TY - JOUR
AU - Pfeifer, Florian
AU - Knorr, Lukas
AU - Schlosser, Florian
AU - Marten, Thorsten
AU - Tröster, Thomas
ID - 46486
IS - 3
JF - Journal of Sustainable Development of Energy, Water and Environment Systems
KW - Energy Engineering and Power Technology
KW - Water Science and Technology
KW - Environmental Science (miscellaneous)
KW - Renewable Energy
KW - Sustainability and the Environment
SN - 1848-9257
TI - Ecological and Economic Feasibility of Inductive Heating for Sustainable Press Hardening Processes
VL - 11
ER -
TY - CONF
AU - Elsner, Julia
AU - Tenberge, Claudia
AU - Fechner, Sabine
ED - van Vorst, Helena
ID - 45371
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt
TI - Videoanalyse des Modellierprozesses von Grundschüler*innen
VL - 43
ER -
TY - GEN
AU - Kundisch, Dennis
ID - 46491
TI - #DIGITALENTS - Digital Talents Programm geht in die zweite Runde
VL - 1
ER -
TY - JOUR
AU - Kempkes, J. P.
AU - Kreuzhage, K.
AU - Kundisch, Dennis
AU - Seutter, Janina
AU - Weskamp, Christoph
ID - 45656
JF - Kultur Management Network Magazin
TI - Digitale Transformation im Theater – Mittels Besucherforschung und Entscheidungsunterstützung zur besseren Angebotsgestaltung
VL - 172
ER -
TY - CONF
AU - Gräßler, Iris
AU - Wiechel, Dominik
ID - 46502
T2 - 2023 18th Annual System of Systems Engineering Conference (SoSe)
TI - Customized impact analyses for technical engineering changes
ER -
TY - JOUR
AB -
Purpose
The purpose of this study is to investigate the manufacturability of Fe-3Si lattice structures and the resulting mechanical properties. This study could lead to the successful processing of squirrel cage conductors (a lattice structure by design) of an induction motor by additive manufacturing in the future.
Design/methodology/approach
The compression behaviour of two lattice structures where struts are arranged in a face-centred cubic position and vertical edges (FCCZ), and struts are placed at body-centred cubic (BCC) positions, prepared by laser powder bed fusion (LPBF), is explored. The experimental investigations are supported by finite element method (FEM) simulations.
Findings
The FCCZ lattice structure presents a peak in the stress-strain curve, whereas the BCC lattice structure manifests a plateau. The vertical struts aligned along the compression direction lead to a significant increase in the load-carrying ability of FCCZ lattice structures compared to BCC lattice structures. This results in a peak in the stress-strain curve. However, the BCC lattice structure presents the bending of struts with diagonal struts carrying the major loads with struts near the faceplate receiving the least load. A high concentration of geometrically necessary dislocations (GNDs) near the grain boundaries along cell formation is observed in the microstructure.
Originality/value
To the best of the authors’ knowledge, this is the first study on additive manufacturing of Fe-3Si lattice structures. Currently, there are no investigations in the literature on the manufacturability and mechanical properties of Fe-3Si lattice structures.
AU - Pramanik, Sudipta
AU - Hoyer, Kay-Peter
AU - Schaper, Mirko
ID - 46503
IS - 6
JF - Rapid Prototyping Journal
KW - Industrial and Manufacturing Engineering
KW - Mechanical Engineering
SN - 1355-2546
TI - Experimental and finite element method investigation on the compression behaviour of FCCZ and BCC lattice structures of additively manufactured Fe-3Si samples
VL - 29
ER -
TY - JOUR
AU - Pramanik, Sudipta
AU - Milaege, Dennis
AU - Hein, Maxwell
AU - Andreiev, Anatolii
AU - Schaper, Mirko
AU - Hoyer, Kay-Peter
ID - 46507
IS - 14
JF - Advanced Engineering Materials
KW - Condensed Matter Physics
KW - General Materials Science
SN - 1438-1656
TI - An Experimental and Computational Modeling Study on Additively Manufactured Micro‐Architectured Ti–24Nb–4Zr–8Sn Hollow‐Strut Lattice Structures
VL - 25
ER -
TY - GEN
AU - Andreiev, Anatolii
AU - Hoyer, Kay-Peter
AU - Hengsbach, Florian
AU - Haase, Michael
AU - Schaper, Mirko
ID - 46504
TI - Powder Bed Fusion of Soft-Magnetic Iron-Silicon-Based Alloys: Advantages and Challenges
ER -
TY - CONF
AB - Purpose: Data integration and applications across knowledge graphs (KGs) rely heavily on the discovery of links between resources within these KGs. Geospatial link discovery algorithms have to deal with millions of point sets containing billions of points.
Methodology: To speed up the discovery of geospatial links, we propose COBALT. COBALT combines the content measures with R-tree indexing. The content measures are based on the area, diagonal and distance of the minimum bounding boxes of the polygons which speeds up the process but is not perfectly accurate. We thus propose two polygon splitting approaches for improving the accuracy of COBALT.
Findings: Our experiments on real-world datasets show that COBALT is able to speed up the topological relation discovery over geospatial KGs by up to 1.47 × 104 times over state-of-the-art linking algorithms while maintaining an F-Measure between 0.7 and 0.9 depending on the relation. Furthermore, we were able to achieve an F-Measure of up to 0.99 by applying our polygon splitting approaches before applying the content measures.
Value: The process of discovering links between geospatial resources can be significantly faster by sacrificing the optimality of the results. This is especially important for real time data-driven applications such as emergency response, location-based services and traffic management. In future work, additional measures, like the location of polygons or the name of the entity represented by the polygon, could be integrated to further improve the accuracy of the results.
AU - Becker, Alexander
AU - Ahmed, Abdullah Fathi Ahmed
AU - Sherif, Mohamed
AU - Ngonga Ngomo, Axel-Cyrille
ID - 46514
KW - ahmed becker dice ngonga sail sherif
T2 - SEMANTiCS
TI - COBALT: A Content-Based Similarity Approach for Link Discovery over Geospatial Knowledge Graphs
ER -
TY - JOUR
AU - Ahmed, Abdullah Fathi
AU - Sherif, Mohamed Ahmed
AU - Ngomo, Axel-Cyrille Ngonga
ID - 46517
JF - IEEE Access
KW - General Engineering
KW - General Materials Science
KW - General Computer Science
KW - Electrical and Electronic Engineering
SN - 2169-3536
TI - NELLIE: Never-Ending Linking for Linked Open Data
ER -
TY - CHAP
AB - Linked knowledge graphs build the backbone of many data-driven applications such as search engines, conversational agents and e-commerce solutions. Declarative link discovery frameworks use complex link specifications to express the conditions under which a link between two resources can be deemed to exist. However, understanding such complex link specifications is a challenging task for non-expert users of link discovery frameworks. In this paper, we address this drawback by devising NMV-LS, a language model-based verbalization approach for translating complex link specifications into natural language. NMV-LS relies on the results of rule-based link specification verbalization to apply continuous training on T5, a large language model based on the Transformerarchitecture. We evaluated NMV-LS on English and German datasets using well-known machine translation metrics such as BLUE, METEOR, ChrF++ and TER. Our results suggest that our approach achieves a verbalization performance close to that of humans and outperforms state of the art approaches. Our source code and datasets are publicly available at https://github.com/dice-group/NMV-LS.
AU - Ahmed, Abdullah Fathi Ahmed
AU - Firmansyah, Asep Fajar
AU - Sherif, Mohamed
AU - Moussallem, Diego
AU - Ngonga Ngomo, Axel-Cyrille
ID - 46516
SN - 0302-9743
T2 - Natural Language Processing and Information Systems
TI - Explainable Integration of Knowledge Graphs Using Large Language Models
ER -
TY - CONF
AU - Vogelsang, Christoph
AU - Janzen, Thomas
AU - Meier, Jana
AU - Wotschel, Philipp
ID - 46522
TI - „Die Prüfungen werden mich sicherlich nicht zu einer besseren Lehrkraft machen.“ Wie beurteilen Studierende Prüfungen und Feedback im Lehramtsstudium?
ER -
TY - CONF
AU - Wotschel, Philipp
AU - Vogelsang, Christoph
AU - Janzen, Thomas
AU - Meier, Jana
ID - 46524
TI - Als Lehrkraft gut beraten? Entwicklung und Erprobung eines handlungsnahen Prüfungsformates zur Erfassung von Beratungskompetenz von Lehramtsstudierenden
ER -
TY - CONF
AB - Purpose: This study addresses the limitations of current short abstracts of DBpedia entities, which often lack a comprehensive overview due to their creating method (i.e., selecting the first two-three sentences from the full DBpedia abstracts).
Methodology: We leverage pre-trained language models to generate abstractive summaries of DBpedia abstracts in six languages (English, French, German, Italian, Spanish, and Dutch). We performed several experiments to assess the quality of generated summaries by language models. In particular, we evaluated the generated summaries using human judgments and automated metrics (Self-ROUGE and BERTScore). Additionally, we studied the correlation between human judgments and automated metrics in evaluating the generated summaries under different aspects: informativeness, coherence, conciseness, and fluency.
