4 papers
Statistical Assessment of Safety Levels of Railway Operators
Jens Braband, Hendrik Schäbe
Recently the European Union Agency for Railways (ERA) has received a mandate for 'the development of common safety methods for assessing the safety level and the safety performance…
Application of the Cox Regression Model for Analysis of Railway Safety Performance
Hendrik Schäbe, Jens Braband
The assessment of in-service safety performance is an important task, not only in railways. For example it is important to identify deviations early, in particular possible deterio…
Why 2 times 2 ain't necessarily 4 - at least not in IT security risk assessment
Jens Braband
Recently, a novel approach towards semi-quantitative IT security risk assessment has been proposed in the draft IEC 62443-3-2. This approach is analyzed from several different angl…
Propagation of Uncertainty in Risk Analysis and Safety Integrity Level Composition
Jens Braband, Hendrik Schäbe
In many risk analyses the results are only given as mean values and often the input data are also mean values. However the required accuracy of the result is often an interval of v…