TY - JOUR AU - Kaliannan, Naveen Kumar AU - Henao Aristizabal, Andres AU - Wiebeler, Hendrik AU - Zysk, Frederik AU - Ohto, Tatsuhiko AU - Nagata, Yuki AU - D. Kühne, Thomas ID - 13232 JF - Molecular Physics TI - Impact of intermolecular vibrational coupling effects on the sum-frequency generation spectra of the water/air interface ER - TY - JOUR AU - Müller, Patrick AU - Neuba, Adam AU - Flörke, Ulrich AU - Henkel, Gerald AU - Kühne, Thomas D. AU - Bauer, Matthias ID - 13233 IS - 16 JF - The Journal of Physical Chemistry A TI - Experimental and Theoretical High Energy Resolution Hard X-ray Absorption and Emission Spectroscopy on Biomimetic Cu2S2 Complexes VL - 123 ER - TY - JOUR AB - Thermal treatment of hexaazatriphenylene-hexacarbonitrile (HAT-CN) in the temperature range from 500 °C to 700 °C leads to precise control over the degree of condensation{,} and thus atomic construction and porosity of the resulting C2N-type materials. Depending on the condensation temperature of HAT-CN{,} nitrogen contents of more than 30 at% can be reached. In general{,} these carbons show adsorption properties which are comparable to those known for zeolites but their pore size can be adjusted over a wider range. At condensation temperatures of 525 °C and below{,} the uptake of nitrogen gas remains negligible due to size exclusion{,} but the internal pores are large and polarizing enough that CO2 can still adsorb on part of the internal surface. This leads to surprisingly high CO2 adsorption capacities and isosteric heat of adsorption of up to 52 kJ mol−1. Theoretical calculations show that this high binding enthalpy arises from collective stabilization effects from the nitrogen atoms in the C2N layers surrounding the carbon atom in the CO2 molecule and from the electron acceptor properties of the carbon atoms from C2N which are in close proximity to the oxygen atoms in CO2. A true CO2 molecular sieving effect is achieved for the first time in such a metal-free organic material with zeolite-like properties{,} showing an IAST CO2/N2 selectivity of up to 121 at 298 K and a N2/CO2 ratio of 90/10 without notable changes in the CO2 adsorption properities over 80 cycles. AU - Walczak, Ralf AU - Savateev, Aleksandr AU - Heske, Julian Joachim AU - Tarakina, Nadezda V. AU - Sahoo, Sudhir AU - Epping, Jan D. AU - Kühne, Thomas AU - Kurpil, Bogdan AU - Antonietti, Markus AU - Oschatz, Martin ID - 13236 JF - Sustainable Energy Fuels TI - Controlling the strength of interaction between carbon dioxide and nitrogen-rich carbon materials by molecular design ER - TY - JOUR AU - Elgabarty, Hossam AU - Kaliannan, Naveen Kumar AU - Kühne, Thomas D. ID - 13237 JF - Scientific Reports TI - Enhancement of the asymmetry in the hydrogen bond network of liquid water by an ultrafast electric field pulse VL - 9 ER - TY - JOUR AU - Tanaka, Shunji AU - Tierney, Kevin AU - Parreño-Torres, Consuelo AU - Alvarez-Valdes, Ramon AU - Ruiz, Rubén ID - 13247 JF - European Journal of Operational Research SN - 0377-2217 TI - A Branch and Bound Approach for Large Pre-Marshalling Problems ER - TY - CONF AU - Ansótegui, Carlos AU - Heymann, Britta AU - Pon, Josep AU - Sellmann, Meinolf AU - Tierney, Kevin ID - 13250 SN - 978-3-030-05347-5 T2 - Learning and Intelligent Optimization TI - Hyper-Reactive Tabu Search for MaxSAT ER - TY - CONF AU - Wolters, Dennis AU - Kirchhoff, Jonas AU - Engels, Gregor ED - Yangui, Sami ED - Bouguettaya, Athman ED - Xue, Xiao ED - Faci, Noura ED - Gaaloul, Walid ED - Yu, Qi ED - Zhou, Zhangbing ED - Hernandez, Nathalie ED - Nakagawa, Elisa Y. ID - 13261 T2 - Service-Oriented Computing – ICSOC 2019 Workshops TI - Specifying Web Interfaces for Command-line Applications Based on OpenAPI VL - 12019 ER - TY - JOUR AU - Guevara-Carrion, Gabriela AU - Ancherbak, Sergiy AU - Mialdun, Aliaksandr AU - Vrabec, Jadran AU - Shevtsova, Valentina ID - 13270 JF - Scientific Reports SN - 2045-2322 TI - Diffusion of Methane in Supercritical Carbon Dioxide Across the Widom Line VL - 9 ER - TY - CONF AB - Automatic meeting analysis comprises the tasks of speaker counting, speaker diarization, and the separation of overlapped speech, followed by automatic speech recognition. This all has to be carried out on arbitrarily long sessions and, ideally, in an online or block-online manner. While significant progress has been made on individual tasks, this paper presents for the first time an all-neural approach to simultaneous speaker counting, diarization and source separation. The NN-based estimator operates in a block-online fashion and tracks speakers even if they remain silent for a number of time blocks, thus learning a stable output order for the separated sources. The neural network is recurrent over time as well as over the number of sources. The simulation experiments show that state of the art separation performance is achieved, while at the same time delivering good diarization and source counting results. It even generalizes well to an unseen large number of blocks. AU - von Neumann, Thilo AU - Kinoshita, Keisuke AU - Delcroix, Marc AU - Araki, Shoko AU - Nakatani, Tomohiro AU - Haeb-Umbach, Reinhold ID - 13271 T2 - ICASSP 2019, Brighton, UK TI - All-neural Online Source Separation, Counting, and Diarization for Meeting Analysis ER - TY - JOUR AU - Chatwell, René Spencer AU - Heinen, Matthias AU - Vrabec, Jadran ID - 13273 JF - International Journal of Heat and Mass Transfer SN - 0017-9310 TI - Diffusion Limited Evaporation of a Binary Liquid Film VL - 132 ER - TY - JOUR AU - Fingerhut, Robin AU - Vrabec, Jadran ID - 13274 JF - Fluid Phase Equilibria SN - 0378-3812 TI - Kirkwood-Buff Integration: A Promising Route to Entropic Properties? ER - TY - JOUR AU - Lin, Zemeng AU - Huang, Lingling AU - Xu, Zhen Tao AU - Li, Xiaowei AU - Zentgraf, Thomas AU - Wang, Yongtian