Algorithms and Data Structures: Workshop WADS '89 Ottawa, by Ricardo A. Baeza-Yates, Gaston H. Gonnet (auth.), F. Dehne,

By Ricardo A. Baeza-Yates, Gaston H. Gonnet (auth.), F. Dehne, J. -R. Sack, N. Santoro (eds.)

This ebook includes the papers provided on the 1989 Workshop on Algorithms and knowledge constructions, which succeeds the 1988 Scandinavian Workshop on set of rules idea. It offers present study in a number of components of algorithms, computational geometry, geometric looking out, VLSI placement and routing, graph algorithms, parallel algorithms, allotted algorithms, databases, and textual content searching.

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Felici, K. Kanoun, A. ): SAFECOMP’99, LNCS 1698, pp. 27-38, 1999 © Springer-Verlag Berlin Heidelberg 1999 28 Y. Deswarte et al. 50129 [4]), nuclear power (IEC 60880 [5]), avionics (ARP 4754 [6] and DO 178B [7] standards), etc. These different standards share many common characteristics, which shows the need for a generic evaluation approach, such as the one considered in the IEC 61508 standard [8]. In the same way, when considering computing system security, there are evaluation criteria such as the TCSEC [9], ITSEC [10] or Common Criteria [11] that can help to assess the system ability to face possible threats.

The safety case will have been produced initially to present a valid safety argument with respect to the regulations, evidence and contextual information appropriate at the time. The difficulty in safety case maintenance is that any or all of these three elements may change over time. For example: • • An additional regulatory requirement may be added following an operational incident. An example of this from the civil aerospace domain would be the addition of a regulation regarding inadvertent thrust reverser deployment [4] following the Lauda Air thrust reverser deployment in flight accident.

Insufficient information recorded to support the change process The previous problems have addressed the quality of the information recorded in the safety case. However, there is also a problem concerning the quantity of information recorded. If information (such as the assumptions and context surrounding safety claims) simply isn’t recorded in the safety case then recognition of the impact of any changes requires a significant amount of detective work! Together these problems result in an informal and often subjective change management process where even a basic level of repeatable and systematic impact analysis cannot be guaranteed.

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