@inproceedings{29213,
  abstract     = {{This paper presents a technique to extend the frequency acquisition range for bang-bang phase-detector-based clock and data recovery (CDR) circuits without an additional frequency acquisition loop or lock detection circuit. The per-manent modulation of the offset current in the CDR's integral branch enhances the acquisition range by nearly 4 times, covering the entire tuning range of the voltage controlled oscillator. The increase in power dissipation and the chip area are negligible. This technique was implemented and measured in a 28 Gbps NRZ bang-bang CDR chip to confirm the working principle. In addition to the increased acquisition range, the CDR also surpasses jitter related specifications from the OIF CEI-28G-VSR standard.}},
  author       = {{Iftekhar, Mohammed and Gudyriev, Sergiy and Scheytt, J. Christoph}},
  booktitle    = {{The 2021 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium}},
  title        = {{{Reference-less Bang-bang CDR with Enhanced Frequency Acquisition Range Using Static and Modulated Integral Branch Offset Currents}}},
  doi          = {{10.1109/BCICTS50416.2021.9682207}},
  year         = {{2021}},
}

@inproceedings{25295,
  author       = {{Gurcke, Timon and Alshomary, Milad and Wachsmuth, Henning}},
  booktitle    = {{Proceedings of the 8th Workshop on Argument Mining}},
  pages        = {{67 -- 77}},
  title        = {{{Assessing the Sufficiency of Arguments through Conclusion Generation}}},
  year         = {{2021}},
}

@inproceedings{23709,
  author       = {{Chen, Wei-Fan and Al Khatib, Khalid and Stein, Benno and Wachsmuth, Henning}},
  booktitle    = {{Findings of the Association for Computational Linguistics: EMNLP 2021}},
  pages        = {{2683 -- 2693}},
  title        = {{{Controlled Neural Sentence-Level Reframing of News Articles}}},
  year         = {{2021}},
}

@inproceedings{22229,
  author       = {{Alshomary, Milad and Syed, Shahbaz and Potthast, Martin and Wachsmuth, Henning}},
  booktitle    = {{Proceedings of the Joint Conference of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing (ACL-IJCNLP 2021)}},
  location     = {{Online}},
  pages        = {{1816–1827}},
  publisher    = {{Association for Computational Linguistics}},
  title        = {{{Argument Undermining: Counter-Argument Generation by Attacking Weak Premises}}},
  doi          = {{10.18653/v1/2021.findings-acl.159}},
  year         = {{2021}},
}

@inproceedings{25880,
  author       = {{Hetkämper, Tim and Dreiling, Dmitrij and Claes, Leander and Henning, Bernd}},
  booktitle    = {{Fortschritte der Akustik - DAGA 2021}},
  title        = {{{Tomographie des Schallfelds von Ultraschallwandlern mittels Schlierentechnik}}},
  year         = {{2021}},
}

@unpublished{31058,
  abstract     = {{We consider a geodesic billiard system consisting of a complete Riemannian manifold and an obstacle submanifold with boundary at which the trajectories of the geodesic flow experience specular reflections. We show that if the geodesic billiard system is hyperbolic on its trapped set and the latter is compact and non-grazing the techniques for open hyperbolic systems developed by Dyatlov and Guillarmou can be applied to a smooth model for the discontinuous flow defined by the non-grazing billiard trajectories. This allows us to obtain a meromorphic resolvent for the generator of the billiard flow. As an application we prove a meromorphic continuation of weighted zeta functions together with explicit residue formulae. In particular, our results apply to scattering by convex obstacles in the Euclidean plane.}},
  author       = {{Schütte, Philipp and Weich, Tobias and Delarue, Benjamin}},
  title        = {{{Resonances and weighted zeta functions for obstacle scattering via smooth models}}},
  year         = {{2021}},
}

@misc{31385,
  author       = {{Hoffmann, Max}},
  booktitle    = {{Mathematische Semesterberichte}},
  pages        = {{295–297}},
  title        = {{{Rezension: Hendrik Kasten und Denis Vogel: Grundlagen der ebenen Geometrie – Eine zugängliche aber exakte Einführung in die ebene Geometrie}}},
  doi          = {{10.1007/s00591-021-00299-3}},
  volume       = {{68}},
  year         = {{2021}},
}

