimura, Naoyuki Yoshizawa, Yasukazu Chuo Univ Fac Commerce Tokyo 1920393 Japan Tokio Marine & Nichido Life Insurance Co Ltd Tokyo 1008050 Japan

ISBN: (纸本)9783319570990;9783319570983

Copulas are known to provide a flexible tool for analyzing the dependence structure between random events. Here we apply the newly introduced notion of evolution of copulas to real data of exchange rates so that we ensure the quality of practically employing our theory. Results show that our algorithm provides a prospective handy method in computational finance.

关键词： Finance

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Time discrete Extrapolation in a Riemannian Space of Images 6th

Time Discrete Extrapolation in a Riemannian Space of Images

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6th international conference on Scale Space and Variational Methods in Computer Vision (SSVM)

作者： Effland, Alexander Rumpf, Martin Schaefer, Florian Univ Bonn Inst Numer Simulat Bonn Germany CALTECH Pasadena CA 91125 USA

ISBN: (纸本)9783319587714;9783319587707

the Riemannian metamorphosis model introduced and analyzed in [7,12] is taken into account to develop an image extrapolation tool in the space of images. To this end, the variational time discretization for the geodesic interpolation proposed in [2] is picked up to define a discrete exponential map. For a given weakly differentiable initial image and a sufficiently small initial image variation it is shown how to compute a discrete geodesic extrapolation path in the space of images. the resulting discrete paths are indeed local minimizers of the corresponding discrete path energy. A spatial Galerkin discretization with cubic splines on coarse meshes for image deformations and piecewise bilinear finite elements on fine meshes for image intensity functions is used to derive a fully practical algorithm. the method is applied to real images and image variations recorded with a digital camera.

关键词： Image extrapolation Shape space Elastic registration Exponential map

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Energy-Scalable Montgomery-Curve ECDH Key Exchange for ARM Cortex-M3 Microcontrollers

Energy-Scalable Montgomery-Curve ECDH Key Exchange for ARM C...

引用

IEEE international conference on Future Internet of things and Cloud Workshops (FiCloudW)

作者： Christian Franck Johann Großschädl Yann Le Corre Cyrille Lenou Tago University of Luxembourg Computer Science and Communications Research Unit 6 Esch-sur-Alzette Luxembourg

the number of smart devices connected to the Internet is growing at an enormous pace and will reach 30 billion within the next five years. A large fraction of these devices have limited processing capabilities and energy supply, which makes the execution of computation-intensive cryptographic algorithms very costly. this problem is exacerbated by the fact that basic optimization techniques like loop unrolling can not (always) be applied since cryptographic software for the IoT often needs to meet strict constraints on code size to not exceed the program storage capacity of the target device. In this paper we introduce SECCCM3, a "lightweight" software library for scalable elliptic curve cryptography on ARM Cortex-M3 microcontrollers. the current version of SECCCM3 is able to carry out variable-base scalar multiplication on Montgomery-form curves over pseudo-Mersenne prime fields, such as Curve25519, and can be used to implement static ECDH key exchange. SECCCM3 is scalable in the sense that it supports curves of different order (as long as certain conditions are met), thereby enabling trade-offs between security and execution time (resp. energy dissipation). We made an effort to protect the field arithmetic against Timing Attacks (TAs) and Simple Power Analysis (SPA), taking into account the so-called early-termination effect of the Cortex-M3 integer multiplier, which makes the latency of "long" multiply instructions operand-dependent. Our experiments show that the integration of countermeasures against information leakage caused by this effect increases the execution time by 34%, while the code size grows by 13%. A TA and SPA-resistant scalar multiplication on Curve25519 has an execution time of 4.565 million clock cycles and consumes approximately 2.3 mJ of energy when executed on a STM32L152RE Cortex-M3 microcontroller. SECCCM3 has a binary code size of 4.0 kB, which includes domain parameters for curves over 159, 191, 223, and 255-bit prime fields.

