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IEEE International Conference on High Performance Computing and Communications (HPCC)

作者： Min Huang Yi Wang Liyan Qiao Duo Liu Zili Shao School of Electrical Engineering and Automation Harbin Institute of Technology Guangdong Province Key Laboratory of Popular High Performance Computers Shenzhen University College of Computer Science Chongqing University Department of Computing The Hong Kong Polytechnic University

ISBN: (纸本)9781479989386

Unpredictable power outages in NAND flashbased Solid State Drives (SSDs) may cause system failure or reliability problems. Capacitors are widely adopted as the interim power supplier when power interruption happens. However, since the energy provided by backup capacitors is limited, and the capacitance of a capacitor will gradually degrade with time, it is imperative to improve the efficiency and reliability of the backup process for SSDs with capacitors. This paper presents a novel backup scheme called SmartBackupfor MLC NAND flash-based SSDs with backup capacitors. In SmartBackup, by exploiting the feature of the discharge process of capacitors, all available SSD channels are fully utilized and dynamically adjusted based on the available voltage, so data can be efficiently stored in a reliable manner. Moreover, in SmartBackup, to write data in a time/energyefficient manner with better reliability, we adopt a fast and reliable programming strategy by only writing LSB (Least Significant Bit) pages in MLC NAND flash. To the best of our acknowledge, this is the first work to jointly utilize the property of the multi-page architecture of MLC NAND flash and the discharge characteristic of capacitors to improvethe efficiency and reliability of the backup process in SSDswith backup capacitors. The experimental results show thatSmartBackup can effectively accelerate the backup processand improve the reliability.

关键词： Capacitors Ash Reliability Programming Arrays Acceleration Discharges (electric)

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An SDP randomized approximation algorithm for max hypergraph cut with limited unbalance

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science China Mathematics 2014年第12期57卷 2437-2462页

作者： XU BaoGang YU XingXing ZHANG XiaoYan ZHANG Zan-Bo School of Mathematical Sciences and Institute of Mathematics Nanjing Normal University School of Mathematics Georgia Institute of Technology Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Department of Computer Engineering Guangdong Industry Technical College

We consider the design of semidefinite programming （SDP） based approximation algorithm for the problem Max Hypergraph Cut with Limited Unbalance （MHC-LU）： Find a partition of the vertices of a weighted hypergraph H = （V, E） into two subsets V1, V2 with ｜｜V2｜ - ｜1/1 ｜｜ ≤ u for some given u and maximizing the total weight of the edges meeting both V1 and V2. The problem MHC-LU generalizes several other combinatorial optimization problems including Max Cut, Max Cut with Limited Unbalance （MC-LU）, Max Set Splitting, Max Ek-Set Splitting and Max Hypergraph Bisection. By generalizing several earlier ideas, we present an SDP randomized approximation algorithm for MHC-LU with guaranteed worst-case performance ratios for various unbalance parameters τ = u/｜V｜. We also give the worst-case performance ratio of the SDP-algorithm for approximating MHC-LU regardless of the value of τ. Our strengthened SDP relaxation and rounding method improve a result of Ageev and Sviridenko （2000） on Max Hypergraph Bisection （MHC-LU with u = 0）, and results of Andersson and Engebretsen （1999）, Gaur and Krishnamurti （2001） and Zhang et al. （2004） on Max Set Splitting （MHC-LU with u = ｜V｜）. Furthermore, our new formula for the performance ratio by a tighter analysis compared with that in Galbiati and Maffioli （2007） is responsible for the improvement of a result of Galbiati and Maffioli （2007） on MC-LU for some range of τ.

关键词： max hypergraph cut with limited unbalance approximation algorithm performance ratio semidefinite programming relaxation

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Multisplitting iterative methods with general weighting matrices for solving a symmetric positive linear complementarity problem

Multisplitting iterative methods with general weighting matr...

