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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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Weakness of double-struck F36.509 for discrete logarithm cryptography

Weakness of double-struck F36.509 for discrete logarithm cry...

引用

6th international conference on Pairing-Based Cryptography, Pairing 2013

作者： Adj, Gora Menezes, Alfred Oliveira, thomaz Rodríguez-Henríquez, Francisco Computer Science Department CINVESTAV-IPN Mexico Department of Combinatorics and Optimization University of Waterloo Canada

In 2013, Joux, and then Barbulescu, Gaudry, Joux and thomé, presented new algorithms for computing discrete logarithms in finite fields of small and medium characteristic. We show that these new algorithms render the finite field double-struck F36.509 = double-struck F33054 weak for discrete logarithm cryptography in the sense that discrete logarithms in this field can be computed significantly faster than with the previous fastest algorithms. Our concrete analysis shows that the supersingular elliptic curve over double-struck F3509 with embedding degree 6 that had been considered for implementing pairing-based cryptosystems at the 128-bit security level in fact provides only a significantly lower level of security. Our work provides a convenient framework and tools for performing a concrete analysis of the new discrete logarithm algorithms and their variants. © 2014 Springer international Publishing.

关键词： Concretes

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A MANUFACTURABILITY-BASED MEthOD OF TOPOLOGICAL SHAPE OPTIMIZATION FOR STRUCTURES UNDER MULTIPLE LOADING CASES 11

A MANUFACTURABILITY-BASED METHOD OF TOPOLOGICAL SHAPE OPTIMI...

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11th World Congress on Computational Mechanics (WCCM) / 5th European conference on Computational Mechanics (ECCM) / 6th European conference on Computational Fluid Dynamics (ECFD)

作者： Li, Hao Gao, Liang Zhang, Li Wu, Tao Huazhong Univ Sci & Technol Sch Mech Sci & Engn Wuhan 430074 Hubei Peoples R China Huazhong Univ Sci & Technol Sch Software Engn Wuhan 430074 Hubei Peoples R China

ISBN: (纸本)9788494284472

Considering the manufacturability during the design phase, this paper proposes a level set-based method for the optimal design of extrudable structures under multiple loading cases. Firstly, the level set model is used to describe the moving structural boundary as the embedded zero level set. To avoid the mathematically solving of the difficult Hamilton-Jacobi equation, the compactly supported radial basis function (CSRBF) as well as the discrete wavelet transform (DWT) are introduced to transform the standard level set method into a parametric one, to which several well-established gradient-based algorithms can be applied. Besides, the linear system for the interpolation is extremely sparse in our study, which will guarantee the computational efficiency. Secondly, the multi-objective optimization considering different loading cases is formulated by a normalized exponential weighted criterion (NEWC) method. the NEWC is used to depict the entire Pareto set on both convex and non-convex Pareto frontier. thirdly, a cross section projection strategy is utilized to satisfy the extrusion constraint and reduce the computational cost. Several numerical examples in 3D are provided to show the efficiency of the proposed method. the results verify this method can achieve a manufacturable design using lower computer effort.

关键词： Topological Shape Optimization Manufacturability Extrusion Level Set discrete Wavelet Transform

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Robust LMI Stability of a Premium Pricing Model into a discrete-Time Stochastic Framework 2

Robust LMI Stability of a Premium Pricing Model into a Discr...

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2nd international conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th international Symposium on Uncertainty Modeling and Analysis, ISUMA 2014

作者： Pantelous, Athanasios A. Yang, Lin Institute for Financial and Actuarial Mathematics Department of Mathematical Sciences University of Liverpool LiverpoolL697ZL United Kingdom

ISBN: (纸本)9780784413609

the premium pricing process and the stability of the reserves are two very challenging issues in the insurance industry. In practice, a premium which is sufficient enough to cover the expected claims and to stabilize the derived reserves is always required. this paper proposes a premium pricing model for general insurance products which implements a negative feedback mechanism for the known reserves with time-varying, bounded delays and is based on the recent claim experience into a stochastic framework with norm-bounded parameter uncertainties. the robust stability for the reserve process is investigated using Linear Matrix Inequality (LMI) criteria in a discrete-time stochastic framework. A numerical example illustrates the main result of the paper. © 2014 American Society of Civil Engineers.

