@unpublished{21634, abstract = {{Predictive control of power electronic systems always requires a suitable model of the plant. Using typical physics-based white box models, a trade-off between model complexity (i.e. accuracy) and computational burden has to be made. This is a challenging task with a lot of constraints, since the model order is directly linked to the number of system states. Even though white-box models show suitable performance in most cases, parasitic real-world effects often cannot be modeled satisfactorily with an expedient computational load. Hence, a Koopman operator-based model reduction technique is presented which directly links the control action to the system's outputs in a black-box fashion. The Koopman operator is a linear but infinite-dimensional operator describing the dynamics of observables of nonlinear autonomous dynamical systems which can be nicely applied to the switching principle of power electronic devices. Following this data-driven approach, the model order and the number of system states are decoupled which allows us to consider more complex systems. Extensive experimental tests with an automotive-type permanent magnet synchronous motor fed by an IGBT 2-level inverter prove the feasibility of the proposed modeling technique in a finite-set model predictive control application.}}, author = {{Hanke, Sören and Peitz, Sebastian and Wallscheid, Oliver and Klus, Stefan and Böcker, Joachim and Dellnitz, Michael}}, booktitle = {{arXiv:1804.00854}}, title = {{{Koopman Operator-Based Finite-Control-Set Model Predictive Control for Electrical Drives}}}, year = {{2018}}, } @article{1765, author = {{Huang, Lingling and Zhang, Shuang and Zentgraf, Thomas}}, issn = {{2192-8614}}, journal = {{Nanophotonics}}, number = {{6}}, pages = {{1169--1190}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Metasurface holography: from fundamentals to applications}}}, doi = {{10.1515/nanoph-2017-0118}}, volume = {{7}}, year = {{2018}}, } @unpublished{17713, author = {{Wever, Marcel Dominik and Mohr, Felix and Hüllermeier, Eyke}}, publisher = {{Arxiv}}, title = {{{Automated Multi-Label Classification based on ML-Plan}}}, year = {{2018}}, } @unpublished{17714, author = {{Mohr, Felix and Wever, Marcel Dominik and Hüllermeier, Eyke}}, title = {{{Automated machine learning service composition}}}, year = {{2018}}, } @inproceedings{22183, abstract = {{Function integration is a key issue for an efficient and economic usage of Additive Manufacturing. An efficient heat transfer by topology optimized structures is a rarely considered approach which will be outlined with an exemplary electronic housing which has been newly designed. A commercial projector unit, whose electrical components in total produce 38 W, shall be integrated in the closed housing and passively cooled by natural convection. Topology optimized structures shall be generated in the inner part of the housing to transfer the heat homogenously from the projector components to the housing wall while simultaneously minimizing the mass. At the outside of the housing walls, lattice and rib structures are applied to increase the effective surface for heat transfer by natural convection and radiation. Furthermore, the housing geometry is optimized regarding a minimization of support structures to reduce the post-processing effort. Finally, the housing shall be built of AlSi10Mg by SLM.}}, author = {{Menge, Dennis and Delfs, Patrick and Töws, Marcel and Schmid, Hans-Joachim}}, booktitle = {{29th Annual International Solid Freeform Fabrication Symposium}}, pages = {{687--697}}, title = {{{Topology Optimized Heat Transfer Using the Example of an Electronic Housing}}}, volume = {{29}}, year = {{2018}}, } @inproceedings{2332, abstract = {{Ein wichtiges Element der Digitalen Transformation ist die Digitalisierung der Prozesse in Unternehmen. Eine Herausforderung besteht hierbei in der systematischen Erkennung von Digitalisierungspotenzialen in Prozessen. Bestehende Ansätze benötigen Experten, welche Potenziale über ihre Erfahrung oder zeitaufwendig mithilfe von Musterkatalogen identifizieren. In diesem Artikel werden verschiedene Digitalisierungspotenziale klassifiziert und Muster für ein zukünftiges musterbasiertes Analyseverfahren zur automatisierten Identifikation von Digitalisierungspotenzialen in BPMN-Diagrammen beschrieben. Im Vergleich zu bestehenden Ansätzen erlaubt es Experten die Identifizierung von Digitalisierungspotenzialen effizienter und effektiver durchzuführen.