[{"project":[{"_id":"131","name":"TRR 285 - Project Area A"},{"_id":"133","name":"TRR 285 - Project Area C"},{"_id":"136","name":"TRR 285 - Subproject A02"},{"_id":"146","name":"TRR 285 - Subproject C02"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"quality_controlled":"1","citation":{"bibtex":"@article{Neuser_Kaimann_Stratmann_Bobbert_Klöckner_Mann_Hoyer_Meschut_Schaper_2026, title={Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR)}, volume={164}, DOI={https://doi.org/10.1016/j.jmapro.2026.02.040}, journal={Journal of Manufacturing Processes}, publisher={Elsevier}, author={Neuser, Moritz and Kaimann, Pia Katharina and Stratmann, Ina and Bobbert, Mathias and Klöckner, Johann Moritz Benedikt and Mann, Moritz and Hoyer, Kay-Peter and Meschut, Gerson and Schaper, Mirko}, year={2026} }","ama":"Neuser M, Kaimann PK, Stratmann I, et al. Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR). Journal of Manufacturing Processes. 2026;164. doi:https://doi.org/10.1016/j.jmapro.2026.02.040","short":"M. Neuser, P.K. Kaimann, I. Stratmann, M. Bobbert, J.M.B. Klöckner, M. Mann, K.-P. Hoyer, G. Meschut, M. Schaper, Journal of Manufacturing Processes 164 (2026).","chicago":"Neuser, Moritz, Pia Katharina Kaimann, Ina Stratmann, Mathias Bobbert, Johann Moritz Benedikt Klöckner, Moritz Mann, Kay-Peter Hoyer, Gerson Meschut, and Mirko Schaper. “Solidification-Joinability Correlation of Hypoeutectic Aluminium Casting Alloys for Self-Piercing Riveting (SPR).” Journal of Manufacturing Processes 164 (2026). https://doi.org/10.1016/j.jmapro.2026.02.040.","ieee":"M. Neuser et al., “Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR),” Journal of Manufacturing Processes, vol. 164, 2026, doi: https://doi.org/10.1016/j.jmapro.2026.02.040.","mla":"Neuser, Moritz, et al. “Solidification-Joinability Correlation of Hypoeutectic Aluminium Casting Alloys for Self-Piercing Riveting (SPR).” Journal of Manufacturing Processes, vol. 164, Elsevier, 2026, doi:https://doi.org/10.1016/j.jmapro.2026.02.040.","apa":"Neuser, M., Kaimann, P. K., Stratmann, I., Bobbert, M., Klöckner, J. M. B., Mann, M., Hoyer, K.-P., Meschut, G., & Schaper, M. (2026). Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR). Journal of Manufacturing Processes, 164. https://doi.org/10.1016/j.jmapro.2026.02.040"},"status":"public","volume":164,"user_id":"32340","_id":"64678","funded_apc":"1","publisher":"Elsevier","abstract":[{"lang":"eng","text":"One of the major topics in the modern automotive industry is reducing emissions and increasing the mileage\r\nrange. To tackle this challenge, on the one hand, modifying the powertrain system is a possibility, and on the\r\nother hand, lightweight design offers various possibilities. Multi-Material Design (MMD) involves designing car\r\nbodies that combine different materials that require joining. Given the variety of materials, mechanical joining\r\nprocesses are preferred. Especially the current development of the Giga/Mega-casting process concerning\r\naluminium casting and the subsequent mechanical joining illustrates the challenges of this material group. In car\r\nproduction, aluminium castings are mainly made from aluminium-silicon (AlSi) alloys. Ultimately, the alloy\r\nsystem's insufficient ductility leads to crack initiation during mechanical joining. Cast parts are therefore often\r\nused in areas of the car body that are exposed to high-pressure loads. For example, self-piercing riveting (SPR) is\r\nused due to its high load-bearing capacity. In this study, improved joinability is demonstrated by influencing the\r\nmicrostructure through tailored solidification rates and a developed heat-treatment chain strategy adapted for\r\nhypoeutectic AlSi systems. Data on microstructure, mechanical, and joining properties are used to develop a\r\nsolidification-joining correlation for the SPR process across a range of Si contents and solidification rates. The\r\npurpose is to develop the ability to produce suitable aluminium castings with sufficient joinability, thereby\r\nimproving versatility."}],"publication":"Journal of Manufacturing Processes","department":[{"_id":"43"},{"_id":"158"},{"_id":"157"},{"_id":"321"}],"keyword":["Mechanical joining","Aluminium","Self-piercing riveting","Casting","Microstructure","Joinability AlSi-alloys"],"type":"journal_article","date_created":"2026-02-26T11:21:24Z","article_type":"original","intvolume":" 164","publication_status":"published","date_updated":"2026-02-26T11:22:03Z","author":[{"id":"32340","last_name":"Neuser","first_name":"Moritz","full_name":"Neuser, Moritz"},{"first_name":"Pia Katharina","last_name":"Kaimann","full_name":"Kaimann, Pia Katharina","id":"44935"},{"full_name":"Stratmann, Ina","first_name":"Ina","last_name":"Stratmann"},{"id":"7850","full_name":"Bobbert, Mathias","last_name":"Bobbert","first_name":"Mathias"},{"last_name":"Klöckner","first_name":"Johann Moritz Benedikt","full_name":"Klöckner, Johann Moritz Benedikt"},{"full_name":"Mann, Moritz","first_name":"Moritz","last_name":"Mann"},{"first_name":"Kay-Peter","last_name":"Hoyer","full_name":"Hoyer, Kay-Peter","id":"48411"},{"id":"32056","first_name":"Gerson","last_name":"Meschut","orcid":"0000-0002-2763-1246","full_name":"Meschut, Gerson"},{"id":"43720","full_name":"Schaper, Mirko","last_name":"Schaper","first_name":"Mirko"}],"year":"2026","title":"Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR)","doi":"https://doi.org/10.1016/j.jmapro.2026.02.040","language":[{"iso":"eng"}]},{"_id":"65311","publisher":"AIS","user_id":"83557","status":"public","jel":["D83","L14","D83","O33","C63","P"],"external_id":{"unknown":["https://aisel.aisnet.org/cais/vol58/iss1/37/"]},"citation":{"ieee":"U. Ibrahimli, S. Hemmrich, and A. Winkelmann, “Bridging Systems Theory and Information Systems: A Framework for Designing Complex Information Systems,” Communication of the Association for Information Systems, 2026, doi: https://aisel.aisnet.org/cais/vol58/iss1/37/.","apa":"Ibrahimli, U., Hemmrich, S., & Winkelmann, A. (2026). Bridging Systems Theory and Information Systems: A Framework for Designing Complex Information Systems. Communication of the Association for Information Systems. https://aisel.aisnet.org/cais/vol58/iss1/37/","short":"U. Ibrahimli, S. Hemmrich, A. Winkelmann, Communication of the Association for Information Systems (2026).","chicago":"Ibrahimli, Ulvi, Simon Hemmrich, and Axel Winkelmann. “Bridging Systems Theory and Information Systems: A Framework for Designing Complex Information Systems.” Communication of the Association for Information Systems, 2026. https://aisel.aisnet.org/cais/vol58/iss1/37/.","mla":"Ibrahimli, Ulvi, et al. “Bridging Systems Theory and Information Systems: A Framework for Designing Complex Information Systems.” Communication of the Association for Information Systems, AIS, 2026, doi:https://aisel.aisnet.org/cais/vol58/iss1/37/.","bibtex":"@article{Ibrahimli_Hemmrich_Winkelmann_2026, title={Bridging Systems Theory and Information Systems: A Framework for Designing Complex Information Systems}, DOI={https://aisel.aisnet.org/cais/vol58/iss1/37/}, journal={Communication of the Association for Information Systems}, publisher={AIS}, author={Ibrahimli, Ulvi and Hemmrich, Simon and Winkelmann, Axel}, year={2026} }","ama":"Ibrahimli U, Hemmrich S, Winkelmann A. Bridging Systems Theory and Information Systems: A Framework for Designing Complex Information Systems. Communication of the Association for Information Systems. Published online 2026. doi:https://aisel.aisnet.org/cais/vol58/iss1/37/"},"quality_controlled":"1","language":[{"iso":"eng"}],"doi":"https://aisel.aisnet.org/cais/vol58/iss1/37/","alternative_title":["Design Your System"],"year":"2026","title":"Bridging Systems Theory and Information Systems: A Framework for Designing Complex Information Systems","author":[{"full_name":"Ibrahimli, Ulvi","last_name":"Ibrahimli","first_name":"Ulvi"},{"full_name":"Hemmrich, Simon","first_name":"Simon","last_name":"Hemmrich"},{"last_name":"Winkelmann","first_name":"Axel","full_name":"Winkelmann, Axel"}],"publication_identifier":{"unknown":["1529-3181"]},"publication_status":"published","date_updated":"2026-04-02T04:32:05Z","article_type":"review","date_created":"2026-04-02T04:19:09Z","keyword":["Information Systems Research","Systems Theory","System Complexity","System Design","Design Science"],"type":"journal_article","department":[{"_id":"195"}],"publication":"Communication of the Association for Information Systems","extern":"1","abstract":[{"lang":"eng","text":"Information Systems (IS) is rooted in systems theory. Systems theory offers powerful concepts to address challenges of growing system complexity and non-systemic design approaches in information systems. Despite its systemic origins, systems theory remains a peripheral topic in IS. The study addresses this gap by introducing a comprehensive framework of 52 systems-theoretical concepts to guide the design of complex IS artifacts. We synthesize scattered systems knowledge from diverse disciplines to provide a unified level of abstraction for complex information system design. We apply the framework to a use case of business reputation systems to show how the systems lens informs the design of a novel, complex information system. We make three key contributions to the literature. First, the framework provides a common ground for interdisciplinary research in information system design. Second, it offers a unified level of abstraction grounded in systems theory that serves as a coherent basis for artifact design. Third, it demonstrates the potential of systems theory as a foundational justificatory knowledge base. Furthermore, we provide guidance on applying the framework across multiple modes of reasoning, alongside further application guidelines. The study thus serves as a bridge between the body of systems knowledge and contextual design in IS."}]},{"editor":[{"last_name":"Nissen","first_name":"Volker","full_name":"Nissen, Volker"}],"user_id":"83557","language":[{"iso":"eng"}],"_id":"65310","date_updated":"2026-04-02T04:32:01Z","publication_status":"published","publication_identifier":{"unknown":["978-3032173836"]},"author":[{"id":"83557","last_name":"Hemmrich","first_name":"Simon","full_name":"Hemmrich, Simon"},{"last_name":"Nissen","first_name":"Volker","full_name":"Nissen, Volker"}],"title":"A blockchain-based reputation system for consulting","status":"public","year":"2026","department":[{"_id":"195"}],"type":"book_chapter","keyword":["Reputation Systems","Consulting","Design Science Invention","Incentive","Blockchain","Monetary ratings","building trust","reduce information asymmetry consulting","B2B reputation system","consulting risk reduction","supplier evaluation system"],"date_created":"2026-04-02T04:06:47Z","abstract":[{"lang":"eng","text":"Trust between client and consultant is perhaps the most important asset in con-sulting, as this is a highly intangible knowledge-intensive business that concerns is-sues of outstanding strategic and operational importance for the customers. Cli-ents who have not worked with a particular consultancy face considerable risk when they place an order while lacking reliable information about the service quality they can expect. There is a strong link between trust and reputation, as the positive reputation of a consultancy can act as a substitute for a new client’s missing individual experience with the provider, fostering trust in the service quali-ty. Thus, creating, maintaining, and demonstrating a good reputation is of signifi-cant importance for consultancies in a very competitive industry.