TY - CHAP A1 - Renner, Sebastian A1 - Pozzobon, Enrico A1 - Mottok, Jürgen ED - Meng, Weizhi T1 - A Hardware in the Loop Benchmark Suite to Evaluate NIST LWC Ciphers on Microcontrollers T2 - Information and Communications Security: 22nd International Conference, ICICS 2020, Copenhagen, Denmark, August 24-26, 2020, Proceedings N2 - The National Institute of Standards and Technology (NIST) started the standardization process for lightweight cryptography algorithms in 2018. By the end of the first round, 32 submissions have been selected as 2nd round candidates. NIST allowed designers of 2nd round submissions to provide small updates on both their specifications and implementation packages. In this work, we introduce a benchmarking framework for evaluating the performance of NIST Lightweight Cryptography (LWC) candidates on embedded platforms. We show the features and application of the framework and explain its design rationale. Moreover, we provide information on how we aim to present up-to-date performance figures throughout the NIST LWC competition. In this paper, we present an excerpt of our software benchmarking results regarding speed and memory requirements of selected ciphers. All up-to-date results, including benchmarking different test cases for multiple variants of each 2nd round algorithm on five different microcontrollers, are periodically published to a public website. While initially only the reference implementations were available, the ability of automatically testing the performance of the candidate algorithms on multiple platforms becomes especially relevant as more optimized implementations are developed. Finally, we show how the framework can be extended in different directions: support for more target platforms can be easily added, different kinds of algorithms can be tested, and other test metrics can be acquired. The focus of this paper should rather lay on the framework design and testing methodology than on the current results, especially for reference code. KW - Lightweight cryptography KW - Benchmarking KW - Embedded systems KW - RISC-V Y1 - 2020 U6 - https://doi.org/10.1007/978-3-030-61078-4_28 SP - 495 EP - 509 PB - Springer CY - Cham ER - TY - CHAP A1 - Reuter, Rebecca A1 - Stark, Theresa A1 - Sedelmaier, Yvonne A1 - Landes, Dieter A1 - Mottok, Jürgen A1 - Wolff, Christian T1 - Insights in Students’ Problems during UML Modeling T2 - 2020 IEEE Global Engineering Education Conference (EDUCON): Proceedings N2 - UML (Unified Modeling Language) is the current de facto as well as de jure standard (ISO/IEC 19505:2012) notation to visualize models in software development. UML provides essential guidelines and rules to visualize and understand complex software systems. This is the reason why it has become part of curricula for software engineering courses at many universities worldwide. It is well known, however, that UML is hard to grasp for novices, mainly due to its complexity. In order to tackle the problem of teaching UML to novice students appropriately, it is inevitable to understand their needs and problems much better than we do now. This paper presents empirical insights into students' problems when developing common UML diagrams. Identified problems are generalized, giving rise to a problem catalogue that is derived from our empirical findings, thus establishing a basis for addressing these problems through focused learning arrangements. KW - UML KW - UML problems KW - software engineering KW - higher education KW - visual notation Y1 - 2020 U6 - https://doi.org/10.1109/EDUCON45650.2020.9125110 SP - 592 EP - 600 ER - TY - CHAP A1 - Gruber, Hans A1 - Wolff, Christian A1 - Mottok, Jürgen A1 - Bazo, Alexander A1 - Hauser, Florian A1 - Schreistetter, Stefan T1 - Tutorial on Software Engineering Education in Co-Located Multi-User Eye-Tracking-Environments T2 - Proceedings of the 32nd IEEE Conference on Software Engineering Education and Training: Munich, November 