@article{24902, abstract = {{Social robots have emerged as a new digital technology that is increasingly being implemented in the educational landscape. While social robots could be deployed to assist young children with their learning in a variety of different ways, the typical approach in educational practices is to supplement the learning process rather than to replace the human caregiver, e.g., the teacher, parent, educator or therapist. When functioning in the role of an educational assistant, social robots will likely constitute a part of a triadic interaction with the child and the human caregiver. Surprisingly, there is little research that systematically investigates the role of the caregiver by examining the ways in which children involve or check in with them during their interaction with another partner—a phenomenon that is known as social referencing. In the present study, we investigated social referencing in the context of a dyadic child–robot interaction. Over the course of four sessions within our longitudinal language-learning study, we observed how 20 pre-school children aged 4–5 years checked in with their accompanying caregivers who were not actively involved in the language-learning procedure. The children participating in the study were randomly assigned to either an interaction with a social robot or a human partner. Our results revealed that all children across both conditions utilized social referencing behaviors to address their caregiver. However, we found that the children who interacted with the social robot did so significantly more frequently in each of the four sessions than those who interacted with the human partner. Further analyses showed that no significant change in their behavior over the course of the sessions could be observed. Findings are discussed with regard to the caregiver's role during children's interactions with social robots and the implications for future interaction design.}}, author = {{Tolksdorf, Nils Frederik and Crawshaw, Camilla E. and Rohlfing, Katharina J.}}, issn = {{2504-284X}}, journal = {{Frontiers in Education}}, title = {{{Comparing the Effects of a Different Social Partner (Social Robot vs. Human) on Children's Social Referencing in Interaction}}}, doi = {{10.3389/feduc.2020.569615}}, year = {{2021}}, } @article{45119, author = {{Kißgen, R. and Wirts, C. and Limburg, D. and Wertfein, M. and Franke, Sebastian and Wölfl, J. and Austermühle, J.}}, journal = {{Frühförderung interdisziplinär}}, pages = {{64--77}}, title = {{{Zur inklusiven Betreuung von Kindern mit (drohender) Behinderung in Kindertageseinrichtungen in Bayern und im Rheinland. Ein Studienvergleich}}}, volume = {{40}}, year = {{2021}}, } @inproceedings{57830, author = {{Büker, Ronja}}, booktitle = {{Junges Forum für Medien und Hochschulentwicklung}}, location = {{Hagen}}, title = {{{Selbstwirksamkeitsentwicklung von Studienanfänger*innen während der COVID-19 Pandemie - Vorstellung einer Interventionsstudie im WiSe 20/21}}}, year = {{2021}}, } @article{58083, author = {{Yaremkevich, Dmytro D. and Scherbakov, Alexey V. and Kukhtaruk, Serhii M. and Linnik, Tetiana L. and Khokhlov, Nikolay E. and Godejohann, Felix and Dyatlova, Olga A. and Nadzeyka, Achim and Pattnaik, Debi P. and Wang, Mu and Roy, Syamashree and Campion, Richard P. and Rushforth, Andrew W. and Gusev, Vitalyi E. and Akimov, Andrey V. and Bayer, Manfred }}, journal = {{ACS Nano}}, number = {{3}}, title = {{{Protected Long-Distance Guiding of Hypersound Underneath a Nanocorrugated Surface}}}, doi = {{10.1021/acsnano.0c09475}}, volume = {{15}}, year = {{2021}}, } @article{23993, author = {{Bahmanian, Meysam and Scheytt, Christoph}}, journal = {{IEEE Transactions on Microwave Theory and Techniques}}, number = {{3}}, pages = {{1635--1645}}, title = {{{A 2-20-GHz Ultralow Phase Noise Signal Source Using a Microwave Oscillator Locked to a Mode-Locked Laser}}}, doi = {{10.1109/tmtt.2020.3047647}}, volume = {{69}}, year = {{2021}}, } @inproceedings{65151, abstract = {{Jede Lernplattform mit der Möglichkeit zum gemeinsamen Online-Unterricht mit Videoschalten bietet als interaktives Angebot die digitale Umfrage an. Ihr Einsatz im Online-Unterricht ist wohl auf einer der unteren Schwierigkeitsstufen hinsichtlich der