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Computer-Aided Engineering Journal

Issue 2 • Date Apr 1991

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Displaying Results 1 - 4 of 4
  • Structured knowledge engineering: a Yourdon-based approach to the analysis and design of KBS

    Page(s): 61 - 68
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    The tasks of analysing and designing knowledge-based systems (KBS) are put into a structured framework. In order to do this, a structured lifecycle for knowledge-based systems is introduced, as well as some tools that allow both the taking of a structured approach and the production of appropriate structured models of the knowledge domain. The authors look first at the process of KBS design to compare and contrast one of the most commonly used design methods, i.e. prototyping, with a structured design method. Making use of terminology introduced by Yourdon (1989) to characterise system projects, the author shows how the adoption of the more formal structured approach need not lead to any loss of the `freshness' that is claimed as the characteristic of a prototyping approach. The various stages of analysis and design are analysed in order to introduce the tools needed to construct the structured models of the knowledge-based system. A very simple example is used to illustrate the ideas expressed View full abstract»

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  • The application of a biarc technique in CNC machining

    Page(s): 54 - 60
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    It is frequently necessary to machine a contour which has been defined by discreet co-ordinate information. Traditionally, this had been achieved by contour-fitting procedures such as mathematical, parametric or B-splines. A technique has been established for fitting circular arcs to such data to give smooth curves. This article describes how that technique may be used on a PC to generate numerical control (NC) data. A successful machining exercise is detailed View full abstract»

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  • CASNS- a heuristic algorithm for the nesting of irregular-shaped sheet-metal blanks

    Page(s): 69 - 73
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    Reports on the design and implementation of a computer-aided sheet nesting system (CASNS) for the nesting of two-dimensional irregular-shaped sheet-metal blanks on a given sheet stock or coil stock. The system is designed by considering several constraints of sheet-metal stamping operations, such as bridge width and grain orientation, and design requirements such as maximising the strength of the part when subsequent bending is involved, minimisation of scrap, and economic justification for a single or multiple station operation. Through many practical case studies, the system proves its efficiency, effectiveness and usefulness View full abstract»

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  • A smalltalk/V VLSI CAD application

    Page(s): 47 - 53
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (672 KB)  

    The purpose of the work described was to explore the utility of the Smalltalk/V object-oriented language in prototyping an application that would form just one module of a potentially much more extensive and complex system, a complete VLSI design system. The author also wanted to investigate issues arising from the fact that the application itself and the development methodology would have to anticipate the integration of a series of processes that would extend both up- and downstream; for example, logical and functional design stages, circuit synthesis and testing etc. Others have applied OOP to logic circuit design and to logic simulation. Here OOP is applied to the physical layout of the mask-level geometrical entities that go to make up the silicon realisation of an IC design View full abstract»

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