TY - CONF
AU - Herwix, Alexander
AU - zur Heiden, Philipp
ED - Bui, Tung X.
ID - 29147
SN - 978-0-9981331-5-7
T2 - Proceedings of the 55th Hawaii International Conference on System Sciences
TI - Context in Design Science Research: Taxonomy and Framework
ER -
TY - CONF
AU - zur Heiden, Philipp
AU - Beverungen, Daniel
ED - Bui, Tung X.
ID - 29148
SN - 978-0-9981331-5-7
T2 - Proceedings of the 55th Hawaii International Conference on System Sciences
TI - A Renaissance of Context in Design Science Research
ER -
TY - GEN
AU - Koldewey, Christian
AU - Dumitrescu, Roman
AU - Rabe, Martin
ID - 29149
T2 - Proceedings of the 55th Hawaii International Conference on System Sciences
TI - Introduction to the Data-driven Services in Manufacturing Minitrack - Exploring Management, Engineering, and Organizational Transformation
ER -
TY - JOUR
AU - Eke, Norbert
ID - 29155
IS - 18
JF - Literatur in Westfalen. Beiträge zur Forschung. Hg. von Walter Gödden und Arnold Maxwill.
TI - Blurred Lines. Der Reisende Michael Roes
ER -
TY - JOUR
AU - Eke, Norbert
ID - 29156
JF - Arbeitsbuch Judith Kuckart: Erzählen – Theater – Tanz. Hg. von Johanna Canaris und Stefan Elit. Berlin u.a.:
TI - Schweigen, Erzählen (und Lieben). Judith Kuckarts Roman Lenas Liebe (2002) und seine Verfilmung Bittere Kirschen (2011)
ER -
TY - JOUR
AU - Eke, Norbert
ID - 29157
JF - Theater und Krise. Paradigmen der Störung in Dramentexten und Bühnenkonzepten nach 2000. Hg. von Marta Famula und Verena Witschel.
TI - „Das Grundelement von Theater ist Verwandlung“. Heiner Müllers Idee des Theaters als Krise (und Störung).
ER -
TY - JOUR
AU - Eke, Norbert
ID - 29158
JF - Literatur in Westfalen. Beiträge zur Forschung 18. Hg. von Walter Gödden und Arnold Maxwill.
TI - „Ich glaube, der Melancholiker ist jemand, der die Fremde lies, der sie nicht gestalten will und sich von ihr nicht gestalten lässt, sondern der sie wie ein Buch aufschlägt…“. Ein Gespräch mit Michael Roes.
ER -
TY - CONF
AU - Schoormann, T.
AU - Möller, F.
AU - Szopinski, Daniel
ID - 27280
T2 - Tagungsband der 17. Internationalen Tagung Wirtschaftsinformatik 2022
TI - Exploring purposes of using taxonomies
ER -
TY - CONF
AU - Altenhöner, Reinhard
AU - Dieckmann, Lisa
AU - Münzmay, Andreas
AU - Richts-Matthaei, Kristina
AU - Röwenstrunk, Daniel
AU - Stellmacher, Martha
AU - Pratschke, Margarete
AU - Primavesi, Patrick
AU - Schulz, Christoph
ID - 27461
TI - Kultur – Daten – Kuratierung: Was Speichern Wir Und Wozu?
ER -
TY - CONF
AB - Explainability for machine learning gets more and more important in high-stakes decisions like real estate appraisal. While traditional hedonic house pricing models are fed with hard information based on housing attributes, recently also soft information has been incorporated to increase the predictive performance. This soft information can be extracted from image data by complex models like Convolutional Neural Networks (CNNs). However, these are intransparent which excludes their use for high-stakes financial decisions. To overcome this limitation, we examine if a two-stage modeling approach can provide explainability. We combine visual interpretability by Regression Activation Maps (RAM) for the CNN and a linear regression for the overall prediction. Our experiments are based on 62.000 family homes in Philadelphia and the results indicate that the CNN learns aspects related to vegetation and quality aspects of the house from exterior images, improving the predictive accuracy of real estate appraisal by up to 5.4%.
AU - Kucklick, Jan-Peter
ID - 27506
KW - Explainable Artificial Intelligence (XAI)
KW - Regression Activation Maps
KW - Real Estate Appraisal
KW - Convolutional Block Attention Module
KW - Computer Vision
T2 - 55th Annual Hawaii International Conference on System Sciences (HICSS-55)
TI - Visual Interpretability of Image-based Real Estate Appraisal
ER -
TY - CONF
AB - Accurate real estate appraisal is essential in decision making processes of financial institutions, governments, and trending real estate platforms like Zillow. One of the most important factors of a property’s value is its location. However, creating accurate quantifications of location remains a challenge. While traditional approaches rely on Geographical Information Systems (GIS), recently unstructured data in form of images was incorporated in the appraisal process, but text data remains an untapped reservoir. Our study shows that using text data in form of geolocated Wikipedia articles can increase predictive performance over traditional GIS-based methods by 8.2% in spatial out-of-sample validation. A framework to automatically extract geographically weighted vector representations for text is established and used alongside traditional structural housing features to make predictions and to uncover local patterns on sale price for real estate transactions between 2015 and 2020 in Allegheny County, Pennsylvania.
AU - Heuwinkel, Tim
AU - Kucklick, Jan-Peter
AU - Müller, Oliver
ID - 27507
KW - Real Estate Appraisal
KW - Text Regression
KW - Natural Language Processing (NLP)
KW - Location Intelligence
KW - Wikipedia
T2 - 55th Annual Hawaii International Conference on System Sciences (HICSS-55)
TI - Using Geolocated Text to Quantify Location in Real Estate Appraisal
ER -
TY - JOUR
AU - Widhalm, Alex
AU - Golla, Christian
AU - Weber, Nils
AU - Mackwitz, Peter
AU - Zrenner, Artur
AU - Meier, Cedrik
ID - 29716
IS - 4
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Electric-field-induced second harmonic generation in silicon dioxide
VL - 30
ER -
TY - CONF
AU - Abughannam, Saed
AU - Scheytt, J. Christoph
ID - 29767
T2 - International Symposium on Circuits and Systems (ISCAS 2022)
TI - Low-Power Low-Data-Rate Wireless PPM Receiver Based on 13-Bits Barker Coded SAW Correlator with Scalable Data-Rate and Sensitivity
ER -
TY - CONF
AU - Abughannam, Saed
AU - Kruse, Stephan
AU - Iftekhar, Mohammed
AU - Scheytt, J. Christoph
ID - 29770
T2 - German Microwave Conference 2022 (GeMiC 2022)
TI - Design and Measurements of a Low-power Low-Date-rate Direct-detection Wireless Receiver with Improved Co-channel Interference Robustness
ER -
TY - CHAP
AB - Die Studieneingangsphase Physik stellt für die Studienanfänger Innen einen komplexen Lernprozess mit vielfältigen Anforderungen auf fachlicher, Metakognitions- und Sozialisations-Ebene dar, der ihre akademische Identitätsbildung beeinflusst und prägt.
Ziel des Projektes Paderborner Studieneingangsphase Physik (PSΦ) ist die evidenzbasierte Gestaltung eines strukturierten Studieneinstiegs und einer in sich kohärent abgestimmten Studieneingangsphase „aus einem Guss“. Die Implementation eines neuen Übungsformats (Präsenzübungen) in den Fachvorlesungen sowie die Unterstützung der Studierenden im Bereich des selbstregulierten Lernens zeigen positive Effekte in einer erhöhten Teilnahmequote sowie Zufriedenheit der Studierenden mit der Veranstaltung, in einem aktiveren Arbeitsverhalten sowie einer höheren Bestehensquote der Klausur. Ein messbar größerer Fachwissenserwerb konnte nicht nachgewiesen werden. Auf Basis der Evidenzen konnten Stellschrauben für die Weiterentwicklung sowie für die Unterstützung der Lehrenden abgeleitet werden.
In dem Beitrag werden die Gelingensbedingungen und Strukturen für eine wirksame Zusammenarbeit von Fachdidaktik und Fachwissenschaft am Beispiel der Überarbeitung der Studieneingangsphase im Rahmen einer community of practice sowie der Wirksamkeit der Implementierung diskutiert.
AU - Bauer, Anna
AU - Woitkowski, David
AU - Reuter, Dirk
AU - Reinhold, Peter
ED - Fahr, Uwe
ED - Kenner, Alessandra
ED - Angenent, Holger
ED - Eßer-Lüghausen, Alexandra
ID - 29789
T2 - Hochschullehre erforschen.
TI - Fachliche und überfachliche Herausforderungen in der Studieneingangsphase Physik
ER -
TY - GEN
AB - We study the abilities of competitive markets to produce sufficient energy capacities to
meet a fixed energy demand. Renewable energy producers with stochastic outputs and no
variable costs compete against conventional energy producers with deterministic, pollutant
outputs and increasing marginal costs. We find that either market forces are strong enough
to serve the entire demand, or they are too weak such that the market fails and nothing is
produced. This crucially depends on the relative cost of renewable energy investments, such
that relatively cheap renewable energy causes the market to fail. Welfare analyses show that
with increasing levels of conventional energy pollution the ability of the market to produce
an ecient outcome further declines. As a policy implication, our findings refute the use of
a strategic reserve as a blackout backstop solution. Instead, a capacity mechanism consisting
of a tax-and-subsidy scheme can align the market outcome with the eficient solution for all
pollution levels and relative costs of renewable energy capacities.
