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(2021). Integration fachwissenschaftlicher und fachdidaktischer Komponenten in der Lehramtsausbildung Mathematik Grundschule am Beispiel einer Veranstaltung zur Leitidee „Daten, Häufigkeit und Wahrscheinlichkeit“. In <i>Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik</i>. Springer Berlin Heidelberg. <a href=\"https://doi.org/10.1007/978-3-662-62854-6_11\">https://doi.org/10.1007/978-3-662-62854-6_11</a>","ieee":"D. Frischemeier, S. Podworny, and R. Biehler, “Integration fachwissenschaftlicher und fachdidaktischer Komponenten in der Lehramtsausbildung Mathematik Grundschule am Beispiel einer Veranstaltung zur Leitidee „Daten, Häufigkeit und Wahrscheinlichkeit“,” in <i>Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik</i>, Berlin, Heidelberg: Springer Berlin Heidelberg, 2021.","short":"D. Frischemeier, S. Podworny, R. Biehler, in: Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik, Springer Berlin Heidelberg, Berlin, Heidelberg, 2021.","chicago":"Frischemeier, Daniel, Susanne Podworny, and Rolf Biehler. “Integration fachwissenschaftlicher und fachdidaktischer Komponenten in der Lehramtsausbildung Mathematik Grundschule am Beispiel einer Veranstaltung zur Leitidee „Daten, Häufigkeit und Wahrscheinlichkeit“.” In <i>Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik</i>. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. <a href=\"https://doi.org/10.1007/978-3-662-62854-6_11\">https://doi.org/10.1007/978-3-662-62854-6_11</a>.","mla":"Frischemeier, Daniel, et al. “Integration fachwissenschaftlicher und fachdidaktischer Komponenten in der Lehramtsausbildung Mathematik Grundschule am Beispiel einer Veranstaltung zur Leitidee „Daten, Häufigkeit und Wahrscheinlichkeit“.” <i>Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik</i>, Springer Berlin Heidelberg, 2021, doi:<a href=\"https://doi.org/10.1007/978-3-662-62854-6_11\">10.1007/978-3-662-62854-6_11</a>.","ama":"Frischemeier D, Podworny S, Biehler R. Integration fachwissenschaftlicher und fachdidaktischer Komponenten in der Lehramtsausbildung Mathematik Grundschule am Beispiel einer Veranstaltung zur Leitidee „Daten, Häufigkeit und Wahrscheinlichkeit“. In: <i>Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik</i>. Springer Berlin Heidelberg; 2021. doi:<a href=\"https://doi.org/10.1007/978-3-662-62854-6_11\">10.1007/978-3-662-62854-6_11</a>","bibtex":"@inbook{Frischemeier_Podworny_Biehler_2021, place={Berlin, Heidelberg}, title={Integration fachwissenschaftlicher und fachdidaktischer Komponenten in der Lehramtsausbildung Mathematik Grundschule am Beispiel einer Veranstaltung zur Leitidee „Daten, Häufigkeit und Wahrscheinlichkeit“}, DOI={<a href=\"https://doi.org/10.1007/978-3-662-62854-6_11\">10.1007/978-3-662-62854-6_11</a>}, booktitle={Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik}, publisher={Springer Berlin Heidelberg}, author={Frischemeier, Daniel and Podworny, Susanne and Biehler, Rolf}, year={2021} }"},"publication":"Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik","place":"Berlin, Heidelberg","date_created":"2024-09-23T09:01:18Z","department":[{"_id":"363"}],"type":"book_chapter"},{"type":"dissertation","department":[{"_id":"10"},{"_id":"87"},{"_id":"93"}],"oa":"1","date_created":"2026-02-26T21:15:13Z","citation":{"chicago":"Nikitin, Natalie. <i>Regularity Properties of Infinite-Dimensional Lie Groups and Exponential Laws</i>, 2021.","short":"N. Nikitin, Regularity Properties of Infinite-Dimensional Lie Groups and Exponential Laws, 2021.","apa":"Nikitin, N. (2021). <i>Regularity properties of infinite-dimensional Lie groups and exponential laws</i>.","ieee":"N. Nikitin, <i>Regularity properties of infinite-dimensional Lie groups and exponential laws</i>. 2021.","ama":"Nikitin N. <i>Regularity Properties of Infinite-Dimensional Lie Groups and Exponential Laws</i>.; 2021.","bibtex":"@book{Nikitin_2021, title={Regularity properties of infinite-dimensional Lie groups and exponential laws}, author={Nikitin, Natalie}, year={2021} }","mla":"Nikitin, Natalie. <i>Regularity Properties of Infinite-Dimensional Lie Groups and Exponential Laws</i>. 2021."},"supervisor":[{"id":"178","first_name":"Helge","last_name":"Glöckner","full_name":"Glöckner, Helge"}],"user_id":"178","main_file_link":[{"url":"https://nbn-resolving.org/urn:nbn:de:hbz:466:2-39133","open_access":"1"}],"language":[{"iso":"eng"}],"_id":"64765","date_updated":"2026-02-26T21:15:28Z","status":"public","title":"Regularity properties of infinite-dimensional Lie groups and exponential laws","year":"2021","author":[{"full_name":"Nikitin, Natalie","first_name":"Natalie","last_name":"Nikitin"}]},{"status":"public","user_id":"178","volume":781,"page":"85–103","_id":"34790","quality_controlled":"1","citation":{"mla":"Glöckner, Helge, and George A. Willis. “Locally Pro-p Contraction Groups Are Nilpotent.” <i>Journal Für Die Reine Und Angewandte Mathematik</i>, vol. 781, 2021, pp. 85–103, doi:<a href=\"https://doi.org/10.1515/crelle-2021-0050\">10.1515/crelle-2021-0050</a>.","apa":"Glöckner, H., &#38; Willis, G. A. (2021). Locally pro-p contraction groups are nilpotent. <i>Journal Für Die Reine Und Angewandte Mathematik</i>, <i>781</i>, 85–103. <a href=\"https://doi.org/10.1515/crelle-2021-0050\">https://doi.org/10.1515/crelle-2021-0050</a>","ieee":"H. Glöckner and G. A. Willis, “Locally pro-p contraction groups are nilpotent,” <i>Journal für die reine und angewandte Mathematik</i>, vol. 781, pp. 85–103, 2021, doi: <a href=\"https://doi.org/10.1515/crelle-2021-0050\">10.1515/crelle-2021-0050</a>.","short":"H. Glöckner, G.A. Willis, Journal Für Die Reine Und Angewandte Mathematik 781 (2021) 85–103.","ama":"Glöckner H, Willis GA. Locally pro-p contraction groups are nilpotent. <i>Journal für die reine und angewandte Mathematik</i>. 