TY - CHAP
AU - Hoppe, Julia Amelie
AU - Johansson-Pajala, Rose-Marie
AU - Gustafsson, Christine
AU - Melkas, Helinä
AU - Tusku, Outi
AU - Pekkarinen, Satu
AU - Hennala, Lea
AU - Thommes, Kirsten
ED - Haltaufderheide, Joschka
ED - Hovemann, Johanna
ED - Vollmann, Jochen
ID - 17367
T2 - Aging between Participation and Simulation - Ethical Dimensions of Socially Assistive Technologies in elderly care
TI - Assistive robots in care: Expectations and perceptions of older people
ER -
TY - JOUR
AU - Chantakit, Teanchai
AU - Schlickriede, Christian
AU - Sain, Basudeb
AU - Meyer, Fabian
AU - Weiss, Thomas
AU - Chattham, Nattaporn
AU - Zentgraf, Thomas
ID - 17390
IS - 9
JF - Photonics Research
SN - 2327-9125
TI - All-dielectric silicon metalens for two-dimensional particle manipulation in optical tweezers
VL - 8
ER -
TY - JOUR
AB - The development of renewable energies and smart mobility has profoundly impacted the future of the distribution grid. An increasing bidirectional energy flow stresses the assets of the distribution grid, especially medium voltage switchgear. This calls for improved maintenance strategies to prevent critical failures. Predictive maintenance, a maintenance strategy relying on current condition data of assets, serves as a guideline. Novel sensors covering thermal, mechanical, and partial discharge aspects of switchgear, enable continuous condition monitoring of some of the most critical assets of the distribution grid. Combined with machine learning algorithms, the demands put on the distribution grid by the energy and mobility revolutions can be handled. In this paper, we review the current state-of-the-art of all aspects of condition monitoring for medium voltage switchgear. Furthermore, we present an approach to develop a predictive maintenance system based on novel sensors and machine learning. We show how the existing medium voltage grid infrastructure can adapt these new needs on an economic scale.
AU - Hoffmann, Martin W.
AU - Wildermuth, Stephan
AU - Gitzel, Ralf
AU - Boyaci, Aydin
AU - Gebhardt, Jörg
AU - Kaul, Holger
AU - Amihai, Ido
AU - Forg, Bodo
AU - Suriyah, Michael
AU - Leibfried, Thomas
AU - Stich, Volker
AU - Hicking, Jan
AU - Bremer, Martin
AU - Kaminski, Lars
AU - Beverungen, Daniel
AU - zur Heiden, Philipp
AU - Tornede, Tanja
ID - 17426
JF - Sensors
SN - 1424-8220
TI - Integration of Novel Sensors and Machine Learning for Predictive Maintenance in Medium Voltage Switchgear to Enable the Energy and Mobility Revolutions
ER -
TY - GEN
AB - Syntactic annotation of corpora in the form of part-of-speech (POS) tags is a key requirement for both linguistic research and subsequent automated natural language processing (NLP) tasks. This problem is commonly tackled using machine learning methods, i.e., by training a POS tagger on a sufficiently large corpus of labeled data.
While the problem of POS tagging can essentially be considered as solved for modern languages, historical corpora turn out to be much more difficult, especially due to the lack of native speakers and sparsity of training data. Moreover, most texts have no sentences as we know them today, nor a common orthography.
These irregularities render the task of automated POS tagging more difficult and error-prone. Under these circumstances, instead of forcing the POS tagger to predict and commit to a single tag, it should be enabled to express its uncertainty. In this paper, we consider POS tagging within the framework of set-valued prediction, which allows the POS tagger to express its uncertainty via predicting a set of candidate POS tags instead of guessing a single one. The goal is to guarantee a high confidence that the correct POS tag is included while keeping the number of candidates small.
In our experimental study, we find that extending state-of-the-art POS taggers to set-valued prediction yields more precise and robust taggings, especially for unknown words, i.e., words not occurring in the training data.
AU - Heid, Stefan Helmut
AU - Wever, Marcel Dominik
AU - Hüllermeier, Eyke
ID - 17605
T2 - Journal of Data Mining and Digital Humanities
TI - Reliable Part-of-Speech Tagging of Historical Corpora through Set-Valued Prediction
ER -
TY - CONF
AU - Haeb-Umbach, Reinhold
ED - Böck, Ronald
ED - Siegert, Ingo
ED - Wendemuth, Andreas
ID - 17763
KW - Poster
SN - 978-3-959081-93-1
T2 - Studientexte zur Sprachkommunikation: Elektronische Sprachsignalverarbeitung 2020
TI - Sprachtechnologien für Digitale Assistenten
ER -
TY - JOUR
AB - We numerically simulate multiple light scattering in discrete disordered media represented by large clusters of irregular non-absorbing particles. The packing density of clusters is 0.5. With such conditions diffuse scattering is significantly reduced and light transport follows propagation channels that are determined by the particle size and topology of the medium. This kind of localization produces coherent backscattering intensity surge and enhanced negative polarization branch if compared to lower density samples.
AU - Grynko, Yevgen
AU - Shkuratov, Yuriy
AU - Förstner, Jens
ID - 17803
JF - Journal of Quantitative Spectroscopy and Radiative Transfer
KW - tet_topic_scattering
SN - 0022-4073
TI - Light backscattering from large clusters of densely packed irregular particles
VL - 255
ER -
TY - CONF
AU - Reinhold, Jannik
AU - Frank, Maximilian
AU - Koldewey, Christian
AU - Dumitrescu, Roman
AU - Buss, Eugen
ID - 18876
T2 - Proceedings of the ISPIM Connects Bangkok – Partnering for an Innovative Community
TI - In-depth Analysis of the Effects of Smart Services on Value Creation
ER -
TY - JOUR
AU - Eke, Norbert Otto
ID - 19153
IS - 1
JF - German Life and Letters (Special Issue: Herta Müller and the Currents of European History)
TI - Der ‚Eigene Kalender‘ des Erinnerns: Die Wahrheit der erfundenen Erinnerung in Herta Müllers Romanen, Erzählungen und Essays
VL - 73
ER -
TY - CHAP
AU - Reinhold, Jannik
AU - Koldewey, Christian
AU - Dumitrescu, Roman
ED - Buchholz, Birgit
ED - Bürger, Matthias
ID - 20568
T2 - Der Geschäftsmodell-Toolguide
TI - GEMINI-Modellierungssprache für Wertschöpfungssysteme
ER -
TY - CHAP
AU - Koldewey, Christian
AU - Reinhold, Jannik
AU - Dumitrescu, Roman
ED - Buchholz, Birgit
ED - Bürger, Matthias
ID - 20570
T2 - Der Geschäftsmodell-Toolguide
TI - GEMINI-Geschäftsmodellmuster-Kartenset
ER -
TY - CHAP
AU - Koldewey, Christian
AU - Reinhold, Jannik
AU - Dumitrescu, Roman
ED - Buchholz, Birgit
ED - Bürger, Matthias
ID - 20571
T2 - Der Geschäftsmodell-Toolguide
TI - Geschäftsmodellvalidierung
ER -
TY - CHAP
AU - Koldewey, Christian
AU - Reinhold, Jannik
AU - Dumitrescu, Roman
ED - Buchholz, Birgit
ED - Bürger, Matthias
ID - 20573
T2 - Der Geschäftsmodell-Toolguide
TI - Geschäftsmodell-Roadmapping
ER -
TY - CONF
AU - Boeddeker, Christoph
AU - Nakatani, Tomohiro
AU - Kinoshita, Keisuke
AU - Haeb-Umbach, Reinhold
ID - 20695
SN - 9781509066315
T2 - ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
TI - Jointly Optimal Dereverberation and Beamforming
ER -
TY - CONF
AU - Boeddeker, Christoph
AU - Cord-Landwehr, Tobias
AU - Heitkaemper, Jens
AU - Zorila, Catalin
AU - Hayakawa, Daichi
AU - Li, Mohan
AU - Liu, Min
AU - Doddipatla, Rama
AU - Haeb-Umbach, Reinhold
ID - 20700
T2 - Proc. CHiME 2020 Workshop on Speech Processing in Everyday Environments
TI - Towards a speaker diarization system for the CHiME 2020 dinner party transcription
ER -
TY - BOOK
ED - Herzig, Bardo
ED - Klar, Tilman-Mathies
ED - Martin, Alexander
ED - Meister, Dorothee
ID - 20705
SN - 1424-3636
TI - Orientierungen in der digitalen Welt
ER -
TY - CONF
AU - Camberg, Alan Adam
AU - Tröster, Thomas
ID - 20854
TI - A simplified method for the evaluation of the layer compression test using one 3D digital image correlation system and considering the material anisotropy by the equibiaxial Lankford parameter
ER -
TY - CONF
AU - Camberg, Alan Adam
AU - Erhart, Tobias
AU - Tröster, Thomas
ID - 20856
TI - Predicting fracture at non-isothermal forming conditions: A temperature dependent extension of the LS-DYNA GISSMO fracture indicator framework
ER -
TY - CONF
AB - Augmented Reality (AR) has recently found high attention in mobile shopping apps such as in domains like furniture or decoration. Here, the developers of the apps focus on the positioning of atomic 3D objects in the physical environment. With this focus, they neglect the configuration of multi-faceted 3D object composition according to the user needs and environmental constraints. To tackle these challenges, we present a model-based approach to support AR-assisted product con-figuration based on the concept of Dynamic Software Product Lines. Our approach splits products (e.g. table) into parts (e.g. tabletop, ta-ble legs, funnier) with their 3D objects and additional information (e.g. name, price). The possible products, which can be configured out of these parts, are stored in a feature model. At runtime, this feature model can be used to configure 3D object compositions out of the product parts and adapt to user needs and environmental constraints. The benefits of this approach are demonstrated by a case study of configuring modular kitchens with the help of a prototypical mobile-based implementation.