AU - Block, Lukas
AU - Westbrock, Bastian
ID - 29761
KW - Renewable versus conventional energy
KW - capacity mechanisms
KW - strategic reserves
KW - capacity payments
TI - Capacity investments in a competitive energy market
ER -
TY - CONF
AU - Priefer, Jennifer
AU - Steiger, Lennart
ID - 29805
T2 - Wirtschaftsinformatik 2022 Proceedings
TI - Designing a GIS-AHP-Based Spatial Decision Support System for Discovering and Visualizing Suitable Locations for Electric Vehicle Charging Stations
VL - 31
ER -
TY - JOUR
AU - Reitz, A.
AU - Grydin, O.
AU - Schaper, M.
ID - 29809
JF - Materials Science and Engineering: A
KW - Mechanical Engineering
KW - Mechanics of Materials
KW - Condensed Matter Physics
KW - General Materials Science
SN - 0921-5093
TI - Influence of thermomechanical processing on the microstructural and mechanical properties of steel 22MnB5
VL - 838
ER -
TY - CONF
AB - The development of business models is a challenging task that can be supported with software tools. Here, existing approaches and tools do not focus on the company’s situation in which the development takes place (e.g., financial resources, product type). To tackle this challenge, we used design science research to develop a situation-specific business model development approach that contains three stages: First, existing knowledge in terms of tasks to do (e.g., analyze competitive advantage), and decisions to be made (e.g., social media marketing) are stored in repositories. Second, the knowledge is used to compose a development method based on the company’s situation. Third, the development method is enacted to develop a business model. This demonstration paper presents a tool-support called Situational Business Model Developer that supports all stages of our approach. We release the tool under open-source and evaluate it with a case study on developing business models for mobile apps.
AU - Gottschalk, Sebastian
AU - Yigitbas, Enes
AU - Nowosad, Alexander
AU - Engels, Gregor
ID - 29839
KW - Business Model Development
KW - Situational Method Engineering
KW - Tool Support
T2 - Proceedings of the 17th International Conference on Wirtschaftsinformatik
TI - Situational Business Model Developer: A Tool-support for Situation-specific Business Model Development
ER -
TY - CONF
AB - Due to the proliferation of Virtual Reality (VR) technology, VR is finding new applications in various domains, such as stock trading. Here, traders invest in stocks intending to increase their profit. For this purpose, in conventional stock trading, traders usually make use of 2D applications on desktop or laptop devices. This leads to many drawbacks such as poor visibility due to limited 2D representation, complex interaction due to indirect interaction via mouse and keyboard, or restricted support for collaboration between traders. To overcome these issues, we have developed a novel collaborative, virtual environment for stock trading, which enables stock traders to view financial information and trade stocks with other collaborators. The main results of a usability study indicate that the VR environment, compared to conventional stock trading, shows no significant advantages concerning efficiency and effectiveness, however, we could observe an increased user satisfaction and better collaboration.
AU - Yigitbas, Enes
AU - Gottschalk, Sebastian
AU - Nowosad, Alexander
AU - Engels, Gregor
ID - 29840
KW - virtual reality
KW - stock trading
KW - collaboration
KW - usability
T2 - Proceedings of the 17th International Conference on Wirtschaftsinformatik
TI - Development and Evaluation of a Collaborative Stock Trading Environment in Virtual Reality
ER -
TY - JOUR
AU - Castenow, Jannik
AU - Kling, Peter
AU - Knollmann, Till
AU - Meyer auf der Heide, Friedhelm
ID - 29843
JF - Information and Computation
KW - Computational Theory and Mathematics
KW - Computer Science Applications
KW - Information Systems
KW - Theoretical Computer Science
SN - 0890-5401
TI - A Discrete and Continuous Study of the Max-Chain-Formation Problem
ER -
TY - CONF
AU - Fockel, Markus
AU - Schubert, David
AU - Trentinaglia, Roman
AU - Schulz, Hannes
AU - Kirmair, Wolfgang
ID - 29847
T2 - Proceedings of the 10th International Conference on Model-Driven Engineering and Software Development
TI - Semi-automatic Integrated Safety and Security Analysis for Automotive Systems
ER -
TY - CONF
AU - Koch, Thorsten
AU - Trippel, Sascha
AU - Dziwok, Stefan
AU - Bodden, Eric
ID - 29844
T2 - Proceedings of the 10th International Conference on Model-Driven Engineering and Software Development
TI - Integrating Security Protocols in Scenario-based Requirements Specifications
ER -
TY - CHAP
AU - Albers, Timm
AU - Filipiak, Agnes
AU - Franzen, Katja
AU - Hellmich, Frank
ED - Schimek, B
ED - Kremsner, G
ED - Proyer, M
ED - Grubich, R
ED - Paudel, F
ED - Grubich-Müller, R
ID - 26657
T2 - Grenzen.Gänge.Zwischen.Welten. Kontroversen – Entwicklungen – Perspektiven der Inklusionsforschung
TI - Kompetenzentwicklung im inklusiven Unterricht (KinU) – eine internationale Perspektive
ER -
TY - GEN
AU - Beule, Felix
AU - Teutenberg, Dominik
AU - Meschut, Gerson
AU - Aubel, Tobias
AU - Matzenmiller, Anton
ID - 29852
T2 - 22. Kolloquium: Gemeinsame Forschung in der Klebtechnik
TI - Methodenentwicklung zur Versagensanalyse aufgrund der Aushärtung vorgeschädigter Klebverbindungen in stahlintensiven Mischbaustrukturen
ER -
TY - CONF
AU - Carillo Beber, Vinicius
AU - Nagel, Christof
AU - Mayer, Bernd
AU - Köster, Christian
AU - Matzenmiller, Anton
AU - Hecht, Matthias
AU - Baumgartner, Jörg
AU - Melz, Tobias
AU - Tews, Karina
AU - Çavdar, Serkan
AU - Meschut, Gerson
ID - 29855
T2 - 22. Kolloquium: Gemeinsame Forschung in der Klebtechnik
TI - Lebensdauerprognose für Stahlklebverbindungen bei multiaxialer Belastung mit Phasenverschiebung, veränderlicher Mittelspannung und variablen Amplituden
ER -
TY - GEN
AU - Lanza, Lukas Johannes
AU - Berger, Thomas
ID - 29835
TI - Funnel control of linear systems under output measurement losses
ER -
TY - THES
AU - Schneider, Stefan Balthasar
ID - 29672
TI - Network and Service Coordination: Conventional and Machine Learning Approaches"
ER -
TY - CONF
AB - Cyber-physical systems generate and collect huge amounts of usage data during operation. Analyzing these data may enable manufacturing companies to identify weaknesses and learn about the users of their products. Such insights are valuable in the early phases of product development like product planning, as they facilitate decision-making for product improvement. The analysis and exploitation of usage data in product planning, however, is a new task for manufacturing companies. To reduce mistakes and improve the results, companies should build upon a suitable reference process model. Unfortunately, established models for analyzing data cannot be easily applied for product planning. In this paper, we propose a reference process model for usage data-driven product planning. It builds on three well-established models for analyzing data and addresses the unique characteristics of usage data-driven product planning. Finally, we customize the model for a manufacturing company and demonstrate how it could be implemented in practice.
AU - Meyer, Maurice
AU - Wiederkehr, Ingrid
AU - Panzner, Melina
AU - Koldewey, Christian
AU - Dumitrescu, Roman
ID - 29380
T2 - Proceedings of the 55th Hawaii International Conference on System Sciences
TI - A Reference Process Model for Usage Data-Driven Product Planning
ER -
TY - CONF
AU - Yigitbas, Enes
AU - Karakaya, Kadiray
AU - Jovanovikj, Ivan
AU - Engels, Gregor
ED - Grunske, Lars
ED - Siegmund, Janet
ED - Vogelsang, Andreas
ID - 29927
T2 - Software Engineering 2022, Fachtagung des GI-Fachbereichs Softwaretechnik, 21.-25. Februar 2022, Virtuell
TI - Enhancing Human-in-the-Loop Adaptive Systems through Digital Twins and VR Interfaces
VL - {P-320}
ER -
TY - CONF
AU - Yigitbas, Enes
AU - Gorissen, Simon
AU - Weidmann, Nils
AU - Engels, Gregor
ED - Grunske, Lars
ED - Siegmund, Janet
ED - Vogelsang, Andreas
ID - 29926
T2 - Software Engineering 2022, Fachtagung des GI-Fachbereichs Softwaretechnik, 21.-25. Februar 2022, Virtuell
TI - Collaborative Software Modeling in Virtual Reality
VL - {P-320}
ER -
TY - CONF
AU - Witschen, Linus Matthias
AU - Wiersema, Tobias
AU - Reuter, Lucas David
AU - Platzner, Marco
ID - 29945
T2 - 2022 59th ACM/IEEE Design Automation Conference (DAC)
TI - Search Space Characterization for Approximate Logic Synthesis
ER -
TY - CONF
AU - Witschen, Linus Matthias
AU - Wiersema, Tobias
AU - Artmann, Matthias
AU - Platzner, Marco
ID - 29865
T2 - Design, Automation and Test in Europe (DATE)
TI - MUSCAT: MUS-based Circuit Approximation Technique
ER -
TY - GEN
AB - We extend a recent result in high-gain feedback output tracking control to achieve exact tracking within finite time, i.e., the output of a system and its relevant derivatives have certain exact values at a predefined finite time.