Findings: Pre-trained language models generate summaries more concise and informative than existing short abstracts. Specifically, BART-based models effectively overcome the limitations of DBpedia short abstracts, especially for longer ones.
Moreover, we show that BERTScore and ROUGE-1 are reliable metrics for assessing the informativeness and coherence of the generated summaries with respect to the full DBpedia abstracts. We also find a negative correlation between conciseness and human ratings. Furthermore, fluency evaluation remains challenging without human judgment.
Value: This study has significant implications for various applications in machine learning and natural language processing that rely on DBpedia resources. By providing succinct and comprehensive summaries, our approach enhances the quality of DBpedia abstracts and contributes to the semantic web community
AU - Zahera, Hamada Mohamed Abdelsamee
AU - Vitiugin, Fedor
AU - Sherif, Mohamed
AU - Castillo, Carlos
AU - Ngonga Ngomo, Axel-Cyrille
ID - 46518
KW - dice enexa kiam ngonga porque sherif zahera
T2 - SEMANTiCS
TI - Using Pre-trained Language Models for Abstractive DBpedia Summarization: A Comparative Study
ER -
TY - DATA
AB - Graffiti is an urban phenomenon that is increasingly attracting the interest of the sciences. To the best of our knowledge, no suitable data corpora are available for systematic research until now. The Information System Graffiti in Germany project (Ingrid) closes this gap by dealing with graffiti image collections that have been made available to the project for public use. Within Ingrid, the graffiti images are collected, digitized and annotated. With this work, we aim to support the rapid access to a comprehensive data source on Ingrid targeted especially by researchers. In particular, we present IngridKG, an RDF knowledge graph of annotated graffiti, abides by the Linked Data and FAIR principles. We weekly update IngridKG by augmenting the new annotated graffiti to our knowledge graph. Our generation pipeline applies RDF data conversion, link discovery and data fusion approaches to the original data. The current version of IngridKG contains 460,640,154 triples and is linked to 3 other knowledge graphs by over 200,000 links. In our use case studies, we demonstrate the usefulness of our knowledge graph for different applications.
AU - Sherif, Mohamed
AU - Morim da Silva, Ana Alexandra
AU - Pestryakova, Svetlana
AU - Ahmed, Abdullah Fathi Ahmed
AU - Niemann, Sven
AU - Ngonga Ngomo, Axel-Cyrille
ID - 45558
TI - IngridKG: A FAIR Knowledge Graph of Graffiti
ER -
TY - JOUR
AB - Multiprotein adsorption from complex body fluids represents a highly important and complicated phenomenon in medicine. In this work, multiprotein adsorption from diluted human serum at gold and oxidized iron surfaces is investigated at different serum concentrations and pH values. Adsorption-induced changes in surface topography and the total amount of adsorbed proteins are quantified by atomic force microscopy (AFM) and polarization-modulation infrared reflection absorption spectroscopy (PM-IRRAS), respectively. For both surfaces, stronger protein adsorption is observed at pH 6 compared to pH 7 and pH 8. PM-IRRAS furthermore provides some qualitative insights into the pH-dependent alterations in the composition of the adsorbed multiprotein films. Changes in the amide II/amide I band area ratio and in particular side-chain IR absorption suggest that the increased adsorption at pH 6 is accompanied by a change in protein film composition. Presumably, this is mostly driven by the adsorption of human serum albumin, which at pH 6 adsorbs more readily and thereby replaces other proteins with lower surface affinities in the resulting multiprotein film.
AU - Huang, Jingyuan
AU - Qiu, Yunshu
AU - Lücke, Felix
AU - Su, Jiangling
AU - Grundmeier, Guido
AU - Keller, Adrian
ID - 46542
IS - 16
JF - Molecules
KW - Chemistry (miscellaneous)
KW - Analytical Chemistry
KW - Organic Chemistry
KW - Physical and Theoretical Chemistry
KW - Molecular Medicine
KW - Drug Discovery
KW - Pharmaceutical Science
SN - 1420-3049
TI - Multiprotein Adsorption from Human Serum at Gold and Oxidized Iron Surfaces Studied by Atomic Force Microscopy and Polarization-Modulation Infrared Reflection Absorption Spectroscopy
VL - 28
ER -
TY - JOUR
AB - The influence of nanoscale surface topography on protein adsorption is highly important for numerous applications in medicine and technology. Herein, ferritin adsorption at flat and nanofaceted, single-crystalline Al2O3 surfaces is investigated using atomic force microscopy and X-ray photoelectron spectroscopy. The nanofaceted surfaces are generated by the thermal annealing of Al2O3 wafers at temperatures above 1000 °C, which leads to the formation of faceted saw-tooth-like surface topographies with periodicities of about 160 nm and amplitudes of about 15 nm. Ferritin adsorption at these nanofaceted surfaces is notably suppressed compared to the flat surface at a concentration of 10 mg/mL, which is attributed to lower adsorption affinities of the newly formed facets. Consequently, adsorption is restricted mostly to the pattern grooves, where the proteins can maximize their contact area with the surface. However, this effect depends on the protein concentration, with an inverse trend being observed at 30 mg/mL. Furthermore, different ferritin adsorption behavior is observed at topographically similar nanofacet patterns fabricated at different annealing temperatures and attributed to different step and kink densities. These results demonstrate that while protein adsorption at solid surfaces can be notably affected by nanofacet patterns, fine-tuning protein adsorption in this way requires the precise control of facet properties.
AU - Pothineni, Bhanu K.
AU - Kollmann, Sabrina
AU - Li, Xinyang
AU - Grundmeier, Guido
AU - Erb, Denise J.
AU - Keller, Adrian
ID - 46543
IS - 16
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 - Adsorption of Ferritin at Nanofaceted Al2O3 Surfaces
VL - 24
ER -
TY - CONF
AU - Kouagou, N’Dah Jean
AU - Heindorf, Stefan
AU - Demir, Caglar
AU - Ngomo, Axel-Cyrille Ngonga
ID - 46459
T2 - NeSy
TI - Neural Class Expression Synthesis (Extended Abstract)
VL - 3432
ER -
TY - CHAP
AB - Indonesian is classified as underrepresented in the Natural Language Processing (NLP) field, despite being the tenth most spoken language in the world with 198 million speakers. The paucity of datasets is recognized as the main reason for the slow advancements in NLP research for underrepresented languages. Significant attempts were made in 2020 to address this drawback for Indonesian. The Indonesian Natural Language Understanding (IndoNLU) benchmark was introduced alongside IndoBERT pre-trained language model. The second benchmark, Indonesian Language Evaluation Montage (IndoLEM), was presented in the same year. These benchmarks support several tasks, including Named Entity Recognition (NER). However, all NER datasets are in the public domain and do not contain domain-specific datasets. To alleviate this drawback, we introduce IndQNER, a manually annotated NER benchmark dataset in the religious domain that adheres to a meticulously designed annotation guideline. Since Indonesia has the world’s largest Muslim population, we build the dataset from the Indonesian translation of the Quran. The dataset includes 2475 named entities representing 18 different classes. To assess the annotation quality of IndQNER, we perform experiments with BiLSTM and CRF-based NER, as well as IndoBERT fine-tuning. The results reveal that the first model outperforms the second model achieving 0.98 F1 points. This outcome indicates that IndQNER may be an acceptable evaluation metric for Indonesian NER tasks in the aforementioned domain, widening the research’s domain range.
AU - Gusmita, Ria Hari
AU - Firmansyah, Asep Fajar
AU - Moussallem, Diego
AU - Ngonga Ngomo, Axel-Cyrille
ID - 46572
SN - 0302-9743
T2 - Natural Language Processing and Information Systems
TI - IndQNER: Named Entity Recognition Benchmark Dataset from the Indonesian Translation of the Quran
ER -
TY - JOUR
AB - AbstractExternal visualization (i.e., physically embodied visualization) is central to the teaching and learning of mathematics. As external visualization is an important part of mathematics at all levels of education, it is diverse, and research on external visualization has become a wide and complex field. The aim of this scoping review is to characterize external visualizations in recent mathematics education research in order to develop a common ground and guide future research. A qualitative content analysis of the full texts of 130 studies published between 2018 and 2022 applied a deductive-inductive coding procedure to assess four dimensions: visualization product or process, type of visualization, media, and purpose. The analysis revealed different types of external visualizations including visualizations with physical resemblance ranging from pictorial to abstract visualizations as well as three types of visualizations with structural resemblance: length, area, and relational visualizations. Future research should include measures of visualization products or processes to help explain the demands and affordances that different types of visualizations present to learners and teachers.
