@article{21067, abstract = {Acoustic waves in plates have proven a viable tool for testing and material characterisation purposes. There are a multitude of options for excitation and detection of theses waves, such as optical and piezoelectric systems. While optical systems, with thermoelastic excitation and interferometric detection, have the benefit of being contactless, they usually require rather complex and expensive experimental setups. Piezoelectric systems are more easily realised but require direct contact with the specimen and usually have a limited bandwidth, especially in case of piezoelectric excitation. In this work, the authors compare the properties of piezoelectric and optical detection methods for broad-band acoustic signals. The shape (e. g. the displacement) of a propagating plate wave is given by its frequency and wave number, allowing to investigate correlations between mode shapes and received signal strengths. This is aided by evaluations in normalised frequency and wavenumber space, facilitating comparisons of different specimens. Further, the authors explore possibilities to utilise the specific properties of the detection methods to determine acoustic material parameters.}, author = {Claes, Leander and Schmiegel, Hanna and Grünsteidl, Clemens and Johannesmann, Sarah and Webersen, Manuel and Henning, Bernd}, issn = {2196-7113}, journal = {tm - Technisches Messen}, number = {3}, pages = {147--155}, title = {{Investigating peculiarities of piezoelectric detection methods for acoustic plate waves in material characterisation applications}}, doi = {10.1515/teme-2020-0098}, volume = {88}, year = {2021}, } @article{21295, author = {Mirbabaie, Milad and Stieglitz, Stefan and Amojo, Ireti}, journal = {Journal of Database Management}, title = {{Affording Technology in Crisis Situations: The Occurrence of Rumor Sense-Making Processes}}, year = {2021}, } @inproceedings{20540, author = {Jovanovikj, Ivan and Thottam, Anu Tony and Joseph Vincent, Vishal and Yigitbas, Enes and Sauer, Stefan and Engels, Gregor}, booktitle = {Proceedings of the 9th International Conference on Model-Driven Engineering and Software Development }, location = {Vienna}, pages = {232--239}, publisher = {SCITEPRESS}, title = {{A Modeling Workbench for the Development of Situation-specific Test Co-Migration Methods }}, year = {2021}, } @inproceedings{21543, abstract = {Services often consist of multiple chained components such as microservices in a service mesh, or machine learning functions in a pipeline. Providing these services requires online coordination including scaling the service, placing instance of all components in the network, scheduling traffic to these instances, and routing traffic through the network. Optimized service coordination is still a hard problem due to many influencing factors such as rapidly arriving user demands and limited node and link capacity. Existing approaches to solve the problem are often built on rigid models and assumptions, tailored to specific scenarios. If the scenario changes and the assumptions no longer hold, they easily break and require manual adjustments by experts. Novel self-learning approaches using deep reinforcement learning (DRL) are promising but still have limitations as they only address simplified versions of the problem and are typically centralized and thus do not scale to practical large-scale networks. To address these issues, we propose a distributed self-learning service coordination approach using DRL. After centralized training, we deploy a distributed DRL agent at each node in the network, making fast coordination decisions locally in parallel with the other nodes. Each agent only observes its direct neighbors and does not need global knowledge. Hence, our approach scales independently from the size of the network. In our extensive evaluation using real-world network topologies and traffic traces, we show that our proposed approach outperforms a state-of-the-art conventional heuristic as well as a centralized DRL approach (60% higher throughput on average) while requiring less time per online decision (1 ms).}, author = {Schneider, Stefan Balthasar and Qarawlus, Haydar and Karl, Holger}, booktitle = {IEEE International Conference on Distributed Computing Systems (ICDCS)}, keyword = {network management, service management, coordination, reinforcement learning, distributed}, location = {Washington, DC, USA}, publisher = {IEEE}, title = {{Distributed Online Service Coordination Using Deep Reinforcement Learning}}, year = {2021}, } @inproceedings{21574, author = {Wecker, Christian and Schulz, Andreas and Heine, Jens and Bart, Hans-Jörg and Kenig, Eugeny}, publisher = {Jahrestreffen der ProcessNet-Fachgruppe Extraktion}, title = {{Numerische Untersuchung der Marangonikonvektion in Flüssig-Flüssig-Systemen: Von der Tropfenbildung bis zur Tropfeninteraktion}}, year = {2021}, } @misc{21233, author = {Schulze, Veronika and Schmidt, Stephan and Jurgelucks, Benjamin and Feldmann, Nadine and Claes, Leander}, title = {{Optimal experiment design with respect to electrode configurations for a piezoelectric problem}}, year = {2021}, } @inproceedings{21593, author = {Yigitbas, Enes and Jovanovikj, Ivan and Engels, Gregor}, booktitle = {Proceedings of the 18th IFIP TC13 International Conference on Human-Computer Interaction (INTERACT 2021) (to appear)}, publisher = {Springer}, title = {{Simplifying Robot Programming using Augmented Reality and End-User Development}}, year = {2021}, } @article{21598, author = {Schubert, Philipp and Hermann, Ben and Bodden, Eric}, journal = {European Conference on Object-Oriented Programming (ECOOP)}, title = {{Lossless, Persisted Summarization of Static Callgraph, Points-To and Data-Flow Analysis}}, year = {2021}, } @misc{21601, abstract = {The invention describes a distributed merchandise management system, in which the client, retailer and the manufacturer are linked by a network. This is implemented by a cloud storage (105), the cloud storage (105) comprising a means (105 a) for storing data, a means for receiving first data from a first network node (110), the first data being associated with a physical object, a means for receiving request data from a second network node (120), a means for receiving second data from a third network node (130), the second data being associated with the first data and comprising at least one data piece adapted to change the first data depending on the received request data, a means for changing the first data based at least in part on the second data and the request data, and a means for sending a changed portion of the first data from the cloud storage (105) to the first network node (110).}, author = {Göllner, Thomas and Schwarz, Jan-Hendrik and Gottschalk, Sebastian and Sauer, Stefan}, title = {{Distributed merchandise management system}}, year = {2021}, } @book{21276, abstract = {This collection of essays presents new work on women’s contribution to philosophy between the Renaissance and the mid-eighteenth century. They bring a new perspective to the history of philosophy, by highlighting women’s contributions to philosophy and testifying to the rich history of women’s thought in this period. By showing that women were active in many branches of philosophy (metaphysics, science, political philosophy cosmology, ontology, epistemology) the book testifies to the rich history of women’s thought across Europe in this period. The scope of the collection is international, both in terms of the philosophers represented and the contributors themselves from Britain and North America, but also from continental Europe and from as far afield as Australia and Brazil. The philosophers discussed here include both figures who have recently come to be better known (Elisabeth of Bohemia, Anne Conway, Mary Astell, Catharine Trotter Cockburn, Emilie du Châtelet), and less familiar figures (Moderata Fonte, Lucrezia Marinella Arcangela Tarabotti, Tullia d’Aragona, Madame Deshoulières, Madame de Sablé, Angélique de Saint-Jean Arnauld d’Andilly, Olivia Sabuco, Susanna Newcome). The chapters in this book were originally published as a special issue of the British Journal for the History of Philosophy.