检索结果-内蒙古大学图书馆

2009 WRI World Congress on computer science and Information Engineering, CSIE 2009

作者： Zhijie, Xu Jianqin, Zhang Xiwu, Dai School of Science Beijing University of Civil Engineering and Architecture Beijing 100044 China Institute of Geographical Sciences and Natural Resources Research State Key Lab. of Resources and Environmental Information System Beijing 100044 China

ISBN: (纸本)9780769535074

In this paper we address the problem of identifying the similarity measure for face recognition. The similarity measure plays an important role in pattern classification. However, with reference to 2D image matrix based methods for face recognition, such as two dimensional principal component analysis (2DPCA), where the features extracted are matrixes instead of single vectors, studies on the similarity measure are quite few. We propose a new method to identify the similarity measure by boosting, which is called boosted similarity measure. Experimental results on two famous face databases show that generally the proposed method outperforms the state of the art methods. © 2008 IEEE.

关键词： Face recognition

来源：评论

学校读者我要写书评

暂无评论

CED: A community-based event delivery protocol in publish/subscribe systems for Delay Tolerant Sensor Network (DTSN)

CED: A community-based event delivery protocol in publish/su...

引用

38th International Conference on Parallel Processing, ICPP-2009

作者： Zhu, Jinqi Liu, Ming Cao, Jiannong Chen, Guihai Gong, Haigang Xu, Fulong Dept. of Computer Science and Engineering University of Electronic Science and Technology of China Cheng du China Internet and Mobile Computing Lab. Department of Computing Hong Kong Polytechnic University Hong Kong State Key Laboratory for Novel Software Technology Nanjing University China

ISBN: (纸本)9780769538020

The basic operation of Delay Tolerant Sensor Network (DTSN) is to finish pervasive data gathering in networks with intermittent connectivity, while the publish/subscribe (Pub/Sub for short) paradigm is used to deliver events from a source to interested clients in an asynchronous way. Recently, to extend a Pub/Sub system in DTSN has become a promising topic. However, due to the unique characteristic of frequent partitioning in DTSN, to extend a Pub/Sub system in DTSN is a considerably difficult and challenging problem, and there is no good solution to it in existing works. To adapt Pub/Sub systems to DTSN, we propose CED, a community-based event delivery protocol. In our design, event delivery is based on several unchanged communities, which are formed by sensor nodes in the network according to their connectivity. CED consists of two components: Event delivery and queue management. In event delivery, events in a community are delivered to mobile subscribers once a subscriber comes into the community, for improving the data delivery ratio. The queue management employs both the event successful delivery time and the event survival time to decide whether an event should be delivered or dropped for minimizing the transmission overhead. The effectiveness of CED is demonstrated through comprehensive simulation studies. © 2009 IEEE.

关键词： Sensor nodes

来源：评论

学校读者我要写书评

暂无评论

Face image modeling by multilinear subspace analysis with missing values 09

Face image modeling by multilinear subspace analysis with mi...

引用

17th ACM International Conference on Multimedia, MM'09, with Co-located Workshops and Symposiums

作者： Geng, Xin Smith-Miles, Kate Zhou, Zhi-Hua Wang, Liang School of Mathematical Sciences Monash University VIC 3800 Australia School of Computer Science and Engineering Southeast University Nanjing 210096 China National Key Lab. for Novel Software Technology Nanjing University Nanjing 210093 China Dept. of Computer Science and Software Eng. University of Melbourne VIC 3010 Australia

ISBN: (纸本)9781605586083

The main difficulty in face image modeling is to decompose those semantic factors contributing to the formation of the face images, such as identity, illumination and pose. One promising way is to organize the face images in a higher-order tensor with each mode corresponding to one contributory factor. Then, a technique called Multilinear Subspace Analysis (MSA) is applied to decompose the tensor into the mode-n product of several mode matrices, each of which represents one semantic factor. In practice, however, it is usually difficult to obtain such a complete training tensor since it requires a large amount of face images with all possible combinations of the states of the contributory factors. To solve the problem, this paper proposes a method named M2SA, which can work on the training tensor with massive missing values. Thus M2SA can be used to model face images even when there are only a small number of face images with limited variations which will cause missing values in the training tensor). Experiments on face recognition show that M2SA can work reasonably well with up to 70% missing values in the training tensor. Copyright 2009 ACM.