AU - Schoenherr, Johanna
AU - Schukajlow, Stanislaw
ID - 46569
JF - ZDM – Mathematics Education
KW - General Mathematics
KW - Education
SN - 1863-9690
TI - Characterizing external visualization in mathematics education research: a scoping review
ER -
TY - CHAP
AU - Vochatzer, Stefanie
ED - Bentz , Julia
ID - 46560
T2 - Creative Approaches to Climate and Peace Education. An Educationr’s Guide to Using Storytelling and Art
TI - My first contact with the Foodsharing Initiative
ER -
TY - GEN
AB - We study the effect of education on health (hospital stays, number of diagnosed conditions, self-rated poor health, and obesity) over the life-cycle in Germany, using compulsory schooling reforms as a source of exogenous variation. Our results suggest a positive correlation of health and education which increases over the life-cycle. We do not, however, find any positive local average treatment effects of an additional year of schooling on health or health care utilization for individuals up to age 79. An exception is obesity, where positive effects of schooling start to be visible around age 60 and become very large in age group 75-79. The results in age group 75-79 need to be interpreted with caution, however, due to small sample size and possible problems of attrition.
AU - Schmitz, Hendrik
AU - Tawiah, Beatrice Baaba
ID - 46534
KW - Education
KW - health
KW - life-cycle effects
KW - compulsory schooling
TI - Life-cycle health effects of compulsory schooling
VL - 1006
ER -
TY - CONF
AU - Baci, Alkid
AU - Heindorf, Stefan
ID - 46575
T2 - CIKM
TI - Accelerating Concept Learning via Sampling
ER -
TY - GEN
AU - Freise, Diana
AU - Schiele, Valentin
AU - Schmitz, Hendrik
ID - 46521
KW - General Earth and Planetary Sciences
KW - General Environmental Science
SN - 1556-5068
TI - Housing Situations and Local COVID-19 Infection Dynamics – A Case Study With Small-Area Data
ER -
TY - GEN
AB - The Koopman operator has become an essential tool for data-driven analysis, prediction and control of complex systems, the main reason being the enormous potential of identifying linear function space representations of nonlinear
dynamics from measurements. Until now, the situation where for large-scale systems, we (i) only have access to partial observations (i.e., measurements, as is very common for experimental data) or (ii) deliberately perform coarse
graining (for efficiency reasons) has not been treated to its full extent. In this paper, we address the pitfall associated with this situation, that the classical EDMD algorithm does not automatically provide a Koopman operator approximation for the underlying system if we do not carefully select the number of observables. Moreover, we show that symmetries in the system dynamics can be carried over to the Koopman operator, which allows us to massively increase the model efficiency. We also briefly draw a connection to domain decomposition techniques for partial differential equations and present numerical evidence using the Kuramoto--Sivashinsky equation.
AU - Peitz, Sebastian
AU - Harder, Hans
AU - Nüske, Feliks
AU - Philipp, Friedrich
AU - Schaller, Manuel
AU - Worthmann, Karl
ID - 46579
T2 - arXiv:2307.15325
TI - Partial observations, coarse graining and equivariance in Koopman operator theory for large-scale dynamical systems
ER -
TY - GEN
AB - We study the effect of education on vaccination against COVID-19 and influenza in Germany and Europe. Our identification strategy makes use of changes in compulsory schooling laws and allows to estimate local average treatment effects for individuals between 59 and 91 years of age. We find no significant effect of an additional year of schooling on vaccination status in Germany. Pooling data from Europe, we conclude that schooling increases the likelihood to vaccinate against COVID by an economically negligible effect of one percentage point (zero for influenza). However, we find indications that additional schooling increases fear of side effects from COVID vaccination.
AU - Monsees, Daniel
AU - Schmitz, Hendrik
ID - 46536
KW - COVID
KW - influenza
KW - vaccination
KW - education
KW - compulsory schooling
TI - The effect of compulsory schooling on vaccination against COVID and Influenza
VL - 1011
ER -
TY - CONF
AB - One of the main challenges for next generation automotive radars is the improvement of angular resolution to a sub-degree level. In this context, wide aperture automotive radars of 1m length or more and resolution close to 0.1° in azimuth and 0.5° in elevation could be beneficial. To enable coherent processing of arrays with such large aperture, prior (i.e offline) and online calibration are necessary: channel imbalances (gains and phases) and three dimensional coordinates of transmit and receive elements need to be determined. We propose a calibration strategy based on alternating steps between the two subtasks of i) channel imbalance estimation with ‘known’ array positions, by applying a singular value decomposition to the resulting tensor calculus problem; and ii) antenna position estimation with ’known’ channel imbalances, by numerically maximizing the Bayesian posterior probability; in both cases operating on range/Doppler snapshots of disjoint targets (with potentially unknown locations). Simulation studies based on the parameters of a MIMO 8x6 linear sparse array show promising results as long as the initial position errors do not exceed half a wavelength (2mm), beyond which we observe strong effects of ambiguity. Experimental results with real measurements show that after calibration in laboratory conditions, our MIMO 8x6 demonstrator with 50cm aperture is able to resolve two targets at the same range with angular separation at least as close as 0.4°.
AU - Greiff, Christian
AU - Mateos-Núñez, David
AU - Simoni, Renato
AU - González-Huici, Maria
AU - Kruse, Stephan
AU - Scheytt, J. Christoph
AU - Kolk, Karl
AU - Höller, Christian
AU - Kurz, Heiko Gustav
AU - Meinecke, Marc-Michael
AU - Gisder, Thomas
ID - 46426
T2 - 2023 24th International Radar Symposium (IRS)
TI - Calibration of Large Coherent MIMO Radar Arrays: Channel Imbalances and 3D Antenna Positions
ER -
TY - GEN
AU - Ostermann, Moritz
AU - Behm, Jonathan
AU - Marten, Thorsten
AU - Tröster, Thomas
ID - 42459
T2 - WerkstoffPlus Auto 13. Fachtagung für neue Fahrzeug- und Werkstoffkonzepte
TI - NeMo.bil - Dekarbonisierung des Verkehrs mithilfe von Leichtbau-Fahrzeugschwärmen
ER -
TY - JOUR
AU - Kaur, Mannat
AU - Ramulu, Harshini Sri
AU - Acar, Yasemin
AU - Fiebig, Tobias
ID - 45984
IS - CSCW1
JF - Proc. ACM Hum. Comput. Interact.
TI - "Oh yes! over-preparing for meetings is my jam :)": The Gendered Experiences of System Administrators
VL - 7
ER -
TY - JOUR
AU - Bouma-Sims, Elijah
AU - Acar, Yasemin
ID - 45983
IS - CSCW1
JF - Proc. ACM Hum. Comput. Interact.
TI - Beyond the Boolean: How Programmers Ask About, Use, and Discuss Gender
VL - 7
ER -
TY - JOUR
AU - Vöing, Nerea
ID - 46622
JF - Lehren im Leben - Blog der Stiftung Innovation in der Hochschullehre
TI - 16 Fragen, 16 Antworten: In unserer Rubrik „Lehren im Leben” stellen wir Menschen vor, die Hochschullehre gestalten. Folge 6: Dr. Nerea Vöing
VL - 6
ER -
TY - GEN
AB - We discuss in which cases the Dunkl convolution of distributions, possibly
both with non-compact support, can be defined and study its analytic
properties. We prove results on the (singular-)support of Dunkl convolutions.
Based on this, we are able to prove a theorem on elliptic regularity for a
certain class of Dunkl operators, called elliptic Dunkl operators. Finally, for
the root systems of type A we consider the Dunkl-type Riesz distributions,
prove that their Dunkl convolution exists and compute their convolution.
AU - Brennecken, Dominik
ID - 46614
T2 - arXiv:2308.07710
TI - Dunkl convolution and elliptic regularity for Dunkl operators
ER -
TY - JOUR
AU - Vöing, Nerea
ID - 46623
JF - Trafohaus//Lehre (Podcast der HD Sachsen)
TI - Ein Blick auf Lehre und Lernen in Hochschulen durch die Brille der Hochschuldidaktik"
ER -
TY - GEN
AU - Vöing, Nerea
AU - Arnold, Maik
AU - Reisas, Sabine
ID - 46624
TI - Lehrentwicklung durch Scholarship of Teaching and Learning – mit SoTL Hochschullehre beforschen, weiterentwickeln und teilen
ER -
TY - JOUR
AU - Karakaya, Yasin
AU - Somnitz, H.
AU - Hermsen, A.
AU - Gonchikzhapov, Munko
AU - Kasper, Tina
ID - 45602
JF - Applications in Energy and Combustion Science
KW - Metastable particles
KW - Nanomaterials
KW - Quartz-crystal-microbalance
KW - Molecular-beam mass spectrometry
KW - Tetramethylsilane
KW - Reaction kinetics
SN - 2666-352X
TI - Revisiting the initial reaction rates for TMS combustion and a new evidence for metastable silica nanoparticles in the gas-phase synthesis
VL - 14
ER -
TY - CONF
AB - New technologies and materials carry significant potential for sustainable production and use of products. As an example, Additive Manufacturing technologies and materials promise lightweight design and energy efficient use of parts. Exhausting the full potential requires: a) consideration of uncertainties with respect to future capabilities, and b) upgradeable design guidelines to cover advancements consistently. The proposed approach merges concepts of Design-for-X with foresight algorithms of Scenario-Technique to derive actionable knowledge. It is validated by an application in the field of Additive Manufacturing, namely Metal Fused Deposition Modelling. Engineers benefit from the intuitive access to heterogeneous types of sustainability related information.
