@inproceedings{FolgerHachaniFuxenetal., author = {Folger, Fabian and Hachani, Murad and Fuxen, Philipp and Graf, Julian and Fischer, Sebastian and Hackenberg, Rudolf}, title = {A Transformer-Based Framework for Anomaly Detection in Multivariate Time Series}, series = {CLOUD COMPUTING 2025, The Sixteenth International Conference on Cloud Computing, GRIDs, and Virtualization, April 06, 2025 to April 10, 2025, Valencia, Spain}, booktitle = {CLOUD COMPUTING 2025, The Sixteenth International Conference on Cloud Computing, GRIDs, and Virtualization, April 06, 2025 to April 10, 2025, Valencia, Spain}, publisher = {IARIA}, isbn = {978-1-68558-258-6}, issn = {2308-4294}, pages = {52 -- 57}, abstract = {This paper introduces a comprehensive Transformer-based architecture for anomaly detection in multivariate time series. Using self-attention, the framework efficiently processes high-dimensional sensor data without extensive feature engineering, enabling early detection of unusual patterns to prevent critical system failures. In a subsequent laboratory setup, the framework will be applied using fuzzing techniques to induce anomalies in an Electronic Control Unit, while monitoring side channels, such as temperature, voltage, and Controller Area Network messages. The overall structure of the architecture, as well as the necessary preprocessing steps, such as temporal aggregation and classification up to the optimization of the hyperparameters of the model, are presented. The evaluation of the model architecture with the postulated restrictions shows that the model handles anomaly scenarios in the dataset robustly. It is necessary to evaluate the extent to which the model can be used in practical applications in areas, such as cloud environments or the industrial Internet of Things. Overall, the results highlight the potential of Transformer models for the automated and reliable monitoring of complex time series data for deviations.}, language = {en} } @article{DahmenBogenbergerWeikl, author = {Dahmen, Victoria and Bogenberger, Klaus and Weikl, Simone}, title = {Modellierung des Verkehrsmittelwahlverhaltens mittels erkl{\"a}rbarem Maschinellem Lernen}, series = {Straßenverkehrstechnik}, volume = {69}, journal = {Straßenverkehrstechnik}, number = {2}, publisher = {Kirschbaum}, issn = {0039-2219}, doi = {10.53184/SVT2-2025-3}, pages = {96 -- 102}, abstract = {Die Modellierung der Verkehrsmittelwahl ist f{\"u}r die Vorhersage und das Verst{\"a}ndnis des Mobilit{\"a}tsverhaltens unerl{\"a}sslich. Hierbei wurden in den letzten Jahren mit maschinellem Lernen vielversprechende Ergebnisse erzielt, insbesondere f{\"u}r XGBoost- und Random-Forest-Modelle. Aufgrund der zunehmenden Verwendung von Tracking-basierten Smartphone-Apps zur Aufzeichnung des Mobilit{\"a}tsverhaltens, wenden wir diese Modelle auf einen solchen Datensatz an. Zudem analysieren wir eingehend deren Interpretierbarkeit. Wir kommen zu dem Schluss, dass das XGBoost-Modell am leistungsst{\"a}rksten und dennoch erkl{\"a}rbar ist. Die von solchen Modellen gewonnenen Erkenntnisse k{\"o}nnen beispielsweise genutzt werden, um die Verkehrsmittelwahl f{\"u}r beliebige Quelle-Ziel-Paare vorherzusagen.}, language = {de} } @article{VetterHaugWeber, author = {Vetter, Miriam and Haug, Sonja and Weber, Karsten}, title = {Datenschutzsorgen aus Sicht der Bev{\"o}lkerung im Kontext der Einf{\"u}hrung von Smart-Metern}, series = {Datensicherheit und Datenschutz}, volume = {49}, journal = {Datensicherheit und Datenschutz}, number = {3}, publisher = {Springer Nature}, doi = {10.1007/s11623-025-2065-8}, pages = {177 -- 180}, abstract = {Der Beitrag stellt die Ergebnisse einer repr{\"a}sentativen Bev{\"o}lkerungsumfrage zur Akzeptanz von Smart-Metern in Privathaushalten vor. Bedenken gegen{\"u}ber der Einf{\"u}hrung von Smart-Metern hat knapp die H{\"a}lfte der Befragten. Anonymisierte Zugriffe auf ERnergieverbrauchsdaten werden anstelle der Weitergabe personenbezogener Daten favorisiert. Informationen {\"u}ber den Datenschutz haben f{\"u}r deutsche Privathaushalte offenbar die h{\"o}chste Priorit{\"a}t.}, language = {de} } @misc{OPUS4-8066, title = {CLOUD COMPUTING 2025, The Sixteenth International Conference on Cloud Computing, GRIDs, and Virtualization, April 06, 2025 to April 10, 2025, Valencia, Spain}, editor = {Fischer, Sebastian and Neumann, Christoph P. and Aßmuth, Andreas}, publisher = {IARIA}, isbn = {978-1-68558-258-6}, issn = {2308-4294}, language = {en} } @misc{OPUS4-7892, title = {Proceedings of the 14th International Conference on Advances in System Simulation, SIMUL 2022, October 16 - 20, 2022, Lisbon, Portugal}, editor = {Herrmann, Frank}, publisher = {IARIA XPS Press}, isbn = {978-1-68558-001-8}, issn = {2308-4537}, pages = {85}, language = {en} } @incollection{Weber, author = {Weber, Karsten}, title = {K{\"u}nstliche Intelligenz und Sterben just in time}, series = {Wie werden wir in Zukunft sterben? - Szenarien zu Sterben Tod und Trauer im Jahr 2045}, booktitle = {Wie werden wir in Zukunft sterben? - Szenarien zu Sterben Tod und Trauer im Jahr 2045}, editor = {George, Wolfgang Michael and Weber, Karsten}, publisher = {Psychosozial-Verlag}, address = {Gießen}, isbn = {9783837961058}, doi = {10.30820/9783837961058-249}, pages = {249 -- 268}, language = {de} } @incollection{Weber, author = {Weber, Karsten}, title = {Mensch und Technik, Mensch durch Technik}, series = {Wie werden wir in Zukunft sterben? - Szenarien zu Sterben Tod und Trauer im Jahr 2045}, booktitle = {Wie werden wir in Zukunft sterben? - Szenarien zu Sterben Tod und Trauer im Jahr 2045}, editor = {George, Wolfgang Michael and Weber, Karsten}, publisher = {Psychosozial-Verlag}, address = {Gießen}, isbn = {9783837961058}, doi = {10.30820/9783837961058-49}, pages = {49 -- 60}, language = {de} } @inproceedings{FuxenHackenbergHeinletal., author = {Fuxen, Philipp and Hackenberg, Rudolf and Heinl, M. P. and Schunck, C. H. and Yahalom, R.}, title = {MANTRA: A Graph-based Unified Information Aggregation Foundation for Enhancing Cybersecurity Management in Critical Infrastructures // Aufsatznr.: P-335}, series = {Lecture Notes in Informatics (LNI), Proceedings - Series of the Gesellschaft fur Informatik (GI),}, booktitle = {Lecture Notes in Informatics (LNI), Proceedings - Series of the Gesellschaft fur Informatik (GI),}, doi = {10.18420/OID2023_10}, pages = {123 -- 128}, abstract = {The digitization of almost all sectors of life and the quickly growing complexity of interrelationships between actors in this digital world leads to a dramatically increasing attack surface regarding both direct and also indirect attacks over the supply chain. These supply chain attacks can have different characters, e.g., vulnerabilities and backdoors in hardware and software, illegitimate access by compromised service providers, or trust relationships to suppliers and customers exploited in the course of business email compromise. To address this challenge and create visibility along these supply chains, threat-related data needs to be rapidly exchanged and correlated over organizational borders. The publicly funded project MANTRA is meant to create a secure and resilient framework for real-time exchange of cyberattack patterns and automated, contextualized risk management. The novel graph-based approach provides benefits for automation regarding cybersecurity management, especially when it comes to prioriization of measures for risk reduction and during active defense against cyberattacks. In this paper, we outline MANTRA's scope, objectives, envisioned scientific approach, and challenges.}, language = {en} } @misc{Fischer, author = {Fischer, Sebastian}, title = {A Security-, Privacy-and Usability-Scoring System for IoT Devices}, language = {en} } @inproceedings{HachaniSteyFuxenetal., author = {Hachani, Murad and Stey, Miguel and Fuxen, Philipp and Graf, Julian and Hackenberg, Rudolf}, title = {GFDG: a genetic fuzzing method for the Controller Area Network Protocol}, series = {Cloud Computing 2025 : The Sixteenth International Conference on Cloud Coud Computing, GRIDs, and Virtualization, 06.-10. April 2025, Valencia}, booktitle = {Cloud Computing 2025 : The Sixteenth International Conference on Cloud Coud Computing, GRIDs, and Virtualization, 06.