关键词： Tensors

来源：评论

学校读者我要写书评

暂无评论

Motion estimation for a mobile robot based on real-time stereo vision system

Motion estimation for a mobile robot based on real-time ster...

引用

2009 2nd International Congress on Image and Signal Processing, CISP'09

作者： Zhongli, Wang Xueshan, Gao Baochang, Zhang Hao, Wu State Key Lab. of Robotics and System Harbin Institute of Technology Harbin China School of Computer Science Beijing Institute of Technology Beijing China Intelligent Robotics Institute Beijing Institute of Technology Beijing China School of Automation Science and Electric Engineering Beihang University Beijing China

ISBN: (纸本)9781424441310

Vision-based motion estimation is a key technique in autonomously mobile robot. This paper presents an integrated method for motion estimation of the mobile robot based on floor plane extraction. The whole processes include floor plane extraction, pose estimation of the onboard stereo vision system and motion estimation of the mobile robot. First, based on disparity map obtained from the onboard real-time stereo vision system, a two-stage method is used for fast floor plane extraction. Then all the points belong to the floor plane are transformed from disparity space to Euclidean space, and a simple least squares method is employed to fit the floor plane. The fitting parameters of the floor plane are used for the pose estimation of the onboard stereo vision system. Finally, the motion of the mobile robot is estimated with the tracking results of the points on floor plane. The proposed motion estimation method is intended to be used in the motion control of a wheeled mobile robot. Experimental results in real environments are presented. ©2009 IEEE.

关键词： Mobile robots

来源：评论

学校读者我要写书评

暂无评论

An adaptive physically-based deformation on distance fields

引用

Journal of Information and Computational science 2009年第6期6卷 2263-2270页

作者： Wu, Xiaoxiao Liang, Xiaohui Xu, Qidi State Key Lab. of Virtual Reality Technology School of Computer Science Beihang University Beijing 100191 China

This paper presents a novel adaptive deformation algorithm by integrating the representations of ADFs and physically based deformable models. The octree-based adaptively sampled distance fields (ADFs) are employed as the shape representation. The deformation of the ADFs is governed by the principle of physical dynamics and achieved by manipulating the scalar fields directly. A dynamic adaptive resampling scheme for ADFs is used during deformations. The physically based model of mass-spring is integrated into irregular fields for deformation. The stiffness of the non-uniform springs in the system is adaptive to spatial resolution of ADFs to avoid non-homogeneity in physics caused by the irregular structure. The results show that our physically based deformation algorithm based on the representation of ADFs outperforms regular sampled distance field based deformation algorithm in terms of time and memory efficiency, and has potential applications in physically-based interactive sculpting. © 2009 Binary Information Press.

关键词： Deformation

来源：评论

学校读者我要写书评

暂无评论

A novel clustering algorithm based on multi-sampling max-min distance and dynamic tunneling method

引用

Journal of Information and Computational science 2009年第2期6卷 637-642页

作者： Lv, Jia Chongqing Key Lab. of Operations Research and System Engineering College of Mathematics and Computer Science Chongqing Normal University Chongqing 400047 China

In view of the limitations that k-means clustering algorithm is sensitive to the initial points and liable to fall into local minimum point, a clustering algorithm based on multi-sampling max-min distance and dynamic tunneling method is proposed. In this algorithm, max-min distance approach combined with multi-sampling technology is used to choose the starting cluster centers optimally, and dynamic tunneling method, whose feature is its ability to search global optimum solution, is applied to skip through local minima of objective function via drilling tunnel. It is proved validity and feasibility by experiment. Copyright ©2009 Binary Information Press.