AU - Gottschalk, Sebastian
AU - Yigitbas, Enes
AU - Schmidt, Eugen
AU - Engels, Gregor
ED - Bernhaupt, Regina
ED - Ardito, Carmelo
ED - Sauer, Stefan
ID - 18249
KW - Product Configuration
KW - Augmented Reality
KW - Runtime Adaptation
KW - Dynamic Software Product Lines
T2 - Human-Centered Software Engineering. HCSE 2020
TI - Model-based Product Configuration in Augmented Reality Applications
VL - 12481
ER -
TY - GEN
AU - Schürmann, Patrick
ID - 18637
TI - A Group Signature Scheme from Flexible Public Key Signatures and Structure-Preserving Signatures on Equivalence Classes
ER -
TY - JOUR
AB - Many dimensionality and model reduction techniques rely on estimating dominant eigenfunctions of associated dynamical operators from data. Important examples include the Koopman operator and its generator, but also the Schrödinger operator. We propose a kernel-based method for the approximation of differential operators in reproducing kernel Hilbert spaces and show how eigenfunctions can be estimated by solving auxiliary matrix eigenvalue problems. The resulting algorithms are applied to molecular dynamics and quantum chemistry examples. Furthermore, we exploit that, under certain conditions, the Schrödinger operator can be transformed into a Kolmogorov backward operator corresponding to a drift-diffusion process and vice versa. This allows us to apply methods developed for the analysis of high-dimensional stochastic differential equations to quantum mechanical systems.
AU - Klus, Stefan
AU - Nüske, Feliks
AU - Hamzi, Boumediene
ID - 21819
JF - Entropy
SN - 1099-4300
TI - Kernel-Based Approximation of the Koopman Generator and Schrödinger Operator
ER -
TY - CONF
AU - Bobolz, Jan
AU - Eidens, Fabian
AU - Krenn, Stephan
AU - Slamanig, Daniel
AU - Striecks, Christoph
ID - 16487
T2 - Proceedings of the 15th ACM Asia Conference on Computer and Communications Security (ASIA CCS ’20),
TI - Privacy-Preserving Incentive Systems with Highly Efficient Point-Collection
ER -
TY - JOUR
AU - Sain, Basudeb
AU - Zentgraf, Thomas
ID - 16839
JF - Light: Science & Applications
SN - 2047-7538
TI - Metasurfaces help lasers to mode-lock
VL - 9
ER -
TY - JOUR
AU - Zhou, Hongqiang
AU - Sain, Basudeb
AU - Wang, Yongtian
AU - Schlickriede, Christian
AU - Zhao, Ruizhe
AU - Zhang, Xue
AU - Wei, Qunshuo
AU - Li, Xiaowei
AU - Huang, Lingling
AU - Zentgraf, Thomas
ID - 16931
IS - 5
JF - ACS Nano
SN - 1936-0851
TI - Polarization-Encrypted Orbital Angular Momentum Multiplexed Metasurface Holography
VL - 14
ER -
TY - CONF
AB - The continuous innovation of its business models is an important task for a company to stay competitive. During this process, the company has to validate various hypotheses about its business models by adapting to uncertain and changing customer needs effectively and efficiently. This adaptation, in turn, can be supported by the concept of Software Product Lines (SPLs). SPLs reduce the time to market by deriving products for customers with changing requirements using a common set of features, structured as a feature model. Analogously, we support the process of business model adaptation by applying the engineering process of SPLs to the structure of the Business Model Canvas (BMC). We call this concept a Business Model Decision Line (BMDL). The BMDL matches business domain knowledge in the form of a feature model with customer needs to derive hypotheses about the business model together with experiments for validation. Our approach is effective by providing a comprehensive overview of possible business model adaptations and efficient by reusing experiments for different hypotheses. We implement our approach in a tool and illustrate the usefulness with an example of developing business models for a mobile application.
AU - Gottschalk, Sebastian
AU - Rittmeier, Florian
AU - Engels, Gregor
ID - 16933
KW - Business Model Decision Line
KW - Business Model Adaptation
KW - Hypothesis-driven Adaptation
KW - Software Product Line
KW - Feature Model
T2 - Proceedings of the 22nd IEEE International Conference on Business Informatics
TI - Hypothesis-driven Adaptation of Business Models based on Product Line Engineering
ER -
TY - CONF
AB - To build successful products, the developers have to adapt their product features and business models to uncertain customer needs. This adaptation is part of the research discipline of Hypotheses Engineering (HE) where customer needs can be seen as hypotheses that need to be tested iteratively by conducting experiments together with the customer. So far, modeling support and associated traceability of this iterative process are missing. Both, in turn, are important to document the adaptation to the customer needs and identify experiments that provide most evidence to the customer needs. To target this issue, we introduce a model-based HE approach with a twofold contribution: First, we develop a modeling language that models hypotheses and experiments as interrelated hierarchies together with a mapping between them. While the hypotheses are labeled with a score level of their current evidence, the experiments are labeled with a score level of maximum evidence that can be achieved during conduction. Second, we provide an iterative process to determine experiments that offer the most evidence improvement to the modeled hypotheses. We illustrate the usefulness of the approach with an example of testing the business model of a mobile application.
AU - Gottschalk, Sebastian
AU - Yigitbas, Enes
AU - Engels, Gregor
ED - Shishkov, Boris
ID - 16934
KW - Hypothesis Engineering
KW - Model-based
KW - Customer Need Adaptation
KW - Business Model
KW - Product Features
T2 - Business Modeling and Software Design
TI - Model-based Hypothesis Engineering for Supporting Adaptation to Uncertain Customer Needs
VL - 391
ER -
TY - CONF
AU - Triebus, Marcel
AU - Tröster, Thomas
ID - 16939
T2 - Proceedings 4th International Conference Hybrid Materials & Structures
TI - A Holistic Approach to Optimization-Based Design of Hybrid Materials
ER -
TY - GEN
AB - The scientific impact of research papers is multi-dimensional and can be determined quantitatively by means of citation analysis and qualitatively by means of content analysis. Accounting for the widely acknowledged limitations of pure citation analysis, we adopt a knowledge-based perspective on scientific impact to develop a methodology for content-based citation analysis which allows determining how papers have enabled knowledge development in subsequent research (knowledge impact). As knowledge development differs between research genres, we develop a new knowledgebased citation analysis methodology for the genre of standalone literature reviews (LRs). We apply the suggested methodology to the IS business value domain by manually coding 22 LRs and 1,228 citing papers (CPs) and show that the results challenge the assumption that citations indicate knowledge impact. We derive implications for distinguishing knowledge impact from citation impact in the LR genre. Finally, we develop recommendations for authors of LRs, scientific evaluation committees and editorial boards of journals how to apply and benefit from the suggested methodology, and we discuss its efficiency and automatization.