\r\nTo facilitate trustworthy signals, we design and implement a novel reputation mechanism that carries a monetary weight stored on a blockchain network as an immutable, decentralized, and transparent ledger. Based on an implementation in the Ethereum network and subsequent evaluation, we conclude that the reputation mechanism can contribute to leveling information asymmetry and reducing risk while increasing reputation and trust. The mechanism lends itself to being used in other business-to-business scenarios that suffer from similar information asymmetries."}],"quality_controlled":"1","extern":"1","citation":{"mla":"Hemmrich, Simon, and Volker Nissen. “A Blockchain-Based Reputation System for Consulting.” Advanced Studies in Consulting Research and Digitalization – A Scientific Update on the Digital Transformation of the Consulting Industry. Springer., edited by Volker Nissen, 2026.","bibtex":"@inbook{Hemmrich_Nissen_2026, title={A blockchain-based reputation system for consulting}, booktitle={ Advanced Studies in Consulting Research and Digitalization – A Scientific Update on the Digital Transformation of the Consulting Industry. Springer.}, author={Hemmrich, Simon and Nissen, Volker}, editor={Nissen, Volker}, year={2026} }","ama":"Hemmrich S, Nissen V. A blockchain-based reputation system for consulting. In: Nissen V, ed. Advanced Studies in Consulting Research and Digitalization – A Scientific Update on the Digital Transformation of the Consulting Industry. Springer. ; 2026.","ieee":"S. Hemmrich and V. Nissen, “A blockchain-based reputation system for consulting,” in Advanced Studies in Consulting Research and Digitalization – A Scientific Update on the Digital Transformation of the Consulting Industry. Springer., V. Nissen, Ed. 2026.","apa":"Hemmrich, S., & Nissen, V. (2026). A blockchain-based reputation system for consulting. In V. Nissen (Ed.), Advanced Studies in Consulting Research and Digitalization – A Scientific Update on the Digital Transformation of the Consulting Industry. Springer.","short":"S. Hemmrich, V. Nissen, in: V. Nissen (Ed.), Advanced Studies in Consulting Research and Digitalization – A Scientific Update on the Digital Transformation of the Consulting Industry. Springer., 2026.","chicago":"Hemmrich, Simon, and Volker Nissen. “A Blockchain-Based Reputation System for Consulting.” In Advanced Studies in Consulting Research and Digitalization – A Scientific Update on the Digital Transformation of the Consulting Industry. Springer., edited by Volker Nissen, 2026."},"publication":" Advanced Studies in Consulting Research and Digitalization – A Scientific Update on the Digital Transformation of the Consulting Industry. Springer."},{"quality_controlled":"1","project":[{"name":"SHAPE : Gestaltung von Dienstleistungsentwicklungsprozessen und lnnovationspartnerschaften mit Unternehmen","_id":"1250"}],"file_date_updated":"2026-04-21T13:14:30Z","citation":{"ieee":"D. Beverungen, J. Poeppelbuss, S. Hemmrich, and T. Iqbal, “Service through communication—Conceptualizing service systems with Luhmann’s systems theory,” Electronic Markets, vol. 36, no. 1, Art. no. 37, 2026, doi: 10.1007/s12525-026-00889-w.","apa":"Beverungen, D., Poeppelbuss, J., Hemmrich, S., & Iqbal, T. (2026). Service through communication—Conceptualizing service systems with Luhmann’s systems theory. Electronic Markets, 36(1), Article 37. https://doi.org/10.1007/s12525-026-00889-w","chicago":"Beverungen, Daniel, Jens Poeppelbuss, Simon Hemmrich, and Taskeen Iqbal. “Service through Communication—Conceptualizing Service Systems with Luhmann’s Systems Theory.” Electronic Markets 36, no. 1 (2026). https://doi.org/10.1007/s12525-026-00889-w.","short":"D. Beverungen, J. Poeppelbuss, S. Hemmrich, T. Iqbal, Electronic Markets 36 (2026).","mla":"Beverungen, Daniel, et al. “Service through Communication—Conceptualizing Service Systems with Luhmann’s Systems Theory.” Electronic Markets, vol. 36, no. 1, 37, Springer Science and Business Media LLC, 2026, doi:10.1007/s12525-026-00889-w.","bibtex":"@article{Beverungen_Poeppelbuss_Hemmrich_Iqbal_2026, title={Service through communication—Conceptualizing service systems with Luhmann’s systems theory}, volume={36}, DOI={10.1007/s12525-026-00889-w}, number={137}, journal={Electronic Markets}, publisher={Springer Science and Business Media LLC}, author={Beverungen, Daniel and Poeppelbuss, Jens and Hemmrich, Simon and Iqbal, Taskeen}, year={2026} }","ama":"Beverungen D, Poeppelbuss J, Hemmrich S, Iqbal T. Service through communication—Conceptualizing service systems with Luhmann’s systems theory. Electronic Markets. 2026;36(1). doi:10.1007/s12525-026-00889-w"},"oa":"1","has_accepted_license":"1","status":"public","jel":["L80"],"user_id":"59677","ddc":["380"],"volume":36,"_id":"65476","publisher":"Springer Science and Business Media LLC","abstract":[{"text":"Service research has evolved into an interdisciplinary research field that bridges diverse disciplines, including information systems (IS) and marketing. Nearly two decades ago, the service system concept was introduced as a foundational abstraction in service research, drawing on ideas from the service-dominant logic (S-D logic) of marketing. Despite its widespread adoption in service research, particularly in the IS discipline, the service system concept lacks a solid theoretical foundation. This has resulted in conceptual ambiguity and overlap with related constructs, such as service ecosystems. Moreover, it has largely remained a static analytical lens, insufficiently capturing dynamic service phenomena, including value co-creation and co-destruction, as well as the emergence of institutional arrangements. To address these limitations, we propose Luhmann’s systems theory (LST) as a robust framework for conceptualizing service systems as autopoietic (self-creating) systems, in which communication serves as the fundamental mechanism that drives value co-creation. We derive five theoretical propositions from this re-conceptualization that clarify conceptual ambiguity and allow researchers to explore dynamic service phenomena in greater depth. Given LST’s general approach, our conceptualization provides a theoretically grounded, interdisciplinary foundation for advancing service research.","lang":"eng"}],"issue":"1","publication":"Electronic Markets","type":"journal_article","keyword":["Service system","Service ecosystem","Systems theory","Service research"],"department":[{"_id":"195"},{"_id":"534"}],"file":[{"file_id":"65477","content_type":"application/pdf","success":1,"relation":"main_file","date_updated":"2026-04-21T13:14:30Z","file_name":"Service is Communication - EM Paper.pdf","access_level":"closed","file_size":2793039,"date_created":"2026-04-21T13:14:30Z","creator":"dabe"}],"date_created":"2026-04-21T13:13:02Z","publication_status":"published","date_updated":"2026-06-11T13:18:09Z","article_type":"original","intvolume":" 36","year":"2026","title":"Service through communication—Conceptualizing service systems with Luhmann’s systems theory","author":[{"first_name":"Daniel","last_name":"Beverungen","full_name":"Beverungen, Daniel"},{"first_name":"Jens","last_name":"Poeppelbuss","full_name":"Poeppelbuss, Jens"},{"full_name":"Hemmrich, Simon","last_name":"Hemmrich","first_name":"Simon"},{"last_name":"Iqbal","first_name":"Taskeen","full_name":"Iqbal, Taskeen"}],"publication_identifier":{"issn":["1019-6781","1422-8890"]},"doi":"10.1007/s12525-026-00889-w","article_number":"37","main_file_link":[{"open_access":"1","url":"https://link.springer.com/content/pdf/10.1007/s12525-026-00889-w.pdf"}],"language":[{"iso":"eng"}]},{"conference":{"end_date":"2025-10-10","location":"Dubrovnik","name":"20th SDEWES conference","start_date":"2025-10-05"},"status":"public","has_accepted_license":"1","publisher":"Elsevier","_id":"66001","page":"102030","volume":31,"user_id":"56918","citation":{"bibtex":"@article{Henne_Rahlf_Naumann_Meschede_2026, title={Towards Stakeholder-Aware Demand-Side management assessment in heterogeneous residential Microgrids: A Multi-Agent approach}, volume={31}, DOI={https://doi.org/10.1016/j.ecmx.2026.102030}, journal={Energy Conversion and Management: X}, publisher={Elsevier}, author={Henne, Kevin and Rahlf, Henning Christoph and Naumann, Marius and Meschede, Henning}, year={2026}, pages={102030} }","ama":"Henne K, Rahlf HC, Naumann M, Meschede H. Towards Stakeholder-Aware Demand-Side management assessment in heterogeneous residential Microgrids: A Multi-Agent approach. Energy Conversion and Management: X. 2026;31:102030. doi:https://doi.org/10.1016/j.ecmx.2026.102030","mla":"Henne, Kevin, et al. “Towards Stakeholder-Aware Demand-Side Management Assessment in Heterogeneous Residential Microgrids: A Multi-Agent Approach.” Energy Conversion and Management: X, vol. 31, Elsevier, 2026, p. 102030, doi:https://doi.org/10.1016/j.ecmx.2026.102030.","short":"K. Henne, H.C. Rahlf, M. Naumann, H. Meschede, Energy Conversion and Management: X 31 (2026) 102030.","chicago":"Henne, Kevin, Henning Christoph Rahlf, Marius Naumann, and Henning Meschede. “Towards Stakeholder-Aware Demand-Side Management Assessment in Heterogeneous Residential Microgrids: A Multi-Agent Approach.” Energy Conversion and Management: X 31 (2026): 102030. https://doi.org/10.1016/j.ecmx.2026.102030.","ieee":"K. Henne, H. C. Rahlf, M. Naumann, and H. Meschede, “Towards Stakeholder-Aware Demand-Side management assessment in heterogeneous residential Microgrids: A Multi-Agent approach,” Energy Conversion and Management: X, vol. 31, p. 102030, 2026, doi: https://doi.org/10.1016/j.ecmx.2026.102030.","apa":"Henne, K., Rahlf, H. C., Naumann, M., & Meschede, H. (2026). Towards Stakeholder-Aware Demand-Side management assessment in heterogeneous residential Microgrids: A Multi-Agent approach. Energy Conversion and Management: X, 31, 102030. https://doi.org/10.1016/j.ecmx.2026.102030"},"author":[{"full_name":"Henne, Kevin","first_name":"Kevin","last_name":"Henne","id":"56918"},{"id":"56955","orcid":"0009-0006-8106-2132","last_name":"Rahlf","first_name":"Henning Christoph","full_name":"Rahlf, Henning Christoph"},{"full_name":"Naumann, Marius","first_name":"Marius","last_name":"Naumann","id":"94950"},{"id":"86954","full_name":"Meschede, Henning","orcid":"0000-0002-1538-089X","last_name":"Meschede","first_name":"Henning"}],"publication_identifier":{"issn":["2590-1745"]},"title":"Towards Stakeholder-Aware Demand-Side management assessment in heterogeneous residential Microgrids: A Multi-Agent approach","year":"2026","intvolume":" 31","publication_status":"published","date_updated":"2026-06-19T12:41:33Z","language":[{"iso":"eng"}],"doi":"https://doi.org/10.1016/j.ecmx.2026.102030","publication":"Energy