关键词： Protocols Elliptic curves Elliptic curve cryptography Random access memory Microcontrollers

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A Simple Method to Obtain Relations among Factor Basis Elements For Special Hyperelliptic Curves 6

A Simple Method to Obtain Relations among Factor Basis Eleme...

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6th IEEE international conference on Computer, Information and Telecommunication Systems (IEEE CITS)

作者： Zhu, Jie Xu, Maozhi Peking Univ LMAM Sch Math Sci Beijing Peoples R China

ISBN: (纸本)9781509059577

the main approach to solve hyperelliptic curve DLP is index calculus algorithm. One of the most important steps is to obtain relations among the factor basis elements. Although Nagao and Joux proposed decomposition methods respectively, their algorithms required solving a multi-variate system of non-linear equations. We propose a new method to find the relations among factor basis elements for a class of special hyperelliptic curves y(2) + y = x(29+1) + A(0) over finite field K with the characteristic 2. Let G(x,y) = R(x) + yT(x) and H(x) be the norm of G(x,y). We prove that supp(div(G(x,y))) subset of supp(div(H(x)). then we show how to obtain relations among factor basis, by solving several linear equations and univariate equations with relatively low degree. Let g be the genus of hyperelliptic curve. After (6g+3)! trials we may obtain a single relation. We also give some examples to illustrate the effectiveness of our algorithm when g = 2,3.

关键词： discrete logarithm problem hyperelliptic curves factor basis

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discrete Modeling of Oscillatory Processes in a Blocky Medium 6th

Discrete Modeling of Oscillatory Processes in a Blocky Mediu...

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6th international conference on Numerical Analysis and Applications (NAA)

作者： Sadovskii, Vladimir M. Chentsov, Evgenii P. RAS SB Inst Computat Modeling Akademgorodok 50-44 Krasnoyarsk 660036 Russia

ISBN: (纸本)9783319570990;9783319570983

Resonance phenomena in inhomogeneous layered and blocky media are investigated on the basis of the discrete model of transverse-rotational oscillations in linear monoatomic chain. To analyze the behavior of the system in near-resonance region, spectral portraits are built. It allows to visualize resonant frequencies and to analyze alteration of an amplitude vector. Using mentioned model, a set of resonant frequencies are found. It is shown that there exists one specific frequency, which does not depend on the number of particles in the chain. In passing to the limit as the chain length tends to infinity, this frequency, related to rotational particles vibration, is the unique resonant frequency. the discussed property is associated with the previously studied property of the Cosserat continuum, where the resonant frequency of rotational motion exists, which does not depend on the specimen size and on the conditions of loading at its boundary.

关键词： Microstructure Elasticity Resonance discrete chain Cosserat continuum Blocky medium Rotational motion

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CARIC: A Novel Modeling of Combinatorial Approach for Radiological Image Compression 1

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6th Computer Science On-Line conference (CSOC)

作者： Lakshminarayana, M. Sarvagya, Mrinal Visvesvaraya Technol Univ Dept ECE Belgaum India REVA Univ Sch ECE Bangalore Karnataka India

ISBN: (数字)9783319572642

ISBN: (纸本)9783319572642

the contribution of several compression algorithms plays a significant role in minimizing the size of multiple radiological images from last decade. However, a closer look into existing work will show that there is a big trade-off between compression performance and data quality during the reconstruction process. We review the existing research work being carried out and briefs such problems and trade-off. this paper presents a framework called as CARIC (Combinatorial Approach for Radiological Image Compression) that uses a combinatorial approach of both lossy and lossless compression schemes unique in any radiological image. Using maximum numbers and modalities of different radiological images, we also compare CARIC with some recent and relevant work of compression to find that CARIC offers better image compression ratio along with a great balance among quality of the reconstructed image and faster response time.

