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QoS benefit driven scheduling framework for middleware

Ruan Jian Xue Bao/Journal of software 2006年第6期17卷 1381-1390页

作者： Zhang, Wen-Bo Chen, Ning-Jiang Wei, Jun Huang, Tao Technology Center of Software Engineering Institute of Software Chinese Academy of Sciences Beijing 100080 China Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 China Graduate School Chinese Academy of Sciences Beijing 100049 China College of Computer Electronic and Information Guangxi University Nanning 530004 China

The first-come first-served scheduling framework adopted by most application servers has been proved to be inappropriate for dealing with unexpected overload for Internet-oriented Web applications. Considering the deficiency of the existing work from the architecture view, this paper presents a scheduling framework based on the notion of QoS benefits, which contains several cooperating components to guarantee the QoS requirements of the applications. The QoS benefits used to evaluate the QoS guarantee provided by the server according to the QoS requirements of the applications and the resource management based on the QoS benefits will help to provide a better QoS guarantee. Experimental results confirm the efforts on the OnceAS application Server.

关键词： Quality of service

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Petri nets-based modeling for dynamic stock trading systems

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Journal of Computational Information Systems 2005年第3期1卷 543-548页

作者： Zheng, Hong Du, Yuyue Department of Computer Science and Engineering East China University of Science and Technology Shanghai 200237 China College of Information Science and Engineering Shandong University of Science and Technology Qingdao 266510 China Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 China

Temporal Petri nets can not only enhance the modeling and analyzing power of Petri nets, but compensate the shortcoming that Petri nets do not represent timing constraint. By means of temporal Petri nets, an online dynamic stock trading system based on shared-variable distributed shared memory is adopted, and the requirements specification of the dynamic stock trading system is formally modeled and elegantly described by formulas containing the temporal operators.

关键词： Petri nets

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Simulation experimentation with secure overlay services

Simulation experimentation with secure overlay services

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Summer computer Simulation Conference 2005, SCSC 2005, Part of the 2005 Summer Simulation Multiconference, SummerSim 2005

作者： Fletcher, Harold W. Richardson, Kevin Carlisle, Martin C. Hamilton Jr., J.A. Computer Science and Software Engineering Auburn University Auburn AL 36849 United States Department of Computer Science U.S. Air Force Academy Colorado Springs CO 80840 United States

ISBN: (纸本)9781622763511

The problem of Distributed Denial of Service attacks present a clear threat to the US information infrastructure. As long as that threat exists, malicious users on the Internet have the capability to engage in pinpoint attacks of sites connected to the Internet, rendering them inoperable for minutes or even hours. Much of the work on this subject has focused on reactive approaches to defense, identifying and filtering attack packets, using trace back strategies to locate attackers, etc. In this paper we simulate one of the preventative solutions, Secure Overlay Services. Our simulation shows that SOS provides connectivity throughout even a very powerful and intelligent attack using a widely distributed overlay network.

关键词： Denial-of-service attack

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Ganglion-based balance design of multi-layer model and its watchfulness-keeping

Ganglion-based balance design of multi-layer model and its w...

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作者： Wei, Hui Luan, Shang-Min Department of Computer Science Brain Science Research Center Fudan University Shanghai 200433 China Intelligence Engineering Lab. Institute of Software Chinese Academy of Sciences Beijing 100080 China

An important problem of machine vision is the balance among the efficiency, accuracy and computation cost. The visual system of man can keep watchfulness to the perimeter of a visual field and subtly process information emerging in the center of the visual field at the same time. This kind of requirement assignment of computation can virtually ease the demand of hardware both in quantity and complexity. Therefore designing an artificial model based on biological mechanism is an effective approach. In this paper a multi-layer neural model is designed based on the multi-scale receptive fields of ganglions in retina. The model can keep watch on the periphery part of a scene while processing the center information of the scene. And why it can balance the hardware complexity, processing precision and computational intensity is analyzed. An experiment is done to test the model's sensitivity in watchfulness keeping and its efficiency and veracity in environment sampling. This model may provide valuable inspiration in the implementation of real-time processing and the avoidance of expensive computation cost in machine vision.

关键词： computer vision

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Investigating manifold learning algorithms based on magnification factors and principal spread directions

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Jisuanji Xuebao/Chinese Journal of computers 2005年第12期28卷 2000-2009页

作者： He, Li Zhang, Jun-Ping Zhou, Zhi-Hua Shanghai Key Laboratory of Intelligent Information Processing Department of Computer Science and Engineering Fudan University Shanghai 200433 China Key Laboratory of Complex Systems and Intelligence Science Chinese Academy of Sciences Shanghai 200433 China Department of Computer Science and Engineering School of Mathematical Sciences Fudan University Shanghai 200433 China National Laboratory for Novel Software Technology Nanjing University Nanjing 210093 China

As a new unsupervised learning technique, manifold learning has captured the attention of many researchers in the field of machine learning and cognitive sciences. The major algorithms include Isometric mapping (ISOMAP) and Locally Linear Embedding (LLE). The approaches can be used for discovering the intrinsic dimensions of nonlinear high-dimensional data effectively and aim researchers to analyze the data better. How to quantitatively analyze the relationship between the intrinsic dimensions and the observation space, however, has fewer reports. And thus further works in manifold learning may have suffered some difficulties. The paper focuses on two kinds of manifold learning algorithms (ISOMAP, LLE), and discusses magnification factors and principal spread directions from the observation space to the intrinsic low-dimensional space. Also the corresponding algorithm is proposed. Experiments show the effectiveness and advantages of the research.

