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International Conference on High Performance Switching and Routing

作者： Wang, Xiaoliang Jiang, Xiaohong Pattavina, Achille State Key Laboratory of Novel Software Technology Department of Computer Science and Technology Nanjing University China Future University Hakodate Hokkaido Japan Department of Electronics and Information Politecnico di Milano 20133 Milano Italy

ISBN: (纸本)9781424484560

The mission critical network infrastructures are facing potential large region threats, both intentional (like EMP attack, bomb explosion) and natural (like earthquake, flooding). The available research on region failure related vulnerability studies generally adopt a kind of simple deterministic region failure models, which can not capture some important features of real region failure scenarios, where a network component in the region only fails with certain probability, and more importantly, such failure probability tends to vary with both its dimension and its distance to failure center. In this paper, we provide a more general probabilistic region failure model to capture the key features of a region failure and apply it for the network vulnerability assessment. To facilitate such assessment, we adopt a grid partition-based scheme to estimate various statistical network metrics under a random region failure. A theoretical framework is also established to determine a suitable grid partition such that a specified estimation error requirement is satisfied. The grid partition technique is also useful for identifying the vulnerable zones of a network, which can guide network designers to initiate proper network protection against such failures. The work in this paper helps us more deeply understand the network vulnerability behavior under region failure and facilitates the design and maintenance of future highly survivable mission critical networks. © 2011 IEEE.

关键词： Network security

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3DV quality model based depth maps for view synthesis in FTV system

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Journal of Shanghai University(English Edition) 2011年第4期15卷 335-341页

作者：张秋闻安平张艳张兆杨王元庆 Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of EducationShanghai 200072P.R.China School of Communication and Information Engineering Shanghai University Department of Computer Science and Technology Anhui University of Finance and EconomicsBengbu 230030AuhuiP.R.China Department of Electronics Science and Engineering Nanjing University

Depth maps are used for synthesis virtual view in free-viewpoint television （FTV） systems. When depth maps are derived using existing depth estimation methods, the depth distortions will cause undesirable artifacts in the synthesized views. To solve this problem, a 3D video quality model base depth maps （D-3DV） for virtual view synthesis and depth map coding in the FTV applications is proposed. First, the relationships between distortions in coded depth map and rendered view are derived. Then, a precisely 3DV quality model based depth characteristics is develop for the synthesized virtual views. Finally, based on D-3DV model, a multilateral filtering is applied as a pre-processed filter to reduce rendering artifacts. The experimental results evaluated by objective and subjective methods indicate that the proposed D-3DV model can reduce bit-rate of depth coding and achieve better rendering quality.

关键词： free-viewpoint television （FTV） 3D video quality model base depth maps （D-3DV） view synthesis

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Automatic Generation of Canonical Views for CAD Models

Automatic Generation of Canonical Views for CAD Models

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IEEE International Conference on computer-Aided Design and computer Graphics

作者： Kaimo Hu Bin Wang Bin Yuan Junhai Yong Key Laboratory for Information System Security Ministry of Education Beijing China Department of Computer Science and Technology Tsinghua University Beijing China School of Software Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Beijing China

Selecting the best views for 3D objects is useful for many applications. However, with the existing methods applied in CAD models, the results neither exhibit the 3D structures of the models fairly nor conform to human's browsing habits. In this paper, we present a robust method to generate the canonical views of CAD models, and the above problem is solved by considering the geometry and visual salient features simultaneously. We first demonstrate that for a CAD model, the three coordinate axes can be approximately determined by the scaled normals of its faces, such that the pose can be robustly normalized. A graph-based algorithm is also designed to accelerate the searching process. Then, a convex hull based method is applied to infer the upright orientation. Finally, four isometric views are selected as candidates, and the one whose depth image owns the most visual features is selected. Experiments on the Engineering Shape Benchmark (ESB) show that the views generated by our method are pleasant, informative and representative. We also apply our method in the calculation of model rectilinearity, and the results demonstrate its high performance.

关键词： Solid modeling Design automation Mathematical model Visualization Three dimensional displays Equations Computational modeling

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An Optimal Color Mapping Strategy Based on Energy Minimization for Time-Varying Data

An Optimal Color Mapping Strategy Based on Energy Minimizati...

