TY - CHAP A1 - Münch, Andreas A1 - Frauenschläger, Tobias A1 - Mottok, Jürgen T1 - Integration of a Security Gateway for Critical Infrastructure into Existing PKI Systems T2 - 3. Symposium Elektronik und Systemintegration (ESI 2022), Tagungsband: 06. April 2022, Hochschule Landshut, Deutschland Y1 - 2022 SN - 978-3-9818439-7-2 SP - 88 EP - 97 PB - Hochschule Landshut CY - Landshut ER - TY - CHAP A1 - Fritz, Florian A1 - Schmid, Michael A1 - Mottok, Jürgen ED - Brinkmann, André T1 - Accelerating Real-Time Applications with Predictable Work-Stealing T2 - Architecture of computing systems - ARCS 2020: 33rd international conference, Aachen, Germany, May 25-28, 2020, proceedings N2 - Modern compute architectures often consist of multiple CPU cores to achieve their performance, as physical properties put a limit on the execution speed of a single processor. This trend is also visible in the embedded and real-time domain, where programmers are forced to parallelize their software to keep deadlines. Additionally, embedded systems rely increasingly on modular applications, that can easily be adapted to different system loads and hardware configurations. To parallelize applications under these dynamic conditions, often dispatching frameworks like Threading Building Blocks (TBB) are used in the desktop and server segment. More recently, Embedded Multicore Building Blocks (EMB2) was developed as a task-based programming solution designed with the constraints of embedded systems in mind. In this paper, we discuss how task-based programming fits such systems by analyzing scheduler implementation variants, with a focus on classic work-stealing and the libraries TBB and EMB2. Based on the state of the art we introduce a novel resource-trading concept that allows static memory allocation in a work-stealing runtime holding strict space and time bounds. We conduct benchmarks between an early prototype of the concept, TBB and EMB2, showing that resource-trading does not introduce additional runtime overheads, while unfortunately also not improving on execution time variances. KW - Real-time KW - Parallel programming KW - Work-stealing Y1 - 2020 U6 - https://doi.org/10.1007/978-3-030-52794-5_18 SP - 241 EP - 255 ER - TY - CHAP A1 - Frauenschläger, Tobias A1 - Renner, Sebastian A1 - Mottok, Jürgen T1 - Security Improvements by Separating the Cryptographic Protocol from the Network Stack onto a Multi-MCU Architecture T2 - Architecture of Computing Systems - ARCS 2020: 33rd international conference, Aachen, Germany, May 25-28, 2020, proceedings N2 - The number of IoT devices in SCADA and ICS systems is rising quickly, especially in the domain of critical infrastructures. But these kinds of systems are performing mission critical tasks like controlling devices in industrial facilities or substations in the smart grid. Therefore, they are subject to a lot of regulatory standards. Yet, to provide remote access over the internet, special architectures are developed to integrate a network interface into these devices without inferring with the actual functionality. However, these architectures either lack security measures against cyber-attacks or do not offer the necessary performance for time-critical communication interfaces. To solve that, an architecture consisting of three units is introduced in this paper to provide a network interface with extensive security measures and a high performance. The main feature is the isolation of the cryptographic functionality onto an additional MCU. After proposing the basic concept, the paper presents many implementation details. Based on the current state of implementation, a concept validation of the realized architecture is described. KW - Cyber-security KW - Functional safety KW - Network security KW - Industrial Internet of Things KW - Industrial Control System KW - Supervisory Control and Data Acquisition System Multi microcontroller setup Dos prevention Critical infrastructures KW - Multi microcontroller setup Dos prevention Critical infrastructures KW - Dos prevention KW - Critical infrastructures Y1 - 2020 U6 - https://doi.org/10.1007/978-3-030-52794-5_14 SP - 185 EP - 199 PB - Springer International Publishing ER - TY - CHAP A1 - Schmid, Michael A1 - Mottok, Jürgen T1 - Investigation of Scheduling Algorithms for DAG. Tasks through Simulations T2 - ERTS 2022, 11th European Congress Embedded Real Time Systems: 1-2 June, Toulouse, France N2 - In the real-time systems sector, various task models and corresponding tests exist to model and verify the schedulability of task sets on the system at hand. While those models and schedulability tests have intensively been studied from a theoretical point of view, it is hard to ma e use of them to compare the actual execution behavior of scheduling algorithms on