TY - CONF
AU - Sander, Sascha
AU - Teutenberg, Dominik
AU - Meschut, Gerson
AU - Kötz, Fabian
AU - Matzenmiller, Anton
AU - Kasper, Yann
AU - Ummenhofer, Thomas
ID - 29342
T2 - 22. Kolloquium Gemeinsame Forschung in der Klebtechnik
TI - Methodenentwicklung zur rechnerischen Auslegung geklebter Stahlverbindungen unter Alterungsbeanspruchung im Stahl- und Anlagenbau
ER -
TY - GEN
AU - Peters, Lukas
ID - 29343
TI - Vom Bewertungssystem zur Produktplanung - Eine Taxonomie zu Bewertungssystemen aus Sicht der Produktplanung
ER -
TY - JOUR
AB - The paper investigates the impact of individual attention on investor risk-taking. We analyze a large sample of trading records from a brokerage service that allows its customers to trade contracts-for-differences (CFD), and sends standardized push messages on recent stock performance to its client investors. The advantage of this sample is that it allows us to isolate the "push" messages as individual attention triggers, which we can directly link to the same individuals' risk-taking. A particular advantage of CFD trading is that it allows investors to make use of leverage, which provides us a pure measure of investors' willingness to take risks that is independent of the decision to purchase a particular stock. Leverage is a major catalyst of speculative trading, as it increases the scope of extreme returns, and enables investors to take larger positions than what they can afford with their own capital. We show that investors execute attention-driven trades with higher leverage, compared to their other trades, as well as those of other investors who are not alerted by attention triggers.
AU - Arnold, Marc
AU - Pelster, Matthias
AU - Subrahmanyam, Marti G.
ID - 21571
IS - 2
JF - Journal of Financial Economics
TI - Attention triggers and investors' risk-taking
VL - 143
ER -
TY - CONF
AB - This paper introduces the project Scale4Edge. The project is focused on enabling an effective RISC-V ecosystem for optimization of edge applications. We describe the basic components of this ecosystem and introduce the envisioned
demonstrators, which will be used in their evaluation.
AU - Ecker, Wolfgang
AU - Adelt, Peer
AU - Müller, Wolfgang
AU - Heckmann, Reinhold
AU - Krstic, Milos
AU - Herdt, Vladimir
AU - Drechsler, Rolf
AU - Angst, Gerhard
AU - Wimmer, Ralf
AU - Mauderer, Andreas
AU - Stahl, Rafael
AU - Emrich, Karsten
AU - Mueller-Gritschneder, Daniel
AU - Becker, Bernd
AU - Scholl, Philipp
AU - Jentzsch, Eyck
AU - Schlamelcher, Jan
AU - Grüttner, Kim
AU - Bernardo, Paul Palomero
AU - Brinkmann, Oliver
AU - Damian, Mihaela
AU - Oppermann, Julian
AU - Koch, Andreas
AU - Bormann, Jörg
AU - Partzsch, Johannes
AU - Mayr, Christian
AU - Kunz, Wolfgang
ID - 29302
T2 - In Proceedings of the Design Automation and Test Conference and Exhibition (DATE 2022)
TI - The Scale4Edge RISC-V Ecosystem
ER -
TY - JOUR
AU - Schmolke, Tobias
AU - Krüger, Christopher
AU - Merdivan, David
AU - Meschut, Gerson
ID - 29295
IS - 1
JF - ATZ - Automobiltechnische Zeitschrift
TI - Gewichtsoptimierte Batteriegehäuse für Volumenfahrzeuge
VL - 124
ER -
TY - CHAP
AU - Mildorf, Jarmila
ED - Schachtner, Christina
ED - Drews, Albert
ID - 29355
T2 - Erzählte Welt: Sinnstiftung in Zeiten kultureller und politischer Umbrüche
TI - Durch Andere sich selbst erzählen: Figuren der Selbststilisierung in autobiographischen Schriften von Alan Bennett und Candia McWilliam
VL - 9
ER -
TY - JOUR
AB - Friction-spinning as an innovative incremental forming process enables high degrees of deformation in the field of tube and sheet metal forming due to self-induced heat generation in the forming area. The complex thermomechanical conditions generate non-uniform residual stress distributions. In order to specifically adjust these residual stress distributions, the influence of different process parameters on residual stress distributions in flanges formed by the friction-spinning of tubes is investigated using the design of experiments (DoE) method. The feed rate with an effect of −156 MPa/mm is the dominating control parameter for residual stress depth distribution in steel flange forming, whereas the rotation speed of the workpiece with an effect of 18 MPa/mm dominates the gradient of residual stress generation in the aluminium flange-forming process. A run-to-run predictive control system for the specific adjustment of residual stress distributions is proposed and validated. The predictive model provides an initial solution in the form of a parameter set, and the controlled feedback iteratively approaches the target value with new parameter sets recalculated on the basis of the deviation of the previous run. Residual stress measurements are carried out using the hole-drilling method and X-ray diffraction by the cosα-method.