}, editor = {Hagengruber, Ruth and Hutton, Sarah}, isbn = {ISBN 9780367758646}, keyword = {History of Women Philosophers, Methodology, History of Philosophy, Women's Studies, Gender History}, publisher = {Routledge}, title = {{Women Philosophers from the Renaissance to the Enlightenment}}, year = {2021}, } @inproceedings{21637, author = {Lienen, Julian and Hüllermeier, Eyke}, booktitle = {Proceedings of the 35th AAAI Conference on Artificial Intelligence, AAAI}, location = {Online}, publisher = {AAAI Press}, title = {{From Label Smoothing to Label Relaxation}}, year = {2021}, } @inproceedings{21175, author = {Kappe, Fabian and Bielak, Christian Roman and Sartisson, Vadim and Bobbert, Mathias and Meschut, Gerson}, location = {Lüttich }, title = {{Influence of rivet length on joint formation on self-piercing riveting process considering further process parameters}}, year = {2021}, } @inproceedings{21707, author = {Yigitbas, Enes and Sauer, Stefan and Engels, Gregor}, booktitle = {Proceedings of the 13th ACM SIGCHI Symposium on Engineering Interactive Computing Systems (EICS 2021) (to appear)}, publisher = {ACM}, title = {{Using Augmented Reality for Enhancing Planning and Measurements in the Scaffolding Business}}, year = {2021}, } @misc{21714, author = {Wittmann, Daniel}, title = {{Interdependente Geschäftsmodelle: Eine systematische Analyse von Relationen in Geschäftsmodell-Modellierungssprachen}}, year = {2021}, } @misc{21721, author = {Tiggemann, Benjamin}, title = {{Innovation in Nutzerkommentaren – Eine Analyse am Beispiel einer Rezept-Plattform}}, year = {2021}, } @inproceedings{21726, author = {Triebus, Marcel and Tröster, Thomas}, booktitle = {9th NRW Nano Conference - Innovations in Materials and Applications}, location = {Web}, title = {{HyOpt - Optimization-Based Development of Hybrid Materials}}, year = {2021}, } @article{21810, author = {Otroshi, Mortaza and Meschut, Gerson and Bielak, Christian Roman and Masendorf, Lukas and Esderts, Alfons}, issn = {1662-9795}, journal = {Key Engineering Materials}, pages = {35--40}, publisher = {Trans Tech Publications Ltd}, title = {{Modeling of Stiffness Anisotropy in Simulation of Self-Piercing Riveted Components}}, doi = {https://doi.org/10.4028/www.scientific.net/KEM.883.35}, volume = {883}, year = {2021}, } @article{21808, abstract = {Modern services consist of interconnected components,e.g., microservices in a service mesh or machine learning functions in a pipeline. These services can scale and run across multiple network nodes on demand. To process incoming traffic, service components have to be instantiated and traffic assigned to these instances, taking capacities, changing demands, and Quality of Service (QoS) requirements into account. This challenge is usually solved with custom approaches designed by experts. While this typically works well for the considered scenario, the models often rely on unrealistic assumptions or on knowledge that is not available in practice (e.g., a priori knowledge). We propose DeepCoord, a novel deep reinforcement learning approach that learns how to best coordinate services and is geared towards realistic assumptions. It interacts with the network and relies on available, possibly delayed monitoring information. Rather than defining a complex model or an algorithm on how to achieve an objective, our model-free approach adapts to various objectives and traffic patterns. An agent is trained offline without expert knowledge and then applied online with minimal overhead. Compared to a state-of-the-art heuristic, DeepCoord significantly improves flow throughput (up to 76%) and overall network utility (more than 2x) on realworld network topologies and traffic traces. It also supports optimizing multiple, possibly competing objectives, learns to respect QoS requirements, generalizes to scenarios with unseen, stochastic traffic, and scales to large real-world networks. For reproducibility and reuse, our code is publicly available.}, author = {Schneider, Stefan Balthasar and Khalili, Ramin and Manzoor, Adnan and Qarawlus, Haydar and Schellenberg, Rafael and Karl, Holger and Hecker, Artur}, journal = {Transactions on Network and Service Management}, keyword = {network management, service management, coordination, reinforcement learning, self-learning, self-adaptation, multi-objective}, publisher = {IEEE}, title = {{Self-Learning Multi-Objective Service Coordination Using Deep Reinforcement Learning}}, doi = {10.1109/TNSM.2021.3076503}, year = {2021}, } @article{21815, abstract = {Sowohl Berufsethos als auch Berufswahlmotivation tragen zu relevanten lern-, leistungs- und laufbahnbedingenden Prozessen eines Individuums bei und prägen dessen Lebensverlauf wesentlich. Während die Berufswahlmotivation bereits verstärkt im wirtschaftspädagogischen Kontext untersucht wurde, existieren zum Berufsethos von Wirtschaftspädagog*innen nur vereinzelt empirische Studien. So ist beispielsweise wenig darüber bekannt, wie das Berufsethos von Wirtschaftspädagog*innen in der Ausbildungsphase ausgeprägt ist. Auch die Erforschung des Zusammenhangs zwischen den Konstrukten des Berufsethos und der Berufswahlmotivation blieb bisher unbeachtet. In diesem Beitrag wird entsprechend dieses Forschungsdesiderats untersucht, wie das anfänglich ausgebildete Berufsethos von Wirtschaftspädagogikstudierenden in der universitären Ausbildung ausgeprägt ist, ob sich die Ausprägung nach dem angegebenen Berufswunsch der Studierenden unterscheidet und inwiefern das anfänglich ausgeprägte Berufsethos mit der Berufswahlmotivation von Studierenden zusammenhängt. Dafür wurden im Wintersemester 2019/20 an zwölf deutschen Universitäten insgesamt 879 Wirtschaftspädagogikstudierende schriftlich befragt. Die Ergebnisse zeigen, dass das anfängliche Berufsethos der Befragten bereits in der universitären Ausbildungsphase relativ stark ausgeprägt ist. Weiterhin ist zu erkennen, dass das Berufsethos bei angehenden Wirtschaftspädagog*innen, die den Berufswunsch Lehrkraft haben, ausgeprägter ist als bei Wirtschaftspädagogikstudierenden, die eine Tätigkeit außerhalb des Schuldienstes anstreben bzw. noch unentschlossen sind. Letztlich kann aufgezeigt werden, dass grundsätzlich positive Zusammenhänge zwischen dem anfänglich ausgeprägten Berufsethos und der Berufswahlmotivation von angehenden Wirtschaftspädagog*innen bestehen.}, author = {Goller, Michael and Ziegler, Simone}, issn = {1618-8543}, journal = {bwp@ Spezial}, keyword = {Berufsethos, Berufswahlmotivation, Wirtschaftspädagogik, Studierende}, pages = {1--28}, title = {{Zum Zusammenhang von Berufsethos und der Berufswahlmotivation angehender Wirtschaftspädagog*innen}}, volume = {18}, year = {2021}, } @article{21827, author = {Klopp, Antje and Steffen, Eckhard}, issn = {0911-0119}, journal = {Graphs and Combinatorics}, pages = {559--580}, title = {{Fractional Matchings, Component-Factors and Edge-Chromatic Critical Graphs}}, doi = {10.1007/s00373-020-02266-6}, year = {2021}, } @article{21954, author = {Lanza, Lukas Johannes}, issn = {0167-6911}, journal = {Systems & Control Letters}, title = {{Internal dynamics of multibody systems}}, doi = {10.1016/j.sysconle.2021.104931}, year = {2021}, } @article{22003, abstract = {AbstractThe coherent electron spin dynamics of an ensemble of singly charged (In,Ga)As/GaAs quantum dots in a transverse magnetic field is driven by periodic optical excitation at 1 GHz repetition frequency. Despite the strong inhomogeneity of the electron g factor, the spectral spread of optical transitions, and the broad distribution of nuclear spin fluctuations, we are able to push the whole ensemble of excited spins into a single Larmor precession mode that is commensurate with the laser repetition frequency. Furthermore, we demonstrate that an optical detuning of the pump pulses from the probed optical transitions induces a directed dynamic nuclear polarization and leads to a discretization of the total magnetic field acting on the electron ensemble. Finally, we show that the highly periodic optical excitation can be used as universal tool for strongly reducing the nuclear spin fluctuations and preparation of a robust nuclear environment for subsequent manipulation of the electron spins, also at varying operation frequencies.}, author = {Evers, E. and Kopteva, N. E. and Yugova, I. A. and Yakovlev, D. R. and Reuter, Dirk and Wieck, A. D. and Bayer, M. and Greilich, A.