2021;781:85–103. doi:<a href=\"https://doi.org/10.1515/crelle-2021-0050\">10.1515/crelle-2021-0050</a>","chicago":"Glöckner, Helge, and George A. Willis. “Locally Pro-p Contraction Groups Are Nilpotent.” <i>Journal Für Die Reine Und Angewandte Mathematik</i> 781 (2021): 85–103. <a href=\"https://doi.org/10.1515/crelle-2021-0050\">https://doi.org/10.1515/crelle-2021-0050</a>.","bibtex":"@article{Glöckner_Willis_2021, title={Locally pro-p contraction groups are nilpotent}, volume={781}, DOI={<a href=\"https://doi.org/10.1515/crelle-2021-0050\">10.1515/crelle-2021-0050</a>}, journal={Journal für die reine und angewandte Mathematik}, author={Glöckner, Helge and Willis, George A.}, year={2021}, pages={85–103} }"},"date_updated":"2026-02-27T08:34:58Z","intvolume":"       781","article_type":"original","year":"2021","title":"Locally pro-p contraction groups are nilpotent","publication_identifier":{"issn":["0075-4102"]},"author":[{"id":"178","last_name":"Glöckner","first_name":"Helge","full_name":"Glöckner, Helge"},{"full_name":"Willis, George A.","last_name":"Willis","first_name":"George A."}],"doi":"10.1515/crelle-2021-0050","language":[{"iso":"eng"}],"publication":"Journal für die reine und angewandte Mathematik","type":"journal_article","keyword":["22D05","22A05","20E18"],"department":[{"_id":"10"},{"_id":"87"},{"_id":"93"}],"date_created":"2022-12-21T19:17:28Z"},{"citation":{"ieee":"R. I. McLachlan and C. Offen, “Preservation of Bifurcations of Hamiltonian Boundary Value Problems Under Discretisation,” <i>Foundations of Computational Mathematics</i>, vol. 20, no. 6, pp. 1363–1400, 2020.","apa":"McLachlan, R. I., &#38; Offen, C. (2020). Preservation of Bifurcations of Hamiltonian Boundary Value Problems Under Discretisation. <i>Foundations of Computational Mathematics</i>, <i>20</i>(6), 1363–1400. <a href=\"https://doi.org/10.1007/s10208-020-09454-z\">https://doi.org/10.1007/s10208-020-09454-z</a>","chicago":"McLachlan, Robert I, and Christian Offen. “Preservation of Bifurcations of Hamiltonian Boundary Value Problems Under Discretisation.” <i>Foundations of Computational Mathematics</i> 20, no. 6 (2020): 1363–1400. <a href=\"https://doi.org/10.1007/s10208-020-09454-z\">https://doi.org/10.1007/s10208-020-09454-z</a>.","short":"R.I. McLachlan, C. Offen, Foundations of Computational Mathematics 20 (2020) 1363–1400.","mla":"McLachlan, Robert I., and Christian Offen. “Preservation of Bifurcations of Hamiltonian Boundary Value Problems Under Discretisation.” <i>Foundations of Computational Mathematics</i>, vol. 20, no. 6, 2020, pp. 1363–400, doi:<a href=\"https://doi.org/10.1007/s10208-020-09454-z\">10.1007/s10208-020-09454-z</a>.","bibtex":"@article{McLachlan_Offen_2020, title={Preservation of Bifurcations of Hamiltonian Boundary Value Problems Under Discretisation}, volume={20}, DOI={<a href=\"https://doi.org/10.1007/s10208-020-09454-z\">10.1007/s10208-020-09454-z</a>}, number={6}, journal={Foundations of Computational Mathematics}, author={McLachlan, Robert I and Offen, Christian}, year={2020}, pages={1363–1400} }","ama":"McLachlan RI, Offen C. Preservation of Bifurcations of Hamiltonian Boundary Value Problems Under Discretisation. <i>Foundations of Computational Mathematics</i>. 2020;20(6):1363-1400. doi:<a href=\"https://doi.org/10.1007/s10208-020-09454-z\">10.1007/s10208-020-09454-z</a>"},"user_id":"85279","volume":20,"page":"1363-1400","_id":"19938","status":"public","type":"journal_article","department":[{"_id":"636"}],"date_created":"2020-10-06T16:31:46Z","extern":"1","abstract":[{"text":"We show that symplectic integrators preserve bifurcations of Hamiltonian boundary value problems and that nonsymplectic integrators do not. We provide a universal description of the breaking of umbilic bifurcations by nonysmplectic integrators. We discover extra structure induced from certain types of boundary value problems, including classical Dirichlet problems, that is useful to locate bifurcations. Geodesics connecting two points are an example of a Hamiltonian boundary value problem, and we introduce the jet-RATTLE method, a symplectic integrator that easily computes geodesics and their bifurcations. Finally, we study the periodic pitchfork bifurcation, a codimension-1 bifurcation arising in integrable Hamiltonian systems. It is not preserved by either symplectic on nonsymplectic integrators, but in some circumstances symplecticity greatly reduces the error. 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Detection of high codimensional bifurcations in variational PDEs. <i>Nonlinearity</i>. 2020;33(5):2335-2363. doi:<a href=\"https://doi.org/10.1088/1361-6544/ab7293\">10.1088/1361-6544/ab7293</a>","ieee":"L. M. Kreusser, R. I. McLachlan, and C. Offen, “Detection of high codimensional bifurcations in variational PDEs,” <i>Nonlinearity</i>, vol. 33, no. 5, pp. 2335–2363, 2020.","apa":"Kreusser, L. M., McLachlan, R. I., &#38; Offen, C. (2020). Detection of high codimensional bifurcations in variational PDEs. <i>Nonlinearity</i>, <i>33</i>(5), 2335–2363. <a href=\"https://doi.org/10.1088/1361-6544/ab7293\">https://doi.org/10.1088/1361-6544/ab7293</a>","short":"L.M. Kreusser, R.I. McLachlan, C. Offen, Nonlinearity 33 (2020) 2335–2363.","chicago":"Kreusser, Lisa Maria, Robert I McLachlan, and Christian Offen. “Detection of High Codimensional Bifurcations in Variational PDEs.” <i>Nonlinearity</i> 33, no. 5 (2020): 2335–63. <a href=\"https://doi.org/10.1088/1361-6544/ab7293\">https://doi.org/10.1088/1361-6544/ab7293</a>."