[{"date_created":"2025-10-27T08:20:53Z","type":"journal_article","department":[{"_id":"49"}],"publication":"Acta Acustica","issue":"65","main_file_link":[{"open_access":"1","url":"https://acta-acustica.edpsciences.org/articles/aacus/abs/2025/01/aacus250049/aacus250049.html"}],"language":[{"iso":"eng"}],"doi":"10.1051/aacus/2025044","year":"2025","title":"Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters","publication_identifier":{"issn":["2681-4617"]},"author":[{"last_name":"Claes","orcid":"0000-0002-4393-268X","first_name":"Leander","full_name":"Claes, Leander","id":"11829"},{"first_name":"Kevin","last_name":"Koch","full_name":"Koch, Kevin"},{"first_name":"Olga","last_name":"Friesen","full_name":"Friesen, Olga","id":"44026"},{"first_name":"Lars","last_name":"Meihost","full_name":"Meihost, Lars","id":"24769"}],"publication_status":"published","date_updated":"2026-01-05T08:00:05Z","article_type":"original","intvolume":" 9","oa":"1","citation":{"ieee":"L. Claes, K. Koch, O. Friesen, and L. Meihost, “Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters,” Acta Acustica, vol. 9, no. 65, 2025, doi: 10.1051/aacus/2025044.","apa":"Claes, L., Koch, K., Friesen, O., & Meihost, L. (2025). Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters. Acta Acustica, 9(65). https://doi.org/10.1051/aacus/2025044","chicago":"Claes, Leander, Kevin Koch, Olga Friesen, and Lars Meihost. “Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters.” Acta Acustica 9, no. 65 (2025). https://doi.org/10.1051/aacus/2025044.","short":"L. Claes, K. Koch, O. Friesen, L. Meihost, Acta Acustica 9 (2025).","mla":"Claes, Leander, et al. “Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters.” Acta Acustica, vol. 9, no. 65, EDP Sciences, 2025, doi:10.1051/aacus/2025044.","bibtex":"@article{Claes_Koch_Friesen_Meihost_2025, title={Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters}, volume={9}, DOI={10.1051/aacus/2025044}, number={65}, journal={Acta Acustica}, publisher={EDP Sciences}, author={Claes, Leander and Koch, Kevin and Friesen, Olga and Meihost, Lars}, year={2025} }","ama":"Claes L, Koch K, Friesen O, Meihost L. Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters. Acta Acustica. 2025;9(65). doi:10.1051/aacus/2025044"},"project":[{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)","_id":"245"}],"publisher":"EDP Sciences","_id":"62000","user_id":"11829","volume":9,"status":"public"},{"language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1","url":"https://arxiv.org/pdf/2411.14900"}],"doi":"10.1142/s0218202525500447","author":[{"id":"11829","full_name":"Claes, Leander","last_name":"Claes","orcid":"0000-0002-4393-268X","first_name":"Leander"},{"last_name":"Lankeit","first_name":"Johannes","full_name":"Lankeit, Johannes"},{"id":"31496","full_name":"Winkler, Michael","last_name":"Winkler","first_name":"Michael"}],"publication_identifier":{"issn":["1793-6314"]},"year":"2025","title":"A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions","intvolume":" 35","date_updated":"2026-01-05T07:59:41Z","date_created":"2024-06-20T13:43:42Z","department":[{"_id":"90"},{"_id":"49"}],"type":"journal_article","publication":"Mathematical Models and Methods in Applied Sciences","issue":"11","_id":"54837","publisher":"World Scientific Pub Co Pte Ltd","page":"2465-2512","volume":35,"user_id":"11829","status":"public","external_id":{"arxiv":["2411.14900"]},"oa":"1","citation":{"mla":"Claes, Leander, et al. “A Model for Heat Generation by Acoustic Waves in Piezoelectric Materials: Global Large-Data Solutions.” Mathematical Models and Methods in Applied Sciences, vol. 35, no. 11, World Scientific Pub Co Pte Ltd, 2025, pp. 2465–512, doi:10.1142/s0218202525500447.","ama":"Claes L, Lankeit J, Winkler M. A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions. Mathematical Models and Methods in Applied Sciences. 2025;35(11):2465-2512. doi:10.1142/s0218202525500447","bibtex":"@article{Claes_Lankeit_Winkler_2025, title={A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions}, volume={35}, DOI={10.1142/s0218202525500447}, number={11}, journal={Mathematical Models and Methods in Applied Sciences}, publisher={World Scientific Pub Co Pte Ltd}, author={Claes, Leander and Lankeit, Johannes and Winkler, Michael}, year={2025}, pages={2465–2512} }","apa":"Claes, L., Lankeit, J., & Winkler, M. (2025). A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions. Mathematical Models and Methods in Applied Sciences, 35(11), 2465–2512. https://doi.org/10.1142/s0218202525500447","ieee":"L. Claes, J. Lankeit, and M. Winkler, “A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions,” Mathematical Models and Methods in Applied Sciences, vol. 35, no. 11, pp. 2465–2512, 2025, doi: 10.1142/s0218202525500447.","short":"L. Claes, J. Lankeit, M. Winkler, Mathematical Models and Methods in Applied Sciences 35 (2025) 2465–2512.","chicago":"Claes, Leander, Johannes Lankeit, and Michael Winkler. “A Model for Heat Generation by Acoustic Waves in Piezoelectric Materials: Global Large-Data Solutions.” Mathematical Models and Methods in Applied Sciences 35, no. 11 (2025): 2465–2512. https://doi.org/10.1142/s0218202525500447."},"project":[{"_id":"245","name":"FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)"}]},{"status":"public","year":"2025","title":"Estimation of piezoelectric material parameters under varying electric field conditions","author":[{"full_name":"Friesen, Olga","last_name":"Friesen","first_name":"Olga","id":"44026"},{"full_name":"Meihost, Lars","last_name":"Meihost","first_name":"Lars","id":"24769"},{"last_name":"Koch","first_name":"Kevin","full_name":"Koch, Kevin"},{"full_name":"Claes, Leander","orcid":"0000-0002-4393-268X","last_name":"Claes","first_name":"Leander","id":"11829"},{"id":"213","last_name":"Henning","first_name":"Bernd","full_name":"Henning, Bernd"}],"conference":{"location":"Copenhagen","name":"DAS | DAGA 2025 - 51st Annual Meeting on Acoustics","start_date":"2025-03-17","end_date":"2025-03-20"},"date_updated":"2026-01-05T08:02:20Z","main_file_link":[{"open_access":"1"}],"_id":"59689","language":[{"iso":"eng"}],"user_id":"11829","doi":"10.71568/DASDAGA2025.078","citation":{"mla":"Friesen, Olga, et al. Estimation of Piezoelectric Material Parameters under Varying Electric Field Conditions. 2025, doi:10.71568/DASDAGA2025.078.","bibtex":"@inproceedings{Friesen_Meihost_Koch_Claes_Henning_2025, title={Estimation of piezoelectric material parameters under varying electric field conditions}, DOI={10.71568/DASDAGA2025.078}, author={Friesen, Olga and Meihost, Lars and Koch, Kevin and Claes, Leander and Henning, Bernd}, year={2025} }","ama":"Friesen O, Meihost L, Koch K, Claes L, Henning B. Estimation of piezoelectric material parameters under varying electric field conditions. In: ; 2025. doi:10.71568/DASDAGA2025.078","ieee":"O. Friesen, L. Meihost, K. Koch, L. Claes, and B. Henning, “Estimation of piezoelectric material parameters under varying electric field conditions,” presented at the DAS | DAGA 2025 - 51st Annual Meeting on Acoustics, Copenhagen, 2025, doi: 10.71568/DASDAGA2025.078.","apa":"Friesen, O., Meihost, L., Koch, K., Claes, L., & Henning, B. (2025). Estimation of piezoelectric material parameters under varying electric field conditions. DAS | DAGA 2025 - 51st Annual Meeting on Acoustics, Copenhagen. https://doi.org/10.71568/DASDAGA2025.078","short":"O. Friesen, L. Meihost, K. Koch, L. Claes, B. Henning, in: 2025.","chicago":"Friesen, Olga, Lars Meihost, Kevin Koch, Leander Claes, and Bernd Henning. “Estimation of Piezoelectric Material Parameters under Varying Electric Field Conditions,” 2025. https://doi.org/10.71568/DASDAGA2025.078."},"project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)","_id":"245"}],"date_created":"2025-04-25T08:51:32Z","type":"conference","department":[{"_id":"49"}],"oa":"1"},{"publication":"International Journal of Hydrogen Energy","type":"journal_article","department":[{"_id":"876"},{"_id":"9"},{"_id":"393"},{"_id":"321"}],"date_created":"2025-03-18T08:57:46Z","publication_status":"published","date_updated":"2026-01-06T08:01:01Z","intvolume":" 116","title":"Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany","year":"2025","publication_identifier":{"issn":["0360-3199"]},"author":[{"full_name":"Seeger, Karl","last_name":"Seeger","first_name":"Karl"},{"first_name":"Matteo","last_name":"Genovese","full_name":"Genovese, Matteo"},{"id":"103302","full_name":"Schlüter, Alexander","last_name":"Schlüter","first_name":"Alexander","orcid":"0000-0002-2569-1624"},{"last_name":"Kockel","first_name":"Christina","full_name":"Kockel, Christina"},{"full_name":"Corigliano, Orlando","first_name":"Orlando","last_name":"Corigliano"},{"id":"105704","full_name":"Díaz Canales, Edith Benjamina","first_name":"Edith Benjamina","orcid":"0009-0007-2748-0074","last_name":"Díaz Canales"},{"last_name":"Praktiknjo","first_name":"Aaron","full_name":"Praktiknjo, Aaron"},{"first_name":"Petronilla","last_name":"Fragiacomo","full_name":"Fragiacomo, Petronilla"}],"doi":"10.1016/j.ijhydene.2025.02.379","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1016/j.ijhydene.2025.02.379"}],"language":[{"iso":"eng"}],"quality_controlled":"1","citation":{"ama":"Seeger K, Genovese M, Schlüter A, et al. Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany. International Journal of Hydrogen Energy. 2025;116:558-576. doi:10.1016/j.ijhydene.2025.02.379","bibtex":"@article{Seeger_Genovese_Schlüter_Kockel_Corigliano_Díaz Canales_Praktiknjo_Fragiacomo_2025, title={Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany}, volume={116}, DOI={10.1016/j.ijhydene.2025.02.379}, journal={International Journal of Hydrogen Energy}, publisher={Elsevier BV}, author={Seeger, Karl and Genovese, Matteo and Schlüter, Alexander and Kockel, Christina and Corigliano, Orlando and Díaz Canales, Edith Benjamina and Praktiknjo, Aaron and Fragiacomo, Petronilla}, year={2025}, pages={558–576} }","mla":"Seeger, Karl, et al. “Techno-Economic Analysis of Hydrogen and Green Fuels Supply Scenarios Assessing Three Import Routes: Canada, Chile, and Algeria to Germany.” International Journal of Hydrogen Energy, vol. 116, Elsevier BV, 2025, pp. 558–76, doi:10.1016/j.ijhydene.2025.02.379.","chicago":"Seeger, Karl, Matteo Genovese, Alexander Schlüter, Christina Kockel, Orlando Corigliano, Edith Benjamina Díaz Canales, Aaron Praktiknjo, and Petronilla Fragiacomo. “Techno-Economic Analysis of Hydrogen and Green Fuels Supply Scenarios Assessing Three Import Routes: Canada, Chile, and Algeria to Germany.” International Journal of Hydrogen Energy 116 (2025): 558–76. https://doi.org/10.1016/j.ijhydene.2025.02.379.","short":"K. Seeger, M. Genovese, A. Schlüter, C. Kockel, O. Corigliano, E.B. Díaz Canales, A. Praktiknjo, P. Fragiacomo, International Journal of Hydrogen Energy 116 (2025) 558–576.","apa":"Seeger, K., Genovese, M., Schlüter, A., Kockel, C., Corigliano, O., Díaz Canales, E. B., Praktiknjo, A., & Fragiacomo, P. (2025). Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany. International Journal of Hydrogen Energy, 116, 558–576. https://doi.org/10.1016/j.ijhydene.2025.02.379","ieee":"K. Seeger et al., “Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany,” International Journal of Hydrogen Energy, vol. 116, pp. 558–576, 2025, doi: 10.1016/j.ijhydene.2025.02.379."},"oa":"1","status":"public","user_id":"103302","volume":116,"page":"558-576","_id":"59056","publisher":"Elsevier BV"},{"date_created":"2025-07-30T11:04:28Z","keyword":["Sustainable debonding","Structural adhesives","Sustainable joining technologies","Life Cycle Assessment (LCA)","Automotive repair process","Economically efficient debonding"],"type":"journal_article","department":[{"_id":"157"},{"_id":"876"},{"_id":"321"},{"_id":"9"}],"publication":"Journal of Advanced Joining Processes","abstract":[{"lang":"eng","text":"In light of growing demands for resource efficiency and sustainability in vehicle engineering, the environmentally compatible separation of structural adhesive joints is gaining increasing relevance. This study presents a comparative analysis of two physically based debonding methods: the established hot-air process and a cryogenic cold process based on liquid nitrogen (LN2). The primary objective is to assess the ecological impact and process-related sustainability of both approaches.\r\nExperimental investigations were conducted on a component-representative triple-sheet structure that simulates common automotive flange joints. Thermal input was applied either by convective heating using a hot air gun or by direct cooling through a contact-based LN2 tool. The resulting temperature profiles were recorded using spatially distributed thermocouples. Subsequently, the outer panel was selectively debonded to replicate a repair scenario, and the mechanical integrity of the remaining adhesive joint was evaluated through Mode I testing of L-shaped specimens. Process data served as input for an Life Cycle Assessment (LCA) according to DIN EN ISO 14040.\r\nThe cryogenic method achieved a 40% reduction in carbon footprint compared to the hot-air process (0.337 kg vs. 0.559 kg CO2-equivalents), primarily due to its shorter process time and more efficient heat transfer. While the hot-air method’s impact is mainly driven by electrical energy use, that of the cold method stems from cryogenic media consumption. Notwithstanding certain disadvantages in specific impact categories, the LN2-based process exhibits a superior overall ecological performance and signifies a promising solution for repair- and recycling-oriented adhesive separation in structural vehicle applications."}],"main_file_link":[{"url":"https://www.sciencedirect.com/science/article/pii/S2666330925000536?via%3Dihub","open_access":"1"}],"article_number":"100332","language":[{"iso":"eng"}],"doi":"10.1016/j.jajp.2025.100332","title":"Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills","year":"2025","publication_identifier":{"issn":["2666-3309"]},"author":[{"id":"62451","full_name":"Jordan, Alex","last_name":"Jordan","first_name":"Alex","orcid":"0009-0007-9546-6071"},{"id":"58649","last_name":"Hermelingmeier","first_name":"Lucas","full_name":"Hermelingmeier, Lucas"},{"first_name":"Julian","last_name":"Gilich","full_name":"Gilich, Julian","id":"44391"},{"full_name":"Meschut, Gerson","orcid":"0000-0002-2763-1246","first_name":"Gerson","last_name":"Meschut","id":"32056"},{"full_name":"De Santis, Marco Sebastian","last_name":"De Santis","first_name":"Marco Sebastian","id":"52239"},{"first_name":"Alexander","last_name":"Schlüter","orcid":"0000-0002-2569-1624","full_name":"Schlüter, Alexander","id":"103302"}],"date_updated":"2026-01-06T08:22:54Z","publication_status":"published","intvolume":" 12","article_type":"original","oa":"1","citation":{"mla":"Jordan, Alex, et al. “Comparison of the Economic Efficiency and Sustainability of Two Debonding Processes for Structurally Bonded Sills.” Journal of Advanced Joining Processes, vol. 12, 100332, Elsevier, 2025, doi:10.1016/j.jajp.2025.100332.","bibtex":"@article{Jordan_Hermelingmeier_Gilich_Meschut_De Santis_Schlüter_2025, title={Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills}, volume={12}, DOI={10.1016/j.jajp.2025.100332}, number={100332}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier}, author={Jordan, Alex and Hermelingmeier, Lucas and Gilich, Julian and Meschut, Gerson and De Santis, Marco Sebastian and Schlüter, Alexander}, year={2025} }","ama":"Jordan A, Hermelingmeier L, Gilich J, Meschut G, De Santis MS, Schlüter A. Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills. Journal of Advanced Joining Processes. 2025;12. doi:10.1016/j.jajp.2025.100332","ieee":"A. Jordan, L. Hermelingmeier, J. Gilich, G. Meschut, M. S. De Santis, and A. Schlüter, “Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills,” Journal of Advanced Joining Processes, vol. 12, Art. no. 100332, 2025, doi: 10.1016/j.jajp.2025.100332.","apa":"Jordan, A., Hermelingmeier, L., Gilich, J., Meschut, G., De Santis, M. S., & Schlüter, A. (2025). Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills. Journal of Advanced Joining Processes, 12, Article 100332. https://doi.org/10.1016/j.jajp.2025.100332","short":"A. Jordan, L. Hermelingmeier, J. Gilich, G. Meschut, M.S. De Santis, A. Schlüter, Journal of Advanced Joining Processes 12 (2025).","chicago":"Jordan, Alex, Lucas Hermelingmeier, Julian Gilich, Gerson Meschut, Marco Sebastian De Santis, and Alexander Schlüter. “Comparison of the Economic Efficiency and Sustainability of Two Debonding Processes for Structurally Bonded Sills.” Journal of Advanced Joining Processes 12 (2025). https://doi.org/10.1016/j.jajp.2025.100332."},"quality_controlled":"1","_id":"60837","publisher":"Elsevier","user_id":"103302","volume":12,"status":"public"},{"date_created":"2025-12-18T12:14:12Z","department":[{"_id":"146"},{"_id":"158"}],"keyword":["Additive Fertigung","Elektromotor","Leichtbau","Synchronmotor","DFG"],"type":"report","abstract":[{"text":"Die DFG-Projekte AddFeRo-PM (406108415) und AddFeRo-SR (465089065) untersuchten die Potenziale des LB-PBF/M-Verfahrens zur Herstellung von Rotoren für unterschiedliche elektrische Maschinen. Im interdisziplinären Ansatz wurden Materialentwicklung und mechanische sowie elektromagnetische Optimierung verbunden. Im Projekt „AddFeRo-PM“ wurde der Rotor einer permanentmagneterregten Synchron- maschine (PMSM) untersucht. FeSi erwies sich als geeignete Legierung, konnte aber wegen Spannungsrissen nur bis zu 3 % Siliziumanteil (kurz: FeSi3) verarbeitet werden. Mechanische und elektromagnetische Untersuchungen ermöglichten eine 3D-Optimierung der Rotorgeometrie und -struktur. Der Demonstrator wurde additiv gefertigt und zeigt Leicht-baupotenziale sowie reduzierte Drehmomentwelligkeit. Im Folgeprojekt „AddFeRo-SR“ kam eine Hochtemperatur-Bauraumheizung (HTBH) zum Einsatz, die FeSi mit 6,5 % Siliziumanteil verarbeitbar machte, welches bessere elektro- magnetische Eigenschaften bietet. Sie wurde bei einer Synchron-Reluktanzmaschine (SynRM) getestet. Eine hybride Rotorfertigung erwies sich jedoch aufgrund von HTBH-Einschränkungen als ungeeignet, weshalb eine einteilige Fertigung mit FeSi3 umgesetzt wurde. Experimente bestätigten vergleichbare