关键词： Learning algorithms

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A collaborative editing environment for 3D shape object

A collaborative editing environment for 3D shape object

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International Conference on computer Supported Cooperative Work in Design

作者： Dongxing Teng Hongan Wang Guozhong Dai Xinghui Dong Integrated Intelligence Engineering Lab & Laboratory of Computer Science Institute of Software of Chinese Academy of Sciences Beijing China Department of Science & Technology North China Electric Power University China

ISBN: (纸本)184000025

Innovation on 3D shape design relies on advanced product design theory and effective design tools. The requirements for design tools mainly include collaborative performance and natural performance of interaction. In this paper, a 3D collaborative editing environment based on interactive transaction log is put forward and moreover the system architecture is presented. The collaborative mechanism is discussed and the collision detection of manipulation and application strategy during the course of multi-user concurrency editing is studied, the interactive gesture appropriate to 3D model and application methods are studied too. Finally a prototype system is built, which obtains satisfied result in practice.

关键词： Collaboration Shape Concurrent computing Process design Graphics Collaborative tools Sun Design engineering Power engineering and energy computer science

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Automated detection of performance regressions: the mono experience

Automated detection of performance regressions: the mono exp...

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

作者： T. Kalibera L. Bulej P. Tuma Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Prague Czech Republic Institute of Computer Science Academy of Sciences of Czech Republic Czech Republic

engineering a large software project involves tracking the impact of development and maintenance changes on the software performance. An approach for tracking the impact is regression benchmarking, which involves automated benchmarking and evaluation of performance at regular intervals. Regression benchmarking must tackle the nondeterminism inherent to contemporary computer systems and execution environments and the impact of the nondeterminism on the results. On the example of a fully automated regression benchmarking environment for the mono open-source project, we show how the problems associated with nondeterminism can be tackled using statistical methods.

关键词： MONOS devices Benchmark testing software performance software testing software quality Quality assurance Automatic testing Robustness Performance analysis software engineering

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Dynamic LOD on GPU

Dynamic LOD on GPU

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computer Graphics International

作者： Junfeng Ji Enhua Wu Sheng Li Xuehui Liu Lab. of Comput. Sci. Chinese Acad. of Sci. Beijing China Laboratory of Computer Science Institute of Software Chinese Academy and Sciences Beijing China Faculty of Science and Technology University of Macau Macao China School of Electronics Engineering & Computer Science Peking University Beijing China

ISBN: (纸本)15301052

This paper presents a novel approach to implementing dynamic LOD on GPU. For our purpose, a quadtree structure is created based on seamless geometry image atlas, which is a 3D surface representation in parameter space by combining the features of geometry images and poly-cube maps. All the nodes in the quadtree are packed into the atlas textures. There are two rendering passes in our approach. In the first pass, the LOD selection is performed in the fragment shaders. The resultant buffer is taken as the input texture to the second rendering pass by vertex texturing, and thus the node culling and triangulation can be performed in the vertex shaders. Our LOD algorithm can generate adaptive meshes dynamically, and can be fully implemented on GPU. It improves the efficiency of LOD selection, and alleviates the computing load on CPU.

关键词： Geometry Rendering (computer graphics) Graphics Hardware Pixel Concurrent computing Runtime Mesh generation Digital elevation models Image converters

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Multifractal queue tail analysis based on wavelet

Multifractal queue tail analysis based on wavelet

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2004 Joint Conference of the 10th Asia-Pacific Conference on Communications and the 5th International Symposium on Multi-Dimensional Mobile Communications Proceedings, APCC/MDMC'04

作者： Hong, Fei Zhao, Zhuang Wang, Ying School of Computer Science and Engineering BeiHang University Beijing China College of Software Engineering Graduate School Chinese Academy of Sciences Beijing China

ISBN: (纸本)0780386019

Recent research shows that one of remarkable characteristic is the fractal nature of the investigated network traffic, especially the multifractal phenomena over small time scale. In this paper, based on multifractal wavelet analysis, we perform the efficient queue tail analysis in an infinite capacity single server queue serviced at a constant rate driven by general multifractal input process. With the scale nature of wavelet, it is more convenient and accurate to perform the tail asymptotic analysis in wavelet domain than the analysis one. These results are validated by queuing simulation of the measured network traffic traces. © 2004 IEEE.

关键词： Telecommunication traffic

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Cabot: On the ontology for the middleware support of context-aware pervasive applications

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IFIP International Conference on Network and Parallel Computing, NPC 2004

作者： Xu, Chang Cheung, S.C. Lo, Cindy Leung, K.C. Wei, Jun Department of Computer Science Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Technology Center of Software Engineering Institute of Software Chinese Academy of Science China

ISBN: (纸本)3540233881

Middleware support is a major topic in pervasive computing. Existing studies mainly address the issues in the organization of and the collaboration amongst devices and services, but pay little attention to the design support of context-aware pervasive applications. Most of these applications are required to be adaptable to dynamic environments and self-managed. However, most context-aware pervasive applications nowadays have to carry out tedious tasks of gathering, classifying and processing messy context information due to lack of the necessary middleware support. To address this problem, we propose a novel approach based on ontology technology, and apply it in our Cabot project. Our approach defines a context ontology catered for the pervasive computing environment. The ontology acts as the context information agreement amongst all computing components to support applications with flexible context gathering and classifying capabilities. This allows a domain ontology database to be constructed for storing the semantics relationship of concepts used in the pervasive computing environment. The ontology database supports applications with rich context processing capabilities. With the aid of ontology technology, Cabot further helps alleviate the impact of the naming problem, and support advanced user space switching. A case study is given to show how Cabot assists developers in designing context-aware pervasive applications. © IFIP International Federation for Information Processing 2004.

关键词： Middleware

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