ID - 13282 IS - 21 JF - Advanced Optical Materials SN - 2195-1071 TI - Four‐Wave Mixing Holographic Multiplexing Based on Nonlinear Metasurfaces VL - 7 ER - TY - CONF AB - Building on 5G and network function virtualization (NFV), smart manufacturing has the potential to drastically increase productivity, reduce cost, and introduce novel, flexible manufacturing services. Current work mostly focuses on high-level scenarios or emulation-based prototype deployments. Extending our previous work, we showcase one of the first cloud-native 5G verticals focusing on the deployment of smart manufacturing use cases on production infrastructure. In particular, we use the 5GTANGO service platform to deploy our developed network services on Kubernetes. For this demo, we implemented a series of cloud-native virtualized network functions (VNFs) and created suitable service descriptors. Their light-weight, stateless deployment on Kubernetes enables quick instantiation, scalability, and robustness. AU - Schneider, Stefan Balthasar AU - Peuster, Manuel AU - Hannemann, Kai AU - Behnke, Daniel AU - Müller, Marcel AU - Bök, Patrick-Benjamin AU - Karl, Holger ID - 13292 KW - 5G KW - NFV KW - Smart Manufacturing KW - Cloud-Native KW - Kubernetes T2 - IEEE Conference on Network Function Virtualization and Software Defined Networks (NFV-SDN) Demo Track TI - "Producing Cloud-Native": Smart Manufacturing Use Cases on Kubernetes ER - TY - JOUR AU - Cho, F. H. AU - Peng, Z. AU - Biktagirov, T. AU - Gerstmann, Uwe AU - Takahashi, S. ID - 13294 IS - 13 JF - The Journal of Chemical Physics TI - Investigation of Near-Surface Defects of Nanodiamonds by High-Frequency EPR and DFT Calculation VL - 150 ER - TY - JOUR AU - von Bardeleben, Hans Jürgen AU - Zhou, Shengqiang AU - Gerstmann, Uwe AU - Skachkov, Dmitry AU - Lambrecht, Walter R. L. AU - Ho, Quoc Duy AU - Deák, Peter ID - 13295 JF - APL Materials TI - Proton Irradiation Induced Defects in β-Ga2O3: A Combined EPR and Theory Study VL - 7 ER - TY - JOUR AU - Schulz, Andreas AU - Wecker, Christian AU - Kenig, Eugeny ID - 13390 JF - Chemie Ingenieur Technik TI - Methode zur Erfassung von Stofftransport an fluiden Phasengrenzflächen ER - TY - GEN AU - Schulz, Andreas AU - Wecker, Christian AU - Kenig, Eugeny ID - 13393 TI - Ein Finite-Volumen Ansatz für den Stoffübergang an bewegten Phasengrenzflächen ER - TY - GEN AU - Wecker, Christian AU - Schulz, Andreas AU - Heine, Jens AU - Bart, Hans-Joerg AU - Kenig, Eugeny ID - 13394 TI - Numerische Untersuchungen zum Stofftransport und Fluidmechanik bei der Tropfenbildung ER - TY - GEN AU - Heine, Jens AU - Wecker, Christian AU - Kenig, Eugeny AU - Bart, Hans-Joerg ID - 13395 TI - Visualization of Marangoni Phenomena during Droplet Formation ER - TY - GEN AU - Heine, Jens AU - Wecker, Christian AU - Kenig, Eugeny AU - Bart, Hans-Joerg ID - 13396 TI - In-situ Messung des Stofftransports bei der Tropfenbildung ER - TY - GEN AU - Wecker, Christian AU - Schulz, Andreas AU - Heine, Jens AU - Bart, Hans-Joerg AU - Kenig, Eugeny ID - 13397 TI - Stofftransport und Fluidmechanik bei der Tropfenbildung unter Berücksichtigung von Marangonikonvektion mittels CFD ER - TY - GEN AU - Heine, Jens AU - Wecker, Christian AU - Kenig, Eugeny AU - Bart, Hans-Joerg ID - 13398 TI - Stofftransport bei der Tropfenbildung ER - TY - GEN AU - Zibart, Alexander AU - Kenig, Eugeny ID - 13399 TI - Reduktion von parasitären Strömungen in Mehrphasensimulationen durch Verwendung der Height-Function Methode ER - TY - JOUR AU - Dridger, A. AU - Caylak, I. AU - Mahnken, R. AU - Penner, E. ID - 13431 JF - Safety and Reliability SN - 0961-7353 TI - "A possibilistic finite element method for sparse data" ER - TY - JOUR AU - Ju, Xiaozhe AU - Mahnken, Rolf ID - 13432 JF - Computer Methods in Applied Mechanics and Engineering SN - 0045-7825 TI - "Goal-oriented h-type adaptive finite elements for micromorphic elastoplasticity" ER - TY - JOUR AU - Mäck, Markus AU - Caylak, Ismail AU - Edler, Philipp AU - Freitag, Steffen AU - Hanss, Michael AU - Mahnken, Rolf AU - Meschke, Günther AU - Penner, Eduard ID - 13434 JF - GAMM-Mitteilungen SN - 0936-7195 TI - "Optimization with constraints considering polymorphic uncertainties" ER - TY - GEN AU - Friesen, Edwin ID - 13435 TI - Requirements Engineering im OTF-Computing: Informationsextraktion und Unvollständigkeitskompensation mittels domänenspezifischer Wissensbasis ER - TY - CHAP AU - Camberg, Alan Adam AU - Stratmann, Ina AU - Tröster, Thomas ID - 13436 SN - 2524-4787 T2 - Technologies for economical and functional lightweight design TI - TAILORED STACKED HYBRIDS – AN OPTIMIZATION-BASED APPROACH IN MATERIAL DESIGN FOR FURTHER IMPROVEMENT IN LIGHTWEIGHT CAR BODY STRUCTURES ER - TY - CONF AU - Manavi, Seyed Alborz AU - Kenig, Eugeny ID - 13442 SN - 1570-7946 T2 - Computer Aided Chemical Engineering TI - Numerical Simulation of Forced Convection in a Microchannel with Realistic Roughness of 3D Printed Surface ER - TY - CONF AB - This work considers the problem of control and resource allocation in networked systems. To this end, we present DIRA a Deep reinforcement learning based Iterative Resource Allocation algorithm, which is scalable and control-aware. Our algorithm is tailored towards large-scale problems where control and scheduling need to act jointly to optimize performance. DIRA can be used to schedule general time-domain optimization based controllers. In the present work, we focus on control designs based on suitably adapted linear quadratic regulators. We apply our algorithm to networked systems with correlated fading communication channels. Our simulations show that DIRA scales well to large scheduling problems. AU - Redder, Adrian AU - Ramaswamy, Arunselvan AU - Quevedo, Daniel ID - 13443 KW - Networked control systems KW - deep reinforcement learning