2020 N2 - We briefly describe a tutorial on the application of Eye-Tracking technology for Software Engineering Education. We will showcase our setup of a large-scale Eye-Tracking-Classroom and its usage for real-time improvement of traditional learning scenarios in Software Engineering Education. We will focus on the integration of gaze data into modern integrated development environments (IDEs) and demonstrate a complete workflow for its usage in co-located multi-user Eye-Tracking-Environments. KW - eye-tracking KW - software engineering education KW - multi-user eye tracking KW - real-time learning scenarios Y1 - 2020 U6 - https://doi.org/10.1109/CSEET49119.2020.9206170 ER - TY - CHAP A1 - Inderwies, Tom A1 - Mottok, Jürgen T1 - Secure Software Update of a Secure Module in the Power Grid T2 - Proceedings of the Regensburg Applied Research Conference 2020 (RARC 2020), July 31st Y1 - 2020 UR - https://doi.org/10.35096/othr/pub-641 SP - 25 EP - 31 ER - TY - CHAP A1 - Hauser, Florian A1 - Schreistetter, Stefan A1 - Reuter, Rebecca A1 - Mottok, Jürgen A1 - Gruber, Hans A1 - Holmqvist, Kenneth A1 - Schorr, Nick T1 - Code reviews in C++: Preliminary results from an eye tracking study T2 - ETRA '20 Short Papers: ACM Symposium on Eye Tracking Research and ApplicationsJune 2020 N2 - Code reviews are an essential part of quality assurance in modern software projects. But despite their great importance, they are still carried out in a way that relies on human skills and decisions. During the last decade, there have been several publications on code reviews using eye tracking as a method, but only a few studies have focused on the performance differences between experts and novices. To get a deeper understanding of these differences, the following experiment was developed: This study surveys expertise-related differences in experts’, advanced programmers’, and novices’ eye movements during the review of eight short C++ code examples, including correct and erroneous codes. A sample of 35 participants (21 novices, 14 advanced and expert programmers) were recruited. A Tobii Spectrum 600 was used for the data collection. Measures included participants’ eye movements during the code review, demographic background data, and cued retrospective verbal comments on replays of their own eye movement recordings. Preliminary results give proof for experience-related differences between participants. Advanced and expert programmers performed significantly better in case of error detection and the eye tracking data implies a more efficient reviewing strategy. Y1 - 2020 SN - ISBN 9781450371346 U6 - https://doi.org/10.1145/3379156.3391980 SP - 1 EP - 5 ER - TY - CHAP A1 - Hauser, Florian A1 - Stark, Theresa A1 - Mottok, Jürgen A1 - Gruber, Hans A1 - Reuter, Rebecca T1 - Deliberate Practice in Programming: How is it carried out by programmers? T2 - ECSEE '20: Proceedings of the 4th European Conference on Software Engineering Education, Seeon, Germany, June 2020 N2 - This work in progress study examines through which activities programmers perform deliberate practice to improve their own skills in coding and programming. For this reason, a qualitative questionnaire was developed and conducted with a sample of 22 participants. The results indicate that programmers perform formal and informal forms of training and learning. Typically, a classical programming training in the context of a university course or for work-related reasons is a first step in the acquisition of expertise. Building on these basic skills, non-formal and informal learning activities are carried out by the learners. Especially the social interaction and the collaborative work with other programmers is of great importance in this context. The activities mentioned by the test persons fulfil the characteristics of deliberate practice and will be examined more closely in a further study. Y1 - 2020 SN - ISBN 9781450377522 U6 - https://doi.org/10.1145/3396802.3396815 