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IEEE International Symposium on Information Theory

作者： Hanxu Hou Kenneth W. Shum Minghua Chen Hui Li Peking University Beijing Beijing CN Institute of Network Coding Chinese University of Hong Kong Hong Kong China Department of Information Engineering Chinese University of Hong Kong Hong Kong China Shenzhen Engineering Laboratory of Converged Networks Technology Shenzhen Key Laboratory of Cloud Computing Technology and App. Shenzhen Graduate School Peking University Shenzhen China

ISBN: (纸本)9781479904440

Regenerating code is a class of storage codes that achieve the optimal trade-off between storage capacity and repair bandwidth, which are two important performance metrics in data storage systems. However, existing constructions of regenerating codes rely on expensive computational operations such as finite field multiplication. The high coding and repair complexity limit their applications in large-scale practical storage systems. In this paper, we show that it is possible to achieve the full potential of regenerating codes with low computational complexity. In particular, we propose a new class of regenerating codes, called BASIC codes, that can achieve two specific points (i.e., minimum-bandwidth and minimum-storage regenerating points) on the storage and repair bandwidth trade-off curve, using only binary addition and shift operations in the coding and repair processes. Although in this paper we focus on constructing and analyzing BASIC codes for two specific exact-repair settings, our framework can be generalized to develop BASIC codes for more general exact- and functional-repair regenerating codes.

关键词： Maintenance engineering Encoding Polynomials Vectors Symmetric matrices Bandwidth Computational complexity

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fast Unbalanced Three-phase Adjustment base on Single-phase Load Switching

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Telkomnika - Indonesian Journal of Electrical Engineering 2013年第8期11卷 4327-4334页

作者： Zheng, Yanwei Zou, Lisheng He, Jian Su, Yongyi Feng, Zhiquan Shandong Provincial Key Laboratory of Network based Intelligent Computing School of Information Science and Engineering University of Jinan 106 Jiwei road 250022 Jinan city China Department of Production and Technology Linyi Power Supply Corp. 130 Jinqueshan road 276001 Linyi city China

To balance three-phase loads in distribution network with abundant of single-phase loads, a new wiring method and three-phase loads adjustment policy was proposed in this paper. In the wiring method, a single-phase load was connected with phase A, B and C of trunk line by a controller. When the load of trunk line was unbalanced, the controller will switch the connected single-phase loads from one phase to another to balance it. The minimum count of loads adjustment algorithm and the most balance adjustment algorithm were proposed, which can adjust the three-phase load of trunk line to roughly balance automatically. This method can solve the serious three-phase unbalance problems of the trunk lines with aboundant of single-phase loads. It may instead of capacitive compensation in low voltage distribution network to improve power quality and reduce network losses. © 2013 Universitas Ahmad Dahlan.

关键词： Electric wiring

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Software structure evaluation based on the interaction and encapsulation of methods

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Science China(Information Sciences) 2012年第12期55卷 2816-2825页

作者： ZHENG QingHua 1,2,OU ZhiJiang 1,2,LIU Ting 1,YANG ZiJiang 3,HOU YuQiao 1,2 & ZHENG Chao 1,2 1 MOE key laboratory for Intelligent networks and network security,Xi'an Jiaotong University,Xian 710049,China 2 Shaanxi key laboratory of Satellite-terrestrial network technology R&D,Xi'an Jiaotong University,Xian 710049,China 3 Department of Computer Science,Western Michigan University,Michigan,USA 1. MOE Key Laboratory for Intelligent Networks and Network Security Xi’an Jiaotong University Xian 710049 China2. Shaanxi Key Laboratory of Satellite-terrestrial Network Technology R&D Xi’an Jiaotong University Xian 710049 China3. Department of Computer Science Western Michigan University Michigan USA

Software structure is the most important factor affecting the quality of a *** evaluation of software structure is a foundational technique for software ***,the traditional evaluation criteria,such as "high cohesion and low coupling",are no longer appropriate for the new web applications,which are designed with a hierarchical framework.A novel approach is proposed in this paper to evaluate software quality based on the interaction and encapsulation of *** particular,two criteria for high quality software,the functional and hierarchical structure,are proposed to support widely used web *** cohesion and coupling and layer matching ratios between methods within a software package are calculated to determine whether the package is well implemented in terms of functional or hierarchical *** approach enables us to quantify the quality of a software system according to the structural types of its *** were carried out on 18 versions of Struts and six open-source software *** evaluation concurs with the intuition that minor upgrades,aimed at fixing bugs and adding minor functionality quickly,reduce software quality,whereas major upgrades,which normally clean up messy code and re-construct the software,improve software quality.