Conversion and Management: X","abstract":[{"lang":"eng","text":"Expanding renewable energy sources is essential for a sustainable energy supply but challenges grid stability, as the volatility of solar and wind causes periods of over- and undersupply. Private households are central to this transition, combining dynamic consumption with decentralised generation. This paper presents a multi-agent microgrid simulation built on the Mesa framework, focusing on the heterogeneous objectives and technological capabilities of residential participants. Households are modelled as autonomous agents with individual strategies, while a dedicated “grid agent” represents the distribution system operator and regulates the microgrid in a grid-supportive manner. The emission factor serves as the key indicator for grid-friendly behaviour. Results show that in summer, unmanaged PV feed-in from heterogeneous households causes substantial grid stress and balancing effort for the distribution system operator. Dynamic electricity prices can incentivise grid-friendly dispatch, but their effectiveness depends on the correlation between price signals and renewable availability and cannot guarantee grid-supportive behaviour alone. The grid agent reliably improves the grid-supportive coefficient, yet its operating strategy, for instance additional peak-reduction objectives, can interfere with price-based incentives. Effective demand-side management therefore requires careful analysis of stakeholder interactions. Building on this insight, thepaper provides a basic framework for the design, implementation, and assessment of both integrated and individual energy management strategies within a microgrid environment. By simulating the dynamic interactions among system participants and strategies, it enables comprehensive evaluation of their collective impact on the grid, supporting the development of robust solutions for future electricity networks."}],"date_created":"2026-06-19T12:27:48Z","department":[{"_id":"644"}],"type":"journal_article","keyword":["Microgrid","Decentralised Energy Systems","Multi-Agent System","Residential Demand-Side Management","Optimisation"]},{"department":[{"_id":"563"}],"keyword":["Dataspaces","Modelling","SysML","Gaia-X","System Specification"],"type":"conference","date_created":"2025-02-21T15:25:13Z","quality_controlled":"1","abstract":[{"text":"Utilizing data is crucial for economic success, but a lack of interoperability and concerns about the misuse of ones own data are hindering the cross-organizational use of data. Dataspaces provide the infrastructure necessary to integrate heterogeneous data sources within an organization or ecosystem, enabling seamless data interaction and interoperability. In addition, data spaces strengthen data sovereignty through their decentralized nature, which enables organizations to effectively control and manage their data. However, challenges persist in managing the complexity and dynamic nature of dataspaces, requiring significant resources and technical expertise. The decentralized nature leads to a large and diverse number of stakeholders, who need to agree on the use and scope of a dataspace. Modeling is a common approach to cope with technical complexity and heterogeneous stakeholders. In this paper, we propose a version of SysML and a corresponding method that focus on the modelling of data spaces. We provide a dataspace modelling method to unify the understanding of dataspaces and scope among all stakeholders to simplify the design and development process.","lang":"eng"}],"citation":{"chicago":"Kulkarni, Pranav Jayant, Julian Zerbin, Christian Koldewey, Ruslan Bernijazov, and Roman Dumitrescu. “Using SysML as a Modelling Language for Dataspaces.” In 2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD). IEEE, 2025. https://doi.org/10.1109/ictmod63116.2024.10878227.","short":"P.J. Kulkarni, J. Zerbin, C. Koldewey, R. Bernijazov, R. Dumitrescu, in: 2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD), IEEE, 2025.","apa":"Kulkarni, P. J., Zerbin, J., Koldewey, C., Bernijazov, R., & Dumitrescu, R. (2025). Using SysML as a Modelling Language for Dataspaces. 2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD). 2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD), Sharjah, United Arab Emirates . https://doi.org/10.1109/ictmod63116.2024.10878227","ieee":"P. J. Kulkarni, J. Zerbin, C. Koldewey, R. Bernijazov, and R. Dumitrescu, “Using SysML as a Modelling Language for Dataspaces,” presented at the 2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD), Sharjah, United Arab Emirates , 2025, doi: 10.1109/ictmod63116.2024.10878227.","ama":"Kulkarni PJ, Zerbin J, Koldewey C, Bernijazov R, Dumitrescu R. Using SysML as a Modelling Language for Dataspaces. In: 2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD). IEEE; 2025. doi:10.1109/ictmod63116.2024.10878227","bibtex":"@inproceedings{Kulkarni_Zerbin_Koldewey_Bernijazov_Dumitrescu_2025, title={Using SysML as a Modelling Language for Dataspaces}, DOI={10.1109/ictmod63116.2024.10878227}, booktitle={2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD)}, publisher={IEEE}, author={Kulkarni, Pranav Jayant and Zerbin, Julian and Koldewey, Christian and Bernijazov, Ruslan and Dumitrescu, Roman}, year={2025} }","mla":"Kulkarni, Pranav Jayant, et al. “Using SysML as a Modelling Language for Dataspaces.” 2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD), IEEE, 2025, doi:10.1109/ictmod63116.2024.10878227."},"publication":"2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD)","doi":"10.1109/ictmod63116.2024.10878227","user_id":"51711","_id":"58763","publisher":"IEEE","language":[{"iso":"eng"}],"date_updated":"2026-01-30T09:05:24Z","publication_status":"published","conference":{"location":"Sharjah, United Arab Emirates ","start_date":"2024-11-04","name":"2024 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD)","end_date":"2024-11-06"},"author":[{"full_name":"Kulkarni, Pranav Jayant","first_name":"Pranav Jayant","last_name":"Kulkarni","id":"86782"},{"first_name":"Julian","last_name":"Zerbin","full_name":"Zerbin, Julian","id":"51711"},{"full_name":"Koldewey, Christian","orcid":"https://orcid.org/0000-0001-7992-6399","last_name":"Koldewey","first_name":"Christian","id":"43136"},{"id":"36312","last_name":"Bernijazov","first_name":"Ruslan","full_name":"Bernijazov, Ruslan"},{"full_name":"Dumitrescu, Roman","first_name":"Roman","last_name":"Dumitrescu","id":"16190"}],"title":"Using SysML as a Modelling Language for Dataspaces","year":"2025","status":"public"},{"publication":"Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen","abstract":[{"text":"Aluminium-Silizium-Legierungen (AlSi) werden insbesondere bei der gießtechnischen\r\nHerstellung von Leichtbaukomponenten für Fahrzeuge verwendet. Dieses Legierungssystem hat hervorragende\r\nGießeigenschaften bei gleichzeitig akzeptablen mechanischen Eigenschaften. Aufgrund des hohen\r\nSilizium-(Si)-Gehaltes, wodurch die Volumenkontraktion im Phasenübergang von flüssig-fest nahezu\r\nunterbunden wird, neigen AlSi-Legierungen dazu, feinere oder gröbere Si-Platten bei unterschiedlichen\r\nErstarrungsgeschwindigkeiten zu bilden. Um die mechanischen Eigenschaften zu verbessern, werden\r\ndem Legierungssystem in der Schmelzphase entweder Natrium (Na) oder Strontium (Sr) zugesetzt. Dies\r\nhat zur Folge, dass sich eine fein lamellare Si-Morphologie bei der Erstarrung ausbildet; dies kann ebenfalls\r\ndurch hohe Erstarrungsgeschwindigkeiten erreicht werden. Ein nachfolgendes Lösungsglühen bewirkt\r\neine Sphäroidisierung der Si-Partikel und dient der Steigerung der Duktilität. Aktuell fehlen fundierte\r\nErkenntnisse zur Ausprägung der Si-Morphologie in Abhängigkeit der Erstarrungsgeschwindigkeit oder\r\ninfolge einer Wärmebehandlung. Vor diesem Hintergrund werden in dieser Studie verschiedene Behandlungsparameter\r\nin Bezug auf das Einformverhalten der Si-Partikel mit einem bildauswertenden Verfahren\r\nevaluiert sowie unter Bezug auf verschiedene chemische Zusammensetzungen miteinander korreliert.","lang":"ger"},{"lang":"eng","text":"Aluminium-silicon alloys (AlSi) are used in the casting of lightweight vehicle components. This\r\nalloy system has excellent casting properties accompanied by acceptable mechanical properties. Due to\r\nthe high silicon (Si) content, which almost completely prevents volume contraction during the liquid-solid\r\nphase transition, AlSi alloys tend to form finer or coarser Si plates at different solidification rates. To\r\nimprove the mechanical properties, either sodium (Na) or strontium (Sr) is added to the alloy system in\r\nthe melting phase. This results in the formation of a fine lamellar Si morphology during solidification, which\r\ncan also be achieved by high solidification rates. Subsequent solution annealing causes spheroidisation\r\nof the Si particles and increases ductility. Currently, there is a lack in scientific knowledge regarding the\r\nSi-morphology as a function of solidification rate or as a result of heat treatment. Therefore, this study\r\nevaluates various treatment parameters in relation to the shaping behaviour of Si particles using an image\r\nanalysis method and correlates them with different chemical compositions."}],"date_created":"2025-12-01T13:46:42Z","type":"conference","keyword":["Bildauswertendes Verfahren","Mikrostrukturanalyse","AlSi-System","Si-Morphologie"],"department":[{"_id":"43"},{"_id":"9"},{"_id":"158"},{"_id":"321"}],"title":"Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen","year":"2025","publication_identifier":{"isbn":["978-3-88355-454-9"]},"author":[{"id":"32340","full_name":"Neuser, Moritz","first_name":"Moritz","last_name":"Neuser"},{"last_name":"Cichon","first_name":"Gerrit","full_name":"Cichon, Gerrit"},{"first_name":"Kay-Peter","last_name":"Hoyer","full_name":"Hoyer, Kay-Peter","id":"48411"},{"id":"43720","full_name":"Schaper, Mirko","first_name":"Mirko","last_name":"Schaper"}],"publication_status":"published","date_updated":"2025-12-01T13:46:53Z","intvolume":" 43","language":[{"iso":"ger"}],"alternative_title":["Image analysis method for evaluating the microstructure of AlSi-alloys"],"citation":{"chicago":"Neuser, Moritz, Gerrit Cichon, Kay-Peter Hoyer, and Mirko Schaper. “Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen.” In Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, 43:454–59. Sankt Augustin: Deutsche Gesellschaft für Materialkunde (DGM), 2025.","short":"M. Neuser, G. Cichon, K.-P. Hoyer, M. Schaper, in: Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, Deutsche Gesellschaft für Materialkunde (DGM), Sankt Augustin, 2025, pp. 454–459.","apa":"Neuser, M., Cichon, G., Hoyer, K.-P., & Schaper, M. (2025). Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen. Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, 43, 454–459.","ieee":"M. Neuser, G. Cichon, K.-P. Hoyer, and M. Schaper, “Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen,” in Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, Dresden, 2025, vol. 43, pp. 454–459.","ama":"Neuser M, Cichon G, Hoyer K-P, Schaper M. Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen. In: Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen. Vol 43. Deutsche Gesellschaft für Materialkunde (DGM); 2025:454-459.","bibtex":"@inproceedings{Neuser_Cichon_Hoyer_Schaper_2025, place={Sankt Augustin}, title={Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen}, volume={43}, booktitle={Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen}, publisher={Deutsche Gesellschaft für Materialkunde (DGM)}, author={Neuser, Moritz and Cichon, Gerrit and Hoyer, Kay-Peter and Schaper, Mirko}, year={2025}, pages={454–459} }","mla":"Neuser, Moritz, et al. “Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen.” Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, vol. 43, Deutsche Gesellschaft für Materialkunde (DGM), 2025, pp. 454–59."},"quality_controlled":"1","project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"_id":"131","name":"TRR 285 - Project Area A"},{"_id":"136","name":"TRR 285 - Subproject A02"}],"place":"Sankt Augustin","status":"public","conference":{"end_date":"2025-11-28","start_date":"2025-11-27","name":"Werkstoffprüfung - 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025","location":"Dresden"},"page":"454 - 459","publisher":"Deutsche Gesellschaft für Materialkunde (DGM)","_id":"62725","user_id":"32340","volume":43},{"quality_controlled":"1","citation":{"ieee":"S. Hemmrich, V. Nissen, D. Beverungen, and J. D. M. Pauls, “Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting,” Information Systems and e-Business Management, vol. 23, no. 1, 2025, doi: https://doi.org/10.1007/s10257-025-00702-9.","apa":"Hemmrich, S., Nissen, V., Beverungen, D., & Pauls, J. D. M. (2025). Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting. Information Systems and E-Business Management, 23(1). https://doi.org/10.1007/s10257-025-00702-9","chicago":"Hemmrich, Simon, Volker Nissen, Daniel Beverungen, and Josias Daniel Miño Pauls. “Blockchain‑based Reputation Systemsfor Business‑to‑business Services: Designing a Reputation Mechanism to Reduce Information Asymmetry in Professional Consulting.” Information Systems and E-Business Management 23, no. 1 (2025). https://doi.org/10.1007/s10257-025-00702-9.","short":"S. Hemmrich, V. Nissen, D. Beverungen, J.D.M. Pauls, Information Systems and E-Business Management 23 (2025).","mla":"Hemmrich, Simon, et al. “Blockchain‑based Reputation Systemsfor Business‑to‑business Services: Designing a Reputation Mechanism to Reduce Information Asymmetry in Professional Consulting.” Information Systems and E-Business Management, vol. 23, no. 1, Springer, 2025, doi:https://doi.org/10.1007/s10257-025-00702-9.","bibtex":"@article{Hemmrich_Nissen_Beverungen_Pauls_2025, title={Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting}, volume={23}, DOI={https://doi.org/10.1007/s10257-025-00702-9}, number={1}, journal={Information Systems and e-Business Management}, publisher={Springer}, author={Hemmrich, Simon and Nissen, Volker and Beverungen, Daniel and Pauls, Josias Daniel Miño}, year={2025} }","ama":"Hemmrich S, Nissen V, Beverungen D, Pauls JDM. Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting. Information Systems and e-Business Management. 2025;23(1). doi:https://doi.org/10.1007/s10257-025-00702-9"},"file_date_updated":"2025-05-28T08:05:18Z","oa":"1","external_id":{"unknown":["https://doi.org/10.1007/s10257-025-00702-9"]},"has_accepted_license":"1","jel":["D81","D82","L86","L10","M30"],"status":"public","volume":23,"ddc":["000"],"user_id":"83557","publisher":"Springer","_id":"60050","abstract":[{"text":"Reputation systems to rate companies’ performances remain largely unexplored inresearch and are scarcely used in business-to-business (B2B) practice. Such systemsare essential for businesses seeking trustworthy partners, as they help reduce infor-mation asymmetry, lower buyers’ transaction risks, and allow high-quality serviceproviders to justify premium pricing. Unlike traditional review-based systems in thebusiness-to-consumer (B2C) context, we propose a B2B reputation mechanism inwhich buyers commit to a rating payment before a transaction. Once the buyer final-izes the rating, this payment is executed and recorded on a blockchain as an immu-table, secure ledger. Our system mimics natural trust-building mechanisms with rat-ings that are (1) monetary-based, (2) stake-based, (3) non-aggregated, (4) involvecounter-ratings, (5) selectively sellable, (6) individually comparable, (7) stored ona blockchain, (8) and monitored by a third instance. This system provides a novelapproach to fostering trust in B2B transactions by reducing information asymme-try and transaction risk. We illustrate the mechanism’s application in the consultingsector. Our analysis has identified 23 institutional trust and distrust dimensions thatpromote establishing institutional trust through the proposed mechanism. Qualita-tive interviews suggest that, while complex and challenging to apply, this mecha-nism can foster trust in B2B transactions. Given the low maturity in the applicationdomain—rating professional business services with business reputation systems—and solution domain—using monetary stakes for ratings, this system stands as apotential invention.","lang":"eng"}],"issue":"1","publication":"Information Systems and e-Business Management","department":[{"_id":"195"}],"keyword":["Information asymmetry","Trust","Reputation system","Monetary rating","Blockchain","Consulting"],"type":"journal_article","date_created":"2025-05-28T08:12:28Z","file":[{"content_type":"application/pdf","success":1,"file_id":"60051","file_size":1440251,"access_level":"closed","file_name":"Hemmrich_et_al-2025-Information_Systems_and_e-Business_Management.pdf","date_updated":"2025-05-28T08:05:18Z","relation":"main_file","date_created":"2025-05-28T08:05:18Z","creator":"hemmrich"}],"intvolume":" 23","article_type":"original","date_updated":"2026-04-02T04:32:13Z","publication_status":"published","author":[{"id":"83557","first_name":"Simon","last_name":"Hemmrich","full_name":"Hemmrich, Simon"},{"full_name":"Nissen, Volker","last_name":"Nissen","first_name":"Volker"},{"id":"59677","full_name":"Beverungen, Daniel","last_name":"Beverungen","first_name":"Daniel"},{"full_name":"Pauls, Josias Daniel Miño","last_name":"Pauls","first_name":"Josias Daniel Miño"}],"year":"2025","title":"Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting","doi":"https://doi.org/10.1007/s10257-025-00702-9","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://link.springer.com/epdf/10.1007/s10257-025-00702-9?sharing_token=fOiWqZx_ScKFAKjxu5UqWPe4RwlQNchNByi7wbcMAY6mjxpZFPB3OtpVT0rAZf9eEBt3_qXIVcZ67l3R9JVYasmuCsIimzE-xfP0N5Rimun248j0jFOnL1eBu4rypKSDFnbmR3kJ5xx-HLnCXvPvQPwpm09qOkS9GSNsiG-du60%3D","open_access":"1"}]},{"language":[{"iso":"eng"}],"_id":"65309","publisher":"Universität Paderborn","page":"347","user_id":"83557","doi":"https://doi.org/10.17619/UNIPB/1-2414","author":[{"id":"83557","last_name":"Hemmrich","first_name":"Simon","full_name":"Hemmrich, Simon"}],"jel":["D8"],"title":"A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets","year":"2025","status":"public","publication_status":"published","date_updated":"2026-04-02T04:31:57Z","date_created":"2026-04-02T03:52:09Z","place":"Paderborn","department":[{"_id":"195"}],"keyword":["Reputation Systems","Rating systems","monetary ratings","incentive mechanism","systems theory","Market coordination","advanced review system"],"type":"dissertation","citation":{"mla":"Hemmrich, Simon. A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets. Universität Paderborn, 2025, doi:https://doi.org/10.17619/UNIPB/1-2414.","ama":"Hemmrich S. A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets. Universität Paderborn; 2025. doi:https://doi.org/10.17619/UNIPB/1-2414","bibtex":"@book{Hemmrich_2025, place={Paderborn}, title={A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets}, DOI={https://doi.org/10.17619/UNIPB/1-2414}, publisher={Universität Paderborn}, author={Hemmrich, Simon}, year={2025} }","apa":"Hemmrich, S. (2025). A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets. Universität Paderborn. https://doi.org/10.17619/UNIPB/1-2414","ieee":"S. Hemmrich, A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets. Paderborn: Universität Paderborn, 2025.","chicago":"Hemmrich, Simon. A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets. Paderborn: Universität Paderborn, 2025. https://doi.org/10.17619/UNIPB/1-2414.","short":"S. Hemmrich, A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets, Universität Paderborn, Paderborn, 2025."},"supervisor":[{"full_name":"Beverungen, Daniel","first_name":"Daniel","last_name":"Beverungen"},{"first_name":"Dennis","last_name":"Kundisch","full_name":"Kundisch, Dennis"}]},{"has_accepted_license":"1","status":"public","volume":"0","user_id":"87909","ddc":["510"],"publisher":"American Institute of Mathematical Sciences (AIMS)","_id":"53101","page":"0-0","citation":{"short":"S. Leyendecker, S. Maslovskaya, S. Ober-Blöbaum, R.T.S.M. de Almagro, F.O. Szemenyei, Journal of Computational Dynamics 0 (2024) 0–0.","chicago":"Leyendecker, Sigrid, Sofya Maslovskaya, Sina Ober-Blöbaum, Rodrigo T. Sato Martín de Almagro, and Flóra Orsolya Szemenyei. “A New Lagrangian Approach to Control Affine Systems with a Quadratic Lagrange Term.” Journal of Computational Dynamics 0, no. 0 (2024): 0–0. https://doi.org/10.3934/jcd.2024017.","ieee":"S. Leyendecker, S. Maslovskaya, S. Ober-Blöbaum, R. T. S. M. de Almagro, and F. O. Szemenyei, “A new Lagrangian approach to control affine systems with a quadratic Lagrange term,” Journal of Computational Dynamics, vol. 0, no. 0, pp. 0–0, 2024, doi: 10.3934/jcd.2024017.","apa":"Leyendecker, S., Maslovskaya, S., Ober-Blöbaum, S., Almagro, R. T. S. M. de, & Szemenyei, F. O. (2024). A new Lagrangian approach to control affine systems with a quadratic Lagrange term. Journal of Computational Dynamics, 0(0), 0–0. https://doi.org/10.3934/jcd.2024017","bibtex":"@article{Leyendecker_Maslovskaya_Ober-Blöbaum_Almagro_Szemenyei_2024, title={A new Lagrangian approach to control affine systems with a quadratic Lagrange term}, volume={0}, DOI={10.3934/jcd.2024017}, number={0}, journal={Journal of Computational Dynamics}, publisher={American Institute of Mathematical Sciences (AIMS)}, author={Leyendecker, Sigrid and Maslovskaya, Sofya and Ober-Blöbaum, Sina and Almagro, Rodrigo T. Sato Martín de and Szemenyei, Flóra Orsolya}, year={2024}, pages={0–0} }","ama":"Leyendecker S, Maslovskaya S, Ober-Blöbaum S, Almagro RTSM de, Szemenyei FO. A new Lagrangian approach to control affine systems with a quadratic Lagrange term. Journal of Computational Dynamics. 2024;0(0):0-0. doi:10.3934/jcd.2024017","mla":"Leyendecker, Sigrid, et al. “A New Lagrangian Approach to Control Affine Systems with a Quadratic Lagrange Term.” Journal of Computational Dynamics, vol. 0, no. 0, American Institute of Mathematical Sciences (AIMS), 2024, pp. 0–0, doi:10.3934/jcd.2024017."