Erstellung von Seiten der Lehrkraft und der Handhabung von Seiten der Schüler*innen anzusiedeln. Daher liegt die These nahe, dass im Online-Unterricht digitale Umfragen häufig eingesetzt werden und damit eine der Praktiken sind, der im Online-Religionsunterricht eine viel größere Bedeutung als im analogen Religionsunterricht zukommt. Gerade an dieser Akteurin können daher Reflexionen zum möglichen Mehrwert von digitalen Elementen im Online-Religionsunterricht wie auch mögliche Paradoxien zwischen didaktischen Ansprüchen und der schulischen Wirklichkeit diskutiert werden. Der Beitrag basiert auf drei Frageperspektiven: Auf welche Weise strukturiert und organisiert die digitale Umfrage ihren Einsatz im virtuellen Raum des Online-Unterrichts? Welche Heterogenitäten der beteiligten Entitäten (Digitalität der Umfrage, Onlineschalten der beteiligten Personen) lassen sich praxeologisch entfalten? Welche Divergenzen scheinen zwischen didaktischer Wunschvorstellung und schulischer Unterrichtspraxis auf? Welchen Mehrwert bieten digitale Umfragen? }}, author = {{Keuchen, Marion}}, booktitle = {{Digitale Welten}}, editor = {{Brieden, Norbert and Mendl, Hans and Reis, Oliver and Roose, Hanna}}, location = {{Passau (fand digital statt)}}, pages = {{72--82}}, publisher = {{LUSA}}, title = {{{Die digitale Umfrage im Online-Religionsunterricht }}}, volume = {{12}}, year = {{2021}}, } @book{65145, abstract = {{Musik ist für den Menschen nach dem Praktischen Theologen Harald Schroeter-Wittke Unterhaltung. Für den Systematiker Karl Barth ist sie zudem Speise und Trank, Trost und Mahnung. 52 Beitragende aus Theologie, Kulturwissenschaft, Medienwissenschaft und Pädagogik loten in diesem Band die ganze Breite von Musik aus. Sie stellen ihr ganz individuelles Musikempfinden und -erleben sowie ihre eigenen Reflexionen über Musik als musikalisches Lebensmittel vor. Die Bandbreite ihrer Rationen reicht von klassischer Musik und Kirchenliedern hin zu Jazz, Rock und Popmusik. rezensiert: Herrmann, Katharina: Der Geist klingt, wie er will, in: Praktische Theologie (4/2022), 247-250. }}, editor = {{Keuchen, Marion and Janus, Richard}}, isbn = {{978-3-643-15025-7}}, pages = {{309}}, publisher = {{Lit}}, title = {{{Musik als Lebensmittel. Kulturwissenschaftlich-theologische Rationen für ein Jahr}}}, volume = {{8}}, year = {{2021}}, } @article{65154, abstract = {{Die ersten fünf der insgesamt zehn angeführten Impulse für kirchliches Bildungshandeln in der Evangelischen Kirche im Rheinland (EKiR) zeigen deutlich, dass eine detaillierte empirische Erfassung von konfessionslosen Menschen im Bildungsbereich allen weiteren Überlegungen vorausgehen muss, um überhaupt zu weiterführenden Analysen und Verstehensbemühungen zu gelangen und konkrete Orte und Situationen innerhalb der EKiR als „Kontaktflächen“ zu Konfessionslosen identifizieren zu können. Darauf aufbauend bieten die weiteren fünf Impulse Konkretionen für kirchliches Bildungshandeln unter dieser herausfordernden Perspektive im Pädagogisch-Theologischem Institut (PTI) als religionspädagogisches Institut der EKiR. }}, author = {{Keuchen, Marion}}, journal = {{TheoWeb. Zeitschrift für Religionspädagogik }}, keywords = {{Konfessionslosigkeit, kirchliche Bildungsarbeit, Kasualien, Elementarbildung, Religionsunterricht, Schulkultur, religionspädagogische Institute}}, pages = {{94--103}}, title = {{{Konfessionslosigkeit im Rheinland als religionspädagogische Herausforderung – Empirische Daten und zukunftsweisende Impulse }}}, doi = {{10.23770/tw0179}}, volume = {{1}}, year = {{2021}}, } @inproceedings{23401, author = {{Gürtler, Marius and Mandischer, Nils and Hüsing, Mathias and Corves, Burkhard and Pottebaum, Jens and Roesmann, Daniel and Gräßler, Iris}}, booktitle = {{7. IFToMM D-A-CH Konferenz 2021; 18. - 19. Feb. 2021 IFToMM D-A-CH}}, location = {{Universität Duisburg-Essen}}, publisher = {{DuEPublico2 Duisburg-Essen Publications online}}, title = {{{Ein reaktiver Modellierungsansatz für Mensch-Roboter-Kollaboration in Rettungs- und Brandszenarien der Feuerwehr}}}, doi = {{10.17185/DUEPUBLICO/74064}}, year = {{2021}}, } @article{57971, abstract = {{Repetitive TMS (rTMS) with a frequency of 5-10~Hz is widely used for language mapping. However, it may be accompanied by discomfort and is limited in the number and reliability of evoked language errors. We, here, systematically tested the influence of different stimulation frequencies (i.e., 10, 30, and 50 Hz) on tolerability, number, reliability, and cortical distribution of language errors aiming at improved language mapping. 