SP - 42 EP - 46 ER - TY - CHAP A1 - Schmid, Michael A1 - Fritz, Florian A1 - Mottok, Jürgen T1 - Parallel Programming in Real-Time Systems T2 - Architecture of computing systems - ARCS 2019, 32nd international conference, Copenhagen, Denmark, May 20-21, 2019, proceedings N2 - The enormous amounts of data modern real-time systems have to process lead to expensive, long-lasting calculations. In order to manage those computations in a timely manner, parallel task models have gained a lot of popularity lately. However, parallel programming can be very cumbersome and verbose. Other computationally intensive sectors have dealt with parallel computing for decades and have accumulated their experience in the development of parallel frameworks. Examples of well known parallel runtime systems are OpenMP, Intel Threading Building Blocks (TBB) and Microsoft Parallel Pattern Library (PPL). These runtime systems allow developers to enhance parallelism in their applications in a straightforward fashion. However, those parallel frameworks and the patternbased interfaces they provide might not be easily applicable in real-time systems. In this paper, we investigate the use of parallel programming frameworks in time-critical systems. On that account, we discuss considerations for the design of real-time applications that make use of such parallel runtime systems. Furthermore, we evaluate three library-based frameworks from different computing sectors, namely Intel Threading Building Blocks, Embedded Multicore Building Blocks (EMBB) and High Performance ParalleX (HPX), by conducting benchmarks of various parallel algorithms on an embedded multicore architecture. Y1 - 2019 UR - https://ieeexplore.ieee.org/abstract/document/8836206 PB - VDE-Verlag CY - Berlin ER - TY - CHAP A1 - Mottok, Jürgen A1 - Schiller, Frank A1 - Völkl, Thomas A1 - Zeitler, Thomas T1 - A concept for a safe realization of a state machine in embedded automotive applications T2 - Computer safety, reliability, and security, 26th International Conference, SAFECOMP 2007, Nuremberg, Germany, September 18-21, 2007; proceedings N2 - Currently, both fail safe and fail operational architectures are based on hardware redundancy in automotive embedded systems. In contrast to this approach, safety is either a result of diverse software channels or of one channel of specifically coded software within the framework of Safely Embedded Software. Product costs are reduced and flexibility is increased. The overall concept is inspired by the well-known Vital Coded Processor approach. Since Mealy state machines are frequently used in embedded automotive systems, application software with a general Mealy state machine is realized differently with Safely Embedded Software starting from the high level programming language C with corresponding measurements. KW - Safely KW - Embedded Software KW - Safe State Machine KW - Diverse Instructions KW - Safety Code Weaving KW - Safety Supervisor Y1 - 2007 U6 - https://doi.org/10.1007/978-3-540-75101-4_2 SP - 283 EP - 288 ER - TY - JOUR A1 - Hummel, M. A1 - Mottok, Jürgen A1 - Egen, R. A1 - Schiller, Frank A1 - Mattes, T. A1 - Blum, M. A1 - Druckstein, F. T1 - Generische Safety-Architektur für Kfz-Software JF - Spektrum, das Magazin der Hochschule Regensburg Y1 - 2007 CY - Regensburg ER - TY - JOUR A1 - Schiller, Frank A1 - Mottok, Jürgen A1 - Blum, M. A1 - Duckstein, F. A1 - Egen, R. A1 - Hummel, M. A1 - Mattes, T. T1 - Generische Safety-Architektur für KFZ-Software JF - Hanser automotive Y1 - 2006 SP - 52 EP - 54 ER - TY - CHAP A1 - Deubzer, Michael A1 - Mottok, Jürgen A1 - Flug, Christian A1 - Zeitler, Thomas T1 - Profiling Performance Analyse von Embedded Real-Time System Architekturen T2 - Embedded Software Engineering Kongress, Tagungsband ; 8. bis 10. Dezember 2008, Sindelfingen Y1 - 2008 SP - 155 EP - 167 ER - TY - JOUR A1 - Federrath, H. A1 - Mottok, Jürgen A1 - Plößl, K. A1 - Völkl, Thomas T1 - Automotive safety and security JF - Jahresrückblick 2007 des Bayerischen IT-Sicherheitsclusters Y1 - 2007 ER - TY - CHAP A1 - Schmidt, Peter A1 - Mottok, Jürgen T1 - "Werkstattbericht" Bioagile Softwareentwicklung T2 - Embedded Software Engineering Kongress, Tagungsband ; 8. bis 10. Dezember 2008, Sindelfingen Y1 - 2008 SP - 455 EP - 460 ER - TY - CHAP A1 - Mottok, Jürgen A1 - Schiller, Frank T1 - MISRA C++:2008 and safely embedded software – a safety framework for C++ T2 - Proceedings of the Automotive Safety & Security Conference Y1 - 2008 UR - http://docplayer.org/53952332-Misra-c-2008-safely-embedded-software-ses.html ER - TY - CHAP A1 - Schirdewahn, B. A1 - Mottok, Jürgen T1 - Implementierungslösungen für die Eigenentwicklung eines deterministischen, nicht preemptiven Echtzeit Betriebssystems zur Verwaltung eingebetteter Applikationen T2 - Embedded Software Engineering Kongress, Tagungsband ; 8. bis 10. Dezember 2008, Sindelfingen Y1 - 2008 SP - 141 EP - 147 ER - TY - JOUR A1 - Mottok, Jürgen T1 - Aktuelle Forschungsergebnisse aus dem "Laboratory for Safe and Secure Systems"(LaS3) JF - Jahresrückblick 2008 des Bayerischen IT-Sicherheitsclusters Y1 - 2008 SP - 13 EP - 15 ER - TY - CHAP A1 - Mottok, Jürgen A1 - Schiller, Frank T1 - Safely embedded software and MISRA C++: 2008 – a safety framework for c++ T2 - Proceedings of the SAFETY@SIEMENS Conference Y1 - 2008 ER - TY - CHAP A1 - Mottok, Jürgen T1 - Safely embedded software- a safety framework for c++ T2 - Proceedings of the 1st Embedded Software Engineering Conference, 8. bis 10. Dezember 2008, Sindelfingen Y1 - 2008 SP - 444 EP - 449 ER - TY - CHAP A1 - Deubzer, Michael A1 - Margull, Ulrich A1 - Mottok, Jürgen A1 - Niemetz, Michael A1 - Wirrer, Gerhard T1 - Partitionierungs-Scheduling von Automotive Restricted Tasksystemen auf Multiprozessorplattformen T2 - Proceedings of the 2nd Embedded Software Engineering Congress, 8. bis 10. Dezember 2009, Sindelfingen Y1 - 2009 SP - 536 EP - 542 ER - TY - CHAP A1 - Krämer, Stefan A1 - Mottok, Jürgen A1 - Meier, Hans T1 - Modifikation des Taskzustandsmodells des LLREF-Schedulers auf einem Dual-Core-Prozessor T2 - Proceedings of the 2nd Embedded Software Engineering Congress, 8. bis 10. Dezember 2009, Sindelfingen Y1 - 2009 SP - 628 EP - 636 ER - TY - CHAP A1 - Mottok, Jürgen A1 - Hagel, Georg A1 - Utesch, Matthias A1 - Waldherr, Franz T1 - Konstruktivistische Didaktik - ein Rezept für eine bessere Software Engineering Ausbildung? T2 - Proceedings of the 2nd Embedded Software Engineering Congress, 8. bis 10. Dezember 2009, Sindelfingen Y1 - 2009 SP - 601 EP - 610 ER - TY - CHAP A1 - Schmidt, Peter A1 - Mottok, Jürgen T1 - Memorandum der Bioagile Software- und Systementwicklung T2 - Proceedings of the 2nd Embedded Software Engineering Congress, 8. bis 10. Dezember 2009, Sindelfingen Y1 - 2009 SP - 487 EP - 497 ER - TY - CHAP A1 - Bärwald, Andreas A1 - Hauff, Harald A1 - Mottok, Jürgen T1 - Qualification and certification of development tools for safety-critical applications T2 - Proceedings of Dependability@SIEMENS Conference N2 - This paper presents an overview on qualification and certification of tools used in the phases of the safety lifecycle for safety-critical applications, either for development or for verification and validation. Software development tools are widely used in the development of safety-critical software systems. More verification and validation procedures will be automated by software tools to reduce time consuming manual testing. The impact of software tools on functional safety is discussed. Based on normative regulations like IEC 61508 and ISO DIS 26262 different approaches for tool qualification and certification are presented. Y1 - 2009 ER - TY - JOUR A1 - Hartig, Wolfgang A1 - Habermann, Albert A1 - Mottok, Jürgen T1 - Mehr Qualität durch modellbasiertes Testen JF - Elektronik automotive 3 Y1 - 2009 UR - https://www.elektroniknet.de/automotive/software-tools/mehr-qualitaet-durch-modellbasiertes-testen.1370.html