AU - Dahms, Frederik
AU - Homberg, Werner
ID - 29357
IS - 1
JF - Metals
KW - General Materials Science
KW - Metals and Alloys
SN - 2075-4701
TI - Manufacture of Defined Residual Stress Distributions in the Friction-Spinning Process: Investigations and Run-to-Run Predictive Control
VL - 12
ER -
TY - JOUR
AU - Sperling, Martina
AU - Schryen, Guido
ID - 23415
IS - 2
JF - European Journal of Operational Research (EJOR)
TI - Decision Support for Disaster Relief: Coordinating Spontaneous Volunteers
VL - 299
ER -
TY - JOUR
AB - Hamiltonian systems are differential equations which describe systems in classical mechanics, plasma physics, and sampling problems. They exhibit many structural properties, such as a lack of attractors and the presence of conservation laws. To predict Hamiltonian dynamics based on discrete trajectory observations, incorporation of prior knowledge about Hamiltonian structure greatly improves predictions. This is typically done by learning the system's Hamiltonian and then integrating the Hamiltonian vector field with a symplectic integrator. For this, however, Hamiltonian data needs to be approximated based on the trajectory observations. Moreover, the numerical integrator introduces an additional discretisation error. In this paper, we show that an inverse modified Hamiltonian structure adapted to the geometric integrator can be learned directly from observations. A separate approximation step for the Hamiltonian data avoided. The inverse modified data compensates for the discretisation error such that the discretisation error is eliminated. The technique is developed for Gaussian Processes.
AU - Offen, Christian
AU - Ober-Blöbaum, Sina
ID - 23382
JF - Chaos: An Interdisciplinary Journal of Nonlinear Science
TI - Symplectic integration of learned Hamiltonian systems
VL - 32(1)
ER -
TY - JOUR
AU - Koldewey, Christian
AU - Rasor, Anja
AU - Reinhold, Jannik
AU - Gausemeier, Jürgen
AU - Dumitrescu, Roman
AU - Chohan, Nadia
AU - Frank, Maximilian
ID - 27776
JF - Technological Forecasting and Social Change
SN - 0040-1625
TI - Aligning strategic position, behavior, and structure for smart service businesses in manufacturing
ER -
TY - CONF
AB - We study the complexity of problems solvable in deterministic polynomial time
with access to an NP or Quantum Merlin-Arthur (QMA)-oracle, such as $P^{NP}$
and $P^{QMA}$, respectively. The former allows one to classify problems more
finely than the Polynomial-Time Hierarchy (PH), whereas the latter
characterizes physically motivated problems such as Approximate Simulation
(APX-SIM) [Ambainis, CCC 2014]. In this area, a central role has been played by
the classes $P^{NP[\log]}$ and $P^{QMA[\log]}$, defined identically to $P^{NP}$
and $P^{QMA}$, except that only logarithmically many oracle queries are
allowed. Here, [Gottlob, FOCS 1993] showed that if the adaptive queries made by
a $P^{NP}$ machine have a "query graph" which is a tree, then this computation
can be simulated in $P^{NP[\log]}$.