We propose a new funnel control scheme achieving this, whereas the error between the reference and the output evolves within prescribed bounds.
Applications of this are, for instance, linking up two parts of a train, or docking spaceships.
AU - Lanza, Lukas Johannes
ID - 29952
TI - Exact output tracking in prescribed finite time via funnel control
ER -
TY - CONF
AU - Kowatz, Jannik
AU - Teutenberg, Dominik
AU - Meschut, Gerson
ID - 29344
T2 - 22. Kolloquium Gemeinsame Forschung in der Klebtechnik
TI - Weiterentwicklung der induktiven Schnellhärtung von Klebverbindungen für robuste Fertigungsprozesse unter Berücksichtigung von serienrelevanten Einflussfaktoren
ER -
TY - CONF
AU - Chudalla, Nick
AU - Meschut, Gerson
AU - Bartley, Aurélie
AU - Wibbeke, Tim Michael
ID - 30003
T2 - 22. Kolloquium: Gemeinsame Forschung in der Klebtechnik
TI - Analyse des Versagensverhaltens geklebter Stahl-Verbindungen beim werkstoffschonenden Entfügen in der Karosserieinstandsetzung
ER -
TY - JOUR
AB - The growing demand for bandwidth and energy efficiency requires new solutions for signal detection and processing. We demonstrate a concept for high-bandwidth signal detection with low-speed photodetectors and electronics. The method is based on the parallel optical sampling of a high-bandwidth signal with sinc-pulse sequences provided by a Mach-Zehnder modulator. For the electronic detection and processing this parallel sampling enables to divide the high-bandwidth optical signal with the bandwidth B into N electrical signals with the baseband bandwidth of B/(2N) . In proof-of-concept experiments with N=3 , we present the detection of 24 GHz optical signals by detectors with a bandwidth of only 4 GHz. For ideal components, the sampling and bandwidth down-conversion does not add an excess error to the signals and even for the non-ideal components of our proof-of-concept setup, it is below 1%. Thus, the rms error for the measurement of the 24 GHz signal was reduced by a factor of about 3.4 and the effective number of bits were increased by 1.8.
AU - Meier, Janosch
AU - Singh, Karanveer
AU - Misra, Arijit
AU - Preussler, Stefan
AU - Scheytt, Christoph
AU - Schneider, Thomas
ID - 30012
JF - IEEE Photonics Journal
TI - High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics
VL - 14
ER -
TY - JOUR
AB - In this paper, the theory of phase-locking of a microwave oscillator on the interharmonics, i.e. non-integer harmonics, of the repetition rate of the optical pulse train of a mode-locked laser (MLL) is developed. A balanced optical microwave phase detector (BOMPD) is implemented using a balanced Mach-Zehnder modulator and is employed to discriminate the phase difference between the envelope of the optical pulses and the microwave oscillator. It is shown mathematically that the inherent nonlinear properties of BOMPD with respect to the microwave excitation amplitude can be used for interharmonic locking. The characteristic functions of the phase detector for interharmonic locking are derived analytically and are compared with the measurement results. An opto-electronic phase-locked loop (OEPLL) is demonstrated whose output frequency locks on interharmonics of the MLL repetition rate when an appropriate modulator bias and sufficient RF amplitude are applied. Thus, for the first time theory and experiment of reliable locking on interharmonics of the repetition rate of a MLL are presented.
AU - Bahmanian, Meysam
AU - Kress, Christian
AU - Scheytt, Christoph
ID - 30011
JF - Optics Express
TI - Locking of microwave oscillators on the interharmonics of mode-locked laser signals
VL - 14
ER -
TY - BOOK
AU - Rossel, Moritz Sebastian
AU - Meschut, Gerson
ID - 30102
SN - 978-3-86776-631-9
TI - Methodenentwicklung für die Simulation mechanischer Fügeprozesse mit besonderer Berücksichtigung fügespezifischer Reibverhältnisse
VL - 573
ER -
TY - GEN
AU - Roopa, Rajanna
ID - 30152
TI - Evaluation of Algorithms for the Node Capacitated Clique
ER -
TY - JOUR
AB - Metasurfaces provide applications for a variety of flat elements and devices due to the ability to modulate light with subwavelength structures. The working principle meanwhile gives rise to the crucial problem and challenge to protect the metasurface from dust or clean the unavoidable contaminants during daily usage. Here, taking advantage of the intelligent bioinspired surfaces which exhibit self-cleaning properties, a versatile dielectric metasurface benefiting from the obtained superhydrophilic or quasi-superhydrophobic states is shown. The design is realized by embedding the metasurface inside a large area of wettability supporting structures, which is highly efficient in fabrication, and achieves both optical and wettability functionality at the same time. The superhydrophilic state enables an enhanced optical response with water, while the quasi-superhydrophobic state imparts the fragile antennas an ability to self-clean dust contamination. Furthermore, the metasurface can be easily switched and repeated between these two wettability or functional states by appropriate treatments in a repeatable way, without degrading the optical performance. The proposed design strategy will bring new opportunities to smart metasurfaces with improved optical performance, versatility, and physical stability.
AU - Lu, Jinlong
AU - Sain, Basudeb
AU - Georgi, Philip
AU - Protte, Maximilian
AU - Bartley, Tim
AU - Zentgraf, Thomas
ID - 26747
IS - 1
JF - Advanced Optical Materials
SN - 2195-1071
TI - A Versatile Metasurface Enabling Superwettability for Self‐Cleaning and Dynamic Color Response
VL - 10
ER -
TY - GEN
AU - Korzeczek, Sebastian
ID - 30198
TI - Aufarbeitung und lmplementierung von DAG-Rider
ER -
TY - GEN
AU - Nachtigall, Marcel
ID - 30199
TI - Hybrid Routing in Three Dimensions
ER -
TY - JOUR
AB - DNA origami technology enables the folding of DNA strands into complex nanoscale shapes whose properties and interactions with molecular species often deviate significantly from that of genomic DNA. Here, we investigate the salting-out of different DNA origami shapes by the kosmotropic salt ammonium sulfate that is routinely employed in protein precipitation. We find that centrifugation in the presence of 3 M ammonium sulfate results in notable precipitation of DNA origami nanostructures but not of double-stranded genomic DNA. The precipitated DNA origami nanostructures can be resuspended in ammonium sulfate-free buffer without apparent formation of aggregates or loss of structural integrity. Even though quasi-1D six-helix bundle DNA origami are slightly less susceptible toward salting-out than more compact DNA origami triangles and 24-helix bundles, precipitation and recovery yields appear to be mostly independent of DNA origami shape and superstructure. Exploiting the specificity of ammonium sulfate salting-out for DNA origami nanostructures, we further apply this method to separate DNA origami triangles from genomic DNA fragments in a complex mixture. Our results thus demonstrate the possibility of concentrating and purifying DNA origami nanostructures by ammonium sulfate-induced salting-out.
AU - Hanke, Marcel
AU - Hansen, Niklas
AU - Chen, Ruiping
AU - Grundmeier, Guido
AU - Fahmy, Karim
AU - Keller, Adrian
ID - 30209
IS - 5
JF - International Journal of Molecular Sciences
KW - Inorganic Chemistry
KW - Organic Chemistry
KW - Physical and Theoretical Chemistry
KW - Computer Science Applications
KW - Spectroscopy
KW - Molecular Biology
KW - General Medicine
KW - Catalysis
SN - 1422-0067
TI - Salting-Out of DNA Origami Nanostructures by Ammonium Sulfate
VL - 23
ER -
TY - GEN
AU - Striewe, Marius
AU - Meschut, Gerson
AU - Schmelzle, Lars
AU - Mergheim, Julia
AU - Possart, Gunnar
AU - Steinmann, Paul
ID - 30222
T2 - 22. Kolloquium: Gemeinsame Forschung in der Klebtechnik
TI - Experimentelle und numerische Untersuchung des Einflusses variabler Betriebstemperaturen auf das Trag- und Versagensverhalten struktureller Klebverbindungen unter Crashbelastung
ER -
TY - GEN
AU - Klippstein, Sven Helge
ID - 30229
TI - Reproducibility in Polymer Laser Sintering
ER -
TY - CONF
AB - Recent reinforcement learning approaches for continuous control in wireless mobile networks have shown impressive
results. But due to the lack of open and compatible simulators, authors typically create their own simulation environments for training and evaluation. This is cumbersome and time-consuming for authors and limits reproducibility and comparability, ultimately impeding progress in the field.
