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IEEE International Workshop on Enabling Technologies: Infrastructure for Collaborative Enterprises (WET ICE)

作者： N. Julian E.M. Raybourn J.P.H. Huang Sch. of Comput. & Math. Sci. Glasgow Caledonian Univ. UK Fraunhofer FIT Sankt Augustin Germany Fraunhofer FIT Sankt Augstin Germany School of Computing and Mathematical Sciences Glasgow Caledonian University Glasgow UK

This paper summarizes the fourth Evaluating Collaborative Enterprises (ECE) workshop, held as part of the 12th IEEE International Workshops on Enabling Technologies: Infrastructure for Collaboration conference (WETICE 2003), at the Johann Keppler University, Linz, Austria. This paper introduces the seven papers presented and summarizes the presentations and ensuing discussions of the participants of the ECE workshop. In addition to the discussions following the papers, a panel session was held. This report sets the scene by summarizing the development of the Evaluation workshops over the past four years, and assesses the current state of practice in Evaluation of Collaborative Enterprises. Paper topics in this workshop addressed evaluation at different stages of the development process and evaluation methodologies at groupware evaluation. Discussion addressed effectiveness measurement, selection of appropriate instruments and different perspectives from group members.

关键词： Collaborative work Software engineering Software performance

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Purely-long-range bound states of He(2s3S)+He(2p3P)

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Physical Review A - Atomic, Molecular, and Optical Physics 2003年第2期68卷 227061-227066页

作者： Venturi, V. Leo, P.J. Tiesinga, E. Williams, C.J. Whittingham, I.B. Atomic Physics Division Natl. Inst. of Stand. and Technology Gaithersburg MD 20899 United States Sch. of Math. and Physical Sciences James Cook University Townsville Qld. 4811 Australia

The presence and positions of purely-long-range bound states of4He(2s3S)+4(2p3P) near the 2s3S1+2p3P0.1atomic limit was studied. The results of the full multichannel and approximate models were compared. It was found ... 详细信息

关键词： Atomic physics

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Invariant solutions of the black-sch.les equation

Invariant solutions of the black-scholes equation

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作者： Pooe, C.A. Mahomed, F.M. Soh, C. Wafo Intl. Inst. Symmetry Anal./Math. M. Department of Mathematical Sciences University of North-West Mafikeng South Africa Ctr. Different. Equat. C.M.A. Sch. of Compl./Applied Mathematics University of the Witwatersrand Wits 2050 Johannesburg South Africa

As the Black-sch.les equation can be transformed into the one-dimensional linear heat equation via two sets of transformations, an optimal system of one- -dimensional subalgebras for the one-dimensional heat equation is exploited to obtain two classes of optimal systems of one-dimensional subalgebras for the well-known Black-sch.les equation of the math.matics of finance. Two methods for the derivation of the two classes of optimal systems of group-invariant solutions for this model are available. We present the simpler approach.

关键词： Computational methods

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Optical fibre flow-sensor for composites manufacturing

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Advanced Composites Letters 2003年第5期12卷 211-215页

作者： Lekakou, C. Cook, S. Ang, T.W. Reed, G.T. School of Engineering University of Surrey Guildford Surrey GU2 7XH United Kingdom SCRIBA Sch. of Electron. Computing/Math. University of Surrey Guildford Surrey GU2 7XH United Kingdom

An optical fibre has been used as an intensity-based sensor for the monitoring of the fluid front infiltrating a reinforcing fibre mat in composites manufacturing. The sensor length comprised the fibre core, initially surrounded by air or vacuum and subsequently covered by the infiltrating fluid. Two configurations were tested where a step-change or a continual output signal was obtained, respectively. In the latter case, the sensor used in this study demonstrates an improvement of up to two orders of magnitude over conventional monitoring techniques used for this application. This performance is coupled with more obvious advantages of low cost, compatibility with composite fabrication, and ease of use.

关键词： Fiber optic chemical sensors

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Nonlinear dynamics of a system of coupled oscillators with essential stiffness nonlinearities

Nonlinear dynamics of a system of coupled oscillators with e...