-10. April 2025, Valencia}, organization = {IARIA}, isbn = {978-1-68558-258-6}, issn = {2308-4294}, pages = {40 -- 45}, abstract = {Ensuring the security of modern automotive systems is critical due to their increasing complexity and reliance on interconnected Electronic Control Units. The Controller Area Network still serves as a key communication protocol within these systems, making it a primary target for security testing. Traditional fuzz testing approaches for Controller Area Networks often rely on random or brute-force message generation, not leveraging the system's feedback to improve the generation process. This paper introduces the Genetic Fuzz Data Generator, a fuzzing method that leverages Genetic Algorithms and side-channel analysis to enhance Controller Area Network security testing. The Genetic Fuzz Data Generator dynamically refines its fuzzing strategy by evaluating system responses through side-channel data, such as processing unit temperatures and power supply variations. By structuring Controller Area Network messages as genetic individuals and applying evolutionary principles—including selection, crossover, and mutation—the Genetic Fuzz Data Generator systematically identifies active Controller Area Network IDs and generates targeted fuzz messages. Experimental validation was conducted on a real automotive electronic control unit within a controlled laboratory setup. The first results demonstrated the approach's effectiveness, revealing system anomalies, including a Denial of Service vulnerability that disrupted functions of the investigated Electronic Control Unit. The findings highlight the potential of feedback-driven fuzzing for improving the efficiency of black-box security testing in Controller Area Network-based systems. Future research could further optimize fitness functions or explore additional side-channel metrics.}, language = {en} } @inproceedings{BuchmannSchwaegerlPeinl, author = {Buchmann, Thomas and Schw{\"a}gerl, Felix and Peinl, Ren{\´e}}, title = {To Model, to Prompt, or to Code? The Choice Is Yours: A Multi-Paradigmatic Approach to Software Development}, series = {Proceedings of the 20th International Conference on Software Technologies, 10-12.Juni 2025, Bilbao}, booktitle = {Proceedings of the 20th International Conference on Software Technologies, 10-12.Juni 2025, Bilbao}, publisher = {SCITEPRESS - Science and Technology Publications}, doi = {10.5220/0013557100003964}, pages = {296 -- 303}, abstract = {This paper considers three fundamental approaches to software development, namely manual coding, model-driven software engineering, and code generation by large language models. All of these approaches have their individual pros and cons, motivating the desire for an integrated approach. We present MoProCo, a technical solution to integrate the three approaches into a single tool chain, allowing the developer to split a software engineering task into modeling, prompting or coding sub-tasks. From a single input file consisting of static model structure, natural language prompts and/or source code fragments, Java source code is generated using a two-stage approach. A case study demonstrates that the MoProCo approach combines the desirable properties of the three development approaches by offering the appropriate level of abstraction, determinism, and dynamism for each specific software engineering sub-task.}, language = {en} } @inproceedings{ReichelGerstnerSchilleretal., author = {Reichel, Tobias and Gerstner, Mathias and Schiller, Leo and Attenberger, Andreas and Hackenberg, Rudolf and Dološ, Klara}, title = {A forensic analysis of GNSS spoofing attacks on autonomous vehicles}, series = {Cloud Computing 2025 : The Sixteenth International Conference on Cloud Computing, GRIDs, and Virtualization, 06.-10. April 2025, Valencia}, booktitle = {Cloud Computing 2025 : The Sixteenth International Conference on Cloud Computing, GRIDs, and Virtualization, 06.-10. April 2025, Valencia}, organization = {IARIA}, isbn = {978-1-68558-258-6}, issn = {2308-4294}, pages = {32 -- 39}, abstract = {Global Navigation Satellite Systems (GNSSs) are essential for modern technology, enabling precise geographic positioning in aviation, maritime shipping, and automotive systems. In the future, their role will be even more critical for autonomous vehicles, which rely on accurate localization for navigation and decision-making. However, the increasing connectivity of autonomous vehicles exposes them to cyber threats, including GNSS spoofing attacks, which manipulate location data to mislead onboard systems. As reliance on GNSS grows, so does the risk posed by spoofing attacks, making it a critical security concern. This paper describes GNSS spoofing attacks on autonomous vehicles, focusing on their detection both during and after an attack. Furthermore, we analyze data storage strategies to facilitate effective forensic analysis. We highlight the importance of position, signal, and camera data, which should be preserved to ensure a comprehensive forensic investigation. Finally, we suggest a simulation setup that enables studying which data could be used for a forensic investigation. Additionally, we examine established data frameworks and decide whether they are suitable for detecting GNSS spoofing attacks.}, language = {en} } @misc{Altweck, type = {Master Thesis}, author = {Altweck, Ricardo}, title = {Analysing Learning Behaviour in Moodle: A Heuristic and AI-Driven Approach}, address = {Regensburg}, doi = {10.35096/othr/pub-7921}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-79210}, school = {Ostbayerische Technische Hochschule Regensburg}, pages = {91}, abstract = {In this thesis, a novel evaluation method to determine the duration of learning sessions and the completion of learning material is introduced. Screen recordings of students' browser sessions are utilised to capture detailed, low-level learner activity in a blended learning environment.The accumulated recordings are analysed to define a continuous completion state for individual learning material, focusing on the exact time a student spends on the material and their activity during this period. The evaluation method is adapted to the type of material, such as PDF documents, quizzes, or video lectures. The results demonstrate the potential of this approach, based on analysis of two distinct time frames: an exam preparation period and a lecture period. Additionally, an AI-driven approach is outlined to further refine the chosen definition of learning material completion.}, language = {en} } @article{KopperFuerstenauZimmermannetal., author = {Kopper, Andreas and F{\"u}rstenau, Daniel and Zimmermann, Stephan and Klotz, Stefan and Rentrop, Christopher and Rothe, Hannes and Strahringer, Susanne and Westner, Markus}, title = {Shadow IT and Business-Managed IT: A Conceptual Framework and Empirical Illustration}, series = {International Journal of IT/Business Alignment and Governance (IJITBAG)}, volume = {9}, journal = {International Journal of IT/Business Alignment and Governance (IJITBAG)}, number = {2}, publisher = {IGI Global}, doi = {10.4018/IJITBAG.2018070104}, pages = {53 -- 71}, abstract = {Research on Shadow IT is facing a conceptual dilemma in cases where previously "covert" systems developed by business entities are integrated in the organizational IT management. These systems become visible, are thus not "in the shadows" anymore, and subsequently do not fit to existing definitions of Shadow IT. Practice shows that some information systems share characteristics of Shadow IT but are created openly in alignment with the IT organization. This paper proposes the term "Business-managed IT" to describe "overt" information systems developed or managed by business entities and distinguishes it from Shadow IT by illustrating case vignettes. Accordingly,our contribution is to suggest a concept and its delineation against other concepts. In this way, IS researchers interested in IT originated from or maintained by business entities can construct theories with a wider scope of application that are at the same time more specific to practical problems. In addition, the terminology allows to value potentially innovative developments by business entities more adequately.}, subject = {Unternehmen}, language = {en} } @article{KaessStrahringerWestner, author = {K{\"a}ss, Sebastian and Strahringer, Susanne and Westner, Markus}, title = {A Multiple Mini Case Study on the Adoption of Low Code Development Platforms in Work Systems}, series = {IEEE Access}, journal = {IEEE Access}, publisher = {IEEE}, issn = {2169-3536}, doi = {10.1109/ACCESS.2023.3325092}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-65634}, pages = {118762 -- 118786}, abstract = {Although adopting Low Code Development Platforms (LCDPs) promises significant efficiency and effectiveness improvements for application development, its adoption still needs further empirical research. This paper uses a combinatorial approach to research LCDP adoption and presents the results of a multiple mini case study with 36 cases on LCDP adoption. A combination of the Socio-Technical Systems theory and the Technology-Organisational-Environment model is used as a theoretical lens. In this paper, we show that LCDP adoption is a multifaceted phenomenon and identify three archetypes for LCDP adoption (i.e., IT Resource Shortage Mitigators, Application Development Democratisers, and Synergy Realisers) and one archetype for LCDP non-adoption (i.e., Intricacy Adversaries). Each archetype can be interpreted as an individual path towards LCDP (non-)adoption. Based on these archetypes, we derive seven starting points for practitioners to adopt LCDPs in work systems. Moreover, by using the theoretical lenses, the paper shows that for an LCDP adoption to occur, an optimisation of the social and technical sub-systems is required.