TY - CHAP A1 - Weiss, Nils A1 - Renner, Sebastian A1 - Mottok, Jürgen A1 - Matoušek, Václav T1 - Automated Threat Evaluation of Automotive Diagnostic Protocols T2 - ESCAR USA, 2021, Virtual N2 - Diagnostic protocols in automotive systems can offer a huge attack surface with devastating impacts if vulnerabilities are present. This paper shows the application of active automata learning techniques for reverse engineering system state machines of automotive systems. The developed black-box testing strategy is based on diagnostic protocol communication. Through this approach, it is possible to automatically investigate a highly increased attack surface. Based on a new metric, introduced in this paper, we are able to rate the possible attack surface of an entire vehicle or a single Electronic Control Unit (ECU). A novel attack surface metric allows comparisons of different ECUs from different Original Equipment Manufacturers (OEMs), even between different diagnostic protocols. Additionally, we demonstrate the analysis capabilities of our graph-based model to evaluate an ECUs possible attack surface over a lifetime. KW - Automotive Diagnostic Protocols KW - Security Metrics KW - Automated Network Scan Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-29882 ER - TY - JOUR A1 - Herrmann, Frank A1 - Kirschner, Jan Michael A1 - Kleinert, Thomas A1 - Fritzsche, Harald T1 - Big Data im Bereich der technischen Sauberkeit JF - Anwendungen und Konzepte der Wirtschaftsinformatik (AKWI) N2 - Dieses Projekt befasst sich mit Fragestellungen zur Anwendung von künstlicher Intelligenz im Bereich der Technischen Sauberkeit. Durch Literaturforschungen, die einen Ablauf nach Fettke 2006 haben, werden KI-Anwendungen gesucht, die bereits im Zusammenhang mit der Technischen Sauberkeit verwendet werden. Die Forschungen konnten zwölf Literaturquellen ermitteln. Durch diese Literaturanalyse wurde festgestellt, dass 91 Prozent CV (Computer Vision) zur Partikelerkennung verwenden. Aus diesem Grund wurde anschließend ein CV Modell zur Partikelerkennung implementiert. Durch die Konfusionsmatrix konnte eine Treffergenauigkeit von 82 Prozent festgestellt werden. Daraus folgt, dass eine Partikelklassifikation möglich ist. Abschließend wurde eine weitere Literaturforschung zu Text Mining Applikationen durchgeführt, da der Bereich der Qualitätsanalyse im Monitoring laut Aufgabenstellung eingezogen werden sollte. In dieser konnte kein positives Ergebnis erzielt werden, da speziell nach fertigen Anwendungen gesucht wurde, die Analysetexte im Bereich der technischen Sauberkeit kategorisieren können. Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-30550 SN - 2296-4592 IS - 13 SP - 34 EP - 42 PB - Hochschule CY - Luzern ER - TY - JOUR A1 - Froese, Vincent A1 - Jain, Brijnesh A1 - Niedermeier, Rolf A1 - Renken, Malte T1 - Comparing temporal graphs using dynamic time warping JF - Social Network Analysis and Mining N2 - Within many real-world networks, the links between pairs of nodes change over time. Thus, there has been a recent boom in studying temporal graphs. Recognizing patterns in temporal graphs requires a proximity measure to compare different temporal graphs. To this end, we propose to study dynamic time warping on temporal graphs. We define the dynamic tem- poral graph warping (dtgw) distance to determine the dissimilarity of two temporal graphs. Our novel measure is flexible and can be applied in various application domains. We show that computing the dtgw-distance is a challenging (in general) NP-hard optimization problem and identify some polynomial-time solvable special cases. Moreover, we develop a quadratic programming formulation and an efficient heuristic. In experiments on real-world data, we show that the heuristic performs very well and that our dtgw-distance performs favorably in de-anonymizing networks compared to other approaches. Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-38493 VL - 10 SP - 1 EP - 16 PB - Springer Nature ER - TY - JOUR A1 - Westner, Markus T1 - Rezension "Designed for Digital". BT - Ross, J. W., Beath, C. M., & Mocker, M. (2019). Designed for digital: How to architect your business for sustained success. The MIT Press. ISBN 978-0262042888 JF - HMD Praxis Der Wirtschaftsinformatik Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-38626 N1 - Corresponding author: Markus Westner PB - Springer Nature ER - TY - GEN ED - Nees, Franz ED - Stengel, Ingo ED - Meister, Vera G. ED - Barton, Thomas ED - Herrmann, Frank ED - Müller, Christian ED - Wolf, Martin R. T1 - Angewandte Forschung in der Wirtschaftsinformatik 2020 : Tagungsband zur 33. AKWI-Jahrestagung am 14.09.2020 ausgerichtet von der Hochschule Karlsruhe - Wirtschaft und Technik KW - Wirtschaftsinformatik Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-13840 SN - 978-3-944330-66-2 PB - mana-Buch CY - Heide ER - TY - JOUR A1 - Schildgen, Johannes T1 - Interaktive Vorlesungsfolien mit SQL-Unterstützung JF - Datenbank-Spektrum N2 - Mit PowerPoint oder LaTeX Beamer erstellte Vorlesungsfolien sind meist statisch und dienen hauptsächlich der Präsentation von Lehrinhalten. Als Alternative dazu werden drei Erweiterungen für das HTML- und JavaScript-basierte Präsentationsframework reveal.js vorgestellt, die für mehr Interaktion in der Datenbankenlehre sorgen sollen: (1) Eine Live-Ausführung von SQL-Anfragen und eine Darstellung des Anfrageergebnisses direkt auf der Folie; mit Möglichkeit zur Anpassung der Anfrage im Präsentationsbetrieb, (2) eine JSON-basierte Beschreibung von ER-Diagrammen, welche graphisch auf den Folien dargestellt werden sollen und (3) eingebettete Smartphone-Umfragen, um zwischendurch – ohne einen Kontextwechsel – Quiz-Fragen zu stellen. Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-26059 N1 - Corresponding author: Johannes Schildgen VL - 21 IS - 1 SP - 19 EP - 27 PB - Springer Nature ER - TY - JOUR A1 - Wulf, Frederik A1 - Westner, Markus A1 - Strahringer, Susanne T1 - We have a platform, but nobody builds on it – what influences Platform-as-a-Service post-adoption? JF - International Journal of Information Systems and Project Management N2 - When higher-level management of a company has strategically decided to adopt Platform-as-a-Service (PaaS) as a Cloud Computing (CC) delivery model, decision-makers at lower hierarchy levels still need to decide whether they want to post-adopt PaaS for building or running an information system (IS) – a decision that numerous companies are currently facing. This research analyzes the influential factors of this managerial post-adoption decision on the IS-level. A survey of 168 business and Information Technology (IT) professionals investigated the influential factors of this PaaS post-adoption decision. The results show that decision-makers’ perceptions of risks inhibit post-adoption. Vendor trust and trialability reduce these perceived risks. While competitive pressure increases perceived benefits, it does not significantly influence PaaS post-adoption. Controversially, security and privacy, cost savings, and top management support do not influence post-adoption, as opposed to findings on company-level adoption. Subsamples constructed by the form of post-adoptive use (migration of IS, enhancement of IS, new IS development) exhibit better goodness-of-fit measures than the full sample. Future research should explore this interrelation of the form of post-adoptive use and the post-adoption influence factors. KW - Platform-as-a-Service KW - cloud computing KW - post-adoption KW - delivery model Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-33778 SN - 2182-7788 VL - 10 IS - 1 SP - 49 EP - 70 ER - TY - JOUR A1 - Strahringer, Susanne A1 - Westner, Markus T1 - Von der IT-Leitung zur (Mit-)Gestaltung der digitalen Transformation BT - Die sich wandelnde Rolle der Führung in der IT JF - HMD Praxis der Wirtschaftsinformatik N2 - Die entsprechenden Antworten, wie die IT-Führung in Unternehmen auszugestalten sei, ist Gegenstand vielfältiger Forschung und im Ergebnis situativ aber nicht abschließend zu beantworten. Das vorliegende Schwerpunktheft greift diesen Aspekt auf und beleuchtet die Zukunft der Führung in der IT. Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-39922 VL - 59 SP - 717 EP - 720 PB - Springer ER - TY - THES A1 - Frikel, Jürgen T1 - Reconstructions in limited angle x-ray tomography: Characterization of classical reconstructions and adapted curvelet sparse regularization N2 - This thesis is devoted to the problem of tomographic reconstruction at limited angular range. In the first part, we prove a characterization of filtered backprojection reconstructions from limited angle data. Moreover, we develop a strategy for artifact reduction and stabilization. In the second part, we introduce a new edge-preserving reconstruction algorithm for limited angle tomography and analyze this algorithm mathematically. Some numerical experiments are also presented. N2 - Diese Arbeit beschäftigt sich mit der tomographischen Rekonstruktion bei eingeschränktem Winkelbereich. Im ersten Teil wird eine Charakterisierung der Rekonstruktionen mittels gefilterter Rückprojektion bewiesen. Darüberhinaus wird eine Strategie zur Artefaktreduktion und Stabilisierung entwickelt. Der zweite Teil stellt einen neuen kantenerhaltenden Rekonstruktionsalgorithmus für die Computertomographie bei eingeschränktem Winkelbereich vor and analysiert diesen mathematisch. Numerische Experimente runden die Arbeit ab. KW - Computertomographie KW - Optimale Rekonstruktion KW - Regularisierungsverfahren Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:91-diss-20130328-1115037-0-3 UR - https://mediatum.ub.tum.de/?id=1115037 PB - Technische Universität München CY - München ER - TY - INPR A1 - Göppel, Simon A1 - Frikel, Jürgen A1 - Haltmeier, Markus T1 - A complementary ℓ1 -TV reconstruction algorithm for limited data CT N2 - In a variety of tomographic applications, data cannot be fully acquired, leading to severely underdetermined image reconstruction. Conventional methods result in reconstructions with significant artifacts. In order to remove these artifacts, regularization methods have to be applied that incorporate additional information. An important example is TV reconstruction which is well known to efficiently compensate for missing data and well reduces reconstruction artifacts. At the same time, however, tomographic data is also contaminated by noise, which poses an additional challenge. The use of a single regularizer within a variational regularization framework must therefore account for both the missing data and the noise. However, a single regularizer may not be ideal for both tasks. For example, the TV regularizer is a poor choice for noise reduction over different scales, in which case ℓ1 curvelet regularization methods work well. To address this issue, in this paper we introduce a novel variational regularization framework that combines the advantages of two different regularizers. The basic idea of our framework is to perform reconstruction in two stages, where the first stage mainly aims at accurate reconstruction in the presence of noise, and the second stage aims at artifact reduction. Both reconstruction stages are connected by a data proximity condition. The proposed method is implemented and tested for limited-view CT using a combined curvelet-TV approach. We define and implement a curvelet transform adapted to the limited view problem and demonstrate the advantages of our approach in a series of numerical experiments in this context. KW - Image reconstruction KW - limited data KW - artifact reduction KW - sparse regularization KW - complementary image reconstruction KW - wedge-adapted curvelets Y1 - 2023 ER - TY - JOUR A1 - Herrmann, Frank A1 - Nangmo Wanko, Merveille A1 - Zeller, Bernhard T1 - Digitale Transformation in Echtzeit: Die Ziele von morgen basierend auf dem Datenmodell von gestern JF - Anwendungen und Konzepte der Wirtschaftsinformatik N2 - Die Digitale Transformation fordert