AU - Schryen, Guido
AU - Wagner, Gerit
AU - Benlian, Alexander
ID - 17019
KW - Scientific impact
KW - knowledge impact
KW - content-based citation analysis
KW - methodology
TI - Distinguishing Knowledge Impact from Citation Impact: A Methodology for Analysing Knowledge Impact for the Literature Review Genre
ER -
TY - CONF
AB - Understanding a new literature corpus can be a grueling experience for junior scholars. Nevertheless, corresponding guidelines have not been updated for decades. We contend that the traditional strategy of skimming all papers and reading selected papers afterwards needs to be revised. Therefore, we design a new strategy that guides the overall exploratory process by prioritizing influential papers for initial reading, followed by skimming the remaining papers. Consistent with schemata theory, starting with in-depth reading allows readers to acquire more substantial prior content schemata, which are representa-tive for the literature corpus and useful in the following skimming process. To this end, we develop a prototype that identifies the influential papers from a set of PDFs, which is illustrated in a case study in the IT business value domain. With the new strategy, we envision a more efficient process of exploring unknown literature corpora.
AU - Wagner, Gerit
AU - Empl, Philipp
AU - Schryen, Guido
ID - 17055
KW - Reading and skimming
KW - Exploring literature
KW - Review methodology
KW - Design science research
KW - Schemata theory
T2 - 28th European Conference on Information Systems (ECIS 2020)
TI - Designing a Novel Strategy for Exploring Literature Corpora
ER -
TY - CONF
AU - Dreiling, Dmitrij
AU - Itner, Dominik Thor
AU - Feldmann, Nadine
AU - Gravenkamp, Hauke
AU - Henning, Bernd
ID - 17089
TI - Increasing the sensitivity in the determination of material parameters by using arbitrary loads in ultrasonic transmission measurements
ER -
TY - JOUR
AU - Schryen, Guido
ID - 15414
IS - 9
JF - Communications of the ACM
TI - Integrating Management Science into the HPC Research Ecosystem
VL - 63
ER -
TY - CONF
AU - Claes, Leander
AU - Baumhögger, Elmar
AU - Rüther, Torben
AU - Gierse, Jan
AU - Tröster, Thomas
AU - Henning, Bernd
ID - 15490
T2 - Fortschritte der Akustik - DAGA 2020
TI - Reduction of systematic measurement deviation in acoustic absorption measurement systems
ER -
TY - JOUR
AB - This interview is part of the special issue (01/2020) on “High Performance Business Computing” to be published in the journal Business & Information Systems Engineering. The interviewee Utz-Uwe Haus is Senior Research Engineer @ CRAY European Research Lab (CERL)). A bio of him is included at the end of the interview.
AU - Schryen, Guido
AU - Kliewer, Natalia
AU - Fink, Andreas
ID - 15513
IS - 01/2020
JF - Business & Information Systems Engineering
TI - Interview with Utz-Uwe Haus on “High Performance Computing in Economic Environments: Opportunities and Challenges"
VL - 62
ER -
TY - JOUR
AU - Schryen, Guido
ID - 15022
IS - 1
JF - European Journal of Operational Research
TI - Parallel computational optimization in operations research: A new integrative framework, literature review and research directions
VL - 287
ER -
TY - JOUR
AB - Nonlinear Pancharatnam–Berry phase metasurfaces facilitate the nontrivial phase modulation for frequency conversion processes by leveraging photon‐spin dependent nonlinear geometric‐phases. However, plasmonic metasurfaces show some severe limitation for nonlinear frequency conversion due to the intrinsic high ohmic loss and low damage threshold of plasmonic nanostructures. Here, the nonlinear geometric‐phases associated with the third‐harmonic generation process occurring in all‐dielectric metasurfaces is studied systematically, which are composed of silicon nanofins with different in‐plane rotational symmetries. It is found that the wave coupling among different field components of the resonant fundamental field gives rise to the appearance of different nonlinear geometric‐phases of the generated third‐harmonic signals. The experimental observations of the nonlinear beam steering and nonlinear holography realized in this work by all‐dielectric geometric‐phase metasurfaces are well explained with the developed theory. This work offers a new physical picture to understand the nonlinear optical process occurring at nanoscale dielectric resonators and will help in the design of nonlinear metasurfaces with tailored phase properties.
AU - Liu, Bingyi
AU - Sain, Basudeb
AU - Reineke, Bernhard
AU - Zhao, Ruizhe
AU - Meier, Cedrik
AU - Huang, Lingling
AU - Jiang, Yongyuan
AU - Zentgraf, Thomas
ID - 16197
IS - 9
JF - Advanced Optical Materials
SN - 2195-1071
TI - Nonlinear Wavefront Control by Geometric-Phase Dielectric Metasurfaces: Influence of Mode Field and Rotational Symmetry
VL - 8
ER -
TY - CONF
AB - Network function virtualization (NFV) proposes
to replace physical middleboxes with more flexible virtual
network functions (VNFs). To dynamically adjust to everchanging
traffic demands, VNFs have to be instantiated and
their allocated resources have to be adjusted on demand.
Deciding the amount of allocated resources is non-trivial.
Existing optimization approaches often assume fixed resource
requirements for each VNF instance. However, this can easily
lead to either waste of resources or bad service quality if too
many or too few resources are allocated.
To solve this problem, we train machine learning models
on real VNF data, containing measurements of performance
and resource requirements. For each VNF, the trained models
can then accurately predict the required resources to handle
a certain traffic load. We integrate these machine learning
models into an algorithm for joint VNF scaling and placement
and evaluate their impact on resulting VNF placements. Our
evaluation based on real-world data shows that using suitable
machine learning models effectively avoids over- and underallocation
of resources, leading to up to 12 times lower resource
consumption and better service quality with up to 4.5 times
lower total delay than using standard fixed resource allocation.
AU - Schneider, Stefan Balthasar
AU - Satheeschandran, Narayanan Puthenpurayil
AU - Peuster, Manuel
AU - Karl, Holger
ID - 16219
T2 - IEEE Conference on Network Softwarization (NetSoft)
TI - Machine Learning for Dynamic Resource Allocation in Network Function Virtualization
ER -
TY - JOUR
AB - Timing plays a crucial role in the context of information security investments. We regard timing in two dimensions, namely the time of announcement in relation to the time of investment and the time of announcement in relation to the time of a fundamental security incident. The financial value of information security investments is assessed by examining the relationship between the investment announcements and their stock market reaction focusing on the two time dimensions. Using an event study methodology, we found that both dimensions influence the stock market return of the investing organization. Our results indicate that (1) after fundamental security incidents in a given industry, the stock price will react more positively to a firm’s announcement of actual information security investments than to announcements of the intention to invest; (2) the stock price will react more positively to a firm’s announcements of the intention to invest after the fundamental security incident compared to before; and (3) the stock price will react more positively to a firm’s announcements of actual information security investments after the fundamental security incident compared to before. Overall, the lowest abnormal return can be expected when the intention to invest is announced before a fundamental information security incident and the highest return when actual investing after a fundamental information security incident in the respective industry.
AU - Szubartowicz, Eva
AU - Schryen, Guido
ID - 16249
IS - 1
JF - Journal of Information System Security
KW - Event Study
KW - Information Security
KW - Investment Announcements
KW - Stock Price Reaction
KW - Value of Information Security Investments
TI - Timing in Information Security: An Event Study on the Impact of Information Security Investment Announcements
VL - 16
ER -
TY - CONF
AB - To decide in which part of town to open stores, high street retailers consult statistical data on customers and cities, but they cannot analyze their customers’ shopping behavior and geospatial features of a city due to missing data. While previous research has proposed recommendation systems and decision aids that address this type of decision problem – including factory location and assortment planning – there currently is no design knowledge available to prescribe the design of city center area recommendation systems (CCARS). We set out to design a software prototype considering local customers’ shopping interests and geospatial data on their shopping trips for retail site selection. With real data on 500 customers and 1,100 shopping trips, we demonstrate and evaluate our IT artifact. Our results illustrate how retailers and public town center managers can use CCARS for spatial location selection, growing retailers’ profits and a city center’s attractiveness for its citizens.