KW - large-scale systems KW - resource scheduling KW - stochastic control T2 - Proceedings of the 8th IFAC Workshop on Distributed Estimation and Control in Networked Systems TI - Deep reinforcement learning for scheduling in large-scale networked control systems ER - TY - JOUR AU - Eggert, Andreas AU - Kleinaltenkamp, Michael AU - Kashyap, Vishal ID - 13454 JF - Industrial Marketing Management TI - Mapping Value in Business Markets: An Integrative Framework VL - 79 ER - TY - JOUR AU - Garnefeld, Ina AU - Eggert, Andreas AU - Husemann-Kopetzky, Markus AU - Boehm, Eva ID - 13455 IS - 4 JF - Journal of the Academy of Marketing Science TI - Exploring the link between payment schemes and customer fraud: a mental accounting perspective VL - 47 ER - TY - CONF AU - Eggert, Andreas AU - Boehm, Eva AU - Akalan, Rodi AU - Gebauer, Heiko ID - 13456 TI - Service Growth by Acquisition – An Event Study ER - TY - JOUR AU - Eggert, Andreas AU - Steinhoff, Lena AU - Witte, Carina ID - 13457 JF - Journal of Marketing TI - Gift Purchases as Catalysts for Strengthening Customer–Brand Relationships ER - TY - BOOK AB - Dieses Buch beschreibt basierend auf dem gleichnamigen Innovationsprojekt im Spitzencluster it’s OWL die Entwicklung intelligenter Verfahren und Systeme, um auch unter variablen Produktionsbedingungen eine zuverlässige Massenfertigung von Kupferbondverbindungen sicherzustellen.Dabei wird der gesamte Prozess der Ultraschall-Verbindungsbildung modelliert. Dies beinhaltet u. a. ein Reibmodell mit gekoppeltem Anbindungsmodell, den Ultraschall-Erweichungseffekt und den Verschleiß des Bondwerkzeugs. Zudem wird das Konzept einer selbstoptimierenden Bondmaschine vorgestellt, welche Prozessparameter in Abhängigkeit von Störgrößen wie Verschleiß anpasst.Das Ultraschallbonden mit Aluminiumdraht ist ein etabliertes Fertigungsverfahren zur Kontaktierung von Leistungshalbleitern. Zukünftige Leistungshalbleiterchips erfordern jedoch einen Technologiewechsel zu Kupferdraht. Die Prozessparameter unterscheiden sich dabei deutlich von den bekannten Aluminiumprozessen, ihre Wechselwirkungen sind weitestgehend unbekannt. AU - Sextro, Walter AU - Brökelmann, Michael ID - 10002 KW - Abschlussbericht zum Spitzenclusterprojekt InCuB TI - Intelligente Herstellung zuverlässiger Kupferbondverbindungen VL - VIII ER - TY - JOUR AU - Fränzle, Martin AU - Kapur, Deepak AU - Wehrheim, Heike AU - Zhan, Naijun ID - 10011 IS - 1 JF - Formal Asp. Comput. TI - Editorial VL - 31 ER - TY - CONF AU - Johannesmann, Sarah AU - Springer, Dimitri AU - Thiel, Christian AU - Henning, Bernd ED - Gesellschaft für Akustik e.V., Deutsche ID - 10042 T2 - Fortschritte der Akustik - DAGA 2019 TI - Störeffektunterdrückung in 2D-Messdaten mittels DiscoGAN VL - 45 ER - TY - JOUR AU - Gries, Thomas ID - 10090 JF - The American Economist SN - 0569-4345 TI - A New Theory of Demand-Restricted Growth: The Basic Idea ER - TY - CONF AU - König, Jürgen AU - Wehrheim, Heike ED - M. Badger, Julia ED - Yvonne Rozier, Kristin ID - 10091 T2 - {NASA} Formal Methods - 11th International Symposium, {NFM} 2019, Houston, TX, USA, May 7-9, 2019, Proceedings TI - Data Independence for Software Transactional Memory VL - 11460 ER - TY - CONF AU - Doherty, Simon AU - Dongol, Brijesh AU - Wehrheim, Heike AU - Derrick, John ED - K. Hollingsworth, Jeffrey ED - Keidar, Idit ID - 10092 T2 - Proceedings of the 24th {ACM} {SIGPLAN} Symposium on Principles and Practice of Parallel Programming, PPoPP 2019, Washington, DC, USA, February 16-20, 2019 TI - Verifying C11 programs operationally ER - TY - CONF AU - Beyer, Dirk AU - Jakobs, Marie-Christine AU - Lemberger, Thomas AU - Wehrheim, Heike ED - Becker, Steffen ED - Bogicevic, Ivan ED - Herzwurm, Georg ED - Wagner, Stefan ID - 10093 T2 - Software Engineering and Software Management (SE/SWM 2019), Stuttgart, Germany, February 18-22, 2019 TI - Combining Verifiers in Conditional Model Checking via Reducers VL - P-292 ER - TY - CONF AU - Sharma, Arnab AU - Wehrheim, Heike ED - Becker, Steffen ED - Bogicevic, Ivan ED - Herzwurm, Georg ED - Wagner, Stefan ID - 10094 T2 - Software Engineering and Software Management, {SE/SWM} 2019, Stuttgart, Germany, February 18-22, 2019 TI - Testing Balancedness of ML Algorithms VL - {P-292} ER - TY - CONF AU - Richter, Cedric AU - Wehrheim, Heike ED - Beyer, Dirk ED - Huisman, Marieke ED - Kordon, Fabrice ED - Steffen, Bernhard ID - 10095 T2 - Tools and Algorithms for the Construction and Analysis of Systems - 25 Years of {TACAS:} TOOLympics, Held as Part of {ETAPS} 2019, Prague, Czech Republic, April 6-11, 2019, Proceedings, Part {III} TI - PeSCo: Predicting Sequential Combinations of Verifiers - (Competition Contribution) VL - 11429 ER - TY - JOUR AU - Beyer, Dirk AU - Wehrheim, Heike ID - 10096 JF - CoRR TI - Verification Artifacts in Cooperative Verification: Survey and Unifying Component Framework VL - abs/1905.08505 ER - TY - JOUR AB - We investigate the demographic characteristics, trading patterns, and performance of 465.926 brokerage accounts with respect to cryptocurrency trading. We find that cryptocurrency trading became increasingly popular across individuals of all different groups of age, gender, and trading patterns. Yet, men are more likely to engage in cryptocurrency trading, trade more frequently, and more speculative, respectively. As a result, men realize lower returns. Furthermore, we find that investors vary their trading patterns across different asset classes. AU - Hasso, Tim AU - Pelster, Matthias AU - Breitmayer, Bastian ID - 10103 JF - Journal of Behavioral and Experimental Finance KW - Cryptocurrencies Bitcoin Trading Investor returns Demographics TI - Who trades cryptocurrencies, how do they trade it, and how do they perform? Evidence from brokerage accounts VL - 23 ER - TY - GEN AU - Haltermann, Jan