@article{47951, abstract = {{Thin film lithium niobate has been of great interest recently, and an understanding of periodically poled thin films is crucial for both fundamental physics and device developments. Second-harmonic (SH) microscopy allows for the noninvasive visualization and analysis of ferroelectric domain structures and walls. While the technique is well understood in bulk lithium niobate, SH microscopy in thin films is largely influenced by interfacial reflections and resonant enhancements, which depend on film thicknesses and substrate materials. We present a comprehensive analysis of SH microscopy in x-cut lithium niobate thin films, based on a full three-dimensional focus calculation and accounting for interface reflections. We show that the dominant signal in backreflection originates from a copropagating phase-matched process observed through reflections, rather than direct detection of the counterpropagating signal as in bulk samples. We simulate the SH signatures of domain structures by a simple model of the domain wall as an extensionless transition from a −χ(2) to a +χ(2) region. This allows us to explain the main observation of domain structures in the thin-film geometry, and, in particular, we show that the SH signal from thin poled films allows to unambiguously distinguish areas, which are completely or only partly inverted in depth.}}, author = {{Rüsing, Michael and Zhao, J. and Mookherjea, S.}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, keywords = {{General Physics and Astronomy}}, number = {{11}}, publisher = {{AIP Publishing}}, title = {{{Second harmonic microscopy of poled x-cut thin film lithium niobate: Understanding the contrast mechanism}}}, doi = {{10.1063/1.5113727}}, volume = {{126}}, year = {{2019}}, } @misc{48019, author = {{Meusel, Sarah and Abendroth, Sonja and Hoeft, Maike and Albers, Timm}}, title = {{{Leitfaden zur Gestaltung von Zugängen}}}, year = {{2019}}, } @inproceedings{15237, abstract = {{This paper presents an approach to voice conversion, whichdoes neither require parallel data nor speaker or phone labels fortraining. It can convert between speakers which are not in thetraining set by employing the previously proposed concept of afactorized hierarchical variational autoencoder. Here, linguisticand speaker induced variations are separated upon the notionthat content induced variations change at a much shorter timescale, i.e., at the segment level, than speaker induced variations,which vary at the longer utterance level. In this contribution wepropose to employ convolutional instead of recurrent networklayers in the encoder and decoder blocks, which is shown toachieve better phone recognition accuracy on the latent segmentvariables at frame-level due to their better temporal resolution.For voice conversion the mean of the utterance variables is re-placed with the respective estimated mean of the target speaker.The resulting log-mel spectra of the decoder output are used aslocal conditions of a WaveNet which is utilized for synthesis ofthe speech waveforms. Experiments show both good disentan-glement properties of the latent space variables, and good voiceconversion performance.}}, author = {{Gburrek, Tobias and Glarner, Thomas and Ebbers, Janek and Haeb-Umbach, Reinhold and Wagner, Petra}}, booktitle = {{Proc. 10th ISCA Speech Synthesis Workshop}}, location = {{Vienna}}, pages = {{81--86}}, title = {{{Unsupervised Learning of a Disentangled Speech Representation for Voice Conversion}}}, doi = {{10.21437/SSW.2019-15}}, year = {{2019}}, } @inproceedings{15794, abstract = {{In this paper we present our audio tagging system for the DCASE 2019 Challenge Task 2. We propose a model consisting of a convolutional front end using log-mel-energies as input features, a recurrent neural network sequence encoder and a fully connected classifier network outputting an activity probability for each of the 80 considered event classes. Due to the recurrent neural network, which encodes a whole sequence into a single vector, our model is able to process sequences of varying lengths. The model is trained with only little manually labeled training data and a larger