}, issn = {2056-6387}, journal = {npj Quantum Information}, title = {{Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation}}, doi = {10.1038/s41534-021-00395-1}, year = {2021}, } @article{22010, author = {Aldahhak, Hazem and Hogan, Conor and Lindner, Susi and Appelfeller, Stephan and Eisele, Holger and Schmidt, Wolf Gero and Dähne, Mario and Gerstmann, Uwe and Franz, Martin}, issn = {2469-9950}, journal = {Physical Review B}, title = {{Electronic structure of the Si(111)3×3R30∘−B surface from theory and photoemission spectroscopy}}, doi = {10.1103/physrevb.103.035303}, year = {2021}, } @article{22008, author = {Plaickner, Julian and Speiser, Eugen and Braun, Christian and Schmidt, Wolf Gero and Esser, Norbert and Sanna, Simone}, issn = {2469-9950}, journal = {Physical Review B}, title = {{Surface localized phonon modes at the Si(553)-Au nanowire system}}, doi = {10.1103/physrevb.103.115441}, year = {2021}, } @inproceedings{22159, author = {Barrow, Joe and Jain, Rajiv and Lipka, Nedim and Dernoncourt, Franck and Morariu, Vlad and Manjunatha, Varun and Oard, Douglas and Resnik, Philip 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)}, title = {{Syntopical Graphs for Computational Argumentation Tasks}}, year = {2021}, } @inproceedings{20115, author = {Skitalinskaya, Gabriella and Klaff, Jonas and Wachsmuth, Henning}, booktitle = {Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics}, pages = {1718--1729}, title = {{Learning From Revisions: Quality Assessment of Claims in Argumentation at Scale}}, year = {2021}, } @article{22205, abstract = {In January 2021, the GameStop stock was the epicenter of the first case of predatory trading initiated by retail investors. We use brokerage accounts to study who participated in this GameStop frenzy and how they performed. We investigate the extent to which investors’ personal and trading characteristics differ from the general population of retail investors. GameStop traders had a history of investing in speculative instruments, including stocks with lottery-like features. They were also more likely to close their positions before the peak of the bubble. At the onset of the frenzy, numerous retail investors also shorted GameStop. Overall, our results indicate that the GameStop frenzy was not a pure digital protest against Wall Street but speculative trading by a group of retail investors, in line with their prior high-risk trading behavior.}, author = {Hasso, Tim and Müller, Daniel and Pelster, Matthias and Warkulat, Sonja}, journal = {Finance Research Letters}, keyword = {Predatory Trading, Retail Investors, Trading Behavior}, title = {{Who participated in the GameStop frenzy? Evidence from brokerage accounts}}, year = {2021}, } @book{18748, author = {Büker, Petra and Hüpping, Birgit}, publisher = {Kohlhammer}, title = {{Kulturelle Vielfalt. Kinderstärkende Pädagogik}}, volume = {8}, year = {2021}, } @article{13445, author = {Steffen, Eckhard and Vogel, Alexander}, journal = {European J. Combinatorics}, title = {{Concepts of signed graph coloring}}, volume = {91}, year = {2021}, } @article{20212, abstract = {Ideational impact refers to the uptake of a paper's ideas and concepts by subsequent research. It is defined in stark contrast to total citation impact, a measure predominantly used in research evaluation that assumes that all citations are equal. Understanding ideational impact is critical for evaluating research impact and understanding how scientific disciplines build a cumulative tradition. Research has only recently developed automated citation classification techniques to distinguish between different types of citations and generally does not emphasize the conceptual content of the citations and its ideational impact. To address this problem, we develop Deep Content-enriched Ideational Impact Classification (Deep-CENIC) as the first automated approach for ideational impact classification to support researchers' literature search practices. We evaluate Deep-CENIC on 1,256 papers citing 24 information systems review articles from the IT business value domain. We show that Deep-CENIC significantly outperforms state-of-the-art benchmark models. We contribute to information systems research by operationalizing the concept of ideational impact, designing a recommender system for academic papers based on deep learning techniques, and empirically exploring the ideational impact of the IT business value domain. }, author = {Prester, Julian and Wagner, Gerit and Schryen, Guido and Hassan, Nik Rushdi}, journal = {Decision Support Systems}, keyword = {Ideational impact, citation classification, academic recommender systems, natural language processing, deep learning, cumulative tradition}, title = {{Classifying the Ideational Impact of Information Systems Review Articles: A Content-Enriched Deep Learning Approach}}, year = {2021}, } @article{20844, abstract = {Review papers are essential for knowledge development in IS. While some are cited twice a day, others accumulate single digit citations over a decade. The magnitude of these differences prompts us to analyze what distinguishes those reviews that have proven to be integral to scientific progress from those that might be considered less impactful. Our results highlight differences between reviews aimed at describing, understanding, explaining, and theory testing. Beyond the control variables, they demonstrate the importance of methodological transparency and the development of research agendas. These insights inform all stakeholders involved in the development and publication of review papers.}, author = {Wagner, Gerit and Prester, Julian and Roche, Maria and Schryen, Guido and Benlian, Alexander and Paré, Guy and Templier, Mathieu}, journal = {Information & Management}, keyword = {Literature review, review papers, scientometric, scientific impact, citation analysis}, title = {{Which Factors Affect the Scientific Impact of Review Papers in IS Research? A Scientometric Study}}, year = {2021}, } @article{20921, author = {Paul, Andreas and Baumhögger, Elmar and Elsner, Andreas and Moczarski, Lukas and Reineke, Michael and Sonnenrein, Gerrit and Hueppe, Christian and Stamminger, Rainer and Hoelscher, Heike and Wagner, Hendrik and Gries, Ulrich and Freiberger, Alfred and Becker, Wolfgang and Vrabec, Jadran}, issn = {0140-7007}, journal = {International Journal of Refrigeration}, pages = {235--242}, title = {{Determining the heat flow through the cabinet walls of household refrigerating appliances}}, doi = {10.1016/j.ijrefrig.2020.10.007}, year = {2021}, } @article{21020, author = {Ansari, Vahid and Brecht, Benjamin and Gil-Lopez, Jano and Donohue, John M. and Řeháček, Jaroslav and Hradil, Zdeněk and Sánchez-Soto, Luis L. and Silberhorn, Christine}, issn = {2691-3399}, journal = {PRX Quantum}, title = {{Achieving the Ultimate Quantum Timing Resolution}}, doi = {10.1103/prxquantum.2.010301}, volume = {2}, year = {2021}, } @article{21082, author = {Itner, Dominik and Gravenkamp, Hauke and Dreiling, Dmitrij and Feldmann, Nadine and Henning, Bernd}, issn = {1617-7061}, journal = {PAMM}, title = {{Simulation of guided waves in cylinders subject to arbitrary boundary conditions for applications in material characterization}}, doi = {10.1002/pamm.202000232}, year = {2021}, } @article{21094, author = {Aldahhak, Hazem and Hogan, Conor and Lindner, Susi and Appelfeller, Stephan and Eisele, Holger and Schmidt, Wolf Gero and Dähne, Mario and Gerstmann, Uwe and Franz, Martin}, issn = {2469-9950}, journal = {Physical Review B}, title = {{Electronic structure of the Si(111)3×3R30°−B surface from theory and photoemission spectroscopy}}, doi = {10.1103/physrevb.103.035303}, year = {2021}, } @phdthesis{21183, abstract = {Die präzise Kenntnis der Eigenschaften verwendeter Materialien hat große Bedeutung für den Entwurf technischer Systeme aller Art, aber auch für die Überwachung solcher Systeme im Betrieb. Für verschiedene physikalische Eigenschaften, Betriebsbedingungen und Materialklassen werden daher geeignete messtechnische Verfahren zur Materialcharakterisierung benötigt. In der vorliegenden Arbeit wird ein Verfahren zur ultraschallbasierten Charakterisierung der mechanischen Eigenschaften von homogenen und faserverstärkten thermoplastischen Polymeren unter Berücksichtigung der Richtungsabhängigkeit vorgestellt. Plattenförmige Probekörper werden dazu mittels Laser-Pulsen hoher Energie breitbandig angeregt und die resultierenden akustischen Lamb-Wellen aufgezeichnet. Auf Basis der dispersiven Eigenschaften der detektierten Wellenleitermoden werden in einem inversen Verfahren die Parameter eines linear-elastischen Materialmodells identifiziert. Darüber hinaus wird ein Verfahren zur vollständigen Charakterisierung der Richtungsabhängigkeit in orthotropen Materialien wie Faserverbundwerkstoffen unter Verwendung eines zweidimensionalen Simulationsmodells vorgestellt. Das Messverfahren wird anhand einer Untersuchungsreihe an künstlich gealterten Polymer- und Faserverbundwerkstoffen verifiziert und die Übertragbarkeit der Ergebnisse auf den quasistatischen Fall betrachtet. Im Vergleich mit den Ergebnissen mechanischer Zugversuche werden die Voraussetzungen und Einschränkungen, insbesondere durch die Annahme eines ideal-elastischen Materialmodells, diskutiert.