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2003 ASME Design Engineering Technical Conferences and Computers and Information in Engineering Conference

作者： Vakakis, Alexander F. Rand, Richard H. Division of Mechanics Sch. of Appl. Math./Phys. Sciences Natl. Technical University of Athens P.O.Box 64042 GR-157 10 Zografos Greece Department of Mechanical Engineering University of Illinois 1206 W. Green Street Urbana IL 61801 United States Department of Theoretical Mechanics Cornell University Ithaca NY 14853 United States

We study the resonant dynamics of a two-degree-of-freedom system composed a linear oscillator weakly coupled to a strongly nonlinear one, with an essential (nonlinearizable) cubic stiffness nonlinearity. For the undamped system this leads to a series of internal resonances, depending on the level of (conserved) total energy of oscillation. We study in detail the 1:1 internal resonance, and show that the undamped system possesses stable and unstable synchronous periodic motions (nonlinear normal modes - NNMs), as well as, asynchronous periodic motions (elliptic orbits - EOs). Furthermore, we show that when damping is introduced certain NNMs produce resonance capture phenomena, where a trajectory of the damped dynamics gets 'captured' in the neighborhood of a damped NNM before 'escaping' and becoming an oscillation with exponentially decaying amplitude. In turn, these resonance captures may lead to passive nonlinear energy pumping phenomena from the linear to the nonlinear oscillator. Thus, sustained resonance capture appears to provide a dynamical mechanism for passively transferring energy from one part of the system to another, in a one-way, irreversible fashion. Numerical integrations confirm the analytical predictions.

关键词： Dynamics

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Clinical knowledge management for healthcare

Clinical knowledge management for healthcare

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IEEE EMBS International Conference on Information Technology Applications in Biomedicine (ITAB)

作者： A. Dwivedi R.K. Bali R.N.G. Naguib N.S. Nassar Department Information Systems and Computing Brunel University Uxbridge UK ChorleyWood Health Centre Chorleywood UK Coventry University Coventry West Midlands GB Sch. of Math. & Inf. Sci. Coventry Univ. UK

A quiet transformation has taken place in health related research in the last twenty-five years. This transformation can be traced to the coming of age of new scientific domains like bioinformatics and cybernetics which have evolved thanks to trans-disciplinary research. The success of the human genome project is perhaps the most significant pointer of this silent transformation. We believe that in the future, as a result of synergistic interaction between bioinformatics and other paradigms, healthcare systems would have an increased interest in knowledge recycling of the collaborative learning process acquired from practices. In this context, the knowledge management (KM) paradigm could assist twenty-first century clinical practitioners to acquire proficiency in understanding and interpreting clinical information so as to attain knowledge and wisdom whilst dealing with large amounts of clinical data.

关键词： Medical services Telemedicine Medical diagnostic imaging Hospitals Information systems Collaboration Cardiology Atherosclerosis Appropriate technology Biomedical equipment

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Comparing Parallel Functional Languages: Programming and Performance

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Higher-Order and Symbolic Computation 2003年第3期16卷 203-251页

作者： Loidl, H.-W. Rubio, F. Scaife, N. Hammond, K. Horiguchi, S. Klusik, U. Loogen, R. Michaelson, G.J. Peña, R. Priebe, S. Rebón, A.J. Trinder, P.W. Sch. of Math. and Computer Sciences Heriot-Watt University Edinburgh EH14 4AS United Kingdom Dpto. Sistemas Informáticos Universidad Complutense de Madrid 28040 Madrid Spain Japan Adv. Inst. for Sci./Technology 1/8 Asahidai Nomigun Ishikawa 923-1211 Japan School of Computer Science University of St. Andrews Fife KY16 9SS United Kingdom Fb. Mathematik und Informatik Phlipps-Universität Marburg D-35032 Marburg Germany

This paper presents a practical evaluation and comparison of three state-of-the-art parallel functional languages. The evaluation is based on implementations of three typical symbolic computation programs, with performance measured on a Beowulf-class parallel architecture. We assess three mature parallel functional languages: PMLS, a system for implicitly parallel execution of ML programs;GpH, a mainly implicit parallel extension of Haskell;and Eden, a more explicit parallel extension of Haskell designed for both distributed and parallel execution. While all three languages employ a completely implicit approach to communication, each language takes a different approach to specifying and controlling parallelism, ranging from explicit identification of processes as language constructs (Eden) through annotation of potential parallelism (GPH) to automatic detection of parallel skeletons in sequential code (PMLS). We present detailed performance measurements of all three systems on a widely available parallel architecture: a Beowulf cluster of low-cost commodity workstations. We use three representative symbolic applications: a matrix multiplication algorithm, an exact linear system solver, and a simple ray-tracer. Our results show how moderate speedups can be achieved with little or no changes to the sequential code, and that parallel performance can be significantly improved even within our high-level model of parallel functional programming by controlling key aspects of the program such as load distribution and thread granularity.

