By Alan T. Murray
This textual content brings jointly differing geographic views in modeling and research so one can spotlight infrastructure weaknesses or plan for his or her defense. foreign students, from quite a few disciplines--geography, local technology, making plans, public coverage, operations study, arithmetic, laptop technological know-how, engineering and transportation--offer various views in this topic. this article is a vital contribution providing synthesis and new methodological techniques. It explores the capability results of serious infrastructure failure, stemming from either man-made and traditional mess ups. The ways hired are wide-ranging, together with geographic, monetary and social views on severe infrastructure issues.
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Additional info for Critical Infrastructure: Reliability and Vulnerability
Likewise, the Ipswich Motorway has a 100 per cent effect on the accessibility of Brisbane (in the NHS, see above) and a 21 per cent decrease in accessibility overall. These individual changes as well as the overall change help to more clearly define the vulnerability of specific road sections, whereas these results are not available for the generalised cost index. 5 identifies these critical road sections on a map of the NHS network. Ipswich Motorway Hume Highway Hume Freeway Hume Freeway Fig. 5, the overall accessibility of all of the capital cities decreases by 34 per cent with a cut to the Sydney-Yass Section of the Hume Freeway.
The Hansen index for the degraded network divided by the relevant Hansen index for the full network. The same four road sections were identified as critical (most vulnerable) parts of the network, in terms of the reduced levels of overall accessibility (between all cities) for the NHS network. 5). It should be noted that the overall effect of the Ipswich Motorway is due to the peculiar topology of the NHS network and the simplification of any analysis of the road system based on this network alone.
Consequently, it is assumed that the defender’s payoff is the negative value of the attacker’s payoff. The situation where the attacker tries to maximize and the defender tries to minimize the total expected damage can, thus, be translated into an optimization problem. The game theory model has deliberately been kept simple, and it is assumed that both players have perfect information about the system, and the resources and preferences of the other. In a simple numerical example (using a stylized version of the national Swedish transmission network) the performance of different defense strategies against a number of attack scenarios is studied.