}, author = {Webersen, Manuel}, publisher = {Universitätsbibliothek Paderborn}, title = {{Zerstörungsfreie Charakterisierung der elastischen Materialeigenschaften thermoplastischer Polymerwerkstoffe mittels Ultraschall}}, doi = {10.17619/UNIPB/1-1088}, year = {2021}, } @misc{21203, author = {Schlesiger, Laura}, title = {{Determinants of Loyalty in Online Communities: A Systematic Literature Review}}, year = {2021}, } @article{21208, abstract = {Heterogeneous platforms with FPGAs have started to be employed in the High-Performance Computing (HPC) field to improve performance and overall efficiency. These platforms allow the use of specialized hardware to accelerate software applications, but require the software to be adapted in what can be a prolonged and complex process. The main goal of this work is to describe and evaluate mechanisms that can transparently transfer the control flow between CPU and FPGA within the scope of HPC. Combining such a mechanism with transparent software profiling and accelerator configuration could lead to an automatic way of accelerating regular applications. In this work, a mechanism based on the ptrace system call is proposed, and its performance on the Intel Xeon+FPGA platform is evaluated. The feasibility of the proposed approach is demonstrated by a working prototype that performs the transparent control flow transfer of any function call to a matching hardware accelerator. This approach is more general than shared library interposition at the cost of a small time overhead in each accelerator use (about 1.3ms in the prototype implementation).}, author = {Granhão, Daniel and Canas Ferreira, João Canas}, issn = {2079-9292}, journal = {Electronics}, keyword = {pc2-ressources-harp}, title = {{Transparent Control Flow Transfer between CPU and Accelerators for HPC}}, doi = {10.3390/electronics10040406}, year = {2021}, } @inproceedings{21258, author = {Franke, Mario and Klingler, Florian}, booktitle = {40th IEEE International Conference on Computer Communications (INFOCOM 2021), Poster Session}, publisher = {IEEE}, title = {{HiL meets Commodity Hardware -- SimbaR for coupling IEEE 802.11 Radio Channels}}, year = {2021}, } @article{21265, abstract = {Fast-growing energy demand of the world makes the researchers focus on finding new energy sources or optimizing already-developed approaches. For an efficient use of solar and wind energy in an energy system, correct design and sizing of a power system is of high importance and improving or optimizing the process of data obtaining for this purpose leads to higher performance and lower cost per unit of energy. It is essential to have the most precise possible estimation of solar and wind energy potential and other local weather parameters in order to fully feed the demand and avoid extra costs. There are various methods for obtaining local data, such as local measurements, official organizational data, satellite obtained, and reanalysis data. In this paper, the Modern-Era Retrospective analysis for Research and Applications dataset version 2 (MERRA-2) dataset provided by NASA is introduced and its performance is evaluated by comparison to various locally measured datasets offered by meteorological institutions such as Meteonorm and Deutscher Wetterdienst (DWD, or Germany’s National Meteorological Service) around the world. After comparison, correlation coefficients from 0.95 to 0.99 are observed for monthly global horizontal irradiance values. In the case of air temperature, correlation coefficients of 0.99 and for wind speed from 0.81 to 0.99 are observed. High correlation with ground measurements and relatively low errors are confirmed, especially for irradiance and temperature values, that makes MERRA-2 a valuable dataset, considering its world coverage and availability.}, author = {Khatibi, Arash and Krauter, Stefan}, issn = {1996-1073}, journal = {Energies}, title = {{Validation and Performance of Satellite Meteorological Dataset MERRA-2 for Solar and Wind Applications}}, doi = {10.3390/en14040882}, year = {2021}, } @inproceedings{21378, author = {Hartel, Rita and Dunst, Alexander}, booktitle = {MANPU 2020: The 4th International Workshop on coMics ANalysis, Processing and Understanding@Pattern Recognition. ICPR International Workshops and Challenges}, isbn = {9783030687793}, issn = {0302-9743}, title = {{An OCR Pipeline and Semantic Text Analysis for Comics}}, doi = {10.1007/978-3-030-68780-9_19}, year = {2021}, } @article{16867, abstract = {In this article, we present an efficient descent method for locally Lipschitz continuous multiobjective optimization problems (MOPs). The method is realized by combining a theoretical result regarding the computation of descent directions for nonsmooth MOPs with a practical method to approximate the subdifferentials of the objective functions. We show convergence to points which satisfy a necessary condition for Pareto optimality. Using a set of test problems, we compare our method to the multiobjective proximal bundle method by M\"akel\"a. The results indicate that our method is competitive while being easier to implement. While the number of objective function evaluations is larger, the overall number of subgradient evaluations is lower. Finally, we show that our method can be combined with a subdivision algorithm to compute entire Pareto sets of nonsmooth MOPs.}, author = {Gebken, Bennet and Peitz, Sebastian}, journal = {Journal of Optimization Theory and Applications}, pages = {696--723}, title = {{An efficient descent method for locally Lipschitz multiobjective optimization problems}}, doi = {10.1007/s10957-020-01803-w}, volume = {188}, year = {2021}, } @article{21195, author = {Goelz, Christian and Mora, Karin and Stroehlein, Julia Kristin and Haase, Franziska Katharina and Dellnitz, Michael and Reinsberger, Claus and Vieluf, Solveig}, journal = {Cognitive Neurodynamics}, title = {{Electrophysiological signatures of dedifferentiation differ between fit and less fit older adults}}, doi = {10.1007/s11571-020-09656-9}, year = {2021}, } @inproceedings{21431, author = {Chudalla, Nick and Meschut, Gerson and Bartley, Aurélie and Wibbeke, Tim Michael}, booktitle = {21. Kolloquium: Gemeinsame Forschung in der Klebtechnik}, title = {{Analyse des Versagensverhaltens geklebter Stahl Verbindungen beim werkstoffschonenden Entfügen in der Karosserieinstandsetzung}}, year = {2021}, } @article{21284, author = {Mirbabaie, Milad and Stieglitz, S. and Frick, N.}, journal = {Electronic Markets}, title = {{Hybrid Intelligence in Hospitals: Towards a Research Agenda for Collaboration and Team-Building}}, year = {2021}, } @article{21296, author = {Mirbabaie, Milad and Stieglitz, S. and Brünker, F. and Hofeditz, L. and Ross, B. and Frick, N.R.J.}, journal = {Business & Information Systems Engineering }, title = {{Understanding Collaboration with Virtual Assistants – The Role of Social Identity and Extended Self}}, year = {2021}, } @inproceedings{21479, abstract = {Two of the most important metrics when developing Wireless Sensor Networks (WSNs) applications are the Quality of Information (QoI) and Quality of Service (QoS). The former is used to specify the quality of the collected data by the sensors (e.g., measurements error or signal's intensity), while the latter defines the network's performance and availability (e.g., packet losses and latency). In this paper, we consider an example of wireless acoustic sensor networks, where we select a subset of microphones for two different objectives. First, we maximize the recording quality under QoS constraints. Second, we apply a trade-off between QoI and QoS. We formulate the problem as a constrained Markov Decision Problem (MDP) and solve it using reinforcement learning (RL). We compare the RL solution to a baseline model and show that in case of QoS-guarantee objective, the RL solution has an optimality gap up to 1\%. Meanwhile, the RL solution is better than the baseline with improvements up to 23\%, when using the trade-off objective.