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Eliminating execution overhead of disabled optional features in connectors 1

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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Waveband burst switching - a new approach to networking

Waveband burst switching - a new approach to networking

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Optical Fiber Communication (OFC) Conference

作者： R. Parthiban C. Leckie A. Zalesky R.S. Tucker Department of Electrical and Electronic Engineering ARC Special Research Centre for Ultra-Broadb and Information Networks University of Melbourne Australia Department of Computer Science and Software ARC Special Research Centre for Ultra-Broadb and Information Networks University of Melbourne Australia

We propose a waveband grooming strategy for optical burst switching. We show that by grouping bursts into wavebands, a large reduction in network equipment costs can be effected. This makes burst switching attractive ... 详细信息

ISBN: (纸本)1557528020

关键词： Burst switching Optical fiber networks Optical buffering Costs Routing Bars Optical burst switching Optical network units Assembly computer science

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A Service Model and Architecture in Support of IP Service Accounting

A Service Model and Architecture in Support of IP Service Ac...

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IEEE Symposium on Network Operations and Management

作者： P. Racz B. Stiller Communication Systems Research Group Department of Informatics IFI University of Zurich Zurich Switzerland Computer Engineering and Networks Laboratory TIK ETH Zurich Zurich Switzerland

Accounting of service usage is one of the main tasks of service providers in their operation and management processes, providing the necessary information for the subsequent charging process. Because of the increasing number and diversity of services in IP-based networks, accounting has to provide flexible and extensible means supporting different service specific accounting attributes in order to meet the providers' requirements. Furthermore, users typically access services of different providers, resulting in a service composition in a multi-provider environment. After identifying key players in this scenario, this paper presents a service model, classifying different service types, and proposes an architecture (SMArch) for a common accounting scheme, which is implemented based on the IPDR framework and reference code

关键词： Quality of service Web and internet services Electronic mail DSL GSM IP networks Contracts Data communication Network servers computer architecture

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Transform from Models to Service Description Based on MDA

Transform from Models to Service Description Based on MDA

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IEEE Asia-Pacific Conference on Services Computing (APSCC)

作者： Bin Yu Chen Zhang Yang Zhao School of Computer Science and Engineering Xidian University Xi'an China Software Engineering Institute Northwest University Xi'an China Shanghai Research & Development Center Neusoft Group Limited Shanghai China

Within MDA framework, system models can be built up on an abstract level that is independent from the platform. Later on, this abstract model can be transmitted into service description, which is related to specific platform on the implementation level. In Web services applications, this transition has a great advantage. Because, while the model of implementation changes from one case to another to fit the different platforms, the model of whole system, on a higher abstract level, stays the same. Thus, the efficiency is promoted. This paper firstly discusses the extension of UML for Web services, and then it presents the modeling process of WSDL. Finally, it gives the rules and arithmetic of transition from models to WSDL documents in detail

关键词： Web services Unified modeling language computer architecture Programming Protocols computer science Arithmetic software engineering research and development Code standards

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TF-ICF: A New Term Weighting Scheme for Clustering Dynamic Data Streams

TF-ICF: A New Term Weighting Scheme for Clustering Dynamic D...

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International Conference on Machine Learning and Applications (ICMLA)

作者： Joel W. Reed Yu Jiao Thomas E. Potok Brian A. Klump Mark T. Elmore Ali R. Hurson Applied Software Engineering Research Group Computational Sciences and Engineering Division Oak Ridge National Laboratory Oak Ridge TN USA Computer Science and Engineering Department Pennsylvania State University University Park PA USA

In this paper, we propose a new term weighting scheme called term frequency-inverse corpus frequency (TF-ICF). It does not require term frequency information from other documents within the document collection and thus, it enables us to generate the document vectors of N streaming documents in linear time. In the context of a machine learning application, unsupervised document clustering, we evaluated the effectiveness of the proposed approach in comparison to five widely used term weighting schemes through extensive experimentation. Our results show that TF-ICF can produce document clusters that are of comparable quality as those generated by the widely recognized term weighting schemes and it is significantly faster than those methods

关键词： Computational complexity Data engineering Frequency conversion Machine learning software engineering Laboratories computer science Vectors Parallel algorithms Information filtering

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dsp Forum - Future of Video Coding and Transmission

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IEEE Signal Processing Magazine 2006年第6期23卷 76-82页

作者： Gary J. Sullivan Jens-rainer Ohm Antonio Ortega Edward Delp Anthony Vetro Mauro Barni ITU-T Video Coding Experts Group Microsoft Corp. Multimedia communication systems Coding and identification and services for mobile networks Fulbright scholarhip IEEE Signal Processing and Communications Societies Electrical and Computer Engineering Mitsubishi Electric Research Labs Cambridge Massachusetts University of Siena

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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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Evaluation of handoff algorithms using a call quality measure with signal based penalties

Evaluation of handoff algorithms using a call quality measur...

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IEEE Conference on Wireless Communications and Networking

作者： M.N. Halgamuge K. Ramamohanarao H.L. Vu M. Zukerman Department of Electrical and Electronic Engineering Australia Department of Computer Science and Software Engineering RC Special Research Centre for Ultra-Broadband Information Networks University of Melbourne VIC Australia Centre for Advanced Internet Architectures Faculty of I.C.T Swinburne University of Technology VIC Australia

This paper proposes a new call quality measure based on mobile signal strength measurements to evaluate performance of handoff algorithms in wireless cellular networks. The proposed measure allows the quantification of the impact of the handoff algorithms of performance. Using the proposed measure we compare existing handoff algorithms to identify the trade-off between signal quality and required number of handoffs. Our results indicate that a handoff method based on a threshold with 2 dB hysteresis provides better performance compared to the conventional wisdom of 3 dB hysteresis. We provide a benchmark value for handoff algorithms based on an off-line heuristic method using the new measure. Our benchmark shows that there is substantial room for improvement of the existing handoff algorithm

关键词： Hysteresis Base stations GSM Electric variables measurement software measurement computer science software engineering IP networks computer architecture Land mobile radio cellular systems

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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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A SOM-based hierarchical model to short-term load forecasting

A SOM-based hierarchical model to short-term load forecastin...

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2005 IEEE Russia Power Tech, PowerTech

作者： Carpinteiro, Otávio A. S. Reis, Agnaldo J. R. Research Group on Computer Networks and Software Engineering Federal University of Itajubá 37500-903 Itajubá MG Brazil

ISBN: (纸本)9781424418749

This paper proposes a SOM-based hierarchical neural model to the problem of short-term load forecasting. The neural model is made up of two self-organizing map nets - one on top of the other. It has been successfully applied to domains which require time series analysis. The model was trained and assessed on load data extracted from a Brazilian electric utility. It was required to predict once every hour the electric load during the next 24 hours. The paper presents the results, and evaluates them.

关键词： Self organizing maps

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