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CSE Special Australasian Issue—Guest Editorial

computer Science Education 2000年第2期10卷 107页

作者： John Fulcher David Carrington School IT and Computer Science and Intelligent Systems Research Group University of Wollongong NSW 2522 Australia Dept. Computer Science and Electrical Engineering and Software Verification Research Centre University of Queensland QLD 4072 Australia

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关键词： computer science PROBLEM-based learning NEURAL networks (computer science) HIGHER education

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Uniform execution environment for dynamic reconfiguration

Uniform execution environment for dynamic reconfiguration

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International Conference and Workshop on engineering of computer-Based systems

作者： T. Bapty J. Scott S. Neema J. Sztipanovits Institute for Software Integrated Systems Department of Electrical and Computer Engineering Vanderbilt University Nashville TN USA

Modern high-performance embedded systems face many challenges. systems must function in rapidly changing environments. Power/size constraints limit hardware size, while extreme performance requirements demand algorithm specific architectures. Hardware architectures must structurally adapt to achieve high performance with changing algorithms. Reconfigurable computing devices offer the promise of architectures that change in response to the changing environment. The primary difficulty in this approach lies in system design. A model-integrated approach is used in the design capture and synthesis of these systems. The target systems are built on a heterogeneous computing platform including configurable hardware, ASIC and general purpose processors and DSPs. This project is a DARPA Adaptive Computing systems funded effort, involving close cooperation with US ARMY/AMICOM.

关键词： Hardware computer architecture Embedded system Military computing Adaptive systems Embedded software software systems Application specific integrated circuits Digital signal processing electrical capacitance tomography

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A cognitive model for context dependent fuzzy knowledge

A cognitive model for context dependent fuzzy knowledge

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： K.M. Eksioglu G. Lachiver Systems Software Unit Institut de recherche d''Hydro-Québec Varennes QUE Canada Electrical & Computer Engineering Department Sherbrooke University Sherbrooke QUE Canada

Context dependency is an important problem of knowledge. Fuzzy information also suffers from this dependency when any fuzzy concept, once described, is isolated from its context. The paper describes a cognitive model in which fuzzy knowledge is processed with respect to its surrounding context. The model is derived from some psycho-cognitive approaches: the integrity of knowledge and its context as well as the episodic character of contextual effects on knowledge. The model consists of some functional modules performing related cognitive tasks. Fuzzy knowledge is kept within a layered long-term memory. Layers form an episodic base for contextual knowledge: each layer represents a different context and keeps related fuzzy knowledge. A context selector module evaluates existence of context information in order to choose appropriate context layers. An aggregation module which is an optimization module evaluates implicit contexts. The model is supported by a car brake example, which shows its simplicity and adaptability, and thus the power of this cognitive model. The model is useful especially for mobile fuzzy system applications where knowledge on environment conditions are constantly changing and adaptation of the fuzzy system's descriptive aspects are necessary.

关键词： Context modeling Fuzzy logic Power system modeling System software Psychology Fuzzy systems Upper bound Temperature Knowledge representation Information processing

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Optimising zig-zags in maze-routing algorithm

Optimising zig-zags in maze-routing algorithm

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IEEE International Conference on systems, Man and Cybernetics

作者： N. Mani B. Srinivasan Department of Electrical and Computer Systems Engineering Monash University VIC Australia School of Computer Science and Software Engineering Monash University VIC Australia

Lee's algorithm (1961) for routing always finds a minimum length path, if one exists. We discuss an enhancement to an earlier maze-routing algorithm to reduce the number of zig-zag line segments in the routing path. This method would find a path between two points, if one exists, on a rectangular grid of cells. A line search method using efficient data structures has been applied that would reduce the number of line segments in the path. Blocking cells are introduced as obstacles in finding the path. All line segments are considered as horizontal and vertical only. An implementation of the method and its experimental results are reported.