Betriebsergebnisse zur konventionellen Fertigung bei reduzierter Rotormasse. Zusätzlich wurde eine Methodik entwickelt, um additive Verfahren als Ergänzung zur konventionellen Fertigung zu integrieren. Beide Projekte zeigen das Potenzial additiver Fertigung für Leichtbau und Wirkungsgradsteigerung im Elektromaschinenbau und bieten wertvolle Grundlagen für industrielle Anwendungen.","lang":"ger"}],"language":[{"iso":"ger"}],"main_file_link":[{"open_access":"1","url":"https://oa.tib.eu/renate/bitstreams/9121e5bb-d113-4cfe-8fc6-610465afcd66/download"}],"doi":"10.34657/26753","author":[{"id":"35970","full_name":"Haase, Michael","first_name":"Michael","last_name":"Haase"},{"last_name":"Behrendt","first_name":"Marius","full_name":"Behrendt, Marius"},{"full_name":"Hengsbach, Florian","first_name":"Florian","last_name":"Hengsbach","id":"14073"},{"id":"60979","last_name":"Kunnathully Sathees Kumar","first_name":"Vinay","full_name":"Kunnathully Sathees Kumar, Vinay"},{"first_name":"Sebastian","last_name":"Magerkohl","full_name":"Magerkohl, Sebastian","id":"28520"},{"last_name":"Magyar","first_name":"Balázs","full_name":"Magyar, Balázs","id":"97759"},{"first_name":"Bernd","last_name":"Ponick","full_name":"Ponick, Bernd"},{"id":"43720","full_name":"Schaper, Mirko","last_name":"Schaper","first_name":"Mirko"},{"id":"604","full_name":"Zimmer, Detmar","first_name":"Detmar","last_name":"Zimmer"}],"year":"2025","title":"Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen","date_updated":"2026-01-06T08:09:33Z","publication_status":"published","place":"Hannover","oa":"1","citation":{"apa":"Haase, M., Behrendt, M., Hengsbach, F., Kunnathully Sathees Kumar, V., Magerkohl, S., Magyar, B., Ponick, B., Schaper, M., & Zimmer, D. (2025). Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Technische Informationsbibliothek. https://doi.org/10.34657/26753","ieee":"M. Haase et al., Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Hannover: Technische Informationsbibliothek, 2025.","chicago":"Haase, Michael, Marius Behrendt, Florian Hengsbach, Vinay Kunnathully Sathees Kumar, Sebastian Magerkohl, Balázs Magyar, Bernd Ponick, Mirko Schaper, and Detmar Zimmer. Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Hannover: Technische Informationsbibliothek, 2025. https://doi.org/10.34657/26753.","short":"M. Haase, M. Behrendt, F. Hengsbach, V. Kunnathully Sathees Kumar, S. Magerkohl, B. Magyar, B. Ponick, M. Schaper, D. Zimmer, Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen, Technische Informationsbibliothek, Hannover, 2025.","mla":"Haase, Michael, et al. Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Technische Informationsbibliothek, 2025, doi:10.34657/26753.","ama":"Haase M, Behrendt M, Hengsbach F, et al. Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Technische Informationsbibliothek; 2025. doi:10.34657/26753","bibtex":"@book{Haase_Behrendt_Hengsbach_Kunnathully Sathees Kumar_Magerkohl_Magyar_Ponick_Schaper_Zimmer_2025, place={Hannover}, title={Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen}, DOI={10.34657/26753}, publisher={Technische Informationsbibliothek}, author={Haase, Michael and Behrendt, Marius and Hengsbach, Florian and Kunnathully Sathees Kumar, Vinay and Magerkohl, Sebastian and Magyar, Balázs and Ponick, Bernd and Schaper, Mirko and Zimmer, Detmar}, year={2025} }"},"_id":"63209","publisher":"Technische Informationsbibliothek","user_id":"97759","status":"public","has_accepted_license":"1"},{"oa":"1","type":"conference","date_created":"2025-10-08T11:02:30Z","place":"Abu Dhabi, UAE","abstract":[{"lang":"eng","text":"This paper presents LOLA, a massively multilingual large language model trained on more than 160 languages using a sparse Mixture-of-Experts Transformer architecture. Our architectural and implementation choices address the challenge of harnessing linguistic diversity while maintaining efficiency and avoiding the common pitfalls of multilinguality. Our analysis of the evaluation results shows competitive performance in natural language generation and understanding tasks. Additionally, we demonstrate how the learned expert-routing mechanism exploits implicit phylogenetic linguistic patterns to potentially alleviate the curse of multilinguality. We provide an in-depth look at the training process, an analysis of the datasets, and a balanced exploration of the model{’}s strengths and limitations. As an open-source model, LOLA promotes reproducibility and serves as a robust foundation for future research. Our findings enable the development of compute-efficient multilingual models with strong, scalable performance across languages."}],"citation":{"mla":"Srivastava, Nikit, et al. “LOLA – An Open-Source Massively Multilingual Large Language Model.” Proceedings of the 31st International Conference on Computational Linguistics, edited by Owen Rambow et al., Association for Computational Linguistics, 2025, pp. 6420–6446.","apa":"Srivastava, N., Kuchelev, D., Moteu Ngoli, T., Shetty, K., Röder, M., Zahera, H. M. A., Moussallem, D., & Ngonga Ngomo, A.-C. (2025). LOLA – An Open-Source Massively Multilingual Large Language Model. In O. Rambow, L. Wanner, M. Apidianaki, H. Al-Khalifa, B. D. Eugenio, & S. Schockaert (Eds.), Proceedings of the 31st International Conference on Computational Linguistics (pp. 6420–6446). Association for Computational Linguistics.","ieee":"N. Srivastava et al., “LOLA – An Open-Source Massively Multilingual Large Language Model,” in Proceedings of the 31st International Conference on Computational Linguistics, 2025, pp. 6420–6446.","short":"N. Srivastava, D. Kuchelev, T. Moteu Ngoli, K. Shetty, M. Röder, H.M.A. Zahera, D. Moussallem, A.-C. Ngonga Ngomo, in: O. Rambow, L. Wanner, M. Apidianaki, H. Al-Khalifa, B.D. Eugenio, S. Schockaert (Eds.), Proceedings of the 31st International Conference on Computational Linguistics, Association for Computational Linguistics, Abu Dhabi, UAE, 2025, pp. 6420–6446.","ama":"Srivastava N, Kuchelev D, Moteu Ngoli T, et al. LOLA – An Open-Source Massively Multilingual Large Language Model. In: Rambow O, Wanner L, Apidianaki M, Al-Khalifa H, Eugenio BD, Schockaert S, eds. Proceedings of the 31st International Conference on Computational Linguistics. Association for Computational Linguistics; 2025:6420–6446.","chicago":"Srivastava, Nikit, Denis Kuchelev, Tatiana Moteu Ngoli, Kshitij Shetty, Michael Röder, Hamada Mohamed Abdelsamee Zahera, Diego Moussallem, and Axel-Cyrille Ngonga Ngomo. “LOLA – An Open-Source Massively Multilingual Large Language Model.” In Proceedings of the 31st International Conference on Computational Linguistics, edited by Owen Rambow, Leo Wanner, Marianna Apidianaki, Hend Al-Khalifa, Barbara Di Eugenio, and Steven Schockaert, 6420–6446. Abu Dhabi, UAE: Association for Computational Linguistics, 2025.","bibtex":"@inproceedings{Srivastava_Kuchelev_Moteu Ngoli_Shetty_Röder_Zahera_Moussallem_Ngonga Ngomo_2025, place={Abu Dhabi, UAE}, title={LOLA – An Open-Source Massively Multilingual Large Language Model}, booktitle={Proceedings of the 31st International Conference on Computational Linguistics}, publisher={Association for Computational Linguistics}, author={Srivastava, Nikit and Kuchelev, Denis and Moteu Ngoli, Tatiana and Shetty, Kshitij and Röder, Michael and Zahera, Hamada Mohamed Abdelsamee and Moussallem, Diego and Ngonga Ngomo, Axel-Cyrille}, editor={Rambow, Owen and Wanner, Leo and Apidianaki, Marianna and Al-Khalifa, Hend and Eugenio, Barbara Di and Schockaert, Steven}, year={2025}, pages={6420–6446} }"},"publication":"Proceedings of the 31st International Conference on Computational Linguistics","editor":[{"last_name":"Rambow","first_name":"Owen","full_name":"Rambow, Owen"},{"first_name":"Leo","last_name":"Wanner","full_name":"Wanner, Leo"},{"full_name":"Apidianaki, Marianna","last_name":"Apidianaki","first_name":"Marianna"},{"full_name":"Al-Khalifa, Hend","last_name":"Al-Khalifa","first_name":"Hend"},{"full_name":"Eugenio, Barbara Di","last_name":"Eugenio","first_name":"Barbara Di"},{"first_name":"Steven","last_name":"Schockaert","full_name":"Schockaert, Steven"}],"user_id":"70066","_id":"61753","publisher":"Association for Computational Linguistics","language":[{"iso":"eng"}],"page":"6420–6446","main_file_link":[{"open_access":"1","url":"https://aclanthology.org/2025.coling-main.428.pdf"}],"date_updated":"2026-01-06T10:11:37Z","author":[{"full_name":"Srivastava, Nikit","last_name":"Srivastava","first_name":"Nikit","orcid":"0009-0004-5164-4911","id":"70066"},{"id":"70842","first_name":"Denis","last_name":"Kuchelev","full_name":"Kuchelev, Denis"},{"id":"99174","first_name":"Tatiana","last_name":"Moteu Ngoli","full_name":"Moteu Ngoli, Tatiana"},{"last_name":"Shetty","first_name":"Kshitij","full_name":"Shetty, Kshitij"},{"full_name":"Röder, Michael","orcid":"https://orcid.org/0000-0002-8609-8277","first_name":"Michael","last_name":"Röder","id":"67199"},{"first_name":"Hamada Mohamed Abdelsamee","last_name":"Zahera","orcid":"0000-0003-0215-1278","full_name":"Zahera, Hamada Mohamed Abdelsamee","id":"72768"},{"id":"71635","full_name":"Moussallem, Diego","last_name":"Moussallem","first_name":"Diego"},{"id":"65716","full_name":"Ngonga