},"oa":"1"},{"citation":{"apa":"Flaßkamp, K., Ober-Blöbaum, S., &#38; Peitz, S. (2020). Symmetry in Optimal Control: A Multiobjective Model Predictive Control Approach. In O. Junge, O. Schütze, G. Froyland, S. Ober-Blöbaum, &#38; K. Padberg-Gehle (Eds.), <i>Advances in Dynamics, Optimization and Computation</i>. Cham: Springer. <a href=\"https://doi.org/10.1007/978-3-030-51264-4_9\">https://doi.org/10.1007/978-3-030-51264-4_9</a>","ieee":"K. Flaßkamp, S. Ober-Blöbaum, and S. Peitz, “Symmetry in Optimal Control: A Multiobjective Model Predictive Control Approach,” in <i>Advances in Dynamics, Optimization and Computation</i>, O. Junge, O. Schütze, G. Froyland, S. Ober-Blöbaum, and K. Padberg-Gehle, Eds. Cham: Springer, 2020.","chicago":"Flaßkamp, Kathrin, Sina Ober-Blöbaum, and Sebastian Peitz. “Symmetry in Optimal Control: A Multiobjective Model Predictive Control Approach.” In <i>Advances in Dynamics, Optimization and Computation</i>, edited by Oliver Junge, Oliver Schütze, Gary Froyland, Sina Ober-Blöbaum, and Kathrin Padberg-Gehle. Cham: Springer, 2020. <a href=\"https://doi.org/10.1007/978-3-030-51264-4_9\">https://doi.org/10.1007/978-3-030-51264-4_9</a>.","short":"K. Flaßkamp, S. Ober-Blöbaum, S. Peitz, in: O. Junge, O. Schütze, G. Froyland, S. Ober-Blöbaum, K. Padberg-Gehle (Eds.), Advances in Dynamics, Optimization and Computation, Springer, Cham, 2020.","mla":"Flaßkamp, Kathrin, et al. “Symmetry in Optimal Control: A Multiobjective Model Predictive Control Approach.” <i>Advances in Dynamics, Optimization and Computation</i>, edited by Oliver Junge et al., Springer, 2020, doi:<a href=\"https://doi.org/10.1007/978-3-030-51264-4_9\">10.1007/978-3-030-51264-4_9</a>.","ama":"Flaßkamp K, Ober-Blöbaum S, Peitz S. Symmetry in Optimal Control: A Multiobjective Model Predictive Control Approach. In: Junge O, Schütze O, Froyland G, Ober-Blöbaum S, Padberg-Gehle K, eds. <i>Advances in Dynamics, Optimization and Computation</i>. Cham: Springer; 2020. doi:<a href=\"https://doi.org/10.1007/978-3-030-51264-4_9\">10.1007/978-3-030-51264-4_9</a>","bibtex":"@inbook{Flaßkamp_Ober-Blöbaum_Peitz_2020, place={Cham}, title={Symmetry in Optimal Control: A Multiobjective Model Predictive Control Approach}, DOI={<a href=\"https://doi.org/10.1007/978-3-030-51264-4_9\">10.1007/978-3-030-51264-4_9</a>}, booktitle={Advances in Dynamics, Optimization and Computation}, publisher={Springer}, author={Flaßkamp, Kathrin and Ober-Blöbaum, Sina and Peitz, Sebastian}, editor={Junge, Oliver and Schütze, Oliver and Froyland, Gary and Ober-Blöbaum, Sina and Padberg-Gehle, KathrinEditors}, year={2020} }"},"publication":"Advances in Dynamics, Optimization and Computation","abstract":[{"lang":"eng","text":"Many dynamical systems possess symmetries, e.g. rotational and translational invariances of mechanical systems. These can be beneficially exploited in the design of numerical optimal control methods. We present a model predictive control scheme which is based on a library of precomputed motion primitives. The primitives are equivalence classes w.r.t. the symmetry of the optimal control problems. Trim primitives as relative equilibria w.r.t. this symmetry, play a crucial role in the algorithm. The approach is illustrated using an academic mobile robot example."}],"date_created":"2020-07-27T09:50:19Z","place":"Cham","department":[{"_id":"101"}],"type":"book_chapter","publication_identifier":{"isbn":["9783030512637","9783030512644"],"issn":["2198-4182","2198-4190"]},"author":[{"first_name":"Kathrin","last_name":"Flaßkamp","full_name":"Flaßkamp, Kathrin"},{"full_name":"Ober-Blöbaum, Sina","first_name":"Sina","last_name":"Ober-Blöbaum"},{"id":"47427","full_name":"Peitz, Sebastian","first_name":"Sebastian","orcid":"0000-0002-3389-793X","last_name":"Peitz"}],"year":"2020","title":"Symmetry in Optimal Control: A Multiobjective Model Predictive Control Approach","status":"public","publication_status":"published","date_updated":"2022-01-06T06:53:11Z","_id":"17411","language":[{"iso":"eng"}],"publisher":"Springer","editor":[{"first_name":"Oliver","last_name":"Junge","full_name":"Junge, Oliver"},{"first_name":"Oliver","last_name":"Schütze","full_name":"Schütze, Oliver"},{"first_name":"Gary","last_name":"Froyland","full_name":"Froyland, Gary"},{"full_name":"Ober-Blöbaum, Sina","last_name":"Ober-Blöbaum","first_name":"Sina"},{"full_name":"Padberg-Gehle, Kathrin","first_name":"Kathrin","last_name":"Padberg-Gehle"}],"user_id":"47427","doi":"10.1007/978-3-030-51264-4_9"},{"publication":"Entropy","citation":{"mla":"Klus, Stefan, et al. “Kernel-Based Approximation of the Koopman Generator and Schrödinger Operator.” <i>Entropy</i>, 722, 2020, doi:<a href=\"https://doi.org/10.3390/e22070722\">10.3390/e22070722</a>.","bibtex":"@article{Klus_Nüske_Hamzi_2020, title={Kernel-Based Approximation of the Koopman Generator and Schrödinger Operator}, DOI={<a href=\"https://doi.org/10.3390/e22070722\">10.3390/e22070722</a>}, number={722}, journal={Entropy}, author={Klus, Stefan and Nüske, Feliks and Hamzi, Boumediene}, year={2020} }","ama":"Klus S, Nüske F, Hamzi B. Kernel-Based Approximation of the Koopman Generator and Schrödinger Operator. <i>Entropy</i>. 