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Advances in Optimisation, IEE Colloquium on

Date 20 Mar 1989

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Displaying Results 1 - 7 of 7
  • Heuristics for project expedition

    Publication Year: 1989 , Page(s): 7/1 - 7/6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (268 KB)  

    A prototype system which allows a project network to be portrayed graphically as a CPA network on a high-resolution workstation. Initially, the project network is described, the system calculates the natural completion date of the project from standard CPA calculations. The user is then able to specify a target completion date. An algorithm then examines the network to identify all the activities which, if expedited, could reduce the project duration, these are the initial set of activities to consider for expedition. A knowledge based system then postulates an expedition strategy for each of these activities, this is performed by a detailed analysis of much project data. From each selected strategy the knowledge based system goes on to estimate the resultant time-cost trade-off function. It is from this point that a heuristic algorithm can be invoked, the degree of influence of the various heuristics can be set beforehand View full abstract»

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  • Optimising PSS using learning automata

    Publication Year: 1989 , Page(s): 3/1 - 3/3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (124 KB)  

    Stochastic learning automata have been applied to a wide range of problems including image compression, relaxation labelling, real-time process control, multiprocessor scheduling and communications network routing and flow control. As with the present state of the art in neural networks there have been no shortage of potential applications buy many suggestions have been ill-conceived. The author specifies the criteria which should be satisfied to provide a worthwhile learning automata control application. They are as follows: the system must be sufficiently complex and involve large operational uncertainties so that no good dynamic model exists; the system must be amenable to decentralised control. At each location where control can be exercised the number of choices must be limited; and feedback to every decentralised controller must be provided by some random realisation of a global performance criterion. The only application which so far satisfies the above criteria and shows significant promise is the use of learning automata for the adaptive control of routing information in circuit switched and packet-switched communication networks. In the paper the author concentrates on variable structure automata, convergence characteristics, and adaptive optimisation View full abstract»

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  • Improving object-oriented software design

    Publication Year: 1989 , Page(s): 2/1 - 2/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (164 KB)  

    To take a slightly simplified view, an object in a program is a variable that can be manipulated only by a prescribed set of procedures. Programs written in almost all programming languages can be designed around the notion of objects. Software engineers are interested in two questions about objects: which objects should be used in the construction of a given program; and what general principles can guide the search for objects? The paper looks at the second of these equations, concentrating on object-oriented designs targeted to programming languages such as Ada (ANSI 1983) and modular-2 (Wirth 1985). Typically, object-oriented design begins by identifying a set of objects, perhaps by looking for nouns within the problem statement, and proceeds by identifying procedures for manipulating those objects, perhaps by looking for verbs in the problem statement. An adequate design is one that contains all the data structures and algorithms needed to solve the problem, parcelled up into procedures and modules of comprehensible size View full abstract»

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  • Crossing the divide [corporate and manufacturing decision processes]

    Publication Year: 1989 , Page(s): 5/1 - 5/5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (236 KB)  

    The decline of the UK's competitive position has been there for all to see. The cut and thrust and struggle for companies to survive has become a way of life. To close down a plant, once an anathema to business, has now become an acceptable course of action to follow based upon some corporate strategic decision. There is a lack of understanding and empathy by top management towards manufacturing and investment in the new plant. There are three things a company must do to compete effectively. They are to: provide an efficient well automated manufacturing system which will give the business a distinct advantage over competitors; provide a co-ordinated method of determining the ways in which products win orders; and control the process in such a way that the product meets the order winning criteria and maximises profit View full abstract»

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  • IEE Colloquium on `Advances in Optimisation' (Digest No.45)

    Publication Year: 1989
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (20 KB)  

    The following topics were dealt with: control system design; object-oriented software design; PSS optimisation; intelligent automation tools; and heuristics for project expedition View full abstract»

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  • Control system design via multiobjective optimization

    Publication Year: 1989 , Page(s): 1/1 - 1/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    Higher performance requirements and increasing system complexity lead to an increasing requirement for the use of optimization methods in control system design. Their use ranges from the fine tuning of parameters to the minimization of specific criteria. A common criticism of optimization methods, such as the LQG and H-infinity approaches in control system design, is that the objectives do not adequately represent true design requirements. Further, controllers arising from such methods are not always practically realizable and do not easily relate to the physical plant. At present, control engineers who wish to address more specific optimization problems, which use more meaningful objectives and result in practical controllers, must develop special-purpose software. The authors describe the development of an environment which attempts to provide a framework for the flexible and interactive formulation of optimization problems. In particular, they feel that the expression of the problem as a multiobjective one closely matches the control designer's requirements View full abstract»

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  • Tools for intelligent automation

    Publication Year: 1989 , Page(s): 6/1 - 6/3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    Outlines the motivation, developments and achievements within ESPRIT project p820: Design and Experimentation of a Real-Time Knowledge Based System Toolkit for Process Control Applications. The project has developed a kernel of the toolkit, now called the QUIC Toolkit (QUalitative Industrial Control) and is being validated on three important demonstrator applications relevant to industrial control and diagnosis problems. Within the QUIC Toolkit architecture five conceptual abstractions or layers have been defined: strategic, tactical, teleological, functional and object, each providing a set of primitives consistent with the given architectural properties View full abstract»

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