检索结果-内蒙古大学图书馆

arXiv 2017年

作者： Shi, Minjia Zhang, Zhongyi Solé, Patrick Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University No. 3 Feixi Road Hefei Anhui Province230039 China School of Mathematical Sciences Anhui University Hefei230601 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China School of Wendian Anhui University Hefei Anhui230601 China CNRS/LAGA University of Paris 8 2 rue de la Liberté Saint-Denis93 526 France

The cyclic codes with parity check polynomial the reciprocal of the characteristic polynomial of the Fibonacci recurrence over a prime finite field are shown to have either one weight or two weights. When these codes are irreducible cyclic we obtain many counterexamples to the conjectural classification of two-weight irreducible cyclic codes of Schmidt and White (2002). When they are reducible and projective their duals are uniformly packed. Copyright © 2017, The Authors. All rights reserved.

关键词： Number theory

来源：评论

学校读者我要写书评

暂无评论

Constructions of optimal LCD codes over large finite fields

arXiv

引用

arXiv 2017年

作者： Sok, Lin Shi, Minjia Solé, Patrick School of Mathematical Sciences Anhui University Hefei Anhui230601 Department of Mathematics Royal University of Phnom Penh Cambodia Key Laboratory of Intelligent Computing Signal Processing Ministry of Education Anhui University No.3 Feixi Road Hefei Anhui230039 China School of Mathematical Sciences Anhui University HefeiAnhui230601 China National Mobile Communications Research Laboratory Southeast University China CNRS/LAGA University of Paris 8 Saint-Denis93 526 France

In this paper, we prove existence of optimal complementary dual codes (LCD codes) over large finite fields. We also give methods to generate orthogonal matrices over finite fields and then apply them to construct LCD codes. Construction methods include random sampling in the orthogonal group, code extension, matrix product codes and projection over a self-dual basis. Copyright © 2017, The Authors. All rights reserved.

关键词： Matrix algebra

来源：评论

学校读者我要写书评

暂无评论

An Improved Heuristic Method for Subgraph Isomorphism Problem

引用

IOP Conference Series: Materials Science and Engineering 2017年第1期231卷

作者： Yingzhuo Xiang Jiesi Han Haijiang Xu Xin Guo National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China Jiangnan Institute of Computing Technology Wuxi China School of Mathematical Sciences of UESTC Chengdu China

This paper focus on the subgraph isomorphism (SI) problem. We present an improved genetic algorithm, a heuristic method to search the optimal solution. The contribution of this paper is that we design a dedicated crossover algorithm and a new fitness function to measure the evolution process. Experiments show our improved genetic algorithm performs better than other heuristic methods. For a large graph, such as a subgraph of 40 nodes, our algorithm outperforms the traditional tree search algorithms. We find that the performance of our improved genetic algorithm does not decrease as the number of nodes in prototype graphs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Multi-view Metric Learning for Multi-view Video Summarization

Multi-view Metric Learning for Multi-view Video Summarizatio...

引用

International Conference on Cyberworlds

作者： Linbo Wang Xianyong Fang Yanwen Guo Yanwei Fu MOE Key Laboratory of Intelligent Computing and Signal Processing Anhui University Hefei China National Key Laboratory for Novel Software Technology Nanjing University Nanjing China School of Data Science Fudan University China

Traditional methods on video summarization are designed to generate summaries for single-view video records, and thus they cannot fully exploit the mutual information in multi-view video records. In this paper, we present a multiview metric learning framework for multi-view video summarization. It combines the advantages of maximum margin clustering with the disagreement minimization criterion. The learning framework thus has the ability to find a metric that best separates the input data, and meanwhile to force the learned metric to maintain underlying intrinsic structure of data points, for example geometric information. Facilitated by such a framework, a systematic solution to the multi-view video summarization problem is developed from the viewpoint of metric learning. The effectiveness of the proposed method is demonstrated by experiments.