Unternehmen aller Couleur. Ironischer Weise sind es gerade die bisher verwendeten IT-Systeme mit ihren starren Strukturen, die Unternehmen in Ihrer digitalen Trans-formation oft ausbremsen. Auch wenn die Soft-warehersteller längst reagiert haben und neue, flexib-lere Versionen ihrer Produkte anbieten, so ist ein größerer Softwarewechsel immer noch eine Heraus-forderung für Unternehmen und ein Schritt der wohl-überlegt und geplant sein will. In dieser Arbeit wird deshalb ein Vorgehen vorge-stellt, um mittels In-Memory Technologie und Vir-tualisierung zumindest die wichtigsten Ergebnisse der Transformation bereits auf den bestehenden Da-tenmodellen in Echtzeit zu generieren. Dadurch wird genug Zeit gewonnen, um die eigentliche Transfor-mation der IT-Landschaft geplant und mit der not-wendigen Sorgfalt durchzuführen. KW - Digitale Transformation KW - Strategie KW - ALV-GRID KW - Dynpro Y1 - 2022 U6 - https://doi.org/10.26034/lu.akwi.2022.3453 SN - 2296-4592 VL - 16 SP - 37 EP - 47 PB - Technische Hochschule Wildau ER - TY - GEN A1 - Ramsauer, Ralf A1 - Bulwahn, Lukas A1 - Lohmann, Daniel A1 - Mauerer, Wolfgang T1 - The Sound of Silence: Mining Security Vulnerabilities from Secret Integration Channels in Open-Source Projects T2 - MiniDebConf Regensburg (MDC) 2021 Y1 - 2021 UR - https://gemmei.ftp.acc.umu.se/pub/debian-meetings/2021/MiniDebConf-Regensburg/sound-of-silence.webm CY - Regensburg ER - TY - GEN A1 - Reuter, Rebecca A1 - Langer, Thomas A1 - Hauser, Florian A1 - Muckelbauer, Daniel A1 - Gegenfurtner, Andreas T1 - Automatic generation of areas of interest in eye tracking: The case of software engineering T2 - Earli Book of Abstracts Y1 - 2019 UR - https://earli.org/sites/default/files/2019-09/BOA-2019.pdf PB - RWTH Aachen ER - TY - GEN A1 - Schildgen, Johannes T1 - Sprachkurs Java BT - Das Hörbuch über objektorientierte Programmierung N2 - Java ist eine der populärsten Programmiersprachen überhaupt. Lerne in diesem Hörbuch die Sprache Java und die Konzepte der objektorientierten Programmierung kennen, egal ob bei der Autofahrt, beim Putzen oder Kochen. Wir beginnen mit den Grundlagen übers Programmieren im Allgemeinen. Ein Vorwissen in einer Programmiersprache ist zwar hilfreich, aber absolut nicht notwendig. Du lernst, was Variablen, Schleifen, Klassen und Methoden sind und wie du sie verwendest. Eines der wichtigsten Konzepte der objektorientierten Programmierung nennt sich Vererbung. Daher wirst du alles dazu lernen, was du wissen musst. Auch den Umgang mit Exceptions und mit Dateien will ich dir ans Herz legen. Du lernst zudem die verschiedenen Collection-Types, Generics und Lambda-Ausdrücke kennen. Außerdem gibt's am Ende noch einen Ausblick, der zeigt, was du mit Java alles programmieren kannst: Android-Apps, GUI-Anwendungen, Web-Apps und vieles mehr. Programmieren lernen mit einem Hörbuch ist ein innovatives Format und bietet interaktive Möglichkeiten der Lernkontrolle in Form von Quiz-Fragen, bei denen du als Hörer aktiv mitmachen kannst. Y1 - 2022 SN - 9783944787404 N1 - MP3 Audio CD PB - oomoxx media e.K. CY - Cuxhafen ET - 1. Aufl. ER - TY - CHAP A1 - Windbühler, Anna A1 - Okkesim, Sükrü A1 - Christ, Olaf A1 - Mottaghi, Soheil A1 - Rastogi, Shavika A1 - Schmuker, Michael A1 - Baumann, Timo A1 - Hofmann, Ulrich G. T1 - Machine Learning Approaches to Classify Anatomical Regions in Rodent Brain from High Density Recordings T2 - 44th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2022): 11-15 July 2022, Glasgow, Scotland, United Kingdom N2 - Identifying different functional regions during a brain surgery is a challenging task usually performed by highly specialized neurophysiologists. Progress in this field may be used to improve in situ brain navigation and will serve as an important building block to minimize the number of animals in preclinical brain research required by properly positioning implants intraoperatively. The study at hand aims to correlate recorded extracellular signals with the volume of origin by deep learning methods. Our work establishes connections between the position in the brain and recorded high-density neural signals. This was achieved by evaluating the performance of BLSTM, BGRU, QRNN and CNN neural network architectures on multisite electrophysiological data sets. All networks were able to successfully distinguish cortical and thalamic brain regions according to their respective neural signals. The BGRU provides the best results with an accuracy of 88.6 % and demonstrates that this classification task might be solved in higher detail while minimizing complex preprocessing steps. Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-35296 SP - 3530 EP - 3533 PB - IEEE ER - TY - GEN A1 - Mauerer, Wolfgang T1 - Embedded Linux Quality Assurance: How to Not Lie with Statistics T2 - Embedded Linux Conference North America ; OpenIoTSummit North America N2 - Embedded Linux drives an every-increasing number of appliances in many domains and applications, some even real-time and/or safety critical. Traditional quality assurance of such systems is based on testing and formal verification, but the huge amount of code and the rapid dynamics of the Linux ecosystem, as well as fundamental limitations of formal methods make these approaches unsatisfactory. Statistical quality assurance for reliability, error rates, maximal latencies etc. is needed. We will discuss current best practises, how to design and run automated statistical tests that capture relevant information, and how to properly evaluate the resulting data. Practical real-world examples and recipes are played through using the open source R language. Most importantly, we identify common mistakes in (over-)interpreting statistical results and predictions that may eventually harm people. Y1 - 2018 UR - https://www.youtube.com/watch?v=8671RYrsAj4 ER - TY - GEN A1 - Ramsauer, Ralf A1 - Kiszka, Jan A1 - Mauerer, Wolfgang T1 - Building Mixed Criticality Linux Systems with the Jailhouse Hypervisor T2 - Embedded Lunux Conference + OpenIoTSummit, Portland, OR, 21.