2020. doi:<a href=\"https://doi.org/10.3390/e22070722\">10.3390/e22070722</a>","ieee":"S. Klus, F. Nüske, and B. Hamzi, “Kernel-Based Approximation of the Koopman Generator and Schrödinger Operator,” <i>Entropy</i>, 2020.","apa":"Klus, S., Nüske, F., &#38; Hamzi, B. (2020). Kernel-Based Approximation of the Koopman Generator and Schrödinger Operator. <i>Entropy</i>. <a href=\"https://doi.org/10.3390/e22070722\">https://doi.org/10.3390/e22070722</a>","short":"S. Klus, F. Nüske, B. Hamzi, Entropy (2020).","chicago":"Klus, Stefan, Feliks Nüske, and Boumediene Hamzi. “Kernel-Based Approximation of the Koopman Generator and Schrödinger Operator.” <i>Entropy</i>, 2020. <a href=\"https://doi.org/10.3390/e22070722\">https://doi.org/10.3390/e22070722</a>."},"abstract":[{"lang":"eng","text":"<jats:p>Many dimensionality and model reduction techniques rely on estimating dominant eigenfunctions of associated dynamical operators from data. Important examples include the Koopman operator and its generator, but also the Schrödinger operator. We propose a kernel-based method for the approximation of differential operators in reproducing kernel Hilbert spaces and show how eigenfunctions can be estimated by solving auxiliary matrix eigenvalue problems. The resulting algorithms are applied to molecular dynamics and quantum chemistry examples. Furthermore, we exploit that, under certain conditions, the Schrödinger operator can be transformed into a Kolmogorov backward operator corresponding to a drift-diffusion process and vice versa. This allows us to apply methods developed for the analysis of high-dimensional stochastic differential equations to quantum mechanical systems.</jats:p>"}],"date_created":"2021-04-28T18:06:35Z","type":"journal_article","oa":"1","department":[{"_id":"101"}],"year":"2020","title":"Kernel-Based Approximation of the Koopman Generator and Schrödinger Operator","status":"public","author":[{"full_name":"Klus, Stefan","first_name":"Stefan","last_name":"Klus"},{"last_name":"Nüske","first_name":"Feliks","orcid":"0000-0003-2444-7889","full_name":"Nüske, Feliks","id":"81513"},{"last_name":"Hamzi","first_name":"Boumediene","full_name":"Hamzi, Boumediene"}],"publication_identifier":{"issn":["1099-4300"]},"date_updated":"2022-01-06T06:55:16Z","publication_status":"published","main_file_link":[{"url":"https://www.mdpi.com/1099-4300/22/7/722","open_access":"1"}],"article_number":"722","language":[{"iso":"eng"}],"_id":"21819","doi":"10.3390/e22070722","user_id":"81513"},{"page":"117-138","_id":"16964","user_id":"30933","volume":95,"title":"Das Kompetenzzentrum Hochschuldidaktik Mathematik (khdm)","status":"public","year":"2020","author":[{"last_name":"Hochmuth","first_name":"Reinhard","full_name":"Hochmuth, Reinhard"},{"last_name":"Liebendörfer","first_name":"Michael","full_name":"Liebendörfer, Michael"},{"full_name":"Biehler, Rolf","first_name":"Rolf","last_name":"Biehler"},{"full_name":"Eichler, Andreas","last_name":"Eichler","first_name":"Andreas"}],"date_updated":"2022-01-06T06:53:00Z","intvolume":"        95","date_created":"2020-05-16T07:32:23Z","type":"journal_article","department":[{"_id":"10"}],"publication":"Neues Handbuch Hochschullehre","citation":{"ama":"Hochmuth R, Liebendörfer M, Biehler R, Eichler A. Das Kompetenzzentrum Hochschuldidaktik Mathematik (khdm). <i>Neues Handbuch Hochschullehre</i>. 2020;95:117-138.","bibtex":"@article{Hochmuth_Liebendörfer_Biehler_Eichler_2020, title={Das Kompetenzzentrum Hochschuldidaktik Mathematik (khdm)}, volume={95}, journal={Neues Handbuch Hochschullehre}, author={Hochmuth, Reinhard and Liebendörfer, Michael and Biehler, Rolf and Eichler, Andreas}, year={2020}, pages={117–138} }","mla":"Hochmuth, Reinhard, et al. “Das Kompetenzzentrum Hochschuldidaktik Mathematik (Khdm).” <i>Neues Handbuch Hochschullehre</i>, vol. 95, 2020, pp. 117–38.","chicago":"Hochmuth, Reinhard, Michael Liebendörfer, Rolf Biehler, and Andreas Eichler. “Das Kompetenzzentrum Hochschuldidaktik Mathematik (Khdm).” <i>Neues Handbuch Hochschullehre</i> 95 (2020): 117–38.","short":"R. Hochmuth, M. Liebendörfer, R. Biehler, A. Eichler, Neues Handbuch Hochschullehre 95 (2020) 117–138.","apa":"Hochmuth, R., Liebendörfer, M., Biehler, R., &#38; Eichler, A. (2020). Das Kompetenzzentrum Hochschuldidaktik Mathematik (khdm). <i>Neues Handbuch Hochschullehre</i>, <i>95</i>, 117–138.","ieee":"R. Hochmuth, M. Liebendörfer, R. Biehler, and A. Eichler, “Das Kompetenzzentrum Hochschuldidaktik Mathematik (khdm),” <i>Neues Handbuch Hochschullehre</i>, vol. 95, pp. 117–138, 2020."}},{"citation":{"ama":"Schütze O, Cuate O, Martín A, Peitz S, Dellnitz M. Pareto Explorer: a global/local exploration tool for many-objective optimization problems. <i>Engineering Optimization</i>. 2020;52(5):832-855. doi:<a href=\"https://doi.org/10.1080/0305215x.2019.1617286\">10.1080/0305215x.2019.1617286</a>","bibtex":"@article{Schütze_Cuate_Martín_Peitz_Dellnitz_2020, title={Pareto Explorer: a global/local exploration tool for many-objective optimization problems}, volume={52}, DOI={<a href=\"https://doi.org/10.1080/0305215x.2019.1617286\">10.1080/0305215x.2019.1617286</a>}, number={5}, journal={Engineering Optimization}, author={Schütze, Oliver and Cuate, Oliver and Martín, Adanay and Peitz, Sebastian and Dellnitz, Michael}, year={2020}, pages={832–855} }","mla":"Schütze, Oliver, et al. “Pareto Explorer: A Global/Local Exploration Tool for Many-Objective Optimization Problems.” <i>Engineering Optimization</i>, vol. 52, no. 5, 2020, pp. 832–55, doi:<a href=\"https://doi.org/10.1080/0305215x.2019.1617286\">10.1080/0305215x.2019.1617286</a>.","chicago":"Schütze, Oliver, Oliver