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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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Genetic Algorithm-Based Power Management in Cloud Platform

Genetic Algorithm-Based Power Management in Cloud Platform

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International Conference on Internet technology and Applications (iTAP)

作者： Zili Xiong Zhang Zhang Huafeng Kong Deqing Zou School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Key Laboratory of Information Network Security Ministry of Public Security Third Research Institute of Ministry of Public Security Shanghai China

Cloud computing is a novel computing pattern, and it can provide underlying hardware resource for cloud users on demand. Virtualization is the key technology of cloud computing, and it provides the technical support for cloud computing. In cloud platform, power management is an indispensable function of cloud system administration. Based on genetic algorithm, this paper proposes a power management method based on virtual cluster. The experiments on Xen platform prove the effectiveness of our method.

关键词： Genetic algorithms Entropy Cloud computing Quality of service security Presses Clustering algorithms

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A new evaluation model for security protocols

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Journal of Communications 2011年第6期6卷 485-494页

作者： Yang, Chao Ma, Jianfeng Dong, Xuewen Key Laboratory of Computer Networks and Information Security Ministry of Education Xidian University Xi'an 710071 China School of Computer Science and Technology Xidian University Xi'an 710071 China

Till today, the study of performance of security protocols of WLAN has been one of research focuses. Whereas, owing to enormous complexity and low efficiency of modeling security protocols, there has been by now no uniform method or technology that can be used generally to simulate and evaluate security protocols, and no simulation system available that can well support research on performance of security protocols. So in view of the status quo, we, in this paper, mainly propose a novel security protocol simulation architecture and a simulation extending method for simulating security protocols of WLAN, and then set up a simulation platform for modeling such protocols based on OPNET, a famous simulation software. Finally, with an instance of extending and simulating a security protocol of WLAN, the validity and the universality of the simulation architecture and the extending method as well as the feasibility and correctness of the simulation platform are demonstrated. © 2011 ACADEMY PUBLISHER.

关键词： Wireless local area networks (WLAN)

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Attributes knowledge reduction and evaluation decision of logistics centre location based on rough sets

Attributes knowledge reduction and evaluation decision of lo...

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International Conference on Intelligent Computation technology and Automation

作者： Ren, Yongchang Xing, Tao Quan, Qiang Chen, Xiaoji College of Information Science and Technology Bohai University Jinzhou China Key Laboratory of City Operation and Management Beijing Research Center of Urban Systems Engineering Beijing China Electronic and Information Engineering College Liaoning Technology University Jinzhou China Department of Computer Science Xingtai Polytechnic College Xingtai China

ISBN: (纸本)9780769543536

Reasonable choice of logistics center location, has important significance, for optimizing the regional industrial layout, and promoting the development of modern logistics industry. For the problems such as the logistics center location by many influence factors, the decision-making and evaluation of location program are complex, this paper use the rough sets method to study. first, analyze the influence factors of logistics center location, to build the influence factors index system, second, on the basis of properties importance formula which has been given, study the attributes knowledge acquisition algorithm, then study the decision model of program evaluation, including basic evaluating relationship model, fuzzy partial order model and mathematical formula which estimate the total order of evaluation objects, in the end, through logistics center location examples to illustrate the concrete steps of attributes knowledge acquisition and evaluation decision. The results show that, use the rough sets theory, conduct the evaluation decision after the attributes knowledge acquisition, this method is simple and applicable, and is the scientific method of logistics center location. © 2011 IEEE.

关键词： Knowledge acquisition

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An effective control scheme to ensure real-time causal order in large-scale distributed interactive simulations

An effective control scheme to ensure real-time causal order...

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2011 IEEE 3rd International Conference on Communication Software and Networks, ICCSN 2011

作者： Zhou, Hangjun Fu, Sha Department of Information Management Hunan University of Finance and Economics Chang Sha Hu Nan China Key Laboratory of Science and Technology for National Defence of Parallel and Distributed Processing School of Computer Science National University of Defense Technology Chang Sha Hu Nan China

ISBN: (纸本)9781612844855

When a large-scale distributed interactive simulation system is running on WAN, the sites usually disperse over a wide area in geography, which results in the simulation clock of each site is hardly to be accurately synchronized with that of other sites. The asynchronous clocks and large transmission latency on WAN bring on a problem for the large-scale simulations to preserve the real-time causal order delivery of received events at each site. In this article, we analyze the indirect way to compare the values of asynchronous simulation clocks at first, and then propose a novel scheme which can select the reconstructible causal control information for each message so as to ensure the causal ordering of events in real time. Experiments demonstrate that the scheme can weaken the effect of network latency, reduce the overhead of the transmission amount of control information and improve the causal order consistency in asynchronous distributed simulations. © 2011 IEEE.

关键词： Real time control

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An Example-Driven Symbol Recognition Approach Based on key Features in Engineering Drawings

An Example-Driven Symbol Recognition Approach Based on Key F...

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IEEE International Conference on computer-Aided Design and computer Graphics

作者： Tiantian Guo Hui Zhang Yamei Wen Key Laboratory for Information System Security Ministry of Education Beijing China School of Software Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Beijing China

In this paper, we present an example-driven symbol recognition algorithm based on its key features in CAD engineering drawings. When user provides an example of a specific symbol, the input symbol is analyzed and its features are extracted automatically. Based on the relation representation, the constrained tree with key feature priority can be established for this type of symbol. By this means, the symbol library can be built and expanded automatically in order to handle variety engineering drawings. In the next stage of the recognition processes, we first locate the key feature nodes in drawings, and then find other elements around which satisfy the topology structure of constrained tree. If all the elements and constrains in the tree are found, the symbol object will be recognized. Because of the accurate position, unnecessary matching calculations are greatly reduced. Experimental results validate that our approach is effective.

关键词： Engineering drawings Feature extraction Design automation Pattern recognition Knowledge acquisition Libraries

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