-23.02.2017 N2 - The partitioning hypervisor Jaihouse allows us to run safety critical and uncritical applications in parallel on a single SoC. We present our experiences when porting a safety and real-time critical existing application as a Jailhouse guest. It shows a novel and promising approach for implementing mixed-criticality applications with real-time requirement while not loosing the benefits of Linux. This is done by static partitioning of hardware resources; guests do not interfere. We will present a multicopter platform running the real-time critical flight stack in an isolated Jailhouse guest. This proves the practicability of Jailhouse as well as the suitability for real-time safety critical systems by porting an existing application to a Jailhouse cell. We stress its concept and show up current hardware limitations, like undesired behaviour and present possible workarounds and solutions. Y1 - 2017 UR - https://www.youtube.com/watch?v=pvs0fv-gnvw ER - TY - GEN A1 - Ramsauer, Ralf A1 - Duda, Sebastian A1 - Bulwahn, Lukas A1 - Mauerer, Wolfgang T1 - The list is our process! An analysis of the kernel’s email-based development process T2 - Embedded Linux Conference Europe, Lyon 28.10.2019 Y1 - 2019 UR - https://elinux.org/images/0/09/Pasta-elce19.pdf ER - TY - GEN A1 - Ramsauer, Ralf A1 - Duda, Sebastian A1 - Mauerer, Wolfgang A1 - Bulwahn, Lukas T1 - The list is our process: An analysis of the kernel’s email-based development process T2 - Linux Plumbers Conference, Lisbon September 9, 2019 Y1 - 2019 UR - https://www.youtube.com/watch?v=QG1YDQ1HOKE ER - TY - GEN A1 - Ramsauer, Ralf A1 - Kiszka, Jan A1 - Lohmann, Daniel A1 - Mauerer, Wolfgang T1 - Implementierung gemischt kritischer Systeme durch statische Hardwarepartitionierung T2 - Frühjahrstreffen der Fachgruppen Betriebssysteme, Hannover, 2. März 2018 Y1 - 2018 UR - https://www.betriebssysteme.org/wp-content/uploads/2018/04/fgbs18-169.pdf ER - TY - GEN A1 - Mauerer, Wolfgang T1 - Safety, Security, Quality: Artificial Intelligence versus Common Sense T2 - Open Source Summit North America and Embedded Linux Conference North America 2020 Y1 - 2020 UR - https://www.youtube.com/watch?v=Ow_tMneQlH4 UR - https://elinux.org/images/7/7d/Wolfgang_Mauerer.pdf ER - TY - GEN A1 - Ramsauer, Ralf A1 - Kiszka, Jan A1 - Mauerer, Wolfgang T1 - Spectre and Meltdown vs. Real-Time: How Much do Mitigations Cost? T2 - Embedded Linux Conference Europe 2018, October 22 - 24, 2018, Edinburgh, UK Y1 - 2018 UR - https://www.youtube.com/watch?v=nqU4j2M_Ul4 ER - TY - GEN A1 - Mauerer, Wolfgang T1 - Open Source in Research and Reality T2 - Open Source Summit North America and Embedded Linux Conference North America 2020 Y1 - 2020 UR - https://www.youtube.com/watch?v=L2iubyD1e7U ER - TY - GEN A1 - Ramsauer, Ralf A1 - Lohmann, Daniel A1 - Mauerer, Wolfgang T1 - Quantifying Upstream Integration with PaStA T2 - LTSI Workshop @ ELC17 Y1 - 2017 ER - TY - GEN A1 - Mauerer, Wolfgang T1 - Approaches to Ultra Long-Term System Maintenance T2 - Embedded Linux Conference Europe (Berlin), 2016 Y1 - 2016 UR - https://www.youtube.com/watch?v=SAbrQqSC61M ER - TY - GEN A1 - Mauerer, Wolfgang T1 - Socio-Technical Aspects of Long Term Embedded Systems Maintenance T2 - Embedded Linux Conference, April 4-6, 2016, San Diego Y1 - 2016 ER - TY - GEN A1 - Frikel, Jürgen A1 - Göppel, Simon A1 - Haltmeier, Markus T1 - Combining reconstruction and edge detection in CT T2 - BVM Workshop 2023, 02.-04. Juli 2023, Braunschweig N2 - We present two methods that combine image reconstruction and edge detection in computed tomography (CT) scans. Our first method is as an extension of the prominent filtered backprojection algorithm. In our second method we employ ℓ1-regularization for stable calculation of the gradient. As opposed to the first method, we show that this approach is able to compensate for undersampled CT data. Y1 - 2021 UR - https://www.bvm-workshop.org/wp-content/uploads/2021/02/3091_poster.pdf ER - TY - GEN A1 - Frikel, Jürgen T1 - Adapted curvelet sparse regularization in limited angle tomography T2 - Summer School: New Trends and Directions in Harmonic Analysis, Fractional Operator Theory, and Image Analysis, Inzell, Germany, September 17 - 21, 2012 Y1 - 2012 UR - https://www.fim.uni-passau.de/fileadmin/dokumente/fakultaeten/fim/lehrstuhl/forster-heinlein/Inzell2012/Inzell_Frikel_2012_small.pdf ER - TY - GEN A1 - Mintel, Mario A1 - Ramsauer, Ralf A1 - Lohmann, Daniel A1 - Scherzinger, Stefanie A1 - Mauerer, Wolfgang T1 - Fork à la carte für In-Memory-Datenbanken T2 - Frühjahrstreffen der Fachgruppen Betriebssysteme, Hamburg, 17. März 2022 Y1 - 2022 UR - https://www.lfdr.de/Publications/2022/FGBS_Spring22_Mintel.pdf ER - TY - INPR A1 - Bock, Sebastian A1 - Weiß, Martin Georg T1 - Rotation Detection of Components with Convolutional Neural Networks N2 - The main issues in many image processing applications are object recognition and detection of objects, which answers the questions whether an object is present and if it is present, where it is located. Popular object detection algorithms like YOLO use a regression formulation for the whole problem, especially for the bounding box parameters. In production industry the setting usually is different: One usually knows the object type and rather wants to know with high precision where the object is. We study a prototype application in this area where we identify the rotation of an object in a plane. To solve this problem use a regression approach with a CNN architecture as a function approximator. We compare our results to standard image processing algorithms, which do not use neural networks, and present quantitative results on the accuracy. CNNs seem at least competitive to classical image processing. KW - Neural networks KW - Network Architecture KW - CNN KW - Functionapproximation KW - Image orientation Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-4120 ER - TY - CHAP A1 - Schwertsik, Andreas A1 - Westner, Markus