Search

Your search keyword '"Koehler, A."' showing total 2,029 results
Start Over Author "Koehler, A." Language german
2,029 results on '"Koehler, A."'

2. Examining Common Paradigms in Multi-Task Learning

Author

Elich, Cathrin, Kirchdorfer, Lukas, Köhler, Jan M., and Schott, Lukas

Subjects
Computer Science - Machine Learning, Computer Science - Artificial Intelligence, Computer Science - Computer Vision and Pattern Recognition
Abstract

While multi-task learning (MTL) has gained significant attention in recent years, its underlying mechanisms remain poorly understood. Recent methods did not yield consistent performance improvements over single task learning (STL) baselines, underscoring the importance of gaining more profound insights about challenges specific to MTL. In our study, we investigate paradigms in MTL in the context of STL: First, the impact of the choice of optimizer has only been mildly investigated in MTL. We show the pivotal role of common STL tools such as the Adam optimizer in MTL empirically in various experiments. To further investigate Adam's effectiveness, we theoretical derive a partial loss-scale invariance under mild assumptions. Second, the notion of gradient conflicts has often been phrased as a specific problem in MTL. We delve into the role of gradient conflicts in MTL and compare it to STL. For angular gradient alignment we find no evidence that this is a unique problem in MTL. We emphasize differences in gradient magnitude as the main distinguishing factor. Overall, we find surprising similarities between STL and MTL suggesting to consider methods from both fields in a broader context., Comment: Accepted for publication in German Conference for Pattern Recognition (GCPR), 2024

Published
2023

22. Abstract: MOOD 2020 : A Public Benchmark for Out-of-distribution Detection and Localization on Medical Images

Author

Zimmerer, David, Full, Peter, Isensee, Fabian, Jäger, Paul, Adler, Tim, Petersen, Jens, Köhler, Gregor, Ross, Tobias, Reinke, Annika, Kascenas, Antanas, Jensen, Bjørn Sand, O’Neil, Alison Q., Tan, Jeremy, Hou, Benjamin, Batten, James, Qiu, Huaqi, Kainz, Bernhard, Shvetsova, Nina, Fedulova, Irina, Dylov, Dmitry V., Yu, Baolun, Zhai, Jianyang, Hu, Jingtao, Si, Runxuan, Zhou, Sihang, Wang, Siqi, Li, Xinyang, Chen, Xuerun, Zhao, Yang, Marimont, Sergio Naval, Tarroni, Giacomo, Saase, Victor, Maier-Hein, Lena, Maier-Hein, Klaus, Gesellschaft für Informatik e.V. (GI), Deserno, Thomas M., editor, Handels, Heinz, editor, Maier, Andreas, editor, Maier-Hein, Klaus, editor, Palm, Christoph, editor, and Tolxdorff, Thomas, editor

Published
2023
Full Text
View/download PDF

23. When Healing Turns to Activism: Formers and Family Members’ Motivation to Engage in P/CVE.

Author

Jonatan Schewe and Daniel Koehler

Subjects
former extremists, relatives of extremists, p/cve, individual motivations, Political science, Political science (General), JA1-92
Abstract

The involvement of former extremists or family members of terrorists in measures aimed at preventing and countering violent extremism (P/CVE) has recently gained more attention in research and practice. However, little is yet known about the motivations of these individuals as to why they chose to engage in P/CVE activities. Understanding what drives such engagement could provide a better appreciation of the potential impact of such deployment, whether beneficial or detrimental to both the individuals involved and their respective P/CVE-target audience – and contribute to the evolving discourse regarding the effectiveness and potential risks of such P/CVE interventions. This article draws on eight biographical-narrative interviews with four former right-wing extremists and with four relatives of jihadist foreign fighters, all of whom are currently engaged in P/CVE work. Through qualitative reconstructive methods, a combination of narrative and thematic approaches was used to reconstruct the action-relevant orientations for the interviewees' activism. Results indicate that family members are motivated by coping mechanisms for traumatic stress, by social relatedness derived from a ‘positive marginality’, and in response to situational demands. Motivations of former extremists include finding their way back into society, having their new identity mirrored back to them, or maintaining a sense of self-continuity through ‘role residuals’. The results show that, in the case of family members, motivation is affected by exposure to traumatic stress. They also suggest that a locus of control among former extremists can signify different stages of deradicalisation in some forms of exit pathways and thus help to identify different risks depending on a former’s P/CVE role.

Published
2021

26. Marseille, Montpellier und das Mittelmeer.

Author

Nicolussi-Koehler, Stephan

Subjects
Economic History, Middle Ages, Mediterranean Trade, Southern France, Marseille, Montpellier, Wirtschaftsgeschichte, Mittelalter, Mediterraner Handel, Südfrankreich, History and Archaeology, CE period up to c 1500
Abstract

The book examines how the integration of local merchants in the south of France contributed to the commercial expansion of the cities of Marseille and Montpellier in the 12th and 13th centuries. The origin of the flourishing long-distance trade is not sought in the establishment of the Crusader states in the East, but instead is explored at its roots, the local trade cycles in the hinterland of the port cities. The book is built around micro-historical sketches about specific merchant families, merchant ships and trade privileges, thus revealing unknown connections and new perspectives. Mediterranean trade is described from the perspective of inland merchants, and trade with the Levant is seen from the perspective of Provençal and Catalan merchants who traded through foreign financial centres and under foreign flags. The book explores how the hinterland made the long-distance trade of Marseille and Montpellier possible in the first place by providing goods, capital and manpower., Comment les réseaux de marchands du sud de la France ont-ils contribué à l’essor commercial de Marseille et de Montpellier aux xiie et xiiie siècles? Comment les villes de l’intérieur des terres, en fournissant des biens, des capitaux et des personnes, ont-elles permis l’expansion du commerce méditerranéen des grandes villes côtières? Dans cette étude, les fondements du commerce à longue distance sont non seulement expliqués par l’établissement des États croisés au Levant mais ils sont aussi explorés directement à leur source, à savoir les circuits commerciaux actifs dans l’arrière-pays, aux alentours des villes portuaires. Des analyses microhistoriques de familles marchandes, de navires marchands et de privilèges commerciaux spécifiques mettent en lumière des liens jusqu’alors inconnus entre les différents acteurs économiques, ouvrant ainsi de nouvelles perspectives sur le développement du commerce à longue distance dans le sud de la France au Moyen Âge., Wie hat die Vernetzung lokaler südfranzösischer Kaufleute zum kommerziellen Aufschwung der Städte Marseille und Montpellier im 12. und 13. Jahrhundert beigetragen? Wie hat das Binnenland durch die Bereitstellung von Waren, Kapital und Menschen den expandierenden Mittelmeerhandel der größeren Küstenstädte ermöglicht? Der Ursprung des Fernhandels wird in dieser Studie nicht nur mit der Errichtung der Kreuzfahrerherrschaften im Osten erklärt, sondern direkt an seiner Wurzel erforscht, nämlich an den lokalen Handelskreisläufen im Hinterland der Hafenstädte. In mikrohistorischen Untersuchungen zu bestimmten Kaufmannsfamilien, Handelsschiffen und Handelsprivilegierungen werden bisher unbekannte Verbindungen zwischen den verschiedenen wirtschaftlichen Akteuren zum Vorschein gebracht und so neue Sichtweisen auf die Entwicklung des südfranzösischen Fernhandels im Mittelalter eröffnet.

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results