Ngomo, Axel-Cyrille","first_name":"Axel-Cyrille","last_name":"Ngonga Ngomo"}],"title":"LOLA – An Open-Source Massively Multilingual Large Language Model","status":"public","year":"2025"},{"doi":"10.1364/oe.571605","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1","url":"https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-25-52729"}],"article_number":"52729","intvolume":" 33","article_type":"original","date_updated":"2026-01-07T11:28:35Z","publication_status":"published","author":[{"full_name":"Babel, Silia","first_name":"Silia","orcid":"https://orcid.org/0000-0002-1568-2580","last_name":"Babel","id":"63231"},{"id":"61375","last_name":"Bollmers","first_name":"Laura","full_name":"Bollmers, Laura"},{"first_name":"Franz","last_name":"Roeder","full_name":"Roeder, Franz","id":"88149"},{"id":"63574","full_name":"Ridder, Werner","last_name":"Ridder","first_name":"Werner"},{"id":"40420","last_name":"Golla","first_name":"Christian","full_name":"Golla, Christian"},{"full_name":"Köthemann, Ronja","first_name":"Ronja","last_name":"Köthemann"},{"id":"29821","full_name":"Reineke, Bernhard","first_name":"Bernhard","last_name":"Reineke"},{"id":"216","full_name":"Herrmann, Harald","first_name":"Harald","last_name":"Herrmann"},{"orcid":"0000-0003-4140-0556 ","first_name":"Benjamin","last_name":"Brecht","full_name":"Brecht, Benjamin","id":"27150"},{"id":"13244","last_name":"Eigner","first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","full_name":"Eigner, Christof"},{"id":"40300","first_name":"Laura","last_name":"Padberg","full_name":"Padberg, Laura"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"}],"publication_identifier":{"issn":["1094-4087"]},"title":"Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths","year":"2025","department":[{"_id":"288"},{"_id":"623"}],"type":"journal_article","date_created":"2025-12-15T07:20:36Z","abstract":[{"lang":"eng","text":"We present the design and characterization of a guided-wave, bright, and highly frequency non-degenerate parametric down-conversion (PDC) source in thin-film lithium niobate. The source generates photon pairs with wavelengths of 815 nm and 1550 nm, linking the visible wavelength regime with telecommunication wavelengths. We confirm the high quality of the generated single photons by determining a value for the heralded second-order correlation function as low as g_h^(2)=(6.7+/-1.1)*10^8-3). Furthermore, we achieve a high spectral brightness of 0.44·10pairs/(smWGHz) which is two orders of magnitude higher than sources based on weakly guiding waveguides. The shape of the PDC spectrum and the strong agreement between the effective and nominal bandwidth highlight our high fabrication quality of periodically poled waveguides. The good agreement between the measured and simulated spectral characteristics of our source demonstrates our excellent understanding of the PDC process. Our result is a valuable step towards practical and scalable quantum communication networks as well as photonic quantum computing."}],"issue":"25","publication":"Optics Express","volume":33,"user_id":"63231","_id":"63091","publisher":"Optica Publishing Group","status":"public","oa":"1","citation":{"bibtex":"@article{Babel_Bollmers_Roeder_Ridder_Golla_Köthemann_Reineke_Herrmann_Brecht_Eigner_et al._2025, title={Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths}, volume={33}, DOI={10.1364/oe.571605}, number={2552729}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Babel, Silia and Bollmers, Laura and Roeder, Franz and Ridder, Werner and Golla, Christian and Köthemann, Ronja and Reineke, Bernhard and Herrmann, Harald and Brecht, Benjamin and Eigner, Christof and et al.}, year={2025} }","ama":"Babel S, Bollmers L, Roeder F, et al. Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express. 2025;33(25). doi:10.1364/oe.571605","mla":"Babel, Silia, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express, vol. 33, no. 25, 52729, Optica Publishing Group, 2025, doi:10.1364/oe.571605.","chicago":"Babel, Silia, Laura Bollmers, Franz Roeder, Werner Ridder, Christian Golla, Ronja Köthemann, Bernhard Reineke, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express 33, no. 25 (2025). https://doi.org/10.1364/oe.571605.","short":"S. Babel, L. Bollmers, F. Roeder, W. Ridder, C. Golla, R. Köthemann, B. Reineke, H. Herrmann, B. Brecht, C. Eigner, L. Padberg, C. Silberhorn, Optics Express 33 (2025).","ieee":"S. Babel et al., “Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths,” Optics Express, vol. 33, no. 25, Art. no. 52729, 2025, doi: 10.1364/oe.571605.","apa":"Babel, S., Bollmers, L., Roeder, F., Ridder, W., Golla, C., Köthemann, R., Reineke, B., Herrmann, H., Brecht, B., Eigner, C., Padberg, L., & Silberhorn, C. (2025). Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express, 33(25), Article 52729. https://doi.org/10.1364/oe.571605"}},{"status":"public","publisher":"Walter de Gruyter GmbH","_id":"62713","page":"4761","volume":14,"user_id":"22501","citation":{"mla":"Bollmers, Laura, et al. “Segmented Finger Electrodes to Optimize Ultra-Long Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics, vol. 14, Walter de Gruyter GmbH, 2025, p. 4761, doi:10.1515/nanoph-2025-0461.","bibtex":"@article{Bollmers_Spiegelberg_Rüsing_Eigner_Padberg_Silberhorn_2025, title={Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate}, volume={14}, DOI={10.1515/nanoph-2025-0461}, journal={Nanophotonics}, publisher={Walter de Gruyter GmbH}, author={Bollmers, Laura and Spiegelberg, Noah and Rüsing, Michael and Eigner, Christof and Padberg, Laura and Silberhorn, Christine}, year={2025}, pages={4761} }","ama":"Bollmers L, Spiegelberg N, Rüsing M, Eigner C, Padberg L, Silberhorn C. Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate. Nanophotonics. 2025;14:4761. doi:10.1515/nanoph-2025-0461","ieee":"L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, and C. Silberhorn, “Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate,” Nanophotonics, vol. 14, p. 4761, 2025, doi: 10.1515/nanoph-2025-0461.","apa":"Bollmers, L., Spiegelberg, N., Rüsing, M., Eigner, C., Padberg, L., & Silberhorn, C. (2025). Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate. Nanophotonics, 14, 4761. https://doi.org/10.1515/nanoph-2025-0461","short":"L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, C. Silberhorn, Nanophotonics 14 (2025) 4761.","chicago":"Bollmers, Laura, Noah Spiegelberg, Michael Rüsing, Christof Eigner, Laura Padberg, and Christine Silberhorn. “Segmented Finger Electrodes to Optimize Ultra-Long Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics 14 (2025): 4761. https://doi.org/10.1515/nanoph-2025-0461."},"quality_controlled":"1","oa":"1","author":[{"full_name":"Bollmers, Laura","last_name":"Bollmers","first_name":"Laura","id":"61375"},{"first_name":"Noah","last_name":"Spiegelberg","full_name":"Spiegelberg, Noah"},{"full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","first_name":"Michael","last_name":"Rüsing","id":"22501"},{"id":"13244","full_name":"Eigner, Christof","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","last_name":"Eigner"},{"full_name":"Padberg, Laura","first_name":"Laura","last_name":"Padberg","id":"40300"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"}],"publication_identifier":{"issn":["2192-8606","2192-8614"]},"year":"2025","title":"Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate","article_type":"original","intvolume":" 14","publication_status":"published","date_updated":"2026-01-07T12:06:29Z","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1","url":"https://doi.org/10.1515/nanoph-2025-0461"}],"doi":"10.1515/nanoph-2025-0461","publication":"Nanophotonics","abstract":[{"text":"Periodically poled thin-film lithium niobate (TFLN) crystals are the fundamental building block for highly-efficient quantum light sources and frequency converters. The efficiency of these devices is strongly dependent on the interaction length between the light and the nonlinear material, scaling quadratically with this parameter. Nevertheless, the fabrication of long, continuously poled areas in TFLN remains challenging, the length of continuously poled areas rarely exceeds 10 mm. In this work, we demonstrate a significant progress in this field achieving the periodic poling of continuous poled areas of 70 mm length with a 3 μm poling period and a close to 50 % duty cycle. We compare two poling electrode design approaches to fabricate long, continuous poled areas. The first approach involves the poling of a single, continuous 70 mm long electrode. The second utilize a segmented approach including the poling of more than 20 individual sections forming together a 70 mm long poling area with no stitching errors. While the continuous electrode allows for faster fabrication, the segmented approach allows to individually optimize the poling resulting in less duty cycle variation. A detailed analysis of the periodic poling results reveals that the results of both are consistent with previously reported poling outcomes for shorter devices. Thus, we demonstrate