AU - zur Heiden, Philipp
AU - Berendes, Carsten Ingo
AU - Beverungen, Daniel
ID - 16285
KW - Town Center Management
KW - High Street Retail
KW - Recommender Systems
KW - Geospatial Recommendations
KW - Design Science Research
T2 - Proceedings of the 15th International Conference on Wirtschaftsinformatik
TI - Designing City Center Area Recommendation Systems
ER -
TY - JOUR
AB - The control of complex systems is of critical importance in many branches of science, engineering, and industry, many of which are governed by nonlinear partial differential equations. Controlling an unsteady fluid flow is particularly important, as flow control is a key enabler for technologies in energy (e.g., wind, tidal, and combustion), transportation (e.g., planes, trains, and automobiles), security (e.g., tracking airborne contamination), and health (e.g., artificial hearts and artificial respiration). However, the high-dimensional, nonlinear, and multi-scale dynamics make real-time feedback control infeasible. Fortunately, these high- dimensional systems exhibit dominant, low-dimensional patterns of activity that can be exploited for effective control in the sense that knowledge of the entire state of a system is not required. Advances in machine learning have the potential to revolutionize flow control given its ability to extract principled, low-rank feature spaces characterizing such complex systems.We present a novel deep learning modelpredictive control framework that exploits low-rank features of the flow in order to achieve considerable improvements to control performance. Instead of predicting the entire fluid state, we use a recurrent neural network (RNN) to accurately predict the control relevant quantities of the system, which are then embedded into an MPC framework to construct a feedback loop. In order to lower the data requirements and to improve the prediction accuracy and thus the control performance, incoming sensor data are used to update the RNN online. The results are validated using varying fluid flow examples of increasing complexity.
AU - Bieker, Katharina
AU - Peitz, Sebastian
AU - Brunton, Steven L.
AU - Kutz, J. Nathan
AU - Dellnitz, Michael
ID - 16290
JF - Theoretical and Computational Fluid Dynamics
SN - 0935-4964
TI - Deep model predictive flow control with limited sensor data and online learning
VL - 34
ER -
TY - GEN
AB - We study the structure of power networks in consideration of local protests against certain
power lines (’not-in-my-backyard’). An application of a network formation game is used to
determine whether or not such protests arise. We examine the existence of stable networks and
their characteristics, when no player wants to make an alteration. Stability within this game is
only reached if each player is sufficiently connected to a power source but is not linked to more
players than necessary. In addition we introduce an algorithm that creates a stable network.
AU - Block, Lukas
ID - 23568
KW - Network formation
KW - NIMBY
KW - Power networks
KW - Nash stability
TI - Network formation with NIMBY constraints
ER -
TY - GEN
AU - Ficara, Elena
AU - d'Agostini, Franca
ID - 30180
T2 - La Stampa
TI - Perché celebrare Hegel? La sua dialettica è un brand, il suo pensiero una febbre benefica
ER -
TY - JOUR
AU - Otroshi, Mortaza
AU - Rossel, Moritz
AU - Meschut, Gerson
ID - 20143
JF - Journal of Advanced Joining Processes
KW - Self-pierce riveting
KW - Ductile fracture
KW - Damage modeling
KW - GISSMO damage model
TI - Stress state dependent damage modeling of self-pierce riveting process simulation using GISSMO damage model
VL - 1
ER -
TY - JOUR
AB - Literature reviews (LRs) play an important role in the development of domain knowledge in all fields. Yet, we observe a
lack of insights into the activities with which LRs actually develop knowledge. To address this important gap, we (1)
derive knowledge building activities from the extant literature on LRs, (2) suggest a knowledge-based typology of LRs
that complements existing typologies, and (3) apply the suggested typology in an empirical study that explores how LRs
with different goals and methodologies have contributed to knowledge development. The analysis of 240 LRs published
in 40 renowned IS journals between 2000 and 2014 allows us to draw a detailed picture of knowledge development
achieved by one of the most important genres in the IS field. An overarching contribution of our work is to unify extant
conceptualizations of LRs by clarifying and illustrating how LRs apply different methodologies in a range of knowledge
building activities to achieve their goals with respect to theory.
AU - Schryen, Guido
AU - Wagner, Gerit
AU - Benlian, Alexander
AU - Paré, Guy
ID - 11946
JF - Communications of the AIS
KW - Literature review
KW - knowledge development
KW - knowledge building activities
KW - knowledge-based typology
KW - information systems research
SN - 1529-3181
TI - A Knowledge Development Perspective on Literature Reviews: Validation of a New Typology in the IS Field
VL - 46
ER -
TY - JOUR
AU - Schryen, Guido
AU - Kliewer, Natalia
AU - Fink, Andreas
ID - 14985
IS - 1
JF - Business & Information Systems Engineering
TI - High Performance Business Computing
VL - 62
ER -
TY - JOUR
AB - In this work we present a set-oriented path following method for the computation of relative global
attractors of parameter-dependent dynamical systems. We start with an initial approximation of the
relative global attractor for a fixed parameter λ0 computed by a set-oriented subdivision method.
By using previously obtained approximations of the parameter-dependent relative global attractor
we can track it with respect to a one-dimensional parameter λ > λ0 without restarting the whole
subdivision procedure. We illustrate the feasibility of the set-oriented path following method by
exploring the dynamics in low-dimensional models for shear flows during the transition to turbulence
and of large-scale atmospheric regime changes .
AU - Gerlach, Raphael
AU - Ziessler, Adrian
AU - Eckhardt, Bruno
AU - Dellnitz, Michael
ID - 16710
JF - SIAM Journal on Applied Dynamical Systems
SN - 1536-0040
TI - A Set-Oriented Path Following Method for the Approximation of Parameter Dependent Attractors
ER -
TY - BOOK
AU - Tönsing, Johanna
ID - 32425
TI - Animalische Epistemologie: Tierwahrheiten bei Franz Kafka am Beispiel von "Ein Bericht für eine Akademie"
ER -
TY - GEN
AU - Hagengruber, Ruth
ID - 21294
SN - ISSN 1553-9172
T2 - H-France Net
TI - Review Hagengruber Le Ru Émilie Du Châtelet Philosophe
VL - 158
ER -
TY - JOUR
AU - Nakatani, Tomohiro
AU - Boeddeker, Christoph
AU - Kinoshita, Keisuke
AU - Ikeshita, Rintaro
AU - Delcroix, Marc
AU - Haeb-Umbach, Reinhold
ID - 17598
JF - IEEE/ACM Transactions on Audio, Speech, and Language Processing
TI - Jointly optimal denoising, dereverberation, and source separation
ER -
TY - CHAP
AU - Süßmann, Johannes
ED - Kamp, Hermann
ED - Schmitz, Sabine
ID - 35032
SN - 978-3-8376-4515-6
T2 - Erinnerungsorte in Belgien. Instrumente lokaler, regionaler und nationaler Sinnstiftung
TI - Albrecht und Isabella in Brüssel. Eine Spurensuche
ER -
TY - JOUR
AB - Der systematischen Reflexion von Praxiserfahrungen anhand von Theorie wird in der Lehrerinnenbildung ein besonders hoher Stellenwert zugeschrieben. Auf Makroebene wurde durch die Einführung des Praxissemesters in NRW auf der einen Seite ein wichtiger Schritt zur stärkeren Verknüpfung von Schulpraxis und universitärer Ausbildung getan. Auf der anderen Seite bestehen auf der Mirkoebene immer noch Herausforderungen in der Relationierung von Theorie und Praxis für Lehramtsstudierende. Hier heißt es für Dozierende, die Lehramtsstudierende während dieses Langzeitpraktikums in universitären Veranstaltungen begleiten, tragfähige Seminarkonzepte zu entwickeln. Der vorliegende Beitrag stellt eine Methode, die Theoriebasierte Fallreflexion (TFR), mit zwei Umsetzungsvarianten vor. Damit wird eine konkrete Möglichkeit dargelegt, wie in Begleitveranstaltungen zum Praxissemester zum einen eine systematische theoretische Analyse und zum anderen die Generierung individueller Handlungsmöglichkeiten für die konkrete Schulpraxis angeleitet werden kann. Des Weiteren werden insgesamt 410 verschiedene Rückmeldungen zur Methode von insgesamt N = 93 Studierenden, welche die TFR im Rahmen einer halbtägigen Blockveranstaltung durchführten, mittels der qualitativen Inhaltsanalyse nach Mayring (2015) kategorisiert. Die Studierenden betonten in ihren Rückmeldungen besonders das Potential der TFR im Hinblick auf ein tieferes Verständnis von theoretischen Inhalten sowie hinsichtlich der Möglichkeiten zum intensiven Austausch mit Kommilitonen*innen sowie zur individuellen Reflexion schulpraktischer Situationen.
AU - Bonanati, Sabrina
AU - Westphal, Petra
AU - Wiethoff, Christoph
ID - 27394
IS - 1
JF - HLZ - Herausforderungen Lehrer*innenbildung
KW - TFR
KW - Theoriebasierte Fallreflexion
KW - Praxissemester
KW - Begleitseminar
KW - Theorie-Praxis-Verzahnung
TI - Theoriebasierte Fallreflexion (TFR) im Praxissemester. Didaktische Umsetzung und Evaluation.