关键词： Routing Wiring Topology Printed circuits Pins Wire Metalworking machines Labeling

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Fuzzy-timing Petri net model for distributed multimedia synchronization

Fuzzy-timing Petri net model for distributed multimedia sync...

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IEEE International Conference on systems, Man and Cybernetics

作者： Yi Zhou T. Murata Concurrent Software Systems Laboratory Department of Electrical Engineering and Computer Science University of Illinois Chicago Chicago IL USA

This paper presents a new fine-grained temporal Petri net model for distributed multimedia synchronization that can handle fuzzy temporal requirements and facilitate to verify the possibility of satisfying QoS requirements. We present a procedure for constructing the fine-grained model, starting from a set of relative temporal relations among multimedia objects. And we give an approach to infer unknown durations. Finally, we discuss how to model intra-stream and inter-stream synchronizations so as to guarantee the QoS.

关键词： Streaming media Multimedia databases Quality of service Timing Multimedia systems Nonhomogeneous media Jitter software systems Laboratories Fuzzy systems

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A performance evaluation protocol for graphics recognition systems 2nd

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2nd International Workshop on Graphics Recognition, GREC 1997

作者： Phillips, Ihsin T. Liang, Jisheng Chhabra, Atul K. Haralick, Robert Department of Computer Science Software Engineering Seattle University SeattleWA98122 United States Department of Electrical Engineering University of Washington SeattleWA98195 United States Bell Atlantic Network Systems Advanced Technology 500 Westchester Avenue White PlainsNY10604 United States

ISBN: (纸本)3540643818

This paper defines a computational protocol for evaluating the performance of raster to vector conversion systems. The graphical entities handled by this protocol are continuous and dashed lines, arcs, and circles, and text regions. The protocol allows matches of the type one-to-one, one-to-many, and many-to-one between the ground truth and the recognition results. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Artificial intelligence

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Efficient algorithms for delay-bounded minimum cost path problem in communication networks

Efficient algorithms for delay-bounded minimum cost path pro...

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International Conference on High Performance Computing

作者： G. Kumar N. Narang C.P. Ravikumar Computer Science Department University of Maryland College Park MD USA Hughes Software Systems Limited Gurgaon Haryana India Department of Electrical Engineering Indian Institute of Technology New Delhi India

As the amount of data transmitted over a network increases and high bandwidth applications requiring point to multipoint communications like videoconferencing, distributed database management or cooperative work become widespread, it becomes very important to optimize network resources. One such optimization is multicast tree generation. The problem of generating a minimum cost multicast tree given the network topology and costs associated with the connecting links can be modelled as a Steiner tree problem which is NP-complete. Much work has been done in the direction of obtaining near-optimal multicast trees when the objective is only to minimize the cost. However, many real time applications such as videoconferencing require that data be sent within prespecified delay limits in order to avoid problems such as anachronism and lack of synchronization. We deal with the delay-bounded cost-optimal multicast tree (DBCPAT) generation problem. Specifically, we discuss a closely related problem which is to find a delay-bounded cost-optimal path (DBCP) between a specified source and destination node. Such a path can be used as a starting point to solve the DBCMT. We present an exact solution to the DBCP which is based on the branch-and-bound paradigm. We also propose a heuristic technique to solve the DBCP using the principle of evolutionary computing. The results obtained using the two techniques are compared for several large networks.

关键词： Delay Costs Teleconferencing Multicast algorithms Bandwidth Distributed databases Resource management Collaborative work Network topology Joining processes

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Channel estimation using discrete Fourier transform techniques

Channel estimation using discrete Fourier transform techniqu...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： C. Tellambura M.G. Parker S.K. Barton School of Computer Science and Software Engineering Monash University Australia Code Theory Group Inst. for Informatikk University of Bergen Norway Institute of Integrated Information Systems School of Electronic and Electrical Engineering University of Leeds Leeds UK

This paper addresses the problem of selecting the optimum training sequence for channel estimation in communication systems over time-dispersive channels. By processing in the frequency domain, a new explicit form of search criterion is found, the gain loss factor (GLF), which minimises the variance of the estimation error and is easy to compute. Theoretical upper and lower bounds on the GLF are derived. An efficient directed search strategy and optimal sequences up to length 42 are given. These sequences are optimal only for frequency domain estimation, not for time domain estimation.