AU - Gräßler, Iris
AU - Mozgova, Iryna
AU - Pottebaum, Jens
AU - Ott, Manuel
AU - Jung, Philipp
AU - Hesse, Philipp
ED - Teti, Roberto
ID - 46451
KW - Design-for-X
KW - Scenario-Technique
KW - sustainability
KW - uncertainty
KW - Life-Cycle Engineering
KW - Additive Manufacturing
KW - Circular Economy
T2 - Procedia CIRP ICME
TI - Handling of uncertainties in the design of sustainable Additive Manufacturing products by merging Design-for-X and Scenario-Technique
ER -
TY - JOUR
AB - A reliable, but cost-effective generation of single-photon states is key for practical quantum communication systems. For real-world deployment, waveguide sources offer optimum compatibility with fiber networks and can be embedded in hybrid integrated modules. Here, we present what we believe to be the first chip-size fully integrated fiber-coupled heralded single photon source (HSPS) module based on a hybrid integration of a nonlinear lithium niobate waveguide into a polymer board. Photon pairs at 810 nm (signal) and 1550 nm (idler) are generated via parametric down-conversion pumped at 532 nm in the LiNbO3 waveguide. The pairs are split in the polymer board and routed to separate output ports. The module has a size of (2 × 1) cm^2 and is fully fiber-coupled with one pump input fiber and two output fibers. We measure a heralded second-order correlation function of g_h(2)=0.05 with a heralding efficiency of η_h=3.5% at low pump powers
AU - Kießler, Christian
AU - Conradi, Hauke
AU - Kleinert, Moritz
AU - Quiring, Viktor
AU - Herrmann, Harald
AU - Silberhorn, Christine
ID - 46644
IS - 14
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Fiber-coupled plug-and-play heralded single photon source based on Ti:LiNbO3 and polymer technology
VL - 31
ER -
TY - CHAP
AB - SoTL ist eine forschungsbasierte Haltung, die die Hochschullehre verbessern und innovieren will. Das deutschsprachige SoTL-Netzwerk hat fünf Thesen formuliert, die SoTL als Grundhaltung und Motor für Lehrentwicklung betonen. Der Beitrag diskutiert diese Thesen und stellt Aktivitäten des Netzwerks vor, die SoTL an Hochschulen und Universitäten fördern und vernetzen wollen. Dabei wird auch die Rolle der »Teacher-Researcher« hervorgehoben.
AU - Arnold, Maik
AU - Vöing, Nerea
AU - Reisas, Sabine
ID - 46647
SN - 2749-7623
T2 - Hochschulbildung: Lehre und Forschung
TI - Scholarship of Teaching and Learning (SoTL) als Motor für eine inter- und transdisziplinäre Hochschuldidaktik
ER -
TY - CONF
AU - Weller, Julian
AU - Roesmann, Daniel
AU - Eggert, Sönke
AU - von Enzberg, Sebastian
AU - Gräßler, Iris
AU - Dumitrescu, Roman
ID - 46493
SN - 2212-8271
T2 - Procedia CIRP
TI - Identification and prediction of standard times in machining for precision steel tubes through the usage of data analytics
VL - 119
ER -
TY - CONF
AU - Althaus, Maike
AU - Grieger, Nicole
AU - Vorbohle, Christian
AU - Müller, Michelle
AU - Kundisch, Dennis
ID - 46646
TI - Business Models for Cultural Event Platforms - A Taxonomy Approach
ER -
TY - GEN
AU - Mapura Ramirez, Luz Alejandra
AU - Kenig, Eugeny Y.
ID - 46591
TI - Zur Berechnug von flüssigkeitsseitigen Stoffübergagnskoeffizienten für Strukturpackungen
ER -
TY - JOUR
AB - The Koopman operator has become an essential tool for data-driven approximation of dynamical (control) systems in recent years, e.g., via extended dynamic mode decomposition. Despite its popularity, convergence results and, in particular, error bounds are still quite scarce. In this paper, we derive probabilistic bounds for the approximation error and the prediction error depending on the number of training data points; for both ordinary and stochastic differential equations. Moreover, we extend our analysis to nonlinear control-affine systems using either ergodic trajectories or i.i.d.
samples. Here, we exploit the linearity of the Koopman generator to obtain a bilinear system and, thus, circumvent the curse of dimensionality since we do not autonomize the system by augmenting the state by the control inputs. To the
best of our knowledge, this is the first finite-data error analysis in the stochastic and/or control setting. Finally, we demonstrate the effectiveness of the proposed approach by comparing it with state-of-the-art techniques showing its superiority whenever state and control are coupled.
AU - Nüske, Feliks
AU - Peitz, Sebastian
AU - Philipp, Friedrich
AU - Schaller, Manuel
AU - Worthmann, Karl
ID - 23428
JF - Journal of Nonlinear Science
TI - Finite-data error bounds for Koopman-based prediction and control
VL - 33
ER -
TY - GEN
AB - Different conflicting optimization criteria arise naturally in various Deep
Learning scenarios. These can address different main tasks (i.e., in the
setting of Multi-Task Learning), but also main and secondary tasks such as loss
minimization versus sparsity. The usual approach is a simple weighting of the
criteria, which formally only works in the convex setting. In this paper, we
present a Multi-Objective Optimization algorithm using a modified Weighted
Chebyshev scalarization for training Deep Neural Networks (DNNs) with respect
to several tasks. By employing this scalarization technique, the algorithm can
identify all optimal solutions of the original problem while reducing its
complexity to a sequence of single-objective problems. The simplified problems
are then solved using an Augmented Lagrangian method, enabling the use of
popular optimization techniques such as Adam and Stochastic Gradient Descent,
while efficaciously handling constraints. Our work aims to address the
(economical and also ecological) sustainability issue of DNN models, with a
particular focus on Deep Multi-Task models, which are typically designed with a
very large number of weights to perform equally well on multiple tasks. Through
experiments conducted on two Machine Learning datasets, we demonstrate the
possibility of adaptively sparsifying the model during training without
significantly impacting its performance, if we are willing to apply
task-specific adaptations to the network weights. Code is available at
https://github.com/salomonhotegni/MDMTN.
AU - Hotegni, Sedjro Salomon
AU - Peitz, Sebastian
AU - Berkemeier, Manuel Bastian
ID - 46649
T2 - arXiv:2308.12243
TI - Multi-Objective Optimization for Sparse Deep Neural Network Training
ER -
TY - JOUR
AU - Gonchikzhapov, Munko
AU - Kasper, Tina
ID - 46637
JF - Applications in Energy and Combustion Science
KW - Nanoparticle synthesis
KW - Flame spray pyrolysis
KW - SpraySyn burner
KW - Flame structure
KW - Species distribution
KW - Temperature distribution
SN - 2666-352X
TI - Thermal and chemical structure of ethanol and 2-ethylhexanoic acid/ethanol SpraySyn flames
VL - 15
ER -
TY - JOUR
AB - Many problems in science and engineering require an efficient numerical approximation of integrals or solutions to differential equations. For systems with rapidly changing dynamics, an equidistant discretization is often inadvisable as it results in prohibitively large errors or computational effort. To this end, adaptive schemes, such as solvers based on Runge–Kutta pairs, have been developed which adapt the step size based on local error estimations at each step. While the classical schemes apply very generally and are highly efficient on regular systems, they can behave suboptimally when an inefficient step rejection mechanism is triggered by structurally complex systems such as chaotic systems. To overcome these issues, we propose a method to tailor numerical schemes to the problem class at hand. This is achieved by combining simple, classical quadrature rules or ODE solvers with data-driven time-stepping controllers. Compared with learning solution operators to ODEs directly, it generalizes better to unseen initial data as our approach employs classical numerical schemes as base methods. At the same time it can make use of identified structures of a problem class and, therefore, outperforms state-of-the-art adaptive schemes. Several examples demonstrate superior efficiency. Source code is available at https://github.com/lueckem/quadrature-ML.
AU - Dellnitz, Michael
AU - Hüllermeier, Eyke
AU - Lücke, Marvin
AU - Ober-Blöbaum, Sina
AU - Offen, Christian
AU - Peitz, Sebastian
AU - Pfannschmidt, Karlson
ID - 21600
IS - 2
JF - SIAM Journal on Scientific Computing
TI - Efficient time stepping for numerical integration using reinforcement learning
VL - 45
ER -
TY - CHAP
AU - Dahms, Frederik
AU - Homberg, Werner
ID - 46691
SN - 2195-4356
T2 - Lecture Notes in Mechanical Engineering
TI - Analysis and Modelling of the Deformation in the Manufacture of Flange-Contours by the Combined Friction-Spinning and Flow-Forming Process
ER -
TY - CONF
AU - Garnefeld, I.
AU - Böhm, Eva
AU - Hanf, L.