@inbook{31364,
  author       = {{Hoffmann, Max}},
  booktitle    = {{ Lehrinnovationen in der Hochschulmathematik.  praxisrelevant – didaktisch fundiert – forschungsbasiert}},
  editor       = {{Biehler, Rolf and Eichler, Andreas and Hochmuth, Reinhard and Rach, Stefanie and Schaper, Niclas}},
  isbn         = {{9783662628539}},
  issn         = {{2197-8751}},
  pages        = {{179–204}},
  publisher    = {{Springer Berlin Heidelberg}},
  title        = {{{Einsatz von Schnittstellenaufgaben in Mathematikveranstaltungen – Praxisbeispiele aus der Universität Paderborn}}},
  doi          = {{10.1007/978-3-662-62854-6_9}},
  year         = {{2021}},
}

@article{31261,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>For a compact Riemannian locally symmetric space $\mathcal M$ of rank 1 and an associated vector bundle $\mathbf V_{\tau }$ over the unit cosphere bundle $S^{\ast }\mathcal M$, we give a precise description of those classical (Pollicott–Ruelle) resonant states on $\mathbf V_{\tau }$ that vanish under covariant derivatives in the Anosov-unstable directions of the chaotic geodesic flow on $S^{\ast }\mathcal M$. In particular, we show that they are isomorphically mapped by natural pushforwards into generalized common eigenspaces of the algebra of invariant differential operators $D(G,\sigma )$ on compatible associated vector bundles $\mathbf W_{\sigma }$ over $\mathcal M$. As a consequence of this description, we obtain an exact band structure of the Pollicott–Ruelle spectrum. Further, under some mild assumptions on the representations $\tau$ and $\sigma$ defining the bundles $\mathbf V_{\tau }$ and $\mathbf W_{\sigma }$, we obtain a very explicit description of the generalized common eigenspaces. This allows us to relate classical Pollicott–Ruelle resonances to quantum eigenvalues of a Laplacian in a suitable Hilbert space of sections of $\mathbf W_{\sigma }$. Our methods of proof are based on representation theory and Lie theory.</jats:p>}},
  author       = {{Küster, Benjamin and Weich, Tobias}},
  issn         = {{1073-7928}},
  journal      = {{International Mathematics Research Notices}},
  keywords     = {{General Mathematics}},
  number       = {{11}},
  pages        = {{8225--8296}},
  publisher    = {{Oxford University Press (OUP)}},
  title        = {{{Quantum-Classical Correspondence on Associated Vector Bundles Over Locally Symmetric Spaces}}},
  doi          = {{10.1093/imrn/rnz068}},
  volume       = {{2021}},
  year         = {{2021}},
}

@article{31576,
  author       = {{Häsel-Weide, Uta and Nührenbürger, Marcus}},
  journal      = {{Zeitschrift für Grundschulforschung (ZfG)}},
  number       = {{14}},
  pages        = {{49--65}},
  publisher    = {{Springer}},
  title        = {{{Inklusive Praktiken im Mathematikunterricht. Empirische Analysen von Unterrichtsdiskursen in Einführungsphasen.}}},
  year         = {{2021}},
}

@article{31577,
  author       = {{Häsel-Weide, Uta and Schöttler, Christian}},
  issn         = {{ 2701-9012}},
  journal      = {{Zeitschrift für Mathematikdidaktik in Forschung & Praxis (ZMFP)}},
  number       = {{2}},
  title        = {{{Das Dezimalsystem verstehen – Bedeutung, Erkenntnisse, Anregungen}}},
  year         = {{2021}},
}

@article{32810,
  author       = {{Li, Jiaao and Ma, Yulai and Shi, Yongtang and Wang, Weifan and Wu, Yezhou}},
  issn         = {{0195-6698}},
  journal      = {{European Journal of Combinatorics}},
  keywords     = {{Discrete Mathematics and Combinatorics}},
  publisher    = {{Elsevier BV}},
  title        = {{{On 3-flow-critical graphs}}},
  doi          = {{10.1016/j.ejc.2021.103451}},
  volume       = {{100}},
  year         = {{2021}},
}