关键词： Extraterrestrial measurements Optimization Manifolds Visualization Minimization Eigenvalues and eigenfunctions

来源：评论

学校读者我要写书评

暂无评论

Efficient In SAR phase noise reduction via total variation regularization

引用

Science China(Information Sciences) 2015年第8期58卷 64-76页

作者： LUO XiaoMei WANG XiangFeng SUO ZhiYong LI ZhenFang State Key Laboratory of Integrated Services Networks Xidian University Department of Electronic Information Engineering Nanchang University Shanghai Key Laboratory of Trustworthy Computing Software Engineering InstituteEast China Normal University National Laboratory of Radar Signal Processing Xidian University

We consider the phase noise filtering problem for Interferometric Synthetic Aperture Radar(In SAR)using a total variation regularized complex linear least squares formulation. Although the original formulation is convex, solving it directly with the standard CVX package is time consuming due to the large problem size. In this paper, we introduce the effective and efficient alternating direction method of multipliers(ADMM) to solve the equivalent well-defined complex formulation for the real and imaginary parts of the optimization *** the iteration complexity and the computational complexity of the ADMM are established in the forms of theorems for our In SAR phase noise problem. Simulation results based on simulated and measured data show that this new In SAR phase noise reduction method not only is 3 orders of magnitude faster than the standard CVX solver, but also has a much better performance than the several existing phase filtering methods.

关键词： interferometric synthetic aperture radar phase noise reduction total variation regularization least squares formulation alternat

来源：评论

学校读者我要写书评

暂无评论

Robust face recognition with locality-sensitive sparsity and group sparsity constraints 8th

Robust face recognition with locality-sensitive sparsity and...

引用

8th International Conference on Image and Graphics, ICIG 2015

作者： Sun, Xi Chan, Wentao Qu, Lei Key Laboratory of Intelligent Computing and Signal Processing Anhui University Hefei230039 China

ISBN: (纸本)9783319219684

In this paper, we present a robust face recognition method with combined locality-sensitive sparsity and group sparsity constraint. The group sparsity constraint is designed to utilize the grouped structure information embedded in the training data. Its key idea is to try representing the test image with training images from fewer individuals. We show that, by further integrating the local similarity information between the test image and training images, the embedded group structure information can be better utilized, and as result, the recognition performance can be significantly improved. Experimental results on the ORL, AR and Extended Yale B database verify the superiority of our proposed method under different pose, illumination, expression variations and different dimension reduction settings. © Springer International Publishing Switzerland 2015.

关键词： Face recognition

来源：评论

学校读者我要写书评

暂无评论

Designing and optimizing of surface plasmonic waveguide with nonlinear media

引用

Guangzi Xuebao/Acta Photonica Sinica 2016年第2期45卷 0224002-1-0224002-1-0224002-5页

作者： Wang, Li-Hua Huang, Zhi-Xiang Kuang, Xiao-Jing Wu, Xian-Liang Key Laboratory of Intelligent Computing & Signal Processing Anhui University Hefei230039 China

A kind of hybrid surface plasmonic waveguide based on the nonlinear media of Si-NC/SiO2 was designed. The dependence of the distribution of longitudinal energy flux density, the effective refractive index, the propagation length and the effective area of the fundamental mode of the waveguide, on the geometrical parameters and the nonlinear volume fraction were analyzed by the finite element method. Simulated results reveal that light field is distributed mainly in the nonlinear material. The transmission parameters of the fundamental mode, such as the effective index and propagation length can be adjusted by tuning the size and the volume fraction of nonlinear material. When the volume fraction is given, the effective index and propagation length will increase as the thickness of the nonlinear material increasing. With a certain geometric parameter, the effective index will increase as the volume fraction increasing, the propagation length and the effective area will decrease. Finally, the nonlinear effect was optimized according to the analysis results, and the optimized structure size is given by that, the width of waveguide is 250 nm, the thickness of the nonlinear material layer and silicon layer is 100 nm and 150 nm respectively. © 2016, Science Press. All right reserved.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Tolerance Granulation Based Community Detection Algorithm

引用

Tsinghua Science and Technology 2015年第6期20卷 620-626页

作者： Shu Zhao Wang Ke Jie Chen Feng Liu Menghan Huang Yanping Zhang Jie Tang Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education Center of Information Support & Assurance TechnologySchool of Computer Science and TechnologyAnhui University School of Computer Science and Technology Tsinghua University