AU - Helm, S.
ID - 46665
T2 - 2023 AMA Summer Academic Conference, San Francisco, CA
TI - Unboxing video effectiveness – Does speech matter?
ER -
TY - CONF
AU - Kessing, K.
AU - Garnefeld, I.
AU - Böhm, Eva
ID - 46666
T2 - EMAC Annual Conference, Odense, Denmark
TI - The dark and bright side of online reviews in manufacturer online shops
ER -
TY - CONF
AU - Hanf, L.
AU - Garnefeld, I.
AU - Böhm, Eva
AU - Helm, S.
ID - 46667
T2 - EMAC Annual Conference, Odense, Denmark
TI - Stimulating engagement with unboxing videos – Does speech matter?
ER -
TY - CONF
AU - Sadeghi-Kohan, Somayeh
AU - Hellebrand, Sybille
AU - Wunderlich, Hans-Joachim
ID - 46739
T2 - 2023 53rd Annual IEEE/IFIP International Conference on Dependable Systems and Networks Workshops (DSN-W)
TI - Low Power Streaming of Sensor Data Using Gray Code-Based Approximate Communication
ER -
TY - CONF
AU - Janzen, Thomas
AU - Wotschel, Philipp
AU - Meier, Jana
AU - Vogelsang, Christoph
ID - 46740
T2 - EARLI 2023
TI - Assessing pre-service EFL teachers’ feedback performance in role-play-based simulations
ER -
TY - JOUR
AU - Zscherp, Mario Fabian
AU - Jentsch, Silas Aurel
AU - Müller, Marius Johannes
AU - Lider, Vitalii
AU - Becker, Celina
AU - Chen, Limei
AU - Littmann, Mario
AU - Meier, Falco
AU - Beyer, Andreas
AU - Hofmann, Detlev Michael
AU - As, Donat Josef
AU - Klar, Peter Jens
AU - Volz, Kerstin
AU - Chatterjee, Sangam
AU - Schörmann, Jörg
ID - 46741
IS - 33
JF - ACS Applied Materials & Interfaces
KW - General Materials Science
SN - 1944-8244
TI - Overcoming the Miscibility Gap of GaN/InN in MBE Growth of Cubic InxGa1–xN
VL - 15
ER -
TY - CONF
AU - Müller, Michelle
AU - Neumann, Jürgen
ID - 33722
T2 - Proceedings of the 55th Hawaii International Conference on System Sciences (HICSS)
TI - Bring me my Meal on your Wheel - An Empirical Analysis of the Impact of Food Delivery Platforms on Local Restaurant Employment
ER -
TY - JOUR
AB - AbstractWorking conditions of knowledge workers have been subject to rapid change recently. Digital nomadism is no longer a phenomenon that relates only to entrepreneurs, freelancers, and gig workers. Corporate employees, too, have begun to uncouple their work from stationary (home) offices and 9-to-5 schedules. However, pursuing a permanent job in a corporate environment is still subject to fundamentally different values than postulated by the original notion of digital nomadism. Therefore, this paper explores the work identity of what is referred to as ‘corporate nomads’. By drawing on identity theory and the results of semi-structured interviews, the paper proposes a conceptualization of the corporate nomad archetype and presents nine salient identity issues of corporate nomads (e.g., holding multiple contradictory identities, the flexibility paradox, or collaboration constraints). By introducing the ‘corporate nomad’ archetype to the Information Systems literature, this article helps to rethink established conceptions of “home office” and socio-spatial configurations of knowledge work.
AU - Marx, Julian
AU - Stieglitz, Stefan
AU - Brünker, Felix
AU - Mirbabaie, Milad
ID - 44143
JF - Business & Information Systems Engineering
KW - Information Systems
SN - 2363-7005
TI - Home (Office) is where your Heart is
ER -
TY - JOUR
AU - Zander, K.K.
AU - Nguyen, D.
AU - Mirbabaie, Milad
AU - Garnett, S.T.
ID - 46487
JF - International Journal of Disaster Risk Reduction
KW - Geology
KW - Safety Research
KW - Geotechnical Engineering and Engineering Geology
KW - Building and Construction
SN - 2212-4209
TI - Aware but not prepared: understanding situational awareness during the century flood in Germany in 2021
VL - 96
ER -
TY - BOOK
AB - In the proposal for our CRC in 2011, we formulated a vision of markets for
IT services that describes an approach to the provision of such services
that was novel at that time and, to a large extent, remains so today:
„Our vision of on-the-fly computing is that of IT services individually and
automatically configured and brought to execution from flexibly combinable
services traded on markets. At the same time, we aim at organizing
markets whose participants maintain a lively market of services through
appropriate entrepreneurial actions.“
Over the last 12 years, we have developed methods and techniques to
address problems critical to the convenient, efficient, and secure use of
on-the-fly computing. Among other things, we have made the description
of services more convenient by allowing natural language input,
increased the quality of configured services through (natural language)
interaction and more efficient configuration processes and analysis
procedures, made the quality of (the products of) providers in the
marketplace transparent through reputation systems, and increased the
resource efficiency of execution through reconfigurable heterogeneous
computing nodes and an integrated treatment of service description and
configuration. We have also developed network infrastructures that have
a high degree of adaptivity, scalability, efficiency, and reliability, and
provide cryptographic guarantees of anonymity and security for market
participants and their products and services.
To demonstrate the pervasiveness of the OTF computing approach, we
have implemented a proof-of-concept for OTF computing that can run
typical scenarios of an OTF market. We illustrated the approach using
a cutting-edge application scenario – automated machine learning (AutoML).
Finally, we have been pushing our work for the perpetuation of
On-The-Fly Computing beyond the SFB and sharing the expertise gained
in the SFB in events with industry partners as well as transfer projects.
This work required a broad spectrum of expertise. Computer scientists
and economists with research interests such as computer networks and
distributed algorithms, security and cryptography, software engineering
and verification, configuration and machine learning, computer engineering
and HPC, microeconomics and game theory, business informatics
and management have successfully collaborated here.
AU - Haake, Claus-Jochen
AU - Meyer auf der Heide, Friedhelm
AU - Platzner, Marco
AU - Wachsmuth, Henning
AU - Wehrheim, Heike
ID - 45863
TI - On-The-Fly Computing -- Individualized IT-services in dynamic markets
VL - 412
ER -
TY - JOUR
AU - Stieglitz, Stefan
AU - Mirbabaie, Milad
AU - Deubel, Annika
AU - Braun, Lea-Marie
AU - Kissmer, Tobias
ID - 45458
JF - International Journal of Information Management
KW - Library and Information Sciences
KW - Computer Networks and Communications
KW - Information Systems
SN - 0268-4012
TI - The potential of digital nudging to bridge the gap between environmental attitude and behavior in the usage of smart home applications
VL - 72
ER -
TY - JOUR
AU - Mirbabaie, Milad
AU - Marx, Julian
AU - Erle, Lukas
ID - 46746
JF - Pacific Asia Journal of the Association for Information Systems
SN - 1943-7544
TI - Digital Nudge Stacking and Backfiring: Understanding Sustainable E-Commerce Purchase Decisions
ER -
TY - DATA
AB - Die Energieaufnahme von Haushaltskältegeräten ist seit den 1990er Jahren erheblich gesunken. Dieser Wert wird von den Herstellern im Neuzustand der Geräte unter Normbedingungen bestimmt. Wie jedes technische System unterliegen jedoch auch Haushaltskältegeräte einem Alterungsprozess, der zu einem Anstieg der Energieaufnahme über die Zeit führt. Im Rahmen dieser Dissertation wurde auf der Grundlage von 100 Messungen der Energieaufnahme, die an 32 Geräten über einen Zeitraum von 21 Jahren durchgeführt wurden, ein Alterungsmodell entwickelt. Dieses Modell ist das erste, das mit Hilfe von Daten der Energieaufnahme real gealterter Geräte entwickelt wurde. Es beschreibt einen Anstieg der Energieaufnahme von 27 % über die durchschnittliche Einsatzzeit eines Haushaltskältegeräts von 16 Jahren. Der stärkste Anstieg erfolgt in den ersten fünf Betriebsjahren. Durch Diffusionsvorgänge in dem im Gehäuse verbauten Polyurethan-Schaum wird das im Zellgas vorhandene Kohlenstoffdioxid durch Luft ersetzt. Hierdurch steigt die Wärmeleitfähigkeit des Schaums um ca. 33 % an, wodurch sich die Energieaufnahme der Geräte erhöht. Des Weiteren wurde der Einsatz von Paraffinen als Phasenwechselmaterial in Haushaltskältegeräten untersucht. Durch deren Einsatz konnte die Energieaufnahme gesenkt und die Funktionalität der Geräte gesteigert werden. Hierfür sind detaillierte Kenntnisse der Materialkenndaten der Paraffine notwendig. Die Wärmeleitfähigkeit der verschiedenen Paraffin-Stoffgruppen in der festen Phase ist jedoch bisher nur unzureichend untersucht worden. Daher wurde ein Messaufbau entwickelt, mit dem die Wärmeleitfähigkeit von festem Paraffin bestimmt werden kann, und es wurden entsprechende Messungen durchgeführt.
