Andreas Pfitzmann (auth.), Maritta Heisel, Peter's Computer Safety, Reliability, and Security: 23rd PDF

By Andreas Pfitzmann (auth.), Maritta Heisel, Peter Liggesmeyer, Stefan Wittmann (eds.)

ISBN-10: 3540231765

ISBN-13: 9783540231769

Theimportanceofsafetyandsecurityisgrowingsteadily.Safetyisaqualityc- racteristic that routinely has been thought of to be vital in embedded structures, and defense is generally an important estate in enterprise functions. there's definitely an inclination to exploit software-based ideas in safety-critical functions domain names, which raises the significance of security engineering te- niques. those comprise modelling and research suggestions in addition to acceptable techniques and instruments. And it truly is absolutely right that the volume of con?dential info that require security from unauthorized entry is turning out to be. consequently, safeguard is essential. at the one hand, the conventional motivations for addressing security and safety nonetheless exist, and their relevance has more advantageous. nonetheless, security and safety specifications ensue more and more within the similar approach. at this time, many software-based platforms engage with technical apparatus and so they converse, e.g., with clients and different structures. destiny structures will increasingly more engage with many different entities (technical platforms, humans, the en- ronment). during this state of affairs, safeguard difficulties could cause safety-related disasters. it's therefore essential to deal with security and safety. it really is additionally required take into consideration the interactions among those properties.

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Extra info for Computer Safety, Reliability, and Security: 23rd International Conference, SAFECOMP 2004, Potsdam, Germany, September 21-24, 2004. Proceedings

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9, pp. 1270–1282 (1991). 3. , Grumberg, O. : Model Checking, MIT Press (1999). 4. : Formalising Railway Interlocking Requirements, Technical report 1997:3, Swedish National Rail Administration (1997) 5. : Formal Verification of Railway Interlockings, Technical report 1997:4, Swedish National Rail Administration (1997) 6. : Specifying Railway Interlocking Requirements for Practical Use, In Schoitsch, E. ): Proceedings of the 15th International Conference on Computer Safety, Reliability and Security (SAFECOMP’96), Springer-Verlag (1996) 7.

This learning law (12) moves the FSOM output y * closer to the training data output y by increasing or decreasing the influence of the runner-up rule and is described as follows: • • The influence of the runner-up rule is increased by moving runner-up spread edge towards the centre of the winner rule. The influence of the runner-up rule is decreased by moving runner-up spread edge away from the winner rule centre and towards sw ,k . sr ,k ( t + 1 ) = sr ,k ( t ) + gU ,r ( t )[ cw ,k ( t ) − sr ,k ( t ) ], sgn ( y − y * ) = sgn ( yr − yw ), sr ,k ( t + 1 ) = sr ,k ( t ) + gU ,r ( t )[ sw ,k ( t ) − sr ,k ( t ) ], otherwise (12) Where the learning coefficient of the fuzzy sets U r , j is defined as gU ,r .

This set of formulae was then used as input to the theorem prover. 3) considered safety-critical and therefore was not formally verified. 4 Counter-Model Analysis More often than not, a proof fails because the system does not quite follow the specification. The theorem prover algorithm will then automatically generate a “counter-model”, a description of a situation where the system exhibits a behaviour which is not allowed by the specification. The counter-model itself is of limited use partly because of its excruciating detail but also because it does not in itself explain the reason for the incorrect behaviour.

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Computer Safety, Reliability, and Security: 23rd International Conference, SAFECOMP 2004, Potsdam, Germany, September 21-24, 2004. Proceedings by Andreas Pfitzmann (auth.), Maritta Heisel, Peter Liggesmeyer, Stefan Wittmann (eds.)


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