wafer-scale periodic poling exceeding chiplet-size without any loss in the periodic poling quality. Our work presents a key step towards highly-efficient, narrow-bandwidth and low-pump power nonlinear optical devices.","lang":"eng"}],"date_created":"2025-12-01T08:45:07Z","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"type":"journal_article"},{"language":[{"iso":"eng"}],"_id":"63524","publisher":"University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences","main_file_link":[{"open_access":"1"}],"doi":"10.62036/isd.2025.68","user_id":"87673","publication_identifier":{"issn":["2938-5202"]},"author":[{"last_name":"Halimeh","first_name":"Haya","full_name":"Halimeh, Haya","id":"87673"},{"full_name":"Freese, Florian","first_name":"Florian","last_name":"Freese"},{"last_name":"Müller","first_name":"Oliver","full_name":"Müller, Oliver"}],"status":"public","title":"LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning","year":"2025","date_updated":"2026-01-07T13:47:43Z","publication_status":"published","date_created":"2026-01-07T13:36:53Z","oa":"1","department":[{"_id":"195"},{"_id":"196"}],"type":"conference","citation":{"bibtex":"@inproceedings{Halimeh_Freese_Müller_2025, title={LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning}, DOI={10.62036/isd.2025.68}, booktitle={International Conference on Information Systems Development}, publisher={University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences}, author={Halimeh, Haya and Freese, Florian and Müller, Oliver}, year={2025} }","ama":"Halimeh H, Freese F, Müller O. LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning. In: International Conference on Information Systems Development. University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences; 2025. doi:10.62036/isd.2025.68","mla":"Halimeh, Haya, et al. “LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning.” International Conference on Information Systems Development, University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences, 2025, doi:10.62036/isd.2025.68.","short":"H. Halimeh, F. Freese, O. Müller, in: International Conference on Information Systems Development, University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences, 2025.","chicago":"Halimeh, Haya, Florian Freese, and Oliver Müller. “LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning.” In International Conference on Information Systems Development. University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences, 2025. https://doi.org/10.62036/isd.2025.68.","ieee":"H. Halimeh, F. Freese, and O. Müller, “LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning,” 2025, doi: 10.62036/isd.2025.68.","apa":"Halimeh, H., Freese, F., & Müller, O. (2025). LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning. International Conference on Information Systems Development. https://doi.org/10.62036/isd.2025.68"},"publication":"International Conference on Information Systems Development","abstract":[{"lang":"eng","text":"Recommendation systems are essential for delivering personalized content across e-commerce and streaming services. However, traditional methods often fail in cold-start scenarios where new items lack prior interactions. Recent advances in large language models (LLMs) offer a promising alternative. In this paper, we adopt the retrieve-and-recommend framework and propose to fine-tune the LLM jointly on warm-and cold-start next-item recommendation tasks, thus, mitigating the need for separate models for both item types. We computationally compare zero-shot prompting, in-context learning, and fine-tuning using the same LLM backbone, and benchmark them against strong PLM-based baselines. Our findings provide practical insights into the trade-offs between accuracy and computational cost of these methods for next-item recommendation. To enhance reproducibility, we release the source code under https://github. com/HayaHalimeh/LLMs-For-Next-Item-Recommendation.git."}]},{"_id":"63523","publisher":"IEEE","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1"}],"user_id":"87673","doi":"10.1109/cbi68102.2025.00019","author":[{"full_name":"Halimeh, Haya","first_name":"Haya","last_name":"Halimeh","id":"87673"},{"id":"64394","full_name":"zur Heiden, Philipp","last_name":"zur Heiden","first_name":"Philipp"}],"title":"Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces","status":"public","year":"2025","publication_status":"published","date_updated":"2026-01-07T13:49:45Z","date_created":"2026-01-07T13:34:02Z","department":[{"_id":"195"},{"_id":"196"}],"oa":"1","type":"conference","citation":{"bibtex":"@inproceedings{Halimeh_zur Heiden_2025, title={Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces}, DOI={10.1109/cbi68102.2025.00019}, booktitle={2025 27th International Conference on Business Informatics (CBI)}, publisher={IEEE}, author={Halimeh, Haya and zur Heiden, Philipp}, year={2025} }","ama":"Halimeh H, zur Heiden P. Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces. In: 2025 27th International Conference on Business Informatics (CBI). IEEE; 2025. doi:10.1109/cbi68102.2025.00019","mla":"Halimeh, Haya, and Philipp zur Heiden. “Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces.” 2025 27th International Conference on Business Informatics (CBI), IEEE, 2025, doi:10.1109/cbi68102.2025.00019.","chicago":"Halimeh, Haya, and Philipp zur Heiden. “Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces.” In 2025 27th International Conference on Business Informatics (CBI). IEEE, 2025. https://doi.org/10.1109/cbi68102.2025.00019.","short":"H. Halimeh, P. zur Heiden, in: 2025 27th International Conference on Business Informatics (CBI), IEEE, 2025.","ieee":"H. Halimeh and P. zur Heiden, “Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces,” 2025, doi: 10.1109/cbi68102.2025.00019.","apa":"Halimeh, H., & zur Heiden, P. (2025). Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces. 2025 27th International Conference on Business Informatics (CBI). https://doi.org/10.1109/cbi68102.2025.00019"},"publication":"2025 27th International Conference on Business Informatics (CBI)","abstract":[{"lang":"eng","text":"Data spaces have become a strategic pillar of Europe's digital agenda, enabling sovereign, legally compliant data sharing within decentralized ecosystems. As data space initiatives evolve, personalized recommendations are increasingly recognized as key use cases. However, traditional recommendation approaches typically rely on centralized aggregation of user behavior data-directly conflicting with the core ethos of data spaces: sovereignty, privacy, and trust. Federated recommendation systems offer a promising alternative by training models locally and exchanging only intermediate parameters to build a global model. Despite this potential, the integration of federated recommendation techniques and data space architectures remains largely underexplored in research and practice. This paper addresses this gap by designing and evaluating a prototype of a federated recommendation system specifically tailored for data spaces and compliant with their underlying infrastructure. Our findings highlight the viability of developing privacy-preserving, collaborative recommendation systems within data spaces, and contribute to the broader adoption of AI across these emerging ecosystems."}]},{"doi":"10.1007/978-3-032-13342-7","user_id":"87673","main_file_link":[{"url":"https://link.springer.com/book/10.1007/978-3-032-13342-7","open_access":"1"}],"_id":"63525","language":[{"iso":"eng"}],"date_updated":"2026-01-07T13:46:50Z","title":"Towards Greener Choices: Decision Information Nudging for Sustainability-Aware Recommender Explanations","status":"public","year":"2025","conference":{"location":"Prague, Czech Republic","name":" The Second International Workshop on Recommender Systems for Sustainability and Social Good, RecSoGood 2025","start_date":"2025-09-26"},"author":[{"id":"87673","first_name":"Haya","last_name":"Halimeh","full_name":"Halimeh, Haya"},{"last_name":"Müller","first_name":"Oliver","full_name":"Müller, Oliver","id":"72849"}],"type":"conference","oa":"1","department":[{"_id":"195"},{"_id":"196"}],"date_created":"2026-01-07T13:40:05Z","abstract":[{"text":"Recommender systems (RS) can support sustainable development by steering users toward more sustainable choices. Sustainability-aware explanations represent one avenue for contributing to this goal by foregrounding the environmental and social aspects of the recommended products or services. This paper advances the line of research on sustainability-aware explanations by integrating nudging mechanisms into their design and by evaluating their effectiveness through a randomized between-subjects online vignette experiment across two item domains (). Our findings offer actionable design guidelines for building RS that foster sustainability-aware decision making and enrich the empirical foundation for impact-oriented research on explanation in RS.