15 right-handed, healthy subjects (m~=~8, median age: 29 yrs) were investigated in two sessions, separated by 2-5 days. In each session, 10, 30, and 50 Hz rTMS were applied over the left hemisphere in a randomized order during a picture naming task. Overall, 30 Hz rTMS evoked significantly more errors (20 $\pm$ 12{%}) compared to 50 Hz (12 $\pm$ 8{%}; p {\textless}.01), whereas error rates were comparable between 30/50 and 10~Hz (18 $\pm$ 11{%}). Across all conditions, a significantly higher error rate was found in Session 1 (19 $\pm$ 13{%}) compared to Session 2 (13 $\pm$ 7{%}, p {\textless}.05). The error rate was poorly reliable between sessions for 10 (intraclass correlation coefficient, ICC~=~.315) and 30 Hz (ICC~=~.427), whereas 50 Hz showed a moderate reliability (ICC~=~.597). Spatial reliability of language errors was low to moderate with a tendency toward increased reliability for higher frequencies, for example, within frontal regions. Compared to 10~Hz, both, 30 and 50 Hz were rated as less painful. Taken together, our data favor the use of rTMS-protocols employing higher frequencies for evoking language errors reliably and with reduced discomfort, depending on the region of interest.}}, author = {{Nettekoven, Charlotte and Pieczewski, Julia and Neuschmelting, Volker and Jonas, Kristina and Goldbrunner, Roland and Grefkes, Christian and Weiss Lucas, Carolin}}, journal = {{Human brain mapping}}, keywords = {{Adult, Brain Mapping, Cerebral Cortex/diagnostic imaging/physiology, Female, Humans, Magnetic Resonance Imaging, Male, Pattern Recognition, Psycholinguistics, Reproducibility of Results, Speech/physiology, Transcranial Magnetic Stimulation, Visual/physiology, Young Adult}}, number = {{16}}, pages = {{5309–5321}}, title = {{{Improving the efficacy and reliability of rTMS language mapping by increasing the stimulation frequency}}}, doi = {{10.1002/hbm.25619}}, volume = {{42}}, year = {{2021}}, } @book{60724, editor = {{Gerhards, L and Hüsgen, A and Jonas, Kristina and Quinting, J and Rosenkranz, A and Rubi-Fessen, I and Stenneken, P}}, title = {{{Abstractband zur 20. Jahrestagung der Gesellschaft für Aphasieforschung und –behandlung}}}, volume = {{S1}}, year = {{2021}}, } @inproceedings{25334, author = {{Fiterau-Brostean, Paul and Jonsson, Bengt and Merget, Robert and de Ruiter, Joeri and Sagonas, Konstantinos and Somorovsky, Juraj}}, booktitle = {{29th {USENIX} Security Symposium ({USENIX} Security 20)}}, isbn = {{978-1-939133-17-5}}, pages = {{2523--2540}}, publisher = {{{USENIX} Association}}, title = {{{Analysis of DTLS Implementations Using Protocol State Fuzzing}}}, year = {{2020}}, } @inproceedings{19606, abstract = {{Mobile shopping apps have been using Augmented Reality (AR) in the last years to place their products in the environment of the customer. While this is possible with atomic 3D objects, there is is still a lack in the runtime configuration of 3D object compositions based on user needs and environmental constraints. For this, we previously developed an approach for model-based AR-assisted product configuration based on the concept of Dynamic Software Product Lines. In this demonstration paper, we present the corresponding tool support ProConAR in the form of a Product Modeler and a Product Configurator. While the Product Modeler is an Angular web app that splits products (e.g. table) up into atomic parts (e.g. tabletop, table legs, funnier) and saves it within a configuration model, the Product Configurator is an Android client that uses the configuration model to place different product configurations within the environment of the customer. We show technical details of our ready to use tool-chain ProConAR by describing its implementation and usage as well as pointing out future research directions.