SP - 32 EP - 35 ER - TY - CHAP A1 - Steindl, Michael A1 - Mottok, Jürgen A1 - Meier, Hans A1 - Schiller, Frank A1 - Früchtl, M. T1 - Diskussion des Einsatzes von Safely Embedded Software in FPGA-Architekturen T2 - Proceedings of the 2nd Embedded Software Engineering Congress, 8. bis 10. Dezember 2009, Sindelfingen Y1 - 2009 SP - 655 EP - 661 ER - TY - CHAP A1 - Studt, Reimer A1 - Mottok, Jürgen A1 - Utesch, Matthias A1 - Landes, Dieter T1 - Anwendung der Bloom´schen Taxonomie auf Lehrinhalte des Software-Engineerings T2 - Proceedings of the 2nd Embedded Software Engineering Congress, 8. bis 10. Dezember 2009, Sindelfingen Y1 - 2009 SP - 583 EP - 593 ER - TY - CHAP A1 - Krämer, Stefan A1 - Mottok, Jürgen A1 - Meier, Hans T1 - Modifikation des Taskzustandsmodells des LLREF-Schedulers auf einem Dual-Core-Prozess T2 - Proceedings of the 2nd Embedded Software Engineering Congress, 8. bis 10. Dezember 2009, Sindelfingen Y1 - 2009 SP - 628 EP - 636 ER - TY - CHAP A1 - Schorer, Michael A1 - Kuntz, Stefan A1 - Mottok, Jürgen T1 - Beschreibung eines kooperativen Tasksystems mit OSEK-konformen Scheduler durch Petri Netze T2 - Proceedings of the 2nd Embedded Software Engineering Congress, 8. bis 10. Dezember 2009, Sindelfingen Y1 - 2009 SP - 637 EP - 644 ER - TY - CHAP A1 - Stamatescu, G. A1 - Deubzer, Michael A1 - Mottok, Jürgen A1 - Popescu, Dan T1 - Migration overhead in multiprocessor scheduling T2 - Proceedings of the 2nd Embedded Software Engineering Congress, 8. bis 10. Dezember 2009, Sindelfingen Y1 - 2009 SP - 645 EP - 654 ER - TY - JOUR A1 - Hartig, Wolfgang A1 - Habermann, Albert A1 - Mottok, Jürgen T1 - Model-based testing for better quality JF - Vector, Technicle Article Y1 - 2009 ER - TY - JOUR A1 - Mottok, Jürgen T1 - Safely embedded software JF - Embedded Software Engineering Report Y1 - 2009 VL - 53 SP - 10 EP - 11 ER - TY - CHAP A1 - Steindl, Michael A1 - Mottok, Jürgen A1 - Meier, Hans A1 - Schiller, Frank A1 - Früchtl, M. T1 - Safeguarded Processing of Sensor Data T2 - IT-SecurityArea (IT-SA 2009) vom 13.-15. Oktober 2009, Nürnberg N2 - The spectrum of software tasks no longer includes only rare function controlling tasks for sensor actuator chains in reactive embedded systems. However, more and more responsible challenges like safety-critical scenarios are tackled. Therefore sensor data have to be safeguarded by several mechanism. An obvious and widely used approach is the use of two redundant hardware controllers, but this comes along with an additional cost, space and energy factor. Another way to fulfill certain safety properties is to implement a second diverse software channel in a single micro-controller architecture according the Safely Embedded Software (SES) approach. However, a lack of performance occurs by implementing this diverse channel for complex computations e.g. floating-point operations. This paper gives an approach for transferring the SES into a coprocessor and to migrate SES to a flexible and powerful FPGA architecture. KW - Safety embedded software KW - FPGA KW - Diverse instructions KW - Safety code weaving Y1 - 2009 UR - https://hal.archives-ouvertes.fr/hal-02268737 ER - TY - JOUR A1 - Deubzer, Michael A1 - Mottok, Jürgen A1 - Bärwald, Andreas T1 - Dependability-Betrachtung von Multicore-Scheduling JF - HANSER Automotive N2 - Der Embedded Markt stellt sich auf eine neue Herausforderung ein: denUmstieg von Singlecore- auf Multicore-Prozessorsysteme. Dabei soll dieUmsetzung der Norm ISO 26262 die Funktionale Sicherheit der elektri-schen und elektronischen Systeme im Kraftfahrzeug gewährleisten. In diesem Beitrag betrachten die Hochschule Regensburg und die TÜV SüdAutomotive GmbH das Scheduling eines Echtzeitsystems als ein sicher-heitsrelevantes Sub-System. Y1 - 2010 UR - https://res.cloudinary.com/sternwald-systems/raw/upload/v1/hugoprd/ARTIKEL_ATTACH/00207DD4_0669BA3F5B24/4b2124fb030a4d3d5a42a83aaec4bddadebe3077/AM_2010_11_Dependability-Betrachtung-von-Multicore-Scheduling.pdf