\r\n","lang":"eng"}],"citation":{"ieee":"H. Halimeh and O. Müller, “Towards Greener Choices: Decision Information Nudging for Sustainability-Aware Recommender Explanations,” presented at the The Second International Workshop on Recommender Systems for Sustainability and Social Good, RecSoGood 2025, Prague, Czech Republic, 2025, doi: 10.1007/978-3-032-13342-7.","mla":"Halimeh, Haya, and Oliver Müller. Towards Greener Choices: Decision Information Nudging for Sustainability-Aware Recommender Explanations. 2025, doi:10.1007/978-3-032-13342-7.","apa":"Halimeh, H., & Müller, O. (2025). Towards Greener Choices: Decision Information Nudging for Sustainability-Aware Recommender Explanations. The Second International Workshop on Recommender Systems for Sustainability and Social Good, RecSoGood 2025, Prague, Czech Republic. https://doi.org/10.1007/978-3-032-13342-7","bibtex":"@inproceedings{Halimeh_Müller_2025, title={Towards Greener Choices: Decision Information Nudging for Sustainability-Aware Recommender Explanations}, DOI={10.1007/978-3-032-13342-7}, author={Halimeh, Haya and Müller, Oliver}, year={2025} }","short":"H. Halimeh, O. Müller, in: 2025.","ama":"Halimeh H, Müller O. Towards Greener Choices: Decision Information Nudging for Sustainability-Aware Recommender Explanations. 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American Institute of Aeronautics and Astronautics, 2025. https://doi.org/10.2514/6.2025-2083.","mla":"Henkenjohann, Mark, et al. “Dynamic Wind Tunnel Testing of an INDI-Based Flight Controller for a Tiltrotor-VTOL.” AIAA SCITECH 2025 Forum, American Institute of Aeronautics and Astronautics, 2025, doi:10.2514/6.2025-2083.","ama":"Henkenjohann M, Nolte U, Jahneke J, et al. Dynamic Wind Tunnel Testing of an INDI-Based Flight Controller for a Tiltrotor-VTOL. In: AIAA SCITECH 2025 Forum. American Institute of Aeronautics and Astronautics; 2025. doi:10.2514/6.2025-2083","bibtex":"@inproceedings{Henkenjohann_Nolte_Jahneke_Reimer_Abrams_Sion_Henke_Trächtler_Schubert_Pfifer_2025, title={Dynamic Wind Tunnel Testing of an INDI-Based Flight Controller for a Tiltrotor-VTOL}, DOI={10.2514/6.2025-2083}, booktitle={AIAA SCITECH 2025 Forum}, publisher={American Institute of Aeronautics and Astronautics}, author={Henkenjohann, Mark and Nolte, Udo and Jahneke, Julien and Reimer, Oliver and Abrams, Stefan and Sion, Fabian and Henke, Christian and Trächtler, Ansgar and Schubert, Sebastian and Pfifer, Harald}, year={2025} }"},"publication":"AIAA SCITECH 2025 Forum","oa":"1","department":[{"_id":"153"},{"_id":"241"}],"type":"conference","date_created":"2026-01-07T15:43:24Z"},{"date_created":"2026-01-07T15:46:06Z","department":[{"_id":"153"},{"_id":"241"}],"oa":"1","type":"conference","citation":{"ieee":"F. Reiling, M. Bause, S. Gröger, C. Henke, S. Koppert, and A. 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Trächtler, in: 2025 11th International Conference on Automation, Robotics, and Applications (ICARA), IEEE, 2025.","mla":"Reiling, Fabian, et al. “Development of a Learning-Based Control System for Robot-Assisted Grinding of Rubber Roller.” 2025 11th International Conference on Automation, Robotics, and Applications (ICARA), IEEE, 2025, doi:10.1109/icara64554.2025.10977606.","bibtex":"@inproceedings{Reiling_Bause_Gröger_Henke_Koppert_Trächtler_2025, title={Development of a Learning-Based Control System for Robot-Assisted Grinding of Rubber Roller}, DOI={10.1109/icara64554.2025.10977606}, booktitle={2025 11th International Conference on Automation, Robotics, and Applications (ICARA)}, publisher={IEEE}, author={Reiling, Fabian and Bause, Maximilian and Gröger, Stefan and Henke, Christian and Koppert, Steven and Trächtler, Ansgar}, year={2025} }","ama":"Reiling F, Bause M, Gröger S, Henke C, Koppert S, Trächtler A. Development of a Learning-Based Control System for Robot-Assisted Grinding of Rubber Roller. In: 2025 11th International Conference on Automation, Robotics, and Applications (ICARA). IEEE; 2025. doi:10.1109/icara64554.2025.10977606"},"publication":"2025 11th International Conference on Automation, Robotics, and Applications (ICARA)","language":[{"iso":"eng"}],"_id":"63528","publisher":"IEEE","main_file_link":[{"open_access":"1","url":"https://ieeexplore.ieee.org/document/10977606"}],"user_id":"82875","doi":"10.1109/icara64554.2025.10977606","author":[{"last_name":"Reiling","first_name":"Fabian","full_name":"Reiling, Fabian"},{"last_name":"Bause","first_name":"Maximilian","full_name":"Bause, Maximilian"},{"last_name":"Gröger","first_name":"Stefan","full_name":"Gröger, Stefan"},{"first_name":"Christian","last_name":"Henke","full_name":"Henke, Christian"},{"full_name":"Koppert, Steven","first_name":"Steven","last_name":"Koppert"},{"full_name":"Trächtler, Ansgar","first_name":"Ansgar","last_name":"Trächtler"}],"status":"public","title":"Development of a Learning-Based Control System for Robot-Assisted Grinding of Rubber Roller","year":"2025","publication_status":"published","date_updated":"2026-01-07T15:46:51Z"},{"user_id":"96670","doi":"10.1007/s10797-025-09930-8","language":[{"iso":"eng"}],"_id":"46047","main_file_link":[{"url":"https://doi.org/10.1007/s10797-025-09930-8","open_access":"1"}],"publication_status":"published","date_updated":"2026-01-12T12:24:11Z","author":[{"full_name":"Chen, An","last_name":"Chen","first_name":"An"},{"first_name":"Peter","last_name":"Hieber","full_name":"Hieber, Peter"},{"id":"530","full_name":"Sureth-Sloane, Caren","first_name":"Caren","last_name":"Sureth-Sloane","orcid":" 0000-0002-8183-5901"}],"jel":["G11","H25","M41","M42","M48"],"year":"2025","status":"public","title":"How Much to Pay for Tax Certainty? The Role of Advance Tax Rulings for Risky Investment under Loss Offset and Tax Uncertainty","department":[{"_id":"187"}],"oa":"1","type":"working_paper","date_created":"2023-07-13T12:03:15Z","abstract":[{"lang":"eng","text":"This study examines the impact of tax certainty through advance tax rulings (ATRs) on firms' risky investments under cash flow and tax uncertainty. Both firms and governments have expressed growing concern about increasing tax uncertainty, due to frequent tax reforms and the difficulty in applying ambiguous tax laws and anticipating audit outcomes. One remedy is the provision of ATRs, which offer upfront clarification of tax issues to reduce tax uncertainty and increase risk-taking. We analyze how these uncertainties, along with different tax rates, loss offset provisions, and ATR fees affect investment strategies. Our results suggest, first, that ATRs encourage riskier investments, particularly in tax regimes with generous loss offsets. We identify optimal ranges of ATR fees that benefit firms and tax authorities. Second, we show that it may be beneficial to design ATRs with a low or negative fee. Third, our study reveals a U-shaped relationship between firms' risk aversion and their willingness to pay for tax certainty, with willingness being higher for firms at low or high levels of risk aversion. In contrast, moderately risk-averse firms are only willing to accept low fees. Overall, our results highlight the importance of low-cost tax certainty combined with generous loss offset provisions to encourage risky investments."}],"citation":{"ama":"Chen A, Hieber P, Sureth-Sloane C. How Much to Pay for Tax Certainty? The Role of Advance Tax Rulings for Risky Investment under Loss Offset and Tax Uncertainty.; 2025. doi:10.1007/s10797-025-09930-8","bibtex":"@book{Chen_Hieber_Sureth-Sloane_2025, title={How Much to Pay for Tax Certainty? The Role of Advance Tax Rulings for Risky Investment under Loss Offset and Tax Uncertainty}, DOI={10.1007/s10797-025-09930-8}, author={Chen, An and Hieber, Peter and Sureth-Sloane, Caren}, year={2025} }","mla":"Chen, An, et al. How Much to Pay for Tax Certainty? The Role of Advance Tax Rulings for Risky Investment under Loss Offset and Tax Uncertainty. 2025, doi:10.1007/s10797-025-09930-8.","short":"A. Chen, P. Hieber, C. Sureth-Sloane, How Much to Pay for Tax Certainty? The Role of Advance Tax Rulings for Risky Investment under Loss Offset and Tax Uncertainty, 2025.","chicago":"Chen, An, Peter Hieber, and Caren Sureth-Sloane. How Much to Pay for Tax Certainty? The Role of Advance Tax Rulings for Risky Investment under Loss Offset and Tax Uncertainty, 2025. https://doi.org/10.1007/s10797-025-09930-8.","apa":"Chen, A., Hieber, P., & Sureth-Sloane, C. (2025). How Much to Pay for Tax Certainty? The Role of Advance Tax Rulings for Risky Investment under Loss Offset and Tax Uncertainty. https://doi.org/10.1007/s10797-025-09930-8","ieee":"A. Chen, P. Hieber, and C. Sureth-Sloane, How Much to Pay for Tax Certainty? The Role of Advance Tax Rulings for Risky Investment under Loss Offset and Tax Uncertainty. 2025."