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IEEE International Conference on computer-Aided Design and computer Graphics

作者： Yi Peng Jie Dong Li Chen Haiyang Chu Junhai Yong Key Laboratory for Information System Security Ministry of Education Beijing China Department of Computer Science and Technology Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Beijing China School of Software Tsinghua University Beijing China

Color mapping plays a critical role in visualization of time-varying data and also sets a challenge for researchers due to the consistency of mapping and great changes in time-varying data. In order to solve this problem and generate feature-prominent animation, we present a two phase optimization technique using bilateral filtering and global energy functions. In the first phase, for each time step, we use a weighted mapping function which combines linear mapping and feature histogram. In the second phase, an optimization function taking global color mapping and minimum color difference into consideration is designed. So users can clearly distinguish between data in variable time steps and easily understand the corresponding relationships between different structures. The experiments' results show that our method can achieve high quality visualization for both static and time-varying data.

关键词： Image color analysis Data visualization Optimization Correlation Minimization Transfer functions Histograms

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A Real-Time Face Recognition system Based on BDPCA Plus BDDLDA

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Procedia Environmental sciences 2011年 11卷 139-146页

作者： Jing Li Zehong Yang Yixu Song Quan Yang Fangwen Zhai State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory for Information Science and Technology Department of Computer Science and Technology Tsinghua University Beijing 100084 China

Holistic-based methods, especially principal component analysis(PCA) and linear discriminant analysis(LDA), are very popularly used in face recognition. In last several years, the direct LDA(D-LDA) method was suggested to overcome the so-call “small simple size” problem. Besides, the researchers suggest bidirectional PCA(BDPCA) method, which may be more real-time and effective than PCA, and proposed BDPCA plus LDA (BDPCA+LDA). In the same way, we suggest bidirectional D-LDA(BDDLDA) should be faster than D-LDA, and proposed BDPCA plus BDDLDA (BDPCA+BDDLDA). In this paper, we present a real-time face recognition system for operating system authentication based on BDPCA+BDDLDA. A face database, which was collected with a CCD camera on the laptop, is used to evaluate this system. Experimental results show that this practical system is real-time and effective.

关键词： Face Recognition Bidirectional Principal Component Analysis (BDPCA) Bidirectional Direct Linear Discriminant Analysis (BDDLDA)

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Multi-user private keyword search for cloud computing

Multi-user private keyword search for cloud computing

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2011 3rd IEEE International Conference on Cloud Computing technology and science, CloudCom 2011

作者： Yang, Yanjiang Lu, Haibing Weng, Jian Institute for Infocomm Research Singapore Singapore Dept. of Operations Management and Information Systems Leavey School of Business Santa Clara University United States Department of Computer Science Emergency Technology Research Center of Risk Evaluation and Prewarning on Public Network Security Jinan University Guangzhou China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences China State Key Lab. of Networking and Switching Technology Beijing University of Posts and Telecommunications China

ISBN: (纸本)9780769546223

Enterprises outsourcing their databases to the cloud and authorizing multiple users for access represents a typical use scenario of cloud storage services. In such a case of database outsourcing, data encryption is a good approach enabling the data owner to retain its control over the outsourced data. Searchable encryption is a cryptographic primitive allowing for private keyword based search over the encrypted database. The above setting of enterprise outsourcing database to the cloud requires multi-user searchable encryption, whereas virtually all of the existing schemes consider the single-user setting. To bridge this gap, we are motivated to propose a practical multi-user searchable encryption scheme, which has a number of advantages over the known approaches. The associated model and security requirements are also formulated. We further discuss to extend our scheme in several ways so as to achieve different search capabilities. © 2011 IEEE.

关键词： Outsourcing

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A Traffic congestion detection method for surveillance videos based on Macro optical flow Velocity

A Traffic congestion detection method for surveillance video...

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11th International Conference of Chinese Transportation Professionals: Towards Sustainable Transportation systems, ICCTP 2011

作者： Li, Xiying She, Yongye Yang, Guigen Zhao, Youting Luo, Donghua Guangdong Provincial Key Laboratory of Intelligent Transportation System School of Engineering Sun Yat-sen University Guangzhou 510006 China Traffic Management Bureau Guangdong Provincial Public Security Department Guangzhou 510440 China School of Information Science and Technology Sun Yat-sen University Guangzhou 510006 China

ISBN: (纸本)9780784411865

An intelligent and automatic traffic congestion detection method is proposed to reduce labor intensive monitoring work. The developed approach, applied on expressways, is to gather traffic congestion information using surveillance videos. The speed of traffic flow, defined as "macro optical flow velocity, is calculated from video pixel's motion directly. The calculation progress includes two steps: 1) extract the feature points, which meeting three conditions: corner, strong motion and main direction consistency;and 2) calculate optical flow vectors of feature points using LK algorithm. The average value is determined as the macro optical flow velocity. According its continuous time feature and other characteristic, the traffic congestion status is automatically and directly detected. The test results of surveillance videos from Guangzhou-Shenzhen expressway have shown that the proposed method could automatically detect traffic congestion in 10 seconds. © 2011 ASCE.

