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19-22 March 1990

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Displaying Results 1 - 25 of 67
  • Using reservation-virtual-time-CSMA with split-channel reservation for packet voice and data

    Publication Year: 1990, Page(s):209 - 212
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (171 KB)

    The carrier sense multiple access with collision detection (CSMA/CD) protocol, originally developed for data transmission is not very effective for the transmission of voice packets due to excessive packet delays at moderate to high loads. It has been shown by C.T. Lea, J.S. Heditch (1987), that the problem of delays can be greatly reduced by using a variation of CSMA called reservation-virtual-ti... View full abstract»

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  • A shared-memory execution model for parallel functional programming

    Publication Year: 1990, Page(s):247 - 250
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (227 KB)

    Functional languages have received more interest recently and particularly for programming parallel computers. Traditionally, functional languages were developed simultaneously with the design of new architectures such as data flow and reduction machine. The authors present a general execution model to support a parallel functional language called SISAL (stream and iteration in a single assignment... View full abstract»

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  • High-speed bipolar technology

    Publication Year: 1990, Page(s):190 - 195
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (360 KB)

    Developments in silicon bipolar and GaAlAs/GaAs heterojunction bipolar technologies are reviewed and the performance of the two technologies for high-speed ECL circuits are compared. The gate delays for state-of-the-art circuits are estimated using an analytical equation, which expresses the gate delay as a linear weighted sum of all the time constants in the circuit. A common idealised transistor... View full abstract»

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  • Some applications of formal methods to the design of distributed knowledge base systems

    Publication Year: 1990, Page(s):133 - 138
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    The paper describes a technique for formally defining the semantics of a knowledge base language-the Vienna development method (VDM). The technique is shown to have applications in query optimisation and in the maintenance of consistency of the knowledge. The paper suggests that the same approach can help in the development of translators between different knowledge models. It is also anticipated ... View full abstract»

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  • WASP: a demonstrated wafer scale technology

    Publication Year: 1990, Page(s):184 - 189
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    The authors review WASP 1 and discuss the WASP 2a and WASP 2b wafer scale integration (WSI) massively parallel processor technology demonstrators, implemented in standard CMOS technology. These latter devices are defect-tolerant arrays of 864 and 6480 processing elements and integrate 1.26 M transistors (4 cm×4 cm) and 8.43 M transistors (10 cm×10 cm). The two variants (WASP 2a and WAS... View full abstract»

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  • A knowledge-based architecture for project planning and control

    Publication Year: 1990, Page(s):125 - 132
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (496 KB)

    In order to establish the requirements of an AI project model, the concepts involved in project administration, and the process of project planning must first be introduced. In doing so, the key features that an AI system must assess are drawn out and the foundations for the development of the AI model are laid. The paper outlines the requirements for a project management modelling methodology, in... View full abstract»

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  • Integrated computer vision with the associative string processor

    Publication Year: 1990, Page(s):79 - 86
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (512 KB)

    The paper describes a modular, highly versatile and cost-effective massively parallel processing architecture, the ASP (associative string processor), its application to integrated computer vision and reports its performance to a number of independent computer vision and image understanding tasks View full abstract»

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  • A mixed-mode circuit simulator

    Publication Year: 1990, Page(s):390 - 393
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    The design of mixed analogue and digital integrated circuits requires tools capable of handling not only the two types of circuits, but also the interfaces between the two types. The paper describes a prototype mixed-mode simulator. By integrating analogue and digital simulator algorithms, the interfaces between the two are accurately modelled, while maintaining the accuracy of the analogue simula... View full abstract»

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  • Computational hyphenation

    Publication Year: 1990, Page(s):352 - 357
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    The paper presents an overview of the role of hyphenation in computational environment. The work is a summary of an existing application. An overview of the language independent system is presented and possible extensions suggested. The system is a multilingual hyphenation package which has been researched and developed at Linotype Limited for use in the graphical art/desktop publishing industry View full abstract»

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  • The new programming model for parallel machines

    Publication Year: 1990, Page(s):177 - 183
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB)

    A new model to help write programs which run concurrently in parallel machines, is discussed. This model takes the well known model of inter-communicating processes and refines it by: identifying processes with the evaluation of a function and eliminating many of the difficulties resulting from identifying processes with procedural programs; invoking process execution in two phases, ie., in the fi... View full abstract»

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  • Flexible parallel control

    Publication Year: 1990, Page(s):117 - 124
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    The concept of a flexible parallel structure for feedback control is described and two implementation studies are investigated. The fundamental arrangement for such controllers is a novel way in which feedback control can be arranged, further it is seen to be modern in that it ties in with present-day technology, and exciting in terms of the potential application areas which can now be investigate... View full abstract»

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  • The Ten15 project [software development]

    Publication Year: 1990, Page(s):306 - 310
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    Describes the background and progress of the Ten15 project at RSRE. The emphasis centres on the potential advantages to the software engineering community of the widespread adoption of Ten15 as a kernel for software engineering applications. Ten15 provides an algebraic basis for software development. It has three important aspects: first, it provides an interface that makes different computers com... View full abstract»

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  • Computer vision based automatic construction of 3-D geometry scene models