ID - 10105 TI - Analyzing Data Usage in Array Programs ER - TY - CONF AU - Webersen, Manuel AU - Hüttner, Matthias AU - Woitschek, Fabian AU - Moritzer, Elmar AU - Henning, Bernd ID - 10135 T2 - Fortschritte der Akustik - DAGA 2019 TI - Akustische Charakterisierung der mechanischen Eigenschaften künstlich gealterter Polymere ER - TY - CONF AB - Existing tools for automated machine learning, such as Auto-WEKA, TPOT, auto-sklearn, and more recently ML-Plan, have shown impressive results for the tasks of single-label classification and regression. Yet, there is only little work on other types of machine learning problems so far. In particular, there is almost no work on automating the engineering of machine learning solutions for multi-label classification (MLC). We show how the scope of ML-Plan, an AutoML-tool for multi-class classification, can be extended towards MLC using MEKA, which is a multi-label extension of the well-known Java library WEKA. The resulting approach recursively refines MEKA's multi-label classifiers, nesting other multi-label classifiers for meta algorithms and single-label classifiers provided by WEKA as base learners. In our evaluation, we find that the proposed approach yields strong results and performs significantly better than a set of baselines we compare with. AU - Wever, Marcel Dominik AU - Mohr, Felix AU - Tornede, Alexander AU - Hüllermeier, Eyke ID - 10232 TI - Automating Multi-Label Classification Extending ML-Plan ER - TY - CONF AB - Gummi-Metall-Teile (GM-Teile) werden zur Schwingungsreduktion u. a. in Windenergieanlagen eingesetzt. Mögliche Anwendungen der Teile liegen in Wellen-, Generator- und Getriebelagerungen, Lagern für die Gondel und ihre Komponenten sowie in Drehmomentstützen. Mit dem Ziel eine prädiktive Instandhaltung zu realisieren, soll eine Zustandsüberwachung für die GM-Teile entwickelt werden. Diese Entwicklung basiert auf der Umsetzung diverser Schritte. Neben der funktionalen Betrachtung wird zwingend auch die konstruktive Integration der Sensoren in das überwachte Teil berücksichtigt. Der Schwerpunkt dieser Arbeit liegt auf der verwendeten Messgröße Temperatur, die mittels ausgewählter Sensorik detektiert wird. Dabei werden Lebensdauerversuche unter instationären Betriebsbedingungen durchgeführt, um diese Messdaten zu generieren. In der Datenauswertung werden sie hinsichtlich der Degradierung des GM-Teils analysiert und für die Ermittlung der nutzbaren Restlebensdauer verwendet. Rubber-metal-elements are used for isolation of vibrations e. g. in wind turbines. Possible applications of the elements are shaft bearings, generator bearings, gearbox bearings, bearings for the nacelle and its components and torque supports. In order to realize predictive maintenance, an accurate condition monitoring system for rubber-metal-elements should be developed. During that development different aspects have to be implemented. Additionally to the functional analysis, the constructive integration of the sensors into the monitored part is mandatory. The focus of this work is on the measured variable temperature, which is detected by means of appropriate sensors. Thereby lifetime tests are run under non-stationary operating conditions to generate temperature measurements. During data analysis, the measured data is analyzed regarding the degradation of the rubber-metal-elements and remaining useful lifetimes are estimated. AU - Bender, Amelie AU - Reinke, Kai AU - Sextro, Walter ID - 10255 T2 - 10. VDI-Fachtagung Schwingungen von Windenergieanlagen 2019 TI - Konstruktion und Zustandsüberwachung eines Gummi-Metall-Teils mit integriertem Thermoelement VL - VDI-Berichte 2346 ER - TY - CONF AB - In der Entwicklung mechatronischer Systeme spielt die Steigerung der Verlässlichkeit und somit auch der Zuverlässigkeit und der funktionalen Sicherheit eine entscheidende Rolle. Die modellbasierte Entwicklung liefert in Kombination mit unterstützender Software einen wichtigen Beitrag zur Absicherung der Verlässlichkeit mechatronischer Systeme in frühen Entwicklungsphasen. In der Nutzungsphase ermöglichen aktuelle Verfahren der Zustandsüberwachung und moderne Methoden der Regelungstechnik eine effektive Absicherung. Modelle aus der Entwicklung mechatronischer Systeme enthalten weitreichende Informationen über die Architektur, das Verhalten und die Verlässlichkeit eines Systems. Diese Modelle können als Grundlage für die Erstellung eines Digitalen Zwillings für die vorausschauende Instandhaltung verwendet und mit Zustandsdaten des realen Systems kombiniert werden. Die Nutzung der Modelle für den Digitalen Zwilling bietet weitreichende Potenziale und vereinfacht dessen Erzeugung. Die Veröffentlichung beschreibt Rahmenbedingungen der Integration und stellt die Potenziale des Digitalen Zwillings zur vorausschauenden Instandhaltung dar. AU - Kaul, Thorben AU - Hentze, Julian AU - Sextro, Walter AU - Gräßler, Iris ID - 10257 T2 - Fachtagung Mechatronik 2019 Paderborn TI - Integration von Verlässlichkeitsmodellen der Entwicklung in einen Digitalen Zwilling zur Umsetzung einer vorausschauenden Instandhaltung ER - TY - CONF AB - Für die Zerstäubung hochviskoser Flüssigkeiten werden neben Düsenzerstäubern vor allem UltraschallStehwellenzerstäuber angewendet [1]. Diese ermöglichen ohne weitere Maßnahmen zwar keine gerichtete Zerstäubung, benötigen jedoch im Gegensatz zu Düsenzerstäubern keine hohen Drücke und haben keine hohen Austrittsgeschwindigkeiten. Zur Erzeugung der Ultraschallwellen werden typischerweise piezoelektrische, mit Bolzen verschraubte LangevinWandler verwendet [1-4], die eine starke Schallabstrahlung bei einer elektrischen Eingangsleistung von bis zu einigen Kilowatt erzeugen können. Wie bei jedem anderen schwingenden System emittiert der Ultraschallwandler zunächst eine Wanderwelle. Mit einem