关键词： Linear matrix inequalities

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the Use of GPGPU in Continuous and discrete Models of Crowd Dynamics 1

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10th international conference on Parallel Processing and applied mathematics (PPAM)

作者： Mroz, Hubert Was, Jaroslaw Topa, Pawel Univ Sci & Technol AGH PL-30059 Krakow Poland

ISBN: (数字)9783642551956

ISBN: (纸本)9783642551956

the aim of the study is twofold: firstly to compare the possibilities of using GPGPU (General-Purpose Computing on Graphics Processing Units) in continuous and discrete crowd dynamics simulation, secondly to draw conclusions on the applicability of GPUs in engines of professional crowd simulations. For this purpose the authors have implemented two models of pedestrian dynamics: continuous - Social Forces model and discrete, Cellular Automata based - Social Distances model. the presented simulations refer to outdoor, large area pedestrian movement.

关键词： Crowd simulations Crowd models GPU GPGPU

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A Texture based approach to Word-level Script Identification from Multi-script Handwritten Documents 6

A Texture based approach to Word-level Script Identification...

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6th international conference on Computational Intelligence and Communication Networks

作者： Singh, Pawan Kumar Khan, Aparajita Sarkar, Ram Nasipuri, Mita Jadavpur Univ Dept Comp Sci & Engn Kolkata India

ISBN: (纸本)9781479969296

Script identification from handwritten document images is an open document analysis problem especially for multilingual environment like India. To design the Optical Character Recognition (OCR) system for multi-script document pages, it is essential to recognize different scripts prior to employing an OCR engine of a particular script. the present work describes a texture based approach to word-level script identification from five handwritten scripts namely, Malayalam, Oriya, Tamil, Telugu and Roman. A 92-element feature vector has been designed in which 80 features consists of selected coefficients of discrete Cosine Transform (DCT) and the remaining 12 features have been taken from the Moment invariants. Experimentations are conducted on a database consisting of 1000 word images of each script which are evaluated using multiple classifiers. the Multi Layer Perceptron (MLP) classifier is found to be a best choice for the said purpose which is then applied comprehensively using different cross-validation folds and different epoch sizes. the average success rate for the present technique of word-level handwritten script identification is found to be 93.56% for 5-fold cross validation with epoch size 1000, which is quite encouraging.

关键词： Script Identification Handwritten Documents discrete Cosine Transform Moment invariant Multiple classifiers

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A discrete-time Geo/G/1 retrial queue with preemptive resume, Bernoulli feedback and general retrial times 6

A discrete-time Geo/G/1 retrial queue with preemptive resume...

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6th international conference on Fuzzy Information and Engineering, ICFIE 2012 and 6th academic conference from Fuzzy Information and Engineering Branch of Operation Research Society of China, FIEBORSC 2012

作者： Wei, Cai-Min Qin, Yi-Yan He, Lu-Xiao Department of Mathematics Shantou University Shantou515063 China College of Business Guangxi University for Nationalities Nanning530006 China

ISBN: (纸本)9783642386664

In this work, we consider a discrete-time Geo/G/1 retrial queue with preemptive resume, Bernoulli feedback and general retrial *** analyze theMarkov chain underlying the considered queueing system and derive the generating functions of the system state, the orbit size and the system size distribution. Using probability generating function technique, some interesting and important performance measures are obtained. We also investigate the stochastic decomposition property and present some numerical examples. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Stochastic systems

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6th international conference on Soft Computing and Pattern Recognition, SoCPaR 2014

6th International Conference on Soft Computing and Pattern R...

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6th international conference on Soft Computing and Pattern Recognition, SoCPaR 2014

ISBN: (纸本)9781479959341

the proceedings contain 81 papers. the topics discussed include: variable hierarchical dependencies in feature selection;bi-spectrum based-EMD applied to the non- stationary vibration signals for bearing faults diagnosis;wireless landmines tracking system based on GPS and GPRS;performance of curvelets, dual-tree complex wavelet and discrete wavelet transform in handwritten word classification;possibility theory for supervised classification of remotely sensed images: a study case in an urban area in Algeria;proposition of a classification system beta-LS-SVM and its application to medical data sets;topological and textural features for off-line signature verification based on artificial immune algorithm;supervised wavelet-network based fuzzy-logic classifier performance on the UCI databases;scintigraphic image segmentation based on grammatical inference and spiral matrix;and microcalcifications detection in mammograms based on ant colony optimization and Markov random field.