T1 - Produktorientierte IT-Leistungsverrechnung als Brückenschlag zwischen IT-Leistungserstellung und -verwendung BT - Fallstudie anhand eines international führenden Industriegüterunternehmens T2 - Prozesse, Technologie, Anwendungen, Systeme und Management : Tagungsband zur 27. AKWI-Fachtagung vom 07. bis 10.09.2014 an der Oberbayerischen Technischen Hochschule Regensburg / hrsg. von Thomas Barton N2 - Das vorliegende Paper untersucht anhand einer Fallstudie die Implementierung einer produktorientierten Leistungsverrechnung für IT-Services im Kontext eines international führenden Industriegüterunternehmens. Zunächst werden die ökonomischen und regulatorischen Anforderungen, die zur Ein-führung des Systems geführt haben, skizziert. Danach wird der Aufbau und Ablauf des Verrechnungsverfahrens geschildert: auf IT-Leistungserstellungs-seite werden die angefallenen Kosten über die Bildung sogenannter modularer „Service-Bausteine“ den organisatorisch verantwortlichen Stellen als auch IT-Services zugeordnet. Auf Basis der geplanten Nachfragemenge werden diese IT-Services bepreist und in einem IT-Servicekatalog verzeichnet. Dort können sie von den Fachbereichen nachgefragt werden. Im Sinne von Vorteilen werden u.a. eine verursachungsgerechte Kostenverteilung ermöglicht, Kostentransparenz und -vergleichbarkeit geschaffen sowie das Kostenbewusstsein bei Leistungsempfängern und -erstellern gefördert. Als Nachteil erweist sich der administrative Aufwand zur Durchführung der Kalkulation und in der Folge eine gewisse Statik des Systems, da unterjährige Änderungen nur unter Inkaufnahme von Zusatzaufwand nachgesteuert werden können. KW - IT-Abteilung KW - Innerbetriebliche Leistungsverrechnung Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-928 UR - https://www.oth-regensburg.de/fileadmin/media/fakultaeten/im/akwi/AKWI_TAGUNG_2014_Tagungsband.pdf SP - 78 EP - 91 ER - TY - GEN A1 - Mauerer, Wolfgang A1 - Ramsauer, Ralf A1 - Kölbl, Andreas T1 - The Many Approaches to Real-Time and Safety-Critical Linux T2 - Open Source Summit Japan 2017 Y1 - 2017 UR - http://events17.linuxfoundation.org/sites/events/files/slides/talk_10.pdf ER - TY - GEN A1 - Bielmeier, Benno A1 - Mauerer, Wolfgang T1 - Semi-Formal Verification of Embedded Linux Systems Using Trace-Based Models T2 - Semi-Formal Verification of Embedded Linux Systems Using Trace-Based Models Y1 - 2023 UR - https://www.lfdr.de/Publications/2022/bielmeier_ossj22.pdf UR - https://www.youtube.com/watch?v=w42ab8-CH1o ER - TY - GEN A1 - Renner, Sebastian A1 - Pozzobon, Enrico A1 - Mottok, Jürgen T1 - Current and Future Efforts in Benchmarking NIST LWC Ciphers T2 - 4th Lightweight Cryptography Workshop 2020 at NIST, Gaithersburg, USA Y1 - 2020 UR - https://csrc.nist.gov/CSRC/media/Presentations/efforts-in-benchmarking-lwc-ciphers/images-media/session-4-renner-current-future-benchmarking.pdf ER - TY - GEN A1 - Krämer, Stefan T1 - Effects of Arbitrary Hardware Faults on Multicore Scheduling in Safety-critical Applications – Evaluation by enhanced Markov models and discrete event simulation T2 - 2014 PESW - The 2nd Prague Embedded Systems Workshop, June 2014 Y1 - 2014 UR - https://pesw.fit.cvut.cz/2014/presentations/pesw2014_Kramer.pdf ER - TY - GEN A1 - Bärwald, Andreas A1 - Mottok, Jürgen T1 - Zertifizierung von Werkzeugen und Werkzeugketten T2 - Software im Automobil, Stuttgart, 04./05. Mai 2010 Y1 - 2010 UR - https://de.slideshare.net/AndreasBaerwald/zertifizierung-von-werkzeugen-und-werkzeugketten ER - TY - GEN A1 - Deubzer, Michael A1 - Mottok, Jürgen A1 - Flug, Christian A1 - Zeitler, Thomas T1 - A method of performance analysis for embedded system architectures BT - Poster-Session T2 - 8. Tag der Technik am 13. Juni 2008 an der Hochschule Regensburg Y1 - 2008 ER - TY - GEN A1 - Alfranseder, Martin A1 - Schmidhuber, Stefan A1 - Mucha, Matthias A1 - Sailer, Andreas A1 - Mottok, Jürgen T1 - How to improve the reactiveness and efficiency of embedded multicore systems by use of probabilistic simulation and optimization techniques: A case study BT - Invited Poster Session T2 - Advanced Research Workshop: Improving Disaster Resilience and Mitigation - New Means and Tools, Trends, Iasi Y1 - 2013 ER - TY - GEN A1 - Kratzer, Simon A1 - Strahringer, Susanne A1 - Westner, Markus T1 - Fractional CIOs in SMEs BT - Study Results on an Emerging IT Leadership Model T2 - 2024 2nd International Conference on Management Information Systems (ICMIS 2024), September 28-30, 2024, Tokyo, Japan N2 - To remain competitive, small and medium-sized enterprises (SMEs) need to man-age information technology (IT) effectively. Unlike larger organisations, SMEs often face limited resources and challenges in attracting talent, and typically lack the need for a full-time Chief Information Officer (CIO). In response, a growing number of professionals around the world are offering CIO services on a part-time, shared basis to multiple clients. This model provides SMEs with affordable and flexible access to experienced IT leadership. Known as 'fractional CIOs', these professionals deliver significant value, yet there has been little academic re-search into this phenomenon. Our study, conducted between 2020 and 2023 with 62 Fractional CIOs in 10 countries, aims to fill this gap. It provides a clear defini-tion of fractional CIOs, outlines their engagement models and identifies the key factors that contribute to their success. The findings are intended to enlighten both academics and industry professionals. KW - Fractional CIO KW - Strategic IT Management KW - SME Y1 - 2024 VL - 2 ER - TY - GEN A1 - Weiss, Nils A1 - Pozzobon, Enrico T1 - IOT Backdoors in Cars T2 - IT Security Conference Troopers19, 2019, Heidelberg, Germany N2 - Connecting cheap IoT devices to the safety-critical network of a car can be an extremely bad idea, but at least it allows us to hack together our own automotive gadget. This talk explains the complete procedure involved in transforming a cheap OBD GSM dongle designed for fleet management