AU - Paul, Andreas
ID - 46753
TI - Analyse von Alterungsmechanismen im Hinblick auf die Effizienz von Haushaltskältegeräten
ER -
TY - JOUR
AB - Qualitative comparative analysis (QCA) enables researchers in international management to better understand how the impact of a single explanatory factor depends on the context of other factors. But the analytical toolbox of QCA does not include a parameter for the explanatory power of a single explanatory factor or “condition”. In this paper, we therefore reinterpret the Banzhaf power index, originally developed in cooperative game theory, to establish a goodness-of-fit parameter in QCA. The relative Banzhaf index we suggest measures the explanatory power of one condition averaged across all sufficient combinations of conditions. The paper argues that the index is especially informative in three situations that are all salient in international management and call for a context-sensitive analysis of single conditions, namely substantial limited diversity in the data, the emergence of strong INUS conditions in the analysis, and theorizing with contingency factors. The paper derives the properties of the relative Banzhaf index in QCA, demonstrates how the index can be computed easily from a rudimentary truth table, and explores its insights by revisiting selected papers in international management that apply fuzzy-set QCA. It finally suggests a three-step procedure for utilizing the relative Banzhaf index when the causal structure involves both contingency effects and configurational causation.
AU - Haake, Claus-Jochen
AU - Schneider, Martin
ID - 34114
JF - Journal of International Management
KW - Qualitative comparative analysis
KW - Banzhaf power index
KW - causality
KW - explanatory power
TI - Playing games with QCA: Measuring the explanatory power of single conditions with the Banzhaf index
ER -
TY - CONF
AU - Schwerin, Imke
AU - Häsel-Weide, Uta
ED - Novotna, J.
ED - Moraova, H.
ID - 46757
T2 - International Symposium in Elementary Mathematics Teaching. Proceedings: New Directions in Elementary Mathematics Education
TI - Second grader´s understanding of doubling and halfing in various representations
ER -
TY - CHAP
AU - Schmidt, Rebekka
AU - Tenberge, Claudia
AU - Häsel-Weide, Uta
ED - Vöing, N.
ED - Schmidt, R.
ED - Neiske, I.
ID - 46758
T2 - Aktive Teilhabe fördern – ICM und Student Engagement in der Hochschullehre
TI - Lehre in Zeiten von Digitalisierung und Inklusion - Beispiele aus drei Fächern
ER -
TY - JOUR
AU - A. Erofeeva, Maria
AU - Klowait, Nils
AU - Zababurin, Denis
ID - 46103
IS - 3
JF - Sociology of Power
KW - General Medicine
SN - 2413-144X
TI - How to Speak Silently — Rethinking Materiality, Agency, and Communicative Competence in Virtual Reality
VL - 34
ER -
TY - JOUR
AB - The demands on joining technology are constantly increasing due to the consistent lightweight construction and the associated increasing material mix. To meet these requirements, the adaptability of the joining processes must be improved to be able to process different material combinations and to react to challenges caused by deviations in the process chain. One example of a highly adaptable process due to the two-step process sequence is thermomechanical joining with Friction Spun Joint Connectors (FSJCs) that can be individually adapted to the joint. In this paper, the potentials of the adaption in the two-stage joining process with aluminium auxiliary joining elements are investigated. To this end, it is first investigated whether a thermomechanical forming process can be used to achieve a uniform and controlled manufacturing regarding the process variable of the temperature as well as the geometry of the FSJC. Based on the successful proof of the high and good repeatability in the FSJC manufacturing, possibilities, and potentials for the targeted influencing of the process and FSJC geometry are shown, based on an extensive variation of the process input variables (delivery condition and thus mechanical properties of the raw parts as well as the process parameters of rotational speed and feed rate). Here it can be shown that above all, the feed rate of the final forming process has the strongest influence on the process and thus also offers the strongest possibilities for influencing it.
AU - Borgert, Thomas
AU - Henke, Maximilian
AU - Homberg, Werner
ID - 46483
IS - 4
JF - Journal of Manufacturing and Materials Processing
KW - Industrial and Manufacturing Engineering
KW - Mechanical Engineering
KW - Mechanics of Materials
SN - 2504-4494
TI - Investigations on the Influences of the Thermomechanical Manufacturing of Aluminium Auxiliary Joining Elements
VL - 7
ER -
TY - CHAP
AB - Due to current global challenges regarding energy security as well as climate change the importance of preserving the nature and all available resources is steadily increasing. In order to achieve the energy-saving and climate targets, it is not only necessary to develop new processes and processing possibilities, but also to optimise known process chains with regard to energy and resource efficiency in the area of production technology. Here, the recycling of supposed production waste represents an opportunity to save energy. In addition to the conventional and smelting metallurgical recycling process, extensive research activities have therefore been carried out for alternative solid-state recycling processes. One example is the friction-induced recycling process, which has been used in past studies to demonstrate the energy- and resource-efficient production of semi-finished products from aluminium scrap such as chips. In addition, properties like chemical composition and strength can be adjusted locally and in terms of processing time. This can be used to improve the versatility of further processing steps.
AU - Borgert, Thomas
AU - Homberg, Werner
ID - 46752
SN - 2195-4356
T2 - Lecture Notes in Mechanical Engineering
TI - Friction-Induced Recycled Aluminium Semi-finished Products in Thermo-mechanical Joining Technology
ER -
TY - BOOK
AB - „Lerne deinen Körper besser kennen“, „Das Beste für deine Gesundheit“ und „Ihre Transformation beginnt jetzt“ - mit Versprechen wie diesen vermitteln die Produkttexte von Wearables wie Fitnesstracker und Smartwatches ein ganz bestimmtes Bild ihrer vorgesehenen Nutzer*innen und deren Nutzung. Verbunden mit den kleinen, am Handgelenk getragenen Geräten sind Fragen nach Erkenntnisgewinn und Kontrollverlust, Selbstoptimierung und Quantifizierungslogiken, Eigenverantwortung und Fremdsteuerung. Die vorliegende Arbeit widmet sich diesem komplexen Spannungsfeld und verfolgt dabei einen multiperspektivischen Ansatz: im Rahmen einer Dispositivanalyse werden die einzelnen Elemente des Wearable-Dispositivs als eigenständige, empirisch zu untersuchende Analysegegenstände betrachtet, um so das Zusammenwirken und die komplexe Beziehung von Diskursen, Gegenständen, Nutzung, Subjekten und Gesellschaft zu erforschen. Ein besonderes Erkenntnisinteresse liegt dabei auf dem Wissen, was sich über Wearables etabliert hat und sich in den Alltagspraktiken der Nutzer*innen widerspiegelt sowie bei der Frage nach den möglichen Funktionen und Auswirkungen des Wearable-Dispositivs.
AU - Schloots, Franziska Margarete
ID - 44719
KW - Selbstvermessung
KW - Dispositivanalyse
KW - Gesundheitsdiskurs
KW - Quantifizierungsgesellschaft
KW - Wearables
KW - Selbstoptimierung
SN - 2512-112X
TI - Mit dem Leben Schritt halten - Eine Analyse des Wearable-Dispositivs
ER -
TY - CONF
AU - Tchomgue Simeu, Arnold
AU - Mahnken, Rolf
ID - 46762
T2 - XI International Conference on Adaptive Modeling and Simulation
TI - Mesh- and model adaptivity for elasto-plastic mean-field and full-field homogenization based on downwind and upwind approximations
ER -
TY - JOUR
AB -
Purpose
This study aims to conceptually propose and empirically validate a path perspective on the servitization process of manufacturing firms. It identifies a customer and an outcome path to servitization, sheds light on the pivotal role of digital technology usage for both value-creating paths and explores their financial and relational performance outcomes.
Design/methodology/approach
The authors use a mixed-method approach, combining a qualitative study with a cross-sectional survey in the USA, the UK and Germany.
Findings
Manufacturing firms choose between two generic paths to servitization, a customer and an outcome path. Digital technology usage is equally important for both value-creating paths. Progress on the outcome path has a positive effect on firms’ financial performance, whereas the customer path has an indirect effect only, fully mediated by firms’ relational performance. Customer tenure and customer’s open-mindedness are contingency variables in the digital technology usage – servitization path – firm performance framework.
Research limitations/implications
A path perspective is useful to conceptualize the servitization processes in manufacturing industries. Future research should investigate the sequential choice of servitization paths and explore its drivers and performance outcomes.
Practical implications
To create and claim superior value for their customers, managers can choose between two servitization paths, leading to differential performance outcomes. While digital technology usage is key to progress on both paths, it is particularly effective for newly acquired customers on the customer path. Suppliers should target their value-creating service offerings at open-minded customer firms to reap their full performance potential.
Originality/value
Propose and empirically validate a path-perspective on servitization. Understand the pivotal importance of digital technology usage for both servitization paths.