IS - 11 SP - 24 EP - 27 ER - TY - CHAP A1 - Bierl, Rudolf A1 - Boehm, M. A1 - Fraunhoffer, Judith A1 - Gardeia, Armin A1 - Mottok, Jürgen A1 - Schneider, Ralph A1 - Streubel, J. T1 - “Regensburger Modell zu den P-Seminaren” – Ein Konzept zur Gestaltung der Schnittstelle Gymnasium – Hochschule und zur Praxis einer kooperativen Lehr-Lern-Didaktik für Informationstechnik T2 - 3rd Embedded Software Engineering Congress, 7. bis 9. Dezember, Sindelfingen Y1 - 2010 PB - Vogel Business Media CY - Würzburg ER - TY - CHAP A1 - Hagel, Georg A1 - Mottok, Jürgen A1 - Utesch, Matthias A1 - Landes, Dieter A1 - Studt, Reimer T1 - Software Engineering Lernen für die berufliche Praxis – Erfahrungen mit dem konstruktivistischen Methodenbaukasten T2 - Proceedings of the 3rd Embedded Software Engineering Congress, 7. bis 9. Dezember 2010, Sindelfingen Y1 - 2010 ER - TY - CHAP A1 - Braun, Jürgen A1 - Mottok, Jürgen A1 - Miedl, Christian A1 - Greyer, D. A1 - Minas, Mark T1 - Fail-Safe und Fault-Tolerant Mechanismen T2 - Proceedings of the 3rd Embedded Software Engineering Congress, 7. bis 9. Dezember 2010, Sindelfingen Y1 - 2010 SP - 378 EP - 386 ER - TY - CHAP A1 - Steindl, Michael A1 - Mottok, Jürgen A1 - Meier, Hans A1 - Schiller, Frank A1 - Früchtl, M. T1 - Migration of SES to FPGA Based Architectural Concepts T2 - Proceedings of the Workshop 'Safely embedded software' Y1 - 2009 ER - TY - JOUR A1 - Deubzer, Michael A1 - Mottok, Jürgen T1 - Dependability von Systemen mit dynamischen Multicore-Schedulingalgorithmen JF - safetronic Y1 - 2010 ER - TY - JOUR A1 - Raab, Peter A1 - Mottok, Jürgen A1 - Meier, Hans T1 - OSEK-RTOS für Jedermann (Teil 2) JF - Embedded Software Engineering Report Y1 - 2009 VL - 53 SP - 10 EP - 12 ER - TY - JOUR A1 - Raab, Peter A1 - Mottok, Jürgen A1 - Meier, Hans T1 - OSEK-RTOS für Jedermann (Teil 1) JF - Embedded Software Engineering Report Y1 - 2009 VL - 53 IS - September SP - 14 EP - 15 ER - TY - JOUR A1 - Deubzer, Michael A1 - Mottok, Jürgen A1 - Margull, Ulrich A1 - Niemetz, Michael A1 - Wirrer, Gerhard T1 - Efficient Scheduling of Reliable Automotive Multi-core Systems with PD² by Weakening ERfair Task System Requirements JF - Automotive Safety and Security N2 - Partly Proportionate fair (Partly-Pfair) scheduling, which allows task migration at runtime and assigns each task processing time with regard to its weight, makes it possible to build highly efficient embedded multi-core systems. Due to its non-work-conserving behavior, which might leave the CPU idle even when tasks are ready to execute, tasks finish only shortly before their deadlines are reached. Benefits are lower task jitter, but additional workload, e.g. through interrupts, can lead to deadline violations. In this paper we present a work-conserving extension of Partly-Pfair scheduling, called PERfair scheduling and the algorithm P-ERfair-PD2 which applies Pfair modifications used for Partly-Pfair on the concept of ERfairness and PD2 policies. With a simulation based schedulability examination we show for multiple time base (MTB) task sets that P-ERfair- PD2 has the same performance as Partly-Pfair-PD2. Additionally, we show that P-ERfair- PD2 has a much higher robustness against perturbations, and therefore it is well suited for embedded domains, especially for the Automotive domain. Y1 - 2010 UR - https://www.researchgate.net/publication/287883010_Efficient_scheduling_of_reliable_automotive_multi-core_systems_with_pd2_by_weakening_erfair_tasksystem_requirements SP - 53 EP - 67 ER - TY - JOUR A1 - Deubzer, Michael A1 - Schiller, Frank A1 - Mottok, Jürgen A1 - Niemetz, Michael A1 - Margull, Ulrich T1 - Effizientes Multicore-Scheduling in Eingebetteten Systemen – Teil 1: Algorithmen für zuverlässige Echtzeitsysteme JF - atp - Automatisierungstechnische Praxis N2 - Eingebettete Systeme unterliegen neben den funktionalen Anforderungen besonders nicht