}}, author = {{Gottschalk, Sebastian and Yigitbas, Enes and Schmidt, Eugen and Engels, Gregor}}, booktitle = {{Human-Centered Software Engineering. HCSE 2020}}, editor = {{Bernhaupt, Regina and Ardito, Carmelo and Sauer, Stefan}}, keywords = {{Product Configuration, Augmented Reality, Model-based, Tool Support}}, location = {{Eindhoven}}, publisher = {{Springer}}, title = {{{ProConAR: A Tool Support for Model-based AR Product Configuration}}}, doi = {{10.1007/978-3-030-64266-2_14}}, volume = {{12481}}, year = {{2020}}, } @inproceedings{19632, author = {{Jovanovikj, Ivan and Yigitbas, Enes and Sauer, Stefan and Engels, Gregor}}, booktitle = {{Proceedings of the 8th International Working Conference on Human-Centered Software Engineering (HCSE'20)}}, pages = {{216--224}}, publisher = {{Springer}}, title = {{{Augmented and Virtual Reality Object Repository for Rapid Prototyping }}}, year = {{2020}}, } @article{19679, abstract = {{In the present work, we provide an electronic structure based method for the “on-the-fly” determination of vibrational sum frequency generation (v-SFG) spectra. The predictive power of this scheme is demonstrated at the air-water interface. While the instantaneous fluctuations in dipole moment are obtained using the maximally localized Wannier functions, the fluctuations in polarizability are approximated to be proportional to the second moment of Wannier functions. The spectrum henceforth obtained captures the signatures of hydrogen bond stretching, bending, as well as low-frequency librational modes.}}, author = {{Ojha, Deepak and Kühne, Thomas D.}}, issn = {{1420-3049}}, journal = {{Molecules}}, title = {{{“On-The-Fly” Calculation of the Vibrational Sum-Frequency Generation Spectrum at the Air-Water Interface}}}, doi = {{10.3390/molecules25173939}}, volume = {{25}}, year = {{2020}}, } @article{19681, author = {{Salem, M. Alaraby and Kühne, Thomas D.}}, issn = {{0026-8976}}, journal = {{Molecular Physics}}, pages = {{1--6}}, title = {{{Insight from energy decomposition analysis on a hydrogen-bond-mediated mechanism for on-water catalysis}}}, doi = {{10.1080/00268976.2020.1797920}}, year = {{2020}}, } @phdthesis{19947, abstract = {{Ordinary differential equations (ODEs) and partial differential equations (PDEs) arise in most scientific disciplines that make use of mathematical techniques. As exact solutions are in general not computable, numerical methods are used to obtain approximate solutions. In order to draw valid conclusions from numerical computations, it is crucial to understand which qualitative aspects numerical solutions have in common with the exact solution. Symplecticity is a subtle notion that is related to a rich family of geometric properties of Hamiltonian systems. While the effects of preserving symplecticity under discretisation on long-term behaviour of motions is classically well known, in this thesis (a) the role of symplecticity for the bifurcation behaviour of solutions to Hamiltonian boundary value problems is explained. In parameter dependent systems at a bifurcation point the solution set to a boundary value problem changes qualitatively. Bifurcation problems are systematically translated into the framework of classical catastrophe theory. It is proved that existing classification results in catastrophe theory apply to persistent bifurcations of Hamiltonian boundary value problems. Further results for symmetric settings are derived. (b) It is proved that to preserve generic bifurcations under discretisation it is necessary and sufficient to preserve the symplectic structure of the problem. (c) The catastrophe theory framework for Hamiltonian ODEs is extended to PDEs with variational structure. Recognition equations for A-series singularities for functionals on Banach spaces are derived and used in a numerical example to locate high-codimensional bifurcations. (d) The potential of symplectic integration for infinite-dimensional Lie-Poisson systems (Burgers’ equation, KdV, fluid equations, . . . ) using Clebsch variables is analysed. It is shown that the advantages of symplectic integration can outweigh the disadvantages of integrating over a larger phase space introduced by a Clebsch representation. (e) Finally, the preservation of variational structure of symmetric solutions in multisymplectic PDEs by multisymplectic integrators on the example of (phase-rotating) travelling waves in the nonlinear wave equation is discussed.