@article{LinardosPatiBaidetal., author = {Linardos, Akis and Pati, Sarthak and Baid, Ujjwal and Edwards, Brandon and Foley, Patrick and Ta, Kevin and Chung, Verena and Sheller, Micah and Khan, Muhammad Irfan and Jafaritadi, Mojtaba and Kontio, Elina and Khan, Suleiman and M{\"a}chler, Leon and Ezhov, Ivan and Shit, Suprosanna and Paetzold, Johannes C. and Grimberg, Gustav and Nickel, Manuel A. and Naccache, David and Siomos, Vasilis and Passerat-Palmbach, Jonathan and Tarroni, Giacomo and Kim, Daewoon and Klausmann, Leonard L. and Shah, Prashant and Menze, Bjoern and Makris, Dimitrios and Bakas, Spyridon}, title = {The MICCAI Federated Tumor Segmentation (FeTS) Challenge 2024: Efficient and Robust Aggregation Methods for Federated Learning}, series = {Machine Learning for Biomedical Imaging (MELBA Journal)}, volume = {3}, journal = {Machine Learning for Biomedical Imaging (MELBA Journal)}, number = {December}, publisher = {MELBA}, doi = {10.59275/j.melba.2025-5242}, pages = {757 -- 774}, abstract = {We present the design and results of the MICCAI Federated Tumor Segmentation (FeTS) Challenge 2024, focusing on federated learning (FL) for glioma sub-region segmentation in multi-parametric MRI scans, and evaluating novel weight aggregation methods for increased robustness and efficiency. Participating methods from six teams are evaluated using a standardized FL setup and a multi-institutional dataset derived from the BraTS glioma benchmark—a dataset consisting of 1,251 training cases, 219 validation cases, and 570 hidden test cases, with segmentations of enhancing tumor (ET), tumor core (TC), and whole tumor (WT). Teams are ranked by a cumulative scoring system accounting for segmentation performance—measured by Dice Similarity Coefficient (DSC) and 95th percentile Hausdorff Distance (HD95)—and communication efficiency assessed through the convergence score. A PID-controller-based approach emerges as the top-performing method, achieving a mean DSC of 0.733, 0.761, and 0.751 for ET, TC, and WT, respectively, with corresponding HD95 values of 33.922mm, 33.623mm, and 32.309mm, while also being the most efficient with a convergence score of 0.764. These results contribute to ongoing advances in FL, building on top-performers from previous challenge iterations and surpassing them, highlighting PID controllers as powerful mechanisms for stabilizing and optimizing weight aggregation in FL. The challenge code is available at https://github.com/FeTS-AI/Challenge.}, language = {en} } @phdthesis{Brandt, author = {Brandt, Hanna}, title = {Exoskelettale Unterst{\"u}tzung in der Pflege - Evaluation der muskuloskelettalen Belastung des unteren R{\"u}ckens und der Akzeptanz von Exoskeletten beim passiven Transfer Sitz-Stand Eine Mixed-Methods-Studie}, publisher = {Universit{\"a}t Regensburg}, doi = {10.5283/epub.59400}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:355-epub-594003}, pages = {137, XLIX}, abstract = {Diese Mixed-Methods-Studie unertsucht den Einfluss von Exoskeletten auf die physische Belastung und Akzeptanz von Pflegekr{\"a}ften. Ziel der Studie war es, die Wirkung eines passiven, r{\"u}ckenunterst{\"u}tzenden Exoskeletts auf Muskelaktivit{\"a}t, K{\"o}rperhaltung und subjektivem Anstrengungsempfinden w{\"a}hrend eines simulierten Transfers von Patient*innen zu evaluieren. Dazu wurde eine quantitative Analyse mit 33 Pflegekr{\"a}ften durchgef{\"u}hrt, die ein Exoskelett in drei unterschiedlichen Unterst{\"u}tzungsformen trugen. Die Muskelaktivit{\"a}t zeigte keine signifikanten Unterschiede, gleichzeitig zeigten sich signifikante Ergebnisse in der Reduktion des subjektiven Belastungsempfinden beim Tragen des Exoskeletts und der geringeren H{\"u}ftbeugung beim Tragen des Exoskeletts. Eine qualitative Studie erg{\"a}nzte die Untersuchung, indem die Akzeptanzfaktoren und Implementierungsh{\"u}rden identifiziert wurden. Besonders der Tragekomfort und die Kompatibilit{\"a}t des Exoskeletts mit den spezifischen Pflegeaufgaben sind entscheidend. Weitere Forschung n{\"o}tig ist, um die langfristigen Effekte auf die muskuloskelettale Gesundheit und die optimale Implementierung dieser Technologie in Pflegeeinrichtungen besser zu verstehen. This mixed-methods study investigated the influence of exoskeletons on the physical strain and acceptance of nurses. The aim of the study was to evaluate the effect of a passive, back-supporting exoskeleton on muscle activity, posture and subjective perception of exertion during a simulated transfer of patients. For this purpose, a quantitative analysis was conducted with 33 nurses