}}, author = {{Rittmeier, Florian and Engels, Gregor and Teetz, Alexander}}, booktitle = {{Joint Proceedings of the Workshops at Modellierung 2018 co-located with Modellierung 2018, Braunschweig, Germany, February 21, 2018.}}, keywords = {{Digitalisierungspotenziale, BPI, Digitale Transformation, Information Flow-Modellierung, Patterns, Requirements Engineering}}, pages = {{215----221}}, publisher = {{CEUR-WS.org}}, title = {{{Digitalisierungspotenziale in Geschäftsprozessen effizient und effektiv erkennen (Effective and Efficient Identification of Digitalization Potentials in Business Processes)}}}, volume = {{2060}}, year = {{2018}}, } @book{21817, author = {{Goller, Michael}}, isbn = {{978-3-946023-04-3}}, keywords = {{Bahnhofsmission, Survey Feedback, Monitoring}}, pages = {{200}}, publisher = {{IN VIA Verlag}}, title = {{{Monitoring für die Bahnhofsmissionen: Ein datengestütztes Instrument zur Organisationsentwicklung. Projektbeschreibung und Ergebnisdarstellung}}}, year = {{2018}}, } @inproceedings{7766, author = {{Schumacher, Jan}}, booktitle = {{Beiträge zum Mathematikunterricht 2018}}, publisher = {{WTM-Verlag}}, title = {{{Semiotische Analyse von Sinnkonstruktionsprozessen bei einem innermathematischen Zugang zum Erlernen negativer Zahlen}}}, year = {{2018}}, } @inproceedings{5675, abstract = {{When responding to natural disasters, professional relief units are often supported by many volunteers which are not affiliated to humanitarian organizations. The effective coordination of these volunteers is crucial to leverage their capabilities and to avoid conflicts with professional relief units. In this paper, we empirically identify key requirements that professional relief units pose on this coordination. Based on these requirements, we suggest a decision model. We computationally solve a real-world instance of the model and empirically validate the computed solution in interviews with practitioners. Our results show that the suggested model allows for solving volunteer coordination tasks of realistic size near-optimally within short time, with the determined solution being well accepted by practitioners. We also describe in this article how the suggested decision support model is integrated in the volunteer coordination system which we develop in joint cooperation with a disaster management authority and a software development company.}}, author = {{Rauchecker, Gerhard and Schryen, Guido}}, booktitle = {{Proceedings of the 15th International Conference on Information Systems for Crisis Response and Management}}, keywords = {{Coordination of spontaneous volunteers, volunteer coordination system, decision support, scheduling optimization model, linear programming}}, location = {{Rochester, NY, USA}}, title = {{{Decision Support for the Optimal Coordination of Spontaneous Volunteers in Disaster Relief}}}, year = {{2018}}, } @inproceedings{5681, author = {{Prester, Julian and Wagner, Gerit and Schryen, Guido}}, booktitle = {{Proceedings of the 2018 International Conference on Information Systems (ICIS 2018)}}, location = {{San Francisco, CA, USA}}, title = {{{Classifying the Ideational Impact of IS Review Articles: A Natural Language Processing Based Approach}}}, year = {{2018}}, } @inproceedings{6016, author = {{Peuster, Manuel and Karl, Holger}}, booktitle = {{IEEE/IFIP 14th International Conference on Network and Service Management (CNSM)}}, location = {{Rome}}, publisher = {{IEEE/IFIP}}, title = {{{Understand your chains and keep your deadlines: Introducing time-constrained profiling for NFV}}}, year = {{2018}}, } @article{6095, author = {{Tünnermann, Jan and Scharlau, Ingrid}}, issn = {{2411-5150}}, journal = {{Vision}}, number = {{3}}, publisher = {{MDPI AG}}, title = {{{Stuck on a plateau? A model-based approach to fundamental issues in visual temporal-order judgments}}}, doi = {{10.3390/vision2030029}}, volume = {{2}}, year = {{2018}}, } @book{6164, author = {{Schillinger, Rolf and Schryen, Guido}}, isbn = {{978-3-88246-374-3}}, publisher = {{University of Regensburg}}, title = {{{Security in Highly Connected IT Systems – Results of the Bavarian Research Alliance FORSEC}}}, doi = {{10.5283/epub.36264}}, year = {{2018}}, } @inproceedings{4778, abstract = {{As data driven decision-making using business intelligence and analytics (BI&A) becomes standard in companies, the importance of mitigating the accompanying growth in costs increases. Research shows that increasing transparency to the granularity of individual BI&A artefacts such as reports or analytic applications is a necessary means, but in practice the introduction of said systems is