@inproceedings{28988,
  author       = {{Kirchhoff, Jonas}},
  booktitle    = {{The 1st Early Career Researchers Workshop Co-Located with ECSS 2021}},
  location     = {{Madrid}},
  title        = {{{Providing Decision Makers with Tailored Decision Support Systems}}},
  year         = {{2021}},
}

@inproceedings{21198,
  author       = {{Hanselle, Jonas Manuel and Tornede, Alexander and Wever, Marcel Dominik and Hüllermeier, Eyke}},
  location     = {{Delhi, India}},
  title        = {{{Algorithm Selection as Superset Learning: Constructing Algorithm Selectors from Imprecise Performance Data}}},
  year         = {{2021}},
}

@inproceedings{21813,
  author       = {{Hansmeier, Tim and Platzner, Marco}},
  booktitle    = {{GECCO '21: Proceedings of the Genetic and Evolutionary Computation Conference Companion}},
  isbn         = {{978-1-4503-8351-6}},
  location     = {{Lille, France}},
  pages        = {{1639–1647}},
  publisher    = {{Association for Computing Machinery (ACM)}},
  title        = {{{An Experimental Comparison of Explore/Exploit Strategies for the Learning Classifier System XCS}}},
  doi          = {{10.1145/3449726.3463159}},
  year         = {{2021}},
}

@phdthesis{21502,
  abstract     = {{Die vollständige Beschreibung fluiddynamischer und akustischer Vorgänge setzt voraus, dass die Eigenschaften des Fluids hinlänglich bekannt sind.Während Fluidkenngrößen, wie etwa die Schallgeschwindigkeit oder die Scherviskosität, für viele Flüssigkeiten über weite Bereiche des thermodynamischen Zustandsraums bekannt sind, existieren für die Volumenviskosität nur eine geringe Anzahl Messdaten.In dieser Arbeit wird daher ein Messverfahren zur selektiven Bestimmung der Volumenviskosität von Flüssigkeiten, basierend auf der Absorption von Ultraschallwellen, entwickelt und realisiert.Schwerpunkte bilden dabei der simulationsgestützte Entwurf von Algorithmen zur Auswertung der Messsignale sowie die Analyse und Weiterentwicklung einer Messanordnung, basierend auf dem Puls-Echo-Verfahren. Neben der Absorption im Fluid treten dabei weitere Effekte (zum Beispiel Beugung oder unvollständige Reflexion) auf, die das akustische Signal schwächen oder anderweitig beeinflussen. Die Entwicklung von Verfahren zur Trennung dieser Effekte von der akustischen Absorption bildet daher einen weiteren Schwerpunkt dieser Arbeit.Abschließend wird die Volumenviskosität aus der gemessenen akustischen Absorption für unterschiedliche Fluide in verschiedenen thermodynamischen Zuständen unter Zuhilfenahme anderer bekannter Fluidkenngrößen bestimmt sowie eine Unsicherheitsbetrachtung durchgeführt.}},
  author       = {{Claes, Leander}},
  pages        = {{223}},
  publisher    = {{Universiät Paderborn}},
  title        = {{{Messverfahren für die akustische Absorption in reinen Fluiden zur Bestimmung der Volumenviskosität}}},
  doi          = {{10.17619/UNIPB/1-1104}},
  year         = {{2021}},
}

@article{33278,
  abstract     = {{The kinetic Brownian motion on the sphere bundle of a Riemannian manifold M is a stochastic process that models a random perturbation of the geodesic flow. If M is an orientable compact constantly curved surface, we show that in the limit of infinitely large perturbation the L2-spectrum of the infinitesimal generator of a time-rescaled version of the process converges to the Laplace spectrum of the base manifold.}},
  author       = {{Kolb, Martin and Weich, Tobias and Wolf, Lasse}},
  journal      = {{Annales Henri Poincaré }},
  number       = {{4}},
  pages        = {{1283--1296}},
  publisher    = {{Springer Science + Business Media}},
  title        = {{{Spectral Asymptotics for Kinetic Brownian Motion on Surfaces of Constant Curvature}}},
  volume       = {{23}},
  year         = {{2021}},
}