}, language = {en} } @article{BorgFrikelJorgensenetal., author = {Borg, Leise and Frikel, J{\"u}rgen and J{\o}rgensen, Jakob Sauer and Quinto, Eric Todd}, title = {Analyzing Reconstruction Artifacts from Arbitrary Incomplete X-ray CT Data}, series = {SIAM Journal on Imaging Sciences}, volume = {11}, journal = {SIAM Journal on Imaging Sciences}, number = {4}, publisher = {SIAM PUBLICATIONS}, doi = {10.1137/18M1166833}, pages = {2786 -- 2814}, abstract = {This article provides a mathematical analysis of singular (nonsmooth) artifacts added to reconstructions by filtered backprojection (FBP) type algorithms for X-ray computed tomography (CT) with arbitrary incomplete data. We prove that these singular artifacts arise from points at the boundary of the data set. Our results show that, depending on the geometry of this boundary, two types of artifacts can arise: object-dependent and object-independent artifacts. Object-dependent artifacts are generated by singularities of the object being scanned, and these artifacts can extend along lines. They generalize the streak artifacts observed in limited-angle tomography. Object-independent artifacts, on the other hand, are essentially independent of the object and take one of two forms: streaks on lines if the boundary of the data set is not smooth at a point and curved artifacts if the boundary is smooth locally. We prove that these streak and curve artifacts are the only singular artifacts that can occur for FBP in the continuous case. In addition to the geometric description of artifacts, the article provides characterizations of their strength in Sobolev scale in certain cases. The results of this article apply to the well-known incomplete data problems, including limited-angle and regionof-interest tomography, as well as to unconventional X-ray CT imaging setups that arise in new practical applications. Reconstructions from simulated and real data are analyzed to illustrate our theorems, including the reconstruction that motivated this work a synchrotron data set in which artifacts appear on lines that have no relation to the object.}, language = {en} } @article{KopperKlotzWestneretal., author = {Kopper, Andreas and Klotz, Stefan and Westner, Markus and Strahringer, Susanne}, title = {Shadow IT and Business-managed IT}, series = {Journal of Information Technology Management (JITM)}, volume = {30}, journal = {Journal of Information Technology Management (JITM)}, number = {4}, issn = {1042-1319}, pages = {25}, abstract = {Two concepts describe the autonomous deployment of IT by business entities: Shadow IT and Business-managed IT. Shadow IT is deployed covertly, that is, software, hardware, or IT services created/procured or managed by business entities without alignment with the IT organization. In contrast, Business-managed IT describes the overt deployment of IT, that is, in alignment with the IT organization or in a split responsibility model. The purpose of this paper is to extend the conceptual understanding of Shadow IT and Business-managed IT, comparing the perceptions of 29 CIOs and senior IT managers with the results of a systematic literature review. By doing so, this paper presents a structured and comprehensive view of causing factors, outcomes, and governance of Shadow IT and Business-managed IT in practice. A comparison of academic literature and practitioner perceptions reveals the limitations and gaps of the current research and highlights avenues for future research. The authors find three category-spanning themes occurring as causing factors, outcomes, and—as part of governance measures—factors to improve the IT organization: (1) (Poor) business-IT alignment (2) (lack of) agility, and (3) (lack of) policies. This study is innovative with its comprehensive qualitative interview data that the authors compare to the existing literature. Therefore, the paper brings together theoretical and practical insights into Shadow IT and Businessmanaged IT, which should aid practitioners and scholars in decision making and future research.}, subject = {Corporate Governance}, language = {en} } @article{KaessBrosigWestneretal., author = {K{\"a}ss, Sebastian and Brosig, Christoph and Westner, Markus and Strahringer, Susanne}, title = {Short and sweet: multiple mini case studies as a form of rigorous case study research}, series = {Information Systems and e-Business Management}, journal = {Information Systems and e-Business Management}, publisher = {Springer Nature}, doi = {10.1007/s10257-024-00674-2}, pages = {34}, abstract = {Case study research is one of the most widely used research methods in Information Systems (IS). In recent years, an increasing number of publications have used case studies with few sources of evidence, such as single interviews per case. While there is much methodological guidance on rigorously conducting multiple case studies, it remains unclear how researchers can achieve an acceptable level of rigour for this emerging type of multiple case study with few sources of evidence, i.e., multiple mini case studies. In this context, we synthesise methodological guidance for multiple case study research from a cross-disciplinary perspective to develop an analytical framework. Furthermore, we calibrate this analytical framework to multiple mini case studies by reviewing previous IS publications that use multiple mini case studies to provide guidelines to conduct multiple mini case studies rigorously. We also offer a conceptual definition of multiple mini case studies, distinguish them from other research approaches, and position multiple mini case studies as a pragmatic and rigorous approach to research emerging and innovative phenomena in IS.}, language = {en} } @article{KlotzKopperWestneretal., author = {Klotz, Stefan and Kopper, Andreas and Westner, Markus and Strahringer, Susanne}, title = {Von Schatten-IT zu Business-managed IT: Fachbereichs-IT gezielt gestalten}, series = {Wirtschaftsinformatik \& Management}, volume = {14}, journal = {Wirtschaftsinformatik \& Management}, number = {4}, publisher = {Springer Nature}, issn = {1867-5913}, doi = {10.1365/s35764-022-00421-7}, pages = {282 -- 287}, abstract = {Fachbereichs-IT, Schatten-IT, Business-managed IT. All diese Begriffe beschreiben IT, die neben den eigentlichen, regul{\"a}ren IT-Systemen oder -Prozessen in Unternehmen existieren und von Mitarbeiterinnen und Mitarbeitern der Fachbereiche genutzt werden. Im Fall von„Schatten-IT" handelt es sich um IT-Systeme und -Prozesse (IT-Instanzen), die sich ohne Kenntnis der IT-Verantwortlichen etabliert haben; im Fall von„Business-managed IT" entstehen die IT-Systeme und -Prozesse in Kenntnis der bzw. in Abstimmung mit den IT-Verantwortlichen im Unternehmen.„Fachbereichs-IT" subsumiert Schatten-IT und Business-managed IT. Welche Ursachen f{\"u}hren zu solchen IT-Instanzen, welche Potenziale und Risiken haben diese IT-Instanzen und wie lassen sie sich steuern?}, language = {de} } @inproceedings{JoblinApelHunsenetal., author = {Joblin, Mitchell and Apel, Sven and Hunsen, Claus and Mauerer, Wolfgang}, title = {Classifying Developers into Core and Peripheral: An Empirical Study on Count and Network Metrics}, series = {2017 IEEE/ACM 39th International Conference on Software Engineering (ICSE), Buenos Aires, Argentina, 20-28 May 2017}, booktitle = {2017 IEEE/ACM 39th International Conference on Software Engineering (ICSE), Buenos Aires, Argentina, 20-28 May 2017}, publisher = {IEEE}, doi = {10.1109/icse.2017.23}, pages = {164 -- 174}, abstract = {Knowledge about the roles developers play in a software project is crucial to understanding the project's collaborative dynamics. In practice, developers are often classified according to the dichotomy of core and peripheral roles. Typically, count-based operationalizations, which rely on simple counts of individual developer activities (e.g., number of commits), are used for this purpose, but there is concern regarding their validity and ability to elicit meaningful insights. To shed light on this issue, we investigate whether count-based operationalizations of developer roles produce consistent results, and we validate them with respect to developers' perceptions by surveying 166 developers. Improving over the state of the art, we propose a relational perspective on developer roles, using fine-grained developer networks modeling the organizational structure, and by examining developer roles in terms of developers' positions and stability within the developer network. In a study of 10 substantial open-source projects, we found that the primary difference between the count-based and our proposed network-based core-peripheral operationalizations is that the network-based ones agree more with developer perception than count-based ones. Furthermore, we demonstrate that a relational perspective can reveal further meaningful insights, such as that core developers exhibit high positional stability, upper positions in the hierarchy, and high levels of coordination with other core developers, which confirms assumptions of previous work.