wearing an exoskeleton in three different forms of support. There were no significant differences in muscle activity, but there were significant results in the reduction of the subjective feeling of strain when wearing the exoskeleton and less hip flexion when wearing the exoskeleton. A qualitative study supplemented the investigation by identifying the acceptance factors and implementation hurdles. In particular, wearing comfort and the compatibility of the exoskeleton with specific care tasks are crucial. Further research is needed to better understand the long-term effects on musculoskeletal health and the optimal implementation of this technology in care facilities. Translated with www.DeepL.com/Translator (free version)}, language = {de} } @book{Schildbach, author = {Schildbach, Ina}, title = {Armut verstehen}, publisher = {Wochenschau Verlag}, address = {Frankfurt am Main}, isbn = {978-3-7566-1664-0}, pages = {200}, abstract = {Um Armut zu bek{\"a}mpfen, scheint es naheliegend, mehr Geld zu fordern: mehr Geld in Gestalt von Sozialstaatsausgaben, f{\"u}r Entwicklungshilfe etc. Nur: In Zeiten der Klimakrise kann darin nicht die zentrale L{\"o}sung f{\"u}r das nach wie vor dr{\"a}ngende Problem der nationalen und weltweiten Armut liegen. Was folgt daraus? Nat{\"u}rlich nicht, dass wir Menschen und Staaten das Recht auf Entwicklung absprechen. Unsere exklusiven und exkludierenden Privilegien aufgrund der Zuf{\"a}lligkeit des Geburtsortes lassen sich nicht rechtfertigen. Dennoch ist diese Erkenntnis der Nicht-Verallgemeinerbarkeit relevant. Sie verdeutlicht, dass wir prinzipiell anders {\"u}ber das Ph{\"a}nomen Armut nachdenken m{\"u}ssen. Hierzu m{\"o}chte dieses Buch einen Beitrag leisten.}, language = {de} } @inproceedings{KhamisHurjuiKaraetal., author = {Khamis, Mahmoud Abo and Hurjui, Alexandru-Mihai and Kara, Ahmet and Olteanu, Dan and Suciu, Dan and Tian, Zilu}, title = {Output-Sensitive Evaluation of Acyclic Conjunctive Regular Path Queries}, series = {29th International Conference on Database Theory (ICDT 2026)}, booktitle = {29th International Conference on Database Theory (ICDT 2026)}, publisher = {Dagstuhl Publishing}, doi = {10.4230/LIPIcs.ICDT.2026.18}, pages = {18:1 -- 18:20}, abstract = {Conjunctive Regular Path Queries, or CRPQs for short, are an essential construct in graph query languages. In this paper, we propose the first output-sensitive algorithm for evaluating acyclic CRPQs. It is output-sensitive in the sense that its complexity is a function of the sizes of the input graph and of the query output. In particular, it does not depend on the output sizes of the regular expressions that appear in the query, as these sizes can be much larger than the query output size. Our algorithm proceeds in two stages. In the first stage, it contracts the given query into a free-connex acyclic one such that the output of the original query can be obtained from the output of the contracted one. This contraction removes bound variables by composing regular expressions or by promoting bound variables to free ones. The minimum necessary number of promoted bound variables gives the contraction width, which is a novel parameter specific to CRPQs. In the second stage, our algorithm evaluates the free-connex acyclic CRPQ and projects away the columns of the promoted bound variables. It ensures output-sensitivity by computing the calibrated outputs of the regular expressions appearing in the free-connex acyclic CRPQ in time proportional to their sizes. Our algorithm has lower complexity than the state-of-the-art approaches for problem instances where (i) the query output is asymptotically smaller than the worst-case output size or (ii) the largest output size of any of the regular expression in the query.}, language = {en} } @inproceedings{AbramovichDeutchFrostetal., author = {Abramovich, Omer and Deutch, Daniel and Frost, Nave and Kara, Ahmet and Olteanu, Dan}, title = {Advancing Fact Attribution for Query Answering: Aggregate Queries and Novel Algorithms}, series = {Proceedings of the VLDB Endowment}, volume = {18}, booktitle = {Proceedings of the VLDB Endowment}, number = {11}, publisher = {VLDB Endowment}, issn = {2150-8097}, doi = {10.14778/3749646.3749670}, pages = {3996 -- 4008}, abstract = {In this paper, we introduce a novel approach to computing the contribution of input tuples to the result of the query, quantified by the Banzhaf and Shapley values. In contrast to prior algorithmic work that focuses on Select-Project-Join-Union queries, ours is the first practical approach for queries with aggregates. It