To this end, we propose mobile-env, a simple and open platform for training, evaluating, and comparing reinforcement learning and conventional approaches for continuous control in mobile wireless networks. mobile-env is lightweight and implements the common OpenAI Gym interface and additional wrappers, which allows connecting virtually any single-agent or multi-agent reinforcement learning framework to the environment. While mobile-env provides sensible default values and can be used out of the box, it also has many configuration options and is easy to extend. We therefore believe mobile-env to be a valuable platform for driving meaningful progress in autonomous coordination of
wireless mobile networks.
AU - Schneider, Stefan Balthasar
AU - Werner, Stefan
AU - Khalili, Ramin
AU - Hecker, Artur
AU - Karl, Holger
ID - 30236
KW - wireless mobile networks
KW - network management
KW - continuous control
KW - cognitive networks
KW - autonomous coordination
KW - reinforcement learning
KW - gym environment
KW - simulation
KW - open source
T2 - IEEE/IFIP Network Operations and Management Symposium (NOMS)
TI - mobile-env: An Open Platform for Reinforcement Learning in Wireless Mobile Networks
ER -
TY - THES
AU - Fanasch, Patrizia
ID - 30201
TI - Governance and Reputation in the Market for Experience Goods
ER -
TY - BOOK
AB - The volume comprises a variety of research approaches that seek to explore and understand employees’ learning and development through and for work. Working life reveals challenges through technological, economic and societal development that can only rudimentarily be addressed by formal education and training. Workplace learning becomes more and more important for employees and enterprises to successfully cope with these challenges.
Workplace learning is a steadily growing field of educational research but it lacks so far a scholastic canon – there is rather a diversity of research approaches. This volume reflects this diversity by bringing together researchers from different countries and different theoretical backgrounds, presenting their current research on topics that all are relevant for understanding presages, processes and outcomes of workplace learning. Hence, this volume is of relevance for researchers as well as practitioners in the field and policy makers.
ED - Harteis, Christian
ED - Gijbels, David
ED - Kyndt, Eva
ID - 30291
KW - tivesTeam learningTeam climateSocial influences on team learningKnowledge construction in teamsLearning cultureAcknowledgement of competencesTechnology and professional learningCreation of a learning eco-systemDiversity as a challenge for organisationsHigher education as preparation for WPLSocial support in networks and professional learningvocational and professional education
SN - 2210-5549
TI - Research Approaches on Workplace Learning
ER -
TY - CHAP
AB - Multiobjective optimization plays an increasingly important role in modern
applications, where several objectives are often of equal importance. The task
in multiobjective optimization and multiobjective optimal control is therefore
to compute the set of optimal compromises (the Pareto set) between the
conflicting objectives. Since the Pareto set generally consists of an infinite
number of solutions, the computational effort can quickly become challenging
which is particularly problematic when the objectives are costly to evaluate as
is the case for models governed by partial differential equations (PDEs). To
decrease the numerical effort to an affordable amount, surrogate models can be
used to replace the expensive PDE evaluations. Existing multiobjective
optimization methods using model reduction are limited either to low parameter
dimensions or to few (ideally two) objectives. In this article, we present a
combination of the reduced basis model reduction method with a continuation
approach using inexact gradients. The resulting approach can handle an
arbitrary number of objectives while yielding a significant reduction in
computing time.
AU - Banholzer, Stefan
AU - Gebken, Bennet
AU - Dellnitz, Michael
AU - Peitz, Sebastian
AU - Volkwein, Stefan
ED - Michael, Hintermüller
ED - Roland, Herzog
ED - Christian, Kanzow
ED - Michael, Ulbrich
ED - Stefan, Ulbrich
ID - 16296
SN - 978-3-030-79392-0
T2 - Non-Smooth and Complementarity-Based Distributed Parameter Systems
TI - ROM-Based Multiobjective Optimization of Elliptic PDEs via Numerical Continuation
ER -
TY - CHAP
AB - With the ever increasing capabilities of sensors and controllers, autonomous driving is quickly becoming a reality. This disruptive change in the automotive industry poses major challenges for manufacturers as well as suppliers as entirely new design and testing strategies have to be developed to remain competitive. Most importantly, the complexity of autonomously driving vehicles in a complex, uncertain, and safety-critical environment requires new testing procedures to cover the almost infinite range of potential scenarios.
AU - Peitz, Sebastian
AU - Dellnitz, Michael
AU - Bannenberg, Sebastian
ED - Bock, H. G.
ED - Küfer, K.-H.
ED - Maas, P.
ED - Milde, A.
ED - Schulz, V.
ID - 30294
SN - 1612-3956
T2 - German Success Stories in Industrial Mathematics
TI - Efficient Virtual Design and Testing of Autonomous Vehicles
VL - 35
ER -
TY - CHAP
AB - This chapter presents a discussion of the concept of agency. Agency is understood as a multifaceted construct describing the idea that human beings make choices, act on these choices, and thereby exercise influence on their own lives as well as their environment. We argue that the concept is discussed from three different perspectives in the literature—transformational, dispositional, and relational—that are each related to learning and development in work contexts. These perspectives do not reflect incompatible positions but rather different aspects of the same phenomena. The chapter also offers an avenue of insight into empirical studies that employ agency as a central concept as well as discussions about concepts that closely overlap with ideas of human beings as agents of power and influence.
AU - Goller, Michael
AU - Paloniemi, Susanna
ID - 30289
KW - Agency Workplace learning Professional development Proactivity Self-direction
SN - 2210-5549
T2 - Research Approaches on Workplace Learning
TI - Agency: Taking Stock of Workplace Learning Research
ER -
TY - CHAP
AB - The article explores the particular quality of changes introduced through the latest wave of digital transformation of workplaces. It has effects on workflow processes, on distribution of work and tasks, and the mode of distributing working tasks, e.g. through cyber-physical systems. Hence, the changes in work are manifold and require changes in vocational education and training as well as in workplace learning. These changes reveal new challenges for research on workplace learning. Finally, conclusions for future workplace learning research will be developed.
AU - Harteis, Christian
ID - 30290
KW - Digitalisation Self organisation Distribution of labour Automation
SN - 2210-5549
T2 - Research Approaches on Workplace Learning
TI - Research on Workplace Learning in Times of Digitalisation
ER -
TY - CHAP
AU - Gräßler, Iris
AU - Pottebaum, Jens
ED - Krause, Dieter
ED - Heyden, Emil
ID - 28991
SN - 9783030783679
T2 - Design Methodology for Future Products
TI - From Agile Strategic Foresight to Sustainable Mechatronic and Cyber-Physical Systems in Circular Economies
ER -
TY - GEN
AU - Schafmeister, Frank
ID - 30347
T2 - International Conference on Electric & Electronic in Hybrid and Electric Vehicles and Electric Energy Management (EEHE),
TI - Compensation of LF Common-Mode Noise by the internal DC/DC-Stage for transformerless On-Board Chargers at Three- and Single-Phase Operation
ER -
TY - CONF
AU - Förster, Nikolas
AU - Rehlaender, Philipp
AU - Wallscheid, Oliver
AU - Schafmeister, Frank
AU - Böcker, Joachim
ID - 30349
T2 - Proc. 37th IEEE Applied Power Electronics Conference (APEC)
TI - An Open-Source Transistor Database and Toolbox as an Unified Software Engineering Tool for Managing and Evaluating Power Transistors
ER -
TY - CONF
AU - Keuck, Lukas
AU - Schafmeister, Frank
AU - Böcker, Joachim
ID - 30350
T2 - Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM)
TI - Robust Hysteresis Control for LLC Resonant Converters Using a Fully Isolated Measurement Scheme
ER -
TY - JOUR
AB - While plasmonic particles can provide optical resonances in a wide spectral range from the lower visible up to the near-infrared, often, symmetry effects are utilized to obtain particular optical responses. By breaking certain spatial symmetries, chiral structures arise and provide robust chiroptical responses to these plasmonic resonances. Here, we observe strong chiroptical responses in the linear and nonlinear optical regime for chiral L-handed helicoid-III nanoparticles and quantify them by means of an asymmetric factor, the so-called g-factor. We calculate the linear optical g-factors for two distinct chiroptical resonances to −0.12 and –0.43 and the nonlinear optical g-factors to −1.45 and −1.63. The results demonstrate that the chirality of the helicoid-III nanoparticles is strongly enhanced in the nonlinear regime.