},"oa":"1","article_type":"original","publication_status":"published","date_updated":"2024-03-28T16:07:34Z","author":[{"last_name":"Leyendecker","first_name":"Sigrid","full_name":"Leyendecker, Sigrid"},{"last_name":"Maslovskaya","first_name":"Sofya","full_name":"Maslovskaya, Sofya","id":"87909"},{"full_name":"Ober-Blöbaum, Sina","first_name":"Sina","last_name":"Ober-Blöbaum","id":"16494"},{"last_name":"Almagro","first_name":"Rodrigo T. Sato Martín de","full_name":"Almagro, Rodrigo T. Sato Martín de"},{"full_name":"Szemenyei, Flóra Orsolya","first_name":"Flóra Orsolya","last_name":"Szemenyei"}],"publication_identifier":{"issn":["2158-2491","2158-2505"]},"year":"2024","title":"A new Lagrangian approach to control affine systems with a quadratic Lagrange term","doi":"10.3934/jcd.2024017","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1","url":"https://www.aimsciences.org/article/doi/10.3934/jcd.2024017"}],"abstract":[{"text":"In this work, we consider optimal control problems for mechanical systems with fixed initial and free final state and a quadratic Lagrange term. Specifically, the dynamics is described by a second order ODE containing an affine control term. Classically, Pontryagin's maximum principle gives necessary optimality conditions for the optimal control problem. For smooth problems, alternatively, a variational approach based on an augmented objective can be followed. Here, we propose a new Lagrangian approach leading to equivalent necessary optimality conditions in the form of Euler-Lagrange equations. Thus, the differential geometric structure (similar to classical Lagrangian dynamics) can be exploited in the framework of optimal control problems. In particular, the formulation enables the symplectic discretisation of the optimal control problem via variational integrators in a straightforward way.","lang":"eng"}],"issue":"0","publication":"Journal of Computational Dynamics","department":[{"_id":"636"}],"type":"journal_article","keyword":["Optimal control problem","Lagrangian system","Hamiltonian system","Variations","Pontryagin's maximum principle."],"date_created":"2024-03-28T15:58:02Z"},{"oa":"1","external_id":{"arxiv":["2407.07642"]},"project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"file_date_updated":"2024-07-10T13:39:32Z","citation":{"mla":"Offen, Christian. Machine Learning of Discrete Field Theories with Guaranteed Convergence and Uncertainty Quantification.","ama":"Offen C. Machine learning of discrete field theories with guaranteed convergence and uncertainty quantification.","bibtex":"@article{Offen, title={Machine learning of discrete field theories with guaranteed convergence and uncertainty quantification}, author={Offen, Christian} }","apa":"Offen, C. (n.d.). Machine learning of discrete field theories with guaranteed convergence and uncertainty quantification.","ieee":"C. Offen, “Machine learning of discrete field theories with guaranteed convergence and uncertainty quantification.” .","short":"C. Offen, (n.d.).","chicago":"Offen, Christian. “Machine Learning of Discrete Field Theories with Guaranteed Convergence and Uncertainty Quantification,” n.d."},"user_id":"85279","ddc":["510"],"page":"28","_id":"55159","has_accepted_license":"1","status":"public","keyword":["System identification","inverse problem of variational calculus","Gaussian process","Lagrangian learning","physics informed machine learning","geometry aware learning"],"type":"preprint","department":[{"_id":"636"}],"file":[{"title":"Machine learning of discrete field theories with guaranteed convergence and uncertainty quantification","content_type":"application/pdf","file_id":"55160","date_updated":"2024-07-10T13:39:32Z","relation":"main_file","access_level":"open_access","file_size":4569314,"file_name":"L_Collocation.pdf","description":"We introduce a method based on Gaussian process regression to identify discrete\nvariational principles from observed solutions of a field theory. The method is based on the data-based identification of a discrete Lagrangian density. It is a geometric machine learning technique in the sense that the variational structure of the true field theory is reflected in the data-driven model by design.\nWe provide a rigorous convergence statement of the method.\nThe proof circumvents challenges posed by the ambiguity of discrete Lagrangian densities in the inverse problem of variational calculus.\nMoreover, our method can be used to quantify model uncertainty in the equations of motions and any linear observable of the discrete field theory.\nThis is illustrated on the example of the discrete wave equation and Schrödinger equation.\nThe article constitutes an extension of our previous article for the data-driven identification of (discrete) Lagrangians for variational dynamics from an ode setting to the setting of discrete pdes.","date_created":"2024-07-10T13:39:32Z","creator":"coffen"}],"date_created":"2024-07-10T13:43:50Z","abstract":[{"lang":"eng","text":"We introduce a method based on Gaussian process regression to identify discrete variational principles from observed solutions of a field theory. The method is based on the data-based identification of a discrete Lagrangian density. It is a geometric machine learning technique in the sense that the variational structure of the true field theory is reflected in the data-driven model by design. We provide a rigorous convergence statement of the method. The proof circumvents challenges posed by the ambiguity of discrete Lagrangian densities in the inverse problem of variational calculus.\r\nMoreover, our method can be used to quantify model uncertainty in the equations of motions and any linear observable of the discrete field theory. This is illustrated on the example of the discrete wave equation and Schrödinger equation.\r\nThe article constitutes an extension of our previous article arXiv:2404.19626 for the data-driven identification of (discrete) Lagrangians for variational dynamics from an ode setting to the setting of discrete pdes."}],"related_material":{"link":[{"description":"GitHub","url":"https://github.com/Christian-Offen/Lagrangian_GP_PDE","relation":"software"}]},"language":[{"iso":"eng"}],"publication_status":"submitted","date_updated":"2024-08-12T13:43:32Z","title":"Machine learning of discrete field theories with guaranteed convergence and uncertainty quantification","year":"2024","author":[{"id":"85279","first_name":"Christian","orcid":"0000-0002-5940-8057","last_name":"Offen","full_name":"Offen, Christian"}]},{"abstract":[{"lang":"ger","text":"Die vorliegende Dissertation beschreibt das Konzept und den Entwicklungsprozess eines Lichtsignalanlagenregelungssystems bis zur Realumsetzung. Das Regelungssystem, welches im Rahmen des Pilotprojekts Schlosskreuzung entstanden ist, besteht dabei aus zwei untereinander abgestimmten Methoden zur Echtzeit-Verkehrsrekonstruktion und zur modellprädiktiven Regelung des Verkehrssystems anhand der vorhandenen Lichtsignalanlagen. Die Echtzeit-Verkehrsrekonstruktion approximiert dabei simulationsbasiert den aktuellen Verkehrszustand anhand gegebener Messdaten über dynamische Verkehrszuweisungen. Die entwickelte mehrstufige Lichtsignalanlagenregelung nutzt ein Fuzzy-System zur Phasenvorauswahl, um anschließend über eine modellprädiktive Regelung das nichtlineare Problem mit dem Ergebnis der optimalen Kombinationen von Phasen und Schaltzeitpunkten zu lösen. Das Regelungssystem wird in dieser Arbeit anhand eines ausgewählten Verkehrsgebiets zunächst rein simulativ getestet und mit dem vorliegenden Bestandsverfahren verglichen. Im Anschluss an die prototypische Inbetriebnahme wird dieser Vergleich durch die Feldtests abgeschlossen. Entsprechende Ergebnisse zeigen das große Potential der Entwicklung hinsichtlich der Reduktion von Kriterien wie Emissionen oder Wartezeiten und gleichzeitig den Handlungsbedarf für eine standardmäßige Nutzung."},{"text":"This dissertation describes the concept and the development process of a traffic signal control system up to the real implementation.The control system, which was developed in the context of the Pilotprojekt Schlosskreuzung, consists of two mutually coordinated methods for real-time traffic reconstruction and for model-predictive control of the traffic system based on the existing traffic light systems.The real-time traffic reconstruction approximates the current traffic state simulation-based using given measurement data via dynamic traffic assignments.The designed multi-stage traffic signal control system uses a fuzzy-system for phase preselection and subsequently employs model predictive control to solve the nonlinear problem resulting in the optimal combinations of phases and switching times.In this work, the control system is first tested purely simulatively on the basis of a selected traffic area and compared with the existing inventory method.Following the prototypical commissioning, this comparison is finalised by field tests.Corresponding results show the great potential of the development with regard to the reduction of criteria such as emissions or waiting times and at the same time the need for action for use as standard.","lang":"eng"}],"type":"dissertation","keyword":["Traffic Light System Control","Model Predictive Control"],"department":[{"_id":"153"}],"file":[{"creator":"kmalena","date_created":"2024-10-30T13:57:54Z","file_name":"Konzipierung, Analyse und Realumsetzung eines mehrstufigen modellprädiktiven Lichtsignalanlagenregelungssystems-1.pdf","file_size":14902500,"access_level":"closed","relation":"main_file","date_updated":"2024-10-30T13:57:54Z","file_id":"56828","success":1,"content_type":"application/pdf"}],"date_created":"2024-06-03T10:42:56Z","publication_status":"published","date_updated":"2024-10-30T14:41:24Z","intvolume":" 422","title":"Konzipierung, Analyse und Realumsetzung eines mehrstufigen modellprädiktiven Lichtsignalanlagenregelungssystems","year":"2024","author":[{"full_name":"Malena, Kevin","last_name":"Malena","orcid":"0000-0003-1183-4679","first_name":"Kevin","id":"36303"}],"publication_identifier":{"isbn":["978-3-947647-41-5"]},"doi":"10.17619/UNIPB/1-2021","series_title":"Verlagsschriftenreihe des Heinz Nixdorf Instituts","language":[{"iso":"ger"}],"file_date_updated":"2024-10-30T13:57:54Z","citation":{"short":"K. Malena, Konzipierung, Analyse und Realumsetzung eines mehrstufigen modellprädiktiven Lichtsignalanlagenregelungssystems, Heinz Nixdorf Institut, Universität Paderborn, 2024.","chicago":"Malena, Kevin. Konzipierung, Analyse und Realumsetzung eines mehrstufigen modellprädiktiven Lichtsignalanlagenregelungssystems. Vol. 422. Verlagsschriftenreihe des Heinz Nixdorf Instituts. Heinz Nixdorf Institut, Universität Paderborn, 2024. https://doi.org/10.17619/UNIPB/1-2021.","apa":"Malena, K. (2024). Konzipierung, Analyse und Realumsetzung eines mehrstufigen modellprädiktiven Lichtsignalanlagenregelungssystems (Vol. 422). Heinz Nixdorf Institut, Universität Paderborn. https://doi.org/10.17619/UNIPB/1-2021","ieee":"K. Malena, Konzipierung, Analyse und Realumsetzung eines mehrstufigen modellprädiktiven Lichtsignalanlagenregelungssystems, vol. 422. Heinz Nixdorf Institut, Universität Paderborn, 2024.","ama":"Malena K. Konzipierung, Analyse und Realumsetzung eines mehrstufigen modellprädiktiven Lichtsignalanlagenregelungssystems. Vol 422. Heinz Nixdorf Institut, Universität Paderborn; 2024. doi:10.17619/UNIPB/1-2021","bibtex":"@book{Malena_2024, series={Verlagsschriftenreihe des Heinz Nixdorf Instituts}, title={Konzipierung, Analyse und Realumsetzung eines mehrstufigen modellprädiktiven Lichtsignalanlagenregelungssystems}, volume={422}, DOI={10.17619/UNIPB/1-2021}, publisher={Heinz Nixdorf Institut, Universität Paderborn}, author={Malena, Kevin}, year={2024}, collection={Verlagsschriftenreihe des Heinz Nixdorf Instituts} }","mla":"Malena, Kevin. Konzipierung, Analyse und Realumsetzung eines mehrstufigen modellprädiktiven Lichtsignalanlagenregelungssystems. Heinz Nixdorf Institut, Universität Paderborn, 2024, doi:10.17619/UNIPB/1-2021."