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7th IEEE Workshop on Future Trends of distributed Computing systems, FTDCS 1999

作者： Eliassen, Frank Andersen, Anders Blair, Gordon S. Costa, Fabio Coulson, Geoff Goebel, Vera Hansen, Øivind Kristensen, Tom Plagemann, Thomas Rafaelsen, Hans Ole Saikoski, Katia B. Yu, Weihai Department of Informatics University of Oslo Norway Distributed Multimedia Research Group Computing Department Lancaster University United Kingdom Department of Computer Science University of Tromsø Norway Faculty of Engineering Agder College Grimstad Norway

ISBN: (纸本)076950468X

Middleware technologies such as CORBA or Java RMI have proved their suitability for "standard" client-server applications. However, challenges from existing and new types of applications, including support for multimedia real-time requirements and mobility seems to indicate the need for defining a new architecture for open distributed systems. The new architecture should be designed from the beginning with flexibility and adaptability in mind. This can be achieved by defining an open engineering middleware platform that is run time configurable and allows inspection and adaptation of the underlying components. This paper proposes a next generation middleware architecture that conforms to requirements as indicated above. This architecture is characterised by being open, and adaptable based on the principle of reflection. The paper also reports on some existing research prototypes with a focus towards their suitability as next generation middleware. © 1999 IEEE.

关键词： Middleware

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Building test cases for use in hypersequential programming

Building test cases for use in hypersequential programming

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IEEE International Workshop on Software Engineering for Parallel and distributed systems

作者： Rudram Croll Uchihira Communications and Distributed Systems Research Group Department of Computer Science University of Sheffield UK Research and Development Center Toshiba Corporation Kawasaki Japan

A novel concurrent programming paradigm called hypersequential programming (HSP) is being developed. HSP aims to eliminate all undesirable behaviours from a given application. A fundamental part of that system requires the use of test cases for the serialization of a program. Only those test cases found to be correct are used in the final concurrent program. Therefore, HSP relies on all the functionality being included into a program. This is opposite to traditional software engineering practice, which is to ensure that all unwanted behaviours have been removed. We briefly examine the HSP method with reference to test cases and scenarios. We examine a couple of brief examples and discuss the limitations of test cases, with particular respect to HSP. We conclude that finding a method of ensuring the correct set of test cases is used in development is essential to the success of HSP.

关键词： Parallel programming

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Empirical models for estimating land cover areas from remotely sensed imagery

Empirical models for estimating land cover areas from remote...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： H.G. Lewis M.S. Nixon Image Speech and Intelligent Systems Research Group Department of Electronics and Computer Science University of Southampton Southampton UK

The mapping of land cover and land use is a key application of remotely sensed data. Traditionally, classification techniques are used to assign every pixel of an image to one of a number of mutually exclusive land cover classes. Alternatively, a modelling approach assigns to every pixel the area proportion containing each land cover class. This paper examines the hypothesis that the area modelling, or area estimation, approach can offer a richer and qualitatively more accurate representation of the true land cover than can be provided by the traditional classification approach. The paper describes the empirical, non-linear classifiers and area estimation models, based on neural networks and nearest neighbour algorithms, that have been developed to investigate this hypothesis. The algorithms were applied to an area-labelled Landsat TM data set produced as part of the EU FLIERS Project. The results demonstrated that a better representation of the true land cover was obtained using the area estimation models compared to the representation produced by the classification algorithms when the size of the land cover objects on the ground was less than the resolution of the sensor. These results are presented with a discussion of the evaluation issues involved with area estimation.

关键词： Neural networks Satellites Remote sensing Classification algorithms Pixel Probability Pattern recognition Speech Intelligent systems computer science

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Recursive Bayesian modelling of time series by neural networks

Recursive Bayesian modelling of time series by neural networ...

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1999 Ninth International Conference on Artificial Neural networks ICANN 99. (Conf. Publ. No. 470)

作者： T. Dodd C. Harris Image Speech and Intelligent Systems Research Group Department of Electronics and Computer Science University of Southampton Southampton UK

The Bayesian interpretation of regularisation is now well established for batch processing of data by neural networks. However, when the data arrives sequentially the most common approach is still to use least-squares based algorithms. Previous work has suggested the use of Kalman filter based algorithms for training neural networks under sequential learning with regularisation. We examine specifically the class of approximation schemes known as general linear models. In this case the Bayesian learning of the network weights with Gaussian approximations leads to a Kalman filter algorithm for the weights. The Kalman filter iteratively learns the probability density of the weights and incorporates online regularisation. We investigate the application of this technique to two time series problems, one an illustrative demonstration problem, the second motivated by an analytical model of slender delta wings.

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Next generation middleware: requirements, architecture, and prototypes

Next generation middleware: requirements, architecture, and ...