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2014 International Conference on Artificial Intelligence and Industrial Application (AIIA2014)

作者： B.X.Duan A.M.Yu Computer Engineering Technical College Guangdong Institute of Science and Technology

ISBN: (纸本)9781784660529

In this paper, by making use of optimal models, we study the weighting matrices of the multlsplitting parallel methods for solving the symmetric positive definite linear complementarity problem, which is a powerful alternative for solving the large sparse linear complementarity problems. In our multisplitting there is only one that is required to be P-regular splitting and all the others can be constructed arbitrarily, which not only decreases the difficulty of constructing the multisplitting of the coefficient matrix, but also relaxes the constraints to the weighting matrices(unlike the standard methods, they are not necessarily nonnegative diagonal scalar matrices or given in advance). Finally, we prove the convergence of this new method.

关键词： linear complementarity problem symmetric positive definite matrix weighting matrices multisplitting convergence

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Mobile storage and data security management research

Mobile storage and data security management research

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2013 2nd International Conference on Manufacturing engineering and Process, ICMEP 2013

作者： Zeng, Wen Ying Zhao, Yue Long Computer Engineering Technical College Guangdong Institute of Science and Technology Zhuhai 519090 China School of Computer Science and Engineering South China University of Technology Guangzhou 510640 China

ISBN: (纸本)9783037857076

The mobile storages especially in mobile devices hold a lot of important and private data. The portability and mobility may lead to loss and theft, therefore security problem of mobile storages and mobile data may suffer from troublesome and damage. TCG provides TPM for trust and security management. It is insufficient with mobile storage devices because mobile storage devices are often separated and load with heterogeneity and massive data. The paper analyzes the security management of mobile storages, proposed practical mobile storage and data security management methods and mechanisms, and illustrates mobile storages integration schemes for single storage device and multiple storages devices and cloud storage. The overall mobile storage and data security policies and methods should be performed urgently. © (2013) Trans Tech Publications, Switzerland.

关键词： Virtual storage

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Single image super-resolution based on sparse representation of wavelet coefficients

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Journal of Computational Information Systems 2013年第19期9卷 7687-7693页

作者： Liao, Xiuxiu Han, Guoqiang Wo, Yan Chen, Xiangji School of Computer Science and Engineering South China University of Technology Guangzhou 510006 China School of Computer Science GuangDong Polytechnic Normal University Guangzhou 510665 China College of Informatics South China Agricultural University Guangzhou 510642 China

Sparse representation based single image super-resolution (SR) has attracted much interest. In this paper, we propose a novel SR reconstruction algorithm based on sparse representation of wavelet coefficients. The wavelet coefficients are separated into three parts: low-frequency (LF), median-frequency (MF) and high-frequency (HF) coefficients. The dictionary pairs are trained over the MF-HF wavelet coefficients. The HF details lost in the observed low-resolution (LR) image are inferred from the learned dictionary pairs, and the initial high-resolution (HR) estimate is obtained by inverse wavelet transform. Finally, iterative back-projection is used to enforce global reconstruction constraint. Experiments demonstrate that the proposed approach achieves better results than some state-of-art algorithms, in both visual perception and numerical measures. © 2013 Binary Information Press.

关键词： Iterative methods

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Development research on cloud application program based on GFS

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2013 International Conference on Applied science, engineering and technology, ICASET 2013

作者： Jiang, Wu Xue Li, Qi Fu, Yuan Yuan Department of Computer Engineering Dongguan Polytechnic Dongguan 523808 Guangdong China Department of Computer and Information Huaihua Vocational and Technical College Huaihua 418000 Hunan China School of Information Science and Engineering Hunan City University Yiyang 413000 Hunan China

ISBN: (纸本)9783037857182

The thesis expounded the connotation of cloud platform, and made a comparison between several commercial computing development platforms, for the development of cloud application program with high-efficiency and high-quality. It proposed the general process of developing a kind of cloud application software, and developed a message board cloud application program used in teaching by basing on GFS, GAE platform, as well as realizing data design and management by adopting JDO technology. Practice showed that this research possessed certain theoretical significance and practical application value. © (2013) Trans Tech Publications, Switzerland.