},"supervisor":[{"id":"552","first_name":"Ansgar","last_name":"Trächtler","full_name":"Trächtler, Ansgar"},{"first_name":"Jürgen","last_name":"Krimmling","full_name":"Krimmling, Jürgen"}],"has_accepted_license":"1","status":"public","user_id":"36303","ddc":["620"],"volume":422,"page":"207","publisher":"Heinz Nixdorf Institut, Universität Paderborn","_id":"54552"},{"has_accepted_license":"1","conference":{"end_date":"2024-10-18","start_date":"2024-10-16","name":" IEEE International Symposium on Systems Engineering 2024","location":"Perugia"},"status":"public","user_id":"405","_id":"57300","publisher":"IEEE","project":[{"name":"CREXDATA: CREXDATA: Kritische Maßnahmenplanung über extreme Datenmengen","_id":"516","grant_number":"101092749"}],"quality_controlled":"1","citation":{"ieee":"I. Gräßler, M. Ebel, and J. Pottebaum, “Model-based planning of test cases and test scenarios to support engineering of Cyber-Physical Systems,” presented at the IEEE International Symposium on Systems Engineering 2024, Perugia, 2024, doi: 10.1109/isse63315.2024.10741135.","mla":"Gräßler, Iris, et al. “Model-Based Planning of Test Cases and Test Scenarios to Support Engineering of Cyber-Physical Systems.” 2024 IEEE International Symposium on Systems Engineering (ISSE), IEEE, 2024, doi:10.1109/isse63315.2024.10741135.","apa":"Gräßler, I., Ebel, M., & Pottebaum, J. (2024). Model-based planning of test cases and test scenarios to support engineering of Cyber-Physical Systems. 2024 IEEE International Symposium on Systems Engineering (ISSE). IEEE International Symposium on Systems Engineering 2024, Perugia. https://doi.org/10.1109/isse63315.2024.10741135","bibtex":"@inproceedings{Gräßler_Ebel_Pottebaum_2024, title={Model-based planning of test cases and test scenarios to support engineering of Cyber-Physical Systems}, DOI={10.1109/isse63315.2024.10741135}, booktitle={2024 IEEE International Symposium on Systems Engineering (ISSE)}, publisher={IEEE}, author={Gräßler, Iris and Ebel, Marcel and Pottebaum, Jens}, year={2024} }","chicago":"Gräßler, Iris, Marcel Ebel, and Jens Pottebaum. “Model-Based Planning of Test Cases and Test Scenarios to Support Engineering of Cyber-Physical Systems.” In 2024 IEEE International Symposium on Systems Engineering (ISSE). IEEE, 2024. https://doi.org/10.1109/isse63315.2024.10741135.","ama":"Gräßler I, Ebel M, Pottebaum J. Model-based planning of test cases and test scenarios to support engineering of Cyber-Physical Systems. In: 2024 IEEE International Symposium on Systems Engineering (ISSE). IEEE; 2024. doi:10.1109/isse63315.2024.10741135","short":"I. Gräßler, M. Ebel, J. Pottebaum, in: 2024 IEEE International Symposium on Systems Engineering (ISSE), IEEE, 2024."},"oa":"1","publication_status":"published","date_updated":"2025-01-17T16:20:14Z","author":[{"full_name":"Gräßler, Iris","last_name":"Gräßler","orcid":"0000-0001-5765-971X","first_name":"Iris","id":"47565"},{"id":"81788","first_name":"Marcel","last_name":"Ebel","orcid":"https://orcid.org/0009-0007-5400-4436","full_name":"Ebel, Marcel"},{"full_name":"Pottebaum, Jens","last_name":"Pottebaum","first_name":"Jens","orcid":"http://orcid.org/0000-0001-8778-2989","id":"405"}],"year":"2024","title":"Model-based planning of test cases and test scenarios to support engineering of Cyber-Physical Systems","doi":"10.1109/isse63315.2024.10741135","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10741135&tag=1","open_access":"1"}],"abstract":[{"lang":"eng","text":"Engineering methodologies for Cyber-Physical Systems (CPS) call for planning simulations and physical testing in early phases of product creation. Even in Model-Based Systems Engineering, there is a lack of systematic support that results in avoidable costs and iterations in the engineering process. Planning test cases and test scenarios along the product engineering process is not sufficiently integrated in terms of support especially for verification and validation engineers. Based on a systematic literature review, concepts for model-based planning of testing are developed. Characteristics of test cases and test scenarios of CPS are systematically identified. Generic templates for the creation of test cases and scenarios are derived. Based on the templates, a System Modeling Language (SysML) profile extension is developed which enables intuitive modelling of test cases and scenarios. The SysML profile is evaluated in a sample System-of-Systems in Disaster Response. It subsumes various types of sensor systems like rescue robotics, data science algorithms and visualization technologies like Augmented Reality to support decisions in extreme weather events. The templates and SysML profile significantly add value for engineers in the early and systematic planning of verification and validation."}],"publication":"2024 IEEE International Symposium on Systems Engineering (ISSE)","department":[{"_id":"152"}],"keyword":["Systems Engineering","Systems verification","System testing"],"type":"conference","date_created":"2024-11-20T20:06:22Z"},{"language":[{"iso":"eng"}],"_id":"56636","main_file_link":[{"url":"https://www.researchgate.net/publication/382338551_Overcoming_Lemon_Markets_with_Business_Reputation_Ecosystem_-A_Multi-agent_Simulation_on_Monetary_Ratings_Research_Paper","open_access":"1"}],"user_id":"83557","conference":{"location":"Würzburg"},"jel":["C30","A12","D4","D82","L14"],"author":[{"first_name":"Ulvi","last_name":"Ibrahimli","full_name":"Ibrahimli, Ulvi"},{"full_name":"Hemmrich, Simon","first_name":"Simon","last_name":"Hemmrich"},{"full_name":"Zauke, Simon","last_name":"Zauke","first_name":"Simon"},{"last_name":"Winkelmann","first_name":"Axel","full_name":"Winkelmann, Axel"}],"year":"2024","status":"public","title":"Overcoming Lemon Markets with Business Reputation Ecosystem – A Multi-agent Simulation on Monetary Ratings","date_updated":"2026-04-02T04:31:53Z","publication_status":"published","date_created":"2024-10-16T07:36:56Z","oa":"1","type":"conference","keyword":["Reputation System","Payment as Rating","Multi-Agent Simulation","Lemon Markets"],"citation":{"apa":"Ibrahimli, U., Hemmrich, S., Zauke, S., & Winkelmann, A. (2024). Overcoming Lemon Markets with Business Reputation Ecosystem – A Multi-agent Simulation on Monetary Ratings. 19. Internationale Tagung Wirtschaftsinformatik (WI24).","ieee":"U. Ibrahimli, S. Hemmrich, S. Zauke, and A. Winkelmann, “Overcoming Lemon Markets with Business Reputation Ecosystem – A Multi-agent Simulation on Monetary Ratings,” Würzburg, 2024.","chicago":"Ibrahimli, Ulvi, Simon Hemmrich, Simon Zauke, and Axel Winkelmann. “Overcoming Lemon Markets with Business Reputation Ecosystem – A Multi-Agent Simulation on Monetary Ratings.” In 19. Internationale Tagung Wirtschaftsinformatik (WI24), 2024.","short":"U. Ibrahimli, S. Hemmrich, S. Zauke, A. Winkelmann, in: 19. Internationale Tagung Wirtschaftsinformatik (WI24), 2024.","mla":"Ibrahimli, Ulvi, et al. “Overcoming Lemon Markets with Business Reputation Ecosystem – A Multi-Agent Simulation on Monetary Ratings.” 19. Internationale Tagung Wirtschaftsinformatik (WI24), 2024.","ama":"Ibrahimli U, Hemmrich S, Zauke S, Winkelmann A. Overcoming Lemon Markets with Business Reputation Ecosystem – A Multi-agent Simulation on Monetary Ratings. In: 19. Internationale Tagung Wirtschaftsinformatik (WI24). ; 2024.","bibtex":"@inproceedings{Ibrahimli_Hemmrich_Zauke_Winkelmann_2024, title={Overcoming Lemon Markets with Business Reputation Ecosystem – A Multi-agent Simulation on Monetary Ratings}, booktitle={19. Internationale Tagung Wirtschaftsinformatik (WI24)}, author={Ibrahimli, Ulvi and Hemmrich, Simon and Zauke, Simon and Winkelmann, Axel}, year={2024} }"},"publication":"19. Internationale Tagung Wirtschaftsinformatik (WI24)","quality_controlled":"1","abstract":[{"text":"Abstract. Business reputation ecosystems are a widely untapped research field. In these ecosystems, agents can selectively exchange (monetary) ratings to in-form about the experienced quality in a market. We build a model for conducting a multi-agent simulation that can be used to simulate and evaluate business rep-utation ecosystems as a new system class. We explore the factual occurring vol-untary payment to create positive (pay) or negative ratings (no pay), selling rat-ings selectively to alleviate information asymmetry, and the workings of counter-ratings to prevent buyers' dishonest ratings. Thereby, we analyze, among others, agent profitability, the occurrence of dishonest ratings, and reputation bias and sensitivity. The results provide simulation-based empirical evidence that the con-cept of monetary reputation systems provides necessary incentives for participa-tion, and high-quality sellers and honest buyers benefit from such a system. The results indicate that counter-ratings prompt buyers","lang":"eng"}]},{"citation":{"ieee":"T. Rust, D. Jung, K. Langer, and D. Kuckling, “Stimuli‐accelerated polymeric drug delivery systems,” Polymer International, vol. 72, no. 1, pp. 5–19, 2023, doi: 10.1002/pi.6474.","apa":"Rust, T., Jung, D., Langer, K., & Kuckling, D. (2023). Stimuli‐accelerated polymeric drug delivery systems. Polymer International, 72(1), 5–19. https://doi.org/10.1002/pi.6474","chicago":"Rust, Tarik, Dimitri Jung, Klaus Langer, and Dirk Kuckling. “Stimuli‐accelerated Polymeric Drug Delivery Systems.” Polymer International 72, no. 1 (2023): 5–19. https://doi.org/10.1002/pi.6474.","short":"T. Rust, D. Jung, K. Langer, D. Kuckling, Polymer International 72 (2023) 5–19.","mla":"Rust, Tarik, et al. “Stimuli‐accelerated Polymeric Drug Delivery Systems.” Polymer International, vol. 72, no. 1, Wiley, 2023, pp. 5–19, doi:10.1002/pi.6474.","bibtex":"@article{Rust_Jung_Langer_Kuckling_2023, title={Stimuli‐accelerated polymeric drug delivery systems}, volume={72}, DOI={10.1002/pi.6474}, number={1}, journal={Polymer International}, publisher={Wiley}, author={Rust, Tarik and Jung, Dimitri and Langer, Klaus and Kuckling, Dirk}, year={2023}, pages={5–19} }","ama":"Rust T, Jung D, Langer K, Kuckling D. Stimuli‐accelerated polymeric drug delivery systems. Polymer International. 