VL - 3
ER -
TY - CONF
AB - Die Themen „Big Data“, „Künstliche Intelligenz und „Data Science“ werden seit einiger Zeit nicht nur in der breiten Öffentlichkeit kontrovers diskutiert, sondern stellen für die Ausbildung in den IT- und IT-nahen Berufen schon heute neue Herausforderungen dar, die in Zukunft durch die gesellschaftliche und technologische Weiterentwicklung hin zu einer Datengesellschaft noch größer werden.
An dieser Stelle stellt sich die Frage, welche Aspekte dieses großen Themenkomplexes für Schule und Ausbildung von Wichtigkeit sind und wie diese Themen sinnstiftend und gewinnbringend in die informatische Ausbildung in verschiedenen Bildungsgängen integriert werden können. Im Rahmen des von uns im Jahr 2017 organisierten Symposiums zum Thema „Data Science“ wurden für die Bildung relevante Aspekte erörtert, wodurch als Kernelemente für den Unterricht Algorithmen der Künstlichen Intelligenz und ihre Anwendung in Industrie und Gesellschaft, Explorationen von Big Data sowie der Umgang mit eigenen Daten in sozialen Netzwerken herausgearbeitet wurden. Ziel ist, aus diesen Themenbereichen sowohl ein umfassendes Curriculum als auch Module für verschiedene Unterrichtsszenarien zu entwickeln und zu erproben. Durch diese Materialien soll es Lehrkräften aus der Informatik, Mathematik oder Technik ermöglicht werden, diese Themen auf Basis des Curriculums und der erprobten Unterrichtskonzepte selbst zu unterrichten.
Hierfür wurde im Rahmen des Projekts ProDaBi (Projekt Data Science und Big Data in der Schule, https://www.prodabi.de), initiiert von der Telekom Stiftung, ein experimenteller Projektkurs entwickelt, den wir mit Schüler:innen der Sekundarstufe II an der Universität Paderborn im Schuljahr 2018/19 durchführten. Dieser Kurs enthält neben einem Modul zur Exploration von Big Data und einem weiteren Modul zum Maschinellen Lernen als Teil der Künstlichen Intelligenz auch eine Projektphase, die es in Zusammenarbeit mit lokalen Unternehmen den Schüler:innen
ermöglicht, das Erlernte in ein reales Data Science-Projekt einzubringen. Aus den Erfahrungen dieses Projektkurses sowie den parallel durchgeführten Erprobungen einzelner Bausteine auch mit beruflichen Schulen werden ab dem Schuljahr 2019/20 die hierfür verwendeten Materialien weiterentwickelt und weiteren Kooperationspartnern zur Erprobung zur Verfügung gestellt. Damit wurden zum Ende des Projekts nicht nur vollständige Unterrichtsmaterialien, sondern auch ein umfassendes Curriculum entwickelt.
AU - Opel, Simone Anna
AU - Schlichtig, Michael
ED - Vollmer, Thomas
ED - Karges, Torben
ED - Richter, Tim
ED - Schlömer, Britta
ED - Schütt-Sayed, Sören
ID - 29298
KW - Berufsbildung
KW - vocational education
KW - Ausbildung
KW - training
KW - berufliche Weiterbildung
KW - advanced vocational education
KW - Digitalisierung
KW - digitalization
KW - Unterricht
KW - teaching
KW - Lehrmethode
KW - teaching method
KW - Interdisziplinarität
KW - interdisciplinarity
KW - Fachdidaktik
KW - subject didactics
KW - Curriculum
KW - curriculum
KW - gewerblich-technischer Beruf
KW - vocational/technical occupation
KW - Fachkraft
KW - specialist
KW - Qualifikationsanforderungen
KW - qualification requirements
KW - Kompetenz
KW - competence
KW - Lehrerbildung
KW - teacher training
KW - Bundesrepublik Deutschland
KW - Federal Republic of Germany
T2 - Sammelband der 27. Fachtagung der BAG Berufliche Bildung
TI - Data Science und Big Data in der beruflichen Bildung – Konzeption und Erprobung eines Projektkurses für die Sekundarstufe II
VL - 55
ER -
TY - GEN
AU - Mildorf, Jarmila
ID - 27371
IS - 2
T2 - Diegesis
TI - Book review: Fictional Dialogue as Poiesis: Elizabeth Alsop’s Making Conversation in Modernist Fiction.
VL - 9
ER -
TY - GEN
AU - Maslovskaya, Sofya
AU - Caillau, Jean-Baptiste
AU - Djema, Walid
AU - Giraldi, Laetitia
AU - Jean-Luc, Jean-Luc
AU - Pomet, Jean-Baptiste
ID - 29546
TI - The turnpike property in maximization of microbial metabolite production
ER -
TY - GEN
AU - Schönhärl, Korinna
AU - Buggeln, Marc
ID - 29550
TI - Die Kosten der Rettung Europas: Schulden- und Steuerkulturen in historischer Perspektive
ER -
TY - CONF
AU - Hoffmann, Max
ED - Siller, Hans-Stefan
ED - Weigel, Wolfgang
ED - Wörler, Jan Franz
ID - 31372
T2 - Beiträge zum Mathematikunterricht 2020
TI - Schnittstellenaktivitäten zum Kongruenzsatz WSW
ER -
TY - JOUR
AU - Gries, Thomas
AU - Redlin, Margarete
ID - 17086
JF - International Economics and Economic Policy
SN - 1612-4804
TI - Trade and economic development: global causality and development- and openness-related heterogeneity
VL - 17
ER -
TY - JOUR
AB - This investigation concentrates on value similarity between parents and their children during adulthood. The interplay between gender, age, relationship quality, and frequency of contact on value similarity was analyzed. A total of 600 adult German children (53.8% women) and their parents took part in a questionnaire study. Value orientation was measured with a short version of Schwartz’s Portrait Values Questionnaire, and relationship quality with the Network of Relationships Inventory (Furman & Buhrmeister, 1992).Value similarity was higher in mother–daughter dyads compared to mother–son dyads, but in the other dyads, no significant differences were found. Regarding relationship quality, verbal intimacy was not related to value similarity. Parental satisfaction was associated with value similarity in the father–child dyads. Satisfaction, as perceived by adult children, was linked to value similarity in mother–child and father–son dyads. Furthermore, the frequency of contact related to value similarity between mothers and sons.
AU - Hoellger, Christian
AU - Sommer, Sabrina
AU - Albert, Isabelle
AU - Buhl, Heike M.
ID - 32559
IS - 6
JF - Journal of Family Issues
KW - Adult child–parent dyads
KW - value similarity
KW - relationship quality
KW - frequency of contact
KW - parent-child-relationship
SN - 0192-513X
TI - Intergenerational Value Similarity in Adulthood
VL - 42
ER -
TY - GEN
AU - Nijholt, Eddie
AU - Rink, Bob
AU - Schwenker, Sören
ID - 33272
IS - April
T2 - DSWeb
TI - Generalised Symmetry in Network Dynamics
ER -
TY - GEN
AU - Steinhardt, Isabel
AU - Fischer, Caroline
AU - Heimstädt, Maximilian
AU - Hirsbrunner, Simon David
AU - Ikiz-Akinci, Dilek
AU - Kressin, Lisa
AU - Kretzer, Susanne
AU - Möllenkamp, Andreas
AU - Portzelt, Maike
AU - Rahal, Rima-Maria
AU - Schimmler, Sonja
AU - Wilke, René
AU - Wünsche, Hannes
ID - 29257
TI - Das Öffnen und Teilen von Daten qualitativer Forschung: eine Handreichung
VL - 6
ER -
TY - JOUR
AB - Openness in science and education is increasing in importance within the digital knowledge society. So far, less attention has been paid to teaching Open Science in bachelor’s degrees or in qualitative methods. Therefore, the aim of this article is to use a seminar example to explore what Open Science practices can be taught in qualitative research and how digital tools can be involved. The seminar focused on the following practices: Open data practices, the practice of using the free and open source tool “Collaborative online Interpretation, the practice of participating, cooperating, collaborating and contributing through participatory technologies and in social (based) networks. To learn Open Science practices, the students were involved in a qualitative research project about “Use of digital technologies for the study and habitus of students”. The study shows the practices of Open Data are easy to teach, whereas the use of free and open source tools and participatory technologies for collaboration, participation, cooperation and contribution is more difficult. In addition, a cultural shift would have to take place within German universities to promote Open Science practices in general.