关键词： Compressive sensing Compression ratio discrete Wavelet Transform Medical images Peak Signal-to-Noise Ratio Radiological image

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discrete model for out-of-plane loaded random masonry 6

Discrete model for out-of-plane loaded random masonry

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6th international conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2017

作者： Baraldi, D. Reccia, Emanuele Cecchi, A. Università IUAV di Venezia DACC Department of Architecture Construction Conservation Terese Dorsoduro 2206 Venice30123 Italy

ISBN: (纸本)9786188284418

In this contribution, a simple and effective discrete element model based on rigid blocks and elastic interfaces with fixed contact topology, originally introduced for modeling regular masonry panels, is extended to the case of random masonry by introducing a perturbation parameter able to vary the width of each block. the proposed model is then able to better reproduce the microstructural behavior of historical masonry, that is characterized by dry or weak mortar joints between strong blocks, and, in particular, that is characterized by blocks often arranged irregularly. the hypothesis of rigid blocks, together with fixed contact topology between blocks due to the small displacements assumption, allows adopting an efficient solution method based on the determination of the stiffness matrix of the masonry assemblage. In this case, the stiffness matrix is able to account for the irregular block arrangement and, similarly to the case of regular masonry, the stiffness matrix is based on local joint stiffness, given that the contact actions along the joints are function of the relative displacements between adjacent blocks and the corresponding interface stiffness. Several numerical tests varying the random perturbation parameter are performed in order to evaluate the influence of randomness on masonry specimen behavior with respect to the regular case. Particular attention is given to the dynamic field by performing out-of-plane modal analysis of masonry panels. Furthermore, a homogenization procedure is applied to the random masonry and a numerical evaluation of the scatter between the discrete models and a 2D Reissner-Mindlin plate model is performed for varying perturbation parameter and for increasing heterogeneity parameter. As expected, when the number of heterogeneities in the structure is large enough, the average response of the random discrete model converges to an asymptotic response.

关键词： Modal analysis

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Numerical Method for Solving an Inverse Boundary Problem with Unknown Initial Conditions for Parabolic PDE Using discrete Regularization 6th

Numerical Method for Solving an Inverse Boundary Problem wit...

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6th international conference on Numerical Analysis and Applications (NAA)

作者： Yaparova, Natalia M. Natl Res Univ South Ural State Univ Dept Computat Math & High Performance Comp Pr Lenin 76 Chelyabinsk 454080 Russia

ISBN: (纸本)9783319570990;9783319570983

We consider an inverse boundary values problem for parabolic PDE with unknown initial conditions. In this problem both Dirichlet and Neumann boundary conditions are given on a part of the boundary and it is required to determine the corresponding function on the remaining part of the boundary. To solve this problem, the numerical method based on finite difference schemes and regularization technique is proposed. the computing scheme involves solving the equation for each spatial step that allows to obtain the numerical solution in internal points of the domain and on the boundary. We prove a conditional stability of the method. the reliability and the efficiency of the method were confirmed by computational results.

关键词： Heat conduction problem Inverse problem Regularization method Computational scheme Conditional stability

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Generation of cancelable iris template using Bi-level transformation 17

Generation of cancelable iris template using Bi-level transf...

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6th international conference on Bioinformatics and Biomedical Science, ICBBS 2017

作者： Punithavathi, P. Geetha, S. Sasikala, S. School of Computing Science and Engineering VIT University Chennai Campus Vandalur-Kelambakkam Road Chennai Tamil Nadu India Department of Information Technology K. L. N. College of Information Technology Madurai India

ISBN: (纸本)9781450352222

Cancelable biometric system is a transformation technique for securing biometric templates. this work proposes application of bi-level template securing technique at feature-level, and generates revocable templates. the bi-level transformation includes discrete Fourier Transform and partial Hadamard based transformations on iris features, using user-specific key. the proposed bi-level transformation applied at feature-level provides better robustness and security against correlation attacks. A comprehensive analysis has been performed on the proposed approach to study the non-invertibility, diversity, revocability and matching performance on iris samples. the experimental results show that the proposed approach is promising, and deliver good performance. © 2017 Association for Computing Machinery.

关键词： discrete Fourier transforms

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