2023;72(1):5-19. doi:10.1002/pi.6474"},"status":"public","user_id":"94","volume":72,"page":"5-19","publisher":"Wiley","_id":"35657","abstract":[{"text":"The controlled delivery of active pharmaceutical ingredients to the site of disease represents a major challenge in drug therapy. Particularly when drugs have to be transported across biological barriers, suitable drug delivery systems are of importance. In recent years responsive delivery systems have been developed which enable a controlled drug release depending on internal or external stimuli such as changes in pH, redox environment or light and temperature. In some studies delivery systems with reactivity against two different stimuli were established either to enhance the response by synergies of the stimuli or to broaden the window of possible trigger events. In the present review numerous exciting developments of pH-, light- and redox-cleavable polymers suitable for the preparation of smart delivery systems are described. The review discusses the different stimuli that can be used for a controlled drug release of polymer-based delivery systems. It puts a focus on the different polymers described for the preparation of stimuli-sensitive systems, their preparation techniques as well as their stimuli-responsive degradation. © 2022 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.","lang":"eng"}],"issue":"1","publication":"Polymer International","keyword":["drug delivery system","stimuli","polymer","cleavable"],"type":"journal_article","department":[{"_id":"163"}],"date_created":"2023-01-10T08:25:22Z","date_updated":"2023-01-10T08:31:31Z","publication_status":"published","intvolume":" 72","article_type":"original","title":"Stimuli‐accelerated polymeric drug delivery systems","year":"2023","publication_identifier":{"issn":["0959-8103","1097-0126"]},"author":[{"last_name":"Rust","first_name":"Tarik","full_name":"Rust, Tarik"},{"last_name":"Jung","first_name":"Dimitri","full_name":"Jung, Dimitri"},{"full_name":"Langer, Klaus","first_name":"Klaus","last_name":"Langer"},{"id":"287","last_name":"Kuckling","first_name":"Dirk","full_name":"Kuckling, Dirk"}],"doi":"10.1002/pi.6474","main_file_link":[{"url":"https://onlinelibrary.wiley.com/doi/10.1002/pi.6474"}],"language":[{"iso":"eng"}]},{"oa":"1","keyword":["Trust","Risk","Reputation System","Blockchain Technology","Business Reputation System."],"type":"conference","date_created":"2023-12-18T12:55:32Z","quality_controlled":"1","abstract":[{"text":"Reputation is indispensable for online business since it supports customers in their buying decisions and\r\nallows sellers to justify premium prices. While IS research has investigated reputation systems mainly\r\nas review systems on online platforms for business-to-consumer (B2C) transactions, no proper solutions\r\nhave been developed for business-to-business (B2B) transactions yet. We use blockchain technology to\r\npropose a new class of reputation systems that apply ratings as voluntary bonus payments: Before a\r\ntransaction is performed, customers commit to pay a bonus that is granted if a service provider has\r\nperformed a service properly. As opposed to rival reputation systems that build on cumulated ratings\r\nor reviews, our system enables monetized reputation mechanisms that are inextricably linked with online\r\ntransactions. We expect this system class to provide more trustworthy ratings, which might reduce\r\nagency costs and serve quality providers to establish a reputation towards new customers, building on\r\nsecond-order trust.","lang":"eng"}],"citation":{"apa":"Hemmrich, S. (2023). Business Reputation Systems based on Blockchain Technology—A Risky Advance. Proceedings of 31st European Conference on Information Systems (ECIS 2023).","ieee":"S. Hemmrich, “Business Reputation Systems based on Blockchain Technology—A Risky Advance,” Kristiansand, 2023.","chicago":"Hemmrich, Simon. “Business Reputation Systems Based on Blockchain Technology—A Risky Advance.” In Proceedings of 31st European Conference on Information Systems (ECIS 2023), 2023.","short":"S. Hemmrich, in: Proceedings of 31st European Conference on Information Systems (ECIS 2023), 2023.","mla":"Hemmrich, Simon. “Business Reputation Systems Based on Blockchain Technology—A Risky Advance.” Proceedings of 31st European Conference on Information Systems (ECIS 2023), 2023.","ama":"Hemmrich S. Business Reputation Systems based on Blockchain Technology—A Risky Advance. In: Proceedings of 31st European Conference on Information Systems (ECIS 2023). ; 2023.","bibtex":"@inproceedings{Hemmrich_2023, title={Business Reputation Systems based on Blockchain Technology—A Risky Advance}, booktitle={Proceedings of 31st European Conference on Information Systems (ECIS 2023)}, author={Hemmrich, Simon}, year={2023} }"},"publication":"Proceedings of 31st European Conference on Information Systems (ECIS 2023)","user_id":"83557","language":[{"iso":"eng"}],"_id":"49785","main_file_link":[{"url":"https://aisel.aisnet.org/ecis2023_rip/51/","open_access":"1"}],"date_updated":"2024-04-15T13:33:21Z","publication_status":"published","conference":{"location":"Kristiansand"},"jel":["D47","D82","D81","E42"],"author":[{"first_name":"Simon","last_name":"Hemmrich","full_name":"Hemmrich, Simon","id":"83557"}],"title":"Business Reputation Systems based on Blockchain Technology—A Risky Advance","status":"public","year":"2023"},{"abstract":[{"text":"The article shows how to learn models of dynamical systems from data which are governed by an unknown variational PDE. Rather than employing reduction techniques, we learn a discrete field theory governed by a discrete Lagrangian density $L_d$ that is modelled as a neural network. Careful regularisation of the loss function for training $L_d$ is necessary to obtain a field theory that is suitable for numerical computations: we derive a regularisation term which optimises the solvability of the discrete Euler--Lagrange equations. Secondly, we develop a method to find solutions to machine learned discrete field theories which constitute travelling waves of the underlying continuous PDE.","lang":"eng"}],"related_material":{"link":[{"url":"https://github.com/Christian-Offen/LagrangianDensityML","relation":"software","description":"GitHub"}]},"publication":"Geometric Science of Information","department":[{"_id":"636"}],"type":"conference","keyword":["System identification","discrete Lagrangians","travelling waves"],"date_created":"2023-02-16T11:32:48Z","file":[{"description":"The article shows how to learn models of dynamical systems\nfrom data which are governed by an unknown variational PDE. Rather\nthan employing reduction techniques, we learn a discrete field theory\ngoverned by a discrete Lagrangian density Ld that is modelled as a neural network. Careful regularisation of the loss function for training Ld is\nnecessary to obtain a field theory that is suitable for numerical computations: we derive a regularisation term which optimises the solvability of\nthe discrete Euler–Lagrange equations. Secondly, we develop a method to\nfind solutions to machine learned discrete field theories which constitute\ntravelling waves of the underlying continuous PDE.","date_created":"2023-08-02T12:04:17Z","creator":"coffen","title":"Learning discrete Lagrangians for variational PDEs from data and detection of travelling waves","file_id":"46273","content_type":"application/pdf","relation":"main_file","date_updated":"2023-08-02T12:04:17Z","file_name":"LDensityLearning.pdf","access_level":"open_access","file_size":1938962}],"intvolume":" 14071","date_updated":"2024-08-12T13:46:29Z","publication_status":"published","publication_identifier":{"eisbn":["978-3-031-38271-0"]},"author":[{"orcid":"0000-0002-5940-8057","first_name":"Christian","last_name":"Offen","full_name":"Offen, Christian","id":"85279"},{"last_name":"Ober-Blöbaum","first_name":"Sina","full_name":"Ober-Blöbaum, Sina","id":"16494"}],"year":"2023","title":"Learning discrete Lagrangians for variational PDEs from data and detection of travelling waves","doi":"10.1007/978-3-031-38271-0_57","language":[{"iso":"eng"}],"series_title":"Lecture Notes in Computer Science (LNCS)","project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"quality_controlled":"1","citation":{"ama":"Offen C, Ober-Blöbaum S. Learning discrete Lagrangians for variational PDEs from data and detection of travelling waves. In: Nielsen F, Barbaresco F, eds. Geometric Science of Information. Vol 14071. Lecture Notes in Computer Science (LNCS). Springer, Cham.; 2023:569-579. doi:10.1007/978-3-031-38271-0_57","bibtex":"@inproceedings{Offen_Ober-Blöbaum_2023, series={Lecture Notes in Computer Science (LNCS)}, title={Learning discrete Lagrangians for variational PDEs from data and detection of travelling waves}, volume={14071}, DOI={10.1007/978-3-031-38271-0_57}, booktitle={Geometric Science of Information}, publisher={Springer, Cham.}, author={Offen, Christian and Ober-Blöbaum, Sina}, editor={Nielsen, F and Barbaresco, F}, year={2023}, pages={569–579}, collection={Lecture Notes in Computer Science (LNCS)} }","mla":"Offen, Christian, and Sina Ober-Blöbaum. “Learning Discrete Lagrangians for Variational PDEs from Data and Detection of Travelling Waves.” Geometric Science of Information, edited by F Nielsen and F Barbaresco, vol. 14071, Springer, Cham., 2023, pp. 569–79, doi:10.1007/978-3-031-38271-0_57.","chicago":"Offen, Christian, and Sina Ober-Blöbaum. “Learning Discrete Lagrangians for Variational PDEs from Data and Detection of Travelling Waves.” In Geometric Science of Information, edited by F Nielsen and F Barbaresco, 14071:569–79. Lecture Notes in Computer Science (LNCS). Springer, Cham., 2023. https://doi.org/10.1007/978-3-031-38271-0_57.","short":"C. Offen, S. Ober-Blöbaum, in: F. Nielsen, F. Barbaresco (Eds.), Geometric Science of Information, Springer, Cham., 2023, pp. 569–579.","apa":"Offen, C., & Ober-Blöbaum, S. (2023). Learning discrete Lagrangians for variational PDEs from data and detection of travelling waves. In F. Nielsen & F. Barbaresco (Eds.), Geometric Science of Information (Vol. 14071, pp. 569–579). Springer, Cham. https://doi.org/10.1007/978-3-031-38271-0_57","ieee":"C. Offen and S. Ober-Blöbaum, “Learning discrete Lagrangians for variational PDEs from data and detection of travelling waves,” in Geometric Science of Information, Saint-Malo, Palais du Grand Large, France, 2023, vol. 14071, pp. 569–579, doi: 10.1007/978-3-031-38271-0_57."