AU - Steinhardt, Isabel
ID - 29246
IS - 3
JF - Education for Information
KW - Open Science
KW - Open Education Practices
KW - Library and Information Sciences
KW - Education
KW - Information Systems
SN - 0167-8329
TI - Learning Open Science by doing Open Science. A reflection of a qualitative research project-based seminar
VL - 36
ER -
TY - CONF
AU - Heindorf, Stefan
AU - Scholten, Yan
AU - Wachsmuth, Henning
AU - Ngonga Ngomo, Axel-Cyrille
AU - Potthast, Martin
ID - 20141
T2 - Proceedings of the 28th ACM International Conference on Information and Knowledge Management (CIKM 2020)
TI - CauseNet: Towards a Causality Graph Extracted from the Web
ER -
TY - JOUR
AB - Today, organizations must deal with a plethora of IT security threats and to ensure smooth and
uninterrupted business operations, firms are challenged to predict the volume of IT security vulnerabilities
and allocate resources for fixing them. This challenge requires decision makers to assess
which system or software packages are prone to vulnerabilities, how many post-release vulnerabilities
can be expected to occur during a certain period of time, and what impact exploits might have.
Substantial research has been dedicated to techniques that analyze source code and detect security
vulnerabilities. However, only limited research has focused on forecasting security vulnerabilities
that are detected and reported after the release of software. To address this shortcoming, we apply
established methodologies which are capable of forecasting events exhibiting specific time series
characteristics of security vulnerabilities, i.e., rareness of occurrence, volatility, non-stationarity,
and seasonality. Based on a dataset taken from the National Vulnerability Database (NVD), we use
the Mean Absolute Error (MAE) and Root Mean Square Error (RMSE) to measure the forecasting
accuracy of single, double, and triple exponential smoothing methodologies, Croston's methodology,
ARIMA, and a neural network-based approach. We analyze the impact of the applied forecasting
methodology on the prediction accuracy with regard to its robustness along the dimensions of the
examined system and software package "operating systems", "browsers" and "office solutions" and
the applied metrics. To the best of our knowledge, this study is the first to analyze the effect
of forecasting methodologies and to apply metrics that are suitable in this context. Our results
show that the optimal forecasting methodology depends on the software or system package, as some
methodologies perform poorly in the context of IT security vulnerabilities, that absolute metrics
can cover the actual prediction error precisely, and that the prediction accuracy is robust within the
two applied forecasting-error metrics.
AU - Yasasin, Emrah
AU - Prester, Julian
AU - Wagner, Gerit
AU - Schryen, Guido
ID - 13175
IS - January
JF - Computers & Security
SN - 0167-4048
TI - Forecasting IT Security Vulnerabilities - An Empirical Analysis
VL - 88
ER -
TY - GEN
AU - Bielak, Christian Roman
AU - Böhnke, Max
AU - Bobbert, Mathias
AU - Meschut, Gerson
ID - 20344
TI - Development of a numerical method for analyzing the robustness of clinching in versatile process chains
ER -
TY - JOUR
AU - Atorf, Bernhard
AU - Mühlenbernd, Holger
AU - Zentgraf, Thomas
AU - Kitzerow, Heinz-Siegfried
ID - 16301
IS - 6
JF - Optics Express
SN - 1094-4087
TI - All-optical switching of a dye-doped liquid crystal plasmonic metasurface
VL - 28
ER -
TY - CONF
AB - At Paderborn University, a new 6th semester geometry-course for upper secondary student teachers has been designed and taught by the first author of this paper. To show links between academic mathematics and school mathematics we established so-called interface weeks. These are weeks during a course in which lecture, exercises and homework focus on topics that are related to the normal canon of content but specially chosen for their relevance in school contexts. In this article, we want to present our design for an interface week on the topic of congruence. In order to do so, we first illustrate how so-called interface aspects are used to systematize the mathematical background of the topic, thus giving future mathematics teachers the chance to act professionally. We then show examples of learning activities and first results of the accompanying research.
AU - Hoffmann, Max
AU - Biehler, Rolf
ID - 31361
T2 - INDRUM 2020, Université de Carthage, Université de Montpellier, Sep 2020, Cyberspace (virtually from Bizerte), Tunisia
TI - Designing a Geometry Capstone Course for Student Teachers: Bridging the gap between academic mathematics and school mathematics in the case of congruence
ER -
TY - JOUR
AU - Weber, Jutta
ID - 36263
JF - Wissenschaft & Frieden 2020-3: Der kranke Planet. Beilage
TI - Skynet oder Slaughterbots. Schwarmintelligenz in Militär, Politik und Populärkultur
ER -
TY - JOUR
AU - Weber, Jutta
ID - 36265
JF - Technosecurity Cultures, Sonderausgabe „Science as Culture“ (Hg.: Jutta Weber/Katrin M. Kämpf)
TI - Introduction: Technosecurity Cultures
VL - Vol. 29(1)
ER -
TY - JOUR
AB - This paper presents the results of an interlaboratory study of the rheological properties of cement paste and ultrasound gel as reference substance. The goal was to quantify the comparability and reproducibility of measurements of the Bingham parameters yield stress and plastic viscosity when measured on one specific paste composition and one particular ultrasound gel in different laboratories using different rheometers and measurement geometries. The procedures for both in preparing the cement paste and carrying out the rheological measurements on cement paste and ultrasound gel were carefully defined for all of the study’s participants. Different conversion schemes for comparing the results obtained with the different measurement setups are presented here and critically discussed. The procedure proposed in this paper ensured a reasonable comparability of the results with a coefficient of variation for the yield stress of 27% and for the plastic viscosity of 24%, despite the individual measurement series’ having been performed in different labs with different rheometers and measurement geometries.
AU - Haist, Michael
AU - Link, Julian
AU - Nicia, David
AU - Leinitz, Sarah
AU - Baumert, Christian
AU - von Bronk, Tabea
AU - Cotardo, Dario
AU - Eslami Pirharati, Mahmoud
AU - Fataei, Shirin
AU - Garrecht, Harald
AU - Gehlen, Christoph
AU - Hauschildt, Inga
AU - Ivanova, Irina
AU - Jesinghausen, Steffen
AU - Klein, Christopher
AU - Krauss, Hans-W.
AU - Lohaus, Ludger
AU - Lowke, Dirk
AU - Mazanec, Oliver
AU - Pawelczyk, Sebastian
AU - Pott, Ursula
AU - Radebe, Nonkululeko W.
AU - Riedmiller, Joachim Jürgen
AU - Schmid, Hans-Joachim
AU - Schmidt, Wolfram
AU - Secrieru, Egor
AU - Stephan, Dietmar
AU - Thiedeitz, Mareike
AU - Wilhelm, Manfred
AU - Mechtcherine, Viktor
ID - 21949
JF - Materials and Structures
KW - Rheology
KW - Wall Slip
KW - Slip
KW - apparent slip
KW - suspension
KW - cement
KW - concrete
SN - 1359-5997
TI - Interlaboratory study on rheological properties of cement pastes and reference substances: comparability of measurements performed with different rheometers and measurement geometries
ER -
TY - JOUR
AB - Since suspensions (e.g., in food, cement, or cosmetics industries) tend to show wall slip, the application of structured measuring surfaces in rheometers is widespread. Usually, for parallel-plate geometries, the tip-to-tip distance is used for calculation of absolute rheological values, which implies that there is no flow behind this distance. However, several studies show that this is not true. Therefore, the measuring gap needs to be corrected by adding the effective gap extension δ to the prescribed gap height H in order to obtain absolute rheological properties. In this paper, we determine the effective gap extension δ for different structures and fluids (Newtonian, shear thinning, and model suspensions that can be adjusted to the behavior of real fluids) and compare the corrected values to reference data. We observe that for Newtonian fluids a gap- and material-independent correction function can be derived for every measuring system, which is also applicable to suspensions, but not to shear thinning fluids. Since this relation appears to be mainly dependent on the characteristics of flow behaviour, we show that the calibration of structured measuring systems is possible with Newtonian fluids and then can be transferred to suspensions up to a certain particle content.