关键词： Computer programming languages

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Nanostructured (CoxFe1-x)3-yO4 spinel - Mechanochemical synthesis

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Zeitsch.ift fuer Metallkunde/Materials Research and Advanced Techniques 2003年第10期94卷 1127-1133页

作者： Wu, E. Campbell, Stewart J. Kaczmarek, W.A. Hofmann, M. Kennedy, S.J. Sch. of Phys. Environ./Math. Sci. University of New South Wales Australian Defence Force Academy Canberra Australia Institute of Metal Research Chinese Academy of Sciences China Res. Sch. of Phys. Sci./Engineering Australian National University Canberra Australia Tech. Universität München Garching Germany Rutherford Appleton Laboratory ISIS Facilities United Kingdom Australian Nucl. Sci./Technol. Org. Menai Australia Sch. of Phys. Environ./Math. Sci. University of New South Wales Australian Defence Force Academy Canberra ACT 26000 Australia

The effects of wet-milling mixtures of α-Fe2O3 and cobalt hydroxide Co(OH)2 over a range of Co/Fe ratios for 215 h have been investigated by neutron diffraction and Mössbauer spectroscopy. The starting materials were mixed according to the stoichiometric formula (CoxFe1-x)3O4 for values of x = 0.037, 0.071, 0.133, 0.234 and 0.380 (i.e., from Co0.1Fe 2.9O4 to the cobalt spinel CoFe2O4). These studies reveal the formation of a nanostructured, mixed Co-Fe spinel phase with non-stoichiometric composition (CoxFe1-x) 3-yO4;the defect spinels have refined values x c = 0.04, 0.08 and 0.14 for the mixtures with the lowest Co content (x = 0.037, 0.071 and 0.133) and defect concentrations in the range y 0.1-0.2. Both the spinel phase and un-reacted α-Fe2O 3 are found to occur in the neutron diffraction patterns and Mössbauer spectra for the high Co content mixtures x = 0.234 and x = 0.380. Rietveld refinements of the neutron data indicate that the Co atoms predominantly occupy the octahedral B sites with vacancies also found to be located on the octahedral B sites. Analyses of the Mössbauer spectra of the milled samples confirm the existence of vacancy defects in the B sites and reveal that the vacancies cause similar effects to those of the Co ions, leading to a higher average charge state per iron atom.

关键词： Cobalt compounds

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computing the Betti numbers of arrangements

Computing the Betti numbers of arrangements

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Proceedings of the 34th Annual ACM Symposium on Theory of computing

作者： Basu, Saugata Sch. of Math. and Coll. of Computing Georgia Institute of Technology Atlanta GA United States

In this paper, we consider the problem of computing the Betti numbers of an arrangement of n compact semi-algebraic sets, S1,..., Sn ⊂ k, where each Si is described using a constant number of polynomials with degrees bounded by a constant. Such arrangements are ubiquitous in computational geometry. We give an algorithm for computing -th Betti number, β(∪iSi), 0 ≤ ≤ k - 1, using O(n+2) algebraic operations. Additionally, one has to perform linear algebra on matrices of size bounded by O(n+1). All previous algorithms for computing the Betti numbers of arrangements, triangulated the arrangement giving rise to a complex of size O(n2k) in the worst case. To our knowledge this is the first algorithm for computing β(∪iSi) that does not rely on such a global triangulation, and has a graded complexity which depends on .

关键词： Computational geometry

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An adaptive chaotic neural network

An adaptive chaotic neural network

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2002 International Joint Conference on Neural Networks (IJCNN'02)

作者： Crook, Nigel sch.per, Tjeerd olde Neurocomputing Research Group Sch. of Computing and Math. Sci. Oxford Brookes University Oxford United Kingdom

The non-linear dynamics of a chaotic attractor offer a number of useful features to the developer of neuromorphic systems. Included in these is the ability for efficient memory storage and recall. A chaotic attractor has a potentially infinite number of Unstable Periodic Orbits (UPO) embedded within it. These orbits can be stabilised with the application of delayed feedback inhibition. This research investigates the possibility of using such delayed feedback in a network to stabiles different UPOs in response to disparate input stimuli. A key feature of the models presented is that the UPOs, which correspond to dynamic memory states, emerge from the dynamics of the attractor. The paper presents two learning rules which support the network dynamics from which the memory states emerge.

关键词： Multilayer neural networks

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