a real system. In contrast to schedulability tests, simulators can help to investigate the performance of specific scheduling algorithms. One of the most generalized task models to describe parallel tasks is the Directed Acyclic Graph model that allows to represent tasks as a series of subtasks that depict the potentially parallel computations and precedence constraints that denote the order in which the subtasks are allowed to execute. In this paper, we investigate various scheduling algorithms for the Directed Acyclic Graph model. For that, we first recapitulate the examined scheduling algorithms in detail and point out relevant differences. Subsequently, we present the evaluation of different global and federated scheduling algorithms using fine-grained parallel tasks. To this end, we generate random Directed Acyclic Graph tasks and simulate their execution on multiprocessor systems using scheduling algorithms such as global rate-monotonic and semi-federated scheduling as well as global scheduling policies using the thread pool model. KW - real-time KW - scheduling KW - task models KW - simulation Y1 - 2022 UR - https://hal.archives-ouvertes.fr/hal-03700472/document ER - TY - GEN A1 - Renner, Sebastian A1 - Pozzobon, Enrico A1 - Mottok, Jürgen T1 - 3rd Round Ciphers Evaluation on Microcontrollers T2 - Lightweight Cryptography Workshop (virtual): May 9-11 2022 Y1 - 2022 UR - https://www.nist.gov/video/day-1-part-2-lightweight-cryptography-workshop-2022 PB - National Institute of Standards and Technology (NIST) CY - Gaithersburg ER - TY - CHAP A1 - De, Sangita A1 - Niklas, Michael A1 - Rooney, Brian A1 - Mottok, Jürgen A1 - Brada, Premek T1 - Towards Semantic model-to-model Mapping of Cross-Domain Component Interfaces for Interoperability of Vehicle Applications : An Approach towards Synergy Exploration T2 - MDE4IoT & ModComp 2019: Model-Driven Engineering for the Internet of Things (MDE4IoT) & Interplay of Model-Driven and Component-Based Software Engineering (ModComp); joint proceedings of the Workshop on Model-Driven Engineering for the Internet of Things (MDE4IoT) & of the Workshop on Interplay of Model-Driven and Component-Based Software Engineering (ModComp); co-located with the IEEE/ACM 22nd International Conference on Model Driven Engineering Languages and Systems (MODELS 2019), Munich, Germany, September 15 and 17, 2019 N2 - With the increase in demand of services in the automotive industry, automotive enterprises prefer to collaborate with other qualified cross-domain partners to provide complex automotive functions (or services), such as autonomous driving, OTA (Over The Air) vehicle update, V2X (Vehicle-to-Vehicle communication), etc. One key element in cross-domain enterprise collaboration is the mutual agreement between interfaces of software components. In this context, model-to-model mappings of software component models of heterogeneous frameworks for automotive services and to explore the synergies in their interface semantics, have become an essential factor in improving the interoperability among the automotive and other cross-domain enterprises. However, one of the challenges in achieving cross-domain component interface model-to-model mappings at an application level lies in detecting the interface semantics and the semantic relations that are conveyed in different component models in different frameworks. This paper addresses this challenge using a Model Driven Architecture (MDA) based analytical approach to explore interface semantic synergies in the cross-domain component meta-models that are used for automotive services. The approach applies manual semantic checking measurements at an application interface level to understand the meanings and relations between the different meta-model entities of cross-domain framework software components. In this research, we attempt to ensure that interface description models of software components from heterogeneous frameworks can be compared, correlated and re-used for automotive services based on semantic synergies. We have demonstrated our approach using component meta-models from cross-domain enterprises, that are used for the automotive application domain. Y1 - 2019 UR - https://ceur-ws.org/Vol-2442/paper8.pdf U6 - https://doi.org/10.13140/RG.2.2.28765.15840 PB - RWTH Aachen CY - Aachen ER - TY - CHAP A1 - De, Sangita A1 - Mottok, Jürgen A1 - Brada, Premek ED - Miraz, M.H. ED - Southall, G. ED - Ali, Maaruf ED - Ware, A. T1 - Evaluation of Semantic Interoperability of Automotive Service API Models Based on Metamodels Similarity Metrics Using a Semi-automated Approach T2 - iCETiC 2022 : 5th International Conference on Emerging Technologies in Computing 2022: Aug 15, 2022 - Aug 16, 2022, Chester, UK N2 - In recent years, mapping of application software