AU - Spreyer, Florian
AU - Mun, Jungho
AU - Kim, Hyeohn
AU - Kim, Ryeong Myeong
AU - Nam, Ki Tae
AU - Rho, Junsuk
AU - Zentgraf, Thomas
ID - 30195
IS - 3
JF - ACS Photonics
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
KW - Biotechnology
KW - Electronic
KW - Optical and Magnetic Materials
SN - 2330-4022
TI - Second Harmonic Optical Circular Dichroism of Plasmonic Chiral Helicoid-III Nanoparticles
VL - 9
ER -
TY - JOUR
AB - AbstractTailored nanoscale quantum light sources, matching the specific needs of use cases, are crucial building blocks for photonic quantum technologies. Several different approaches to realize solid-state quantum emitters with high performance have been pursued and different concepts for energy tuning have been established. However, the properties of the emitted photons are always defined by the individual quantum emitter and can therefore not be controlled with full flexibility. Here we introduce an all-optical nonlinear method to tailor and control the single photon emission. We demonstrate a laser-controlled down-conversion process from an excited state of a semiconductor quantum three-level system. Based on this concept, we realize energy tuning and polarization control of the single photon emission with a control-laser field. Our results mark an important step towards tailored single photon emission from a photonic quantum system based on quantum optical principles.
AU - Jonas, B.
AU - Heinze, D.
AU - Schöll, E.
AU - Kallert, P.
AU - Langer, T.
AU - Krehs, S.
AU - Widhalm, A.
AU - Jöns, K. D.
AU - Reuter, D.
AU - Schumacher, S.
AU - Zrenner, Artur
ID - 30385
IS - 1
JF - Nature Communications
KW - General Physics and Astronomy
KW - General Biochemistry
KW - Genetics and Molecular Biology
KW - General Chemistry
SN - 2041-1723
TI - Nonlinear down-conversion in a single quantum dot
VL - 13
ER -
TY - JOUR
AU - Hoyer, Britta
AU - van Straaten, Dirk
ID - 30341
JF - Journal of Behavioral and Experimental Economics
KW - General Social Sciences
KW - Economics and Econometrics
KW - Applied Psychology
SN - 2214-8043
TI - Anonymity and Self-Expression in Online Rating Systems - An Experimental Analysis
VL - 98
ER -
TY - JOUR
AU - Praschan, Tom
AU - Heinze, Dirk
AU - Breddermann, Dominik
AU - Zrenner, Artur
AU - Walther, Andrea
AU - Schumacher, Stefan
ID - 30384
IS - 4
JF - Physical Review B
SN - 2469-9950
TI - Pulse shaping for on-demand emission of single Raman photons from a quantum-dot biexciton
VL - 105
ER -
TY - CONF
AB - Resonant evanescent coupling can be utilized to selectively excite orbital angular momentum (OAM) modes of high angular order supported by a thin circular dielectric rod. Our 2.5-D hybrid-analytical coupled mode model combines the vectorial fields associated with the fundamental TE- and TM-modes of a standard silicon photonics slab waveguide, propagating at oblique angles with respect to the rod axis, and the hybrid modes supported by the rod. One observes an efficient resonant interaction in cases where the common axial wavenumber of the waves in the slab matches the propagation constant of one or more modes of the rod. For certain modes of high angular order, the incident wave is able to transfer its directionality to the field in the fiber, exciting effectively only one of a pair of degenerate OAM modes
AU - Hammer, Manfred
AU - Ebers, Lena
AU - Förstner, Jens
ED - Andrews, David L.
ED - Galvez, Enrique J.
ED - Rubinsztein-Dunlop, Halina
ID - 30387
KW - tet_topic_waveguide
T2 - Complex Light and Optical Forces XVI
TI - Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber
ER -
TY - JOUR
AU - Cresson, Jacky
AU - Jiménez, Fernando
AU - Ober-Blöbaum, Sina
ID - 30490
JF - AIMS
TI - Continuous and discrete Noether's fractional conserved quantities for restricted calculus of variations
VL - 14(1)
ER -
TY - THES
AB - In dieser Arbeit wird die elektromagnetische Wellenausbreitung in integrierten optischen Wellenleitern mit Hilfe von halb analytischen und numerischen Simulationsmethoden untersucht. Im ersten Teil werden 2-D Si/SiO2-Wellenleiterkonfigurationen mit hohem Brechungsindexkontrast betrachtet. Die Strukturen werden mit halb geführten Wellen unter schrägen Ausbreitungswinkeln angeregt. Dadurch kann die Leistungsübertragung zu bestimmten ausgehenden Moden unterdrückt werden, wodurch vollständig verlustfreie Systeme entstehen. Zusätzlich dient die Anregung mit einem seitlich begrenzten, einfallenden Wellenbündel aus halb geführten Wellen dazu, praktisch relevantere 3-D Konfigurationen zu realisieren. Darüber hinaus wird eine schrittweise Winkelspektrum-Methode vorgestellt, die es ermöglicht, in Kombination mit voll vektoriellen 2-D Finite-Elemente-Lösungen für Teilprobleme mit geringerer Komplexität, die Wellenausbreitung in planaren, linsenförmigen Wellenleitern numerisch in drei Raumrichtungen zu berechnen. Im zweiten Teil dieser Arbeit wird die Ausbreitung in Wellenleiterstrukturen aus Lithiumniobat untersucht, welche für quantenoptische Effekte genutzt werden. Zur Detektion einzelner Photonen werden supraleitende Nanodrähte auf eindiffundierten Lithiumniobat Wellenleitern mit zusätzlicher Taperschicht aus Silizium betrachtet. Um die Wellenausbreitung in diesen 3-D Wellenleitern zu beschreiben, wird eine einseitig gerichtete Finite-Elemente „Modal Matching“ Methode eingeführt. Abschließend werden Rippenwellenleiter aus Lithiumniobat analysiert, die auf Siliziumdioxid Plattformen aufgebracht sind. Der Schwerpunkt liegt hier auf dem nichtlinearen „Parametric Down-Conversion“ Prozess, der für die Erzeugung verschränkter Photonen verwendet wird.
AU - Ebers, Lena
ID - 30722
KW - tet_topic_waveguide
TI - Semi-guided waves in integrated optical waveguide structures
ER -
TY - GEN
AB - We consider the combinatorial bandits problem with semi-bandit feedback under
finite sampling budget constraints, in which the learner can carry out its
action only for a limited number of times specified by an overall budget. The
action is to choose a set of arms, whereupon feedback for each arm in the
chosen set is received. Unlike existing works, we study this problem in a
non-stochastic setting with subset-dependent feedback, i.e., the semi-bandit
feedback received could be generated by an oblivious adversary and also might
depend on the chosen set of arms. In addition, we consider a general feedback
scenario covering both the numerical-based as well as preference-based case and
introduce a sound theoretical framework for this setting guaranteeing sensible
notions of optimal arms, which a learner seeks to find. We suggest a generic
algorithm suitable to cover the full spectrum of conceivable arm elimination
strategies from aggressive to conservative. Theoretical questions about the
sufficient and necessary budget of the algorithm to find the best arm are
answered and complemented by deriving lower bounds for any learning algorithm
for this problem scenario.
AU - Brandt, Jasmin
AU - Haddenhorst, Björn
AU - Bengs, Viktor
AU - Hüllermeier, Eyke
ID - 30724
T2 - arXiv:2202.04487
TI - Finding Optimal Arms in Non-stochastic Combinatorial Bandits with Semi-bandit Feedback and Finite Budget
ER -
TY - CHAP
AU - Temmen, Katrin
AU - Kersten, Peter
AU - Schäfer, Dominik
ID - 29950
SN - 2367-3370
T2 - Mobility for Smart Cities and Regional Development - Challenges for Higher Education
TI - Work-in-Progress: The Potential of Interactive Scripts – Supporting Conceptual Understanding and Collaborative Problem-Solving Skills
VL - 390
ER -
TY - GEN
AB - Es ist eine Reibscheibe (18) für
eine Reibungskupplung (10) vorgesehen mit einem zwischen Druckplatten (14, 16, 38) verklemmbaren Rotorring
(32), Reibbelägen zur Herstellung eines Reibschlusses des
Rotorrings (32) mit der jeweiligen Druckplatte, (14, 16, 38),
einem axial feststehenden Wellenelement (20) zur Übertragung eines Drehmoments und mindestens einem mit dem
Rotorring (32) und mit dem Wellenelement (20) im Wesentlichen drehfest verbundenen und in axialer Richtung elastisch nachgiebigen Federelement (34) zur elastischen axialen Verlagerung des Rotorrings (32) relativ zum Wellenelement (20), wobei der Rotorring (32) zwischen einer Offenstellung, in welcher das Federelement (34) entspannt ist,
und einer Schließstellung, in welcher das Federelement
(34) von mindestens einer Druckplatte (14, 16, 38) verspannt ist, im Wesentlichen in axialer Richtung parallelverschiebbar ist. Durch den über den vergleichsweise geringen
erforderlichen axialen Verlagerungsweg federnd an dem
axial unbeweglichen Wellenelement (20) angebundenen
die Reibbeläge tragenden Rotorring (32) kann bei geringen
Herstellungskosten unnötige Reibung vermieden werden,
so dass eine verschleißarme und geräuscharme lösbare
Koppelung von Bauteilen ermöglicht ist.
AU - Zimmer, Detmar
AU - Blumenthal, Lars Martin
AU - Schadomsky, Magnus
ID - 30730
TI - Reibscheibe für eine Reibungskupplung
ER -
TY - GEN
AU - Schulz, Michael
AU - Neuhaus, Uwe
AU - Kaufmann, Jens
AU - Kühnel, Stephan
AU - Alekozai, Emal M.