Community structure is one of the most important features in real networks and reveals the internal organization of the vertices. Uncovering accurate community structure is effective for understanding and exploiting networks. Tolerance Granulation based Community Detection Algorithm(TGCDA) is proposed in this paper, which uses tolerance relation(namely tolerance granulation) to granulate a network hierarchically. Firstly, TGCDA relies on the tolerance relation among vertices to form an initial granule set. Then granules in this set which satisfied granulation coefficient are hierarchically merged by tolerance granulation operation. The process is finished till the granule set includes one granule. Finally, select a granule set with maximum granulation criterion to handle overlapping vertices among some granules. The overlapping vertices are merged into corresponding granules based on their degrees of affiliation to realize the community partition of complex networks. The final granules are regarded as communities so that the granulation for a network is actually the community partition of the *** on several datasets show our algorithm is effective and it can identify the community structure more accurately. On real world networks, TGCDA achieves Normalized Mutual Information(NMI) accuracy 17.55% higher than NFA averagely and on synthetic random networks, the NMI accuracy is also improved. For some networks which have a clear community structure, TGCDA is more effective and can detect more accurate community structure than other algorithms.

关键词： tolerance relation community tolerance granulation

来源：评论

学校读者我要写书评

暂无评论

Comparative analysis of identification methods for wheat leaf diseases

引用

International Agricultural Engineering Journal 2016年第3期25卷 197-203页

作者： Zhang, D.Y. Xie, X.H. Liang, D. Huang, L.S. Zhang, X.Q. Teng, L. Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei230039 China Anhui Engineering Laboratory of Agro-Ecological Big Data Anhui University School of Electronic and Information Engineering Hefei Anhui230601 China

How to fast, accurately and robustly recognize wheat diseases, particularly for those diseases with mild-to-moderate severity, is a challenge for prevention and control of crop disease timely. In this study, image processing technique was applied to segment the infected regions of disease leaves. Twenty disease features were extracted, and eighteen larger weight features were selected by Relief-F algorithm to generate the models of Support Vector Machine (SVM), Relevance Vector Machine (RVM) and Back Propagation Neural Network (BPNN). Subsequently, these models were used to identify two kinds of wheat diseases, namely, wheat stripe rust and powdery mildew. Total 136 samples, including 68 training samples and 68 test samples with different infection severities were used to study the recognition capabilities of the three models. Results showed that high predictive accuracies in identification of two wheat diseases with varying severity for all three models. Overall accuracy of RVM was 89.71%, which was superior to 83.82% of SVM and inferior to 92.64% of BPNN. Meanwhile, the recognition accuracies of SVM, RVM and BPNN models for mild-to-moderate disease were 83.33%, 88.33% and 91.67%, respectively. The prediction time of RVM was less than those of SVM and BPNN, with differences as large as 7.96 and 31.68 times, respectively. Therefore, RVM appeared to be the most suitable for real-time identifying wheat leaf diseases among the three models, which can provide important technical support for wheat diseases management.

关键词： Support vector machines

来源：评论

学校读者我要写书评

暂无评论

Research on the transmission enhancement properties of a novel subwavelength grating structure and mechanism

Research on the transmission enhancement properties of a nov...

引用

AASRI International Conference on Applied Engineering Science, ICAES 2014

作者： Chang, H.X. Li, M.Q. Zhang, S. Ding, Y. Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China

ISBN: (纸本)9781138026490

The subwavelength metal grating is designed and simulated by using the finite difference time domain (FDTD) algorithm. The transmission characteristics of subwavelength metal grating structure are studied based on the Lossy Drude dispersive medium model. The influence of grating geometry parameters on the transmission characteristics are analyzed, especially for the zero transmission point location of the spectrum. The difference between the designed and conventional gratings is that the former introduces the resonant cavity. Results show that, compared with the single-layer grating, the triple-layer grating has a better filtering effect, and the transmission spectrum peak is in excess of 82%. It concludes that the transmission peak drift is analyzed by using the waveguide Fabry-Perot (F-P) cavity resonance effect, and the zero transmission point location of the spectrum is independent of the metal layer thickness. The influence rules provide an available reference for the design of the band-pass filters. © 2015 Taylor & Francis Group, London.

关键词： Bandpass filters

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：