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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 17 (1989), S. 163-180 
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract A class of machining and assembly systems characterised by a flat assembly component structure, the existence of families of similar items, non-negligible setups and fast material flow between work-centres is considered. A hierarchical production scheduling framework is proposed for this class of systems. The decision problems at each level of the hierarchy are identified and formulated. The formulations constitute a sufficiently accurate reflection of reality, while at the same time leading to tractable mathematical models that can be handled by carefully chosen and adapted optimisation techniques. The models can, when combined with suitable knowledge bases form the core of an effective multi-pass, hierarchical decision support system. Possible srategies for coordinating the various decision problems at the different levels of the hierarchy are also discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 11 (1977), S. 963-973 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A measure of the severity of a pipeline failure is the minimum reduction in load in the network necessary to ensure that no node falls below its minimum pressure. The expected loss of sales is calculated as the product of the minimum reduction in load and the expected duration of the period during which the pipeline will be in the inoperable state, and thus reflects both the severity and the frequency of the failure. Consequently, this index, whose evaluation involves network theory, optimization and probability theory, serves as a measure of the insecurity of the gas network.The security index can be evaluated for all points within a system, providing a basis of comparison between the relative vulnerability of different parts. The relative level of security of different design proposals can also be assessed using this index.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 12 (1978), S. 837-851 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Varied problems in the fields of operation, scheduling, allocation and design in power systems analysis can be formulated as fixed cost trans-shipment problems. This paper indicates possible areas of application of such formulations, and by exploiting specific characteristics of certain power systems problems presents an efficient branch and bound method for solving them.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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