}, author = {Afifi, Haitham and Ramaswamy, Arunselvan and Karl, Holger}, booktitle = {2021 IEEE 18th Annual Consumer Communications \& Networking Conference (CCNC) (CCNC 2021)}, keyword = {reinforcement learning, wireless sensor networks, resource allocation, acoustic sensor networks}, title = {{A Reinforcement Learning QoI/QoS-Aware Approach in Acoustic Sensor Networks}}, year = {2021}, } @inproceedings{21525, author = {Gutt, Dominik and Neumann, Jürgen and Jabr, Wael and Kundisch, Dennis}, location = {Virtual Conference/Workshop}, title = {{The Fate of the App: Economic Implications of Updating under Reputation Resetting}}, year = {2021}, } @article{21532, author = {Görzen, Thomas}, journal = {International Journal of Innovation Management}, number = {1}, title = {{“What’s the Point of the Task?” Exploring the Influence of Task Meaning on Creativity in Crowdsourcing}}, doi = {10.1142/S1363919621500079}, volume = {25}, year = {2021}, } @article{21556, author = {Brosch, Anian and Wallscheid, Oliver and Boecker, Joachim}, issn = {2644-1241}, journal = {IEEE Open Journal of Industry Applications}, pages = {1--1}, title = {{Model Predictive Control of Permanent Magnet Synchronous Motors in the Overmodulation Region Including Six-Step Operation}}, doi = {10.1109/ojia.2021.3066105}, year = {2021}, } @inproceedings{21575, author = {Wecker, Christian and Hoppe, Anna and Schulz, Andreas and Heine, Jens and Bart, Hans-Jörg and Kenig, Eugeny}, publisher = {Jahrestreffen der ProcessNet-Fachgruppe Wärme- und Stofftransport}, title = {{Numerische Untersuchungen zu Fluiddynamik und Stofftransport binärer Tropfeninteraktion unter Berücksichtigung von Marangonikonvektion}}, year = {2021}, } @inbook{21587, abstract = {Solving partial differential equations on unstructured grids is a cornerstone of engineering and scientific computing. Nowadays, heterogeneous parallel platforms with CPUs, GPUs, and FPGAs enable energy-efficient and computationally demanding simulations. We developed the HighPerMeshes C++-embedded Domain-Specific Language (DSL) for bridging the abstraction gap between the mathematical and algorithmic formulation of mesh-based algorithms for PDE problems on the one hand and an increasing number of heterogeneous platforms with their different parallel programming and runtime models on the other hand. Thus, the HighPerMeshes DSL aims at higher productivity in the code development process for multiple target platforms. We introduce the concepts as well as the basic structure of the HighPerMeshes DSL, and demonstrate its usage with three examples, a Poisson and monodomain problem, respectively, solved by the continuous finite element method, and the discontinuous Galerkin method for Maxwell’s equation. The mapping of the abstract algorithmic description onto parallel hardware, including distributed memory compute clusters, is presented. Finally, the achievable performance and scalability are demonstrated for a typical example problem on a multi-core CPU cluster.}, author = {Alhaddad, Samer and Förstner, Jens and Groth, Stefan and Grünewald, Daniel and Grynko, Yevgen and Hannig, Frank and Kenter, Tobias and Pfreundt, Franz-Josef and Plessl, Christian and Schotte, Merlind and Steinke, Thomas and Teich, Jürgen and Weiser, Martin and Wende, Florian}, booktitle = {Euro-Par 2020: Parallel Processing Workshops}, isbn = {9783030715922}, issn = {0302-9743}, keyword = {tet_topic_hpc}, title = {{HighPerMeshes – A Domain-Specific Language for Numerical Algorithms on Unstructured Grids}}, doi = {10.1007/978-3-030-71593-9_15}, year = {2021}, } @article{21599, author = {Bonifacio, Rodrigo and Krüger, Stefan and Narasimhan, Krishna and Bodden, Eric and Mezini, Mira}, journal = {European Conference on Object-Oriented Programming (ECOOP)}, title = {{Dealing with Variability in API Misuse Specification}}, year = {2021}, } @inbook{21602, abstract = {Essential ideas significantly connected to humanism, Renaissance, and early modern philosophy stem from women’s pens. The supportive role of women in the early modern period has hardly been recognized up to today. The relevant issues women have contributed to range from commentaries on and critiques of the Bible, and their demands for equality and the critique of political institutions, topics that became eminent enhancers of political and societal change in the relevant period of early modern philosophy, to enlightenment philosophy. The experience of oppression allowed women to critically reflect epistemology and traditions. The claim on the truth of the subject’s selfexperience became a marker to rebut scholarly wisdom from the books that were seen as “filled with prejudice.” Women evaluated sources from antiquity, retracing their own legacies back to the figures of the ancient period. As a result, a number of listings of women’s traces can be found in that period, partly documentary, partly mythical. This sort of encyclopedic endeavor of retracing a tradition was in line with and even encouraged a tendency in that period to support women’s inclusion. Examples can be found from 1400–1750.}, author = {Hagengruber, Ruth Edith}, booktitle = {Encyclopedia of Early Modern Philosophy and the Sciences}, editor = {Jalobeanu, Dana and Wolfe , Charles }, isbn = {9783319207919}, publisher = {Springer}, title = {{Women in Early Modern Philosophy and Science: An Introduction}}, doi = {10.1007/978-3-319-20791-9_529-1}, year = {2021}, } @article{21436, abstract = {Ultrasonic wire bonding is a solid-state joining process, used in the electronics industry to form electrical connections, e.g. to connect electrical terminals within semiconductor modules. Many process parameters affect the bond strength, such like the bond normal force, ultrasonic power, wire material and bonding frequency. Today, process design, development, and optimization is most likely based on the knowledge of process engineers and is mainly performed by experimental testing. In this contribution, a newly developed simulation tool is presented, to reduce time and costs and efficiently determine optimized process parameter. Based on a co-simulation of MATLAB and ANSYS, the different physical phenomena of the wire bonding process are considered using finite element simulation for the complex plastic deformation of the wire and reduced order models for the transient dynamics of the transducer, wire, substrate and bond formation. The model parameters such as the coefficients of friction between bond tool and wire and between wire and substrate were determined for aluminium and copper wire in experiments with a test rig specially developed for the requirements of heavy wire bonding. To reduce simulation time, for the finite element simulation a restart analysis and high performance computing is utilized. Detailed analysis of the bond formation showed, that the normal pressure distribution in the contact between wire and substrate has high impact on bond formation and distribution of welded areas in the contact area.}, author = {Schemmel, Reinhard and Krieger, Viktor and Hemsel, Tobias and Sextro, Walter}, issn = {0026-2714}, journal = {Microelectronics Reliability}, keyword = {Ultrasonic heavy wire bonding, Co-simulation, ANSYS, MATLAB, Process optimization, Friction coefficient, Copper-copper, Aluminium-copper}, pages = {114077}, title = {{Co-simulation of MATLAB and ANSYS for ultrasonic wire bonding process optimization}}, doi = {https://doi.org/10.1016/j.microrel.2021.114077}, volume = {119}, year = {2021}, } @article{21549, author = {Kowatz, Jannik and Teutenberg, Dominik and Meschut, Gerson}, issn = {0143-7496}, journal = {International Journal of Adhesion and Adhesives}, keyword = {Epoxy adhesive, fatigue strength, shear, peel, Steel-CFRP joints}, publisher = {Elsevier}, title = {{Experimental failure analysis of adhesively bonded steel/CFRP joints under quasi-static and cyclic tensile-shear and peel loading}}, doi = {10.1016/j.ijadhadh.2021.102851}, year = {2021}, } @article{21633, abstract = {Higher quality requirements by customers demand higher precision and accuracy from manufacturing processes. Application oriented preparation of semi-finished materials is key for subsequent forming operations, therefore, straightening machines are employed. Straightening strengthens the material by increasing plastic deformation by means of strain hardening, resulting in undesirable reduction in formability when processing high strength materials, in particular. Conventional roll-type straightening machines process either bars or strips. This is achieved upon passing material between rolls arranged in two staggered rows. However, conventional straightening processes do not adapt to the local varying distortion of coiled strips. Innovative, self-correcting process control techniques, which adapt to the initial geometric characteristics of the strip, present a promising approach to fix this issue through optimization of the leveling process. Here, an innovative strategy to improve straightening of high strength steel materials (1.4310) is presented. This implements optimized leveling, adding minimal plastic deformation and, thus, strain hardening. To operate an intelligent straightening machine, a reliable online measurement of the surface defects is fundamentally essential. The MagnaTest, which is developed for material testing, is made feasible for such purposes after calibrating for curvature measurement. Preliminary results are promising in regards to measuring the curvature online, so that the following straightening process can be close loop controlled. The bending measurement is linked to open/closed loop control, therefore providing an optimal straightening result in regards to formability, leveling, and reduced strain hardening.