关键词： Application programs

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A framework of concurrent mechanism based on java multithread

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Telkomnika - Indonesian Journal of Electrical engineering 2013年第9期11卷 5395-5401页

作者： Jiang, Wuxue Li, Qi Wang, Zhiming Luo, Jianfeng Department of Computer Engineering Dongguan Polytechnic Dongguan 523808 Guangdong China Department of Computer and Information Huaihua Vocational and Technical College Huaihua 418000 Hunan China Educational Technology Center Dongguan Polytechnic Dongguan 523808 Guangdong China

The continuously increased demand for paralleling multitask in domains such as grid computing and cloud computing has significantly promoted research on concurrent mechanism and concurrent programming. The Java programming language supports multithread mechanism for developing paralleling programs, however, it is difficult to apply Java concurrent primitives to specific problems. Thus, for the development of high reliable and qualitative Java concurrent programs, this paper analyses Java multithread mechanism and it's realization, studies the concurrent mechanism based on Java synchronization and interactive communication mechanism, compares the concurrent structure based on operating system and based on Java multithread, sums up some concurrent programming rules and strategies to prevent deadlock. A frame instance based on entire synchronization is presented, which can help to develop concurrent programs quickly. © 2013 Universitas Ahmad Dahlan.

关键词： computer software

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Multi-Use Conditional Proxy Re-encryption

Multi-Use Conditional Proxy Re-encryption

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International Conference on Information science and Cloud Computing Companion (ISCC-C)

作者： Lequn Mo Guoxiang Yao School of Computer Engineering Guangdong Communication Polytechnic Guangzhou China Management School Jinan University Guangzhou China College of Information Science and Technology Jinan University Guangzhou China

ISBN: (纸本)9781479952465

In this paper a scheme named multi-use conditional proxy re-encryption based on ECC is proposed first, which can be used in the following email service scenarios: Alice can delegate her decryption rights to Bob for an encrypted mails sent to her, which contains a specific word and satisfies the condition set on the proxy by Alice, and Bob also can delegate the right to others just like Alice through the proxy, as the condition set by him is satisfied, and so on if required. Furthermore, as an important part for fulfilling our main goal, a new method to generate the partial re-encryption keys is proposed, and the security of our scheme is proven secure against chosen cipher text attacks based on the random oracle model.

关键词： Public key Electronic mail Cloud computing Elliptic curves Educational institutions

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Research on internet of things of environment monitoring based on cloud computing

Research on internet of things of environment monitoring bas...

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International Conference on Automatic Control and Artificial Intelligence, ACAI 2012

作者： Zeng, Wenying Huang, Chao Duan, Banxiang Gong, Fagen Computer Engineering Technical College Guangdong Institute of Science and Technology Zhuhai 519090 China School of Computer Science Guangdong Polytechnic Normal University Guangzhou 510665 China

ISBN: (纸本)9781849195379

Environment monitoring is the foundation of environment plan and environment protection. It has huge works, complicate and extensive sources, and need a lot of investments to do, and is difficult to perform monitoring at 24 hours every day periodically. To resolve the problem, a architecture of the internet of things of environment monitoring based on cloud computing is proposed, and a creative model named as Unified Layered Model is proposed, which combines wireless sensor network, GPS, WiFi, 3G communication, database, cloud storage, cloud computing, data mining, and service computing mode, etc. The model aims at collect and management environment monitoring data and related data, provides in time, online or offline, parallel, distributed, cross time and space environment quality monitoring, feedback and control functions.

关键词： Internet of things

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An FPGA-based intellectual property protection method at physical design level

An FPGA-based intellectual property protection method at phy...

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2012 International Conference on computer science and Information Processing, CSIP 2012

作者： Wei, Liang Jing, Long Huang, Weihong Liu, Yuanyuan School of Computer Science and Engineering Hunan University of Science and Technology China Department of Electrical Engineering Guangdong Songshan Polytechnic College Shaoguang China

ISBN: (纸本)9781467314114

An FPGA-based intellectual property protection method at physical design level is presented for ownership identification in IP reuse. The method uses the special physical structure of FPGA for watermark insertion and adds corresponding checkout mechanism in functional circuit for strengthening robustness. Watermark extractor is designed for extracting watermark by analyzing bitstream. The experimental results on Xilinx Virtex II Pro XC2VP4 shows, the presented method has less resource and timing overhead. © 2012 IEEE.

关键词： Field programmable gate arrays (FPGA)

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