}, language = {en} } @inproceedings{KlotzWestnerStrahringer, author = {Klotz, Stefan and Westner, Markus and Strahringer, Susanne}, title = {From Shadow IT to Business-managed IT and Back Again}, series = {Pacific Asia Conference on Information Systems (PACIS): 2020, Dubai}, booktitle = {Pacific Asia Conference on Information Systems (PACIS): 2020, Dubai}, pages = {14}, abstract = {Today, information technology (IT) is not anymore solely deployed and maintained by the IT organization, but also by business units. IT deployed or managed by business units is called Shadow IT (without alignment with the IT organization) or Business-managed IT (in alignment or a split responsibility model with the IT organization), contrasting "classical" IT. However, the responsibility for deployed IT might change over time. Therefore, this paper conceptualizes the progression of the responsibility for IT as a trajectory through initialization, potential transitions, and discontinuance. The paper illustrates this conceptual framework using four exemplary case vignettes of IT instances. Empirical findings of the case vignettes determine indications when employees initialize an IT instance as Shadow IT, Business-managed IT, or IT-managed systems and reasons why the responsibility for an IT instance changes over time. The results suggest that scholars and practitioners should add a temporal dimension to the governance of IT instances.}, subject = {IT-Governance}, language = {en} } @article{KlotzKopperWestneretal., author = {Klotz, Stefan and Kopper, Andreas and Westner, Markus and Strahringer, Susanne}, title = {Causing factors, outcomes, and governance of Shadow IT and business-managed IT}, series = {International Journal of Information Systems and Project Management}, volume = {7}, journal = {International Journal of Information Systems and Project Management}, number = {1}, issn = {2182-7796}, doi = {10.12821/ijispm070102}, pages = {15 -- 43}, abstract = {Shadow IT and Business-managed IT describe the autonomous deployment/procurement or management of Information Technology (IT) instances, i.e., software, hardware, or IT services, by business entities. For Shadow IT, this happens covertly, i.e., without alignment with the IT organization; for Business-managed IT this happens overtly, i.e., in alignment with the IT organization or in a split responsibility model. We conduct a systematic literature review and structure the identified research themes in a framework of causing factors, outcomes, and governance. As causing factors, we identify enablers, motivators, and missing barriers. Outcomes can be benefits as well as risks/shortcomings of Shadow IT and Business-managed IT. Concerning governance, we distinguish two subcategories: general governance for Shadow IT and Business-managed IT and instance governance for overt Business-managed IT. Thus, a specific set of governance approaches exists for Business-managed IT that cannot be applied to Shadow IT due to its covert nature. Hence, we extend the existing conceptual understanding and allocate research themes to Shadow IT, Business-managed IT, or both concepts and particularly distinguish the governance of the two concepts. Besides, we find that governance themes have been the primary research focus since 2016, whereas older publications (until 2015) focused on causing factors.}, subject = {Betriebliches Informationssystem}, language = {en} } @article{KlotzWestnerStrahringer, author = {Klotz, Stefan and Westner, Markus and Strahringer, Susanne}, title = {Critical Success Factors of Business-managed IT: It Takes Two to Tango}, series = {Information Systems Management}, volume = {39}, journal = {Information Systems Management}, number = {3}, publisher = {Taylor\&Francis}, doi = {10.1080/10580530.2021.1938300}, pages = {220 -- 240}, abstract = {This paper identifies critical success factors of Business-managed IT based on case study results. Four groups of critical success factors emerge: (1) general approach to Business-managed IT/Business-managed IT strategy, (2) Business-managed IT project prerequisites/Business-managed IT team, (3) Business-managed IT project execution and outcome, and (4) information technology management for Business-managed IT. The results suggest that bilateral responsibility between the business unit and the IT organization is the most favorable governance option for Business-managed IT.}, subject = {Betriebliches Informationssystem}, language = {en} } @article{BorgJorgensenFrikeletal., author = {Borg, Leise and J{\o}rgensen, Jakob Sauer and Frikel, J{\"u}rgen and Sporring, Jon}, title = {Reduction of variable-truncation artifacts from beam occlusion during in situ x-ray tomography}, series = {Measurement Science and Technology}, volume = {28}, journal = {Measurement Science and Technology}, number = {12}, publisher = {IOP Publishing}, doi = {10.1088/1361-6501/aa8c27}, abstract = {Many in situ x-ray tomography studies require experimental rigs which may partially occlude the beam and cause parts of the projection data to be missing. In a study of fluid flow in porous chalk using a percolation cell with four metal bars drastic streak artifacts arise in the filtered backprojection (FBP) reconstruction at certain orientations. Projections with non-trivial variable truncation caused by the metal bars are the source of these variable-truncation artifacts. To understand the artifacts a mathematical model of variable-truncation data as a function of metal bar radius and distance to sample is derived and verified numerically and with experimental data. The model accurately describes the arising variable-truncation artifacts across simulated variations of the experimental setup. Three variable-truncation artifact-reduction methods are proposed, all aimed at addressing sinogram discontinuities that are shown to be the source of the streaks. The 'reduction to limited angle' (RLA) method simply keeps only non-truncated projections; the 'detector-directed smoothing' (DDS) method smooths the discontinuities; while the 'reflexive boundary condition' (RBC) method enforces a zero derivative at the discontinuities. Experimental results using both simulated and real data show that the proposed methods effectively reduce variable- truncation artifacts. The RBC method is found to provide the best artifact reduction and preservation of image features using both visual and quantitative assessment. The analysis and artifact-reduction methods are designed in context of FBP reconstruction motivated by computational efficiency practical for large, real synchrotron data. While a specific variable- truncation case is considered, the proposed methods can be applied to general data cut-offs arising in different in situ x-ray tomography experiments.}, language = {en} } @inproceedings{JoblinMauererApeletal., author = {Joblin, Mitchell and Mauerer, Wolfgang and Apel, Sven and Siegmund, Janet and Riehle, Dirk}, title = {From Developer Networks to Verified Communities: A Fine-Grained Approach}, series = {2015 IEEE/ACM 37th IEEE International Conference on Software Engineering, 16-24 May 2015, Florence, Italy}, booktitle = {2015 IEEE/ACM 37th IEEE International Conference on Software Engineering, 16-24 May 2015, Florence, Italy}, publisher = {IEEE}, isbn = {978-1-4799-1934-5}, doi = {10.1109/icse.2015.73}, pages = {563 -- 573}, abstract = {Effective software engineering demands a coordinated effort. Unfortunately, a comprehensive view on developer coordination is rarely available to support software-engineering decisions, despite the significant implications on software quality, software architecture, and developer productivity. We present a fine-grained, verifiable, and fully automated approach to capture a view on developer coordination, based on commit information and source-code structure, mined from version-control systems. We apply methodology from network analysis and machine learning to identify developer communities automatically. Compared to previous work, our approach is fine-grained, and identifies statistically significant communities using order-statistics and a community-verification technique based on graph conductance. To demonstrate the scalability and generality of our approach, we analyze ten open-source projects with complex and active histories, written in various programming languages. By surveying 53 open-source developers from the ten projects, we validate the authenticity of inferred community structure with respect to reality. Our results indicate that developers of open-source projects form statistically significant community structures and this particular view on collaboration largely coincides with developers' perceptions of real-world collaboration.