into a open source automotive hacking tool. First, the hardware reverse engineering is demonstrated, showing how each component is interconnected and working together. With this knowledge, it was possible to capture the communication of the GSM module and understand the OTA protocol used by this dongle, which can be used to extract the firmware. A quick reverse engineering of the software will show that no cryptographic authentication is used for the OTA updates, and therefore a pirate GSM BTS can be used to obtain remote code execution. After that, a new open source firmware is written for the device, which can easily be extended and controlled remotely with the LUA scripting language. Examples on how hacking this dongle remotely can affect the safety of the driver will be also given. Y1 - 2019 UR - https://troopers.de/troopers19/agenda/mud7fn/ ER - TY - GEN A1 - Weiss, Nils A1 - Pozzobon, Enrico T1 - Automotive Penetration Testing with Scapy T2 - IT Security Conference Troopers19, 2019, Heidelberg, Germany N2 - This talk will provide a general overview on how Scapy can be used for automotive penetration testing. All present features of Scapy for automotive penetration will be introduced and explained. Also an overview of higher level automotive protocols will be given. As automotive penetration testing becomes more important, the lack of free tools for automotive network penetration testing led us to integrate new features in Scapy. Scapy is a well established framework for packet manipulation. The flexibility of Scapy allowed us to implement automotive interfaces (CAN) and automotive protocols (ISOTP, GMLAN, UDS, DoIP, OBD-II). This talk explains the basics of these automotive protocols, the workflow with Scapy for automotive network penetration testing. A live demonstration with some embedded hardware will be given. Y1 - 2019 UR - https://www.youtube.com/watch?v=7D7uNqPWrXw UR - https://troopers.de/downloads/troopers19/TROOPERS19_NGI_RT_Automotive_PenTesting_with_Scapy.zip ER - TY - GEN A1 - Mauerer, Wolfgang A1 - Wagner, Daniel T1 - Cyclic Tests Unleashed: Large-Scale RT Analysis with Jitterdebugger T2 - Open Source Summit Japan (Tokio) and OSSNA 17.07.2019 Y1 - 2019 UR - https://events19.linuxfoundation.org/wp-content/uploads/2018/07/talk.pdf ER - TY - CHAP A1 - Selgrad, Kai A1 - Lier, Alexander A1 - Köferl, Franz A1 - Stamminger, Marc A1 - Lohmann, Daniel ED - Kästner, Christian ED - Gokhālé, Anirüddhā T1 - Lightweight, Generative Variant Exploration for High-performance Graphics Applications T2 - GPCE'15 : Proceedings of the 2015 ACM SIGPLAN International Conference on Generative Programming: Concepts and Experiences ; October 26-27, 2015, Pittsburgh, PA, USA N2 - Rendering performance is an everlasting goal of computer graphics and significant driver for advances in both, hardware architecture and algorithms. Thereby, it has become possible to apply advanced computer graphics technology even in low-cost embedded appliances, such as car instruments. Yet, to come up with an efficient implementation, developers have to put enormous efforts into hardware/problem-specific tailoring, fine-tuning, and domain exploration, which requires profound expert knowledge. If a good solution has been found, there is a high probability that it does not work as well with other architectures or even the next hardware generation. Generative DSL-based approaches could mitigate these efforts and provide for an efficient exploration of algorithmic variants and hardware-specific tuning ideas. However, in vertically organized industries, such as automotive, suppliers are reluctant to introduce these techniques as they fear loss of control, high introduction costs, and additional constraints imposed by the OEM with respect to software and tool-chain certification. Moreover, suppliers do not want to share their generic solutions with the OEM, but only concrete instances. To this end, we propose a light-weight and incremental approach for meta programming of graphics applications. Our approach relies on an existing formulation of C-like languages that is amenable to meta programming, which we extend to become a lightweight language to combine algorithmic features. Our method provides a concise notation for meta programs and generates easily sharable output in the appropriate C-style target language. KW - exploratory programming KW - general purpose code generation KW - prototyping KW - ray tracin Y1 - 2015 UR - https://selgrad.org/publications/2015_gpce_SLKSL.pdf SN - 978-1-4503-3687-1 SP - 141 EP - 150 PB - ACM CY - New York, USA ER - TY - CHAP A1 - Lier, Alexander A1 - Martinek, Magdalena A1 - Stamminger, Marc A1 - Selgrad, Kai T1 - A High-Resolution Compression Scheme for Ray Tracing Subdivision Surfaces with Displacement T2 - Proceedings of the ACM on Computer Graphics and Interactive Techniques N2 - Subdivision surfaces, especially with displacement, are one of the key modeling primitives used in high-quality rendering environments, such as, e.g., movie production. While their use easily maps to rasterization-based frameworks, they pose a significant challenge for ray tracing environments. This is due to the fact that incoherent access patterns require storing or caching fully tessellated and displaced meshes for efficient intersection computations. In this paper we use a two-tier hierarchy built on a scene's patches. It relies on compressed and quantized bounding volumes on the second tier to reduce the size of the BVH itself. Based on this acceleration structure, we propose a quantized, compact approximation for leaf nodes while being faithful to the underlying patch-geometry. We build on recent advances and present a system that shows competitive performance regarding run-time speed, which is close to full-resolution pre-tessellation methods as well as to previous compression approaches. Ultimately, we provide strong compression of up to a factor of 5: 1 compared to state-of-the-art methods while maintaining high