AU - Pawelczyk, Sebastian
AU - Kniepkamp, Marieluise
AU - Jesinghausen, Steffen
AU - Schmid, Hans-Joachim
ID - 21948
JF - Materials
KW - wall slip prevention
KW - effective gap height
KW - parallel-plate system
KW - structured surfaces
KW - model suspensions
KW - cement paste
KW - fresh concrete
SN - 1996-1944
TI - Absolute Rheological Measurements of Model Suspensions: Influence and Correction of Wall Slip Prevention Measures
ER -
TY - GEN
AU - Weber, Jutta
AU - Nagenborg, Michael
ED - Maasen, Sabine
ED - Dickel, Sascha
ED - Schneider, Christoph
ID - 37505
T2 - TechnoScienceSociety. Technological Reconfigurations of Science and Society. Sociology of the Sciences Yearbook
TI - TechnoSecuritySociety: Catastrophic Futures, Pre-emptive Security & Mass Surveillance
ER -
TY - GEN
AU - Weber, Jutta
AU - Pentenrieder, Annelie
ED - Heßler, Martina
ED - Liggieri, Kevin
ID - 37507
T2 - Technikanthropologie. Handbuch für Wissenschaft und Studium
TI - Lucy Suchman
ER -
TY - GEN
AU - Weber, Jutta
ED - Heßler, Martina
ED - Liggieri, Kevin
ID - 37506
T2 - Technikanthropologie. Handbuch für Wissenschaft und Studium
TI - Donna Haraway
ER -
TY - GEN
AU - Weber, Jutta
ED - Heßler, Martina
ED - Liggieri, Kevin
ID - 37508
T2 - Technikanthropologie. Handbuch für Wissenschaft und Studium
TI - MenschMaschine
ER -
TY - GEN
ED - Weber, Jutta
ED - Kämpf, Katrin
ID - 37536
IS - 1
T2 - Science as Culture
TI - Technosecurity Cultures. Special Issue of ‚Science as Culture‘. Vol. 29(1), März 2020
ER -
TY - CONF
AU - Krumme, Matthias
AU - Webersen, Manuel
AU - Claes, Leander
AU - Webersen, Yvonne
ID - 13943
T2 - Fortschritte der Akustik - DAGA 2020
TI - Analoge Klangsynthese zur Vermittlung von Grundkenntnissen der Signalverarbeitung an Studierende nicht-technischer Fachrichtungen
ER -
TY - JOUR
AB - AbstractAs time-to-market is getting shorter, customer needs have to be identified as early as possible in product development. Correctly applied, corporate foresight can give a glimpse into the future to anticipate such needs and thus gain a competitive advantage. A support tool to choose the appropriate method of foresight is not available yet. Thus, a literature study on foresight methods in industry is performed and a novel decision support tool is proposed which avoids high entrepreneurial risks. Based on the findings, potentials for future work are identified for different types of methods.
AU - Gräßler, Iris
AU - Thiele, Henrik
AU - Scholle, P.
ID - 23436
JF - Proceedings of the DESIGN 2020 16th International Design Conference
SN - 2633-7762
TI - ASSESSING THE FUTURE: METHODS AND CRITERIA
VL - 1
ER -
TY - JOUR
AU - Thiele, Henrik
AU - Weber, Sebastian
AU - Reichwein, Jannik
AU - Bartolo, Joseph A.
AU - Tchana, Yvan
AU - Jimenez, Lucas
AU - Borg, Jonathan C.
ID - 23490
JF - Proceedings of the DESIGN 2020 16th International Design Conference, 26. - 29. Okt. 2020
TI - A Scrum Agile Integrated Development Framework
VL - 1
ER -
TY - BOOK
AU - Bonanati, Sabrina
AU - Greiner, Christian
AU - Gruchel, Nicole
AU - Buhl, Heike M.
ID - 32463
TI - Lesekompetenz fördern. Ein Manual für das LIFE-Programm zur Stärkung der Zusammenarbeit von Schule und Elternhaus
ER -
TY - JOUR
AU - Gräßler, Iris
AU - Scholle, Philipp
AU - Thiele, Henrik
ID - 23463
JF - Proceedings of the DESIGN 2020 16th International Design Conference; 26. - 29. Okt. 2020
TI - Improving scenario-technique by a semi-automatized consistency assessment based on pattern recognition by artificial neural networks
VL - 1
ER -
TY - THES
AU - Gense, Alexander
ID - 42068
TI - Mechatronischer Entwurf eines geregelten Federungssystems für mittelschwere gepanzerte Kettenfahrzeuge
ER -
TY - THES
AU - Bertelsmeier, Fabian
ID - 42067
TI - Produkttolerante Automation zellenbasierter Fertigungssysteme
ER -
TY - JOUR
AU - Gharibian, Sevag
AU - Aldi, Marco
AU - de Beaudrap, Niel
AU - Saeedi, Seyran
ID - 16927
JF - Communications in Mathematical Physics
TI - On efficiently solvable cases of Quantum k-SAT
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 38144
IS - 3
JF - Journal for the Theory of Social Behaviour
TI - Towards a Critical Theory of Communication as Renewal and Update of Marxist Humanism in the Age of Digital Capitalism
VL - 50
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 38139
IS - 1
JF - tripleC: Communication, Capitalism & Critique
TI - Communicative Socialism/Digital Socialism
VL - 18
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 38163
IS - 1
JF - tripleC: Communication, Capitalism & Critique
TI - Alltagsleben und Alltagskommunikation im Coronavirus-Kapitalismus
VL - 18
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 38161
IS - 1
JF - tripleC: Communication
TI - Everyday Life and Everyday Communication in Coronavirus Capitalism
VL - 18
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 38140
IS - 1
JF - tripleC: Communication, Capitalism & Critique
TI - The Utopian Internet, Computing, Communication, and Concrete Utopias
VL - 18
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 38142
IS - 3
JF - Humanity & Society
TI - Erich Fromm and the Critical Theory of Communication
VL - 44
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 38137
IS - 2
JF - Journal of Media Ethics
TI - The Ethics of the Digital Commons
VL - 35
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 42486
IS - 2
JF - MATRIZes
TI - Vida e comunicação cotidianas no capitalism da coronavirus
VL - 14
ER -
TY - JOUR
AB - Thermally stabilized and subsequently carbonized nanofibers are a promising material for many technical applications in fields such as tissue engineering or energy storage. They can be obtained from a variety of different polymer precursors via electrospinning. While some methods have been tested for post-carbonization doping of nanofibers with the desired ingredients, very little is known about carbonization of blend nanofibers from two or more polymeric precursors. In this paper, we report on the preparation, thermal treatment and resulting properties of poly(acrylonitrile) (PAN)/poly(vinylidene fluoride) (PVDF) blend nanofibers produced by wire-based electrospinning of binary polymer solutions. Using a wide variety of spectroscopic, microscopic and thermal characterization methods, the chemical and morphological transition during oxidative stabilization (280 °C) and incipient carbonization (500 °C) was thoroughly investigated. Both PAN and PVDF precursor polymers were detected and analyzed qualitatively and quantitatively during all stages of thermal treatment. Compared to pure PAN nanofibers, the blend nanofibers showed increased fiber diameters, strong reduction of undesired morphological changes during oxidative stabilization and increased conductivity after carbonization.
AU - Wortmann, Martin
AU - Frese, Natalie
AU - Mamun, Al
AU - Trabelsi, Marah
AU - Keil, Waldemar
AU - Büker, Björn
AU - Javed, Ali
AU - Tiemann, Michael
AU - Moritzer, Elmar
AU - Ehrmann, Andrea
AU - Hütten, Andreas
AU - Schmidt, Claudia
AU - Gölzhäuser, Armin
AU - Hüsgen, Bruno
AU - Sabantina, Lilia
ID - 25901
JF - Nanomaterials
SN - 2079-4991
TI - Chemical and Morphological Transition of Poly(acrylonitrile)/Poly(vinylidene Fluoride) Blend Nanofibers during Oxidative Stabilization and Incipient Carbonization
ER -
TY - JOUR
AB - Large Co-MOF-74 crystals of a few hundred micrometers were prepared by solvothermal synthesis, and their structure and morphology were characterized by scanning electron microscopy (SEM), IR, and Raman spectroscopy. The hydrothermal stability of the material up to 60 °C at 93% relative humidity was verified by temperature-dependent XRD. Proton conductivity was studied by impedance spectroscopy, using a single crystal. By varying the relative humidity (70–95%), temperature (21–60 °C), and orientation of the crystal relative to the electrical potential, it was found that proton conduction occurs predominantly through the linear, unidirectional (1D) micropore channels of Co-MOF-74, and that water molecules inside the channels are responsible for the proton mobility by a Grotthuss-type mechanism.
