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Auflistung nach Autor:in "Seifert, Georg"

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  • Konferenzbeitrag
    Funktionale Sicherheit in Automotive und Avionik: Ein Staffellauf
    (Automotive - Safety & Security 2017 - Sicherheit und Zuverlässigkeit für automobile Informationstechnik, 2017) Schwierz, Andreas; Seifert, Georg; Hiergeist, Sebastian
    Der nachfolgende Bericht geht auf die gemeinsamen Interessen von sicherheitskritischen Systemen aus der Luftfahrt- und der Automobilbranche ein. Hierbei wird dargelegt, dass die Software- Funktionalität stark von der eingesetzten Hardware abhängig ist und Auswirkungen auf die gewünschte Sicherheit hat. In diesem Bereich können beide Branchen voneinander profitieren. Die Luftfahrt hat historisch gesehen schon früh angefangen, systematisch funktionale Sicherheit zu standardisieren, wohingegen die Automobilbranche seit 2011 nachzieht und mit ihrer großen Marktmacht auf die Hardwarehersteller einwirken kann. Hieraus könnte auch die Luftfahrtindustrie ihren Nutzen ziehen.
  • Konferenzbeitrag
    Mixed Reality Environment for Complex Scenario Testing
    (Mensch und Computer 2021 - Tagungsband, 2021) Funk Drechsler, Maikol; Reway, Fabio; Seifert, Georg; Huber, Werner; Riener, Andreas
    Driver assistance systems are currently evaluated using standardized test procedures as defined, for example, by Euro NCAP, but which only represent a narrow, idealized spectrum of real-life situations. Test conditions hardly take into account the variability that occur in everyday traffic – adverse weather conditions such as fog, rain, snow or darkness are typically not considered, nor are the resulting changes in, e.g., the behavior of pedestrians. In an emergency braking situation, the behavior of the VRU can also be directly affected by the interaction with the vehicle. For example, a pedestrian might be alarmed by an approaching car. This could elicit a very different response in the human that cannot be simulated in the dummy motion as defined in the standard test procedure. In order to create a more versatile and interactive simulation and test environment, we have developed the Mixed Reality Test Environment MiRE. The goal of Mixed Reality Test Environment MiRE is to enable testing of a broader range of scenarios, including interaction between VRUs and vehicles. During the demo, we will demonstrate MiRE live to interested visitors and show its full potential for future driving safety tests.
  • Konferenzbeitrag
    Static Analysis Methodologies for WCET Calculating with Asynchronous IO
    (Software Engineering 2022 Workshops, 2022) Seifert, Georg
    The estimation of the upper bound of the WCET is one of the hardest challenges in the analysis of safety critical real time applications. Since a long time, the static WCET estimation of single core CPU-focused systems without shared resources has been investigated and can now be regarded as solved. The WCET analysis with shared resources is not feasible with current practice due to the lack of information about the internal timing, especially the IO system. The rise of system functionality and the growth of interfaces with high bandwidth in MCUs has resulted in a situation where a CPU-only processing of the IO, or a degraded usage of DMACs, is no more feasible. Therefore, dedicated hardware components, like DMAC, have to be considered and the disadvantages of conflict-affl icted transfers must become part of the analysis. To resolve the problems with interference afflicted MCU internal data transfers, an approach is presented which describes the infl uence parameters on the WCET and expresses these in a simplified timing model of the MCU. Afterwards the information is used to extrapolate the increase of the execution time caused by a given type of traffic to estimate the WCET with asynchronous IO accesses.