By Carl Sandom, Derek Fowler (auth.), Felix Redmill, Tom Anderson (eds.)
Developments in Risk-based ways to Safety comprises the invited papers provided on the Fourteenth annual Safety-critical platforms Symposium, held at Bristol, united kingdom in February 2006.
The papers integrated during this quantity tackle the main severe themes within the box of safety-critical platforms. the focal point this yr, thought of from quite a few views, is on contemporary advancements in risk-based techniques. matters mentioned contain innovation in hazard research, administration hazard, the protection case, software program defense, language improvement and the construction of platforms for complicated keep an eye on functions.
Papers offer a mixture of business adventure and educational study effects and are provided lower than the headings: educational, New methods to possibility review, adventure of constructing protection situations, administration impression on security, software program protection, New applied sciences in Safety-critical platforms, including Dimensions to defense Cases.
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Additional resources for Developments in Risk-based Approaches to Safety: Proceedings of the Fourteenth Safety-critical Systems Symposium, Bristol, UK, 7–9 February 2006
1 Definition of System Boundary One of the first steps recommended in IEC 61508 is to determine the boundary of the Equipment Under Control (EUC) and the EUC control system. Since IEC 61508 is directed towards programmable electronics systems, it is natural to think of the road and its users as the EUC and the ITS as the control system. g. at the level of errors in the display of signs and signals. It rapidly became evident that this model would not suffice and that a much broader definition of the system boundary was necessary.
In order to avoid opening the hard shoulder when a parked vehicle or some other obstruction is present, the hard shoulder will be opened a section at a time, starting at the exit and working in an upstream direction. A section is the distance between two sets of overhead signals, which is nominally 500m. Before opening each section, the operator will automatically be presented with a sequence of images from the fixed cameras, and required to confirm that the section is clear. If a parked vehicle or other obstacle is encountered or there is an equipment failure, the process pauses with only the sections downstream of the obstruction opened.
By examining the spreadsheet comparisons, it becomes very clear which hazards have the most significant impact on the comparison. The GALE argument is then presented in the following format: 1. ATM reduces the risk of a number of normal motorway hazards. A list of the hazards that have the most significant effect on the GALE comparison is provided, together with the reasons why ATM reduces the risk. 2. ATM introduces a number of new hazards to the operation of the motorway. However, various mitigating measures are being adopted to reduce the risk of these hazards.