}, author = {Bader, Fabian and Bathelt, Lukas and Djakow, Eugen and Homberg, Werner and Henke, Christian and Trächtler, Ansgar}, journal = {ESAFORM 2021}, title = {{Innovative Measurement Of Stress Superposed Steel Strip For Straightening Machines}}, doi = {10.25518/esaform21.2382}, year = {2021}, } @inproceedings{21176, author = {Kappe, Fabian and Bobbert, Mathias and Meschut, Gerson}, location = {Nürnberg}, title = {{New approach for versatile self piercing riveting: joining system and auxiliary part}}, year = {2021}, } @inproceedings{21811, abstract = {In order to reduce the fuel consumption and consequently the greenhouse emissions, the automotive industry is implementing lightweight constructions in the body in white production. As a result, the use of aluminum alloys is continuously increasing. Due to poor weldability of aluminum in combination with other materials, mechanical joining technologies like clinching are increasingly used. In order to predict relevant characteristics of clinched joints and to ensure the reliability of the process, it is simulated numerically during product development processes. In this regard the predictive accuracy of the simulated process highly depends on the implemented friction model. In particular, the frictional behavior between the sheet metals affects the geometrical formation of the clinched joint significantly. This paper presents a testing method, which enables to determine the frictional coefficients between sheet metal materials for the simulation of clinching processes. For this purpose, the correlation of interface pressure and the relative velocity between aluminum sheets in clinching processes is investigated using numerical simulation. Furthermore, the developed testing method focuses on the specimen geometry as well as the reproduction of the occurring friction conditions between two sheet metal materials in clinching processes. Based on a methodical approach the test setup is explained and the functionality of the method is proven by experimental tests using sheet metal material EN AW6014. }, author = {Rossel, Moritz Sebastian and Böhnke, Max and Bielak, Christian and Bobbert, Mathias and Meschut, Gerson}, booktitle = {Sheet Metal 2021}, keyword = {Tribology, Sheet Metal, Simulation}, pages = {81--88}, publisher = {Trans Tech Publications Ltd}, title = {{Development of a Method for the Identification of Friction Coefficients in Sheet Metal Materials for the Numerical Simulation of Clinching Processes}}, doi = {10.4028/www.scientific.net/KEM.883.81}, volume = {883}, year = {2021}, } @inproceedings{21828, author = {Wünderlich, Nancy and Flath, B. and Kundisch, Dennis and Matzner, T.}, booktitle = {Proceedings of the 21st International Conference on Cultural Economics, ACEI2020}, location = {Virtual Conference/Workshop}, title = {{Imposed Service Innovations in Music and Performing Arts Caused by COVID-19}}, year = {2021}, } @inproceedings{21727, abstract = {Platform-based business models underlie the success of many of today’s largest, fastest-growing, and most disruptive companies. Despite the success of prominent examples, such as Uber and Airbnb, creating a profitable platform ecosystem presents a key challenge for many companies across all industries. Although research provides knowledge about platforms’ different value drivers (e.g., network effects), companies that seek to transform their current business model into a platform-based one lack an artifact to reduce knowledge boundaries, collaborate effectively, and cope with the complexities and dynamics of platform ecosystems. We address this challenge by developing two artifacts and combining research from variability modeling, business model dependencies, and system dynamics. This paper presents a design science research approach to develop the platform ecosystem modeling language and the platform ecosystem development tool that support researcher and practitioner by visualizing and simulating platform ecosystems. }, author = {Vorbohle, Christian and Gottschalk, Sebastian}, booktitle = {Proceedings of the 29th European Conference on Information Systems (ECIS)}, keyword = {Platform Ecosystems, Platform Ecosystem Modeling Language, Platform Ecosystem Development Tool, Business Models, Design Science}, location = {Virtual Conference/Workshop}, publisher = {AIS}, title = {{Towards Visualizing and Simulating Business Models in Dynamic Platform Ecosystems (To Appear)}}, year = {2021}, } @article{22004, author = {Schall, Johannes and Deconinck, Marielle and Bart, Nikolai and Florian, Matthias and Helversen, Martin and Dangel, Christian and Schmidt, Ronny and Bremer, Lucas and Bopp, Frederik and Hüllen, Isabell and Gies, Christopher and Reuter, Dirk and Wieck, Andreas D. and Rodt, Sven and Finley, Jonathan J. and Jahnke, Frank and Ludwig, Arne and Reitzenstein, Stephan}, issn = {2511-9044}, journal = {Advanced Quantum Technologies}, title = {{Bright Electrically Controllable Quantum‐Dot‐Molecule Devices Fabricated by In Situ Electron‐Beam Lithography}}, doi = {10.1002/qute.202100002}, year = {2021}, } @article{21359, author = {Barkhausen, Franziska and Pukrop, Matthias and Schumacher, Stefan and Ma, Xuekai}, issn = {2469-9950}, journal = {Physical Review B}, number = {7}, title = {{Structuring coflowing and counterflowing currents of polariton condensates in concentric ring-shaped and elliptical potentials}}, doi = {10.1103/physrevb.103.075305}, volume = {103}, year = {2021}, } @article{22009, author = {Ruiz Alvarado, Isaac Azahel and Karmo, Marsel and Runge, Erich and Schmidt, Wolf Gero}, issn = {2470-1343}, journal = {ACS Omega}, pages = {6297--6304}, title = {{InP and AlInP(001)(2 × 4) Surface Oxidation from Density Functional Theory}}, doi = {10.1021/acsomega.0c06019}, year = {2021}, } @article{21823, author = {Han, Daxin and Yang, Keke and Meschut, Gerson}, issn = {0924-0136}, journal = {Journal of Materials Processing Technology}, title = {{Mechanical joining of glass fibre reinforced polymer (GFRP) through an innovative solid self-piercing rivet}}, doi = {10.1016/j.jmatprotec.2021.117182}, year = {2021}, } @article{21708, author = {Lenz, Peter and Mahnken, Rolf}, issn = {1617-7061}, journal = {PAMM}, title = {{Damage simulation of thermo‐chemo‐elasto‐plastic fibre reinforced composites using mean‐field homogenization methods}}, doi = {10.1002/pamm.202000265}, year = {2021}, } @inbook{22059, abstract = {Verifiable random functions (VRFs), introduced by Micali, Rabin and Vadhan (FOCS’99), are the public-key equivalent of pseudo- random functions. A public verification key and proofs accompanying the output enable all parties to verify the correctness of the output. How- ever, all known standard model VRFs have a reduction loss that is much worse than what one would expect from known optimal constructions of closely related primitives like unique signatures. We show that: 1. Every security proof for a VRF that relies on a non-interactive assumption has to lose a factor of Q, where Q is the number of adver- sarial queries. To that end, we extend the meta-reduction technique of Bader et al. (EUROCRYPT’16) to also cover VRFs. 2. This raises the question: Is this bound optimal? We answer this ques- tion in the affirmative by presenting the first VRF with a reduction from the non-interactive qDBDHI assumption to the security of VRF that achieves this optimal loss. We thus paint a complete picture of the achievability of tight verifiable random functions: We show that a security loss of Q is unavoidable and present the first construction that achieves this bound.