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Using discrete Wavelet Transform to Analyze Quasi-Stationary three-Phase Systems

Using Discrete Wavelet Transform to Analyze Quasi-Stationary...

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16th international conference on Harmonics and Quality of Power (ICHQP)

作者： Nicolae, Ileana-Diana Nicolae, Petre-Marian Popa, Lucian-Dinut Univ Craiova Dept Comp & Informat Technol Craiova Romania Univ Craiova Dept Elect Energet & Aero Spatial Engn Craiova Romania

ISBN: (纸本)9781467364874

the paper deals with the discrete Wavelet Transform (DWT) analysis of quasi-stationary regimes (with small variations of magnitude and harmonic contents) in three-phase systems. the analyzed data, acquired on stand, correspond to a driving system using chopper and DC motor. Unfiltered currents are included in the first data set, unlike those from the second set. the harmonic orders to be filtered (5,7,11,13 etc.) were determined using a FFT analysis. 10 levels decompositions using DWT were made, using Daubechy filters of length 8, implemented by 2 functions. "dwm" assumes that the analyzed signal is periodic, whilst "dwi" performs interpolations to estimate the first 6 values of the decomposed signal beyond its right edge. During analysis, FFT is applied over one period P, whilst DWT operates over 6 consecutive periods starting with P. the analysis concerns instantaneous and global power quality related quantities and provides possible explanations for the cases when differences appear between the results yielded by the various analyzed methods.

关键词： discrete wavelet transforms Harmonic distortion Power quality Signal processing algorithms

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the special number field sieve in double-struck Fpn: Application to pairing-friendly constructions

The special number field sieve in double-struck Fpn: Applica...

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6th international conference on Pairing-Based Cryptography, Pairing 2013

作者： Joux, Antoine Pierrot, Cécile CryptoExperts France Cryptologie de la Fondation de l'UPMC 4 place Jussieu 75005 Paris France Université de Versailles Saint-Quentin Laboratoire PRISM 45 avenue des États-Unis 78000 Versailles France UPMC Univ. Paris 06 LIP6 France INRIA Paris-Rocquencourt Center PolSys Project France CNRS UMR 7606 LIP6 France

In this paper, we study the discrete logarithm problem in finite fields related to pairing-based curves. We start with a precise analysis of the state-of-the-art algorithms for computing discrete logarithms that are suitable for finite fields related to pairing-friendly constructions. To improve upon these algorithms, we extend the Special Number Field Sieve to compute discrete logarithms in double-struck Fpn, where p has an adequate sparse representation. Our improved algorithm works for the whole range of applicability of the Number Field Sieve. © 2014 Springer international Publishing.

关键词： Sieves

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Proceedings - 2013 6th international conference on Business Intelligence and Financial Engineering, BIFE 2013

Proceedings - 2013 6th International Conference on Business ...

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6th international conference on Business Intelligence and Financial Engineering, BIFE 2013

ISBN: (纸本)9781479947775

the proceedings contain 142 papers. the topics discussed include: the duplication-loss problem: novel algorithms based on k-NNI local search;research on reefs extraction method based on multi-spectral remote sensing;a modified recursive probabilistic velocity obstacles model for multi-agent navigation;the research of modeling method about underwater vehicle penetration threaten viewsheds space;a trend tracking strategy for gold future: an artificial neutral network analysis;development of international standard ENC validation check platform;a dynamic programming algorithm for unsigned (1,2)-exemplar breakpoint distance problem with span constraint;a consensus reaching model for collaborative decision making in web 2.0 communities;the study of culture sharing project based on cloud computing;evaluation model based on support vector machine for community micro-blog influence;and coupling firefly algorithm and least squares support vector regression for crude oil price forecasting.

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