Reflektor, der gegenüber der Sonotrode angeordnet ist, wird eine stehende Welle erzeugt. Im Resonanzabstand zwischen Reflektor und Wandler werden abgestrahlte und reflektierte Wellen so überlagert, dass höhere Schalldruckamplituden erzielt werden. Ein einfacher Ansatz zur Maximierung des Schallpegels im Stehwellenfeld ist die Erhöhung der Schwingungsamplituden des Wandlers, die jedoch zu Schäden oder zumindest zu einer Verringerung der Lebensdauer führen kann. Hohe Schalldrücke werden auch bei geringen Abständen zwischen Wandler und Reflektor erreicht. Das Volumen des Schallfeldes ist in diesem Fall jedoch für die meisten Prozesse zu klein. Ein weiterer Ansatz ist die Verwendung zweier entgegengesetzt angeordneter Wandler [5]. In diesem Fall erfordert jedoch die Erzeugung einer stehenden Welle eine genaue Abstimmung von Frequenz und Phase beider Wandler, was eine komplexe Steuerung erfordert. Ebenso ist es möglich, geometrische Randbedingungen des Stehwellensystems zu optimieren, sodass es zu optimaler Interferenz der Wellen kommt. Im Folgenden wird der Anschaulichkeit halber vereinfachend angenommen, dass der Wandler an seiner Sonotrodenoberfläche einzelne Schallstrahlen aussendet, die in Nähe des Wandlers nahezu parallel verlaufen und sich mit zunehmender Entfernung vom Wandler auffächern. Ein einfaches Stehwellensystem, bestehend aus ebener Sonotrode und ebenem Reflektor, erzeugt bei kleinem Abstand zwischen Sonotrode und Reflektor sehr hohe Schallpegel, da nahezu sämtliche ausgesandten Schallstrahlen in Richtung der Sonotrode reflektiert werden positive Interferenz entsteht. Erhöht man jedoch den Abstand zwischen Sonotrode und Reflektor, so nehmen die Verluste durch Schallstrahlen, die den Prozessraum verlassen, zu. Wie Abbildung 1 gezeigt, werden nur Schallstrahlen, die in etwa parallel zur Rotationsachse verlaufen, zum Wandler zurück reflektiert und tragen zum Stehwellenfeld bei. Die Strahlen haben zudem abhängig vom Abstrahlwinkel unterschiedliche Weglängen. Die Stehwellenbedingung ist demnach nur für Strahlen in der Nähe der Rotationsachse exakt erfüllt. Um dies zu vermeiden, müssen die Geometrien von Wandler und Reflektor optimiert werden. In den folgenden Abschnitten wird zunächst ein Optimierungsansatz vorgestellt. Mithilfe eines FiniteElemente-Modells werden die Auswirkungen einer optimierten Geometrie auf den maximalen Schalldruckpegel untersucht. Ergebnisse werden durch Messungen an einem experimentellen Aufbau eines Stehwellensystems validiert. Es wird gezeigt, wie sich die Optimierung der geometrischen Randbedingungen auf die Zerstäubung hochviskoser Flüssigkeiten auswirkt. AU - Dunst, Paul AU - Hemsel, Tobias AU - Bornmann, Peter AU - Littmann, Walter AU - Sextro, Walter ID - 10258 T2 - DAGA 2019 TI - Modellbasierte und experimentelle Charakterisierung von intensiven Ultraschall-Stehwellenfeldern für die Zerstäubung hochviskoser Flüssigkeiten ER - TY - GEN AU - N., N. ID - 10271 TI - Implementation and Evaluation of Authenticated Data Structures Using Intel SGX Enclaves ER - TY - GEN AU - Althaus, Steffen ID - 10277 TI - Optimizing Sales Channel Performance with Digital Experiments in the Crafting Industry ER - TY - JOUR AB - Are cryptocurrency traders driven by a desire to invest in a new asset class to diversify their portfolio or are they merely seeking to increase their levels of risk? To answer this question, we use individual-level brokerage data and study their behavior in stock trading around the time they engage in their first cryptocurrency trade. We find that when engaging in cryptocurrency trading investors simultaneously increase their risk-seeking behavior in stock trading as they increase their trading intensity and use of leverage. The increase in risk-seeking in stocks is particularly pronounced when volatility in cryptocurrency returns is low, suggesting that their overall behavior is driven by excitement-seeking. AU - Pelster, Matthias AU - Breitmayer, Bastian AU - Hasso, Tim ID - 10279 JF - Economics Letters KW - cryptocurrencies KW - bitcoin KW - investor KW - risk-seeking SN - 0165-1765 TI - Are cryptocurrency traders pioneers or just risk-seekers? evidence from brokerage accounts VL - 182 ER - TY - CONF AB - Competing firms tend to select similar locations for their stores. This phenomenon, called the principle of minimum differentiation, was captured by Hotelling with a landmark model of spatial competition but is still the object of an ongoing scientific debate. Although consistently observed in practice, many more realistic variants of Hotelling's model fail to support minimum differentiation or do not have pure equilibria at all. In particular, it was recently proven for a generalized model which incorporates negative network externalities and which contains Hotelling's model and classical selfish load balancing as special cases, that the unique equilibria do not adhere to minimum differentiation. Furthermore, it was shown that for a significant parameter range pure equilibria do not exist. We derive a sharp contrast to these previous results by investigating Hotelling's model with negative network externalities from an entirely new angle: approximate pure subgame perfect equilibria. This approach allows us to prove analytically and via agent-based simulations that approximate equilibria having good approximation guarantees and that adhere to minimum differentiation exist for the full parameter range of the model. Moreover, we show that the obtained approximate equilibria have high social welfare. AU - Feldotto, Matthias AU - Lenzner, Pascal AU - Molitor, Louise AU - Skopalik, Alexander ID - 10281 T2 - Proceedings of the 18th International Conference on Autonomous Agents and MultiAgent Systems TI - From Hotelling to Load Balancing: Approximation and the Principle of Minimum