}, author = {Niehues, David}, booktitle = {Public-Key Cryptography – PKC 2021}, isbn = {9783030752477}, issn = {0302-9743}, title = {{Verifiable Random Functions with Optimal Tightness}}, doi = {10.1007/978-3-030-75248-4_3}, year = {2021}, } @inproceedings{22155, author = {Gottschalk, Sebastian}, booktitle = {Advanced Software Engineering. Doctorial Consortium}, publisher = {CEUR}, title = {{Situation-specific Development of Business Models for Services in Software Ecosystems (To Appear)}}, year = {2021}, } @article{22162, author = {Book, Gerrit and Traue, Arne and Balakrishna, Praneeth and Brosch, Anian and Schenke, Maximilian and Hanke, Soren and Kirchgassner, Wilhelm and Wallscheid, Oliver}, issn = {2644-1314}, journal = {IEEE Open Journal of Power Electronics}, pages = {187--201}, title = {{Transferring Online Reinforcement Learning for Electric Motor Control From Simulation to Real-World Experiments}}, doi = {10.1109/ojpel.2021.3065877}, year = {2021}, } @inproceedings{20244, author = {Gottschalk, Sebastian and Kirchhoff, Jonas and Engels, Gregor}, booktitle = {Business Modeling and Software Design}, editor = {Shishkov, Boris}, location = {Sofia}, title = {{Extending Business Model Development Tools with Consolidated Expert Knowledge (To Appear)}}, year = {2021}, } @book{20446, author = {Neumann, Stefan and Meschut, Gerson and Schmatz, Frederik and Flügge, Wilko}, title = {{Robotergestütztes manuelles mechanisches Fügen – RoboterFügen}}, year = {2021}, } @inproceedings{20693, abstract = {In practical, large-scale networks, services are requested by users across the globe, e.g., for video streaming. Services consist of multiple interconnected components such as microservices in a service mesh. Coordinating these services requires scaling them according to continuously changing user demand, deploying instances at the edge close to their users, and routing traffic efficiently between users and connected instances. Network and service coordination is commonly addressed through centralized approaches, where a single coordinator knows everything and coordinates the entire network globally. While such centralized approaches can reach global optima, they do not scale to large, realistic networks. In contrast, distributed approaches scale well, but sacrifice solution quality due to their limited scope of knowledge and coordination decisions. To this end, we propose a hierarchical coordination approach that combines the good solution quality of centralized approaches with the scalability of distributed approaches. In doing so, we divide the network into multiple hierarchical domains and optimize coordination in a top-down manner. We compare our hierarchical with a centralized approach in an extensive evaluation on a real-world network topology. Our results indicate that hierarchical coordination can find close-to-optimal solutions in a fraction of the runtime of centralized approaches.}, author = {Schneider, Stefan Balthasar and Jürgens, Mirko and Karl, Holger}, booktitle = {IFIP/IEEE International Symposium on Integrated Network Management (IM)}, keyword = {network management, service management, coordination, hierarchical, scalability, nfv}, location = {Bordeaux, France}, publisher = {IFIP/IEEE}, title = {{Divide and Conquer: Hierarchical Network and Service Coordination}}, year = {2021}, } @inproceedings{20681, abstract = {The battle of developing hardware Trojans and corresponding countermeasures has taken adversaries towards ingenious ways of compromising hardware designs by circumventing even advanced testing and verification methods. Besides conventional methods of inserting Trojans into a design by a malicious entity, the design flow for field-programmable gate arrays (FPGAs) can also be surreptitiously compromised to assist the attacker to perform a successful malfunctioning or information leakage attack. The advanced stealthy malicious look-up-table (LUT) attack activates a Trojan only when generating the FPGA bitstream and can thus not be detected by register transfer and gate level testing and verification. However, also this attack was recently revealed by a bitstream-level proof-carrying hardware (PCH) approach. In this paper, we present a novel attack that leverages malicious routing of the inserted Trojan circuit to acquire a dormant state even in the generated and transmitted bitstream. The Trojan's payload is connected to primary inputs/outputs of the FPGA via a programmable interconnect point (PIP). The Trojan is detached from inputs/outputs during place-and-route and re-connected only when the FPGA is being programmed, thus activating the Trojan circuit without any need for a trigger logic. Since the Trojan is injected in a post-synthesis step and remains unconnected in the bitstream, the presented attack can currently neither be prevented by conventional testing and verification methods nor by recent bitstream-level verification techniques.}, author = {Ahmed, Qazi Arbab and Wiersema, Tobias and Platzner, Marco}, location = {Alpexpo | Grenoble, France}, publisher = {2021 Design, Automation and Test in Europe Conference (DATE)}, title = {{Malicious Routing: Circumventing Bitstream-level Verification for FPGAs}}, year = {2021}, } @article{21021, author = {Tiedau, J. and Engelkemeier, M. and Brecht, Benjamin and Sperling, J. and Silberhorn, Christine}, issn = {0031-9007}, journal = {Physical Review Letters}, title = {{Statistical Benchmarking of Scalable Photonic Quantum Systems}}, doi = {10.1103/physrevlett.126.023601}, volume = {126}, year = {2021}, } @misc{21196, author = {Schröder, Felix}, title = {{Benchmarking digitaler Gebrauchtgütermärkte - Eine Analyse zur Entwicklung von Best Practices am Beispiel von Miele Professional}}, year = {2021}, } @inproceedings{21204, author = {Kucklick, Jan-Peter and Müller, Oliver}, booktitle = { The AAAI-21 Workshop on Knowledge Discovery from Unstructured Data in Financial Services}, title = {{A Comparison of Multi-View Learning Strategies for Satellite Image-based Real Estate Appraisal}}, year = {2021}, } @article{21064, author = {Tinkloh, Steffen Rainer and Wu, Tao and Tröster, Thomas and Niendorf, Thomas}, issn = {2075-4701}, journal = {Metals}, title = {{The Effect of Fiber Waviness on the Residual Stress State and Its Prediction by the Hole Drilling Method in Fiber Metal Laminates: A Global-Local Finite Element Analysis}}, doi = {10.3390/met11010156}, year = {2021}, } @article{21254, author = {Balakrishna, Praneeth and Book, Gerrit and Kirchgässner, Wilhelm and Schenke, Maximilian and Traue, Arne and Wallscheid, Oliver}, issn = {2475-9066}, journal = {Journal of Open Source Software}, title = {{gym-electric-motor (GEM): A Python toolbox for the simulation of electric drive systems}}, doi = {10.21105/joss.02498}, year = {2021}, } @inproceedings{21259, author = {Klingler, Florian and Schettler, Max and Dimce, Sigrid and Amjad, Muhammad Sohaib and Dressler, Falko}, booktitle = {40th IEEE International Conference on Computer Communications (INFOCOM 2021), Poster Session}, publisher = {IEEE}, title = {{mmWave on the Road -- Field Testing IEEE 802.11ad WLAN at 60 GHz}}, year = {2021}, } @misc{21266, author = {Krüger, Noah}, title = {{Raising Money for a Good Cause – An Econometric Analysis of Key Factors to Successful Personal and Charitable Crowdfunding Campaigns}}, year = {2021}, } @inproceedings{21280, author = {Masendorf, Lukas and Wächter, Michael and Esderts, Alfons and Otroshi, Mortaza and Meschut, Gerson}, title = {{Simulationsbasierte Lebensdauerabschätzung einer stanzgenieteten Fügeverbindung unter zyklischer Belastung}}, year = {2021}, } @article{21374, abstract = {A dark-field scanning transmission ion microscopy detector was designed for the helium ion microscope. The detection principle is based on a secondary electron conversion holder with an exchangeable aperture strip allowing its acceptance angle to be tuned from 3 to 98 mrad. The contrast mechanism and performance were investigated using freestanding nanometer-thin carbon membranes. The results demonstrate that the detector can be optimized either for most efficient signal collection or for maximum image contrast. The designed setup allows for the imaging of thin low-density materials that otherwise provide little signal or contrast and for a clear end-point detection in the fabrication of nanopores. In addition, the detector is able to determine the thickness of membranes with sub-nanometer precision by quantitatively evaluating the image signal and comparing the results with Monte Carlo simulations. The thickness determined by the dark-field transmission detector is compared to X-ray photoelectron spectroscopy and energy-filtered transmission electron microscopy measurements.