}},{"main_file_link":[{"url":"https://journals.ub.uni-koeln.de/index.php/mathematica_didactica/article/view/2297","open_access":"1"}],"_id":"63556","language":[{"iso":"ger"}],"user_id":"37888","doi":"10.18716/ojs/md/2025.2297","volume":48,"status":"public","title":"Civic Statistical Literacy: Konzept und praxisnahe Umsetzung am Beispiel des Klimawandels","year":"2025","author":[{"full_name":"Biehler, Rolf","last_name":"Biehler","first_name":"Rolf","id":"16274"},{"first_name":"Joachim","last_name":"Engel","full_name":"Engel, Joachim"},{"full_name":"Frischemeier, Daniel","last_name":"Frischemeier","first_name":"Daniel"},{"last_name":"Podworny","first_name":"Susanne","full_name":"Podworny, Susanne"}],"date_updated":"2026-01-12T11:26:40Z","intvolume":" 48","date_created":"2026-01-12T11:23:57Z","type":"journal_article","department":[{"_id":"363"}],"oa":"1","publication":"mathematica didactica","issue":"2","citation":{"ieee":"R. Biehler, J. Engel, D. Frischemeier, and S. Podworny, “Civic Statistical Literacy: Konzept und praxisnahe Umsetzung am Beispiel des Klimawandels,” mathematica didactica, vol. 48, no. 2, 2025, doi: 10.18716/ojs/md/2025.2297.","apa":"Biehler, R., Engel, J., Frischemeier, D., & Podworny, S. (2025). Civic Statistical Literacy: Konzept und praxisnahe Umsetzung am Beispiel des Klimawandels. mathematica didactica, 48(2). https://doi.org/10.18716/ojs/md/2025.2297","mla":"Biehler, Rolf, et al. “Civic Statistical Literacy: Konzept und praxisnahe Umsetzung am Beispiel des Klimawandels.” mathematica didactica, vol. 48, no. 2, 2025, doi:10.18716/ojs/md/2025.2297.","bibtex":"@article{Biehler_Engel_Frischemeier_Podworny_2025, title={Civic Statistical Literacy: Konzept und praxisnahe Umsetzung am Beispiel des Klimawandels}, volume={48}, DOI={10.18716/ojs/md/2025.2297}, number={2}, journal={mathematica didactica}, author={Biehler, Rolf and Engel, Joachim and Frischemeier, Daniel and Podworny, Susanne}, year={2025} }","short":"R. Biehler, J. Engel, D. Frischemeier, S. Podworny, mathematica didactica 48 (2025).","ama":"Biehler R, Engel J, Frischemeier D, Podworny S. Civic Statistical Literacy: Konzept und praxisnahe Umsetzung am Beispiel des Klimawandels. mathematica didactica. 2025;48(2). doi:10.18716/ojs/md/2025.2297","chicago":"Biehler, Rolf, Joachim Engel, Daniel Frischemeier, and Susanne Podworny. “Civic Statistical Literacy: Konzept und praxisnahe Umsetzung am Beispiel des Klimawandels.” mathematica didactica 48, no. 2 (2025). https://doi.org/10.18716/ojs/md/2025.2297."}},{"date_created":"2026-01-12T13:42:35Z","type":"conference_abstract","oa":"1","department":[{"_id":"172"}],"citation":{"mla":"Piskin, Daghan Yüksel, et al. Exergaming Rejuvenates Resting-State Brain Complexity and Modulates Adaptability During Gameplay in Older Adults: An EEG Multiscale Entropy Study. 2025.","ama":"Piskin DY, Müller HM, Nina Skjæret-Maroni N, Vereijken B, Baumeister J. Exergaming Rejuvenates Resting-State Brain Complexity and Modulates Adaptability During Gameplay in Older Adults: An EEG Multiscale Entropy Study. In: ; 2025.","bibtex":"@inproceedings{Piskin_Müller_Nina Skjæret-Maroni_Vereijken_Baumeister_2025, title={Exergaming Rejuvenates Resting-State Brain Complexity and Modulates Adaptability During Gameplay in Older Adults: An EEG Multiscale Entropy Study}, author={Piskin, Daghan Yüksel and Müller, Helen Martha and Nina Skjæret-Maroni, Nina and Vereijken, Beatrix and Baumeister, Jochen}, year={2025} }","apa":"Piskin, D. Y., Müller, H. M., Nina Skjæret-Maroni, N., Vereijken, B., & Baumeister, J. (2025). Exergaming Rejuvenates Resting-State Brain Complexity and Modulates Adaptability During Gameplay in Older Adults: An EEG Multiscale Entropy Study. International Congress of Human in Motion, Piran, Slowenien.","ieee":"D. Y. Piskin, H. M. Müller, N. Nina Skjæret-Maroni, B. Vereijken, and J. Baumeister, “Exergaming Rejuvenates Resting-State Brain Complexity and Modulates Adaptability During Gameplay in Older Adults: An EEG Multiscale Entropy Study,” presented at the International Congress of Human in Motion, Piran, Slowenien, 2025.","chicago":"Piskin, Daghan Yüksel, Helen Martha Müller, Nina Nina Skjæret-Maroni, Beatrix Vereijken, and Jochen Baumeister. “Exergaming Rejuvenates Resting-State Brain Complexity and Modulates Adaptability During Gameplay in Older Adults: An EEG Multiscale Entropy Study,” 2025.","short":"D.Y. Piskin, H.M. Müller, N. Nina Skjæret-Maroni, B. Vereijken, J. Baumeister, in: 2025."},"main_file_link":[{"url":"https://ichm.zrs-kp.si/wp-content/uploads/sites/3/2025/11/Zbornik-ICHM-2025_ONLINE.pdf","open_access":"1"}],"language":[{"iso":"eng"}],"_id":"63565","user_id":"76790","year":"2025","status":"public","title":"Exergaming Rejuvenates Resting-State Brain Complexity and Modulates Adaptability During Gameplay in Older Adults: An EEG Multiscale Entropy Study","conference":{"end_date":"2025-10-01","location":"Piran, Slowenien","name":"International Congress of Human in Motion","start_date":"2025-09-28"},"author":[{"last_name":"Piskin","first_name":"Daghan Yüksel","orcid":"000-0002-3358-4669","full_name":"Piskin, Daghan Yüksel","id":"76790"},{"full_name":"Müller, Helen Martha","last_name":"Müller","first_name":"Helen Martha","id":"40188"},{"full_name":"Nina Skjæret-Maroni, Nina","last_name":"Nina Skjæret-Maroni","first_name":"Nina"},{"last_name":"Vereijken","first_name":"Beatrix","full_name":"Vereijken, Beatrix"},{"full_name":"Baumeister, Jochen","first_name":"Jochen","orcid":"0000-0003-2683-5826","last_name":"Baumeister","id":"46"}],"date_updated":"2026-01-12T13:42:45Z"},{"title":"Skilled passing in football may regress following an anterior cruciate ligament injury as a result of cortical changes: preliminary EEG evidence","year":"2025","status":"public","author":[{"id":"76790","orcid":"000-0002-3358-4669","first_name":"Daghan Yüksel","last_name":"Piskin","full_name":"Piskin, Daghan Yüksel"},{"last_name":"Cobani","first_name":"Gjergji","full_name":"Cobani, Gjergji"},{"first_name":"Tim","last_name":"Lehmann","full_name":"Lehmann, Tim","id":"41584"},{"id":"41088","full_name":"Büchel, Daniel","last_name":"Büchel","first_name":"Daniel"},{"orcid":"0000-0003-2683-5826","last_name":"Baumeister","first_name":"Jochen","full_name":"Baumeister, Jochen","id":"46"}],"conference":{"location":"Rimini","name":"European Congress of Sport Science ","start_date":"2025-07-01","end_date":"2025-07-04"},"date_updated":"2026-01-12T13:39:02Z","main_file_link":[{"open_access":"1","url":"https://www.ecss.mobi/DATA/CONGRESSES/RIMINI_2025/DOCUMENTS/BOA/RIMINI_BOA_WEB.pdf"}],"language":[{"iso":"eng"}],"_id":"63564","user_id":"76790","citation":{"short":"D.Y. Piskin, G. Cobani, T. Lehmann, D. Büchel, J. Baumeister, in: 2025.","chicago":"Piskin, Daghan Yüksel, Gjergji Cobani, Tim Lehmann, Daniel Büchel, and Jochen Baumeister. “Skilled Passing in Football May Regress Following an Anterior Cruciate Ligament Injury as a Result of Cortical Changes: Preliminary EEG Evidence,” 2025.","ieee":"D. Y. Piskin, G. Cobani, T. Lehmann, D. Büchel, and J. Baumeister, “Skilled passing in football may regress following an anterior cruciate ligament injury as a result of cortical changes: preliminary EEG evidence,” presented at the European Congress of Sport Science , Rimini, 2025.","apa":"Piskin, D. Y., Cobani, G., Lehmann, T., Büchel, D., & Baumeister, J. (2025). Skilled passing in football may regress following an anterior cruciate ligament injury as a result of cortical changes: preliminary EEG evidence. European Congress of Sport Science , Rimini.","bibtex":"@inproceedings{Piskin_Cobani_Lehmann_Büchel_Baumeister_2025, title={Skilled passing in football may regress following an anterior cruciate ligament injury as a result of cortical changes: preliminary EEG evidence}, author={Piskin, Daghan Yüksel and Cobani, Gjergji and Lehmann, Tim and Büchel, Daniel and Baumeister, Jochen}, year={2025} }","ama":"Piskin DY, Cobani G, Lehmann T, Büchel D, Baumeister J. Skilled passing in football may regress following an anterior cruciate ligament injury as a result of cortical changes: preliminary EEG evidence. In: ; 2025.","mla":"Piskin, Daghan Yüksel, et al. Skilled Passing in Football May Regress Following an Anterior Cruciate Ligament Injury as a Result of Cortical Changes: Preliminary EEG Evidence. 2025."},"date_created":"2026-01-12T13:37:31Z","type":"conference_abstract","department":[{"_id":"172"}],"oa":"1"},{"external_id":{"arxiv":["2409.19277"]},"oa":"1","citation":{"ama":"Gerlach R, von der Gracht S, Hahn C, Harbig J, Kling P. Symmetry Preservation in Swarms of Oblivious Robots with Limited Visibility. In: Bonomi S, Galletta L, Rivière Etienne, Schiavoni Valerio, eds. 28th International Conference on Principles of Distributed Systems (OPODIS 2024). Vol 324. Leibniz International Proceedings in Informatics (LIPIcs). Schloss Dagstuhl -- Leibniz-Zentrum für Informatik; 2025. doi:10.4230/LIPIcs.OPODIS.2024.13","bibtex":"@inproceedings{Gerlach_von der Gracht_Hahn_Harbig_Kling_2025, series={Leibniz International Proceedings in Informatics (LIPIcs)}, title={Symmetry Preservation in Swarms of Oblivious Robots with Limited Visibility}, volume={324}, DOI={10.4230/LIPIcs.OPODIS.2024.13}, booktitle={28th International Conference on Principles of Distributed Systems (OPODIS 2024)}, publisher={Schloss Dagstuhl -- Leibniz-Zentrum für Informatik}, author={Gerlach, Raphael and von der Gracht, Sören and Hahn, Christopher and Harbig, Jonas and Kling, Peter}, editor={Bonomi, Silvia and Galletta, Letterio and Rivière, Etienne and Schiavoni, Valerio}, year={2025}, collection={Leibniz International Proceedings in Informatics (LIPIcs)} }","mla":"Gerlach, Raphael, et al. “Symmetry Preservation in Swarms of Oblivious Robots with Limited Visibility.” 