Cuate, Adanay Martín, Sebastian Peitz, and Michael Dellnitz. “Pareto Explorer: A Global/Local Exploration Tool for Many-Objective Optimization Problems.” <i>Engineering Optimization</i> 52, no. 5 (2020): 832–55. <a href=\"https://doi.org/10.1080/0305215x.2019.1617286\">https://doi.org/10.1080/0305215x.2019.1617286</a>.","short":"O. Schütze, O. Cuate, A. Martín, S. Peitz, M. Dellnitz, Engineering Optimization 52 (2020) 832–855.","apa":"Schütze, O., Cuate, O., Martín, A., Peitz, S., &#38; Dellnitz, M. (2020). Pareto Explorer: a global/local exploration tool for many-objective optimization problems. <i>Engineering Optimization</i>, <i>52</i>(5), 832–855. <a href=\"https://doi.org/10.1080/0305215x.2019.1617286\">https://doi.org/10.1080/0305215x.2019.1617286</a>","ieee":"O. Schütze, O. Cuate, A. Martín, S. Peitz, and M. Dellnitz, “Pareto Explorer: a global/local exploration tool for many-objective optimization problems,” <i>Engineering Optimization</i>, vol. 52, no. 5, pp. 832–855, 2020."},"user_id":"47427","volume":52,"page":"832-855","_id":"10596","status":"public","type":"journal_article","department":[{"_id":"101"}],"date_created":"2019-07-10T08:14:39Z","abstract":[{"text":"Multi-objective optimization is an active field of research that has many applications. Owing to its success and because decision-making processes are becoming more and more complex, there is a recent trend for incorporating many objectives into such problems. The challenge with such problems, however, is that the dimensions of the solution sets—the so-called Pareto sets and fronts—grow with the number of objectives. It is thus no longer possible to compute or to approximate the entire solution set of a given problem that contains many (e.g. more than three) objectives. On the other hand, the computation of single solutions (e.g. via scalarization methods) leads to unsatisfying results in many cases, even if user preferences are incorporated. In this article, the Pareto Explorer tool is presented—a global/local exploration tool for the treatment of many-objective optimization problems (MaOPs). In the first step, a solution of the problem is computed via a global search algorithm that ideally already includes user preferences. In the second step, a local search along the Pareto set/front of the given MaOP is performed in user specified directions. For this, several continuation-like procedures are proposed that can incorporate preferences defined in decision, objective, or in weight space. The applicability and usefulness of Pareto Explorer is demonstrated on benchmark problems as well as on an application from industrial laundry design.","lang":"eng"}],"issue":"5","publication":"Engineering Optimization","doi":"10.1080/0305215x.2019.1617286","language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2022-01-06T06:50:46Z","article_type":"original","intvolume":"        52","title":"Pareto Explorer: a global/local exploration tool for many-objective optimization problems","year":"2020","author":[{"first_name":"Oliver","last_name":"Schütze","full_name":"Schütze, Oliver"},{"full_name":"Cuate, Oliver","first_name":"Oliver","last_name":"Cuate"},{"first_name":"Adanay","last_name":"Martín","full_name":"Martín, Adanay"},{"id":"47427","first_name":"Sebastian","last_name":"Peitz","orcid":"https://orcid.org/0000-0002-3389-793X","full_name":"Peitz, Sebastian"},{"full_name":"Dellnitz, Michael","last_name":"Dellnitz","first_name":"Michael"}],"publication_identifier":{"issn":["0305-215X","1029-0273"]}},{"date_created":"2020-03-13T12:35:40Z","type":"journal_article","department":[{"_id":"101"}],"publication":"Physica D: Nonlinear Phenomena","citation":{"mla":"Klus, Stefan, et al. “Data-Driven Approximation of the Koopman Generator: Model Reduction, System Identification, and Control.” <i>Physica D: Nonlinear Phenomena</i>, vol. 406, 132416, 2020, doi:<a href=\"https://doi.org/10.1016/j.physd.2020.132416\">10.1016/j.physd.2020.132416</a>.","ama":"Klus S, Nüske F, Peitz S, Niemann J-H, Clementi C, Schütte C. Data-driven approximation of the Koopman generator: Model reduction, system identification, and control. <i>Physica D: Nonlinear Phenomena</i>. 2020;406. doi:<a href=\"https://doi.org/10.1016/j.physd.2020.132416\">10.1016/j.physd.2020.132416</a>","bibtex":"@article{Klus_Nüske_Peitz_Niemann_Clementi_Schütte_2020, title={Data-driven approximation of the Koopman generator: Model reduction, system identification, and control}, volume={406}, DOI={<a href=\"https://doi.org/10.1016/j.physd.2020.132416\">10.1016/j.physd.2020.132416</a>}, number={132416}, journal={Physica D: Nonlinear Phenomena}, author={Klus, Stefan and Nüske, Feliks and Peitz, Sebastian and Niemann, Jan-Hendrik and Clementi, Cecilia and Schütte, Christof}, year={2020} }","apa":"Klus, S., Nüske, F., Peitz, S., Niemann, J.-H., Clementi, C., &#38; Schütte, C. (2020). Data-driven approximation of the Koopman generator: Model reduction, system identification, and control. <i>Physica D: Nonlinear Phenomena</i>, <i>406</i>. <a href=\"https://doi.org/10.1016/j.physd.2020.132416\">https://doi.org/10.1016/j.physd.2020.132416</a>","ieee":"S. Klus, F. Nüske, S. Peitz, J.-H. Niemann, C. Clementi, and C. Schütte, “Data-driven approximation of the Koopman generator: Model reduction, system identification, and control,” <i>Physica D: Nonlinear Phenomena</i>, vol. 406, 2020.","short":"S. Klus, F. Nüske, S. Peitz, J.