Differentiation ER - TY - JOUR AU - Lin, Zemeng AU - Huang, Lingling AU - Zhao, Ruizhe AU - Wei, Qunshuo AU - Zentgraf, Thomas AU - Wang, Yongtian AU - Li, Xiaowei ID - 10282 IS - 13 JF - Optics Express SN - 1094-4087 TI - Dynamic control of mode modulation and spatial multiplexing using hybrid metasurfaces VL - 27 ER - TY - CONF AB - We study text reuse related to Wikipedia at scale by compiling the first corpus of text reuse cases within Wikipedia as well as without (i.e., reuse of Wikipedia text in a sample of the Common Crawl). To discover reuse beyond verbatim copy and paste, we employ state-of-the-art text reuse detection technology, scaling it for the first time to process the entire Wikipedia as part of a distributed retrieval pipeline. We further report on a pilot analysis of the 100 million reuse cases inside, and the 1.6 million reuse cases outside Wikipedia that we discovered. Text reuse inside Wikipedia gives rise to new tasks such as article template induction, fixing quality flaws, or complementing Wikipedia's ontology. Text reuse outside Wikipedia yields a tangible metric for the emerging field of quantifying Wikipedia's influence on the web. To foster future research into these tasks, and for reproducibility's sake, the Wikipedia text reuse corpus and the retrieval pipeline are made freely available. AU - Alshomary, Milad AU - Völske, Michael AU - Licht, Tristan AU - Wachsmuth, Henning AU - Stein, Benno AU - Hagen, Matthias AU - Potthast, Martin ED - Azzopardi, Leif ED - Stein, Benno ED - Fuhr, Norbert ED - Mayr, Philipp ED - Hauff, Claudia ED - Hiemstra, Djoerd ID - 10284 SN - 978-3-030-15712-8 T2 - Advances in Information Retrieval TI - Wikipedia Text Reuse: Within and Without ER - TY - THES AU - Gutt, Dominik ID - 10290 TI - Essays on Drivers and Economic Outcomes of Online-Reviews ER - TY - GEN AU - Porzenheim, Laurens Alexander ID - 10306 TI - Post-Quantum Secure Group Signatures ER - TY - JOUR AU - Peuster, Manuel AU - Marchetti, Michael AU - García de Blas, Gerardo AU - Karl, Holger ID - 10325 JF - EURASIP Journal on Wireless Communications and Networking SN - 1687-1499 TI - Automated testing of NFV orchestrators against carrier-grade multi-PoP scenarios using emulation-based smoke testing ER - TY - GEN AB - We analyze the incentives for retail bundling and the welfare effects of retail bundling in a decentralized distribution channel with two retailers and two monopolistic manufacturers. One manufacturer exclusively sells his good to one retailer, whereas the other manufacturer sells his good to both retailers. Thus, one retailer is a monopolist for one product but competes with the other retailer in the second product market. The two-product retailer has the option to bundle his goods or to sell them separately. We find that bundling aggravates the double marginalization problem for the bundling retailer. Nevertheless, when the retailers compete in prices, bundling can be more profitable than separate selling for the retailer as bundling softens the retail competition. The ultimate outcome depends on the manufacturers’ marginal costs. Given retail quantity competition, however, bundling is in no case the retailer’s best strategy. Furthermore, we show that profitable bundling reduces consumer and producer surplus in the equilibrium. AU - Heinzel, Joachim Maria Josef ID - 10332 KW - retail bundling KW - leverage theory KW - double marginalization TI - Bundling in a Distribution Channel with Retail Competition ER - TY - GEN AU - Pukrop, Simon ID - 10344 TI - Scheduling Algorithms for Multi-Operation Jobs with Setups on a Single Machine ER - TY - CONF AB - We propose a novel personal reputation system for cross-platform reputation. We observe that, in certain usage scenarios, e.g. crowd work, the rater anonymity property typically imposed on reputation systems is not necessary. Instead, we propose a relaxed notion of rater anonymity that is more applicable in the crowd work scenario. This allows us to construct a secure personal reputation system from simple cryptographic primitives. AU - Blömer, Johannes AU - Löken, Nils ID - 13554 T2 - Security and Trust Management, STM 2019 TI - Personal Cross-Platform Reputation VL - 11738 ER - TY - CONF AB - We present a searchable encryption scheme for dynamic document collections in a multi-user scenario. Our scheme features fine-grained access control to search results, as well as access control to operations such as adding documents to the document collection, or changing individual documents. The scheme features verifiability of search results. Our scheme also satisfies the forward privacy notion crucial for the security of dynamic searchable encryption schemes. AU - Blömer, Johannes AU - Löken, Nils ID - 13557 T2 - 12th International Symposium on Foundations and Practice of Security, FPS 2019 TI - Dynamic Searchable Encryption with Access Control VL - 12056 ER - TY - CONF AU - Bohn, Nicolai AU - Kundisch, Dennis ID - 13585 T2 - Proceedings of the 40th International Conference on Information Systems (ICIS) TI - All Things Considered? – Technology Design Decision-making Characteristics in Digital Startups ER - TY - GEN AU - Seutter, Janina AU - Neumann, Jürgen ID - 13586 T2 - Proceedings of the 40th International Conference on Information Systems (ICIS) TI - Head over Feels? Differences in Online Rating Behavior for Utilitarian and Hedonic Service Aspects ER - TY - CONF AU - Gutt, Dominik AU - Neumann, Jürgen AU - Jabr, W. AU - Kundisch, Dennis ID - 13587 T2 - Proceedings of the 40th International Conference on Information Systems (ICIS) TI - The App Updating Conundrum: Implications of Platform’s Rating Resetting on Developers’ Behavior ER - TY - GEN AU - Pilot, Matthias ID - 13592 TI - Efficient Finite-Field Arithmetic for Elliptic Curve Cryptography in Java