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检索条件"任意字段=IEE Colloquium on Methods and Techniques for Real-Time System Development"

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A 1-Gflop triangular pseudo-systolic processor

A 1-Gflop triangular pseudo-systolic processor

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iee colloquium on High Performance Applications of Parallel Architectures

作者： M. Johnson DRA Malvern Worcestershire UK

Modern signal processing often requires arithmetically intensive algorithms. The complexity of such algorithms and their development of 'batch processing' solutions does not, in general, provide the bandwidth or convenience required for processing signals in real-time at rates greater than a few hertz; a different approach is needed. J.G. McWhirter and T.J. Shepherd (1987) proposed a systolic architecture which provided the basis for an efficient 'flow-through' processing technique and much effort has since been devoted to the development of suitable algorithms. In particular, signal processing techniques which make use of a least-squares optimisation are often used in signal processing strategies. It was shown by McWhirter and Shepherd that the QR algorithm, used for least-squares optimisation, could be expressed in a form suited to a triangular systolic array. However, the number of systolic nodes and hence processors, in an array capable of optimising a problem with 81 unknowns, for example, would be 3321; such an array would be large and expensive. An intermediate and economically attractive alternative is to use substantially fewer processors emulating the same flow-through architecture whilst providing sufficient bandwidth; a 'pseudo-systolic' solution. Using this approach a group of nodes would share a processor.< >

关键词： Least squares methods Optimization methods Parallel algorithms Signal processing Systolic arrays

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CABLE RATING methods APPLIED TO A real-time CABLE system MONITOR

CABLE RATING METHODS APPLIED TO A REAL-TIME CABLE SYSTEM MON...

引用

3rd International Conference on Power Cables and Accessories 10kV - 500kV

作者： LARSEN, ST ONGHALL, CL STEPHENSON, PL NATL GRID CO PLC LONDONENGLAND

ISBN: (纸本)0852965923

The National Grid Company (NGC) has a national scheme to provide cable system monitors (CSMs) installed in its Area Control Centres. The CSMs will provide on-line continuous and overload thermal ratings of cables based on system measurements and real-time thermal modelling, and will enable the control engineers to assess the present security of the system and plan the operation of the system for the next day or possibly the following week. The CSM will also hold archive data for retrieval and subsequent analysis. A transient thermal cable rating method is employed in the CSM which can be applied to various cable system designs. The method is a development of that described in Electra No 87 and recommended in IEC853-2. Software has been developed for cable design calculations on an off-line system;a derivative of this software has been provided in a form suitable for inclusion in a real-time system, a SCADA system supplied by a third party. Most combinations of cable installations on one circuit can be monitored by the CSMs including cable in air, cables in tunnels, and cables buried normally, in troughs, in ducts, or with water cooling. Approximate methods for dealing with partially dried out soil and dual thermal resistivity installations can be applied to the CSM. Mutual heating effects between neighbouring circuits are included. New rating and measurement techniques will be introduced to the CSM as they become available. One aim of the CSM is to allow new cable circuits to be designed with their thermal characteristics matched to the operational and security requirements of the transmission network.

关键词： Electric cables

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A control strategy for sinusoidal supply side convertors

A control strategy for sinusoidal supply side convertors

引用

iee colloquium on developments in real-time Control for Induction Motor Drives

作者： S.R. Jones R. Jones Drives Development Department Cegelec Industrial Controls Limited Kidsgrove UK

Recent activity by legislative bodies and standards authorities within the European Community is causing an increased awareness of the problems associated with current harmonics and the resulting supply waveform distortion. As one of the main causes of this supply waveform distortion is nonlinear loads, such as 6-pulse rectifying equipment, alternative power conversion techniques, that draw continuous current from the network, need to be considered. This paper presents recent work in the development of a sinusoidal line side convertor for use with a variable speed AC drive. The paper will outline the power circuits and control system required for such a rectifier. A full explanation is provided of the strategy employed to achieve closed loop regulation of DC link voltage, a sinusoidal current waveform, full four quadrant power flow to the supply and the desired power factor. Measurements, taken from tests run on production equipment, will be used to demonstrate the performance of this rectifier.< >

关键词： Power conversion Reactive power Rectifiers Variable speed drives

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Application of dynamic positioning techniques to working class remotely operated vehicles (ROVs)

Application of dynamic positioning techniques to working cla...

引用

iee colloquium on Control and Guidance of Underwater Vehicles

作者： D.G. Langrock Mobil North Sea Limited Aberdeen UK

There are three principal reasons for the increase in the use of remotely operated vehicles (ROVs) to replace divers for subsea operations in offshore oil and gas production during the past several years. First, there has been an increased emphasis on safety. Second, an ROV and its associated support vessel can be leased for about one third of the day rate cost of that associated with divers to perform the same function. And third, hydrocarbon production is taking place in water depths greater than that accessible by divers. This replacement of divers by machines to accomplish more complex tasks has resulted in the development of more sophisticated intervention equipment and more powerful ROVs. The increase in the complexity of the subsea work coupled with more powerful vehicles has placed greater burdens on the ROV pilot. Much of the fatigue could be reduced by supplying the pilot with better information and control. With a fully developed real time navigation system, a representation of the structure could be displayed on a video monitor with the ROV shown as a moving icon on the screen. A snail's trail from the ROV icon could also be displayed indicating the location of the umbilical. The navigation task is then reduced to monitoring the video representation and verification of position by observing compass heading, and television or sonar displays. Two specific areas which have been addressed are looked at in the paper: the design of a SONAR-CAD Navigation Package and the implementation of a dynamic positioning system used in conjunction with the Marquest Group EXACT system.< >

关键词： Acoustic signal processing Navigation Position control

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Object oriented analysis: an improved real time structured analysis for telecoms system development

Object oriented analysis: an improved real time structured a...