AU - Harrmann, Lisa Katharina
AU - Eggert, Andreas
AU - Böhm, Eva
ID - 46642
IS - 3
JF - European Journal of Marketing
KW - Marketing
SN - 0309-0566
TI - Digital technology usage as a driver of servitization paths in manufacturing industries
VL - 57
ER -
TY - JOUR
AB - Über zwei Drittel der Anfänger*innen im Übergangssystem verfügen maximal über einen Hauptschul-/Mittelschulabschluss. Sie sind damit überrepräsentiert, was sich weniger durch ihre Kompetenzen als mit ihrem sozioökonomischen Status und klassenspezifischen Nachqualifizierungsverhalten erklären lässt.
AU - Sommer, Christian
ID - 46765
JF - Berufsbildung. Zeitschrift für Theorie-Praxis-Dialog
KW - Social inequality
KW - Transition system
SN - 00059536
TI - Der Hauptschulabschluss als sozial selektiver Hauptzulieferer des Übergangssystems
VL - 199
ER -
TY - CHAP
AU - Süßmann, Johannes
ED - Diekmann, Julia
ED - Moors, Markus
ED - Neuwöhner, Andreas
ID - 46234
SN - 978-3-506-79364-5
T2 - Monumenta. Erinnerungsorte zwischen Weser und Lippe. Die Monumenta Paderbornensia des Ferdinand von Fürstenberg
TI - »In der Art von Inschriften«. Emblematische Inschriftendichtung als Darstellungsprinzip von Ferdinand von Fürstenbergs Monumenta Paderbornensia (1669 und 1672)
VL - 92
ER -
TY - JOUR
AU - Zdoupas, Philippos
AU - Laubenstein, Désirée
ID - 45323
IS - 5
JF - European Journal of Special Needs Education (Latest Articles)
TI - Perceptions of inclusion in students with diagnosed behavioural, emotional and social difficulties (BESD) displaying internalising and externalising behaviour in inclusive and special education
VL - 38
ER -
TY - BOOK
AU - Zdoupas, Philippos
AU - Lara, Kuhlhoff
AU - Martin, Grust
AU - Jaekel, Anne-Marie
AU - Jan, Ehlert
ID - 46276
TI - Entwicklungszielgespräche in der Sekundarstufe I - Systemisches Coaching mit Schüler:innen nach dem GROW-Modell
ER -
TY - JOUR
AU - Schubatzky, Thomas
AU - Burde, Jan-Philipp
AU - Große-Heilmann, Rike
AU - Haagen-Schützenhöfer, Claudia
AU - Riese, Josef
AU - Weiler, David
ID - 46760
JF - Computers & Education
KW - Education
KW - General Computer Science
SN - 0360-1315
TI - Predicting the development of digital media PCK/TPACK: The role of PCK, motivation to use digital media, interest in and previous experience with digital media
ER -
TY - JOUR
AU - Wallscheid, Oliver
AU - Peitz, Sebastian
AU - Stenner, Jan
AU - Weber, Daniel
AU - Boshoff, Septimus
AU - Meyer, Marvin
AU - Chidananda, Vikas
AU - Schweins, Oliver
ID - 46784
IS - 89
JF - Journal of Open Source Software
KW - General Earth and Planetary Sciences
KW - General Environmental Science
SN - 2475-9066
TI - ElectricGrid.jl - A Julia-based modeling and simulationtool for power electronics-driven electric energy grids
VL - 8
ER -
TY - CHAP
AB - SoTL ist eine forschungsbasierte Haltung, die die Hochschullehre verbessern und innovieren will. Das deutschsprachige SoTL-Netzwerk hat fünf Thesen formuliert, die SoTL als Grundhaltung und Motor für Lehrentwicklung betonen. Der Beitrag diskutiert diese Thesen und stellt Aktivitäten des Netzwerks vor, die SoTL an Hochschulen und Universitäten fördern und vernetzen wollen. Dabei wird auch die Rolle der »Teacher-Researcher« hervorgehoben.
AU - Arnold, Maik
AU - Vöing, Nerea
AU - Reisas, Sabine
ID - 46787
SN - 2749-7623
T2 - Hochschulbildung: Lehre und Forschung
TI - Scholarship of Teaching and Learning (SoTL) als Motor für eine inter- und transdisziplinäre Hochschuldidaktik
ER -
TY - JOUR
AB - For improved and rational design of catalysts, in-depth knowledge of their formation and structural evolution during synthesis is a key parameter. Thus, preparation of a Ni methanation catalyst derived from...
AU - Prinz, Nils
AU - Strübbe, Sven
AU - Bauer, Matthias
AU - Zobel, Mirijam
ID - 45480
JF - New Journal of Chemistry
KW - Materials Chemistry
KW - General Chemistry
KW - Catalysis
SN - 1144-0546
TI - Structural transitions during Ni nanoparticle formation by decomposition of a Ni-containing metal-organic framework using in-situ total scattering
ER -
TY - CHAP
AU - Böker, Ines
AU - Willeke, Stephanie
ED - Hofmann, Michael
ED - Thielking, Sigrid
ID - 46795
T2 - Neue Perspektiven einer kulturwissenschaftlich orientierten Literaturdidaktik
TI - "Nicht das erste Mal, dass ich die Orientierung verloren habe" – Transkulturalität und Deutschdidaktik im Dialog
ER -
TY - CHAP
AU - Böker, Ines
ED - Böker, Ines
ED - Schulte Eickholt, Swen
ID - 46797
T2 - Interkulturelle Konstellationen in Literaturwissenschaft und Literaturdidaktik
TI - Kurze Bestandsaufnahme zum postmigrantischen Theater und postmigrantischer Theaterwissenschaft
ER -
TY - BOOK
ED - Böker, Ines
ED - Schulte Eickholt, Swen
ID - 46798
TI - Interkulturelle Konstellationen in Literaturwissenschaft und Literaturdidaktik
ER -
TY - GEN
AB - In common law systems, firms’ litigation risk depends both on written laws and how courts interpret these laws. Using 321 U.S. circuit court rulings, we introduce a novel measure capturing courts’ attitudes towards defendants in securities lawsuits. Our results confirm that financial misreporting firms in more defendant-friendly circuits face fewer lawsuits. Consistent with lower expected litigation costs, firms in these circuits face less negative market reactions when misreporting is revealed, invest less in preventing misreporting, and are more likely to engage in aggressive misreporting. We conclude that defendant-friendly precedents reduce firms’ legal liability and worsen their financial reporting quality.
AU - Franke, Benedikt
AU - Huang, Allen
AU - Li, Reeyarn
AU - Wang, Hui
ID - 46804
TI - Securities Law Precedents, Legal Liability, and Financial Reporting Quality
ER -
TY - CHAP
AU - Rossel, M.
AU - Meschut, G.
ID - 46809
SN - 2195-4356
T2 - Lecture Notes in Mechanical Engineering
TI - Modeling and Parameterization for a 3D Simulation of Clinching with an Extensible Die
ER -
TY - JOUR
AB - AbstractObjectiveConcerns about short‐ and long‐term consequences of repetitive heading contributed to heading restrictions in youth football in some countries. This prospective longitudinal cohort study aims to describe heading exposure in children's and youth football over two seasons using standardized video analysis.MethodsAll matches and training sessions of a male Under‐11 (n = 29), Under‐15 (n = 28), Under‐19 (n = 38), and female Under‐17 (n = 39) team were videotaped during the seasons 2019–2020 and 2020–2021. Heading frequencies and characteristics were analyzed. Individual heading exposure is presented as average incidence rates (IR) per 1000 match/training hours.ResultsIn 275 matches and 673 training sessions, 22 921 headers were observed. Heading IR per player in matches was 1256 (Under‐11 m), 1608 (Under‐15 m), 1050 (Under‐17 f), and 1966 (Under‐19 m). In training sessions, IR per player was 739 (Under‐11 m), 2206 (Under‐15 m), 1661 (Under‐17 f), and 1419 (Under‐19 m). Five Under‐15 males headed the ball five to eight times per training on average. Most headers were performed without heading duels. Flight distance was predominantly 5–20 m (54%) in matches and <5 m (65%) in training. While head impact location most frequently was at frontal areas, one‐third of all headers in Under‐11 in matches hit temporal, parietal, and occipital parts of the head.ConclusionHeading incidence was low in the youngest age group, whereas (predominantly five) Under‐15 males showed very high heading exposures in training. In assessment and regulation of heading burden, training sessions and individual heading behavior should specifically be addressed. Recommendations for heading the ball in practice should account for individual and age‐related differences.