geometrical fidelity surpassing similarly compact approximations and getting close to uncompressed geometry. KW - Displacement Mapping KW - omputing methodologies KW - Parametric curve and surface models KW - Production Rendering KW - ray tracing KW - Subdivision Surfaces Y1 - 2018 U6 - https://doi.org/10.1145/3233308 VL - 1 IS - 2 SP - 1 EP - 17 PB - The Association for Computers in Mathematics and Science Teaching ER - TY - JOUR A1 - Bary, Benedikt von A1 - Westner, Markus A1 - Strahringer, Susanne T1 - How decision maker's personal preferences influence the decision to backsource IT services JF - Journal of Information Technology Management (JITM) N2 - To prepare their IT landscape for future business challenges, companies are changing their IT sourcing arrangements by using selective sourcing approaches as well as multi-sourcing with more but smaller sourcing contracts. Companies therefore have to reconsider and re-evaluate their IT sourcing setup more frequently. Collecting data from 251 global experts, we empirically tested the effect of service quality, relationship quality, and switching costs on IT sourcing decisions using partial least squares (PLS) analysis. Drawing on previously conducted expert interviews, our model extends previous studies and introduces a decision maker’s sourcing preferences as a not yet examined moderator on IT sourcing decisions. This allows us to investigate the influence of the decision maker’s beliefs on the decision process. We were able to confirm the negative effect of switching costs on a decision in favor of backsourcing, however we could not find significant support for the remaining hypotheses. We further discuss potential reasons for our findings and suggest future research opportunities based on our contribution. KW - Outsourcing KW - Backsourcing KW - back-in-house KW - information technology KW - partial least squares Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-233 UR - https://jitm.ubalt.edu/XXX-3/article1.pdf VL - 30 IS - 3 SP - 1 EP - 22 ER - TY - CHAP A1 - Bock, Sebastian A1 - Weiß, Martin Georg T1 - Non-Convergence and Limit Cycles in the Adam Optimizer T2 - Proceedings of the 28th International Conference on Artificial Neural Networks, 2019, Munich, Germany, September 17-19 N2 - One of the most popular training algorithms for deep neural networks is the Adaptive Moment Estimation (Adam) introduced by Kingma and Ba. Despite its success in many applications there is no satisfactory convergence analysis: only local convergence can be shown for batch mode under some restrictions on the hyperparameters, counterexamples exist for incremental mode. Recent results show that for simple quadratic objective functions limit cycles of period 2 exist in batch mode, but only for atypical hyperparameters, and only for the algorithm without bias correction. We extend the convergence analysis to all choices of the hyperparameters for quadratic functions. This finally answers the question of convergence for Adam in batch mode to the negative. We analyze the stability of these limit cycles and relate our analysis to other results where approximate convergence was shown, but under the additional assumption of bounded gradients which does not apply to quadratic functions. The investigation heavily relies on the use of computer algebra due to the complexity of the equations. KW - Adam optimizer KW - Convergence KW - Computer algebra KW - Dynamical system KW - Limit cycle KW - Neuronales Netz KW - Maschinelles Lernen KW - Optimierungsalgorithmus KW - Konvergenz 〈Informationstechnik〉 KW - Computeralgebra Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-490 UR - https://doi.org/10.1007/978-3-030-30484-3_20 SP - 232 EP - 243 ER - TY - CHAP A1 - Strasser, Artur A1 - Westner, Markus T1 - Knowledge Transfer in IS Offshoring BT - Processes, Roles, and Success Factors T2 - Proceedings of the 19th Pacific Asia Conference on Information Systems (PACIS 2015) Singapore, July 5-9 N2 - IS offshoring research regarding knowledge transfer processes, roles involved, as well as influencing factors is characterized by its diverse and heterogeneous nature. Covering the last fifteen years of IS offshoring research, this paper provides a consolidated view of the field of study. It presents a generic knowledge transfer process consisting of four stages and five milestones. These stages are characterized and evaluated according to their relevance for knowledge transfer, the types of knowledge transferred, the main activities and methods for transfer and testing, as well as the goals pursued. Furthermore, we aggregate the diverse literature findings relating to individuals who facilitate knowledge transfer processes into a general role. We label this role “offshore coordinator” and present its core tasks and necessary skills. In addition, we identify and cluster core factors that influence success or failure of knowledge transfer. In summary, our study answers calls to discontinue with empirically derived definitions in favor of theory-based conceptualization of the IS offshoring research field with respect to knowledge transfer processes, roles, and success factors. Future studies can build on these results and examine questions with respect to particular characteristics of knowledge transfer processes and their influencing success and failure factors. KW - Offshoring KW - Knowledge transfer KW - Knowledge management KW - Information systems KW - Betriebliches Informationssystem KW - Offshoring KW - Wissensmanagement Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-835 UR - https://aisel.aisnet.org/cgi/viewcontent.cgi?article=1046&context=pacis2015 SP - 1 EP - 15 ER - TY - CHAP A1 - Bock, Sebastian A1 - Weiß, Martin Georg T1 - A Proof of Local Convergence for the Adam Optimizer T2 - Proceedings of the 2019 International Joint Conference on Neural Networks (IJCNN), 2019, Budapest, Hungary, July 14-19 N2 - Adaptive Moment Estimation (Adam) is a very popular training algorithm for deep neural