amount of automatically labeled web data, which hence suffers from label noise. To efficiently train the model with the provided data we use various data augmentation to prevent overfitting and improve generalization. Our best submitted system achieves a label-weighted label-ranking average precision (lwlrap) of 75.5% on the private test set which is an absolute improvement of 21.7% over the baseline. This system scored the second place in the teams ranking of the DCASE 2019 Challenge Task 2 and the fifth place in the Kaggle competition “Freesound Audio Tagging 2019” with more than 400 participants. After the challenge ended we further improved performance to 76.5% lwlrap setting a new state-of-the-art on this dataset.}}, author = {{Ebbers, Janek and Haeb-Umbach, Reinhold}}, booktitle = {{DCASE2019 Workshop, New York, USA}}, title = {{{Convolutional Recurrent Neural Network and Data Augmentation for Audio Tagging with Noisy Labels and Minimal Supervision}}}, year = {{2019}}, } @inproceedings{15796, abstract = {{In this paper we consider human daily activity recognition using an acoustic sensor network (ASN) which consists of nodes distributed in a home environment. Assuming that the ASN is permanently recording, the vast majority of recordings is silence. Therefore, we propose to employ a computationally efficient two-stage sound recognition system, consisting of an initial sound activity detection (SAD) and a subsequent sound event classification (SEC), which is only activated once sound activity has been detected. We show how a low-latency activity detector with high temporal resolution can be trained from weak labels with low temporal resolution. We further demonstrate the advantage of using spatial features for the subsequent event classification task.}}, author = {{Ebbers, Janek and Drude, Lukas and Haeb-Umbach, Reinhold and Brendel, Andreas and Kellermann, Walter}}, booktitle = {{CAMSAP 2019, Guadeloupe, West Indies}}, title = {{{Weakly Supervised Sound Activity Detection and Event Classification in Acoustic Sensor Networks}}}, year = {{2019}}, } @inproceedings{15792, abstract = {{In this paper we highlight the privacy risks entailed in deep neural network feature extraction for domestic activity monitoring. We employ the baseline system proposed in the Task 5 of the DCASE 2018 challenge and simulate a feature interception attack by an eavesdropper who wants to perform speaker identification. We then propose to reduce the aforementioned privacy risks by introducing a variational information feature extraction scheme that allows for good activity monitoring performance while at the same time minimizing the information of the feature representation, thus restricting speaker identification attempts. We analyze the resulting model’s composite loss function and the budget scaling factor used to control the balance between the performance of the trusted and attacker tasks. It is empirically demonstrated that the proposed method reduces speaker identification privacy risks without significantly deprecating the performance of domestic activity monitoring tasks.}}, author = {{Nelus, Alexandru and Ebbers, Janek and Haeb-Umbach, Reinhold and Martin, Rainer}}, booktitle = {{INTERSPEECH 2019, Graz, Austria}}, title = {{{Privacy-preserving Variational Information Feature Extraction for Domestic Activity Monitoring Versus Speaker Identification}}}, year = {{2019}}, } @misc{49747, author = {{Huybrechts, Yves}}, publisher = {{BelgienNet}}, title = {{{Die Antwerpener Börse - Aufstieg, Niedergang und Wandel (VIDEO)}}}, year = {{2019}}, } @article{49878, author = {{Neiske, Iris and Vöing, Nera}}, issn = {{1860-3033}}, journal = {{Personal- und Organisationsentwicklung Forum für Führung, Moderation, Training, Programm-Organisation in Einrichtungen der Lehre und Forschung}}, number = {{3+4}}, pages = {{74--78}}, title = {{{Tätigkeitsbericht 2007-2017 der Stabsstelle Bildungsinnovationen und Hochschuldidaktik der Universität Paderborn}}}, volume = {{14}}, year = {{2019}}, } @article{49874, author = {{Neiske, Iris}}, issn = {{1434-9736}}, journal = {{Paderborner Universitätszeitschrift (puz)}}, pages = {{77}}, title = {{{Kurz berichtet. Das E-Tutoren-Programm an der UPB.