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International Symposium on Parallel and Distributed Processing with Applications, ISPA

作者： Lingfang Zeng Dan Feng Bharadwaj Veeravalli Qingsong Wei Division of Data Storage System Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage Ministry of Education School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Department of Electrical and Computer Engineering National University of Singapore Singapore Data Storage Institute Singapore

With our society more information-driven, we have begun to distribute data in wide-area storage systems. At the same time, both physical failure and logic error have made it difficult to bring the necessary recovery to bear on remote data disaster, and understanding this proceeding. We describe ARRAY, a system architecture for data disaster recovery that combines reliability, storage space, and security to improve performance for data recovery applications. The paper presents an exhaustive analysis of the design space of ARRAY systems, focusing on the trade-offs between reliability, storage space, security, and performance that ARRAY must make. We present RSRAII (Replication-based Snapshot Redundant Array of Independent Imagefiles) which is a configurable RAID-like data erasure-coding, and also others benefits come from consolidation both erasure-coding and replication strategies. A novel algorithm is proposed to improve snapshot performance referred to as SMPDP (Snapshot based on Multi-Parallel Degree Pipeline).

关键词： Secure storage Network servers Bandwidth Redundancy Data security Cities and towns Laboratories Educational technology Hardware History

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Research of secure intranet/internet access platform based on ontology

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Journal of Networks 2009年第10期4卷 1009-1016页

作者： Shen, Shigen Ye, Lihua Yue, Guangxue Yu, Fei College of Mathematics and Information Engineering Jiaxing University Jiaxing China College of Computer and Communication Hunan University Changsha China Department of Computer Science and Technology Huaihua University Huaihua China Jiangsu Provincial Key Laboratory of Computer Information Processing Technology Suzhou China

Faced with the general trend of centralization of information, the biggest challenge to enterprise is how to ensure that all fixed computers and different mobile devices anywhere can access securely and quickly enterprise's businesses. To solve this problem, an Ontology-based Secure intranet/Internet Access Platform (OSAP) is presented. Ontology has been applied to the field of software resources sharing. Software resource ontology is defined for building the foundation of Software Resource Ontology Sharing Model (SROSM) and the OSAP. The OSAP framework is presented by semantic modeling based on SROSM for providing users with better and higher QOS in sharing software resources. The OSAP is designed with OSAP Portal, Connection Module, Session Management Module, security Module, RDP Module, and Bitmap Caching Module. The design ideas and functionalities of all modules are introduced. Based on the open Remote Desktop Protocol (RDP), the OSAP prototype is realized and key technologies including client display, data compression and security are described. To guarantee data transmission security and avoid access problem due to the firewall obstructing port 3389, the SSL protocol is employed to encapsulate RDP data packages between clients and OSAP as the RDP is used between OSAP and Terminal Services servers. Experimental results demonstrate that the OSAP has better performance involving response time, network usage, RAM usage and CPU usage. © 2009 ACADEMY PUBLISHER.

关键词： Ontology

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The ATPG Conflict-Driven Scheme for High Transition Fault Coverage and Low Test Cost

The ATPG Conflict-Driven Scheme for High Transition Fault Co...

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IEEE VLSI Test Symposium (VTS)

作者： Zhen Chen Dong Xiang Boxue Yin Department of Computer Science and Technology Tsinghua University School of software Key Laboratory for Information System Security Ministry of Education Tsinghua National Laboratory for Information Science and Technology Tsinghua University

ISBN: (纸本)9781424437696

This paper presents two new conflict-driven techniques for improving transition fault coverage using multiple scan chains. These techniques are based on a novel test application scheme, in order to break the functional dependency of broadside testing. The two new techniques analyze the ATPG conflicts in broadside test generation, and try to control the flip-flops with most influence on the fault coverage. The conflict-driven method selects some flip-flops that work in the enhanced mode and distributes them into different chains. In the multiple scan chain architecture, to avoid too many scan-in pins, some chains are driven by the same scan-in pin to construct a tree-based architecture. Based on the architecture, the new test application scheme allows some flip-flops working in the enhanced mode, while most of others working in the traditional broadside mode. With the efficient conflict-driven selection method, fault coverage is improved greatly, which can also reduce test application time and compress test data volume. Experimental results show that fault coverage based on the proposed method is comparable to the enhanced scan.

关键词： Automatic test pattern generation Costs Circuit faults Flip-flops Circuit testing Fault detection Software testing system testing Educational technology Paper technology

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A Structural Health Monitoring system Using Wireless Sensor Network

A Structural Health Monitoring System Using Wireless Sensor ...