28th International Conference on Principles of Distributed Systems (OPODIS 2024), edited by Silvia Bonomi et al., vol. 324, Schloss Dagstuhl -- Leibniz-Zentrum für Informatik, 2025, doi:10.4230/LIPIcs.OPODIS.2024.13.","chicago":"Gerlach, Raphael, Sören von der Gracht, Christopher Hahn, Jonas Harbig, and Peter Kling. “Symmetry Preservation in Swarms of Oblivious Robots with Limited Visibility.” In 28th International Conference on Principles of Distributed Systems (OPODIS 2024), edited by Silvia Bonomi, Letterio Galletta, Etienne Rivière, and Valerio Schiavoni, Vol. 324. Leibniz International Proceedings in Informatics (LIPIcs). Schloss Dagstuhl -- Leibniz-Zentrum für Informatik, 2025. https://doi.org/10.4230/LIPIcs.OPODIS.2024.13.","short":"R. Gerlach, S. von der Gracht, C. Hahn, J. Harbig, P. Kling, in: S. Bonomi, L. Galletta, Etienne Rivière, Valerio Schiavoni (Eds.), 28th International Conference on Principles of Distributed Systems (OPODIS 2024), Schloss Dagstuhl -- Leibniz-Zentrum für Informatik, 2025.","apa":"Gerlach, R., von der Gracht, S., Hahn, C., Harbig, J., & Kling, P. (2025). Symmetry Preservation in Swarms of Oblivious Robots with Limited Visibility. In S. Bonomi, L. Galletta, Etienne Rivière, & Valerio Schiavoni (Eds.), 28th International Conference on Principles of Distributed Systems (OPODIS 2024) (Vol. 324). Schloss Dagstuhl -- Leibniz-Zentrum für Informatik. https://doi.org/10.4230/LIPIcs.OPODIS.2024.13","ieee":"R. Gerlach, S. von der Gracht, C. Hahn, J. Harbig, and P. Kling, “Symmetry Preservation in Swarms of Oblivious Robots with Limited Visibility,” in 28th International Conference on Principles of Distributed Systems (OPODIS 2024), Lucca, Italy, 2025, vol. 324, doi: 10.4230/LIPIcs.OPODIS.2024.13."},"project":[{"name":"Algorithmen für Schwarmrobotik: Verteiltes Rechnen trifft Dynamische Systeme","grant_number":"453112019","_id":"106"}],"_id":"56298","publisher":"Schloss Dagstuhl -- Leibniz-Zentrum für Informatik","volume":324,"editor":[{"full_name":"Bonomi, Silvia","first_name":"Silvia","last_name":"Bonomi"},{"last_name":"Galletta","first_name":"Letterio","full_name":"Galletta, Letterio"},{"full_name":"Rivière, Etienne","last_name":"Rivière","first_name":" Etienne"},{"first_name":" Valerio","last_name":"Schiavoni","full_name":"Schiavoni, Valerio"}],"user_id":"97359","conference":{"end_date":"2024-12-13","name":"28th International Conference on Principles of Distributed Systems (OPODIS 2024)","start_date":"2024-12-11","location":"Lucca, Italy"},"status":"public","date_created":"2024-10-01T13:29:43Z","department":[{"_id":"101"}],"type":"conference","keyword":["Swarm Algorithm","Swarm Robots","Distributed Algorithm","Pattern Formation","Limited Visibility","Oblivious"],"publication":"28th International Conference on Principles of Distributed Systems (OPODIS 2024)","abstract":[{"text":"In the general pattern formation (GPF) problem, a swarm of simple autonomous,\r\ndisoriented robots must form a given pattern. The robots' simplicity imply a\r\nstrong limitation: When the initial configuration is rotationally symmetric,\r\nonly patterns with a similar symmetry can be formed [Yamashita, Suzyuki; TCS\r\n2010]. The only known algorithm to form large patterns with limited visibility\r\nand without memory requires the robots to start in a near-gathering (a swarm of\r\nconstant diameter) [Hahn et al.; SAND 2024]. However, not only do we not know\r\nany near-gathering algorithm guaranteed to preserve symmetry but most natural\r\ngathering strategies trivially increase symmetries [Castenow et al.; OPODIS\r\n2022].\r\n Thus, we study near-gathering without changing the swarm's rotational\r\nsymmetry for disoriented, oblivious robots with limited visibility (the\r\nOBLOT-model, see [Flocchini et al.; 2019]). We introduce a technique based on\r\nthe theory of dynamical systems to analyze how a given algorithm affects\r\nsymmetry and provide sufficient conditions for symmetry preservation. Until\r\nnow, it was unknown whether the considered OBLOT-model allows for any\r\nnon-trivial algorithm that always preserves symmetry. Our first result shows\r\nthat a variant of Go-to-the-Average always preserves symmetry but may sometimes\r\nlead to multiple, unconnected near-gathering clusters. Our second result is a\r\nsymmetry-preserving near-gathering algorithm that works on swarms with a convex\r\nboundary (the outer boundary of the unit disc graph) and without holes (circles\r\nof diameter 1 inside the boundary without any robots).","lang":"eng"}],"language":[{"iso":"eng"}],"series_title":"Leibniz International Proceedings in Informatics (LIPIcs)","main_file_link":[{"url":"https://arxiv.org/abs/2409.19277","open_access":"1"}],"doi":"10.4230/LIPIcs.OPODIS.2024.13","publication_identifier":{"isbn":["978-3-95977-360-7"],"issn":["1868-8969"]},"author":[{"full_name":"Gerlach, Raphael","last_name":"Gerlach","orcid":"0009-0002-4750-2051","first_name":"Raphael","id":"32655"},{"first_name":"Sören","last_name":"von der Gracht","orcid":"0000-0002-8054-2058","full_name":"von der Gracht, Sören","id":"97359"},{"full_name":"Hahn, Christopher","first_name":"Christopher","last_name":"Hahn"},{"id":"47213","full_name":"Harbig, Jonas","last_name":"Harbig","first_name":"Jonas"},{"full_name":"Kling, Peter","last_name":"Kling","first_name":"Peter"}],"title":"Symmetry Preservation in Swarms of Oblivious Robots with Limited Visibility","year":"2025","intvolume":" 324","publication_status":"published","date_updated":"2025-01-09T11:39:19Z"},{"abstract":[{"lang":"eng","text":"We introduce a new classification of multimode states with a fixed number of photons. This classification is based on the factorizability of homogeneous multivariate polynomials and is invariant under unitary transformations. The classes physically correspond to field excitations in terms of single and multiple photons, each of which being in an arbitrary irreducible superposition of quantized modes. We further show how the transitions between classes are rendered possible by photon addition, photon subtraction, and photon-projection nonlinearities. We explicitly put forward a design for a multilayer interferometer in which the states for different classes can be generated with state-of-the-art experimental techniques. Limitations of the proposed designs are analyzed using the introduced classification, providing a benchmark for the robustness of certain states and classes. "}],"citation":{"mla":"Kopylov, Denis, et al. Multiphoton, Multimode State Classification for Nonlinear Optical Circuits .","bibtex":"@article{Kopylov_Offen_Ares_Wembe Moafo_Ober-Blöbaum_Meier_Sharapova_Sperling, title={Multiphoton, multimode state classification for nonlinear optical circuits }, author={Kopylov, Denis and Offen, Christian and Ares, Laura and Wembe Moafo, Boris Edgar and Ober-Blöbaum, Sina and Meier, Torsten and Sharapova, Polina and Sperling, Jan} }","ama":"Kopylov D, Offen C, Ares L, et al. Multiphoton, multimode state classification for nonlinear optical circuits .","ieee":"D. Kopylov et al., “Multiphoton, multimode state classification for nonlinear optical circuits .” .","apa":"Kopylov, D., Offen, C., Ares, L., Wembe Moafo, B. E., Ober-Blöbaum, S., Meier, T., Sharapova, P., & Sperling, J. (n.d.). Multiphoton, multimode state classification for nonlinear optical circuits .","short":"D. Kopylov, C. Offen, L. Ares, B.E. Wembe Moafo, S. Ober-Blöbaum, T. Meier, P. Sharapova, J. Sperling, (n.d.).","chicago":"Kopylov, Denis, Christian Offen, Laura Ares, Boris Edgar Wembe Moafo, Sina Ober-Blöbaum, Torsten Meier, Polina Sharapova, and Jan Sperling. “Multiphoton, Multimode State Classification for Nonlinear Optical Circuits ,” n.d."},"type":"preprint","department":[{"_id":"623"},{"_id":"15"},{"_id":"636"}],"oa":"1","external_id":{"arxiv":["2502.05123"]},"date_created":"2025-02-10T08:26:45Z","publication_status":"submitted","date_updated":"2025-02-10T08:36:12Z","status":"public","year":"2025","title":"Multiphoton, multimode state classification for nonlinear optical circuits ","author":[{"id":"98502","first_name":"Denis","last_name":"Kopylov","full_name":"Kopylov, Denis"},{"full_name":"Offen, Christian","last_name":"Offen","orcid":"0000-0002-5940-8057","first_name":"Christian","id":"85279"},{"full_name":"Ares, Laura","first_name":"Laura","last_name":"Ares"},{"full_name":"Wembe Moafo, Boris Edgar","last_name":"Wembe Moafo","first_name":"Boris Edgar","id":"95394"},{"id":"16494","full_name":"Ober-Blöbaum, Sina","first_name":"Sina","last_name":"Ober-Blöbaum"},{"last_name":"Meier","orcid":"0000-0001-8864-2072","first_name":"Torsten","full_name":"Meier, Torsten","id":"344"},{"last_name":"Sharapova","first_name":"Polina","full_name":"Sharapova, Polina","id":"60286"},{"last_name":"Sperling","first_name":"Jan","orcid":"0000-0002-5844-3205","full_name":"Sperling, Jan","id":"75127"}],"user_id":"85279","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2502.05123","open_access":"1"}],"language":[{"iso":"eng"}],"_id":"58544"}]