},"file_date_updated":"2023-08-02T12:04:17Z","oa":"1","external_id":{"arxiv":["2302.08232 "]},"has_accepted_license":"1","conference":{"location":"Saint-Malo, Palais du Grand Large, France","start_date":"2023-08-30","name":" GSI'23 6th International Conference on Geometric Science of Information","end_date":"2023-09-01"},"status":"public","editor":[{"full_name":"Nielsen, F","first_name":"F","last_name":"Nielsen"},{"full_name":"Barbaresco, F","last_name":"Barbaresco","first_name":"F"}],"volume":14071,"ddc":["510"],"user_id":"85279","publisher":"Springer, Cham.","_id":"42163","page":"569-579"},{"date_created":"2023-04-13T09:11:33Z","department":[{"_id":"9"},{"_id":"321"},{"_id":"149"}],"type":"journal_article","keyword":["Life Cycle Engineering","Life Cycle Assessment","Lightweight Design","Prospective LCA","Future-oriented LCA","Energy System","Material production","Sustainable production"],"publication":"Energies","issue":"8","abstract":[{"lang":"eng","text":"Lightweight design is a common approach to reduce energy demand in the use stage of vehicles. The production of lightweight materials is usually associated with an increase in energy demand, so the environmental impacts of lightweight structures need to be assessed holistically using a life cycle assessment. To estimate the life cycle environmental impacts of a product in its developmental stage, for example, by life cycle engineering, future changes in relevant influencing factors must be considered. Prospective life cycle assessment provides methods for integrating future scenarios into life cycle assessment studies. However, approaches for integrating prospective life cycle assessment into product development are limited. The objective of this work is to provide the methodological foundation for integrating future scenarios of relevant influencing factors in the development of lightweight structures. The applicability of the novel methodology is demonstrated by a case study of a structural component in a steel, aluminium, and hybrid design. The results show that appropriate decarbonisation measures can reduce the life cycle greenhouse gas emissions by up to 95 percent until 2050. We also found that shifts in the environmentally optimal design are possible in future scenarios. Therefore, the methodology and data provided contribute to improved decision-making in product development."}],"language":[{"iso":"eng"}],"article_number":"3371","main_file_link":[{"open_access":"1","url":"https://www.mdpi.com/1996-1073/16/8/3371"}],"doi":"10.3390/en16083371","publication_identifier":{"issn":["1996-1073"]},"author":[{"id":"44763","full_name":"Ostermann, Moritz","first_name":"Moritz","last_name":"Ostermann","orcid":"https://orcid.org/0000-0003-1146-0443"},{"full_name":"Grenz, Julian","last_name":"Grenz","first_name":"Julian"},{"first_name":"Marcel","last_name":"Triebus","full_name":"Triebus, Marcel","id":"66036"},{"last_name":"Cerdas","first_name":"Felipe","full_name":"Cerdas, Felipe"},{"id":"338","last_name":"Marten","first_name":"Thorsten","full_name":"Marten, Thorsten"},{"id":"553","full_name":"Tröster, Thomas","last_name":"Tröster","first_name":"Thomas"},{"full_name":"Herrmann, Christoph","first_name":"Christoph","last_name":"Herrmann"}],"title":"Integrating Prospective Scenarios in Life Cycle Engineering: Case Study of Lightweight Structures","year":"2023","intvolume":" 16","publication_status":"published","date_updated":"2023-04-13T09:19:56Z","oa":"1","citation":{"bibtex":"@article{Ostermann_Grenz_Triebus_Cerdas_Marten_Tröster_Herrmann_2023, title={Integrating Prospective Scenarios in Life Cycle Engineering: Case Study of Lightweight Structures}, volume={16}, DOI={10.3390/en16083371}, number={83371}, journal={Energies}, publisher={MDPI AG}, author={Ostermann, Moritz and Grenz, Julian and Triebus, Marcel and Cerdas, Felipe and Marten, Thorsten and Tröster, Thomas and Herrmann, Christoph}, year={2023} }","ama":"Ostermann M, Grenz J, Triebus M, et al. Integrating Prospective Scenarios in Life Cycle Engineering: Case Study of Lightweight Structures. Energies. 2023;16(8). doi:10.3390/en16083371","mla":"Ostermann, Moritz, et al. “Integrating Prospective Scenarios in Life Cycle Engineering: Case Study of Lightweight Structures.” Energies, vol. 16, no. 8, 3371, MDPI AG, 2023, doi:10.3390/en16083371.","chicago":"Ostermann, Moritz, Julian Grenz, Marcel Triebus, Felipe Cerdas, Thorsten Marten, Thomas Tröster, and Christoph Herrmann. “Integrating Prospective Scenarios in Life Cycle Engineering: Case Study of Lightweight Structures.” Energies 16, no. 8 (2023). https://doi.org/10.3390/en16083371.","short":"M. Ostermann, J. Grenz, M. Triebus, F. Cerdas, T. Marten, T. Tröster, C. Herrmann, Energies 16 (2023).","ieee":"M. Ostermann et al., “Integrating Prospective Scenarios in Life Cycle Engineering: Case Study of Lightweight Structures,” Energies, vol. 16, no. 8, Art. no. 3371, 2023, doi: 10.3390/en16083371.","apa":"Ostermann, M., Grenz, J., Triebus, M., Cerdas, F., Marten, T., Tröster, T., & Herrmann, C. (2023). Integrating Prospective Scenarios in Life Cycle Engineering: Case Study of Lightweight Structures. Energies, 16(8), Article 3371. https://doi.org/10.3390/en16083371"},"quality_controlled":"1","publisher":"MDPI AG","_id":"43464","volume":16,"user_id":"44763","status":"public"},{"article_type":"original","intvolume":" 199","date_updated":"2025-05-16T10:32:21Z","author":[{"id":"33108","last_name":"Sommer","first_name":"Christian","full_name":"Sommer, Christian"}],"publication_identifier":{"issn":["00059536"]},"title":"Der Hauptschulabschluss als sozial selektiver Hauptzulieferer des Übergangssystems","year":"2023","doi":"10.3278/BB2303W","language":[{"iso":"eng"}],"abstract":[{"text":"Über zwei Drittel der Anfänger*innen im Übergangssystem verfügen maximal über einen Hauptschul-/Mittelschulabschluss. Sie sind damit überrepräsentiert, was sich weniger durch ihre Kompetenzen als mit ihrem sozioökonomischen Status und klassenspezifischen Nachqualifizierungsverhalten erklären lässt.","lang":"ger"}],"publication":"Berufsbildung. Zeitschrift für Theorie-Praxis-Dialog","department":[{"_id":"397"}],"keyword":["Social inequality","Transition system"],"type":"journal_article","date_created":"2023-09-02T18:39:47Z","status":"public","volume":199,"user_id":"33108","_id":"46765","publisher":"wbv","page":"9-13","quality_controlled":"1","citation":{"bibtex":"@article{Sommer_2023, title={Der Hauptschulabschluss als sozial selektiver Hauptzulieferer des Übergangssystems}, volume={199}, DOI={10.3278/BB2303W}, journal={Berufsbildung. Zeitschrift für Theorie-Praxis-Dialog}, publisher={wbv}, author={Sommer, Christian}, year={2023}, pages={9–13} }","ama":"Sommer C. Der Hauptschulabschluss als sozial selektiver Hauptzulieferer des Übergangssystems. Berufsbildung Zeitschrift für Theorie-Praxis-Dialog. 2023;199:9-13. doi:10.3278/BB2303W","mla":"Sommer, Christian. “Der Hauptschulabschluss Als Sozial Selektiver Hauptzulieferer Des Übergangssystems.” Berufsbildung. Zeitschrift Für Theorie-Praxis-Dialog, vol. 199, wbv, 2023, pp. 9–13, doi:10.3278/BB2303W.","chicago":"Sommer, Christian. “Der Hauptschulabschluss Als Sozial Selektiver Hauptzulieferer Des Übergangssystems.” Berufsbildung. Zeitschrift Für Theorie-Praxis-Dialog 199 (2023): 9–13. https://doi.org/10.3278/BB2303W.","short":"C. Sommer, Berufsbildung. Zeitschrift Für Theorie-Praxis-Dialog 199 (2023) 9–13.","ieee":"C. Sommer, “Der Hauptschulabschluss als sozial selektiver Hauptzulieferer des Übergangssystems,” Berufsbildung. Zeitschrift für Theorie-Praxis-Dialog, vol. 199, pp. 9–13, 2023, doi: 10.3278/BB2303W.","apa":"Sommer, C. (2023). Der Hauptschulabschluss als sozial selektiver Hauptzulieferer des Übergangssystems. Berufsbildung. Zeitschrift Für Theorie-Praxis-Dialog, 199, 9–13. https://doi.org/10.3278/BB2303W"}},{"abstract":[{"lang":"eng","text":"In this paper, machine learning techniques will be used to classify different PCB layouts given their electromagnetic frequency spectra. These spectra result from a simulated near-field measurement of electric field strengths at different locations. Measured values consist of real and imaginary parts (amplitude and phase) in X, Y and Z directions. Training data was obtained in the time domain by varying transmission line geometries (size, distance and signaling). It was then transformed into the frequency domain and used as deep neural network input. Principal component analysis was applied to reduce the sample dimension. The results show that classifying different designs is possible with high accuracy based on synthetic data. Future work comprises measurements of real, custom-made PCB with varying parameters to adapt the simulation model and also test the neural network. Finally, the trained model could be used to give hints about the error’s cause when overshooting EMC limits."}],"publication":"2022 Kleinheubach Conference","keyword":["emc","pcb","electronic system development","machine learning","neural network"],"type":"conference","department":[{"_id":"59"},{"_id":"485"}],"date_created":"2022-11-24T14:21:17Z","date_updated":"2022-11-24T14:21:34Z","publication_status":"published","title":"AI Assisted Interference Classification to Improve EMC Troubleshooting in Electronic System Development","year":"2022","author":[{"full_name":"Maalouly, Jad","first_name":"Jad","last_name":"Maalouly"},{"first_name":"Dennis","last_name":"Hemker","full_name":"Hemker, Dennis"},{"full_name":"Hedayat, Christian","last_name":"Hedayat","first_name":"Christian"},{"full_name":"Rückert, Christian","last_name":"Rückert","first_name":"Christian"},{"full_name":"Kaufmann, Ivan","last_name":"Kaufmann","first_name":"Ivan"},{"full_name":"Olbrich, Marcel","last_name":"Olbrich","first_name":"Marcel"},{"id":"38240","last_name":"Lange","first_name":"Sven","full_name":"Lange, Sven"},{"full_name":"Mathis, Harald","first_name":"Harald","last_name":"Mathis"}],"publication_identifier":{"eisbn":["978-3-948571-07-8"]},"main_file_link":[{"url":"https://ieeexplore.ieee.org/document/9954484"}],"language":[{"iso":"eng"}],"project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"citation":{"ama":"Maalouly J, Hemker D, Hedayat C, et al. AI Assisted Interference Classification to Improve EMC Troubleshooting in Electronic System Development. In: 2022 Kleinheubach Conference. IEEE; 2022.","bibtex":"@inproceedings{Maalouly_Hemker_Hedayat_Rückert_Kaufmann_Olbrich_Lange_Mathis_2022, place={Miltenberg, Germany}, title={AI Assisted Interference Classification to Improve EMC Troubleshooting in Electronic System Development}, booktitle={2022 Kleinheubach Conference}, publisher={IEEE}, author={Maalouly, Jad and Hemker, Dennis and Hedayat, Christian and Rückert, Christian and Kaufmann, Ivan and Olbrich, Marcel and Lange, Sven and Mathis, Harald}, year={2022} }","mla":"Maalouly, Jad, et al. “AI Assisted Interference Classification to Improve EMC Troubleshooting in Electronic System Development.” 2022 Kleinheubach Conference, IEEE, 2022.","short":"J. Maalouly, D. Hemker, C. Hedayat, C. Rückert, I. Kaufmann, M. Olbrich, S. Lange, H. Mathis, in: 2022 Kleinheubach Conference, IEEE, Miltenberg, Germany, 2022.","chicago":"Maalouly, Jad, Dennis Hemker, Christian Hedayat, Christian Rückert, Ivan Kaufmann, Marcel Olbrich, Sven Lange, and Harald Mathis. “AI Assisted Interference Classification to Improve EMC Troubleshooting in Electronic System Development.” In 2022 Kleinheubach Conference. Miltenberg, Germany: IEEE, 2022.","apa":"Maalouly, J., Hemker, D., Hedayat, C., Rückert, C., Kaufmann, I., Olbrich, M., Lange, S., & Mathis, H. (2022). AI Assisted Interference Classification to Improve EMC Troubleshooting in Electronic System Development. 2022 Kleinheubach Conference. 2022 Kleinheubach Conference, Miltenberg, Germany.","ieee":"J. Maalouly et al., “AI Assisted Interference Classification to Improve EMC Troubleshooting in Electronic System Development,” presented at the 2022 Kleinheubach Conference, Miltenberg, Germany, 2022."},"place":"Miltenberg, Germany","status":"public","conference":{"location":"Miltenberg, Germany","start_date":"2022-09-27","name":"2022 Kleinheubach Conference","end_date":"2022-09-29"},"user_id":"38240","publisher":"IEEE","_id":"34140"}]