}, language = {en} } @inproceedings{KlotzWestnerStrahringeretal., author = {Klotz, Stefan and Westner, Markus and Strahringer, Susanne and Schieder, Christian}, title = {Transformed Knowledge Sharing Through Business-managed IT and Shadow IT}, series = {Proceedings of the 25th Americas Conference on Information Systems (AMCIS 2019), Canc{\´u}n, Mexiko, August 15-17}, booktitle = {Proceedings of the 25th Americas Conference on Information Systems (AMCIS 2019), Canc{\´u}n, Mexiko, August 15-17}, publisher = {AIS}, pages = {1 -- 10}, abstract = {Business-managed IT and Shadow IT describe the autonomous deployment/management of IT instances by business units. For the former, this happens in alignment with the IT organization of the enterprise, for the latter, without alignment. We analyze why and how Business-managed IT and Shadow IT transform knowledge sharing with two case studies drawing on the theoretical lens of the knowledge-based view. Several motivators lead to the autonomous implementation of knowledge management systems (KMSs), for example, shortcomings of existing systems. The implemented KMSs have multiple benefits for knowledge sharing, such as a reduction of knowledge sharing barriers. However, we notice that the Shadow IT KMS leads to challenges for cross-unit knowledge sharing due to the covert nature of Shadow IT. Based on the findings of our case studies, we develop a mid-range theory to explain the transformation of knowledge sharing in enterprises supported by Business-managed IT and Shadow IT.}, language = {en} } @article{JoblinApelMauerer, author = {Joblin, Mitchell and Apel, Sven and Mauerer, Wolfgang}, title = {Evolutionary trends of developer coordination: a network approach}, series = {Empirical Software Engineering}, volume = {22}, journal = {Empirical Software Engineering}, number = {4}, publisher = {Springer}, doi = {10.1007/s10664-016-9478-9}, pages = {2050 -- 2094}, abstract = {Software evolution is a fundamental process that transcends the realm of technical artifacts and permeates the entire organizational structure of a software project. By means of a longitudinal empirical study of 18 large open-source projects, we examine and discuss the evolutionary principles that govern the coordination of developers. By applying a network-analytic approach, we found that the implicit and self-organizing structure of developer coordination is ubiquitously described by non-random organizational principles that defy conventional software-engineering wisdom. In particular, we found that: (a) developers form scale-free networks, in which the majority of coordination requirements arise among an extremely small number of developers, (b) developers tend to accumulate coordination requirements with more and more developers over time, presumably limited by an upper bound, and (c) initially developers are hierarchically arranged, but over time, form a hybrid structure, in which core developers are hierarchically arranged and peripheral developers are not. Our results suggest that the organizational structure of large projects is constrained to evolve towards a state that balances the costs and benefits of developer coordination, and the mechanisms used to achieve this state depend on the project's scale.}, language = {en} } @inproceedings{FrikelBorgJorgensenetal., author = {Frikel, J{\"u}rgen and Borg, Leise and J{\o}rgensen, Jakob Sauer and Quinto, Eric Todd}, title = {Singular artifacts in incomplete data x-ray tomography}, series = {Tomographic Inverse Problems: Theory and Applications; 27.01. - 02.02.2019}, booktitle = {Tomographic Inverse Problems: Theory and Applications; 27.01. - 02.02.2019}, editor = {Burger, Martin and Hahn, Bernadette and Quinto, Eric Todd}, issn = {1660-8941}, doi = {10.4171/OWR/2019/4}, pages = {295 -- 297}, language = {en} } @article{JoblinMauerer, author = {Joblin, Mitchell and Mauerer, Wolfgang}, title = {An Interactive Survey Framework for Validation of Social Network Analysis}, series = {The R Journal}, volume = {8}, journal = {The R Journal}, number = {1}, pages = {149 -- 158}, abstract = {Abstract Social network analysis is extremely well supported by the R community and is routinely used for studying the relationships between people engaged in collaborative activities. While there has been rapid development of new approaches and metrics in this field, the challenging question of validity (how well insights derived from social networks agree with reality) is often difficult to address. We propose the use of several R packages to generate interactive surveys that are specifically well suited for validating social network analyses. Using our web-based survey application, we were able to validate the results of applying community-detection algorithms to infer the organizational structure of software developers contributing to open-source projects.}, language = {en} } @inproceedings{KoenningHeinrichLeyhetal., author = {K{\"o}nning, Michael and Heinrich, Kai and Leyh, Christian and Westner, Markus}, title = {A quantitative analysis of regional differences in pivotal IT outsourcing contract features}, series = {Proceedings of the 27th European Conference on Information Systems (ECIS), Stockholm \& Uppsala, Sweden, June 8-14, 2019 (ECIS 2019 proceedings)}, booktitle = {Proceedings of the 27th European Conference on Information Systems (ECIS), Stockholm \& Uppsala, Sweden, June 8-14, 2019 (ECIS 2019 proceedings)}, publisher = {Association for Information Systems}, isbn = {978-1-7336325-0-8}, pages = {1 -- 15}, abstract = {More than 30 years after its first implementation, IT outsourcing (ITO) is unanimously considered a critical component of corporate strategy for private and public institutions alike. While implementations of ITO around the world share some common characteristics like typical reasons for outsourcing, key success factors, or dimensions along which they can be classified, extant research also points to regional differences. However, research on this topic, specifically regarding pivotal contract features like contract value, contract length, or pricing methods, is still in its infancy, and quantitative analyses on the subject are particularly scarce. We address this research gap by analyzing data on 14,917 ITO contracts closed between 2007 and 2017 through the lens of cultural regions and three statistical methods. The contribution of our paper is threefold. First, our descriptive analysis points to globally decreasing contract lengths and contract values, confirming previous studies and practice reports. Second, an ANOVA with independent post-hoc testing provides quantitative support for the degree of dissimilarity among individual regions in pivotal ITO contract features. Finally, our quantitative replication of a previous study identifies culture-induced regional differences between USA and Japan regarding the effect of influence factors on ITO contract features}, language = {en} } @unpublished{ThausHofrichterLubnowetal., author = {Thaus, Christopher and Hofrichter, Elena and Lubnow, Matthias and Krenkel, Lars and Lehle, Karla}, title = {Hemocompatibility of Membrane Lung Components from Extracorporeal Membrane Oxygenation with Different Antithrombogenic Coatings}, doi = {10.20944/preprints202412.0615.v1}, pages = {1 -- 11}, abstract = {Thrombus formation within extracorporeal membrane oxygenation (ECMO) devices remained a critical complication. One reason seems to be the contact of blood with large artificial surfaces within the membrane lung (ML). The aim was to test the hemocompatibility of different na{\"i}ve ECMO materials. Blood and platelets from five healthy volunteers were incubated with gas exchange (GF) and heat exchange fibers (HE) from four different commercial available new MLs representing different antithrombogenic coatings. Adherent platelets were stained with rhodamine-phalloidin. Surface coverage was quantified with ImageJ. Non-adherent platelets were stained with antibodies (CD62P, PAC-1, CD61) and fibrinogen to detect platelet activation with flow cytometry. Hemolysis of red blood cells after material contact was detected. All ECMO-materials were non-hemolytic and did not induce platelet activation. However, platetelet adhesion (median (IQR)) was significantly elevated on uncoated GFs made of polymethylpentene (GF-PMP; 12 (7-19)\%) and on GFs from the Hilite-MLs (GF-Hilite; 13 ((8-19)\%) compared to the other materials. In vitro testing of platelet adhesion disclosed significant differences of ECMO-materials with different antithrombogenic surface coatings. Instead, circulating platelets remained non-activated. ECMO-materials and its coatings were non-hemolytic. Finally, this study confirmed the good hemocompatibility of GFs and HEs from commerciall available MLs.