Download CoSMoS 2008: Complex Systems Modelling and Simulation by Susan Stepney, Fiona Polack, Peter Welch PDF

By Susan Stepney, Fiona Polack, Peter Welch

The research of complicated structures is starting to be speedily, and modelling and simulation instruments are an incredible a part of the method. This quantity brings jointly paintings from a multidisciplinary workforce of scientists, from biology and machine technological know-how, who're learning numerous suggestions and functions for modelling and simulating complicated platforms. a standard subject matter rising from a lot of this paintings is an emphasis on validation: how you can have faith laptop simulation is asserting whatever good concerning the advanced real-world area of curiosity.

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The identification of the group is primarily depended on the animal’s preference to be part of the herd (HBV). The HBV is used to determine a set of animals which form the core of the herd. Once the core group is identified all neighbouring animals in the area are added to form a group which will be evaluated in the next phase. – Once the groups potentially forming herds are identified, the reasoning process continues with the evaluation of the group coherence. This is in fact the top-down reasoning phase which is depicted by steps 4 and 5 in figure 5.

Conservatism will be a major obstacle to the creation of safety-critical complex systems. This will be both in its intuitive, “gut-feeling” form (complex systems are strange architectures implemented using strange algorithms on strange substrates) and in its well-reasoned form (if we can’t predict the worst case behaviour of a particular emergent algo- Engineering Safety-Critical Complex Systems 41 rithm, then we may be forced to eschew it in favour of a conventional, centralised algorithm that we can understand – even if the average performance is much worse).

There are several ways to structure and express a safety case. A plain natural language presentation can be used, or a tabular format, although there is increasing use of explicit argument structure notations such as the Goal Structuring Notation (GSN) (see Kelly in [11]). Below the level of notation, a safety case must be organised in some systematic way so that the completeness and adequacy of the argument can be assessed. Several different safety argument patterns are presented in [11]. Perhaps the simplest structure is a breakdown by identified hazards – such a case would argue that all hazards had been identified, that all hazards had been adequately mitigated, and that the combined risk from all mitigated hazards was acceptable.

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