AU - Rohde, Heiko
AU - Hoseini, Sayed
AU - Theuerkauf, René
AU - Badura, Daniel
AU - Kerzel, Ulrich
AU - Lanquillon, Carsten
AU - Daurer, Stephan
AU - Günther, Maik
AU - Huber, Lukas
AU - Thiée, Lukas-Walter
AU - zur Heiden, Philipp
AU - Passlick, Jens
AU - Dieckmann, Jonas
AU - Schwade, Florian
AU - Seyffarth, Tobias
AU - Badewitz, Wolfgang
AU - Rissler, Raphael
AU - Sackmann, Stefan
AU - Gölzer, Philipp
AU - Welter, Felix
AU - Röth, Jochen
AU - Seidelmann, Julian
AU - Haneke, Uwe
ID - 30737
TI - DASC-PM v1.1 - Ein Vorgehensmodell für Data-Science-Projekte
ER -
TY - JOUR
AU - Riedl, Thomas
AU - Kunnathully, Vinay S.
AU - Trapp, Alexander
AU - Langer, Timo
AU - Reuter, Dirk
AU - Lindner, Jörg K. N.
ID - 30743
JF - Advanced Materials Interfaces
KW - Mechanical Engineering
KW - Mechanics of Materials
SN - 2196-7350
TI - Size‐Dependent Strain Relaxation in InAs Quantum Dots on Top of GaAs(111)A Nanopillars
ER -
TY - CONF
AU - Huber, Jonas
AU - Wallmeier, Peter
AU - Pieper, Ralf
AU - Schafmeister, Frank
AU - Kolar, Johann
ID - 30844
T2 - Proc. 9th IEEJ International Power Electronics Conference (IPEC)
TI - Comparative Evaluation of MVAC-LVDC SST and Hybrid Transformer Concepts for Future Datacenters
ER -
TY - JOUR
AB - AbstractWe consider the problem of maximization of metabolite production in bacterial cells formulated as a dynamical optimal control problem (DOCP). According to Pontryagin’s maximum principle, optimal solutions are concatenations of singular and bang arcs and exhibit the chattering or Fuller phenomenon, which is problematic for applications. To avoid chattering, we introduce a reduced model which is still biologically relevant and retains the important structural features of the original problem. Using a combination of analytical and numerical methods, we show that the singular arc is dominant in the studied DOCPs and exhibits the turnpike property. This property is further used in order to design simple and realistic suboptimal control strategies.
AU - Caillau, Jean-Baptiste
AU - Djema, Walid
AU - Gouzé, Jean-Luc
AU - Maslovskaya, Sofya
AU - Pomet, Jean-Baptiste
ID - 30861
JF - Journal of Optimization Theory and Applications
KW - Applied Mathematics
KW - Management Science and Operations Research
KW - Control and Optimization
SN - 0022-3239
TI - Turnpike Property in Optimal Microbial Metabolite Production
ER -
TY - GEN
AB - Algorithm configuration (AC) is concerned with the automated search of the
most suitable parameter configuration of a parametrized algorithm. There is
currently a wide variety of AC problem variants and methods proposed in the
literature. Existing reviews do not take into account all derivatives of the AC
problem, nor do they offer a complete classification scheme. To this end, we
introduce taxonomies to describe the AC problem and features of configuration
methods, respectively. We review existing AC literature within the lens of our
taxonomies, outline relevant design choices of configuration approaches,
contrast methods and problem variants against each other, and describe the
state of AC in industry. Finally, our review provides researchers and
practitioners with a look at future research directions in the field of AC.
AU - Schede, Elias
AU - Brandt, Jasmin
AU - Tornede, Alexander
AU - Wever, Marcel Dominik
AU - Bengs, Viktor
AU - Hüllermeier, Eyke
AU - Tierney, Kevin
ID - 30868
T2 - arXiv:2202.01651
TI - A Survey of Methods for Automated Algorithm Configuration
ER -
TY - JOUR
AU - Kobecki, Michal
AU - Scherbakov, Alexey V.
AU - Kukhtaruk, Serhii M.
AU - Yaremkevich, Dmytro D.
AU - Henksmeier, Tobias
AU - Trapp, Alexander
AU - Reuter, Dirk
AU - Gusev, Vitalyi E.
AU - Akimov, Andrey V.
AU - Bayer, Manfred
ID - 30880
IS - 15
JF - Physical Review Letters
KW - General Physics and Astronomy
SN - 0031-9007
TI - Giant Photoelasticity of Polaritons for Detection of Coherent Phonons in a Superlattice with Quantum Sensitivity
VL - 128
ER -
TY - JOUR
AU - Tuzgel, Firat
AU - Akbulut Irmak, Emine Fulya
AU - Guzel, Erkan
AU - Yucesoy, Atacan
AU - Sahin, Selim
AU - Tasdemirci, Alper
AU - Guden, Mustafa
ID - 30894
JF - Thin-Walled Structures
KW - Mechanical Engineering
KW - Building and Construction
KW - Civil and Structural Engineering
SN - 0263-8231
TI - Testing and modeling blast loading of a sandwich structure cored with a bio-inspired (balanus) core
VL - 175
ER -
TY - JOUR
AB - Federkraftbremsen sind weit verbreitete Komponenten der Antriebstechnik, ansteigend mit abnehmender Größe erreichen sie aktuell Drehzahlen von bis zu 5 000 min−1. Es besteht ein Trend zu schnell laufenden Antrieben, mit Drehzahlen von 10 000 min−1 und darüber. Bisher sind wenig Kenntnisse über das Verhalten des Reibwerts und -moments herkömmlicher Federkraftbremsen mit kostengünstigen organischen Reibbelägen bei diesen Einsatzbedingungen bekannt. Daher wurde ein Prüfstand entwickelt, der die Untersuchung bei Gleitgeschwindigkeiten von bis zu 50 m/s bei verschiedenen Lastträgheiten ermöglicht. Die Versuche zeigten, dass bei begrenzten Reibarbeiten die herkömmliche Federkraftbremse durchaus das Nennbremsmoment bei höheren Gleitgeschwindigkeiten erreicht.
AU - Schadomsky, Magnus
AU - Zimmer, Detmar
ID - 30903
IS - 04
JF - Konstruktion
KW - Federkraftbremse
KW - Gleitgeschwindigkeit
SN - 0720-5953
TI - Betrieb von Federkraftbremsen bei hohen Gleitgeschwindigkeiten
ER -
TY - JOUR
AU - Ma, Lin
AU - Pollard, Travis P.
AU - Zhang, Yong
AU - Schroeder, Marshall A.
AU - Ren, Xiaoming
AU - Han, Kee Sung
AU - Ding, Michael S.
AU - Cresce, Arthur V.
AU - Atwater, Terrill B.
AU - Mars, Julian
AU - Cao, Longsheng
AU - Steinrück, Hans-Georg
AU - Mueller, Karl T.
AU - Toney, Michael F.
AU - Hourwitz, Matt
AU - Fourkas, John T.
AU - Maginn, Edward J.
AU - Wang, Chunsheng
AU - Borodin, Oleg
AU - Xu, Kang
ID - 30910
IS - 4
JF - One Earth
KW - Earth and Planetary Sciences (miscellaneous)
KW - General Environmental Science
SN - 2590-3322
TI - Ammonium enables reversible aqueous Zn battery chemistries by tailoring the interphase
VL - 5
ER -
TY - JOUR
AB - Context: The implementation of successful measures to support immigrants' integration in cultural, social, and economic life can be considered as one of today's greatest challenges for many societies. This is especially true for adolescent immigrants who have not yet been able to finish education or gain qualifications relevant to joining the labour market. That is why many receiving countries have developed and implemented special programmes that aim at supporting immigrants' integration by facilitating their employability. Unfortunately, not much is known about the process of implementing these programmes or about how education systems, schools, and teachers are dealing with the new situation and target group. In this contribution, the implementation, development, and challenges of German Vocational Integration Classes (VIC), as an example of comparable programmes in the EU, are investigated to address this research gap. The paper considers the following exploratory research questions: (a) What challenges have been experienced by teachers and social workers in the implementation of VIC as well as in the integration of immigrants into the labour market in recent years? (b) How can these challenges be met in the long run and how should VIC be developed to better achieve its aims?
Methods: To answer these questions, a sequential qualitative study containing questionnaire and interview elements was conducted. First, teachers and social workers involved in VIC filled in a questionnaire about their experiences and experienced challenges in implementing VIC (N = 46). Then, supplementing interviews were conducted with participants from the first sample in order to generate further insights and to contextualise the findings from the first study part (N = 14).
Findings: From the respondents' answers, it appears that the VIC programme is well implemented. The results show, however, that central challenges continue to exist. This concerns, for example, legal regulations or the development of adequate curricula, but also the scope and quality of language education. In addition, problems have also been identified with regard to students' culture-specific education and their individual attitudes. These prevailing problems seem to affect schooling and educational processes. In addition, respondents report feeling left alone to deal with problems and that their experiences from their daily work in VIC and with immigrants are not sufficiently taken into account in policy and school-related decisions.