ER - TY - CONF AU - Claes, Leander AU - Johannesmann, Sarah AU - Baumhögger, Elmar AU - Henning, Bernd ID - 13647 T2 - 2019 International Congress on Ultrasonics TI - Quantification of frequency-dependent absorption phenomena ER - TY - GEN AU - Scholz, Swante ID - 13648 TI - Implementation and Comparison of Elliptic Curve Algorithms in Java ER - TY - JOUR AB - Surfaces covered with layers of ultrathin nanoantenna structures—so called metasurfaces have recently been proven capable of completely controlling phase of light. Metalenses have emerged from the advance in the development of metasurfaces providing a new basis for recasting traditional lenses into thin, planar optical components capable of focusing light. The lens made of arrays of plasmonic gold nanorods were fabricated on a glass substrate by using electron beam lithography. A 1064 nm laser was used to create a high intensity circularly polarized light focal spot through metalens of focal length 800 µm, N.A. = 0.6 fabricated based on Pancharatnam-Berry phase principle. We demonstrated that optical rotation of birefringent nematic liquid crystal droplets trapped in the laser beam was possible through this metalens. The rotation of birefringent droplets convinced that the optical trap possesses strong enough angular momentum of light from radiation of each nanostructure acting like a local half waveplate and introducing an orientation-dependent phase to light. Here, we show the success in creating a miniaturized and robust metalens based optical tweezers system capable of rotating liquid crystals droplets to imitate an optical motor for future lab-on-a-chip applications. AU - Suwannasopon, Satayu AU - Meyer, Fabian AU - Schlickriede, Christian AU - Chaisakul, Papichaya AU - T-Thienprasert, Jiraroj AU - Limtrakul, Jumras AU - Zentgraf, Thomas AU - Chattham, Nattaporn ID - 13650 IS - 10 JF - Crystals SN - 2073-4352 TI - Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors VL - 9 ER - TY - JOUR AU - Chen, Shumei AU - Reineke, Bernhard AU - Li, Guixin AU - Zentgraf, Thomas AU - Zhang, Shuang ID - 13651 IS - 9 JF - Nano Letters SN - 1530-6984 TI - Strong Nonlinear Optical Activity Induced by Lattice Surface Modes on Plasmonic Metasurface VL - 19 ER - TY - CONF AU - Hinnenthal, Kristian AU - Scheideler, Christian AU - Struijs, Martijn ID - 13652 T2 - 33rd International Symposium on Distributed Computing (DISC 2019) TI - Fast Distributed Algorithms for LP-Type Problems of Low Dimension ER - TY - JOUR AU - Goller, Michael AU - Ursin, Jani AU - Vähäsantanen, Katja AU - Festner, Dagmar AU - Harteis, Christian ID - 13654 JF - Teaching and Teacher Education SN - 0742-051X TI - Finnish and German student teachers’ motivations for choosing teaching as a career. The first application of the FIT-Choice scale in Finland ER - TY - THES AU - Brauer, Sascha ID - 13679 TI - Classification and Approximation of Geometric Location Problems ER - TY - JOUR AU - Mahnken, Rolf AU - Ju, Xiaozhe ID - 13805 JF - International Journal for Numerical Methods in Engineering SN - 0029-5981 TI - Goal‐oriented adaptivity based on a model hierarchy of mean‐field and full‐field homogenization methods in linear elasticity ER - TY - JOUR AU - Dammann, Christian AU - Mahnken, Rolf ID - 13806 JF - Composites Part A: Applied Science and Manufacturing SN - 1359-835X TI - Simulation of a resin transfer molding process using a phase field approach within the theory of porous media VL - 120 ER - TY - JOUR AU - Ju, X. AU - Mahnken, R. ID - 13807 JF - PAMM TI - "Goal-oriented adaptivity on mean-field and full-field homogenization methods considering hierarchical unit cells" VL - 19 ER - TY - JOUR AU - Kremer, H.-Hugo AU - Frehe-Halliwell, Petra ID - 13809 JF - BWP TI - Entwicklungsförderliche Gestaltung von Qualifizierungsbausteinen in der dualisierten Ausbildungsvorbereitung ER - TY - CHAP AU - Kremer, H.-Hugo AU - Frehe-Halliwell, Petra ED - Veber, Marcel ED - Benölken, Ralf ED - Pfitzner, Michael ID - 13811 T2 - Potenzialorientierte Förderung in den Fachdidaktiken TI - Eine Analyse ausbildungsvorbereitender Bildungsgänge VL - Band 7 ER - TY - JOUR AU - Lenz, P. AU - Mahnken, R. ID - 13813 JF - PAMM TI - "Damage simulation of fiber reinforced composites using mean-field homogenization methods" VL - 19 ER - TY - JOUR AU - Schenke, Maximilian AU - Kirchgässner, Wilhelm AU - Wallscheid, Oliver ID - 25030 JF - IEEE Transactions on Industrial Informatics SN - 1551-3203 TI - Controller Design for Electrical Drives by Deep Reinforcement Learning: A Proof of Concept ER - TY - CONF AU - Grosser, Christine ID - 29859 TI - Welche Vorstellungen und Nutzenbewertungen äußern Referendare bzgl. des Forschenden Lernens im Referendariat? ER - TY - GEN AU - Grosser, Christine ID - 29860 TI - Lernstrategien und Lernhaltungen des Forschenden Lernens im Referendariat ER - TY - CONF AU - Joy, Meryl Teresa AU - Böcker, Joachim ID - 29885 T2 - 2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES) TI - Speed Estimation in Induction Machines at all Speed Ranges Using Sensing Windings ER - TY - CONF AU - Kirchgässner, Wilhelm AU - Wallscheid, Oliver AU - Böcker, Joachim ID - 21247 SN - 9781728136660 T2 - 2019 IEEE 28th International Symposium on Industrial Electronics (ISIE) TI - Empirical Evaluation of Exponentially Weighted Moving Averages for Simple Linear Thermal Modeling of Permanent Magnet Synchronous Machines ER - TY - CONF AU - Kirchgässner, Wilhelm AU - Wallscheid, Oliver AU - Böcker, Joachim ID - 21249 SN - 9781538693506 T2 - 2019 IEEE International Electric Machines & Drives Conference (IEMDC) TI - Deep Residual Convolutional and Recurrent Neural Networks for Temperature Estimation in Permanent Magnet Synchronous Motors ER - TY - CHAP AU - Rehlaender, Philipp AU - Schroeer, Maik AU - Chadha, Gavneet AU - Schwung, Andreas