relies on two novel optimizations that are essential for its practicality and significantly improve the runtime performance already for queries without aggregates. The first optimization exploits the observation that many input tuples have the same contribution to the query result, so it is enough to compute the contribution of one of them. The second optimization uses the gradient of the query lineage to compute the contributions of all tuples with the same complexity as for one of them. Experiments with a million instances over 3 databases show that our approach achieves up to 3 orders of magnitude runtime improvements over the state-of-the-art for queries without aggregates, and that it is practical for aggregate queries.}, language = {en} } @article{ThurnerWissing, author = {Thurner, Dorothea and Wissing, Christiane}, title = {Fair und einheitlich: Beurteilen in der Ausbildung}, series = {Pflegezeitschrift}, volume = {77}, journal = {Pflegezeitschrift}, number = {12}, publisher = {Springer}, issn = {0945-1129}, doi = {10.1007/s41906-024-2737-2}, pages = {36 -- 38}, abstract = {Die Beurteilung von Pflegelernenden geh{\"o}rt zu den Kernaufgaben Pflegelehrender. Der Beitrag stellt die theoretischen Grundlagen zum Thema Beurteilung und Kompetenz, basierend auf der Buchver{\"o}ffentlichung von Kerres et al. (2024), geb{\"u}ndelt dar. Weiterf{\"u}hrend wird die Rolle der Pflegelehrenden hinsichtlich ihrer diagnostischen Kompetenzen betrachtet. Herausforderungen wie der Fachkr{\"a}ftemangel im Bereich Gesundheit und Pflege sowie die Heterogenit{\"a}t der Lernenden beeinflussen die Beurteilungskultur. Insgesamt ist die Beurteilung ein dynamischen Prozess, der eine bewusste und reflexive Hinwendung des Kollegiums bedarf.}, language = {de} } @article{GerstnerFischerHackenberg, author = {Gerstner, Mathias and Fischer, Sebastian and Hackenberg, Rudolf}, title = {Spatio-Temporal and Context-Aware Dataset for Mobile Network Forecasting}, series = {International Journal on Advances in Networks and Services}, volume = {19}, journal = {International Journal on Advances in Networks and Services}, number = {1\&2}, publisher = {IARIA}, issn = {1942-2644}, pages = {83 -- 97}, abstract = {As autonomous driving becomes increasingly feasible, the German government has introduced a legal framework to enable the operation of vehicles with Level 4 automated driving functionality. A key requirement is the maintenance of a continuous connection between such vehicles and a remote technical supervisor. If this link is lost, the vehicle must transition into a safe state by bringing itself to a controlled stop. To mitigate the risk of connection loss, accurate forecasting of mobile network availability along routes is essential. This paper describes a spatio-temporal analysis of mobile network signal quality metrics along a fixed rural route based on 48 repeated measurement drives. The route was segmented into 320 spatial reference sections to enable consistent cross-trip comparison and stability assessment. A classification into usable and non-usable connectivity states reveals that more than half of the sections show pronounced trip-to-trip variability. The results show that mobile network quality is not only dependent on geographic location but is also influenced by environmental conditions. While global correlations between weather parameters and raw signal metrics remain weak, moderate relationships can be seen when analyzing the share of functionally usable connectivity in spatially unstable sections. A walk-forward forecasting model demonstrates that the inclusion of temperature in the model reduces prediction error compared to a purely historical baseline in 73.7\% of evaluated trips. The findings show the importance of feature selection and also the limitations of linear modeling approaches. Rather than acting as deterministic predictors of signal strength, contextual parameters primarily modulate connectivity uncertainty in spatially unstable regions. These findings underscore the importance of contextual information and localized modeling to predict network availability for safety-critical systems, such as autonomous vehicles.}, language = {en} } @inproceedings{BoehmLehmannHerrmann, author = {B{\"o}hm, Valter and Lehmann, Lukas and Herrmann, David}, title = {Ein Beitrag zu M{\"o}glichkeiten der Realisierung von formver{\"a}nderlichen Tensegrity-Strukturen - homogene 2D-Tensegrity-Netze mit rechteckigen Drucksegment-Topologien}, series = {Berichte der 16. Fachtagung Baustatik - Baupraxis 16 : 28.