-H. Niemann, C. Clementi, C. Schütte, Physica D: Nonlinear Phenomena 406 (2020).","chicago":"Klus, Stefan, Feliks Nüske, Sebastian Peitz, Jan-Hendrik Niemann, Cecilia Clementi, and Christof Schütte. “Data-Driven Approximation of the Koopman Generator: Model Reduction, System Identification, and Control.” <i>Physica D: Nonlinear Phenomena</i> 406 (2020). <a href=\"https://doi.org/10.1016/j.physd.2020.132416\">https://doi.org/10.1016/j.physd.2020.132416</a>."},"abstract":[{"lang":"eng","text":"We derive a data-driven method for the approximation of the Koopman generator called gEDMD, which can be regarded as a straightforward extension of EDMD (extended dynamic mode decomposition). This approach is applicable to deterministic and stochastic dynamical systems. It can be used for computing eigenvalues, eigenfunctions, and modes of the generator and for system identification. In addition to learning the governing equations of deterministic systems, which then reduces to SINDy (sparse identification of nonlinear dynamics), it is possible to identify the drift and diffusion terms of stochastic differential equations from data. Moreover, we apply gEDMD to derive coarse-grained models of high-dimensional systems, and also to determine efficient model predictive control strategies. We highlight relationships with other methods and demonstrate the efficacy of the proposed methods using several guiding examples and prototypical molecular dynamics problems."}],"article_number":"132416","_id":"16288","language":[{"iso":"eng"}],"doi":"10.1016/j.physd.2020.132416","user_id":"47427","volume":406,"year":"2020","status":"public","title":"Data-driven approximation of the Koopman generator: Model reduction, system identification, and control","author":[{"full_name":"Klus, Stefan","last_name":"Klus","first_name":"Stefan"},{"id":"81513","first_name":"Feliks","last_name":"Nüske","orcid":"0000-0003-2444-7889","full_name":"Nüske, Feliks"},{"id":"47427","full_name":"Peitz, Sebastian","first_name":"Sebastian","orcid":"https://orcid.org/0000-0002-3389-793X","last_name":"Peitz"},{"full_name":"Niemann, Jan-Hendrik","last_name":"Niemann","first_name":"Jan-Hendrik"},{"full_name":"Clementi, Cecilia","first_name":"Cecilia","last_name":"Clementi"},{"last_name":"Schütte","first_name":"Christof","full_name":"Schütte, Christof"}],"publication_identifier":{"issn":["0167-2789"]},"date_updated":"2022-01-06T06:52:48Z","publication_status":"published","intvolume":"       406"},{"publication_identifier":{"isbn":["9783030357122","9783030357139"],"issn":["0170-8643","1610-7411"]},"author":[{"first_name":"Sebastian","orcid":"https://orcid.org/0000-0002-3389-793X","last_name":"Peitz","full_name":"Peitz, Sebastian","id":"47427"},{"first_name":"Stefan","last_name":"Klus","full_name":"Klus, Stefan"}],"year":"2020","title":"Feedback Control of Nonlinear PDEs Using Data-Efficient Reduced Order Models Based on the Koopman Operator","intvolume":"       484","date_updated":"2022-01-06T06:52:48Z","publication_status":"published","series_title":"Lecture Notes in Control and Information Sciences","language":[{"iso":"eng"}],"doi":"10.1007/978-3-030-35713-9_10","publication":"Lecture Notes in Control and Information Sciences","abstract":[{"text":"In the development of model predictive controllers for PDE-constrained problems, the use of reduced order models is essential to enable real-time applicability. Besides local linearization approaches, proper orthogonal decomposition (POD) has been most widely used in the past in order to derive such models. Due to the huge advances concerning both theory as well as the numerical approximation, a very promising alternative based on the Koopman operator has recently emerged. In this chapter, we present two control strategies for model predictive control of nonlinear PDEs using data-efficient approximations of the Koopman operator. In the first one, the dynamic control system is replaced by a small number of autonomous systems with different yet constant inputs. The control problem is consequently transformed into a switching problem. In the second approach, a bilinear surrogate model is obtained via a convex combination of these autonomous systems. Using a recent convergence result for extended dynamic mode decomposition (EDMD), convergence of the reduced objective function can be shown. We study the properties of these two strategies with respect to solution quality, data requirements, and complexity of the resulting optimization problem using the 1-dimensional Burgers equation and the 2-dimensional Navier–Stokes equations as examples. Finally, an extension for online adaptivity is presented.","lang":"eng"}],"date_created":"2020-03-13T12:38:52Z","department":[{"_id":"101"}],"type":"book_chapter","status":"public","_id":"16289","publisher":"Springer","page":"257-282","volume":484,"user_id":"47427","citation":{"mla":"Peitz, Sebastian, and Stefan Klus. “Feedback Control of Nonlinear PDEs Using Data-Efficient Reduced Order Models Based on the Koopman Operator.” <i>Lecture Notes in Control and Information Sciences</i>, vol. 484, Springer, 2020, pp. 257–82, doi:<a href=\"https://doi.org/10.1007/978-3-030-35713-9_10\">10.1007/978-3-030-35713-9_10</a>.","bibtex":"@inbook{Peitz_Klus_2020, place={Cham}, series={Lecture Notes in Control and Information Sciences}, title={Feedback Control of Nonlinear PDEs Using Data-Efficient Reduced Order Models Based on the Koopman Operator}, volume={484}, DOI={<a href=\"https://doi.org/10.1007/978-3-030-35713-9_10\">10.1007/978-3-030-35713-9_10</a>}, booktitle={Lecture Notes in Control