}, language = {en} } @article{LichtenauerEttlMohretal., author = {Lichtenauer, Norbert and Ettl, Katrin and Mohr, Christa and Weber, Karsten and Meussling-Sentpali, Annette}, title = {Der Pflegeroboter f{\"u}r zu Hause}, series = {Die Schwester, der Pfleger}, volume = {11}, journal = {Die Schwester, der Pfleger}, number = {21}, publisher = {Bibliomed-Medizinische Verlagsgesellschaft mbH}, pages = {48 -- 52}, abstract = {Ein interdisziplin{\"a}res Forschungsprojekt der Ostbayerischen Hochschule Regensburg untersucht, inwiefern Telemedizin und digitale Anwendungen die Therapie und Pflege von Menschen mit Schlaganfall in ihrem h{\"a}uslichen Umfeld unterst{\"u}tzen, ihre Lebensqualit{\"a}t beeinflussen und die intersektorale Versorgung verbessern kann.}, language = {de} } @incollection{KrugBittnerRolfesetal., author = {Krug, Henriette and Bittner, Uta and Rolfes, Vasilija and Fangerau, Heiner and Weber, Karsten}, title = {Verunsicherung des {\"a}rztlichen Selbstverst{\"a}ndnisses durch K{\"u}nstliche Intelligenz? Ein {\"U}berblick {\"u}ber potenzielle Auswirkungen ihres Einsatzes im {\"a}rztlichen Alltag}, series = {Unsicherheit in der Medizin ; zum Umgang mit Ungewissheit im Gesundheitswesen}, booktitle = {Unsicherheit in der Medizin ; zum Umgang mit Ungewissheit im Gesundheitswesen}, editor = {Frewer, Andreas and Bergemann, Lutz and Langmann, Elisabeth}, publisher = {K{\"o}nigshausen \& Neumann}, address = {W{\"u}rzburg}, isbn = {978-3-8260-7226-0}, pages = {195 -- 210}, language = {de} } @article{KrugGerhardsBittneretal., author = {Krug, Henriette and Gerhards, Helene and Bittner, Uta and Scorna, Ulrike and Kaufner, Nicla and Kokott, Linda Ellen and Rolfes, Vasilija and Fangerau, Heiner and Weber, Karsten}, title = {Einwilligungsf{\"a}hig oder nicht? Zur Praxis der Pr{\"u}fung von Einwilligungsf{\"a}higkeit im klinischen Alltag und deren Herausforderungen}, series = {Zeitschrift f{\"u}r Evidenz Fortbildung und Qualit{\"a}t im Gesundheitswesen}, volume = {171}, journal = {Zeitschrift f{\"u}r Evidenz Fortbildung und Qualit{\"a}t im Gesundheitswesen}, number = {August}, publisher = {Elsevier}, doi = {10.1016/j.zefq.2022.04.030}, pages = {20 -- 30}, abstract = {Die Einwilligungsf{\"a}higkeit (EWF) von Patient*innen ist eine unabdingbare Voraussetzung der informierten Zustimmung zu medizinischen Maßnahmen. Im Fall von Zweifeln an der EWF ist daher eine sorgf{\"a}ltige {\"a}rztliche Pr{\"u}fung und Beurteilung erforderlich. Trotz einer breiten theoretischen Diskussion {\"u}ber die Konzeption von EWF sowie m{\"o}gliche Vorgehensweisen zu ihrer Pr{\"u}fung mangelt es im klinischen Alltag oft an verbindlichen standardisierten Verfahrensvorgaben, sodass die Ergebnisse der EWF-Einsch{\"a}tzung interdisziplin{\"a}r wie interindividuell uneinheitlich ausfallen. Um die Qualit{\"a}t der EWF-Beurteilung verbessern zu k{\"o}nnen, bedarf es daher genauerer Kenntnisse {\"u}ber die Praxis sowie Schwierigkeiten bei der Pr{\"u}fung von EWF. Mit dem Ziel, einen Einblick in die konkreten Vorgehensweisen und Schwierigkeiten von Klinik{\"a}rzt*innen bei der Beurteilung der EWF zu erlangen, wurde eine explorative Telefonumfrage durchgef{\"u}hrt, in der die Teilnehmer*innen nach der Gewichtung der einzelnen Voraussetzungen von EWF sowie den Schwierigkeiten bei deren Pr{\"u}fung befragt wurden. Methoden Im Rahmen eines „convenience samplings" wurden fragebogenbasierte strukturierte Telefon-Interviews mit 26 an deutschen Kliniken t{\"a}tigen {\"A}rzt*innen aus den Fachbereichen Neurologie, An{\"a}sthesiologie, Chirurgie, Innere Medizin, Gyn{\"a}kologie und rekonstruktive/{\"a}sthetische Chirurgie durchgef{\"u}hrt. Die Antworten wurden im Paper-and-Pencil-Verfahren dokumentiert, Antworten auf offene Fragen mit Hilfe thematischer Codierungen zusammengefasst und computergest{\"u}tzt ausgewertet. Ergebnisse Die Mehrheit der Befragten gab manchmal bis sehr h{\"a}ufig vorkommende Zweifel an der EWF ihrer Patient*innen an, wobei deren Pr{\"u}fung vornehmlich in individueller Vorgehensweise ohne formalisierte, standardisierte Vorgaben erfolgte. In der Frage nach der Gewichtung der sieben im Fragebogen vorgeschlagenen kognitiv sowie emotional basierten Beurteilungskriterien wurden diese {\"u}berwiegend innerhalb des Spektrums von „teilweise wichtig" bis „sehr wichtig" beurteilt. Schwierigkeiten bei der Beurteilung wurden in Bezug auf die Patient*innen selbst, das Verh{\"a}ltnis zwischen {\"A}rzt*innen und Patient*innen sowie die Situation der Beurteilung angegeben. Die Wahrnehmung von Schwierigkeiten bei der Pr{\"u}fung erfolgt dabei offenbar unabh{\"a}ngig von der Relevanz, die dem jeweiligen Kriterium f{\"u}r die EWF zugeschrieben wird. Diskussion und Schlussfolgerung Insgesamt zeigen die Ergebnisse eine hohe Zustimmung zu der Relevanz der abgefragten sieben EWF-Kriterien, allerdings wurden zugleich diverse Schwierigkeiten bei ihrer tats{\"a}chlichen {\"U}berpr{\"u}fung deutlich. Ein Teil der Befragten w{\"u}nscht sich mehr Unterst{\"u}tzung bei der Bestimmung der EWF. Die Befragungsergebnisse st{\"u}tzen die Forderung, dass in diesem sensiblen medizinischen Kontext eine pr{\"a}zise Ausbildung und ausreichende zeitliche Ressourcen unbedingt erforderlich sind.}, language = {de} } @article{MaurerSaiboldGerletal., author = {Maurer, Julia and Saibold, Anna and Gerl, Katharina and Koller, Michael and K{\"o}lbl, Oliver and Pukrop, Tobias and Windschuettl, Sandra and Einhell, Sabine and Herrmann-Johns, Anne and Raptis, Georgios and Mueller, Karolina}, title = {Systematic development of a patient-reported ONCOlogical-ROUTinE-Screening (ONCO-ROUTES) procedure at the University Cancer Center Regensburg}, series = {Journal of Cancer Research and Clinical Oncology}, volume = {150}, journal = {Journal of Cancer Research and Clinical Oncology}, number = {9}, publisher = {Springer Science and Business Media LLC}, issn = {1432-1335}, doi = {10.1007/s00432-024-05955-4}, abstract = {Purpose The evaluation of treatment success and progression in oncology patient-reported outcomes (PROs) is playing an increasingly important role. Meanwhile, PROs are a component of the certification requirements of the German Cancer Society for oncology centers. PROs are used to provide supportive therapy. There is currently no instrument that fully covers the requirements. At the University Hospital Regensburg (UKR), a digital ONCOlogical-ROUTinE-Screening (ONCO-ROUTES) procedure was developed in order to assess the need for supportive therapy in a standardized way and to provide patients with supportive interventions tailored to their needs. Methods On the basis of current requirements and guidelines, the development of ONCO-ROUTES was supported by experts in focus groups and interviews, and digitalization was carried out in connection with the IT infrastructure. Results A Needs-based, Quality-of-life (QoL) and Symptoms Screening (NQS2) tool already established in the routine at the UKR was further developed into ONCO-ROUTES, which is made up of the domains therapy phase, nutrition, tobacco use, alcohol use, quality of life, general condition/functional status, physical activity, psychooncology, social services, and further support needs. By linking the digitized questionnaire to the hospital information system, the results are available for immediate use in routine operations and thus for the referral of patients for further supportive therapy. Conclusion The digital PRO application ONCO-ROUTES is designed to involve patients in monitoring additional supportive needs and thus, improves supportive interdisciplinary treatment.}, language = {en} } @article{LaufSchmiederVolynec, author = {Lauf, Wolfgang and Schmieder, G. and Volynec, I. A.}, title = {The automorphism space Σ(G) of a domain without punctiform prime ends}, series = {The Journal of Geometric Analysis}, volume = {10}, journal = {The Journal of Geometric Analysis}, number = {4}, publisher = {Springer}, issn = {1050-6926}, doi = {10.1007/BF02921993}, pages = {697 -- 712}, abstract = {Let G ⊆ ℂ be a simply connected domain and let Σ (G) be its group of conformal automorphisms with the topology of uniform chordal convergence on G. In 1984 Gaier raised the question whether the connectedness of the space Σ (G) implies that the domain G has only punctiform prime ends. As a contribution to answering this question in this paper the authors use suitable spike Junctions to construct a bounded domain without any punctiform prime end such that its automorphism space Σ (G) is not discrete, but totally disconnected.