关键词： software structure evaluation method interaction method encapsulation functional structure hierarchical structure

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A cross layer collaborating cache scheme to improve performance of HTTP clients in MANETs

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International Journal of u- and e- Service, Science and technology 2013年第6期6卷 51-57页

作者： Liu, Jin Ren, Hongmin Wang, Jin Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai China Shanghai International Shipping Institute Shanghai Maritime University Shanghai China Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing China College of Information Engineering Shanghai Maritime University Shanghai China

This paper proposes a novel cross layer collaborating cache scheme for HTTP clients. It is designed to accelerate the process that an HTTP client retrieves Web content in mobile ad hoc network environment. Unlike other techniques to exploit Web proxy caching or to build P2P protocol overlay to improve HTTP, our scheme incorporates collaboratively working capability into the HTTP client response cache, and thus there is no impact on the compatibility of upper level applications. In addition, as the sharing file information is diffused with routing information, there is no redundant traffic to maintain the cooperating cache mechanism. Using this scheme, cacheable Web content can be distributed among local peers and retrieved later by a client if needed. In our simulation results, this novel cache scheme significantly decreases the latency experienced by a client to download Web content. © 2013 SERSC.

关键词： HTTP

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BIDE-based parallel mining of frequent closed sequences with MapReduce

BIDE-based parallel mining of frequent closed sequences with...

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12th International Conference on Algorithms and Architectures for Parallel Processing, ICA3PP 2012

作者： Yu, Dongjin Wu, Wei Zheng, Suhang Zhu, Zhixiang School of Computer Hangzhou Dianzi University Hangzhou China Zhejiang Provincial Key Laboratory of Network Technology and Information Security Hangzhou China

ISBN: (纸本)9783642330643

Parallel processing is essential to mining frequent closed sequences from massive volume of data in a timely manner. On the other hand, MapReduce is an ideal software framework to support distributed computing on large data sets on clusters of computers. In this paper, we develop a parallel implementation of BIDE algorithm on MapReduce, called BIDE-MR. It iteratively assigns the tasks of closure checking and pruning to different nodes in cluster. After one round of map-combine-partition-reduce, the closed frequent sequences with round-specific length and the candidates for the next round of computation are generated. Since the candidates and their pseudo project databases are independent with each other, BIDE-MR achieves high speed-ups. We implement BIDE-MR on an Apache Hadoop cluster and use BIDE-MR to mine the vehicles which frequently appear together from massive records collected at different monitoring sites. The results show that BIDE-MR attains good parallelization. © 2012 Springer-Verlag.

关键词： MapReduce

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Efficient and random oracle-free conditionally anonymous ring signature

Efficient and random oracle-free conditionally anonymous rin...

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6th International Conference on Provable security, ProvSec 2012

作者： Zeng, Shengke Qin, Zhiguang Lu, Qing Li, Qinyi School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 611731 China Network and Data Security Key Laboratory of Sichuan Province China Shanghai Key Laboratory of Integrate Administration Technologies for Information Security China

ISBN: (纸本)9783642332715

Compared to conventional ring signature schemes, conditionally anonymous ring signatures allow to revoke the anonymity of actual signer without the group manager's help if necessary. When the actual signer intends to confirm his role, it can be proved by a confirmation algorithm. In addition, any user, who is in a ring but not signer, can claim this through a disavowal algorithm. There were several proposals which were proved secure in random oracles. In other words, the security of such schemes depends on the randomness of hash functions. Recently, Zeng et al. proposed a generic construction of conditionally anonymous ring signature scheme without random oracles. Their scheme relies on NIZKs and pseudorandom functions, which render it to be inefficient. This paper proposes a practical ring signature scheme with traceability without random oracles in the common reference string model. © 2012 Springer-Verlag.