Conclusions: Although VIC seems well implemented, key challenges remain in the view of the participants. It was found that teachers cannot solve many of the identified problems themselves, as they require action at the level of policy or school organisation. For staff, this can be accompanied by increased stress and demotivation. For the young immigrants, the existing challenges can have a long-term impact on school success and transition to vocational education and training. The study thus highlights the importance of targeted and holistic strategies to support immigrant integration through education.
AU - Goller, Michael
ID - 30913
IS - 1
JF - International Journal for Research in Vocational Education and Training
KW - Immigration
KW - Educational Policy
KW - Employability
KW - Mixed Methods
KW - VET
KW - Vocational Education and Training
KW - Transitions From Education and Training to Employment
TI - Supporting Young Immigrants in Their Transition From School to Work? A Staff Perspective on Challenges of Vocational Integration Classes
VL - 9
ER -
TY - JOUR
AB - We study lobby group formation in a two-stage model where the players rst form lobby
groups that then engage in a rent-seeking contest to inuence the legislator. However, the
outcome of the contest aects all players according to the ideological distance between the
implemented policy and the players' preferences. The players can either lobby by themselves,
form a coalition of lobbyists or free ride. We nd that free coalition formation is reasonable
if either players with moderate preferences face lobby groups with extreme preferences, or if
there are two opposing coalitions with an equal number of members. Otherwise, there are
always free riders among the players.
AU - Block, Lukas
ID - 30917
JF - Quick And Easy Journal Title
KW - Group formation
KW - Rent-seeking
KW - Free riding
TI - Coalition formation versus free riding in rent-seeking contests
ER -
TY - CONF
AU - Nicolai, Marcel
AU - Zeipert, Henning
AU - Lugovtsova, Yevgeniya
AU - Bulling, Jannis
AU - Johannesmann, Sarah
AU - Prager, Jens
AU - Henning, Bernd
ID - 6590
T2 - Fortschritte der Akustik - DAGA 2022
TI - Quantification of the adhesive coupling of layered structures using guided ultrasonic waves
ER -
TY - JOUR
AB - Abstract
Batteries capable of extreme fast-charging (XFC) are a necessity for the deployment of electric vehicles. Material properties of electrodes and electrolytes along with cell parameters such as stack pressure and temperature have coupled, synergistic, and sometimes deleterious effects on fast-charging performance. We develop a new experimental testbed that allows precise and conformal application of electrode stack pressure. We focus on cell capacity degradation using single-layer pouch cells with graphite anodes, LiNi0.5Mn0.3Co0.2O2 (NMC532) cathodes, and carbonate-based electrolyte. In the tested range (10 – 125 psi), cells cycled at higher pressure show higher capacity and less capacity fading. Additionally, Li plating decreases with increasing pressure as observed with scanning electron microscopy (SEM) and optical imaging. While the loss of Li inventory from Li plating is the largest contributor to capacity fade, electrochemical and SEM examination of the NMC cathodes after XFC experiments show increased secondary particle damage at lower pressure. We infer that the better performance at higher pressure is due to more homogenous reactions of active materials across the electrode and less polarization through the electrode thickness. Our study emphasizes the importance of electrode stack pressure in XFC batteries and highlights its subtle role in cell conditions.
AU - Cao, Chuntian
AU - Steinrück, Hans-Georg
AU - Paul, Partha P
AU - Dunlop, Alison R.
AU - Trask, Stephen E.
AU - Jansen, Andrew
AU - Kasse, Robert M
AU - Thampy, Vivek
AU - Yusuf, Maha
AU - Nelson Weker, Johanna
AU - Shyam, Badri
AU - Subbaraman, Ram
AU - Davis, Kelly
AU - Johnston, Christina M
AU - Takacs, Christopher J
AU - Toney, Michael
ID - 30920
JF - Journal of The Electrochemical Society
KW - Materials Chemistry
KW - Electrochemistry
KW - Surfaces
KW - Coatings and Films
KW - Condensed Matter Physics
KW - Renewable Energy
KW - Sustainability and the Environment
KW - Electronic
KW - Optical and Magnetic Materials
SN - 0013-4651
TI - Conformal Pressure and Fast-Charging Li-Ion Batteries
VL - 169
ER -
TY - JOUR
AB - AbstractPure iron is very attractive as a biodegradable implant material due to its high biocompatibility. In combination with additive manufacturing, which facilitates great flexibility of the implant design, it is possible to selectively adjust the microstructure of the material in the process, thereby control the corrosion and fatigue behavior. In the present study, conventional hot-rolled (HR) pure iron is compared to pure iron manufactured by electron beam melting (EBM). The microstructure, the corrosion behavior and the fatigue properties were studied comprehensively. The investigated sample conditions showed significant differences in the microstructures that led to changes in corrosion and fatigue properties. The EBM iron showed significantly lower fatigue strength compared to the HR iron. These different fatigue responses were observed under purely mechanical loading as well as with superimposed corrosion influence and are summarized in a model that describes the underlying failure mechanisms.
AU - Wackenrohr, Steffen
AU - Torrent, Christof Johannes Jaime
AU - Herbst, Sebastian
AU - Nürnberger, Florian
AU - Krooss, Philipp
AU - Ebbert, Christoph
AU - Voigt, Markus
AU - Grundmeier, Guido
AU - Niendorf, Thomas
AU - Maier, Hans Jürgen
ID - 30922
IS - 1
JF - npj Materials Degradation
KW - Materials Chemistry
KW - Materials Science (miscellaneous)
KW - Chemistry (miscellaneous)
KW - Ceramics and Composites
SN - 2397-2106
TI - Corrosion fatigue behavior of electron beam melted iron in simulated body fluid
VL - 6
ER -
TY - JOUR
AB - Additive manufacturing (AM) processes are not solely used where maximum design freedom meets low lot sizes. Direct microstructure design and topology optimization can be realized concomitantly during processing by adjusting the geometry, the material composition, and the solidification behavior of the material considered. However, when complex specific requirements have to be met, a targeted part design is highly challenging. In the field of biodegradable implant surgery, a cytocompatible material of an application-adapted shape has to be characterized by a specific degradation behavior and reliably predictable mechanical properties. For instance, small amounts of oxides can have a significant effect on microstructural development, thus likewise affecting the strength and corrosion behavior of the processed material. In the present study, biocompatible pure Fe was processed using electron powder bed fusion (E-PBF). Two different modifications of the Fe were processed by incorporating Fe oxide and Ce oxide in different proportions in order to assess their impact on the microstructural evolution, the mechanical response and the corrosion behavior. The quasistatic mechanical and chemical properties were analyzed and correlated with the final microstructural appearance.
AU - Torrent, Christof J. J.
AU - Krooß, Philipp
AU - Huang, Jingyuan
AU - Voigt, Markus
AU - Ebbert, Christoph
AU - Knust, Steffen
AU - Grundmeier, Guido
AU - Niendorf, Thomas
ID - 30923
IS - 1
JF - Alloys
SN - 2674-063X
TI - Oxide Modified Iron in Electron Beam Powder Bed Fusion—From Processability to Corrosion Properties
VL - 1
ER -
TY - JOUR
AU - Schall, Christoph Wilhelm Theodor
AU - Schöppner, Volker
ID - 29947
IS - 3
JF - Polymer Engineering and Science
KW - Computing Resources Provided by the Paderborn Center for Parallel Computing
TI - Measurement of material degradation in dependence of shear rate, temperature, and residence time
VL - 62
ER -
TY - JOUR
AB - The presented paper aims to characterize the damage and fracture behavior of HX340LAD Micro-Alloyed steels using small punch test. Variations with respect to punch geometries and cutting clearance are made to describe the damage behavior of the material under different loading conditions. Experimental investigations are conducted to identify the crack initiation in the specimens. Furthermore, the numerical FEM simulations are performed to identify the stress state at crack initiation. It is shown that different stress states from shear to biaxial tension can be achieved by changing the geometries of punch and varying the cutting clearance. Moreover, it is presented how changing the configurations can influence the stress state variables: Triaxiality and lode angle parameter.
