@inproceedings{GschossmannJobstMottoketal., author = {Gschossmann, Andreas and Jobst, Simon and Mottok, J{\"u}rgen and Bierl, Rudolf}, title = {A Measure of Confidence of Artificial Neural Network Classifiers}, series = {ARCS Workshop 2019; 32nd International Conference on Architecture of Computing Systems, 20-21 May 2019, Copenhagen, Denmark}, booktitle = {ARCS Workshop 2019; 32nd International Conference on Architecture of Computing Systems, 20-21 May 2019, Copenhagen, Denmark}, publisher = {VDE-Verlag}, address = {Berlin}, pages = {153 -- 157}, abstract = {Confidence in results of an Artificial Neural Networks (ANNs) is increased by preferring to reject data, that is not trustful, instead of risking a misclassification. For this purpose a model is proposed that is able to recognize data, which differs significantly from the training data, during inference. The proposed model observes all activations of the hidden layers, as well as input and output layers of an ANN in a grey-box view. To make ANNs more robust in safety critical applications, this model can be used to reject flawed data, that is suspected to decrease the accuracy of the model. If this information is logged during inference, it can be used to improve the model, by training it specifically with the missing information. An experiment on the MNIST dataset is conducted and its results are discussed.}, language = {en} } @inproceedings{SchmidhuberDeubzerMaderetal., author = {Schmidhuber, Stefan and Deubzer, Michael and Mader, Ralph and Niemetz, Michael and Mottok, J{\"u}rgen}, title = {Towards the Derivation of Guidelines for the Deployment of Real-Time Tasks on a Multicore Processor}, series = {4th International Symposium on Model-Based Safety and Assessment (IMBSA 2014), Munich, Germany, October 27-29, 2014, Proceedings}, booktitle = {4th International Symposium on Model-Based Safety and Assessment (IMBSA 2014), Munich, Germany, October 27-29, 2014, Proceedings}, publisher = {Springer}, address = {Munich}, isbn = {978-3-319-12213-7}, doi = {10.1007/978-3-319-12214-4_12}, pages = {152 -- 165}, abstract = {The deployment of automotive software on a multicore processor includes the task of mapping executables to cores. Given the number of possible solutions, integrators have to solve a complex problem. Considering multiple, often conflicting goals like minimizing task response times and memory consumption, complexity further increased with the advent of multicore processors. We present a model-based approach for deriving design rules supporting integrators with statically mapping tasks to a multicore ECU. First, an evolutionary algorithm is used to sample the design space. For each sample, a model-based analysis is performed, resulting in the required fitness values according to the system metric objectives. Finally, subsets of the sample population are used to derive deployment guidelines by evaluating similarities between highly ranked solutions. This reduces the number of solutions to be considered by the integrators by orders of magnitude. In a case-study, we demonstrate the developed approach on an artificial automotive engine management system.}, language = {en} } @inproceedings{KraemerRaabMottoketal., author = {Kr{\"a}mer, Stefan and Raab, Peter and Mottok, J{\"u}rgen and Racek, Stanislav}, title = {Comparison of Enhanced Markov Models and Discrete Event Simulation - for evaluation of probabilistic Faults in safety-critical real-time task sets}, series = {Proceedings of EUROMICRO DSD 2014 - 17th Euromicro Conference on Digital System Design}, booktitle = {Proceedings of EUROMICRO DSD 2014 - 17th Euromicro Conference on Digital System Design}, doi = {10.1109/DSD.2014.42}, pages = {591 -- 598}, abstract = {In this paper we present simulation and model based approaches for evaluating and validating the temporal and safety relevant properties of software intensive safety-critical real-time embedded systems. A high level reliability model of a safe task execution is described by a continuous-time Markov process, enhanced by the modeling of execution times. It is shown that the behavior - regarding real-time and safety metrics - of this theoretical model can be transferred into an abstract system timing model, which then can be analyzed by a discrete event simulation approach. The verification of the discrete event simulation by Markov models offers the possibility of a holistic approach for reliability analysis combined with schedulability analysis of complex safety-critical multicore real-time systems by the discrete event simulation.