}, language = {en} } @inproceedings{GreinerCurrleEttletal., author = {Greiner, Nina and Currle, Edda and Ettl, Katrin and Frommeld, Debora and Haug, Sonja and Kudienko, Natalie and Lauer, Norina and Lichtenauer, Norbert and Meussling-Sentpali, Annette and Middel, Luise and Mohr, Christa and Pfingsten, Andrea and Popp, Christof and Raptis, Georgios and Weber, Karsten}, title = {Technik im Alltag - Technik zum Leben : Telepr{\"a}senzgest{\"u}tzte Pflege und Therapie bei Schlaganfallpatient*innen}, series = {Kann Digital Pflege?: Clusterkonferenz ,,Zukunft der Pflege", 3., September 2020, N{\"u}rnberg}, volume = {Konferenzband Teil 1}, booktitle = {Kann Digital Pflege?: Clusterkonferenz ,,Zukunft der Pflege", 3., September 2020, N{\"u}rnberg}, address = {K{\"o}nigstetten, {\"O}sterreich}, issn = {2710-3048}, pages = {57 -- 61}, abstract = {Vorgestellt wird das Forschungsvorhaben des interdisziplin{\"a}ren Forschungsprojekts „DeinHaus 4.0 - Telepr{\"a}senzroboter f{\"u}r die Pflege und Unterst{\"u}tzung von Schlaganfallpatientinnen und -patienten (TePUS)". {\"U}ber geeignete Robotersysteme sollen den Proband*innen individuell abgestimmte Angebote aus den Bereichen Telenursing und Teletherapie zur Verf{\"u}gung gestellt werden. Hierbei werden einerseits Telepr{\"a}senzsitzungen durchgef{\"u}hrt, anderseits kommen verschiedene Apps zum Einsatz. Die Interventionen werden mittels eines Mixed-Methods-Ansatzes evaluiert. Begleitend werden Technikakzeptanz und Nutzungsbereitschaft untersucht.}, subject = {Schlaganfall}, language = {de} } @unpublished{FrummetSlanyAmlingetal., author = {Frummet, Alexander and Slany, Emanuel and Amling, Jonas and Lang, Moritz and Scheele, Stephan}, title = {Explainable information retrieval in the audit domain}, doi = {10.48550/arXiv.2507.03479}, pages = {4}, abstract = {Conversational agents such as Microsoft Copilot and Google Gemini assist users with complex search tasks but often generate misleading or fabricated references. This undermines trust, particularly in high-stakes domains such as medicine and finance. Explainable information retrieval (XIR) aims to address this by making search results more transparent and interpretable. While most XIR research is domain-agnostic, this paper focuses on auditing -- a critical yet underexplored area. We argue that XIR systems can support auditors in completing their complex task. We outline key challenges and future research directions to advance XIR in this domain.}, language = {en} } @article{WeberFrommeldGerhardsetal., author = {Weber, Karsten and Frommeld, Debora and Gerhards, Helene and Krug, Henriette and Kokott, Linda Ellen and Bittner, Uta}, title = {Speaking about enhancement - methodological issues and historical examples}, series = {American Journal of Bioethics Neuroscience}, volume = {11}, journal = {American Journal of Bioethics Neuroscience}, number = {4}, doi = {10.1080/21507740.2020.1831650}, pages = {254 -- 256}, language = {en} } @inproceedings{MuehlhausenGomezLaueretal., author = {M{\"u}hlhausen, Sara and Gomez, Sarah and Lauer, Norina and Baumann, Timo}, title = {Cross lingual transfer learning does not improve aphasic speech recognition}, series = {Elektronische Sprachsignalverarbeitung 2025: Tagungsband der 36. Konferenz Halle/Saale, 05.-07. M{\"A}RZ 2025}, booktitle = {Elektronische Sprachsignalverarbeitung 2025: Tagungsband der 36. Konferenz Halle/Saale, 05.-07. M{\"A}RZ 2025}, editor = {Grawunder, Sven}, publisher = {TUDpress}, address = {Dresden}, isbn = {978-3-95908-803-9}, issn = {0940-6832}, doi = {10.35096/othr/pub-8051}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-80518}, pages = {8}, abstract = {In addressing the particular linguistic challenges posed by patients suffering from aphasia, a language disorder, this paper proposes a fine-tuning approach to enhance the speech recognition capabilities of existing models. The available aphasic research data in German is highly limited. To address this constraint, we propose a cross-lingual transfer approach to utilize English data to improve performance in German. This advancement aims to support the development of a therapy platform tailored for patients with aphasia. For the base speech recognition model, we choose to use OpenAI's Whisper model, and for fine-tuning, we make use of TalkBank's AphasiaBank. The experimental findings demonstrate that the transcription of aphasic audio with Whisper is less successful than non-aphasic audio. However, fine-tuning the transcription in the respective language resulted in an enhancement of its quality. In contrast, fine-tuning the transcription in another language and expecting a transfer of the learned aphasic speech properties led to a deterioration in its quality.}, subject = {Automatische Spracherkennung}, language = {en} } @article{EbnerFrikelLorenzetal., author = {Ebner, Andrea and Frikel, J{\"u}rgen and Lorenz, Dirk and Schwab, J. and Haltmeier, Markus}, title = {Regularization of inverse problems by filtered diagonal frame decomposition}, series = {Applied and Computational Harmonic Analysis}, volume = {62}, journal = {Applied and Computational Harmonic Analysis}, number = {January}, publisher = {Elsevier}, doi = {10.1016/j.acha.2022.08.005}, pages = {66 -- 83}, abstract = {Inverse problems are at the heart of many practical problems such as image reconstruction or nondestructive testing. A characteristic feature is their instability with respect to data perturbations. To stabilize the inversion process, regularization methods must be developed and applied. In this paper, we introduce the concept of filtered diagonal frame decomposition, which extends the classical filtered SVD to the case of frames. The use of frames as generalized singular systems allows a better match to a given class of potential solutions and is also beneficial for problems where the SVD is not analytically available. We show that filtered diagonal frame decompositions yield convergent regularization methods, derive convergence rates under source conditions and prove order optimality. Our analysis applies to bounded and unbounded forward operators. As a practical application of our tools, we study filtered diagonal frame decompositions for inverting the Radon transform as an unbounded operator on L2(R2).}, language = {en} } @misc{OPUS4-276, title = {Angewandte Forschung in der Wirtschaftsinformatik: Prozesse, Technologien, Anwendungen, Systeme und Management}, editor = {Barton, Thomas and Herrmann, Frank and Meister, Vera G. and M{\"u}ller, Christian and Seel, Christian}, publisher = {mana-Buch}, address = {Heide}, organization = {Arbeitskreis Wirtschaftsinformatik an Fachhochschulen (AKWI)}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-2767}, subject = {Wirtschaftsinformatik}, language = {de} } @misc{OPUS4-278, title = {Angewandte Forschung in der Wirtschaftsinformatik: Prozesse, Technologien, Anwendungen, Systeme und Management}, editor = {Barton, Thomas and Herrmann, Frank and Meister, Vera G. and M{\"u}ller, Christian and Seel, Christian}, publisher = {mana-Buch}, address = {Heide}, organization = {Arbeitskreis Wirtschaftsinformatikan Fachhochschulen (AKWI)}, doi = {10.15771/978-3-944330-56-3}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-2785}, language = {de} } @misc{OPUS4-280, title = {Angewandte Forschung in der Wirtschaftsinformatik}, editor = {Barton, Thomas and Herrmann, Frank and Meister, Vera G. and M{\"u}ller, Christian and Seel, Christian and Steffens, Ulrike}, publisher = {mana-Buch}, address = {Heide}, organization = {Arbeitskreis Wirtschaftsinformatik an Hochschulen f{\"u}r angewandte Wissenschaften}, doi = {10.15771/10.15771/978-3-944330-59-4}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-2809}, subject = {Wirtschaftsinformatik}, language = {de} } @misc{OPUS4-286, title = {Angewandte Forschung in der Wirtschaftsinformatik 2019}, editor = {Wolf, Martin R. and Barton, Thomas and Herrmann, Frank and Meister, Vera G. and M{\"u}ller, Christian and Seel, Christian}, publisher = {mana-Buch}, address = {Heide}, organization = {Arbeitskreis Wirtschaftsinformatik an Hochschulen f{\"u}r Angewandte Wissenschaften im deutschsprachigen Raum (AKWI)}, doi = {10.15771/978-3-944330-62-4}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-2864}, subject = {Wirtschaftsinformatik}, language = {de} } @inproceedings{GoeppelFrikelHaltmeier, author = {G{\"o}ppel, Simon and Frikel, J{\"u}rgen and Haltmeier, Markus}, title = {Data-proximal Neural Networks for Limited-view CT}, series = {Bildverarbeitung f{\"u}r die Medizin 2025 : Proceedings, German Conference on Medical Image Computing, Regensburg March 09-11, 2025}, booktitle = {Bildverarbeitung f{\"u}r die Medizin 2025 : Proceedings, German Conference on Medical Image Computing, Regensburg March 09-11, 2025}, editor = {Palm, Christoph and Breininger, Katharina and Deserno, Thomas M. and Handels, Heinz and Maier, Andreas and Maier-Hein, Klaus H. and Tolxdorff, Thomas M.