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iee Tutorial colloquium on Formal methods and Notations Applicable to Telecommunications

作者： C.B. Carter A.S. Kennedy Founding partners of Kennedy Carter London UK

The authors look at RTSASD (real time structured analysis and structured design) which is used in software engineering for system development. They concentrate on object-oriented analysis and why it is the preferred m... 详细信息

关键词： Object oriented programming real time systems Software engineering system analysis and design Communication system software

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Formal methods in a real air traffic control project

Formal methods in a real air traffic control project

引用

iee colloquium on Software in Air Traffic Control systems - The Future

作者： A. Hall D. Isaac Praxis Systems Public Limited Company Civil Aviation Administration of China UK

The Civil Aviation Authority is introducing a major new development into the London Air Traffic Control Centre. The central control function (CCF) is based on changes to the sectorisation of airspace to improve traffic throughput by introducing the so-called 'tunnels-in-the-sky'. In support of CCF a number of computerised systems are being upgraded and new ones introduced. One of the new systems is the CCF display information system (CDIS). CDIS is a distributed real-time system running on a network of dualled computers communicating over a dual token ring local area network (LAN). The authors describe the use of formal methods in the development of CDIS.< >

关键词： Air traffic control Software requirements and specifications real time systems system analysis and design Communication system software Token networks

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Interactive real time power system simulators for training and planning purposes

Interactive real time power system simulators for training a...

引用

iee colloquium on Interactive Graphic Power system Analysis Programs

作者： P. Buxton A.R. Daniels R.W. Dunn NGC Bath University UK

Recent advances in the real time simulation of the electro-mechanical transient and dynamic behaviour of complex power systems has led to the suggestion of the use of such simulators for both operator training and planning tools. The requirements of each of these applications, in terms of user interaction speed, level of functionality and type of user interface, are quite different. The speed at which the necessary calculations for, e.g. an eighty machine power system with eight hundred busbars have to be carried out is high. The use of parallel processing techniques to achieve these high speeds has led to the practical implementation of such simulators operating in real time. Another major consideration, that of the user interface, has led to the development of advanced human computer interfaces (HCI). The authors look at both the requirements of the applications mentioned above and the necessary technology to implement appropriate interactive graphical interfaces for those applications.< >

关键词： Simulation Engineering drawings Interactive systems real time systems Training User interfaces

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The application of computed tomography techniques to imaging with transmitted and reflected ultrasound

The application of computed tomography techniques to imaging...

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iee colloquium on Applications of Image Processing in Mass Health Screening

作者： J.R. Jago T.A. Whittingham Newcastle Gen. Hospital UK

An experimental system has been constructed, based upon conventional linear arrays, to obtain both reflection and transmission data. The transmission data has been used to reconstruct images of the speed of sound distribution within various targets. It has been shown that quantitative speed of sound images, showing good resolution, can be obtained with the reconstruction methods when (a) the attenuation within the target is low, and (b) the speed of sound variation across boundaries is low. These sound images have subsequently been used to correct registration artifacts in the equivalent reflection UCT images of the same targets. These corrected reflection UCT images show much improved resolution, reduced speckle, and ease of interpretation when compared to conventional real-time pulse-echo ultrasound images.< >

关键词： Biomedical acoustics Image processing Tomography Biomedical computing

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real-time EXPERT system FOR IDENTIFYING ROTOR FAULTS AND MECHANICAL INFLUENCES IN INDUCTION-MOTOR PHASE CURRENT

REAL-TIME EXPERT SYSTEM FOR IDENTIFYING ROTOR FAULTS AND MEC...

引用

5TH INTERNATIONAL CONF ON ELECTRICAL MACHINES AND DEVICES

作者： LEITH, D RANKIN, D In-Spec Ltd United Kingdom

ISBN: (纸本)0852965206

The development of a knowledge-base system for distinguishing rotor faults and load influences in the stator current spectra of an induction motor is discussed. Failures in an induction motors which operate in hazardous or cost critical environments must be easily detected. methods have been developed to decect faults based on identifying sidebands around the fundamental frequency, in the phase current spectra, while the motor is operating normally. Data has been collected from 100 users of this rotor detection technique. The data was organized using ruled based techniques and making the information available in the form of expert system software for use in real time with data gathering equipment.

关键词： Expert systems

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The practical application of rule and knowledge based system techniques to industrial processes

The practical application of rule and knowledge based system...

引用

iee colloquium on Rule-Based systems for real-time Planning and Control

作者： J. Grist

This paper concerns the application of rule and knowledge based techniques to the control and optimisation of industrial processes. It is based on work initiated by Blue Circle plc for the optimisation of the control of cement kilns. This work has resulted in the development of a commercial product, known as LINKman, which has been installed successfully in twenty three plants worldwide where it achieves substantial savings in fuel and improvements in quality. This paper looks at the techniques and discusses some of the practical issues involved in their application.< >

关键词： Cement industry Knowledge based systems Process control

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