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2011 IEEE International Conference on Granular computing, GrC 2011

作者： Zhang, Bo Shi, Zhongzhi Key Laboratory of Intelligent Information Processing Institute of Computing Technology CAS Beijing China School of Computer Science and Technology China University of Mining and Technology Xuzhou China

ISBN: (纸本)9781457703713

Cloud computing focuses on supporting high scalable and high available parallel and distributed computing, based on the infrastructure built on top of large scale clusters which contain a large number of cheap PC servers, to process the huge amounts of data generated by Internet. As the core of cloud computing, Google's MapReduce programming model and Google File system (GFS) provide such computing power. Granular computing (GrC) is an objective world outlook and methodology. From the point of GrC, this paper surveys the Google's MapReduce programming model, analyses how to express its process of data granulation and computing more accurately and more strictly during the parallel and distributed computing. © 2011 IEEE.

关键词： MapReduce

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Analyzing and Improving MPI Communication Performance in Overcommitted Virtualized systems

Analyzing and Improving MPI Communication Performance in Ove...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication systems (MASCOTS)

作者： Zhiyuan Shao Qiang Wang Xuejiao Xie Hai Jin Ligang He Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Department of Computer Science University of Warwick Coventry UK

Nowadays, it is an important trend in the system domain to use the software-based virtualization technology to build the execution environments (e.g., Clouds) and serve high performance computing (HPC) applications. However, with the extra virtualization layer, the application performance may be negatively affected. Studies revealed that the communication performance of the MPI library, which is widely used by the HPC applications, would suffer a high penalty when a physical host machine becomes overcommitted by virtual processors (VCPU). Unfortunately, the problem has not received enough attention and has not been solved yet in literature. In this paper, we investigate the reasons behind the performance penalty, and propose a solution to improve the communication performance of running MPI applications in the overcommitted virtualized systems. The experimental results show that by our proposal, most HPC applications can gain performance improvement to different extents among the overcommitted systems, depending on their communication patterns and the over committing level.

关键词： Libraries Benchmark testing Virtual machine monitors Kernel Cloud computing Linux Virtual machining

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Network penetration testing scheme description language

Network penetration testing scheme description language

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2011 International Conference on Computational and Information sciences, ICCIS 2011

作者： Dai, Zhiyong Lv, Liangshuang Liang, Xiaoyan Bo, Yang State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769545011

Penetration testing is widely used to help ensure the security of the network. Traditional penetration testings were manually performed by tester according to scheme, the process is usually complex resulting in that it is labor-intensive and requires tester to be familiar with all kind of tools. So it is very desirable to use a unified method to describe the scheme which can be identified by computer, then the computer can be used to substitute for tester to perform penetration testing. A new method is presented to describe penetration testing scheme. We propose a language for tester to describe the penetration testing scheme. Based on the conceptual model of penetration testing scheme we design the penetration testing scheme description language (PTSDL) and outline the important EBNF. PTSDL is declarative abstracting the process of penetration testing which makes this language flexible, extensible and adaptable to new penetration testing method. Use of this language is illustrated by an experimental study, which shows that the language can effectively describe the penetration testing scheme. © 2011 IEEE.

关键词： Testing

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Conflict detection model of access control policy in collaborative environment

Conflict detection model of access control policy in collabo...

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2011 International Conference on Computational and Information sciences, ICCIS 2011

作者： Fan, Beibei Liang, Xiaoyan Luo, Yang Bo, Yang Xia, Chunhe State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769545011

Cross-domain interoperation based on role-mapping increasingly becomes a representative research field of collaborative environment. However, in this collaborative environment, there would still be more permission or less than the role of role-mapping policy required when authorization, this situation can not be completely avoided. This disaccord will result in conflict of access control policies (ACPs) in collaborative domains, and ultimately lead to unauthorized access to resources in autonomy domains. A new method is presented to detect the conflict between access control policies in collaborative environment automatically. The ACPs conflict detection model (ACPCDM) is established, the termination of ACPCDM is proved by the putdown automation, and the prototype system is implemented. At last, we validate the validity of this method with experiments, the result of the experiments shows that the analysis report of conflict can not only detect if there is conflict, but also figure out the conflict type, the causes and location of the conflict. So it is much easier for administer in each domain to resolve the conflict. © 2011 IEEE.