}}}, year = {{2019}}, } @article{32156, abstract = {{How do ideas come into being? Our contribution takes its starting point in an observation we made in empirical data from a prior study. The data center around an instant of an academic writer’s thinking during the revision of a scientific paper. Through a detailed discourse-oriented micro-analysis, we zoom in on the writer’s thinking activity and uncover the genesis of a complex idea through a sequence of interrelated moments. These moments feature different degrees of “crystallization” of the idea; from gestures, a sketch, a short written note, oral explanations to a final spelled-out written argument. For this contribution, we re-analyze the material, asking how the idea gets formed during the thinking process and how it reaches a tangible form, which is understandable both for the thinker and for other persons. We root our analysis in a notion of language as social, embodied, and dialogical activity, drawing on concepts from Humboldt, Jakubinskij, and Vygotsky. We focus our analysis on three conceptual nodes. The first node is the ebbing and advancing of language in idea formation – observable as a trajectory through linguistically more condensed or more expanded utterance forms. The second node is the degree of objectification that the idea reaches when it is performed differently in a variety of addressivity constellations, i.e., whether and how it becomes understandable to the thinker and to others in the social sphere. Finally, the third node is the saturation of the idea through what we call intrapersonal intertextuality, i.e., its complex and dialogically related re-articulations in a sequence of formative moments. With these considerations, we articulate a clear consequence for theorizing thinking. We hold that thinking is social, embodied, and dialogically organized because it is entangled with language. Ideas come into being and become understandable and communicable to other persons only by and within their different, yet, intertextually related formations.}}, author = {{Karsten, Andrea and Bertau, Marie-Cécile}}, journal = {{Frontiers in Psychology}}, keywords = {{idea formation, language activity, objectification, intrapersonal intertextuality, articulation, Jakubinskij, Vygotsky, Humboldt}}, title = {{{How ideas come into being: Tracing intertextual moments in grades of objectification and publicness}}}, doi = {{10.3389/fpsyg.2019.02355}}, volume = {{10}}, year = {{2019}}, } @inproceedings{50196, author = {{Hohmann, Sascha}}, booktitle = {{PhyDid B}}, editor = {{Grötzebauch, Helmuth}}, issn = {{2191-379X}}, location = {{Aachen}}, number = {{2019}}, pages = {{31--36}}, title = {{{Wie groß ist ein Neutronenstern? Elementarisierende Überlegungen und Abschätzungen}}}, year = {{2019}}, } @article{4996, abstract = {{We analyze the impact of wealth taxes on investment timing decisions under uncertainty and irreversibility by employing a real options model of the Dixit/Pindyck type. Considering that wealth taxes have been (re-)introduced or are under discussion in many countries, investors need decision rules for tax systems with wealth taxation. We integrate different valuation methods for wealth tax purposes, distinguish between broadly and narrowly defined wealth taxes and vary the wealth tax rate to ascertain which wealth tax design is more or less likely to accelerate or delay investment. Our main findings are threefold. First, historical cost valuation reduces the distortive timing effects of wealth taxation compared to fair value accounting. Second, broadening the wealth tax base tends to accelerate investment during high interest rate periods and delay investment during low interest rate periods. Our results predict that wealth taxes with a broad tax base are likely to discourage risky investment in times of near-zero interest rates. These distortive wealth tax base effects, however, can be avoided by granting sufficiently high depreciation deductions for wealth tax purposes. Third, the investment timing effects of wealth tax rate variations are very sensitive to the riskiness of the underlying investment. Moreover, investment timing effects crucially depend upon the depreciation rate for wealth tax purposes. A tax legislator who aims to encourage risk taking should introduce generous depreciation deductions. Our study indicates that if a wealth tax is considered to be politically inevitable, possible harmful investment effects can be mitigated by choosing appropriate valuation methods and parameters.