@inproceedings{29938,
  abstract     = {{Modular solid-state transformers (SSTs) are a promising technology in converting power from a 10kV three-phase medium voltage to a lower DC-voltage in the range of 100…400V to provide pure DC power to applications such as electrolyzers for hydrogen generation, data centers with a DC power distribution and DC micro grids. Modular SSTs which can be interpreted as modular multilevel converters with an isolated DC-DC output stage per module, are designed with redundant modules to increase reliability. Usually, each of the three arms operates independently, and therefore, only a fixed number of faulty modules can be compensated in each arm, even if all modules are operational in the remaining two arms. With the proposed zero-sequence voltage injection, up to 100% more faulty modules can be compensated in an arm by employing the same hardware. In addition, module power imbalances are nearly eliminated by utilizing a fundamental frequency zero-sequence voltage. A dominant 3rd harmonic zero-sequence voltage injection in combination with the 5th, 7th and several higher order harmonics with adaptive (small) amplitudes minimize the required arm voltages at steady-state. For nominal operation or symmetrical faults, the proposed technique is equivalent to the well known Min-Max voltage injection, which already reduces the peak arm voltage by 13.4% compared to a constant star point potential. A statistical analysis proves, that the expected number of tolerable faulty modules of the 1MW SST increases by 12% without the need for additional hardware.}},
  author       = {{Unruh, Roland and Lange, Jarren and Schafmeister, Frank and Böcker, Joachim}},
  booktitle    = {{23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)}},
  isbn         = {{978-9-0758-1537-5}},
  keywords     = {{Solid-State Transformer, Zero sequence voltage, Fault handling strategy, Power balance control technique, Three-phase system}},
  location     = {{Ghent, Belgium}},
  publisher    = {{IEEE}},
  title        = {{{Adaptive Zero-Sequence Voltage Injection for Modular Solid-State Transformer to Compensate for Asymmetrical Fault Conditions}}},
  doi          = {{https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542}},
  year         = {{2021}},
}

@article{33481,
  abstract     = {{While 2D Gibbsian particle systems might exhibit orientational order resulting in a lattice-like structure, these particle systems do not exhibit positional order if the interaction between particles satisfies some weak assumptions. Here we investigate to which extent particles within a box of size may fluctuate from their ideal lattice position. We show that particles near the center of the box typically show a displacement at least of order . Thus we extend recent results on the hard disk model to particle systems with fairly arbitrary particle spins and interaction. Our result applies to models such as rather general continuum Potts type models, e.g. with Widom–Rowlinson or Lenard-Jones-type interaction.}},
  author       = {{Richthammer, Thomas and Fiedler, Michael}},
  journal      = {{Stochastic Processes and their Applications}},
  pages        = {{1--32}},
  publisher    = {{Elsevier}},
  title        = {{{A lower bound on the displacement of particles in 2D Gibbsian particle systems}}},
  doi          = {{https://doi.org/10.1016/j.spa.2020.10.003}},
  volume       = {{132}},
  year         = {{2021}},
}

@unpublished{27778,
  abstract     = {{Consider a set of jobs connected to a directed acyclic task graph with a
fixed source and sink. The edges of this graph model precedence constraints and
the jobs have to be scheduled with respect to those. We introduce the Server
Cloud Scheduling problem, in which the jobs have to be processed either on a
single local machine or on one of many cloud machines. Both the source and the
sink have to be scheduled on the local machine. For each job, processing times
both on the server and in the cloud are given. Furthermore, for each edge in
the task graph, a communication delay is included in the input and has to be
taken into account if one of the two jobs is scheduled on the server, the other
in the cloud. The server can process jobs sequentially, whereas the cloud can
serve as many as needed in parallel, but induces costs. We consider both
makespan and cost minimization. The main results are an FPTAS with respect for
the makespan objective for a fairly general case and strong hardness for the
case with unit processing times and delays.}},
  author       = {{Maack, Marten and Meyer auf der Heide, Friedhelm and Pukrop, Simon}},
  booktitle    = {{arXiv:2108.02109}},
  title        = {{{Full Version -- Server Cloud Scheduling}}},
  year         = {{2021}},
}