关键词： Mapping

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GPU accelerating for rapid multi-core cache simulation

GPU accelerating for rapid multi-core cache simulation

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25th IEEE International Parallel and Distributed Processing Symposium, Workshops and Phd Forum, IPDPSW 2011

作者： Han, Wan Xiang, Long Gao, Xiaopeng Yi, Li State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769543857

To find the best memory system for emerging workloads, traces are obtained during application's execution, then caches with different configurations are simulated using these traces. Since program traces can be several gigabytes, simulation of cache performance is a time consuming process. Compute unified device architecture (CUDA) is a software development platform which enables programmers to accelerate the general-purpose applications on the graphics processing unit (GPU). This paper presents a real time multi-core cache simulator, which was built based on the Pin tool to get the memory reference;and fast method for multi-core cache simulation using the CUDA-enabled GPU. The proposed method is accelerated by the following techniques: execution parallelism exploration;memory latency hiding;a novel trace compression methodology. We describe how these techniques can be incorporated into CUDA code. Experimental results show that the hybrid parallel method of time-partitioning combines with set-partitioning presented here is 11.10× speedup compared to the CPU serial simulation algorithm. The present simulator can characterize cache performance of single-threaded or multi-threaded workloads at the speeds of 6-15 MIPS. It can simulates 6 cache configurations within one single pass at this speeds compared to CMP$im, which can only simulate one cache configuration each simulation pass at the speeds of 4-10 MIPS. © 2011 IEEE.

关键词： Graphics processing unit

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Tissue P systems with cell separation: attacking the partition problem

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science China(Information sciences) 2011年第2期54卷 293-304页

作者： ZHANG XingYi1, WANG Shuo2, NIU YunYun2 & PAN LinQiang2 1Key Lab of Intelligent computing and Signal Processing of Ministry of Education, school of computer science and technology, Anhui University, Hefei 230039, China 2Image Processing and Intelligent Control Key laboratory of Education Ministry of China, Department of Control science and Engineering, Huazhong University of science and technology, Wuhan 430074, China 1. Key Lab of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University Hefei 230039 China2. Image Processing and Intelligent Control Key Laboratory of Education Ministry of China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Tissue P systems are distributed parallel and non-deterministic computing models in the framework of membrane computing, which are inspired by intercellular communication and cooperation between neurons. Recently, cell separation is introduced into tissue P systems, which enables systems to generate an exponential workspace in a polynomial time. In this work, the computational power of tissue P systems with cell separation is investigated. Specifically, a uniform family of tissue P systems with cell separation is constructed for effciently solving a well-known NP-complete problem, the partition problem.

关键词： membrane computing tissue P system cell separation partition problem

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Automatic generation for penetration testing scheme analysis model for network

Automatic generation for penetration testing scheme analysis...

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2011 International Conference on Computational and Information sciences, ICCIS 2011

作者： Shen, Lu Liang, Xiaoyan Bo, Yang Xia, Chunhe State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769545011

The existing penetration testing systems need to rely on the professional skills in the testing process, so they increase the penetration testing of human resources and costs. While it also reduces the efficiency of the test, it increases the test cycle. This paper presents a new penetration testing scheme by an automatically generated method. Through penetration testing scheme description, we establish an automatic generation system about penetration testing scheme, and the automatic generation penetration testing scheme for network analysis model (AGPTSAM) is established, and then the termination of the AGPTSAM is proved by the pushdown automaton. The prototype system of AGPTSAM is implemented. The penetration testing scheme could provide guidance and basis for the implementation of the penetration testing system, and shorten the test cycle and the human resources cost. This method is verification of effectiveness by experimental which works on the implementing platform. © 2011 IEEE.