关键词： Optical flows

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L-WMxD: Lexical based Webmail XSS Discoverer

L-WMxD: Lexical based Webmail XSS Discoverer

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IEEE Conference on computer Communications Workshops, INFOCOM Wksps

作者： Zhushou Tang Haojin Zhu Zhenfu Cao Shuai Zhao Department of Computer Science and Engineering Shanghai Jiaotong University China Key Laboratory of Information Network Security Ministry of Public Security China

ISBN: (纸本)9781457702495

XSS (Cross-Site Scripting) is a major security threat for web applications. Due to lack of source code of web application, fuzz technique has become a popular approach to discover XSS in web application except Webmail. This paper proposes a Webmail XSS fuzzer called L-WMxD (Lexical based Webmail XSS Discoverer). L-WMxD , which works on a lexical based mutation engine, is an active defense system to discover XSS before the Webmail application is online for service. The engine is initialized by normal JavaScript code called seed. Then, rules are applied to the sensitive strings in the seed which are picked out through a lexical parser. After that, the mutation engine issues multiple test cases. Newly-generated test cases are used for XSS test. Two prototype tools are realized by us to send the newly-generated test cases to various Webmail servers to discover XSS vulnerability. Experimental results of L-WMxD are quite encouraging. We have run L-WMxD over 26 real-world Webmail applications and found vulnerabilities in 21 Webmail services, including some of the most widely used Yahoo!Mail, Mirapoint Webmail and ORACLE' Collaboration Suite Mail.

关键词： Electronic mail Servers Transforms Encoding HTML Browsers security

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Automatic object segmentation from large scale 3D urban point clouds through manifold embedded mode seeking 11

Automatic object segmentation from large scale 3D urban poin...

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19th ACM International Conference on Multimedia ACM Multimedia 2011, MM'11

作者： Yu, Zhiding Xu, Chunjing Liu, Jianzhuang Au, Oscar C. Tang, Xiaoou Shenzhen Key Laboratory for Computer Vision and Pattern Recognition Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong Department of Information Engineering Chinese University of Hong Kong Hong Kong

ISBN: (纸本)9781450306164

This paper presents a system that can automatically segment objects in large scale 3D point clouds obtained from urban ranging images. The system consists of three steps: The first one involves a ground detection process that can detect relatively complex terrain and separate it from other objects. The second step superpixelizes the remaining objects to speed up the segmentation process. In the final step, a manifold embedded mode seeking method is adopted to segment the point clouds. Even though the segmentation of urban objects is a challenging problem in terms of accuracy and problem scale, our system can efficiently generate very good segmentation results. The proposed manifold learning effectively improves the segmentation performance due to the fact that continuous artificial objects often have manifold-like structures. Copyright 2011 ACM.

关键词： Image segmentation

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Fuzzy H∞ filtering for nonlinear singularly perturbed systems with time-varying delay

Fuzzy H∞ filtering for nonlinear singularly perturbed syste...

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2011 8th International Conference on Fuzzy systems and Knowledge Discovery, FSKD 2011, Jointly with the 2011 7th International Conference on Natural Computation, ICNC'11

作者： Li, Yaping Chen, Jinxiang Meng, Lixia He, Meiyun Beijing Information Technology College Beijing 100015 China State Key Laboratory of Hybrid Process Industry Automation System and Equipment Technology Automation Research and Design Institute of Metallurgical Industry 100071 China Department of Computer Science and Technology Tsinghua University Army Aviation College Beijing 100084 China Department of Mechanism Army Aviation College Beijing 100123 China

ISBN: (纸本)9781612841816

This paper investigates the problem of designing fuzzy H∞ filter for a class of nonlinear singularly perturbed systems (SPSs) with time-varying delay in states. The considered system is approximated by a Takagi-Sugeno (T-S) fuzzy model. By using linear matrix inequality (LMI) methods, we give a -independent sufficient condition for the existence of fuzzy H∞ filter such that, the resulting filtering error system is globally stable with guaranteed H∞ performance for sufficiently small . The gains of filter are obtained by solving a set of -independent LMIs, and therefore the ill-conditioned problem caused by can be easily avoid. The proposed method can be applied to both standard and nonstandard nonlinear SPSs. A numerical example is provided to illustrate the effectiveness of the developed method. © 2011 IEEE.

关键词： Perturbation techniques

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