AU - Javed, Ali
AU - Strauss, Ina
AU - Bunzen, Hana
AU - Caro, Jürgen
AU - Tiemann, Michael
ID - 25899
JF - Nanomaterials
SN - 2079-4991
TI - Humidity-Mediated Anisotropic Proton Conductivity through the 1D Channels of Co-MOF-74
ER -
TY - CONF
AU - Hetkämper, Tim
AU - Krumme, Matthias
AU - Dreiling, Dmitrij
AU - Claes, Leander
ID - 19502
T2 - SEFI 48th Annual Conference Proceedings - Engaging Engineering Education
TI - A modular, scalable open-hardware platform for project-based laboratory courses in electrical engineering studies
ER -
TY - GEN
AB - Die Autor*innen werfen einen medienwissenschaftlichen Blick auf die Online-Lehre des Sommersemsters 2020. Dabei betrachten sie unter anderem den Unterschied von klassischen Hörsälen zu den neuen, virtuellen Lernräumen, die aber auch physische Elemente beinhalten. Dabei regen sie an, den Einsatz von Lehr-Lern-Plattformen kritisch zu diskutieren und insgesamt die Lehre mit andauernder Medienreflexion zu begleiten. Ein zentraler Punkt des Papiers ist das Aufzeigen von Inklusions- und Exklusionspotenzialen von Online-Lehre. Vermeintliche Selbstverständnisse spielen hier eine Schlüsselrolle. So wird zum Beispiel häufig eine gewisse technische Infrastruktur seitens der Studierenden vorausgesetzt, die nicht immer vorhanden ist. Andererseits entfallen physische Barrieren, die in Lehrgebäuden vorhanden wären. Die Autor*innen mahnen, bei der Konzeption von Online-Lehre zu vermeiden, nicht-behinderte Personen als die Norm anzunehmen und stattdessen von verschiedenen Körperlichkeiten her zu denken, um die positive Potenziale dieses Lehrmodus zu nutzen. Das Diskussionspapier widmet sich auch ausführlich dem Einsatz von (digitalen) Tools, die weniger als Werkzeuge, denn als Medien der Lehre verstanden werden.
AU - Bohnenkamp, Björn
AU - Burkhardt, Marcus
AU - Grashöfer, Katja
AU - Hlukhovych, Adrianna
AU - Krewani, Angela
AU - Matzner, Tobias
AU - Missomelius, Petra
AU - Raczkowski, Felix
AU - Shnayien, Mary
AU - Weich, Andreas
AU - Wippich, Uwe
ID - 35179
TI - Online-Lehre 2020 – Eine medienwissenschaftliche Perspektive. Diskussionspapier Nr. 10
ER -
TY - JOUR
AB - Die vorübergehende Umstellung der Lehre von Präsenz- auf alternative Formate (sowohl online als auch offline) ist nicht nur eine logistische Herausforderung, sondern hat auch eine medientheoretische und eine wissenschaftspolitische Dimension. Gerade als Medienwissenschaftler_innen sollten wir in dieser Hinsicht reflektiert vorgehen, denn wir haben es mit einer Frage der Übersetzbarkeit von Inhalten zwischen unterschiedlichen Medien zu tun. Der Versuch, Lehrinhalte vom Medium des Sprechens und Diskutierens vor Ort in das Medium etwa einer Konferenzschaltung oder einer kollaborativen schriftlichen Textkommentierung zu übersetzen, verändert diese Inhalte. Wenn wir neue Formate für die Lehre unter besonderen Bedingungen ausprobieren, sollten wir uns die medienwissenschaftliche Prämisse, dass das Medium die Botschaft ist, ständig vor Augen halten. Deshalb schlagen wir vor, diese Aufgabe als ein medienwissenschaftliches Experiment zu betrachten und dieses Experiment im kommenden Semester nicht nur zum Medium, sondern auch zum Inhalt unserer Seminare zu machen.
AU - Heinke, Christian
AU - Shnayien, Mary
AU - Sprenger, Florian
AU - Wippich, Uwe
ID - 35180
JF - -
TI - Lehre unter besonderen Bedingungen. Leitfaden zur temporären Umstellung der Lehre auf Online-Formate
ER -
TY - BOOK
AB - Digital media are transformative: they (re)shape the ways of communicating, relating, doing, knowing, and living as much as they are themselves subject to continuous transformation. The contributions in this volume explore these contemporary shifts in and of digital cultures by analyzing a wide range of topics: from data, infrastructures, algorithms, logistics, economies, politics, identities, collectives […] It’s Open Access! Check it out!
ED - Burkhardt, Marcus
ED - Grashöfer, Katja
ED - Shnayien, Mary
ID - 35177
TI - Explorations in Digital Cultures
ER -
TY - JOUR
AB - Jugend wird als eine eigenständige Lebens- und Entwicklungsphase betrachtet. Für junge Geflüchtete stellt sie eine besondere Herausforderung dar. Für sie geht es nicht nur um die Bewältigung alterstypischer Entwicklungsaufgaben, sondern auch um eine gelingende Integration in die Aufnahmegesellschaft. Dazu gehören u. a. das Kennenlernen und die Aneignung von Sprache, Kultur und Werten, genauso die Erschließung von Alltagsräumen und Lebenswelten, z. B. von Freizeitmöglichkeiten, Bildung und von beruflichen Erfahrungsräumen. Die Frage zur gelingenden Integration und Gestaltung von Lebenswelten junger Geflüchteter wurde im Kontext der wissenschaftlichen Begleitung des Projekts „angekommen in Deiner Stadt“ der Walter Blüchert Stiftung genauer untersucht. Der Beitrag referiert u. a. die Ergebnisse einer in diesem Kontext durchgeführten egozentrierten Netzwerkanalyse. Die Ergebnisse zeigen, dass die Angebote den Rahmen für den Aufbau und die Erweiterung kommunikativer, sozialer Netzwerke darstellen und lebensweltliche Zugänge öffnen.
AU - Heisler, Dietmar
AU - Schemmer, Susanne
ID - 37014
JF - BWP@ Berufs- und Wirtschaftspädagogik - online
KW - Jugend
KW - Lebensweltorientierung
KW - soziale Netzwerke
KW - geflüchtete Jugendliche
KW - Lebenslagen junger Geflüchteter und Zugewanderter
TI - Lebenswelten und soziale Netzwerke von jungen Geflüchteten und Zugewanderten am Übergang in Ausbildung und Beruf.
ER -
TY - BOOK
ED - Heisler, Dietmar
ID - 36992
TI - Digitalisierung am Übergang Schule Beruf. Ansätze und Perspektiven in Arbeitsdomänen und beruflicher Förderung
VL - 56
ER -
TY - JOUR
AB - Polarons in dielectric crystals play a crucial role for applications in integrated electronics and optoelectronics. In this work, we use density-functional theory and Green's function methods to explore the microscopic structure and spectroscopic signatures of electron polarons in lithium niobate (LiNbO3). Total-energy calculations and the comparison of calculated electron paramagnetic resonance data with available measurements reveal the formation of bound
polarons at Nb_Li antisite defects with a quasi-Jahn-Teller distorted, tilted configuration. The defect-formation energies further indicate that (bi)polarons may form not only at
Nb_Li antisites but also at structures where the antisite Nb atom moves into a neighboring empty oxygen octahedron. Based on these structure models, and on the calculated charge-transition levels and potential-energy barriers, we propose two mechanisms for the optical and thermal splitting of bipolarons, which provide a natural explanation for the reported two-path recombination of bipolarons. Optical-response calculations based on the Bethe-Salpeter equation, in combination with available experimental data and new measurements of the optical absorption spectrum, further corroborate the geometries proposed here for free and defect-bound (bi)polarons.
AU - Schmidt, Falko
AU - Kozub, Agnieszka L.
AU - Biktagirov, Timur
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Schindlmayr, Arno
AU - Schmidt, Wolf Gero
AU - Gerstmann, Uwe
ID - 19190
IS - 4
JF - Physical Review Research
TI - Free and defect-bound (bi)polarons in LiNbO3: Atomic structure and spectroscopic signatures from ab initio calculations
VL - 2
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 41432
IS - 1
JF - tripleC: Communication, Capitalism & Critique
TI - Communicative Socialism/Digital Socialism
VL - 18
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 42485
IS - 2
JF - tripleC: Communication, Capitalism & Critique
TI - Preface to Manfred Knoche’s Article “Science Communication and Open Access: The Critique of the Political Economy of Capitalist Academic Publishers as Ideology Critique”
VL - 18
ER -