-29. Mai 2026, Dresden}, booktitle = {Berichte der 16. Fachtagung Baustatik - Baupraxis 16 : 28.-29. Mai 2026, Dresden}, address = {Dresden}, doi = {10.25368/2026.085}, url = {http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa2-1058375}, pages = {8}, abstract = {Die vorliegende Arbeit untersucht die Topologie und das mechanische Verhalten von 2D-Tensegrity-Netzen auf Basis regelm{\"a}ßiger, polygonaler Grundformen. Ausgehend von grundlegenden geometrischen {\"U}berlegungen zu Dreiecks-, Quadrat- und Sechseck-Tessellierungen werden unterschiedliche Tensegrity-Basiseinheiten entwickelt und systematisch zu periodischen Netzstrukturen kombiniert. Der Fokus liegt dabei auf quadratischen Tensegrity Zellen. Neben etablierten heterogenen Netzstrukturen, die aus der Kombination unterschiedlicher Drucksegmenttypen bestehen, werden erstmals homogene Tensegrity-Netze mit einheitlicher Drucksegmenttopologie untersucht. Durch die Einf{\"u}hrung neuartiger Drucksegmente mit rechteckiger Außenform k{\"o}nnen Tensegrity-Netze mit deutlich kleineren Leerstellen aufgebaut werden. Die mechanische Charakterisierung erfolgt mittels geometrisch und statisch nicht- linearer Finite-Element-Analysen sowie anhand von Flexibilit{\"a}tsellipsen elementarer Einheiten . Die Ergebnisse zeigen, dass sich durch gezielte Variation von Geometrie, Vorspannung und innerer Topologie sowohl Steifigkeit als auch kollisionsfreie Verformbarkeit der Netze gezielt einstellen lassen. Damit leisten die untersuchten Strukturen einen Beitrag zum geometriebasierten Entwurf materialeffizienter und adaptiver Tragwerkskonzepte.}, language = {de} } @inproceedings{EhrnspergerHoeseSiartetal., author = {Ehrnsperger, Matthias G. and Hoese, H. L. and Siart, U. and Eibert, T. F.}, title = {Performance Investigation of Machine Learning Algorithms for Simple Human Gesture Recognition Employing an Ultra Low Cost Radar System}, series = {2019 Kleinheubach Conference = Kleinheubacher Tagung : September 23-25, 2019, Miltenberg, Germany / International Union of Radio Science (U.R:S.I.)}, booktitle = {2019 Kleinheubach Conference = Kleinheubacher Tagung : September 23-25, 2019, Miltenberg, Germany / International Union of Radio Science (U.R:S.I.)}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-3-948571-00-9}, pages = {4}, abstract = {The following topics are dealt with: radar imaging; iterative methods; electromagnetic fields; radar detection; learning (artificial intelligence); electromagnetic interference; transfer functions; image resolution; synthetic aperture radar; ferrites.}, language = {de} } @inproceedings{BuerknerWestner, author = {B{\"u}rkner, Leonhard and Westner, Markus}, title = {Critical Success Factors for AI Adoption: a Multivocal Literature Review and a Top Management Perspective}, series = {Information and Communication Technology: 14th International Symposium, SOICT 2025, Nha Trang City, Vietnam, December 12-14, 2025, Proceedings, Part IV}, booktitle = {Information and Communication Technology: 14th International Symposium, SOICT 2025, Nha Trang City, Vietnam, December 12-14, 2025, Proceedings, Part IV}, editor = {Buntine, Wray and Fjeld, Morten and Sch{\"o}ffmann, Klaus and Tran, Truyen and Tran, Minh-Triet and Huynh, Thi Thanh Binh and Dam, Tuan}, publisher = {Springer}, address = {Singapore}, isbn = {978-981-92-2597-2}, issn = {1865-0929}, doi = {10.1007/978-981-92-2597-2_38}, pages = {472 -- 485}, abstract = {The strategic adoption of Artificial Intelligence (AI) is a critical determinant of competitive advantage, yet organizations face high failure rates. This paper aims to identify and categorize the Critical Success Factors (CSFs) that influence successful AI adoption by synthesizing academic and practitioner knowledge from a top-management perspective. We conducted a multivocal literature review of 57 academic and 20 practitioner sources, screened per PRISMA. From vote-count synthesis we identified 16 CSFs grouped via the Technology-Organization-Environment (TOE) framework, with organizational factors dominating such as leadership support, AI literacy, and cultural readiness. Practitioner evidence corroborates most academic CSFs and adds implementation-centric aspects (e.g., AI scalability, use-case-value alignment, partnerships). Implications for top management/Chief Information Officers include prioritizing data governance, change capability, and portfolio-level value realization. From a theoretical perspective, the paper supports continued relevance of the TOE framework for AI while highlighting the amplified importance of its organizational dimension.}, language = {en} }