关键词： Analytical models Automatica Generation Computational modeling Information security Penetration Testing Prototypes Scheme Testing

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MUSIZ: A generic framework for music resizing with stretching and cropping 11

MUSIZ: A generic framework for music resizing with stretchin...

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

作者： Zhang, Liu Wang, Chaokun Ba, Yiyuan Wang, Hao Wang, Jianmin Department of Computer Science and Technology Tsinghua University China School of Software Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology China Key Laboratory for Information System Security Ministry of Education China Key Laboratory of Intelligent Information Processing Institute of Computing Technology CAS China

ISBN: (纸本)9781450306164

Content-aware music adaption, i.e. music resizing, in temporal constraints starts drawing attention from multimedia communities because of the need of real-world scenarios, e.g. animation production and radio advertisement production. The goal of music resizing is to change the length of a music track to a user preferred length using a series of basic operations, e.g. compression, prolonging, cropping and repeating. The only existing music resizing approach so far, called LyDAR, suffers from some limitations. For example, it cannot support prolonging a music track and cannot compress music pieces with very small stretch rates. In this paper, we propose MUSIZ, a generic framework for MUsic reSIZing. Observing the diversity of quality degradation for different segments, we propose the concept of stretch-resistance to measure the degree of quality degradation after a segment is stretched. MUSIZ stretches high stretch-resistance segments intensively and relieves low stretch-resistance segments to reduce the negative impact on the stretched music piece. For short length resizing requests, we develop a contiguity-preservative cropping algorithm to remove segments before stretching, while smoothing the abrupt change at the joint between two segments. Comprehensive experimental results show that MUSIZ is superior to the existing approaches. © 2011 ACM.

关键词： stretch-resistance music retargeting music resizing

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Local shape control of a bivariate rational interpolating surface with mixing conditions

Local shape control of a bivariate rational interpolating su...

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International Symposium on Voronoi Diagrams in science and Engineering

作者： Zhang, Yunfeng Bao, Fangxun Zhang, Caiming Qi, Duan School of Computer Science and Technology Shandong Economic University Shandong Provincial Key Laboratory of Digital Media Technology Jinan China School of Mathematics and System Science Shandong University Jinan China

ISBN: (纸本)9780769544830

A bivariate rational interpolation method with parameters was created which was based on function values and partial derivatives, it is called the bivariate rational interpolation with mixing conditions. This paper will deal with the bounded property and the point control method of the interpolating surface. It is proved that the values of the interpolating function in the interpolation region are bounded no matter what the parameters might be. Also, the approximation expressions of the interpolation are derived, it is not depends on the parameters. More important is that the value of the interpolating function at any point in the interpolating region can be modified under the condition that the interpolating data are not changed by selecting the suitable parameters, so the interpolation surface can be modified for the given interpolation data when needed in practical design. © 2011 IEEE.

关键词： Interpolation

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Eliminating data invalidation in debugging multiple-clock chips

Eliminating data invalidation in debugging multiple-clock ch...

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作者： Gao, Jianliang Han, Yinhe Li, Xiaowei Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences China School of Information Science and Engineering Central South University China

ISBN: (纸本)9783981080179

A critical concern for post-silicon debug is the need to control the chip at clock cycle level. In a single clock chip, run-stop control can be implemented by gating the clock signal using a stop signal. However, data invalidation might occur when it comes to multiple-clock chips. In this paper, we analyze the possible data invalidation, including data repetition and data loss, when stopping and resuming a multiple-clock chip. Furthermore, we propose an efficient solution to eliminate data repetition and data loss. Theoretical analysis and simulation experiments are both conducted for the proposed solution. We implement the proposed Design-for-Debug (DfD) circuit with SMIC 0.18/Ltm technology and simulate the data transfer across clock domains using SPICE tool. The results show that both data repetition and data loss can be avoided with the proposed solution, even if metastability occurs. © 2011 EDAA.

关键词： Clocks

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