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IEEE International Conference on Cluster Computing

作者： Kenin Coloma Avery Ching Alok Choudhary Wei-keng Liao Rob Ross Rajeev Thakur Lee Ward Electrical and Computer Engineering Department Northwestern University USA Mathematics and Computer Science Division Argonne National Laboratory USA Scalable Computing Systems Sandia National Laboratories USA

The MPI-IO standard creates a huge opportunity to break out of the traditional file system I/O methods. As a software layer between the user and the file system, an MPI-IO library can potentially optimize I/O on behalf of the user with little to no user intervention. This is all possible because of the rich data description and communication infrastructure MPI-2 offers. Powerful data descriptions and some of the other desirable features of MPI-2, however, make MPI-IO challenging to implement. By creating a new collective I/O implementation that allows developers to easily tinker and play with new optimizations or combinations of different techniques, research can proceed faster and be quickly and reliably deployed

关键词： Laboratories File systems Power system reliability Read-write memory mathematics computer science software libraries Computational modeling Power system modeling Concurrent computing

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Sufficient excitation conditions for system identification using binary-valued observations

Sufficient excitation conditions for system identification u...

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American Control Conference (ACC)

作者： Le Yi Wang G.G. Yin Yanlong Zhao Ji-Feng Zhang Department of Electrical and Computer Engineering Wayne State University Detroit MI USA Department of Mathematics Wayne State University Detroit MI USA Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy and Sciences China

Conditions on input signals are derived that characterize their probing richness for system identification using binary-valued observations. Identification configurations in open-loop, filtering, and feedback systems are discussed together with different scenarios of noises including actuator noise, input measurement noise, and output measurement noises. In addition to system parameter estimation, identifiability and sufficient excitation conditions are also derived under unknown threshold and noise distributions

关键词： System identification Noise measurement Sensor systems Parameter estimation Sensor phenomena and characterization Distribution functions mathematics Filtering Output feedback Actuators

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Economy-Based Data Replication Broker

Economy-Based Data Replication Broker

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IEEE International Conference on e-science and Grid Computing

作者： Henry Lin J.H. Abawajy Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne Melbourne VIC Australia Grid and Pervasive Computing Laboratory School of Engineering and Information Technology Deakin University Geelong VIC Australia

ISBN: (纸本)9781424430116

Data replication is one of the key components in data grid architecture as it enhances data access and reliability and minimises the cost of data transmission. In this paper, we address the problem of reducing the overheads of the replication mechanisms that drive the data management components of a data grid. We propose an approach that extends the resource broker with policies that factor in user quality of service as well as service costs when replicating and transferring data. A realistic model of the data grid was created to simulate and explore the performance of the proposed policy. The policy displayed an effective means of improving the performance of the grid network traffic and is indicated by the improvement of speed and cost of transfers by brokers.

关键词： Resource management Australia Telecommunication traffic Power generation economics Cost accounting Protocols Grid computing Pervasive computing computer science software

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Segregated failures model for availability evaluation of fault-tolerant systems 06

Segregated failures model for availability evaluation of fau...

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Proceedings of the 29th Australasian computer science Conference - Volume 48

作者： Sergiy A. Vilkomir David L. Parnas Veena B. Mendiratta Eamonn Murphy Software Quality Research Laboratory (SQRL) Department of Computer Science and Information Systems University of Limerick Limerick Ireland Bell Laboratories Lucent Technologies Naperville IL Department of Mathematics and Statistics University of Limerick Limerick Ireland

ISBN: (纸本)9781920682309

This paper presents a method of estimating the availability of fault-tolerant computer systems with several recovery procedures. A segregated failures model has been proposed recently for this purpose. This paper provides further analysis and extension of this model. The segregated failures model is compared with a Markov chain model and is extended for the situation when the coverage factor is unknown and failure escalation rates must be used instead. This situation is illustrated in detail by estimating availability of a Lucent Technologies Reliable Clustered Computing architecture. For this example, numeric values are provided for availability indexes and the contribution of each recovery procedure to total system availability is analysed.

关键词： fault-tolerance reliability failures model recovery availability software

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Towards a Grid of Sensors for Telemedicine

Towards a Grid of Sensors for Telemedicine

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Annual IEEE Symposium on computer-Based Medical systems

作者： C.O. Rolim F.L. Koch M. Assuncao C.B. Westphall Network and Management Laboratory Federal University of Santa Catarina Florianopolis Santa Catarina Brazil Grid Computing and Distributed Systems Laboratory and NICTA Victoria Laboratory Department of Computer Science and Software Engineering University of Melbourne Melbourne VIC Australia

In this article, we describe a grid of sensors to collect patients' vital data and to allow real time monitoring of patients in heath-care centres. We analyse the problem scenario and identify the components involved towards the construction of an integrated and homogeneous management system. Finally, we present a case study to demonstrate the applicability of our approach

关键词： Telemedicine Grid computing Laboratories Real time systems Sensor systems Patient monitoring computerized monitoring Data security Ontologies computer architecture

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Generating multi-scroll chaotic attractors via threshold control

Generating multi-scroll chaotic attractors via threshold con...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Jinhu Lu K. Murali S. Sinha H. Leung Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems Science슠Chinese Academy of Sciences Beijing China Department of Physics Anna University Chennai India Institute for Mathematical Sciences Chennai India Department of Electrical and Computer Engineering University of Calgary Calgary Canada

This paper proposes a novel threshold control approach for creating multi-scroll chaotic attractors. The general jerk circuit is used as an example to show the working principle of this method. The controlled jerk circuit can emerge various limit cycles and n-scroll chaotic attractors by adjusting the upper threshold, lower threshold, and the width of inner saturated plateau. The dynamical mechanism of the threshold control is then further explored by analyzing the system dynamical behaviors. In particular, this method is effective and simple to implement since we only need monitor a single state variable and reset it if it exceeds the thresholds. It indicates the potential engineering applications for various chaos-based information systems