and Information Sciences}, publisher={Springer}, author={Peitz, Sebastian and Klus, Stefan}, year={2020}, pages={257–282}, collection={Lecture Notes in Control and Information Sciences} }","ama":"Peitz S, Klus S. Feedback Control of Nonlinear PDEs Using Data-Efficient Reduced Order Models Based on the Koopman Operator. In: <i>Lecture Notes in Control and Information Sciences</i>. Vol 484. Lecture Notes in Control and Information Sciences. Cham: Springer; 2020:257-282. doi:<a href=\"https://doi.org/10.1007/978-3-030-35713-9_10\">10.1007/978-3-030-35713-9_10</a>","ieee":"S. Peitz and S. Klus, “Feedback Control of Nonlinear PDEs Using Data-Efficient Reduced Order Models Based on the Koopman Operator,” in <i>Lecture Notes in Control and Information Sciences</i>, vol. 484, Cham: Springer, 2020, pp. 257–282.","apa":"Peitz, S., &#38; Klus, S. (2020). Feedback Control of Nonlinear PDEs Using Data-Efficient Reduced Order Models Based on the Koopman Operator. In <i>Lecture Notes in Control and Information Sciences</i> (Vol. 484, pp. 257–282). Cham: Springer. <a href=\"https://doi.org/10.1007/978-3-030-35713-9_10\">https://doi.org/10.1007/978-3-030-35713-9_10</a>","chicago":"Peitz, Sebastian, and Stefan Klus. “Feedback Control of Nonlinear PDEs Using Data-Efficient Reduced Order Models Based on the Koopman Operator.” In <i>Lecture Notes in Control and Information Sciences</i>, 484:257–82. Lecture Notes in Control and Information Sciences. Cham: Springer, 2020. <a href=\"https://doi.org/10.1007/978-3-030-35713-9_10\">https://doi.org/10.1007/978-3-030-35713-9_10</a>.","short":"S. Peitz, S. Klus, in: Lecture Notes in Control and Information Sciences, Springer, Cham, 2020, pp. 257–282."},"place":"Cham"},{"abstract":[{"text":"The control of complex systems is of critical importance in many branches of science, engineering, and industry, many of which are governed by nonlinear partial differential equations. Controlling an unsteady fluid flow is particularly important, as flow control is a key enabler for technologies in energy (e.g., wind, tidal, and combustion), transportation (e.g., planes, trains, and automobiles), security (e.g., tracking airborne contamination), and health (e.g., artificial hearts and artificial respiration). However, the high-dimensional, nonlinear, and multi-scale dynamics make real-time feedback control infeasible. Fortunately, these high- dimensional systems exhibit dominant, low-dimensional patterns of activity that can be exploited for effective control in the sense that knowledge of the entire state of a system is not required. Advances in machine learning have the potential to revolutionize flow control given its ability to extract principled, low-rank feature spaces characterizing such complex systems.We present a novel deep learning modelpredictive control framework that exploits low-rank features of the flow in order to achieve considerable improvements to control performance. Instead of predicting the entire fluid state, we use a recurrent neural network (RNN) to accurately predict the control relevant quantities of the system, which are then embedded into an MPC framework to construct a feedback loop. In order to lower the data requirements and to improve the prediction accuracy and thus the control performance, incoming sensor data are used to update the RNN online. The results are validated using varying fluid flow examples of increasing complexity.","lang":"eng"}],"publication":"Theoretical and Computational Fluid Dynamics","type":"journal_article","department":[{"_id":"101"}],"date_created":"2020-03-13T12:40:09Z","publication_status":"published","date_updated":"2022-01-06T06:52:48Z","article_type":"original","intvolume":"        34","title":"Deep model predictive flow control with limited sensor data and online learning","year":"2020","publication_identifier":{"issn":["0935-4964","1432-2250"]},"author":[{"last_name":"Bieker","first_name":"Katharina","full_name":"Bieker, Katharina","id":"32829"},{"id":"47427","last_name":"Peitz","first_name":"Sebastian","orcid":"https://orcid.org/0000-0002-3389-793X","full_name":"Peitz, Sebastian"},{"full_name":"Brunton, Steven L.","first_name":"Steven L.","last_name":"Brunton"},{"full_name":"Kutz, J. Nathan","last_name":"Kutz","first_name":"J. Nathan"},{"last_name":"Dellnitz","first_name":"Michael","full_name":"Dellnitz, Michael"}],"doi":"10.1007/s00162-020-00520-4","main_file_link":[{"url":"https://link.springer.com/content/pdf/10.1007/s00162-020-00520-4.pdf","open_access":"1"}],"language":[{"iso":"eng"}],"project":[{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"citation":{"short":"K. Bieker, S. Peitz, S.L. Brunton, J.N. Kutz, M. Dellnitz, Theoretical and Computational Fluid Dynamics 34 (2020) 577–591.","chicago":"Bieker, Katharina, Sebastian Peitz, Steven L. Brunton, J. Nathan Kutz, and Michael Dellnitz. “Deep Model Predictive Flow Control with Limited Sensor Data and Online Learning.” <i>Theoretical and Computational Fluid Dynamics</i> 34 (2020): 577–591. <a href=\"https://doi.org/10.1007/s00162-020-00520-4\">https://doi.org/10.1007/s00162-020-00520-4</a>.","apa":"Bieker, K., Peitz, S., Brunton, S. L., Kutz, J. N., &#38; Dellnitz, M. (2020). Deep model predictive flow control with limited sensor data and online learning. <i>Theoretical and Computational Fluid Dynamics</i>, <i>34</i>, 577–591. <a href=\"https://doi.org/10.1007/s00162-020-00520-4\">https://doi.org/10.1007/s00162-020-00520-4</a>","ieee":"K. Bieker, S. Peitz, S. L. Brunton, J. N. Kutz, and M. Dellnitz, “Deep model predictive flow control with limited sensor data and online learning,” <i>Theoretical and Computational Fluid Dynamics</i>, vol. 34, pp. 577–591, 2020.","ama":"Bieker K, Peitz S, Brunton SL, Kutz JN, Dellnitz M. Deep model predictive flow control with limited sensor data and online learning. <i>Theoretical and Computational Fluid Dynamics</i>. 