In this work, we first show that for any verification class
$C\in\{NP,MA,QCMA,QMA,QMA(2),NEXP,QMA_{\exp}\}$, any $P^C$ machine with a query
graph of "separator number" $s$ can be simulated using deterministic time
$\exp(s\log n)$ and $s\log n$ queries to a $C$-oracle. When $s\in O(1)$ (which
includes the case of $O(1)$-treewidth, and thus also of trees), this gives an
upper bound of $P^{C[\log]}$, and when $s\in O(\log^k(n))$, this yields bound
$QP^{C[\log^{k+1}]}$ (QP meaning quasi-polynomial time). We next show how to
combine Gottlob's "admissible-weighting function" framework with the
"flag-qubit" framework of [Watson, Bausch, Gharibian, 2020], obtaining a
unified approach for embedding $P^C$ computations directly into APX-SIM
instances in a black-box fashion. Finally, we formalize a simple no-go
statement about polynomials (c.f. [Krentel, STOC 1986]): Given a multi-linear
polynomial $p$ specified via an arithmetic circuit, if one can "weakly
compress" $p$ so that its optimal value requires $m$ bits to represent, then
$P^{NP}$ can be decided with only $m$ queries to an NP-oracle.
AU - Gharibian, Sevag
AU - Rudolph, Dorian
ID - 27160
IS - 75
T2 - 13th Innovations in Theoretical Computer Science (ITCS 2022)
TI - On polynomially many queries to NP or QMA oracles
VL - 215
ER -
TY - CONF
AB - Explainable Artificial Intelligence (XAI) is currently an important topic for the application of Machine Learning (ML) in high-stakes decision scenarios. Related research focuses on evaluating ML algorithms in terms of interpretability. However, providing a human understandable explanation of an intelligent system does not only relate to the used ML algorithm. The data and features used also have a considerable impact on interpretability. In this paper, we develop a taxonomy for describing XAI systems based on aspects about the algorithm and data. The proposed taxonomy gives researchers and practitioners opportunities to describe and evaluate current XAI systems with respect to interpretability and guides the future development of this class of systems.
AU - Kucklick, Jan-Peter
ID - 29539
KW - Explainable Artificial Intelligence
KW - XAI
KW - Interpretability
KW - Decision Support Systems
KW - Taxonomy
T2 - Wirtschaftsinformatik 2022 Proceedings
TI - Towards a model- and data-focused taxonomy of XAI systems
ER -
TY - GEN
AU - Lienen, Christian
AU - Platzner, Marco
ID - 29541
TI - ReconROS Executor: Event-Driven Programming of FPGA-accelerated ROS 2 Applications
ER -
TY - GEN
AB - Koopman operator theory has been successfully applied to problems from various research areas such as fluid dynamics, molecular dynamics, climate science, engineering, and biology. Applications include detecting metastable or coherent sets, coarse-graining, system identification, and control. There is an intricate connection between dynamical systems driven by stochastic differential equations and quantum mechanics. In this paper, we compare the ground-state transformation and Nelson's stochastic mechanics and demonstrate how data-driven methods developed for the approximation of the Koopman operator can be used to analyze quantum physics problems. Moreover, we exploit the relationship between Schrödinger operators and stochastic control problems to show that modern data-driven methods for stochastic control can be used to solve the stationary or imaginary-time Schrödinger equation. Our findings open up a new avenue towards solving Schrödinger's equation using recently developed tools from data science.
AU - Klus, Stefan
AU - Nüske, Feliks
AU - Peitz, Sebastian
ID - 29673
T2 - arXiv:2201.12062
TI - Koopman analysis of quantum systems
ER -
TY - JOUR
AU - Borgert, Thomas
AU - Homberg, Werner
ID - 29719
JF - Energy Reports
KW - General Energy
SN - 2352-4847
TI - Energy saving potentials of an efficient recycling process of different aluminum rejects
VL - 8
ER -
TY - CHAP
AB - The digitalization of workplaces can introduce changes on various levels of work activities. Educational research follows this transformation in one of two ways: On the one hand, there is the optimistic perspective of expecting to improve the quality of work and work life; on the other hand, there is the expectation that conditions of work and work life will generally deteriorate. Irrespective of the concrete outcomes of digitalization, a general agreement exists that digitalization will induce changes at workplaces that affect individuals and the tasks they do. At the same time, however, scholars disagree as to whether employees experience these changes in terms of affordances that engage them into learning new processes or if they experience constraints that inhibit further engagement in learning.