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IEEE Workshop on Future Trends of distributed Computing systems

作者： F. Eliassen A. Andersen G.S. Blair F. Costa G. Coulson V. Goebel O. Hansen T. Kristensen T. Plagemann H.O. Rafaelsen K.B. Saikoski Weihai Yu Department of Informatics University of Oslo Norway Distributed Multimedia Research Group Computing Department Lancaster University UK Faculty of Engineering Agder University College Grimstad Norway Department of Computer Science University of Tromsø Norway

关键词： Middleware Prototypes Application software Multimedia computing Java computer architecture distributed computing Mobile computing Programming profession Informatics

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A smoothing proxy service for variable-bit-rate streaming video

A smoothing proxy service for variable-bit-rate streaming vi...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： J. Rexford S. Sen A. Basso Networking & Distributed Systems AT and T Research Laboratories Florham Park NJ USA Department of Computer Science University of Massachusetts Amherst MA USA Speech & Image Processing AT and T Research Laboratories Red Bank NJ USA

Provisioning network resources for multimedia streaming is complicated by the bursty, high-bandwidth traffic introduced by compressed video, as well as the variability of the throughput, delay, and loss properties of the Internet, and the lack of end-to-end control by any one service provider. To address these problems, we propose that proxies should perform online smoothing by transmitting frames into the client playback buffer in advance of each burst, to reduce network resource requirements without degradation in video quality. This paper describes the practical systems issues we have encountered in building a smoothing proxy service using off-the-shelf components, in the context of an MPEG-2/RTP streaming testbed.

关键词： Smoothing methods Streaming media Video compression Communication system traffic control Throughput IP networks Web and internet services Degradation Context-aware services System testing

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Requirements and the concept of cooperative system management

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International Journal of Network Management 1998年第3期8卷 139-158页

作者： Bhushan, Bharat Patel, Ahmed Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Belfield Dublin 4 Ireland.

Cooperation among various types of management functions is necessary to allow management functions to interwork in providing and using information services for systems management. To understand these tasks from the point of view of cooperative working, this article discusses the requirements and presents the concept of cooperative system management.

关键词： Management information systems

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A plug-in architecture providing dynamic negotiation capabilities for mobile agents

A plug-in architecture providing dynamic negotiation capabil...

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2nd International Workshop on Mobile Agents, MA'98

作者： Tu, M.T. Griffel, F. Merz, M. Lamersdorf, W. Distributed Systems Group Computer Science Department University of Hamburg Vogt-Kölln-Str. 30 D-22527 Hamburg Germany

ISBN: (纸本)354064959X

The diversity of research and development work on agent technology has led to a strong distinction between mobile and intelligent agents. This paper presents an architecture aiming at providing a step towards the integration of these two aspects, concretely by providing an approach of dynamically embedding negotiation capabilities into mobile agents. In particular, the requirements for enabling automated negotiations including negotiation protocols and strategies, a plug-in component architecture for realizing such requirements on mobile agents, and the design of negotiation support building blocks as components of this architecture are presented.

关键词： Mobile agents

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New object models for seamless transition across heterogeneous mobile environments

New object models for seamless transition across heterogeneo...

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International Workshop on Database and Expert systems Applications

作者： A. Pasala D. Janaki Ram Distributed & Object Systems Group Department of Computer Science and Engineering Indian Institute of Technology Chennai India

In mobile collaborative applications, collaborators may move across heterogeneous environments. This paper proposes object models for seamless transition of collaborators across heterogeneous environments. This is achieved by framing the various limitations of the environment as constraints and abstracting them into a constraint meta-object. Collaborator objects are dynamically customized by attaching the appropriate constraint meta-object based on the environment in which the collaborators are working. Remote customization of objects is achieved by 'distributed glue model'.

关键词： Collaborative work Collaboration Mobile computing computer science Application software Joining processes Wireless communication Physics computing Wireless networks Error analysis

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The prototype of continuous media file system, CrownFS

The prototype of continuous media file system, CrownFS

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International Conference on Information Networking

作者： Se-Jin Hwang Jin-Uok Kim Myong-Soon Park Oh-Young Kwon Tae-Geun Kim Computer Systems Laboratory Computer Science Department Korea University Seoul South Korea Distributed Computing Laboratory Network Computing Department Systems Engineering Research Institute Daejeon South Korea

ISBN: (纸本)0818672250

Currently, many multimedia or continuous media server system is under development on top of either workstations or high-end PCs clustered with high speed networking facilities. In this paper we introduce Crown, a continuous media server on clustered high performance PCs with Myrinet, fast network switching equipment, and then address CrownFS, a file system on top of Crown, to offer continuous media streams to many subscribers at the same time. For easy and rapid tuning of the performance of CrownFS, we prototyped it. Prototyping requires less efforts and costs than direct implementation. Also, more reliable system optimization is obtainable rather than simulation. By using the prototype, we measured the scalability of CrownFS according to disk access strategies.

关键词： Prototypes File systems Streaming media Network servers Personal communication networks Multimedia systems Workstations High-speed networks File servers Costs

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