}}, author = {{Niemann, Rainer and Sureth-Sloane, Caren}}, issn = {{0044-2372}}, journal = {{Journal of Business Economics}}, number = {{4}}, pages = {{385--415}}, publisher = {{Springer Nature America, Inc}}, title = {{{Investment Timing Effects of Wealth Taxes under Uncertainty and Irreversibility}}}, doi = {{10.1007/s11573-018-0918-4}}, volume = {{89}}, year = {{2019}}, } @book{36506, editor = {{Taschl-Erber, Andrea and Feichtinger, Christian }}, title = {{{New Quick And Easy Publication - Will be edited by LibreCat team}}}, year = {{2019}}, } @article{50868, author = {{Blank, Andreas}}, journal = {{British Journal for the History of Philosophy }}, number = {{3}}, pages = {{513--534}}, title = {{{“Self-Knowledge and Varieties of Human Excellence in the French Moralists.” }}}, volume = {{27}}, year = {{2019}}, } @article{51323, abstract = {{Sebastian Zicks erziehungswissenschaftliche Kritik des Mobilitätsimperativs ist Ausgangspunkt unseres Beitrags. Wir greifen diese Kritik auf, indem wir sie in zweifacher Hinsicht ergänzen: Erstens um einen Fokus auf soziale Mobilität, welche sich in Mobilitätsnarrativen mit räumlicher Mobilität als verwoben zeigt. Zweitens um die Perspektive auf Mobilität als Rückkehr, die wir von einer Perspektive auf Mobilität als Fortbewegung abgrenzen. Die Rückwärtsbewegung ist für uns eng an (Selbst-)Reflexionen und transformatorische Bildungsprozesse gebunden, wie sie in Didier Eribons autosozioanalytischem Vorhaben einer Rückkehr zu erkennen sind. Unsere Ausführungen münden erstens in einer Kritik am Imperativ des Bildungsaufstiegs, in dem mehr Bildung scheinbar immer mit individuellen und kollektiven Fortschritten einhergeht. Zweitens wenden wir die von uns herausgearbeitete Kritik reflexiv auf die Erziehungswissenschaft. Sie ist dann eine Verunsicherungswissenschaft, für die die Rückkehr, und damit das Hinterfragen eigener Selbstverständlichkeiten, konstitutiv ist.}}, author = {{Haker, Christoph and Otterspeer, Lukas}}, issn = {{2567-5974}}, journal = {{Debatte. Beiträge zur Erwachsenenbildung}}, keywords = {{Rehabilitation, Physical Therapy, Sports Therapy and Rehabilitation, General Medicine}}, number = {{2-2019}}, pages = {{161--176}}, publisher = {{Verlag Barbara Budrich GmbH}}, title = {{{Erziehungswissenschaft als Verunsicherungswissenschaft. Nicht nur eine Kritik des Mobilitätsimperativs}}}, doi = {{10.3224/debatte.v2i2.04}}, volume = {{2}}, year = {{2019}}, } @article{51321, author = {{Otterspeer, Lukas and Haker, Christoph}}, issn = {{0044-3247}}, journal = {{Zeitschrift für Pädagogik}}, number = {{5}}, pages = {{771--789}}, publisher = {{Beltz Juventa}}, title = {{{Empirische Bildungsforschung im Wirbel unmittelbarer Rezeption}}}, doi = {{10.3262/ZP1905769}}, year = {{2019}}, } @article{52107, author = {{Ried, Dennis}}, journal = {{Mitteilungen der IMRG}}, number = {{35}}, pages = {{5--17}}, publisher = {{Internationale Max-Reger-Gesellschaft}}, title = {{{Zwischen Komposition, Aufführung und Herausgabe}}}, year = {{2019}}, } @misc{34657, author = {{Hoyer, Isabelle and Reis, Oliver}}, booktitle = {{Das Wissenschaftlich-Religionspädagogische Lexikon (WiReLex)}}, title = {{{Art. ‚Lernumgebung / vorbereiteter Klassenraum‘}}}, year = {{2019}}, } @article{46850, author = {{Flath, Beate}}, issn = {{2079-3871}}, journal = {{IASPM Journal}}, number = {{2}}, pages = {{83--85}}, publisher = {{IASMP}}, title = {{{IASPM D-A-CH. Current issues and perspectives}}}, volume = {{9}}, year = {{2019}}, } @misc{46820, booktitle = {{IASPM Journal }}, editor = {{Flath, Beate and Behr, Adam and Cloonan, Martin }}, issn = {{2079-3871}}, pages = {{No.1}}, publisher = {{IASPM}}, title = {{{Pop music festivals and (cultural) policies}}}, volume = {{Vol. 9}}, year = {{2019}}, }