关键词： Channel estimation Discrete Fourier transforms Frequency domain analysis Wiener filter White noise Discrete transforms computer science software engineering Information systems Estimation error

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Royal Academy of Medicine in Ireland - Section of Bioengineering - Proceedings of meeting held in Dundalk, Co. Louth, in February 1998.

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IRISH JOURNAL OF MEDICAL SCIENCE 1998年第4期167卷 256-276页

作者： [Anonymous] Orthopaedic Research Unit The Queen’s University of Belfast School of Biomedical Sciences The Queen’s University of Belfast Howmedica International Ltd. Raheen Industrial Estate Limerick Department of Mechanical Engineering Trinity College Dublin 2 Mater Hospital Dublin 7 Orthopaedic Research Laboratory Århus University Hospital Denmark University of Limerick Limerick Limerick Regional Hospital Raheen Limerick Boston Scientific Ireland Ltd. Galway Department of Mechanical Engineering University College Dublin Dublin Department of Electrical and Electronic Engineering University College Dublin Dublin Bioengineering Research Centre Department of Mechanical Engineering University College Dublin Dublin Northern Ireland Bio-Engineering Centre (NIBEC) School of Electrical and Mechanical Engineering University of Ulster Newtownabbey Department of Mechanical & Manufacturing Engineering The Ashby Building The Queen’s University of Belfast Johnson and Johnson Professional Orthopaedic Division Queensway England Department of Cardiology and Department of Medical Physics & Bioengineering St. James’s Hospital Dublin 8 Burke House Ellison Street Castlebar Royal College of Surgeons in Ireland Department of Surgery Beaumont Hospital Dublin Department of Electronic and Electrical Engineering Trinity College Dublin 2 Department of Aeronautical Engineering The Queen’s University of Belfast Vascular Unit Belfast City Hospital Department of Medical Physics and Bioengineering St. James’s Hospital Dublin 8 Centre for Biomedical Electronics Department of Electronic and Computer Engineering University of Limerick Limerick Department of Mechanical and Aeronautical Engineering University of Limerick Limerick School of Health Sciences University of Ulster Ireland School of Physiotherapy University of Ulster Newtownabbey Clinical Engineering NI Medical Physics Agency Belfast and Radiology Royal Victoria Hospital Musgrave Park Hospital University of Limerick Biomedical Institute (ULBMI) Uni

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An optimal bandwidth allocation strategy for the delivery of compressed prerecorded video

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MULTIMEDIA systems 1997年第5期5卷 297-309页

作者： Feng, WC Jahanian, F Sechrest, S Software Systems Research Lab Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan USA e-mail: {wuchifarnamsechrest}@eecs.umich.edu. US

The transportation of prerecorded, compressed video data without loss of picture quality requires the network and video servers to support large fluctuations in bandwidth requirements. Fully utilizing a client-side buffer for smoothing bandwidth requirements can limit the fluctuations in bandwidth required from the underlying network and the video-on-demand servers. This paper shows that, for a fixed-size buffer constraint, the critical bandwidth allocation technique results in plans for continuous playback of stored video that have (1) the minimum number of bandwidth increases, (2) the smallest peak bandwidth requirements, and (3) the largest minimum bandwidth requirements. In addition, this paper introduces an optimal bandwidth allocation algorithm which, in addition to the three critical bandwidth allocation properties, minimizes the total number of bandwidth changes necessary for continuous playback. A comparison between the optimal bandwidth allocation algorithm and other critical bandwidth-based algorithms using 17 full-length movie videos and 3 seminar videos is also presented.

关键词： video-on-demand bandwidth allocation MPEG video compression smoothing

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