Computing & Control Engineering Journal
Volume 5, Issue 1, February 1994
Volumes & issues:
Volume 5, Issue 1
February 1994
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- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, page: 2 –2
- DOI: 10.1049/cce:19940107
- Type: Article
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- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, page: 3 –3
- DOI: 10.1049/cce:19940108
- Type: Article
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- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, page: 5 –5
- DOI: 10.1049/cce:19940109
- Type: Article
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- Author(s): J. Brazendale and R. Bell
- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, p. 6 –12
- DOI: 10.1049/cce:19940101
- Type: Article
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This article provides an overview of the current working version of the proposed international standard on the functional safety of safety-related systems being developed by the International Electrotechnical Commission (IEC). The article also provides information on a number of other topics of current interest on safety-related systems. The Appendix gives an overview of risk and safety integrity concepts. - Author(s): D. Davis
- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, p. 13 –17
- DOI: 10.1049/cce:19940102
- Type: Article
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Where does the responsibility `buck' stop if a piece of software in a critical application fails? This article examines the range of liabilities placed on manufacturers and suppliers of safety-critical computer systems. - Author(s): J.A. Clark ; J.A. McDermid ; A. Burns
- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, p. 18 –23
- DOI: 10.1049/cce:19940103
- Type: Article
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Computers are being used increasingly in systems where the cost of error or failure might be extremely high. Some systems depend upon computers to maintain safety or contribute to the maintenance of safety. In other systems, incorrect operation may pose a threat to security, e.g. compromising the confidentiality and integrity of certain military information. Costs of failure may simply be financial, e.g. the unavailability of automated share dealing systems or banking systems. It is becoming increasingly common to talk about enterprise critical systems whose failure could result in severe harm, e.g. bankruptcy, to an enterprise or organisation. The criticality of such systems means that all practical measures should be taken to ensure that the associated risks are tolerable. This implies (inter alia) that such systems (including the software components thereof) must be subject to extensive analysis and testing before they are deployed. In many cases there is a formal clearance or certification process prior to deployment. - Source: Computing & Control Engineering Journal, Volume 5, Issue 1, page: 23 –23
- DOI: 10.1049/cce:19940110
- Type: Article
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- Author(s): W.J. Cullyer
- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, p. 25 –32
- DOI: 10.1049/cce:19940104
- Type: Article
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At present, design teams which need to produce animated specifications of control systems have to write their models from scratch. Usually this is done in an ad hoc manner, rather than exploiting generic results from computer science. This article proposes a formal model, for use in practical projects, based on extensions to the `Parnas (A7) dataflow model' of computation. The model is described using Ada generic packages, which need instantiation for the project in hand. An example of automotive throttle control is used to illustrate the method. - Author(s): S. Ablameyko ; B. Beregov ; A. Kryuchkov
- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, p. 33 –39
- DOI: 10.1049/cce:19940105
- Type: Article
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Discusses problems in automatic map digitising. The authors' experience and a PC-based cartographical system to digitise Russian and Belarussian national maps are presented. Memory restrictions made us develop special technologies and techniques to digitise large-size map drawings. The combination of manual digitising and labelling with automatic vectorisation and recognition, and interactive editing produced satisfactory time characteristics for digitising complex maps. To process scanned maps automatically with restricted computer memory, an effective pipeline oriented scheme and new techniques have been developed. A new process called object labelling has been introduced to speed up the interpretation process. A structure for the output database has been suggested to store all the required information about a map. The suggested technology allows a reduction in digitising time by more than a factor two in comparison with the existing manual map digitising methods. The system can be used to input and vectorise other different types of 2D line drawings. - Source: Computing & Control Engineering Journal, Volume 5, Issue 1, page: 40 –40
- DOI: 10.1049/cce:19940111
- Type: Article
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- Author(s): B. Shirinzadeh
- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, p. 41 –46
- DOI: 10.1049/cce:19940106
- Type: Article
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Fixturing is an important requirement for many manufacturing and assembly operations. If flexible manufacturing and assembly systems (FMS and FAS) are to be truly flexible, then the fixturing must also be flexible. This article presents a system for computer-aided design and analysis of reconfigurable fixtures in robotic assembly. The fixturing system employs a number of adjustable fixture modules that are set up, adjusted and changed automatically by the assembly robot without human intervention. The design of the fixture layout is performed interactively on a commercially available computer-aided design (CAD) package. The development of a dedicated software program to perform kinematic analysis of the fixture layout, using the information retrieved from the CAD database, is presented. A strategy to build various fixture layouts to locate and hold workpieces of various shapes and sizes using the same set of fixture modules is also presented. - Source: Computing & Control Engineering Journal, Volume 5, Issue 1, page: 47 –47
- DOI: 10.1049/cce:19940112
- Type: Article
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- Source: Computing & Control Engineering Journal, Volume 5, Issue 1, p. 47 –48
- DOI: 10.1049/cce:19940113
- Type: Article
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Control '94. Eat, drink and be merry... and learn how to control intelligently
Letter from the IEE President
Introduction: Safety-critical systems
Safety-related control and protection systems: standards update
Safety-critical systems - legal liability
Analysing high-integrity systems
Book reviews
An Ada model for the specification of control systems
Automatic map digitising: problems and solution
Contracts & orders
CAD-based design and analysis system for reconfigurable fixtures in robotic assembly
Information technology - a key technology for wealth creation
Calendar
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