cumbersome and adoption is slow. We address the status quo of BI&A cost accounting for three types of stakeholders: users, developers and managers. The results show in which areas of application a strong need for action exists and we identify major challenges for further research are ahead. Our findings indicate for example that managers at the same time regard cost accounting for BI&A with a higher potential benefit while they also believe they have already established a higher degree of implementation in their enterprises compared to the other stakeholder types. We conclude that BI&A professionals have to consider these different perceptions to run a successful department and gain traction for BI&A cost accounting.}}, author = {{Grytz, Raphael and Krohn-Grimberghe, Artus}}, booktitle = {{Proceedings of the 51st Hawaii International Conference on System Sciences}}, isbn = {{9780998133119}}, publisher = {{Hawaii International Conference on System Sciences}}, title = {{{Business Intelligence & Analytics Cost Accounting: A Survey on the Perceptions of Stakeholders}}}, doi = {{10.24251/hicss.2018.095}}, year = {{2018}}, } @article{4982, author = {{Hoyer, Britta and Rosenkranz, Stephanie}}, journal = {{Games}}, number = {{4}}, publisher = {{MDPI}}, title = {{{ Determinants of Equilibrium Selection in Network Formation - An Experiment}}}, volume = {{9}}, year = {{2018}}, } @article{8751, abstract = {{Multiobjective optimization plays an increasingly important role in modern applications, where several criteria are often of equal importance. The task in multiobjective optimization and multiobjective optimal control is therefore to compute the set of optimal compromises (the Pareto set) between the conflicting objectives. The advances in algorithms and the increasing interest in Pareto-optimal solutions have led to a wide range of new applications related to optimal and feedback control, which results in new challenges such as expensive models or real-time applicability. Since the Pareto set generally consists of an infinite number of solutions, the computational effort can quickly become challenging, which is particularly problematic when the objectives are costly to evaluate or when a solution has to be presented very quickly. This article gives an overview of recent developments in accelerating multiobjective optimal control for complex problems where either PDE constraints are present or where a feedback behavior has to be achieved. In the first case, surrogate models yield significant speed-ups. Besides classical meta-modeling techniques for multiobjective optimization, a promising alternative for control problems is to introduce a surrogate model for the system dynamics. In the case of real-time requirements, various promising model predictive control approaches have been proposed, using either fast online solvers or offline-online decomposition. We also briefly comment on dimension reduction in many-objective optimization problems as another technique for reducing the numerical effort.}}, author = {{Peitz, Sebastian and Dellnitz, Michael}}, issn = {{2297-8747}}, journal = {{Mathematical and Computational Applications}}, number = {{2}}, title = {{{A Survey of Recent Trends in Multiobjective Optimal Control—Surrogate Models, Feedback Control and Objective Reduction}}}, doi = {{10.3390/mca23020030}}, volume = {{23}}, year = {{2018}}, } @article{4165, abstract = {{Metal nanoparticles host localized plasmon excitations that allow the manipulation of optical fields at the nanoscale. Despite the availability of several techniques for imaging plasmons, direct access into the symmetries of these excitations remains elusive, thus hindering progress in the development of applications. Here, we present a combination of angle-, polarization-, and space-resolved cathodoluminescence spectroscopy methods to selectively access the symmetry and degeneracy of plasmonic states in lithographically fabricated gold nanoprisms. We experimentally reveal and spatially map degenerate states of multipole plasmon modes with nanometer spatial resolution and further provide recipes for resolving optically dark and out-of-plane modes. Full-wave simulations in conjunction with a simple tight-binding model explain the complex plasmon structure in these particles and reveal intriguing mode-symmetry phenomena. Our approach introduces systematics for a comprehensive symmetry characterization of plasmonic states in high-symmetry nanostructures.