funktionalen Qualitätsanforderungen wie Effizienz, Zuverlässigkeit und Echtzeitfähigkeit. Mit steigendem Bedarf an Rechenkapazität können bisherige Konzepte zur Leistungssteigerung von Singlecore-Systemen jedoch nicht mehr eingesetzt werden – der Umstieg auf Multicore-Systeme wird erforderlich. Im ersten Teil dieser Arbeit werden eine mögliche Prozessorarchitektur für zukünftige Automotive Multicore-Systeme und die Abstraktion der Software für diese Systeme vorgestellt. Nach einer Klassifkation von Multicore-Scheduling-Algorithmen präsentieren wir exemplarisch einen Algorithmus mit statischer Taskallokation und einen Algorithmus mit dynamischer Taskallokation. Bei beiden Algorithmen handelt es sich um eine Überführung theoretisch behandelter Algorithmen auf Automotive Systeme. Y1 - 2010 UR - https://docplayer.org/4474533-Effizienter-einsatz-von-multicore-systemen.html IS - 9 SP - 60 EP - 67 ER - TY - CHAP A1 - Schorer, Michael A1 - Kuntz, Stefan A1 - Mottok, Jürgen T1 - Verification of Behavioral Compatibility in the Virtual Integration Methodology T2 - 8th IEEE Workshop on Intelligent Solutions in Embedded Systems,Heraklion, Greece, July 2010 N2 - The advantages of component-based systems include reuse of generic components as well as adaption through variants. However, they bare a high risk of containing incompatibilities between components, due to the lack of control over the integration-relevant aspects of their components. Current development processes are able to detect incompatibilities between components only at very late stages of system development. The Virtual Integration methodology is an approach to detect and to solve compatibility issues during early stages of system design. The methodology supports developers with a set of measures to reduce the risk of incompatibilities to a minimum at each abstraction layer of their system architecture. Realtime requirements of embedded systems make it necessary to support the methodology with a formal model, which can describe dynamic properties of these systems. In our approach, we use interface automata because they offer a lightweight formalism to describe the behavior of components and to verify their compatibility based on these descriptions. In a feasibility study we show, to which extend interface automata are adequate for the foresaid purpose in the automotive application field. Y1 - 2010 U6 - https://doi.org/10.1109/WISES.2010.5548424 SP - 35 EP - 42 ER - TY - JOUR A1 - Deubzer, Michael A1 - Schiller, Frank A1 - Mottok, Jürgen A1 - Niemetz, Michael A1 - Margull, Ulrich T1 - Effizientes Multicore-Scheduling in Eingebetteten Systemen – Teil 2: Ein simulationsbasierter Ansatz zum Vergleich von Scheduling-Algorithmen JF - atp - Automatisierungstechnische Praxis N2 - Eingebettete Systeme unterliegen neben den funktionalen Anforderungen besonders nichtfunktionalen Qualitätsanforderungen wie Effizienz, Zuverlässigkeit und Echtzeitfähigkeit. Mit steigendem Bedarf an Rechenkapazität können bisherige Konzepte zur Leistungssteigerung von Singlecore-Systemen jedoch nicht mehr eingesetzt werden - der Umstieg auf Multicore-Systeme wird erforderlich. Im zweiten Teil dieser Arbeit wird ein simulationsbasierter Ansatz zum Vergleich von Multicore-Scheduling-Algorithmen vorgestellt, mit dem Algorithmen für Multicore-Systeme mit voller Migration und dynamischer Task-Priorität untersucht werden. Wir erweitern diesen Ansatz um ein Verfahren zur Untersuchung einer Tasksetmenge mit stochastisch beschriebenen Eigenschaften und vergleichen ihn mit den im Teil 1 beschriebenen Algorithmen BinPacking-EDF und P-ERfair-PD² für eine Gruppe von Automotive Powertrain Systemen. Y1 - 2010 VL - 52 IS - 10 ER - TY - CHAP A1 - Deubzer, Michael A1 - Margull, Ulrich A1 - Mottok, Jürgen A1 - Niemetz, Michael A1 - Wirrer, Gerhard T1 - Partly Proportionate Fair Multiprocessor Scheduling of Heterogeneous Task Systems T2 - 5th Embedded Real Time Software and Systems