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Jianjun Niu Zhidong Deng Fengguang Zhou Zongsheng Cao Zhanqing Liu Fangzhou Zhu State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory of Information Science and Technology Department of Computer Science and Technology Tsinghua University China Beijing Special Engineering Design and Research Institute China

Wireless sensor network (WSN) based structural health monitoring (SHM) system attracts increasing interest in recent years. However, the restricted bandwidth, memory and energy pose great challenges to the application of SHM in large scale building. Supported by a real engineering project, a WSN based prototype of SHM system is designed in this paper. Acceleration data, synchronously sampled in each sensor node, are transported to a data processing computer through a base station. In order to achieve a high network throughput, a time division multiple access (TDMA) approach is proposed to reduce the packet collision and energy consumption. 17 sensor nodes, one base station and a processing computer are distributed to validate the prototype system. Test results present that the approach, we proposed, can reduce the signal collision and increase data throughput. The prototype is feasible to the SHM project of a large scale building.

关键词： Monitoring Wireless sensor networks Prototypes Large-scale systems Base stations Throughput Time division multiple access Bandwidth Application software Buildings

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A New Data Streaming Method for Locating Hosts with Large Connection Degree

A New Data Streaming Method for Locating Hosts with Large Co...

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Xiaohong Guan Pinghui Wang Tao Qin MOE Key Laboratory of Intelligent Networks and Network Security State Key Laboratory of Manufacturing Systems Xi'an Jiaotong University Xi'an China Department of Automation Tsinghua National Laboratory of Information Science and Technology Tsinghua University Beijing China

Locating hosts with large connection degree is very important for monitoring anomalous network traffics. The in-degree (out-degree), defined as the number of distinct sources (destinations) that a network host is connected with (connects) during a given time interval. Due to massive amount of data in high speed network traffics and limit on processing capability, it is difficult to accurately locate hosts with large connection degree over high speed links on line. In this paper we present a new data streaming method for locating hosts with large connection degree based on the reversible connection degree sketch to monitor anomalous network traffics. The required memory space is small and constant, and more importantly the update/query complexity would not depend on the amount of data. The hash functions for data sketch are designed based on the remainder characteristics of the number theory so that in-degree/out-degree associated with a given host can be accurately estimated. Although the connection degree sketch does not preserve any host address information, we can analytically reconstruct the host addresses associated with large in-degree/out-degree by a simply equation purely based on the characteristics of the hash functions without using any host address information. This procedure is highly efficient since the computational time is constant and ignorable. Furthermore, this reversible connection degree sketch based method can be easily implemented in distributed systems. The experimental and testing results based on the actual network traffics show that the new method is truly accurate and efficient.

关键词： Telecommunication traffic computer crime Intrusion detection Statistical distributions Velocity measurement Sampling methods Condition monitoring Failure analysis Scalability Statistics

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A Universal Composability Framework for Analysis of Proxy Threshold Signature

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Journal of Shanghai Jiaotong university(science) 2009年第1期14卷 107-111页

作者：洪璇李详学龚征陈克非 Department of Computer Science and Engineering Shanghai Jiaotong UniversityShanghai 200240China School of Information Security Engineering Shanghai Jiaotong UniversityShanghai 200240China State Key Laboratory of Information Security Graduate School of the Chinese Academy of SciencesBeijing 100039China Distributed and Embedded Security Group Faculty of EEMCSUniversity of Twente7500 AE Enschedethe Netherlands

The universal composability framework is a new approach for designing and analyzing the security of cryptographic *** this framework,the security of protocols is maintained under a general protocol composition *** the paper,we propose the universal composability framework for the analysis of proxy threshold signature and present a universally composable secure proxy threshold signature scheme which is the first one in this *** proposed scheme is suitable for the mobile agents,which should migrate across different environment through ***,we give the concrete analysis of the reduction to prove the security of the proposed scheme.

关键词： proxy threshold signature universal composability RSA cryptosystem mobile agents

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Calculating Minimum Buffer Requirement of Constant Rate Transmission Scheme Based on SVM

Calculating Minimum Buffer Requirement of Constant Rate Tran...