关键词： Global optimization

来源：评论

学校读者我要写书评

暂无评论

Program Verification by Reduction to Semi-algebraic systems Solving

Communications in Computer and Information Science

引用

Communications in computer and Information science 2009年 17卷 277-291页

作者： Xia, Bican Yang, Lu Zhan, Naijun LMAM and School of Mathematical Sciences Peking University China Shanghai Key Lab. of Trustworthy Computing East China Normal University China Lab. of Computer Science Institute of Software Chinese Academy of Sciences China

ISBN: (纸本)9783540884781

The discovery of invariants and ranking functions plays a central role in program verification. In our previous work, we investigated invariant generation and non-linear ranking function discovering of polynomial programs by reduction to semi-algebraic systems solving. In this paper we will first summarize our results on the two topics and then show how to generalize the approach to discovering more expressive invariants and ranking functions, and applying to more general programs. © Springer-Verlag Berlin Heidelberg 2008.

关键词： Algebra

来源：评论

学校读者我要写书评

暂无评论

Construct pairwise test suites based on the Bak-Sneppen model of biological evolution

引用

World Academy of science, Engineering and Technology 2009年 35卷 224-229页

作者： Yuan, Jianjun Jiang, Changjun Department of Computer Science and Technology The Key Lab. of 'Embedded System and Service Computing' Ministry of Education of China Tongji University Shanghai 201804 China

Pairwise testing, which requires that every combination of valid values of each pair of system factors be covered by at lease one test case, plays an important role in software testing since many faults are caused by unexpected 2-way interactions among system factors. Although meta-heuristic strategies like simulated annealing can generally discover smaller pairwise test suite, they may cost more time to perform search, compared with greedy algorithms. We propose a new method, improved Extremal Optimization (EO) based on the Bak-Sneppen (BS) model of biological evolution, for constructing pairwise test suites and define fitness function according to the requirement of improved EO. Experimental results show that improved EO gives similar size of resulting pairwise test suite and yields an 85% reduction in solution time over SA.

关键词： Simulated annealing

来源：评论

学校读者我要写书评

暂无评论

L-UCON: Towards layered access control with UCON

L-UCON: Towards layered access control with UCON

引用

7th IEEE/IFIP International Conference on Embedded and Ubiquitous Computing, EUC 2009

作者： Hu, Hao Li, Hao Feng, Dengguo Dept. of Electronic Engineering and Information Science University of Science and Technology of China Hefei 230027 China State Key Lab. of Information Security Institute of Software Chinese Academy of Sciences Beijing 100190 China National Engineering Research Center for Information Security Beijing 100190 China

ISBN: (纸本)9780769538235

Traditional access control solutions suffer from difficulties in access rights authorization and usage policy enforcement, especially in highly distributed environments. The layered nature of common digital content should also be exploited to efficiently provide the user with choices over digital content layers. This paper presents a layered access control architecture L-UCON based on usage control model UCON and trusted computing. We are motivated to design LUCON as a general access solution by binding policies to usage-controlled digital content. Moreover, LUCON is a negotiable solution caring about both the user's and the owner's benefits. Test results show that performance of L-UCON is acceptable. © 2009 IEEE.

关键词： Authorization

来源：评论

学校读者我要写书评

暂无评论

Investigation and analysis of the weakness and efficiency of generalized cycling attacks on RSA modulus

引用

Tongxin Xuebao/Journal on Communications 2009年第6期30卷 70-74页

作者： Jiang, Zheng-Tao Huai, Jin-Peng Wang, Yu-Min School of Computer Science Communication University of China Beijing 100024 China School of Computer Science and Technology Beijing University of Aeronautics and Astronautics Beijing 100083 China National Lab. of Software Development Environment Beijing University of Aeronautics and Astronautics Beijing 100083 China National Key Lab. of Integrated Service Networks Xidian Univ. Xi'an 710071 China

The efficiency of attacking methods on secure RSA modulus was investigated. It was pointed out by analysis that since the success probability of some attack methods was neglectable, these methods could not be regarded as the reason for choosing strongly secure RSA modulus. In consideration of the analysis of attack methods, the signification of secure RSA modulus was summarized, which enhanced the efficiency of selecting secure parameters in practice. The result that the difference between two RSA primes d=|p-q| must not be too small was further investigated, and the d might be seen as a special case when dl,m=ql-pm (l,mZ+) was small. From the analysis, it could be figured out that the randomness of the relation between the two primes should not be neglected during selecting RSA modulus. To improve the security, it should be avoided to have some specially functional relations between the two primes when choosing a larger d.

关键词： Efficiency

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：