}, language = {en} } @inproceedings{AlfransederDeubzerJustusetal., author = {Alfranseder, Martin and Deubzer, Michael and Justus, Benjamin and Mottok, J{\"u}rgen and Siemers, Christian}, title = {An Efficient Spin-Lock Based Multi-Core Resource Sharing Protocol}, series = {33rd IEEE International Performance, Computing, and Communications Conference (IPCCC), Austin (TX), USA, 5-7 December 2014}, booktitle = {33rd IEEE International Performance, Computing, and Communications Conference (IPCCC), Austin (TX), USA, 5-7 December 2014}, doi = {10.1109/PCCC.2014.7017090}, abstract = {We present in this paper a new lock-based resource sharing protocol PWLP (Preemptable Waiting Locking Protocol) for embedded multi-core processors. It is based on the busy-wait model and works with non-preemptive critical sections while task may be preempted by tasks with a higher priority when waiting for resources. Our protocol can be applied in partitioned as well as global scheduling scenarios, in which task-fix, job-fix or dynamically assigned priorities may be used. Furthermore, the PWLP permits nested requests to shared resources. Finally, we present a case study based on event-based simulations in which the FMLP (Flexible Multiprocessor Locking Protocol) and the proposed PWLP are compared.}, language = {en} } @inproceedings{AlfransederKrapfMaderetal., author = {Alfranseder, Martin and Krapf, Tobias and Mader, Ralph and Niemetz, Michael and Mottok, J{\"u}rgen and Siemers, Christian}, title = {An Efficient Partitioning Strategy for Runnables in Weakly Dependent Tasks on Embedded Multi-Core Systems}, series = {Embedded real-time software and systems (ERTS² 2014), Feb 2014, Toulouse, France}, booktitle = {Embedded real-time software and systems (ERTS² 2014), Feb 2014, Toulouse, France}, abstract = {With multi-core controllers entering the area of automotive control ECUs, strategies for parallelizing the control- algorithms come into focus. This paper deals with a special part of automotive powertrain software, called state transitions. Since dependencies between runnables executed there are weak, the transitions provide a good basis for parallelization. We present a strategy of how to distribute efficiently the execution of runnables to different cores while taking care of inner and outer dependencies. The strategy is accompanied by two case studies demonstrating the performance of the concept. The first one is carried out to find the most efficient strategies of parallelize state transitions based on randomly generated, simulated state transitions. In the second one, the developed partitioning strategies are applied to a real software project for an automotive powertrain system.}, language = {en} } @inproceedings{HelmDeubzerMottok, author = {Helm, C. and Deubzer, Michael and Mottok, J{\"u}rgen}, title = {Analyse der Echtzeiteigenschaften von Multicore Speicherarchitekturen in Eingebetteten Systemen mittels einer konfigurierbaren Simulationssoftware}, series = {4. Landshuter Symposium Mikrosystemtechnik : Mikrosystemtechnik als Schl{\"u}sseltechnologie der Systemintegration, Tagungsband zum Symposium 12./13. M{\"a}rz 2014, Hochschule Landshut}, booktitle = {4. Landshuter Symposium Mikrosystemtechnik : Mikrosystemtechnik als Schl{\"u}sseltechnologie der Systemintegration, Tagungsband zum Symposium 12./13. M{\"a}rz 2014, Hochschule Landshut}, editor = {Ivanov, Artem and Bicker, Marc and Patzelt, Peter}, address = {Landshut}, isbn = {978-3-9812696-5-9}, pages = {109 -- 117}, language = {de} } @inproceedings{LaloSchmidhuberDeubzeretal., author = {Lalo, Erjola and Schmidhuber, Stefan and Deubzer, Michael and Mottok, J{\"u}rgen}, title = {Extended Task Priority and Preemptability Optimization in Real-Time Multi-Core Embedded Systems}, series = {4th Applied Research Conference, 5th