}}, author = {{Myroshnychenko, Viktor and Nishio, Natsuki and García de Abajo, F. Javier and Förstner, Jens and Yamamoto, Naoki}}, issn = {{1936-0851}}, journal = {{ACS Nano}}, keywords = {{tet_topic_plasmonics}}, number = {{8}}, pages = {{8436--8446}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution}}}, doi = {{10.1021/acsnano.8b03926}}, volume = {{12}}, year = {{2018}}, } @article{4324, abstract = {{We study the dependence of the intensity and linear polarization of light scattered by isolated particles with the compact irregular shape on their size using the discontinuous Galerkin time domain numerical method. The size parameter of particles varies in the range of X = 10 to 150, and the complex refractive index is m = 1.5 + 0i. Our results show that the backscattering negative polarization branch weakens monotonously, but does not disappear at large sizes, up to the geometrical optics regime, and can be simulated without accounting for wave effects. The intensity backscattering surge becomes narrower with increasing particle size. For X = 150, the surge width is several degrees.}}, author = {{Grynko, Yevgen and Shkuratov, Yuriy and Förstner, Jens}}, issn = {{0146-9592}}, journal = {{Optics Letters}}, keywords = {{tet_topic_scattering}}, number = {{15}}, pages = {{3562}}, publisher = {{The Optical Society}}, title = {{{Intensity surge and negative polarization of light from compact irregular particles}}}, doi = {{10.1364/ol.43.003562}}, volume = {{43}}, year = {{2018}}, } @inproceedings{4349, abstract = {{Physician Review Websites allow users to evaluate their experiences with health services. As these evaluations are regularly contextualized with facts from users’ private lives, they often accidentally disclose personal information on the Web. This poses a serious threat to users’ privacy. In this paper, we report on early work in progress on “Text Broom”, a tool to detect privacy breaches in user-generated texts. For this purpose, we conceptualize a pipeline which combines methods of Natural Language Processing such as Named Entity Recognition, linguistic patterns and domain-specific Machine Learning approaches which have the potential to recognize privacy violations with wide coverage. A prototypical web application is openly accesible.}}, author = {{Bäumer, Frederik Simon and Kersting, Joschka and Orlikowski, Matthias and Geierhos, Michaela}}, booktitle = {{Proceedings of the Posters and Demos Track of the 14th International Conference on Semantic Systems co-located with the 14th International Conference on Semantic Systems (SEMANTiCS 2018)}}, editor = {{Khalili, Ali and Koutraki, Maria}}, issn = {{1613-0073}}, keywords = {{Detection of Privacy Violations, Physician Reviews}}, location = {{Vienna, Austria}}, publisher = {{CEUR-WS.org}}, title = {{{Towards a Multi-Stage Approach to Detect Privacy Breaches in Physician Reviews}}}, volume = {{2198}}, year = {{2018}}, } @inproceedings{44, abstract = {{Natural language software requirements descriptions enable end users to formulate their wishes and expectations for a future software product without much prior knowledge in requirements engineering. However, these descriptions are susceptible to linguistic inaccuracies such as ambiguities and incompleteness that can harm the development process. There is a number of software solutions that can detect deficits in requirements descriptions and partially solve them, but they are often hard to use and not suitable for end users. For this reason, we develop a software system that helps end-users to create unambiguous and complete requirements descriptions by combining existing expert tools and controlling them using automatic compensation strategies. In order to recognize the necessity of individual compensation methods in the descriptions, we have developed linguistic indicators, which we present in this paper. Based on these indicators, the whole text analysis pipeline is ad-hoc configured and thus adapted to the individual circumstances of a requirements description.}}, author = {{Bäumer, Frederik Simon and Geierhos, Michaela}}, booktitle = {{Proceedings of the 51st Hawaii International Conference on System Sciences}}, isbn = {{978-0-9981331-1-9}}, keywords = {{Software Product Lines: Engineering, Services, and Management, Ambiguities, Incompleteness, Natural Language Processing, Software Requirements}}, location = {{Big Island, Waikoloa Village}}, pages = {{5746--5755}}, title = {{{Flexible Ambiguity Resolution and Incompleteness Detection in Requirements Descriptions via an Indicator-based Configuration of Text Analysis Pipelines}}}, doi = {{10125/50609}}, year = {{2018}}, }