}, author = {Emmrich, Daniel and Wolff, Annalena and Meyerbröker, Nikolaus and Lindner, Jörg and Beyer, André and Gölzhäuser, Armin}, issn = {2190-4286}, journal = {Beilstein Journal of Nanotechnology}, pages = {222--231}, title = {{Scanning transmission helium ion microscopy on carbon nanomembranes}}, doi = {10.3762/bjnano.12.18}, year = {2021}, } @article{21401, author = {Bornemann, Tobias and Schipp, Adrian and Sureth-Sloane, Caren}, journal = {Deutsches Steuerrecht}, number = {3}, pages = {182--190}, title = {{Was treibt die Komplexität der Ertragsbesteuerung multinationaler Unternehmen? – Ergebnisse einer Befragung in der deutschen Finanzverwaltung}}, volume = {59}, year = {2021}, } @article{21285, author = {Mirbabaie, Milad and Brünker, F. and Wischnewski, M. and Meinert, J.}, journal = {ACM Transactions on Social Computing}, title = {{The Development of Connective Action during Social Movements on Social Media}}, year = {2021}, } @article{21297, author = {Mirbabaie, Milad and Ehnis, C. and Stieglitz, S. and Bunker, D. and Rose, T.}, journal = {Information Systems Frontiers}, title = {{Digital Nudging in Social Media Disaster Communication}}, year = {2021}, } @article{21300, author = {Brendel, A.B. and Mirbabaie, Milad and Lembcke, T.B. and Hofeditz, L.}, journal = {Sustainability}, title = {{Ethical Management of Artificial Intelligence}}, year = {2021}, } @article{21545, author = {Masendorf, Lukas and Wächter, Michael and Esderts, Alfons and Otroshi, Mortaza and Meschut, Gerson}, issn = {8756-758X}, journal = {Fatigue & Fracture of Engineering Materials & Structures}, pages = {15}, title = {{Service life estimation of self‐piercing riveted joints by linear damage accumulation}}, doi = {10.1111/ffe.13446}, year = {2021}, } @inproceedings{20857, author = {Camberg, Alan Adam and Tröster, Thomas and Latuske, Clemens}, location = {Wolfsburg}, publisher = {Springer}, title = {{Development of a hybrid crash-relevant car body component with load-adapted thickness properties: Design, manufacturing and testing}}, doi = {https://doi.org/10.1007/978-3-662-62924-6_28}, year = {2021}, } @article{21557, author = {Brosch, Anian and Wallscheid, Oliver and Bocker, Joachim}, issn = {1551-3203}, journal = {IEEE Transactions on Industrial Informatics}, pages = {1--1}, title = {{Torque and Inductances Estimation for Finite Model Predictive Control of Highly Utilized Permanent Magnet Synchronous Motors}}, doi = {10.1109/tii.2021.3060469}, year = {2021}, } @misc{21564, author = {Itner, Dominik and Gravenkamp, Hauke and Dreiling, Dmitrij and Feldmann, Nadine and Henning, Bernd}, title = {{On the forward simulation and cost functions for the ultrasonic material characterization of polymers }}, year = {2021}, } @techreport{21569, abstract = {Die kontinuierliche Weiterentwicklung des eigenen Geschäftsmodells ist für eine Organisation von entscheidender Bedeutung, um wettbewerbsfähig und somit nachhaltig erfolgreich zu bleiben. Während für die Entwicklung neuer Geschäftsmodelle häufig Workshops und einfache Software-Tools zur Visualisierung genutzt werden, wurden in der Forschung bereits erste Ansätze von datengetriebener Geschäftsmodellentwicklung (GME) vorgestellt. Diese Ansätze nutzen dabei Daten, Informationen oder auch Wissen aus internen und externen Unternehmensquellen, um den GME-Prozess zu unterstützen. Innerhalb dieses Beitrags zeigen wir einige Ansätze aus der aktuellen Literatur und analysieren wie ihre Datennutzung den GME-Prozess unterstützt. Weiterhin stellen wir mit dem BMDL Feature Modeler ein Tool vor, welches den GME-Prozess mit Expertenwissen unterstützt.}, author = {Gottschalk, Sebastian and Yigitbas, Enes}, publisher = {Gesellschaft für Informatik}, title = {{Von datenbasierter zu datengetriebener Geschäftsmodellentwicklung: Ein Überblick über Software-Tools und deren Datennutzung}}, volume = {1}, 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{21571, abstract = {The paper investigates the impact of individual attention on investor risk-taking. We analyze a large sample of trading records from a brokerage service that allows its customers to trade contracts-for-differences (CFD), and sends standardized push messages on recent stock performance to its client investors. The advantage of this sample is that it allows us to isolate the "push" messages as individual attention triggers, which we can directly link to the same individuals' risk-taking. A particular advantage of CFD trading is that it allows investors to make use of leverage, which provides us a pure measure of investors' willingness to take risks that is independent of the decision to purchase a particular stock. Leverage is a major catalyst of speculative trading, as it increases the scope of extreme returns, and enables investors to take larger positions than what they can afford with their own capital. We show that investors execute attention-driven trades with higher leverage, compared to their other trades, as well as those of other investors who are not alerted by attention triggers.}, author = {Arnold, Marc and Pelster, Matthias and Subrahmanyam, Marti G.}, journal = {Journal of Financial Economics}, title = {{Attention triggers and investors' risk-taking}}, year = {2021}, } @inproceedings{20807, author = {Bielak, Christian Roman and Böhnke, Max and Bobbert, Mathias and Meschut, Gerson}, location = {Lüttich}, title = {{Further development of a numerical method for analyzing the load capacity of clinched joints in versatile process chains}}, doi = {10.25518/esaform21.3418}, year = {2021}, } @inproceedings{21576, author = {Schulz, Andreas and Wecker, Christian and Kenig, Eugeny}, publisher = {Jahrestreffen der ProcessNet-Fachgruppe Mehrphasenströmung}, title = {{Mehrkomponenten-Stofftransport an bewegten Phasengrenzflächen unter Berücksichtigung von Diffusionskreuzeffekten}}, year = {2021}, } @article{21583, author = {Lanza, Lukas Johannes}, issn = {1617-7061}, journal = {PAMM}, title = {{Representation and stability of internal dynamics}}, doi = {10.1002/pamm.202000256}, year = {2021}, } @inbook{17905, abstract = {This chapter concentrates on aspect-based sentiment analysis, a form of opinion mining where algorithms detect sentiments expressed about features of products, services, etc. We especially focus on novel approaches for aspect phrase extraction and classification trained on feature-rich datasets. Here, we present two new datasets, which we gathered from the linguistically rich domain of physician reviews, as other investigations have mainly concentrated on commercial reviews and social media reviews so far. To give readers a better understanding of the underlying datasets, we describe the annotation process and inter-annotator agreement in detail. In our research, we automatically assess implicit mentions or indications of specific aspects. To do this, we propose and utilize neural network models that perform the here-defined aspect phrase extraction and classification task, achieving F1-score values of about 80% and accuracy values of more than 90%. As we apply our models to a comparatively complex domain, we obtain promising results. }, author = {Kersting, Joschka and Geierhos, Michaela}, booktitle = {Natural Language Processing in Artificial Intelligence -- NLPinAI 2020}, editor = {Loukanova, Roussanka}, pages = {163----189 }, publisher = {Springer}, title = {{Towards Aspect Extraction and Classification for Opinion Mining with Deep Sequence Networks}}, doi = {10.1007/978-3-030-63787-3_6}, volume = {939}, year = {2021}, } @article{21595, author = {Stockmann, Lars and Laux, Sven and Bodden, Eric}, issn = {2589-2258}, journal = {Journal of Automotive Software Engineering}, title = {{Using Architectural Runtime Verification for Offline Data Analysis}}, doi = {10.2991/jase.d.210205.001}, year = {2021}, } @misc{21627, author = {Liedtke, David}, title = {{Exploration and Convex Hull Construction in the Three-Dimensional Hybrid Model}}, year = {2021}, } @inproceedings{21610, author = {Awais, Muhammad and Ghasemzadeh Mohammadi, Hassan and Platzner, Marco}, booktitle = {Proceedings of the ACM Great Lakes Symposium on VLSI}, location = {Virtual}, title = {{LDAX: A Learning-based Fast Design Space Exploration Framework for Approximate Circuit Synthesis}}, year = {2021}, }