This chapter explores the particular developments covered under the topic of digitalization at and of work, explains particular challenges of the introduction of cyber-physical systems and analyzes consequences for workplace learning. It focuses on conceptual change as a theoretical framework for understanding the quality of learning processes that seem inevitable in order to cope with the new requirements and – more importantly – to use the potentials of the new technologies. It then sketches the poor state of empirical research conducted in this area – so far limited to exploratory field studies – even in times of corona, which has boosted the digital transformation. The chapter ends with a description of the potential and problems of – at best interdisciplinary – research into learning at digitalized workplaces.
AU - Harteis, Christian
AU - Goller, Michael
AU - Gerholz, Karl-Heinz
ED - Malloch, Margaret
ED - Cairns, Len
ED - Evans, Karen
ED - O'Connor, Bridget N.
ID - 29104
SN - 978-1-5264-9111-4
T2 - The SAGE Handbook of Learning and Work
TI - Digitalization of work: Challenges for workplace learning
ER -
TY - JOUR
AB - Im Praxissemester (PS) sind Mentor*innen für Studierende wichtige Bezugspersonen, die sie u. a. bei der Planung, Durchführung und Reflexion von Unterricht begleiten. Während z.B. zur Kompetenzentwicklung Studierender im PS mehrere Erkenntnisse vorliegen, ist die Perspektive von Mentor*innen bisher wenig untersucht. Dieser Bericht zielt darauf, die Relevanz von Mentor*innen herauszuarbeiten, Forschungsdesiderate zu umreißen und Handlungsoptionen aufzuzeigen.
AU - Caruso, Carina
AU - Goller, Michael
ID - 29103
IS - 4
JF - Die Deutsche Schule
KW - Schlagwörter: Mentoring
KW - Praxissemester
KW - Professionalisierung
TI - Die Relevanz von Mentor*innen für die Professionalisierung von angehenden Lehrkräften im Praxissemester: Forschungsdesiderate und Handlungsoptionen
VL - 114
ER -
TY - JOUR
AB - Many-body perturbation theory based on density-functional theory calculations is used to determine the quasiparticle band structures and the dielectric functions of the isomorphic ferroelectrics rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenide (KTiOAsO4). Self-energy corrections of more than 2 eV are found to widen the transport band gaps of both materials considerably to 5.3 and 5.2 eV, respectively. At the same time, both materials are characterized by strong exciton binding energies of 1.4 and 1.5 eV, respectively. The solution of the Bethe-Salpeter equation based on the quasiparticle energies results in onsets of the optical absorption within the range of the measured data.
AU - Neufeld, Sergej
AU - Schindlmayr, Arno
AU - Schmidt, Wolf Gero
ID - 26627
IS - 1
JF - Journal of Physics: Materials
TI - Quasiparticle energies and optical response of RbTiOPO4 and KTiOAsO4
VL - 5
ER -
TY - CHAP
AU - Wohlleben, Meike Claudia
AU - Bender, Amelie
AU - Peitz, Sebastian
AU - Sextro, Walter
ID - 29727
SN - 0302-9743
T2 - Machine Learning, Optimization, and Data Science
TI - Development of a Hybrid Modeling Methodology for Oscillating Systems with Friction
ER -
TY - THES
AB - Modern-day communication has become more and more digital. While this comes with many advantages such as a more efficient economy, it has also created more and more opportunities for various adversaries to manipulate communication or eavesdrop on it. The Snowden revelations in 2013 further highlighted the seriousness of these threats. To protect the communication of people, companies, and states from such threats, we require cryptography with strong security guarantees.
Different applications may require different security properties from cryptographic schemes. For most applications, however, so-called adaptive security is considered a reasonable minimal requirement of security. Cryptographic schemes with adaptive security remain secure in the presence of an adversary that can corrupt communication partners to respond to messages of the adversaries choice, while the adversary may choose the messages based on previously observed interactions.
While cryptography is associated the most with encryption, this is only one of many primitives that are essential for the security of digital interactions. This thesis presents novel identity-based encryption (IBE) schemes and verifiable random functions (VRFs) that achieve adaptive security as outlined above. Moreover, the cryptographic schemes presented in this thesis are proven secure in the standard model. That is without making use of idealized models like the random oracle model.
AU - Niehues, David
ID - 29763
KW - public-key cryptography
KW - lattices
KW - pairings
KW - verifiable random functions
KW - identity-based encryption
TI - More Efficient Techniques for Adaptively-Secure Cryptography
ER -