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International Conference on computer and information technology (CIT)

作者： Zilei Wang Hongsheng Xi Guo Wei Key Laboratory of Network Communication System and Control Chinese Academy of Sciences University of Science and Technology Hefei Anhui China Department of Electronic Engineering and Information Science USTC Hefei Anhui China

Constant rate transmission and transport (CRTT) is an effective bandwidth smoothing scheme resulting in one fixed rate during the whole duration of variable bit-rate video, which, however, needs a large client buffer size. The minimum buffer requirement (MBR) of CRTT, besides benefiting the design of some piecewise transmission scheme, can examine whether we can transmit the requested video with a constant rate for a given buffer size. In this paper, we formulate off-line bandwidth smoothing into a binary classification problem of the underflow and overflow points. Then we propose a novel algorithm based on support vector machine because of its equal margin, which,we have proven, is able to minimize the required buffer size of CRTT. Our algorithm, therefore, can exactly calculate MBR together with the CRTT transmission rate without exhaustively searching buffer sizes and startup delay. The simulation results using some real MPEG4 and H.264 video show the philosophy and effectiveness of our algorithm.

关键词： Support vector machines Smoothing methods Bandwidth Support vector machine classification Streaming media Video compression computer networks Delay MPEG 4 Standard Buffer storage

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Universal composability framework for analysis of proxy threshold signature

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Journal of Shanghai Jiaotong University (science) 2009年第1期14 E卷 107-111页

作者： Hong, Xuan Li, Xiang-Xue Gong, Zheng Chen, Ke-Fei Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai 200240 China School of Information Security Engineering Shanghai Jiaotong University Shanghai 200240 China State Key Laboratory of Information Security Graduate School Chinese Acad. of Sci. Beijing 100039 China Distributed and Embedded Security Group Faculty of EEMCS University of Twente 7500 AE Enschede Netherlands

The universal composability framework is a new approach for designing and analyzing the security of cryptographic protocols. In this framework, the security of protocols is maintained under a general protocol composition operation. In the paper, we propose the universal composability framework for the analysis of proxy threshold signature and present a universally composable secure proxy threshold signature scheme which is the first one in this area. The proposed scheme is suitable for the mobile agents, which should migrate across different environment through network. Furthermore, we give the concrete analysis of the reduction to prove the security of the proposed scheme. Copyright.

关键词： Mobile agents

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A Dynamic Description Logic-Based Formalism for RBAC

A Dynamic Description Logic-Based Formalism for RBAC

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International Conference on computer sciences and Convergence information technology (ICCIT)

作者： Li Ma Shilong Ma Jianghua Lv Yuefei Sui Department of Computer Science Beihang University Beijing China Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy and Sciences Beijing China

ISBN: (纸本)9781424452446

Applications in the open and dynamic environment become more intelligent and complicated. To secure these applications is a big challenge. RBAC model, as a de facto standard in access control field, is widely used in many applications. But the lack of dynamic and formal method to describe RBAC makes the model can't completely adapt to the open and dynamic environment. To solve this problem, we introduce a three level RBAC model which unifies the administrative components, the administrative actions and the regular RBAC components, and also proposes a dynamic description logic, called DDL RBAC , to formalize the three level model. Based on the formal description of RBAC with DDL RBAC , an executable action decision algorithm to guarantee the dynamic consistency of systems is also presented.

关键词： Logic Access control Authorization Data security information security Mathematical model Permission information technology computer science Laboratories

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Single vs. population cell coding: Gaze movement control in target search

Single vs. population cell coding: Gaze movement control in ...

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International Joint Conference on Neural Networks (IJCNN)

作者： Jun Miao Laiyun Qing Lijuan Duan Baixian Zou Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy and Sciences Beijing China School of Information Science and Engineering Chinese Academy of Sciences Beijing China College of Computer Science and Technology University of Technology Beijing China Department of Information Science and Technology College of Art and Science Beijing Union Technology Beijing China

Gaze movement plays an important role in human visual search system. In literature, the winner-take-all method is wildly used to simulate the controlling of the gaze movement. The winner-take-all is a type of single-cell coding method, which uses one cell (grandmother cell) or one response to represent an object. However, eye movement is affected by the visual context which includes more than one object in images, especially in target search. Therefore, we propose to use the population coding with more than one response rather than the single-cell coding on gaze movement control. The proposed method is supported by the theoretical analysis and experiments on a real image database which show the population-cell-coding improves the target locating accuracy by 44.4% only at the cost of coding 22.4% more information than that of single-cell-coding.

关键词： Humans Image coding Image databases Costs information science Educational institutions Biological neural networks Control systems Image analysis information analysis

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