Conference, May 2010 N2 - Proportionate fair (Pfair) scheduling, which allows task migration at runtime and assigns each task processing time with regard to its weight, is one of the most efficient group of SMP multiprocessor scheduling algorithms known up to now. Drawbacks are tight requirements to the task system, namely the restriction to periodic task systems with synchronized task activation, quantized task execution time, and implicit task deadline. Most likely, a typical embedded real-time system does not fulfill these requirements. In this paper we address violations of these requirements. For heterogeneous task systems, we define the multiple time base (MTB) task system, which is a less pessimistic model than sporadic task systems and is used for automotive systems. We apply the concept of Pfair scheduling to MTB task systems, called partly proportionate fair (Partly-Pfair) scheduling. The restrictions on MTB task systems required for Partly-Pfair ness are weaker than restrictions on periodic task systems required for Pfair ness. In a simulation based study we examined the performance of Partly-Pfair-PD and found it capable to schedule feasible MTB task sets causing a load of up to 100% of the system capacity. Y1 - 2010 ER - TY - CHAP A1 - Bärwald, Andreas A1 - Hauff, Harald A1 - Mottok, Jürgen T1 - Qualification and Certification of Development Tools for Safety-Critical Applications T2 - Automotive Safety & Security N2 - This paper presents an overview on qualification and certification of tools used in the phases of the safety lifecycle for safety-critical applications, either for development or for verification and validation. Software development tools are widely used in the development of safety-critical software systems. More verification and validation procedures will be automated by software tools to reduce time consuming manual testing. The impact of software tools on functional safety is discussed. Based on normative regulations like IEC 61508 and ISO DIS 26262 different approaches for tool qualification and certification are presented. Y1 - 2010 UR - https://www.researchgate.net/publication/289001902_Qualification_and_certification_of_development_tools_for_safety-critical_applications SP - 135 EP - 149 ER - TY - CHAP A1 - Steindl, Michael A1 - Mottok, Jürgen A1 - Meier, Hans T1 - SES-based Framework for Fault-tolerant Systems T2 - 8th IEEE Workshop on Intelligent Solutions in Embedded Systems, Heraklion, Greece, July 2010 N2 - Embedded real-time systems are often used in harsh environments, for example engine control systems in automotive vehicles. In such ECUs (Engine Control Unit) faults can lead to serious accidents. In this paper we propose a safety embedded architecture based on coded processing. This framework only needs two channels to provide fault tolerance and allows the detection and identification of permanent and transient faults. Once a fault is detected by an observer unit the SES guard makes it visible and initiates a suitable failure reaction. Y1 - 2010 U6 - https://doi.org/10.1109/WISES.2010.5548427 SP - 12 EP - 16 ER - TY - JOUR A1 - Bärwald, Andreas A1 - Hauff, Harald A1 - Mottok, Jürgen T1 - Certification of safety relevant systems – Benefits of using pre-certified components JF - Automotive Safety and Security Y1 - 2010 ER - TY - CHAP A1 - Stappert, Friedhelm A1 - Jonsson, Jan A1 - Mottok, Jürgen A1 - Johansson, Rolf T1 - A Design Framework for End-to-End Timing Constrained Automotive T2 - 5th Embedded Real Time Software and Systems Conference (ERTS2 2010), May 2010, Toulouse, France Y1 - 2010 UR - https://hal.archives-ouvertes.fr/hal-02264378 ER - TY - CHAP A1 - Krämer, Stefan A1 - Mottok, Jürgen A1 - Meier, Hans T1 - Osek-basierende Implementierung des LLREF-Scheduling-Algorithmus für eine Dual-Core-Architektur T2 - 2. Landshuter Symposium Mikrosystemtechnik, Tagungsband, 24. une 25. Februar 2010, Hochschule Landshut Y1 - 2010 SP - 343 EP - 349 ER -