networks, implemented in many machine learning frameworks. To the best of the authors knowledge no complete convergence analysis exists for Adam. The contribution of this paper is a method for the local convergence analysis in batch mode for a deterministic fixed training set, which gives necessary conditions for the hyperparameters of the Adam algorithm. Due to the local nature of the arguments the objective function can be non-convex but must be at least twice continuously differentiable. KW - Non-convex optimization KW - Adam optimizer KW - Convergence KW - Momentum method KW - Dynamical system KW - Fixed point KW - Neuronales Netz KW - Maschinelles Lernen KW - Optimierungsalgorithmus KW - Konvergenz 〈Informationstechnik〉 Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-501 UR - https://doi.org/10.1109/IJCNN.2019.8852239 VL - 2019 SP - 1 EP - 8 ER - TY - JOUR A1 - Könning, Michael A1 - Strahringer, Susanne A1 - Westner, Markus T1 - Unraveling the impact of cultural distance on IT outsourcing success BT - Insights from three major sourcing reconfigurations JF - Journal of Enterprise Information Management N2 - PURPOSE IT outsourcing (ITO) has developed into an established practice for organizations but the interorganizational and oftentimes international collaboration it involves comes at a price: Reports from academia and practice suggest that more than 25% of all ITO projects fail, many because of cultural differences between client and provider organizations. Against this background, this paper analyzes the complex nature of cultural distance and its multi-faceted effect on ITO success. DESIGN/METHODOLOGY/APPROACH This paper builds upon extant literature on culture on the national, organizational and team level, conceptualizes its effect on relationship quality and ITO success, and hypothesizes a model on potential moderators and management techniques to offset culture-induced challenges. It then evaluates and refines the model by means of an interpretive qualitative research design for an in-depth single-case study of ProSiebenSat.1 Media SE (P7S1), a leading European media company that reconfigured its IT sourcing model three times in 10 years. FINDINGS The results from interviews with top managers from client and provider organizations represent one of the first integrated views on the critical importance of cultural compatibility on multiple levels, provide manifold examples for its complex effect on ITO success, as well as moderators and potential management techniques to promote ITO success. RESEARCH LIMITATIONS/IMPLICATIONS This paper contributes relevant empirical insights to the growing body of literature on culture and its underestimated role in ITO success. It builds on tentative theory that is confirmed and refined. PRACTICAL IMPLICATIONS The paper helps in substantiating the complex and intangible nature of culture and demonstrates means for its effective management. ORIGINALITY/VALUE The results from interviews with top managers from client and provider organizations represent one of the first integrated views on the critical importance of cultural compatibility on multiple levels, provide manifold examples for its complex effect on ITO success, as well as moderators and potential management techniques to promote ITO success. KW - IT outsourcing KW - Offshoring KW - ITO Success KW - Cultural distance KW - Relationship quality KW - National culture KW - Organizational culture Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-8708 VL - 34 IS - 3 SP - 811 EP - 837 PB - Emerald ER - TY - JOUR A1 - Schönberger, Manuel A1 - Scherzinger, Stefanie A1 - Mauerer, Wolfgang T1 - Ready to Leap (by Co-Design)? Join Order Optimisation on Quantum Hardware JF - Proceedings of the ACM on Management of Data, PACMMOD N2 - The prospect of achieving computational speedups by exploiting quantum phenomena makes the use of quantum processing units (QPUs) attractive for many algorithmic database problems. Query optimisation, which concerns problems that typically need to explore large search spaces, seems like an ideal match for the known quantum algorithms. We present the first quantum implementation of join ordering, which is one of the most investigated and fundamental query optimisation problems, based on a reformulation to quadratic binary unconstrained optimisation problems. We empirically characterise our method on two state-of-the-art approaches (gate-based quantum computing and quantum annealing), and identify speed-ups compared to the best know classical join ordering approaches for input sizes that can be processed with current quantum annealers. However, we also confirm that limits of early-stage technology are quickly reached. Current QPUs are classified as noisy, intermediate scale quantum computers (NISQ), and are restricted by a variety of limitations that reduce their capabilities as compared to ideal future quantum computers, which prevents us from scaling up problem dimensions and reaching practical utility. To overcome these challenges, our formulation accounts for specific QPU properties and limitations, and allows us to trade between achievable solution quality and possible problem size. In contrast to all prior work on quantum computing for query optimisation and database-related challenges, we go beyond currently available QPUs, and explicitly target the scalability limitations: Using insights gained from numerical simulations and our experimental analysis, we identify key criteria for co-designing QPUs to improve their usefulness for join ordering, and show how even relatively minor physical architectural improvements can result in substantial enhancements. Finally, we outline a path towards practical utility of custom-designed QPUs. KW - Hardware KW - Quantum cmputation KW - Informations systems KW - Join algorithms Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-56634 N1 - Corresponding author: Manuel Schönberger VL - 1 IS - 1 SP - 1 EP - 27 PB - ACM CY - New York, NY, ER -