}}, author = {{Offen, Christian}}, publisher = {{Massey University}}, title = {{{Analysis of Hamiltonian boundary value problems and symplectic integration}}}, year = {{2020}}, } @article{20189, abstract = {{A dielectric step-index optical fiber with tube-like profile is considered, being positioned with a small gap on top of a dielectric slab waveguide. We propose a 2.5-D hybrid analytical/numerical coupled mode model for the evanescent excitation of the tube through semi-guided waves propagating in the slab at oblique angles. The model combines the directional polarized modes supported by the slab with analytic solutions for the TE-, TM-, and orbital-angular-momentum (OAM) modes of the tube-shaped fiber. Implementational details of the scheme are discussed, complemented by finite-element simulations for verification purposes. Our results include configurations with resonant in-fiber excitation of OAM modes with large orbital angular momentum and strong field enhancement.}}, author = {{Hammer, Manfred and Ebers, Lena and Förstner, Jens}}, issn = {{0306-8919}}, journal = {{Optical and Quantum Electronics}}, keywords = {{tet_topic_waveguides}}, title = {{{Hybrid coupled mode modelling of the evanescent excitation of a dielectric tube by semi-guided waves at oblique angles}}}, doi = {{10.1007/s11082-020-02595-z}}, volume = {{52}}, year = {{2020}}, } @article{20233, abstract = {{The challenge of designing new tunable nonlinear dielectric materials with tailored properties has attracted an increasing amount of interest recently. Herein, we study the effective nonlinear dielectric response of a stochastic paraelectric-dielectric composite consisting of equilibrium distributions of circular and partially penetrable disks (or parallel, infinitely long, identical, partially penetrable, circular cylinders) of a dielectric phase randomly dispersed in a continuous matrix of a paraelectric phase. The random microstructures were generated using the Metropolis Monte Carlo algorithm. The evaluation of the effective permittivity and tunability were carried out by employing either a Landau thermodynamic model or its Johnson’s approximation to describe the field-dependent permittivity of the paraelectric phase and solving continuum-electrostatics equations using finite element calculations. We reveal that the percolation threshold in this composite governs the critical behavior of the effective permittivity and tunability. For microstructures below the percolation threshold, our simulations demonstrate a strong nonlinear behaviour of the field-dependent effective permittivity and very high tunability that increases as a function of dielectric phase concentration. Above the percolation threshold, the effective permittivity shows the tendency to linearization and the tunability dramatically drops down. The highly reduced permittivity and extraordinarily high tunability are obtained for the composites with dielectric impenetrable disks at high concentrations, in which the triggering of the percolation transition is avoided. The reported results cast light on distinct nonlinear behaviour of 2D and 3D stochastic composites and can guide the design of novel composites with the controlled morphology and tailored permittivity and tunability.}}, author = {{Myroshnychenko, Viktor and Smirnov, Stanislav and Jose, Pious Mathews Mulavarickal and Brosseau, Christian and Förstner, Jens}}, issn = {{1359-6454}}, journal = {{Acta Materialia}}, pages = {{116432}}, title = {{{Nonlinear dielectric properties of random paraelectric-dielectric composites}}}, doi = {{10.1016/j.actamat.2020.10.051}}, volume = {{203}}, year = {{2020}}, } @inproceedings{20276, author = {{Beyer, Dirk and Wehrheim, Heike}}, booktitle = {{Leveraging Applications of Formal Methods, Verification and Validation: Verification Principles - 9th International Symposium on Leveraging Applications of Formal Methods, ISoLA 2020, Rhodes, Greece, October 20-30, 2020, Proceedings, Part {I}}}, editor = {{Margaria, Tiziana and Steffen, Bernhard}}, pages = {{143--167}}, publisher = {{Springer}}, title = {{{Verification Artifacts in Cooperative Verification: Survey and Unifying Component Framework}}}, doi = {{10.1007/978-3-030-61362-4\_8}}, volume = {{12476}}, year = {{2020}}, }