关键词： Hash functions

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Corrigendum to “A variable-length model for masquerade detection” [J. Syst. Softw. 85 (2012) 2470–2478]

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Journal of Systems and Software 2013年第3期86卷 868-868页

作者： Xi Xiao Xinguang Tian Qibin Zhai Shutao Xia Graduate School at Shenzhen Tsinghua University 518055 Shenzhen China State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences 100049 Beijing China Key Laboratory of Network Science and Technology Institute of Computing Technology Chinese Academy of Sciences 100190 Beijing China

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Efficient DPCA SAR imaging with fast iterative spectrum reconstruction method

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Science China(Information Sciences) 2012年第8期55卷 1838-1851页

作者： FANG Jian1,ZENG JinShan1,XU ZongBen1&ZHAO Yao2 1M inistry of Education key Lab for Intelligent networks and network security Xi'an Jiaotong University,Xi'an 710049,China 2N ational key laboratory of Science and technology on Microwave Imaging&Institute of Electronics,Chinese Academy of Sciences,Beijing 100049,China 1. Ministry of Education Key Lab for Intelligent Networks and Network Security Xi’an Jiaotong University Xi’an 710049 China2. National Key Laboratory of Science and Technology on Microwave Imaging & Institute of Electronics Chinese Academy of Sciences Beijing 100049 China

The displaced phase center antenna(DPCA)technique is an effective strategy to achieve wide-swath synthetic aperture radar(SAR)imaging with high azimuth ***,traditionally,it requires strict limitation of the pulse repetition frequency(PRF)to avoid non-uniform ***,any deviation could bring serious ambiguity if the data are directly processed using a matched *** break this limitation,a recently proposed spectrum reconstruction method is capable of recovering the true spectrum from the nonuniform ***,the performance is sensitive to the selection of the *** regularization based imaging may provide a way to overcome this *** existing time-domain method,however,requires a large-scale observation matrix to be built,which brings a high computational *** this paper,we propose a frequency domain method,called the iterative spectrum reconstruction method,through integration of the sparse regularization technique with spectrum analysis of the DPCA *** approximately expressing the observation in the frequency domain,which is realized via a series of decoupled linear operations,the method performs SAR imaging which is then not directly based on the observation matrix,which reduces the computational cost from O(N2)to O(N log N)(where N is the number of range cells),and is therefore more efficient than the time domain *** sparse regularization scheme,realized via a fast thresholding iteration,has been adopted in this method,which brings the robustness of the imaging process to the PRF *** provide a series of simulations and ground based experiments to demonstrate the high efficiency and robustness of the *** simulations show that the new method is almost as fast as the traditional mono-channel algorithm,and works well almost independently of the PRF ***,the suggested method can be accepted as a practical and efficient wide-swath SAR imaging technique.

关键词： displaced phase center antenna sparse regularization iterative thresholding spectrum reconstruction

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Decomposition equation of basis images with consideration of global illumination

Decomposition equation of basis images with consideration of...

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1st International Conference on Computational Visual Media, CVM 2012

作者： Qin, Xueying Zhang, Rui Lin, Lili Zhong, Fan Xing, Guanyu Peng, Qunsheng School of Computer Science and Technology Shandong University China Shandong Provincial Key Laboratory of Network Based Intelligent Computing China State Key Laboratory of CAD and CG Zhejiang University China

ISBN: (纸本)9783642342622

In augmented reality, it is required to sense the changing of the light condition for achieving illumination consistency. In this paper, we build up the decomposition equation of basis images of static scenes for this purpose. It is proved that the basis images are invariants of the scene, which is the global illumination effects of a distributed light source with unit power, and it is unnecessary to assume that the reflectance of appearance of objects in scenes is ideal diffuse. Our method can also be applied in image understanding and compressing. © 2012 Springer-Verlag.

关键词： Augmented reality

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Mining protocol state machines by interactive grammar inference

Mining protocol state machines by interactive grammar infere...

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2012 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012

作者： Zhang, Zhao Wen, Qiao-Yan Tang, Wen State Key Laboratory of Network and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China IT Security Cooperate Technology Siemens Ltd. Beijing 100102 China

ISBN: (纸本)9780769547725

Protocol state machine is very essential in network security and implementation fields, however, improper management of software evolution, compounded by changing and imprecise requirements, along with "short time to market" phenomenon, often leads to a lack of up-to-date specifications and they are often characterized by bugs, anomalies and even threads. How to mine the accurate protocol state machine under investigation is still an open problem. We address this problem by using an interactive grammar inference technique as it could generate queries to the protocol implementation in learning process. This paper describes: (1) a flexible method to construct and parse real packet according to the packet format, (2) how to generate packet queries to explore protocol state machine space, (3) applies the QSM technology to mine protocol state machine from network traces. To access the usefulness of our approach, several experiments for different protocols are performed and we could get more objective and accurate results compared with other protocol specification mining methods. © 2012 IEEE.

关键词： network security

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