2020;34:577–591. doi:<a href=\"https://doi.org/10.1007/s00162-020-00520-4\">10.1007/s00162-020-00520-4</a>","bibtex":"@article{Bieker_Peitz_Brunton_Kutz_Dellnitz_2020, title={Deep model predictive flow control with limited sensor data and online learning}, volume={34}, DOI={<a href=\"https://doi.org/10.1007/s00162-020-00520-4\">10.1007/s00162-020-00520-4</a>}, journal={Theoretical and Computational Fluid Dynamics}, author={Bieker, Katharina and Peitz, Sebastian and Brunton, Steven L. and Kutz, J. Nathan and Dellnitz, Michael}, year={2020}, pages={577–591} }","mla":"Bieker, Katharina, et al. “Deep Model Predictive Flow Control with Limited Sensor Data and Online Learning.” <i>Theoretical and Computational Fluid Dynamics</i>, vol. 34, 2020, pp. 577–591, doi:<a href=\"https://doi.org/10.1007/s00162-020-00520-4\">10.1007/s00162-020-00520-4</a>."},"oa":"1","status":"public","user_id":"47427","volume":34,"page":"577–591","_id":"16290"},{"page":"2162-2193","main_file_link":[{"url":"https://epubs.siam.org/doi/pdf/10.1137/20M1325678"}],"_id":"16309","language":[{"iso":"eng"}],"user_id":"47427","doi":"10.1137/20M1325678","volume":19,"title":"Data-Driven Model Predictive Control using Interpolated Koopman  Generators","year":"2020","status":"public","author":[{"id":"47427","orcid":"0000-0002-3389-793X","last_name":"Peitz","first_name":"Sebastian","full_name":"Peitz, Sebastian"},{"first_name":"Samuel E.","last_name":"Otto","full_name":"Otto, Samuel E."},{"first_name":"Clarence W.","last_name":"Rowley","full_name":"Rowley, Clarence W."}],"date_updated":"2022-01-06T06:52:48Z","intvolume":"        19","date_created":"2020-03-17T09:53:01Z","type":"journal_article","department":[{"_id":"101"}],"publication":"SIAM Journal on Applied Dynamical Systems","issue":"3","citation":{"ama":"Peitz S, Otto SE, Rowley CW. Data-Driven Model Predictive Control using Interpolated Koopman  Generators. <i>SIAM Journal on Applied Dynamical Systems</i>. 2020;19(3):2162-2193. doi:<a href=\"https://doi.org/10.1137/20M1325678\">10.1137/20M1325678</a>","bibtex":"@article{Peitz_Otto_Rowley_2020, title={Data-Driven Model Predictive Control using Interpolated Koopman  Generators}, volume={19}, DOI={<a href=\"https://doi.org/10.1137/20M1325678\">10.1137/20M1325678</a>}, number={3}, journal={SIAM Journal on Applied Dynamical Systems}, author={Peitz, Sebastian and Otto, Samuel E. and Rowley, Clarence W.}, year={2020}, pages={2162–2193} }","mla":"Peitz, Sebastian, et al. “Data-Driven Model Predictive Control Using Interpolated Koopman  Generators.” <i>SIAM Journal on Applied Dynamical Systems</i>, vol. 19, no. 3, 2020, pp. 2162–93, doi:<a href=\"https://doi.org/10.1137/20M1325678\">10.1137/20M1325678</a>.","short":"S. Peitz, S.E. Otto, C.W. Rowley, SIAM Journal on Applied Dynamical Systems 19 (2020) 2162–2193.","chicago":"Peitz, Sebastian, Samuel E. Otto, and Clarence W. Rowley. “Data-Driven Model Predictive Control Using Interpolated Koopman  Generators.” <i>SIAM Journal on Applied Dynamical Systems</i> 19, no. 3 (2020): 2162–93. <a href=\"https://doi.org/10.1137/20M1325678\">https://doi.org/10.1137/20M1325678</a>.","apa":"Peitz, S., Otto, S. E., &#38; Rowley, C. W. (2020). Data-Driven Model Predictive Control using Interpolated Koopman  Generators. <i>SIAM Journal on Applied Dynamical Systems</i>, <i>19</i>(3), 2162–2193. <a href=\"https://doi.org/10.1137/20M1325678\">https://doi.org/10.1137/20M1325678</a>","ieee":"S. Peitz, S. E. Otto, and C. W. Rowley, “Data-Driven Model Predictive Control using Interpolated Koopman  Generators,” <i>SIAM Journal on Applied Dynamical Systems</i>, vol. 19, no. 3, pp. 2162–2193, 2020."},"abstract":[{"text":"In recent years, the success of the Koopman operator in dynamical systems\r\nanalysis has also fueled the development of Koopman operator-based control\r\nframeworks. In order to preserve the relatively low data requirements for an\r\napproximation via Dynamic Mode Decomposition, a quantization approach was\r\nrecently proposed in [Peitz & Klus, Automatica 106, 2019]. This way, control\r\nof nonlinear dynamical systems can be realized by means of switched systems\r\ntechniques, using only a finite set of autonomous Koopman operator-based\r\nreduced models. These individual systems can be approximated very efficiently\r\nfrom data. The main idea is to transform a control system into a set of\r\nautonomous systems for which the optimal switching sequence has to be computed.\r\nIn this article, we extend these results to continuous control inputs using\r\nrelaxation. This way, we combine the advantages of the data efficiency of\r\napproximating a finite set of autonomous systems with continuous controls. We\r\nshow that when using the Koopman generator, this relaxation --- realized by\r\nlinear interpolation between two operators --- does not introduce any error for\r\ncontrol affine systems. This allows us to control high-dimensional nonlinear\r\nsystems using bilinear, low-dimensional surrogate models. The efficiency of the\r\nproposed approach is demonstrated using several examples with increasing\r\ncomplexity, from the Duffing oscillator to the chaotic fluidic pinball.","lang":"eng"}]}]