关键词： Chaos Control systems Circuits Limit-cycles Optimal control Linear feedback control systems Hysteresis Laboratories Physics computing systems engineering and theory

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BlueGene/L Failure Analysis and Prediction Models

BlueGene/L Failure Analysis and Prediction Models

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International Conference on Dependable systems and Networks (DSN)

作者： Yinglung Liang Yanyong Zhang A. Sivasubramaniam M. Jette R. Sahoo Electrical & Computer Engineering Department Rutgers University USA Computational Resource Management Group Lawrence Livemore National Laboratory USA Computer Science & Engineering Department Pennslyvania State University USA Exploratory Systems Software Department IBM Thomas J. Watson Research Center USA

The growing computational and storage needs of several scientific applications mandate the deployment of extreme-scale parallel machines, such as IBM's BlueGene/L which can accommodate as many as 128 K processors. One of the challenges when designing and deploying these systems in a production setting is the need to take failure occurrences, whether it be in the hardware or in the software, into account. Earlier work has shown that conventional runtime fault-tolerant techniques such as periodic checkpointing are not effective to the emerging systems. Instead, the ability to predict failure occurrences can help develop more effective checkpointing strategies. Failure prediction has long been regarded as a challenging research problem, mainly due to the lack of realistic failure data from actual production systems. In this study, we have collected RAS event logs from BlueGene/L over a period of more than 100 days. We have investigated the characteristics of fatal failure events, as well as the correlation between fatal events and non-fatal events. Based on the observations, we have developed three simple yet effective failure prediction methods, which can predict around 80% of the memory and network failures, and 47% of the application I/O failures

关键词： Failure analysis Predictive models Production systems Checkpointing Concurrent computing Parallel machines Hardware Runtime Fault tolerant systems Prediction methods

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Combining Probabilistic Ranking and Latent Semantic Indexing for Feature Identification

Combining Probabilistic Ranking and Latent Semantic Indexing...

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IEEE Workshop on Program Comprehension

作者： D. Poshyvanyk A. Marcus V. Rajlich Y.-G. Gueheneuc G. Antoniol Department of Computer Science Wayne State University Detroit MI USA GEODES-Research Group on Open Distributed Systems Experimental Software Engineering University of Montreal Canada Department of Mathematics and Computer Science Babeş-Bolyai University Cluj-Napoca Romania Département de Génie Informatique École Polytechnique de Montréal Canada

The paper recasts the problem of feature location in source code as a decision-making problem in the presence of uncertainty. The main contribution consists in the combination of two existing techniques for feature location in source code. Both techniques provide a set of ranked facts from the software, as result to the feature identification problem. One of the techniques is based on a scenario based probabilistic ranking of events observed while executing a program under given scenarios. The other technique is defined as an information retrieval task, based on the latent semantic indexing of the source code. We show the viability and effectiveness of the combined technique with two case studies. A first case study is a replication of feature identification in Mozilla, which allows us to directly compare the results with previously published data. The other case study is a bug location problem in Mozilla. The results show that the combined technique improves feature identification significantly with respect to each technique used independently

关键词： Indexing computer science software engineering Information retrieval Information analysis Data mining Decision making Uncertainty software debugging software systems

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Semantic-based Grid Resource Discovery and its Integration with the Grid Service Broker

Semantic-based Grid Resource Discovery and its Integration w...

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International Conference on Advanced Computing and Communications (ADCOM)

作者： Thamarai Selvi Somasundaram R.A. Balachandar Vijayakumar Kandasamy Rajkumar Buyya Rajagopalan Raman N. Mohanram S. Varun Department of Information Technology Anna University Chennai India Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia Centre for Development of Advanced Computing Chennai India Centre for Development of Advanced Computing Bangalore India

This paper addresses the need of semantic component in the grid environment to discover and describe the grid resources semantically. We propose semantic grid architecture by introducing a knowledge layer at the top of Gridbus broker architecture and thereby enabling broker to discover resources semantically. The semantic component in the knowledge layer enables semantic description of grid resources with the help of ontology template. The ontology template has been created using Protege-OWL editor for different types of computing resources in the grid environment. The Globus Toolkit's MDS is used to gather grid resource information and Protege-OWL libraries are used to dynamically create knowledge base of grid resources. Algernon inference engine is used for interacting with the knowledge base to discover suitable resources.

关键词： Distributed computing Ontologies Middleware computer architecture computer networks Grid computing Libraries Engines Monitoring Aggregates

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Security analysis and improvement of hsu et al.'s threshold proxy signature scheme

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International Journal of Network Security 2006年第1期2卷 69-72页

作者： Guo, Lifeng Cheng, Xiangguo Liu, Yang Institute of Systems Science Academy of Mathematics and System Sciences Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences Beijing 100080 China 21 Heng Mui Keng Terrace Singapore State Key Laboratory of Integrated Services Network Xidian University Xi'an 710071 China Software Institute School of Electronic Engineering and Computer Science Peking University 100871 China

In 1999, Sun et al. proposed a new (t, n) threshold proxy signature scheme based on Zhang's threshold proxy signature scheme. But in 2003 Hsu et al. pointed out that Sun's scheme suffered from a drawback and demonstrated an improvement to counter it. In this paper we point out that Hsu's scheme suffers from an insider attack against their scheme. That is, a malicious proxy signer can forge a valid threshold proxy signature on any message. To thwart this attack, some improvements are further proposed.

关键词： Authentication

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