AU - Reeschke, Rebecca
AU - Haase, Franziska Katharina
AU - Dautzenberg, Lena
AU - Krutsch, Werner
AU - Reinsberger, Claus
ID - 46818
IS - 9
JF - Scandinavian Journal of Medicine & Science in Sports
KW - Physical Therapy
KW - Sports Therapy and Rehabilitation
KW - Orthopedics and Sports Medicine
SN - 0905-7188
TI - Training matters: Heading incidence and characteristics in children's and youth football (soccer) players
VL - 33
ER -
TY - BOOK
AU - Rossel, Moritz Sebastian
AU - Meschut, Gerson
ID - 46812
TI - Methodenentwicklung zur verbesserten Prognosegüte beim Clinchen mit beweglicher Matrize in der numerischen Fügeprozesssimulation
VL - 598
ER -
TY - JOUR
AU - Höper, Lukas
AU - Schulte, Carsten
ID - 46186
IS - 4
JF - MNU journal
SN - 0025-5866
TI - Paradigmenwechsel vom klassischen zum datengetriebenen Problemlösen im Informatikunterricht
VL - 76
ER -
TY - JOUR
AU - Pfister, Daniel
AU - Jackson, Robin C
AU - Güldenpenning, Iris
AU - Williams, A Mark
ID - 46736
JF - Human Movement Science
TI - Timing a fake punch: Inhibitory effects in a boxing-specific spatial attention task
VL - 89
ER -
TY - CONF
AU - Blömer, Johannes
AU - Bobolz, Jan
AU - Bröcher, Henrik
ID - 35014
TI - On the impossibility of surviving (iterated) deletion of weakly dominated strategies in rational MPC
ER -
TY - CONF
AU - Blömer, Johannes
AU - Bobolz, Jan
AU - Porzenheim, Laurens Alexander
ID - 43458
TI - A Generic Construction of an Anonymous Reputation System and Instantiations from Lattices
ER -
TY - CHAP
AU - Schroeter-Wittke, Harald
AU - Junkermann, Ilse
ID - 46856
T2 - Ich lobe meinen Gott, der aus der Tiefe mich holt. Hymnologische Kommentare zu den Liedern im Ergänzungsheft zum Evangelischen Gesangbuch. Jan Janssen zum 60. Geburtstag. HEG 3/Ergänzungsheft, Göttingen 2023
TI - Stern über Bethlehem (EG.E 1)
ER -
TY - CHAP
AU - Schroeter-Wittke, Harald
ID - 46857
T2 - Ich lobe meinen Gott, der aus der Tiefe mich holt. Hymnologische Kommentare zu den Liedern im Ergänzungsheft zum Evangelischen Gesangbuch. Jan Janssen zum 60. Geburtstag. HEG 3/Ergänzungsheft, Göttingen 2023
TI - Wir haben Gottes Spuren festgestellt (EG.E 20)
ER -
TY - JOUR
AB - In this work, the influence of the filler–matrix adhesion on the tensile properties of laser-sintered parts built with Polyamide 613 filled with glass beads was investigated. For this purpose, dry blends of glass beads with and without organosilane coupling agents and polyamide powder were prepared and processed into tensile specimens on an EOS P396 laser sintering system. The samples were tested both in the dry state and after an accelerated conditioning in a climate chamber. Furthermore, finite element method (FEM) simulations were performed to model the extreme cases of optimum adhesion and no adhesion. By correlating the tensile tests with the simulation results and by analyzing the fracture surfaces, it was shown that the filler–matrix adhesion is sufficient in the dry state but is strongly degraded by conditioning. Even the presence of various organosilane thin films could not prevent a strong deterioration of the filler–matrix adhesion and the associated deterioration of the mechanical properties. Since a comparison with an injection-molded sample of the same polymer filler combination shows identical behavior after conditioning, it is assumed that this problem is not limited to additively manufactured parts.
AU - Kletetzka, Ivo
AU - Kosanke, Maren
AU - Meinderink, Dennis
AU - Neßlinger, Vanessa
AU - Grundmeier, Guido
AU - Schmid, Hans-Joachim
ID - 46815
JF - Progress in Additive Manufacturing
KW - Industrial and Manufacturing Engineering
SN - 2363-9512
TI - Influence of the filler–matrix adhesion and the effects of conditioning on tensile properties of laser-sintered parts built with polyamide–glass bead dry blends
ER -
TY - GEN
AB - Abstract
In this work, the influence of the filler matrix adhesion on the tensile properties of laser-sintered parts built with Polyamide 613 filled with glass beads was investigated. For this purpose, dry blends of glass beads with and without organosilane coupling agents and polyamide powder were prepared and processed into tensile specimens on an EOS P396. The samples were tested both in the dry state and after an accelerated conditioning in a climate chamber. Furthermore, FEM simulations were performed to model the limiting cases of optimum adhesion and no adhesion. By correlating the tensile tests with the simulation results and by analyzing the fracture surfaces, it was shown that the filler matrix adhesion is sufficient in the dry state but is strongly degraded by conditioning. Even the presence of various organosilane thin films could not prevent a strong deterioration of the filler-matrix adhesion and the associated deterioration of the mechanical properties. Since a comparison with an injection molded sample of the same polymer filler combination shows identical behavior after conditioning, it is assumed that this problem is not limited to additively manufactured parts.
AU - Kletetzka, Ivo
AU - Kosanke, Maren
AU - Meinderink, Dennis
AU - Neßlinger, Vanessa
AU - Grundmeier, Guido
AU - Schmid, Hans-Joachim
ID - 43049
TI - Influence of the filler matrix adhesion and the effects of conditioning on tensile properties of laser sintered parts built with polyamide glass bead dry blends
ER -
TY - GEN
AU - Kletetzka, Ivo
ID - 45783
TI - Tensile Testing for Polymer AM - Best Pratice at the DMRC
ER -
TY - JOUR
AB - In the laser sintering technology, the semi-crystalline polymer material is exposed to elevated temperatures during processing, which leads to serious material ageing for most materials. This has already been investigated intensively by various authors. However, the ageing of the material at ambient temperatures during shelf life has not been the focus so far. The need to analyse the shelf life can be derived from an ecological and economic point of view. This work is focusing on the shelf life of PA2200 (PA12). To reduce the potential influences of powder production fluctuations, two different powder batches stored for 5.5 years and 6.5 years are investigated and compared to a reference powder produced 0.5 years before these investigations. Multiple powder analyses and part characterisations have been performed. A significant yellowing and molecular chain length reduction can be derived from the measurement results. Whereas the influence on mechanical part performance was minor, the parts built with the stored powders are more yellowish. As it is most likely that this is due to the consumption of polyamide stabilisers, it can be assumed that these parts will be subject to significantly faster ageing. Therefore, it is still not recommended to use the stored powders for critical parts or light intense and humid environments.
AU - Klippstein, Sven Helge
AU - Kletetzka, Ivo
AU - Sural, Ilknur
AU - Schmid, Hans-Joachim
ID - 43046
JF - The International Journal of Advanced Manufacturing Technology
KW - Selective laser sintering
KW - Shelf life
KW - Polyamide 12
KW - powder
KW - PA2200
KW - material ageing
TI - Influence of a prolonged shelf time on PA12 laser sintering powder and resulting part properties
ER -
TY - GEN
AU - Sajadi, Said
ID - 46861
TI - Charakterisierung und Bewertung von flammgeschützten PA12 Pulvermischungen hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess
ER -
TY - CONF
AU - Troschitz, Juliane
AU - Vorderbrüggen, Julian Heinrich Josef
AU - Gude, Maik
AU - Meschut, Gerson
ID - 46866
T2 - Proceedings of the 23rd International Conference on Composite Materials (ICCM23)
TI - Clinching and resistance spot welding of thermoplastic composites with metals using inserts as joining interfaces
ER -
TY - CHAP
AU - Dieter, Peter
ID - 46867
SN - 0302-9743
T2 - Lecture Notes in Computer Science
TI - A Regret Policy for the Dynamic Vehicle Routing Problem with Time Windows
ER -
TY - CHAP
AU - Menge, Dennis
AU - Milaege, Dennis
AU - Hoyer, Kay-Peter
AU - Schmid, Hans-Joachim
AU - Schaper, Mirko
ED - Horwath, Illona
ED - Schweizer, Swetlana
ID - 46870
SN - 2703-1543
T2 - Climate Protection, Resource Efficiency, and Sustainable Engineering
TI - Case Study IV: Individualized Medical Technology using Additive Manufacturing
ER -
TY - CONF
AU - Hansmeier, Philipp
ID - 46892
T2 - Proceedings of the 18th International Conference on Wirtschaftsinformatik
TI - Exploring Platform Types and Related Concepts in Service Research – A Systematic Scoping Literature Review
ER -
TY - BOOK
ED - Alpermann, Ilsabe
ED - Besser, Beate
ED - Evang, Martin
ED - Schroeter-Wittke, Harald
ID - 46854
TI - Ich lobe meinen Gott, der aus der Tiefe mich holt. Hymnologische Kommentare zu den Liedern im Ergänzungsheft zum Evangelischen Gesangbuch. Jan Janssen zum 60. Geburtstag. HEG 3/Ergänzungsheft, Göttingen 2023
ER -
TY - CHAP
AU - Schroeter-Wittke, Harald
AU - Kirsner, Inge
ID - 46896
T2 - Predigtstudien VI/1
TI - XXmas: Macht gebären statt Macht gebaren. 1. Weihnachtstag (Christfest I) 2Mose 2,1-10
ER -