components’ ontologies semantically emerged as a big research challenge in automotive application domain that manipulates several cross-enterprise synergy knowledge application frameworks. The same knowledge formalized by different experts in different vehicle application frameworks leads to heterogeneous representations of components’ interface data. Consequently, this causes the most daunting impediment in semantic interoperability between the service components in cooperative automotive systems. From a modeling perspective, in the absence of standardized domain-based unified modeling techniques, the orchestration and resolution of semantic data interoperability between various vehicle application frameworks’ components’ interface models remain a challenge. However, this challenge could be addressed using ontological metamodeling by specifying semantic associations between components’ interface model concepts based on the domain knowledge. Apart from the semantic mapping of interface ontological metamodels, this work also defines quality metrics to determine the degree of semantic alignment achieved between the various interface ontologies. Additionally, to reduce development time and cost towards semantic interoperability, this work proposes a semi-automated plugin tool for the applicability of the evaluated quality metrics to semantic mapping of real-world components’ interface models. KW - Framework KW - Interface KW - Metamodel KW - Metrics KW - Ontology KW - Semantic Y1 - 2023 U6 - https://doi.org/10.1007/978-3-031-25161-0_2 SP - 14 EP - 28 PB - Springer CY - Cham ER - TY - CHAP A1 - Rieger, Anna A1 - van de Par, Steven A1 - Rabl, Hans-Peter A1 - Oetjen, Arne T1 - Ein Ton macht noch keine Harmonie - Der Einfluss von Tonhaltigkeit und Dissonanz auf Präferenzurteile T2 - Fortschritte der Akustik - DAGA 2023, 49. Jahrestagung für Akustik, 06.-09. März 2023 in Hamburg N2 - Produkt- bzw. Maschinengeräusche mit deutlich hörbaren tonalen Komponenten werden häufig als lästig empfunden. Wenn zusätzlich eine Interaktion mehrerer tonaler Komponenten in Geräuschen stattfindet, was in realen Szenarien beispielsweise durch die Überlagerung tonaler Komponenten durch verschiedene Aggregate, wie Motoren und Getrieben, stattfindet, dann können Geräusche unterschiedlich tonal, aber auch unterschiedlich konsonant und dissonant wahrgenommen werden. Vorangehende Hörexperimente haben gezeigt, dass die Dissonanz bei ähnlicher Tonhaltigkeit der Geräusche einen großen Einfluss auf die Präferenzurteile hat. Des Weiteren konnte bereits ein grundlegendes Empfindungsmodell für die ”Dissonanz” sowie ein Präferenz-Prädiktor entwickelt werden, die die Subjektivdaten in hoher Güte vorhersagen konnten. In den hier vorgestellten Versuchen wurde das Zusammenspiel zwischen der empfundenen Tonhaltigkeit und der sich aus mehreren Tonkomponenten ergebenden Dissonanz auf die Präferenzurteile untersucht. In der Analyse wird aufgezeigt, auf welche Weise und in welchem Umfang die wahrgenommene Ausgeprägtheit der Tonhaltigkeit durch Interaktion mehrerer Tonkomponenten die allgemeine Geräuschqualität beeinflusst. Da verschiedene Grade der Dissonanz nur durch die gleichzeitige Anwesenheit tonaler Komponenten entstehen können, ist das Zusammenspiel beider Größen bei der Bildung eines Präferenzurteils von einer speziellen Natur. Dies wird sowohl bei der Modellierung der Interaktion beider Größen als auch im Vorhersagemodell der Dissonanz berücksichtigt. Y1 - 2023 UR - https://pub.dega-akustik.de/DAGA_2023/data/articles/000412.pdf SN - 978-3-939296-21-8 SP - 1167 EP - 1170 PB - Deutsche Gesellschaft für Akustik e.V. (DAGA) CY - Berlin ER - TY - JOUR A1 - Zellner, Gregor T1 - Ein Grundriss der Wissenschaftsdisziplin Wirtschaftsinformatik JF - BIT Banking and Information Technology N2 - Dieser Beitrag gibt einen Grundriss der Wissenschaftsdisziplin Wirtschaftsinformatik (WI) und ihrer Entwicklung. Hierzu wird zunächst der Gegenstand der WI näher betrachtet, nämlich die Informationssysteme. Dann wird erläutert, welche Ziele die WI verfolgt. Da WI ein interdisziplinäres Fach ist, werden anschließend die bestimmenden Basiswissenschaften der WI im Rahmen des Grundsystems der Wissenschaften dargestellt. Dabei wird deutlich, dass der Einfluss unterschiedlicher Disziplinen den Methodenpluralismus in der WI befördert. Im Beitrag werden die zwei grundlegenden Forschungsparadigmen in Form des verhaltensorientierten und des gestaltungsorientierten Ansatzes näher betrachtet. Nach einem kurzen Einblick in die zeitliche Entwicklung der deutschsprachigen WI werden die Themen-und Tätigkeitsfelder der WI näher erörtert. Abschließend wird ein Ausblick auf die Herausforderungen in der WI gegeben. KW - Wissenschaftsdisziplin Wirtschaftsinformatik Y1 - 2024 VL - Band 25, März 2024 IS - 1 ER -