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29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBS 2007), vol.10

作者： Vaclav Chudacek Milan Petrik George Georgoulas Miroslav Cepek Lenka Lhotska Chrysostomos Stylios Gerstner laboratory at Department of Cybernetics Czech Technical University Czech Republic Czech Republic Department of Cybernetics Center for Machine Perception Czech Technical University Czech Republic Intelligent Control Systems Laboratory Georgia Technology Research Institute Atlanta USA Czech Republic Department of Computer Science and Engineering Neural Computing Group Czech Technical University Czech Republic Czech Republic Department of Cybernetics Gerstner Laboratory Czech Technical University Czech Republic Department of Informatics and Communications Technology TEI Epirus Artas Greece

In this work we present a comparative study, testing selected methods for clustering and classification of holter electrocardiogram (ECG). More specifically we focus on the task of discriminating between normal 'N' beats and premature ventricular 'V' beats. Some of the tested methods represent the state of the art in pattern analysis, while others are novel algorithms developed by us. All the algorithms were tested on the same datasets, namely the MIT-BIH and the AHA databases. The results for all the employed methods are compared and evaluated using the measures of sensitivity and specificity.

关键词： Electrocardiography Testing Decision trees Laboratories Cybernetics Sensitivity and specificity Heart rate variability Clustering algorithms Spatial databases Computational complexity

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Eliminating execution overhead of disabled optional features in connectors 1

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3rd European Workshop on Software Architecture, EWSA 2006

作者： Bulej, LubomÍr Bure Š, TomÁš Distributed Systems Research Group Department of Software Engineering Charles University Malostranské nám. 25 Prague118 00 Czech Republic Institute of Computer Science Academy of Sciences of the Czech Republic Pod Vodárenskou věží 2 Prague182 07 Czech Republic

ISBN: (数字)9783540692720

ISBN: (纸本)9783540692713

Connectors are used to realize component interactions in component systems. Apart from their primary function, which is mediating the communication, their implementation can also support additional features that, while unrelated to the primary function, may benefit from their placement in connectors. Such features are often optional in the sense that they can be activated and deactivated at run-time. The problem is that even if they are disabled, their very presence in the connector incurs certain overhead. In this paper, we describe an approach to eliminate this overhead by reconfiguration of the connector implementation. Besides connectors, the approach is applicable to similar technologies such as reflective middleware and other architecture-based component systems and frameworks. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Middleware

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A brief Introduction to MOSEL-2

A brief Introduction to MOSEL-2

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13th GI/ITG Conference - Measuring, Modelling and Evaluation of computer and Communication systems

作者： Patrick Wuechner Hermann de Meer Joerg Barner Gunter Bolch Chair of Computer Networks and Computer Communications Faculty of Mathematics and Computer Science University of Passau Innstr. 33 94032 Passau Germany Research Group on Analytical Modeling Chair of Distributed Systems and Operating Systems Department of Computer Science University of Erlangen-Nürnberg Martensstr. 1 91058 Germany

The versatile MOdeling, Specification and Evaluation Language is the core element of the MOSEL-2 tool. This description languages provides a high-level means for specifying models, performance measures, and the graphical presentation of results. The description languages is implemented in form of an evaluation environment that comprises translators to the modeling languages of several third-party performance evaluation tools that evaluate the specified model.

关键词： Numerical models Computational modeling Stochastic processes Mathematical model Analytical models computer performance Performance evaluation

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Adaptive Batching for Replicated Servers

Adaptive Batching for Replicated Servers

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Reliable distributed systems

作者： Roy Friedman Erez Hadad Computer Science Department Technion - Israel Institute of Technology Haifa Israel Distributed Computing Systems Group IBM Haifa Research Lab Haifa Israel

This paper presents two novel generic adaptive batching schemes for replicated servers. Both schemes are oblivious to the underlying communication protocols. Our novel schemes adapt their batching levels automatically and immediately according to the current communication load. This is done without any explicit monitoring or calibration of the system. Additionally, the paper includes a detailed performance evaluation

关键词： Delay Throughput Monitoring Protocols Costs Computational efficiency Bandwidth computer science Calibration distributed computing

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The Development of a Digital Multichannel Correlator System for Light Scattering Experiments

The Development of a Digital Multichannel Correlator System ...