    Publication Year: 1990, Page(s):71 - 78
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    Describes an approach towards the automatic construction of 3-D object models using images of the scene. The method makes use of a visible surface scene representation called the 21/2 -D sketch. The implementation utilises multiple simulated 21 /2-D sketches to construct a 3-D voxel based geometric model. The depth information from each 21/ View full abstract»

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  • A control strategy for dry etch processing

    Publication Year: 1990, Page(s):387 - 389
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The article describes a control strategy for a dry etching process. The basis for this control methodology is that a dry etching stage may be described by one or more response surfaces or parametric models in a multidimensional space. The process trajectory is defined in relation to response functions (parametric models) and is maintained by the use of adaptive control algorithms. The control fact... View full abstract»

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  • Hybrid optical fibre sensors

    Publication Year: 1990, Page(s):428 - 433
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    Hybrid sensing systems are slowly becoming available on the market occupying a position between conventional electronic sensors and all-optical instruments. They combine the benefits of established sensors, such as reliability, cheapness and high performance, with the advantages of optical transmission, intrinsic safety and freedom from electromagnetic interference; a digital output improves the t... View full abstract»

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  • Recognition of handwritten Arabic mathematical formulas

    Publication Year: 1990, Page(s):344 - 351
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    The author develops a hierarchical system for the recognition of on-line Arabic mathematical symbols. A precedence grammar has been also developed for the recognition of one-dimensional Arabic mathematical formulas. The segmentation of a mathematical formula is relatively simple since all characters are isolated and each consists of one stroke only, with the exception of three symbols where each c... View full abstract»

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  • Topsy: an extensible Unix multicomputer

    Publication Year: 1990, Page(s):164 - 176
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (940 KB)

    Topsy is a message passing multicomputer architecture. It comprises a distributed Unix-compatible kernel resting on a message software system which in turn relies on a new, high speed, communications hardware. The authors present an overview of the goals of the architecture and the main design decisions, a description of the structure and major components of the operating system and the communicat... View full abstract»

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  • A systolic parameter estimator for real-time adaptive control

    Publication Year: 1990, Page(s):111 - 116
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    Describes a new systolic parameter (or constant state) estimator based upon the square root covariance Kalman filter algorithm. Parameter estimation is a fundamental component of adaptive controllers and explicit self-tuning regulators. The new architecture is compared with one proposed by Shepherd, McWhirter, and Hudson (1988), and it is shown to be potentially more attractive for parallel contro... View full abstract»

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  • Evaluation of a speech driven interface

    Publication Year: 1990, Page(s):286 - 293
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    Experiments performed on a prototype speech-driven word processor under development at ISDIP (the intelligent speech-driven interfaces project) based at Hatfield Polytechnic, are described. The objectives of the experiments were to: determine whether there is an increased level of user satisfaction associated with a speech-driven interface; determine whether there is an enhanced learnability facto... View full abstract»

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  • Definitive specification of concurrent systems

    Publication Year: 1990, Page(s):52 - 57
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    A new approach to the modelling and simulation of concurrent systems, characterised by the use of sets of definitions to represent states and transitions, is described. The simulation of system behaviour is derived from a specification of possible agent actions by taking account of relative speeds of response and operation. A distinctive feature of the approach is that the perceptions and capabili... View full abstract»

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  • Transputer-based networks for parallel distributed sensor systems

    Publication Year: 1990, Page(s):204 - 208
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    Two developing technologies that have become prominent in applied systems architectures are parallel processing and distributed networks. However, the integration of parallel computing devices within commercial and industrial networks is an emerging field with opportunities that have not been sufficiently exploited. One of the reasons for this lag can be found in the conventional thinking about th... View full abstract»

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  • The use of abstraction in automatic inference

    Publication Year: 1990, Page(s):365 - 370
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    Informally, abstraction can be described as the process of mapping a representation of a problem onto a new representation. Unfortunately, work on abstraction has on the whole remained at this informal level. The paper describes the beginnings of a theory of abstraction View full abstract»

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  • Knowledge based systems with embedded simulation components

    Publication Year: 1990, Page(s):318 - 324
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    Proposes a methodology for implementing knowledge based systems (KBS) which have embedded discrete event simulation (DES) capabilities. The paper begins with a brief review of some of the problems encountered when implementing non-trivial KBS and simulation modelling tools. The integration of KBS and simulation technologies is then proposed as a solution to some of these problems. A methodology fo... View full abstract»

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  • Software reusability using object-oriented programming

    Publication Year: 1990, Page(s):299 - 305
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (432 KB)

    Based on their experiences of OOP, the authors describe their work and current thinking, and also offer some rules of thumb. In particular they present a model for the software lifecycle in an environment based on reuse View full abstract»

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  • Real-time image analysis for vision guided vehicle control

    Publication Year: 1990, Page(s):66 - 70
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    Presents an overview of a three year investigation into vision guided road vehicle control conducted by a team at the University of Bristol. The goal was to develop a parallel computer architecture, based on the Inmos transputer, which is capable of real-time analysis of video images obtained from a camera mounted on the front of a vehicle. Much of the algorithm development is based on analysis of... View full abstract»

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