July 2014, Ingolstadt}, booktitle = {4th Applied Research Conference, 5th July 2014, Ingolstadt}, address = {Ingolstadt}, isbn = {978-3-8440-2875-1}, pages = {90 -- 95}, language = {en} } @inproceedings{ThielHacklMottok, author = {Thiel, P. and Hackl, Magnus and Mottok, J{\"u}rgen}, title = {Designing efficient Node.js applications - Approaching useful patterns}, series = {4th Applied Research Conference, 5th July 2014, Ingolstadt}, booktitle = {4th Applied Research Conference, 5th July 2014, Ingolstadt}, publisher = {Shaker}, address = {Aachen}, isbn = {978-3-8440-2875-1}, pages = {40 -- 46}, language = {en} } @inproceedings{HacklThielMottok, author = {Hackl, Magnus and Thiel, Patrik and Mottok, J{\"u}rgen}, title = {Not Only SQL - a comparison to traditional RDBMS}, series = {4th Applied Research Conference (ARC 2014), 5th July 2014, Ingolstadt}, booktitle = {4th Applied Research Conference (ARC 2014), 5th July 2014, Ingolstadt}, publisher = {Shaker}, address = {Aachen}, isbn = {978-3-8440-2875-1}, language = {en} } @inproceedings{RaabMottok, author = {Raab, Peter and Mottok, J{\"u}rgen}, title = {Modellbasierte Zuverl{\"a}ssigkeitsanalysen von arithmetischen Operationen in einem Prozessorsystem}, series = {Proceedings of safe.tech 2014, 20. und 21. Mai 2014, M{\"u}nchen}, booktitle = {Proceedings of safe.tech 2014, 20. und 21. Mai 2014, M{\"u}nchen}, language = {de} } @inproceedings{OklapiDeubzerSchmidhuberetal., author = {Oklapi, Erna and Deubzer, Michael and Schmidhuber, Stefan and Lalo, Erjola and Mottok, J{\"u}rgen}, title = {Optimization of Real-Time Multicore Systems Reached by a Genetic Algorithm Approach for Runnable Sequencing}, series = {2014 International Conference on Applied Electronics, Pilsen, Czech Republic}, booktitle = {2014 International Conference on Applied Electronics, Pilsen, Czech Republic}, doi = {10.1109/AE.2014.7011709}, pages = {233 -- 238}, abstract = {The deployment of complex real-time systems with everyday increasing demands and possibilities, is a challenging task for engineers when performance and efficiency have to be maximized while cost have to be minimized at the same time. For already designed systems it became necessary to perform different modifications in order to find optimal software architecture configuration by respecting all timing constraints which are essential when speaking of real-time systems. In this work, we present a model-based approach of optimizing the execution sequence of runnables within tasks in order to reduce the system's reaction times by improving the overall signal flow duration. Hereby, a genetic optimization algorithm is used to create and evaluate multiple solutions for the runnable sequencing problem. We conclude by demonstration the efficiency of the presented approach with experimental results.}, language = {en} } @incollection{MottokAlfransederSchmidhuberetal., author = {Mottok, J{\"u}rgen and Alfranseder, Martin and Schmidhuber, Stefan and Mucha, Matthias and Sailer, Andreas}, title = {How to improve the reactiveness and efficiency of embedded multicore systems by use of probabilistic simulation and optimization techniques}, series = {Improving Disaster Resilience and Mitigation - New Means and Tools. NATO Science for Peace and Security Series C: Environmental Security}, booktitle = {Improving Disaster Resilience and Mitigation - New Means and Tools. NATO Science for Peace and Security Series C: Environmental Security}, editor = {Teodorescu, Horia-Nicolai and Kirschenbaum, Alan and Cojocaru, Svetlana and Bruderlein, Claude}, publisher = {Springer}, address = {Dodrecht}, doi = {10.1007/978-94-017-9136-6_16}, pages = {253 -- 268}, abstract = {Safe and reliable multi-core technology becomes more and more important in the field of embedded systems. Today's and future embedded systems require increasing performance while being more energy efficient. Moreover, the functional safety for these embedded systems has to be improved or developed completely new. In this chapter, we first address the challenges of embedded multi-core real-time systems. To raise the resilience of such systems we use the deadlock-free synchronization model of Block et al. (A flexible real-time locking protocol for multiprocessors. 