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2006 IET Irish Signals and systems Conference

作者： C. Jakob A. Th. Schwarzbacher B. Hoppe R. Peters Department of Electronics and Communications Engineering Dublin Institute of Technology Ireland Department of Computer Science Systems Research Group University of Applied Sczence Darmstadt Germany ALV Laser Vertriebs GmbH Langen Germany

The measurement of light scattering is a well established scientific method for the analysis of particle sizes in macromolecular solutions. The spectrum of applications reaches from physics, over pharmacology, molecular and cell biology, immunology right up to environmental research. The underlying principle of this approach is the extraction of spectral information from light scattering using correlation techniques. The system at present, in the phase of design, represents a novel FPGA based real-time multi correlator system for multi angle dynamic and static light scattering experiments

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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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Event handling for the universal enterprise

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Information Technology and Management 2005年第1期6卷 123-148页

作者： Cilia, Mariano Bornhövd, Christof Buchmann, Alejandro P. Databases/Distributed Systems Group Department of Computer Science Darmstadt University of Technology 64289 Darmstadt Hochschulstr. 10 Germany Faculty of Sciences UNICEN Tandil Argentina IBM Almaden Research Center San Jose CA United States

Current trends in the global economy are leading to inter-enterprise interactions and to new business models that depend on the timely notification of events and the reaction to them. In this paper we present a distributed reactive middleware that supports the proactive notification of events in heterogeneous environments. The infrastructure consists of a publish/subscribe notification mechanism and a reactive functionality. We represent events that may originate from heterogeneous sources together with their ontology-based context metadata to make them self-describing beyond the boundaries of the event source. We introduce the notion of concept-based addressing to publish/subscribe systems. Concept-based addressing allows us to express subscriptions to events according to different contexts than those of the published events and yet match them successfully. By using ontologies and context definitions consistently for events, notifications, subscriptions and reactions we provide the necessary support for event handling in global enterprises. © 2005 Springer science + Business Media, Inc.

关键词： Business rules Event handling Event-based applications Publish/subscribe Reactive service Semantic data integration

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A peer-to-peer mechanism for resource location and allocation over the grid

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2nd International Symposium on Parallel and distributed Processing and Applications, ISPA 2004

作者： Hsiao, Hung-Chang Baker, Mark King, Chung-Ta Computer and Communication Research Center National Tsing-Hua University 300 Taiwan The Distributed Systems Group University of Portsmouth PO1 2EG United Kingdom Department of Computer Science National Tsing-Hua University 300 Taiwan

ISBN: (纸本)9783540241287

Recent advances in P2P lookup overlays provide an appealing solution for distributed search without relying on a single database server. In addition to performing resource discovery, these P2P substrates also offer membership management for dynamic peers. In this paper, we propose a publicly shared architecture called VC2A that takes advantage of a P2P lookup substrate for computational applications. VC2A targets computational master-slave applications. An application running in VC2A dynamically allocates resources from the system on the fly. These allocated resources then self-manage and -heal. We have implemented an architecture based on our previous efforts that include an enhanced P2P lookup overlay and a mobile agent system on top of this overlay. We show that VC2A is not only scalable but robust, and takes advantage of heterogeneity of the resources. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Substrates

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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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Working together in philosophy and informatics: An introduction to the contributions of the Second International Workshop on Philosophy and Informatics (WSPI 2005)

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3rd Biennial Conference on Professional Knowledge Management, WM 2005

作者： Deussen, Thilo Roth-Berghofer, Thomas R. Büchel, Gregor Klein, Bertin Department of Artificial Intelligence University of Ulm 89069 Ulm Germany Knowledge-Based Systems Group Department of Computer Science University of Kaiserslautern P.O. Box 3049 67653 Kaiserslautern Germany Institute of Communications Engineering University of Applied Sciences Cologne 50679 Cologne Germany Knowledge Management Department German Research Center for Artificial Intelligence DFKI GmbH Erwin-Schrodinger-Strae 57 67663 Kaiserslautern Germany

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