ID - 29900 SN - 2661-8141 T2 - Proceedings of the International Neural Networks Society TI - Traffic Sign Detection Using R-CNN ER - TY - CONF AU - Rehlaender, Philipp AU - Grote, Tobias AU - Schafmeister, Frank AU - Böcker, Joachim ID - 16441 T2 - PCIM Europe 2019 TI - Interleaved Active Clamp Forward Converters as Single Stage On-Board DC-DC Converters for EVs - an Accurate Model and Design Considerations ER - TY - CONF AB - For future Vehicle-to-Grid (V2G) applications, the six-switch full-bridge is often used as AC-DC front-end converter of a three-phase EV-charger. In many publications, the common mode (CM) noise is not taken into account. However, this must not be neglected considering the large effective capacitance, of up to 3 muF, as allowed by new standards. In this paper, different modulation techniques are investigated, related to their CM-noise. Based on electric circuit simulations, CM-filters are estimated, and the CM-currents are investigated. Accordingly, the conventional six-switch full-bridge is practically difficult to use in non-isolated chargers, because the resulting CM-currents and/or the required EMI-filter become too large, even if CM-Voltage optimized modulation techniques are used. AU - Strothmann, Benjamin AU - Schafmeister, Frank AU - Böcker, Joachim ID - 29999 T2 - PCIM Europe 2019; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management TI - Common Mode Analysis of Non-Isolated Three-Phase EV-Charger for Bi-Directional Vehicle-to-Grid Operation ER - TY - CONF AB - Utilisation of SiC semiconductors' fast switching speeds and high switching frequencies as a consequent are often in discussion. But which switching frequency is really optimal in terms of converter volume, losses and costs? Based on the example of a buck converter, this question is investigated, and a tool for loss calculation and design is described in this paper. A Pareto optimization of the converter is performed where the switching frequency is one of several design parameters. The buck converter can be realized by multiple rails interleaved, and several switches can be placed in parallel. Considered converter modes are continuous conduction mode, that allows hard-switching, ZVS, and incomplete ZVS depending on the switching frequency. Based on Pareto optimizations, a design is selected, and a laboratory sample of 5.5 kW for application in an EV battery charger is built up. Efficiencies of 99.5 % are achieved with switching frequencies of around 100 kHz. AU - Strothmann, Benjamin AU - Schafmeister, Frank AU - Böcker, Joachim ID - 30002 T2 - 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) TI - Pareto Design and Switching Frequencies for SiC MOSFETs Applied in an 11 kW Buck Converter for EV-Charging ER - TY - CONF AU - Rehlaender, Philipp AU - Grote, Tobias AU - Schafmeister, Frank AU - Böcker, Joachim ID - 16442 T2 - PCIM Europe 2019 TI - Analytical Modeling and Design of an Active Clamp Forward Converter Applied as a Single-Stage On-Board DC-DC Converter for EVs ER - TY - CONF AB - Due to recent developments in MMCs, they are used in many medium-voltage and high-power applications today, but efficient and modular solutions for high-power at low-voltage such as for electrolysis are still required. The proposed Y-MMC converts the grid AC-voltage into a DC-voltages, and an LLC converter is connected to each submodule capacitor to provide the required current to the DC-load. This paper proposes a topology that uses only half the number of submodules and moreover to reduce the effective switching frequency by a third, while preserving the same THD und output power of an YY-MMC. AU - Unruh, Roland AU - Schafmeister, Frank AU - Fröhleke, Norbert AU - Böcker, Joachim ID - 29942 SN - 978-3-8007-4938-6 T2 - PCIM Europe 2019; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management TI - MMC-Topology for High-Current and Low-Voltage Applications with Minimal Number of Submodules, Reduced Switching and Capacitor Losses ER - TY - CONF AU - Stender, Marius AU - Wallscheid, Oliver AU - Böcker, Joachim ID - 30035 T2 - 2019 IEEE 28th International Symposium on Industrial Electronics (ISIE) TI - Development of a Black-Box Two-Level IGBT Three-Phase Inverter Compensation Scheme for Electrical Drives ER - TY - CHAP AU - Ficara, Elena ED - Bubbio, Diego ED - De Cesaris , Alessandro ED - Pagano, Maurizio ED - Weslati, Hager ID - 30094 T2 - Hegel, Logic and Speculation TI - Empowering Forms. Hegel’s conception of ‘form’ and ‘formal’ ER - TY - CHAP AU - Ficara, Elena ED - Baskent , Can ED - Ferguson , Thomas Macaulay ID - 30091 T2 - Graham Priest on Paraconsistency and Dialetheism TI - Hegel and Priest on Revising Logic ER - TY - JOUR AU - Ficara, Elena ID - 30093 JF - Argumenta TI - Hegel on the Naturalness of Logic ER - TY - CONF AU - Hanke, Sören AU - Peitz, Sebastian AU - Wallscheid, Oliver AU - Böcker, Joachim AU - Dellnitz, Michael ID - 29636 T2 - 2019 IEEE International Symposium on Predictive Control of Electrical Drives and Power Electronics (PRECEDE) TI - Finite-control-set model predictive control for a permanent magnet synchronous motor application with online least squares system identification ER - TY - CONF AU - Wallscheid, Oliver AU - Shafiq, Muhammad Saad AU - Böcker, Joachim ID - 29634 T2 - 2019 IEEE 28th International Symposium on Industrial Electronics (ISIE) TI - Stator flux-based field-oriented position-sensorless control of permanent magnet synchronous motors with limited parameter knowledge ER - TY - CONF AU - Wallscheid, Oliver AU - Ngoumtsa, Etienne Florian Bouna AU - Böcker, Joachim ID - 29633 T2 - 2019 IEEE International Electric Machines & Drives Conference (IEMDC) TI - Hierarchical model predictive speed and current control of an induction machine drive with moving-horizon load torque estimator ER -