2012 IEEE international conference on embedded and real-time computing systems and applications, vol 0, pp 47-56, 2007). The metric mean Normalized Blocking Time (mNBT) is hereby used to measure the timing effects of the blocking behavior of strongly interacting tasks. In a second step, we present a model-based approach to map the tasks of an embedded real-time system to the cores of a multi-core processor. Moreover, we derive an execution time model from runtime measurements of software functions. This information is then used to perform precise probabilistic simulations of different task-to-core mappings and evaluate them with regard to task response times, inter-task blocking overhead and load distribution. Subsequently, we integrate the probabilistic simulation within an optimization technique to systematically improve the task-to-core mapping. We conclude with a case-study, where we demonstrate the effectiveness of the presented approach by optimizing the task-to-core mapping of a practical automotive powertrain system.}, language = {en} } @inproceedings{SoskaMottok, author = {Soska, Alexander and Mottok, J{\"u}rgen}, title = {A New Conceptual Contribution for Serious Games in Academic Software Engineering Education}, series = {European Conference on Software Engineering Education 2014 (ECSEE), 27 and 28 November 2014 in Seeon Monastery}, booktitle = {European Conference on Software Engineering Education 2014 (ECSEE), 27 and 28 November 2014 in Seeon Monastery}, publisher = {Shaker}, address = {Aachen}, isbn = {978-3-8440-3067-9}, pages = {241 -- 254}, abstract = {Nowadays, the popularity and field of application of serious games grows steadily. This educational method offers attractive pportunities for teaching and training by combining playful elements with learning content. By using game mechanics, thinking and technique, theoretical subject matters are treated in a fun and engaging way. Thereby, serious games utilize our intrinsic motivation to discover the surroundings in a playful manner. Embedded in educational settings, the goal is to mediate academic and non-academic knowledge to the students. Especially in the field of software engineering it is important to have skills which go beyond pure technical knowledge. Yet, the use of serious games is still a manageable amount. With this paper, we give a contribution to the theoretical design and development of serious games based on playful learning method and its relation to research-based learning in universal context. In addi- tion we analyze the existing serious games in software engineering and present our thoughts about planning our own.}, language = {en} } @inproceedings{AlfransederMuchaSchmidhuberetal., author = {Alfranseder, Martin and Mucha, Matthias and Schmidhuber, Stefan and Sailer, Andreas and Niemetz, Michael and Mottok, J{\"u}rgen}, title = {A modified synchronization model for dead-lock free concurrent execution of strongly interacting task sets in embedded systems}, series = {2013 International Conference on Applied Electronics (AE 2013), IEEE, 10-12 September 2013, Pilsen, Czech Republic}, volume = {18}, booktitle = {2013 International Conference on Applied Electronics (AE 2013), IEEE, 10-12 September 2013, Pilsen, Czech Republic}, pages = {13 -- 18}, abstract = {Global scheduling algorithms are very promising for application in embedded real-time systems using multi-core controllers. In this paper we want to make a first step forward to apply such scheduling methods on real existing systems. Especially a new resource model is necessary to avoid deadlocks, as this goal can not be achieved by using the standard OSEK Priority Ceiling Protocol when shared global resources are in use. We also introduce the new metric mean Normalized Blocking Time in order to be able to compare locking mechanisms according to the timing effects of their blocking behavior. Finally we give a simulative application example of the new metric by the use of two different kinds of semaphore models and an example task set typical for existing embedded real-time systems in the automotive powertrain environment.}, language = {en} }