AU - Otroshi, Mortaza
AU - Meschut, Gerson
ID - 27186
IS - c
JF - Engineering Failure Analysis
KW - Ductile damage
KW - stress state
KW - small punch test
KW - triaxiality
KW - lode angle parameter
SN - 1350-6307
TI - Influence of cutting clearance and punch geometry on the stress state in small punch test
VL - 136
ER -
TY - CONF
AU - Chudalla, Nick
AU - Teutenberg, Dominik
AU - Meschut, Gerson
AU - Schneider, Miriam
AU - Smart, Dominik
ID - 30004
T2 - 22. Kolloquium: Gemeinsame Forschung in der Klebtechnik
TI - Systematisierung einer rechnergestützten Auswertemethode zur Versagensanalyse geklebter Verbindungen
ER -
TY - JOUR
AU - Reineke Matsudo, Bernhard
AU - Sain, Basudeb
AU - Carletti, Luca
AU - Zhang, Xue
AU - Gao, Wenlong
AU - Angelis, Costantino
AU - Huang, Lingling
AU - Zentgraf, Thomas
ID - 29902
IS - 12
JF - Advanced Science
KW - General Physics and Astronomy
KW - General Engineering
KW - Biochemistry
KW - Genetics and Molecular Biology (miscellaneous)
KW - General Materials Science
KW - General Chemical Engineering
KW - Medicine (miscellaneous)
SN - 2198-3844
TI - Efficient Frequency Conversion with Geometric Phase Control in Optical Metasurfaces
VL - 9
ER -
TY - JOUR
AU - Vorderbrüggen, Julian
AU - Köhler, Daniel
AU - Grüber, Bernd
AU - Troschitz, Juliane
AU - Gude, Maik
AU - Meschut, Gerson
ID - 30911
JF - Composite Structures
KW - Civil and Structural Engineering
KW - Ceramics and Composites
SN - 0263-8223
TI - Development of a rivet geometry for solid self-piercing riveting of thermally loaded CFRP-metal joints in automotive construction
VL - 291
ER -
TY - JOUR
AB - The process chain for the manufacturing of sheet metal components in mass production includes various cutting and forming operations, which influence the resulting properties of the parts and therefore subsequent manufacturing steps, such as clamping and joining. It is shown that clamping of the components leads to superimposed residual stresses and geometry changes. Therefore, the part properties differ from the initial state of the semifinished products, which has to be considered in the design of clinched joints. This paper presents an approach for coupled determination of the properties of semifinished and finished parts during deep drawing and clamping as well as their effects on the joint quality during clinching. One method for the effective and efficient determination of the properties of semifinished products and components during production is using process data from the preceding manufacturing processes, which is concretely presented in this work. In addition to the interconnection of the entire production chain, it is necessary to define relevant process data for each individual manufacturing step and to correlate the data with the material properties reliably. Therefore, the cross-process interactions of different steps of the process chain for the manufacturing of sheet metal components and the effect of process variations on subsequent manufacturing steps are investigated. Consequently, the boundary conditions for a mechanical joining process based on data from preceding process steps can be predicted.
AU - Heyser, Per
AU - Wiesenmayer, S
AU - Frey, P
AU - Nehls, T
AU - Scharr, C
AU - Flügge, W
AU - Merklein, M
AU - Meschut, Gerson
ID - 30904
JF - Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
KW - Mechanical Engineering
KW - General Materials Science
SN - 1464-4207
TI - Consideration of the manufacturing history of sheet metal components for the adaptation of a clinching process
ER -
TY - CHAP
AU - Yigitbas, Enes
AU - Sauer, Stefan
AU - Engels, Gregor
ED - Vogel-Heuser, Birgit
ED - Wimmer, Manuel
ID - 29928
T2 - Digital Transformation: Core Technologies and Emerging Topics from a Computer Science Perspective
TI - Self-Adaptive Digital Assistance Systems for Work 4.0
ER -
TY - JOUR
AU - Gao, Wenlong
AU - Sain, Basudeb
AU - Zentgraf, Thomas
ID - 30964
IS - 4
JF - Physical Review Applied
KW - General Physics and Astronomy
SN - 2331-7019
TI - Spin-Orbit Interaction of Light Enabled by Negative Coupling in High-Quality-Factor Optical Metasurfaces
VL - 17
ER -
TY - JOUR
AB - We study output reference tracking of systems with high relative degree via output feedback only; this is, tracking where the output derivatives are unknown.
To this end, we prove that the conjunction of the funnel pre-compensator with a minimum phase system of arbitrary relative degree yields a system of the same relative degree which is minimum phase as well.
The error between the original system's output and the pre-compensator's output evolves within a prescribed performance funnel; and moreover, the derivatives of the funnel pre-compensator's output are known explicitly.
Therefore, output reference tracking with prescribed transient behavior of the tracking error is possible without knowledge of the derivatives of the original system's output; via funnel control schemes for instance.
AU - Lanza, Lukas Johannes
ID - 23398
JF - Mathematics of Control, Signals, and Systems
TI - Output feedback control with prescribed performance via funnel pre-compensator
ER -
TY - CONF
AU - Hansmeier, Tim
AU - Platzner, Marco
ID - 30971
SN - 0302-9743
T2 - Applications of Evolutionary Computation, EvoApplications 2022, Proceedings
TI - Integrating Safety Guarantees into the Learning Classifier System XCS
VL - 13224
ER -
TY - JOUR
AU - Chudalla, Nick
AU - Meschut, Gerson
AU - Bartley, Aurélie
AU - Wibbeke, Tim Michael
ID - 30915
IS - 4
JF - adhäsion KLEBEN & DICHTEN
KW - Polymers and Plastics
KW - General Chemical Engineering
KW - General Chemistry
SN - 1619-1919
TI - Bauteilschonendes Entfügen struktureller Klebverbindungen durch Kälte
VL - 66
ER -
TY - JOUR
AU - Feldmann, Michael
AU - Padalkin, Andreas
AU - Scheideler, Christian
AU - Dolev, Shlomi
ID - 31060
IS - 4
JF - J. Comput. Biol.
TI - Coordinating Amoebots via Reconfigurable Circuits
VL - 29
ER -
TY - JOUR
AU - Xin, Yang
AU - Piskunen, Petteri
AU - Suma, Antonio
AU - Li, Changyong
AU - Ijäs, Heini
AU - Ojasalo, Sofia
AU - Seitz, Iris
AU - Kostiainen, Mauri A.
AU - Grundmeier, Guido
AU - Linko, Veikko
AU - Keller, Adrian
ID - 30738
JF - Small
KW - Biomaterials
KW - Biotechnology
KW - General Materials Science
KW - General Chemistry
SN - 1613-6810
TI - Environment‐Dependent Stability and Mechanical Properties of DNA Origami Six‐Helix Bundles with Different Crossover Spacings
VL - 18
ER -
TY - CONF
AU - Wende, Marc
AU - Fischer, Florian
AU - Kenig, Eugeny
ID - 31069
T2 - Jahrestreffen der ProcessNet Fachgruppen Fluidverfahrenstechnik und Hochdruckverfahrenstechnik
TI - Experimentelle Untersuchung und Modellvalidierung zur Gravidestillation
ER -
TY - GEN
AU - Hopp, Matthias
AU - Tölle, Lisa
ID - 31789
T2 - Journal of Applied Polymer Science
TI - Influence of process parameters on the formation of inhalable fiber dust during shredding for mechanical recycling of fiber‐reinforced organo sheets
ER -
TY - GEN
AU - Hopp, Matthias
AU - Tölle, Lisa
AU - Bünger, J.
AU - Westphal, G.
AU - Rosenkranz, N.
AU - Monsé, C.
ID - 31788
T2 - Kunststoffe international
TI - Fiber Dust Formation during the Recycling of FRP
ER -
TY - GEN
AU - Hopp, Matthias
AU - Tölle, Lisa
AU - Bünger, J.
AU - Westphal, G.
AU - Rosenkranz, N.
AU - Monsé, C.
ID - 31787
T2 - Kunststoffe
TI - Faserstäube beim FVK-Recycling
ER -
TY - JOUR
AB - Encrypting data before sending it to the cloud ensures data confidentiality but requires the cloud to compute on encrypted data. Trusted execution environments, such as Intel SGX enclaves, promise to provide a secure environment in which data can be decrypted and then processed. However, vulnerabilities in the executed program give attackers ample opportunities to execute arbitrary code inside the enclave. This code can modify the dataflow of the program and leak secrets via SGX side channels. Fully homomorphic encryption would be an alternative to compute on encrypted data without data leaks. However, due to its high computational complexity, its applicability to general-purpose computing remains limited. Researchers have made several proposals for transforming programs to perform encrypted computations on less powerful encryption schemes. Yet current approaches do not support programs making control-flow decisions based on encrypted data.
We introduce the concept of
dataflow authentication
(DFAuth) to enable such programs. DFAuth prevents an adversary from arbitrarily deviating from the dataflow of a program. Our technique hence offers protections against the side-channel attacks described previously. We implemented two flavors of DFAuth, a Java bytecode-to-bytecode compiler, and an SGX enclave running a small and program-independent trusted code base. We applied DFAuth to a neural network performing machine learning on sensitive medical data and a smart charging scheduler for electric vehicles. Our transformation yields a neural network with encrypted weights, which can be evaluated on encrypted inputs in
\( 12.55 \,\mathrm{m}\mathrm{s} \)
. Our protected scheduler is capable of updating the encrypted charging plan in approximately 1.06 seconds.
AU - Fischer, Andreas
AU - Fuhry, Benny
AU - Kußmaul, Jörn
AU - Janneck, Jonas
AU - Kerschbaum, Florian
AU - Bodden, Eric
ID - 31844
IS - 3
JF - ACM Transactions on Privacy and Security
KW - Safety
KW - Risk
KW - Reliability and Quality
KW - General Computer Science
SN - 2471-2566
TI - Computation on Encrypted Data Using Dataflow Authentication
VL - 25
ER -