}, publisher = {Springer Fachmedien Wiesbaden}, address = {Wiesbaden}, isbn = {978-3-658-47421-8}, doi = {10.1007/978-3-658-47422-5_41}, pages = {185 -- 190}, abstract = {Limited-angle computed tomography (CT) requires solving an inverse problem that is both ill-conditioned and underdetermined. In recent years, learned reconstruction methods have proven highly effective in addressing this challenge. Most of these methods follow a two-step process: first, an initial reconstruction method is applied to the data to generate an auxiliary reconstruction; second, a neural network is used to map the auxiliary reconstruction closer to the ground truth images. However, when applied to unseen data, there are no guarantees that the network's output will remain consistent with the available measurement data. To address this, we recently introduced a data-proximal network architecture. In this paper, we implement this approach for limited-angle CT and compare its performance with a standard residual network and a null space network.}, language = {en} } @inproceedings{SeligBauerFrikeletal., author = {Selig, Tim and Bauer, Patrick and Frikel, J{\"u}rgen and M{\"a}rz, Thomas and Storath, Martin and Weinmann, Andreas}, title = {Two-stage Approach for Low-dose and Sparse-angle CT Reconstruction using Backprojection}, series = {Bildverarbeitung f{\"u}r die Medizin 2025 (BVM 2025): Proceedings, German Conference on Medical Image Computing, Regensburg March 09-11, 2025}, booktitle = {Bildverarbeitung f{\"u}r die Medizin 2025 (BVM 2025): Proceedings, German Conference on Medical Image Computing, Regensburg March 09-11, 2025}, editor = {Palm, Christoph and Breininger, Katharina and Deserno, Thomas M. and Handels, Heinz and Maier, Andreas and Maier-Hein, Klaus H. and Tolxdorff, Thomas M.}, publisher = {Springer VS}, address = {Wiesbaden}, isbn = {978-3-658-47421-8}, doi = {10.1007/978-3-658-47422-5_67}, pages = {286 -- 291}, abstract = {This paper presents a novel two-stage approach for computed tomography (CT) reconstruction, focusing on sparse-angle and low-dose setups to minimize radiation exposure while maintaining high image quality. Two-stage approaches consist of an initial reconstruction followed by a neural network for image refinement. In the initial reconstruction, we apply the backprojection (BP) instead of the traditional filtered backprojection (FBP). This enhances computational speed and offers potential advantages for more complex geometries, such as fan-beam and cone-beam CT. Additionally, BP addresses noise and artifacts in sparse-angle CT by leveraging its inherent noise-smoothing effect, which reduces streaking artifacts common in FBP reconstructions. For the second stage, we fine-tune the DRUNet proposed by Zhang et al. to further improve reconstruction quality. We call our method BP-DRUNet and evaluate its performance on a synthetically generated ellipsoid dataset alongside thewell-established LoDoPaBCT dataset. Our results show that BP-DRUNet produces competetive results in terms of PSNR and SSIM metrics compared to the FBP-based counterpart, FBPDRUNet, and delivers visually competitive results across all tested angular setups.}, language = {en} } @article{HillebrandWestnerMatschi, author = {Hillebrand, Patrick and Westner, Markus and Matschi, Markus}, title = {Schl{\"u}sselfaktoren erfolgreicher CIOs}, series = {HMD Praxis der Wirtschaftsinformatik}, volume = {59}, journal = {HMD Praxis der Wirtschaftsinformatik}, publisher = {Springer Nature}, doi = {10.1365/s40702-022-00867-8}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-33751}, pages = {762 -- 779}, abstract = {Die vorliegende Studie untersucht Schl{\"u}sselfaktoren erfolgrei- cher CIOs in deutschen Großunternehmen. Mit einer mittleren Verweildauer (Median) von 4,0 Jahren weisen deutsche CIOs, die mit 43 \% noch {\"u}berwiegend an den CFO berichten, im Vergleich zu anderen C-Level-Positionen eine deutlich k{\"u}rzere Verweildauer im Amt auf. Die Ergebnisse aus 60 Interviews mit erfolgreichen deutschsprachigen CIOs, die prim{\"a}r {\"u}ber eine {\"u}berdurchschnittlich lange Verweildauer verf{\"u}gen, lassen verschiedene Schl{\"u}sselfaktoren f{\"u}r den Erfolg erkennen: Grundvoraussetzung ist stets die Gew{\"a}hrleistung eines sicheren und effizienten IT-Betriebs. {\"U}ber effektive und innovative Change-Projekte machen die interviewten CIOs den IT-Mehrwert transparent und agieren als Br{\"u}ckenbauer zwischen IT und Fachbereichen. Dadurch wirken sie positiv auf die Firmenkultur ein und etablieren die IT nachhaltig in den Fachbereichen als Erfolgsfaktor. Erfolgreiche CIOs selbst sind keine „Techies", sondern zeichnen sich durch hohe F{\"u}hrungskompetenz und ein hohes Gesch{\"a}ftsverst{\"a}ndnis, gepaart mit vision{\"a}rem Denken aus. Dadurch gelingt es ihnen, die IT zukunftsorientiert auszurichten und Anforderungen und Potenziale f{\"u}r und aus den Fachbereichen fr{\"u}hzeitig zu antizipieren. Die zuk{\"u}nftige Entwicklung der CIO-Organisation und der Paradigmen in der IT wird durch die Studienteilnehmer hingegen teilweise kontrovers diskutiert - so gibt es beispielsweise bei der Beurteilung der Sinnhaftigkeit und Relevanz der CDO-Position noch kein einheitliches Meinungsbild.}, language = {de} } @article{HillebrandWestnerMatschi, author = {Hillebrand, Patrick and Westner, Markus and Matschi, Markus}, title = {Key factors of successful CIOs}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-66882}, pages = {22}, abstract = {This study examines key factors of successful CIOs in large German companies. With a median tenure of 4.0 years, German CIOs, most of whom (43\%) still report to the CFO, have a significantly shorter tenure compared to other C‑level positions. The results of 60 interviews with successful German-speaking CIOs, who primarily have an above-average tenure, reveal various key factors for successful CIOs: The foundation for success is to ensure secure and efficient IT operations. Through effective and innovative change pro-jects, the CIOs interviewed make the added value of IT transparent and act as bridge-builders between IT and the business. In this way, they have a positive impact on the corporate culture and establish IT as a success factor in the business in the long term. Successful CIOs themselves are not "techies" but are characterized by a high level of leadership competence and a high level of business expertise, coupled with visionary thinking. This enables them to align IT in a future-oriented manner and to anticipate de-mands and potential for and from the business units at an early stage. The future devel-opment of the CIO organization and the paradigms in IT, on the other hand, was discussed controversially by some of the study participants—for example, there is still no uniform opinion on the relevance of the CDO position.}, language = {en} } @misc{HornPippigRaptisetal., author = {Horn, L. C and Pippig, S. and Raptis, Georgios and Fischer, Uta and Kohler, U. and Hentschel, Bettina and Martin, Rosemarie}, title = {00083 PAI-1 AND UFA AS PARAMETERS OF TUMORASSOCIATED PROTEOLYSIS IN CERVICAL CARCINOMA}, series = {International Journal of Gynecologic Cancer}, volume = {15}, journal = {International Journal of Gynecologic Cancer}, number = {Suppl 2}, publisher = {BMJ}, issn = {1048-891X}, doi = {10.1136/ijgc-00009577-200509001-00083}, language = {en} } @article{SchuheggerKaraGalkaetal., author = {Schuhegger, Lukas and Kara, Sinan and Galka, Stefan and D{\"u}nnweber, Jan and Meißner, Sebastian}, title = {Umzugsplanung mit Fabrikdatenmodellen und Virtual Reality}, series = {Zeitschrift f{\"u}r wirtschaftlichen Fabrikbetrieb}, volume = {119}, journal = {Zeitschrift f{\"u}r wirtschaftlichen Fabrikbetrieb}, number = {11}, publisher = {de Gruyter}, issn = {2511-0896}, doi = {10.1515/zwf-2024-1154}, pages = {799 -- 804}, abstract = {Angesichts eines dynamischen industriellen Umfelds m{\"u}ssen produzierende Unternehmen flexibel bleiben und sich kontinuierlich anpassen, um ihre Wettbewerbsf{\"a}higkeit zu erhalten. Eine effektive Planung von Restrukturierungen in Produktionssystemen, oft als Umzugsplanung bezeichnet, ist entscheidend, um Verz{\"o}gerungen zu vermeiden und Stillstandszeiten zu minimieren. Die Identifikation von Umzugsf{\"a}llen, welche den Umfang umzuziehender Ressourcen wie Maschinen, Anlagen, Ausr{\"u}stungen und Arbeitspl{\"a}tzen beschreiben und die Definition zugeh{\"o}riger Aufgaben sind essenzielle Schritte der Umzugsplanung. Dieser Beitrag stellt eine Vorgehensweise zur Bestimmung von Umzugsf{\"a}llen mittels eines Fabrikdatenmodells vor, erg{\"a}nzt durch eine Visualisierung in Virtual Reality, um Planende bei der Umzugsplanung zu unterst{\"u}tzen.}, language = {de} }