@inproceedings{22264,
author = {Göddecke, Johannes and Meschut, Gerson},
booktitle = {11. Doktorandenseminar Klebtechnik},
location = {Aachen},
publisher = {DVS Media GmbH},
title = {{Experimentelle Untersuchung der Dämpfungseigenschaften geklebter Strukturen unter dynamischer Beanspruchung}},
year = {2021},
}
@inproceedings{22276,
author = {Böhne, Christoph and Meschut, Gerson and Biegler, Max and Rethmeier, Michael},
location = {virtual event},
title = {{Practical methods for avoidance of liquid metal embrittlement in resistance spot welds of advanced high strength steels}},
year = {2021},
}
@article{21374,
abstract = {A dark-field scanning transmission ion microscopy detector was designed for the helium ion microscope. The detection principle is based on a secondary electron conversion holder with an exchangeable aperture strip allowing its acceptance angle to be tuned from 3 to 98 mrad. The contrast mechanism and performance were investigated using freestanding nanometer-thin carbon membranes. The results demonstrate that the detector can be optimized either for most efficient signal collection or for maximum image contrast. The designed setup allows for the imaging of thin low-density materials that otherwise provide little signal or contrast and for a clear end-point detection in the fabrication of nanopores. In addition, the detector is able to determine the thickness of membranes with sub-nanometer precision by quantitatively evaluating the image signal and comparing the results with Monte Carlo simulations. The thickness determined by the dark-field transmission detector is compared to X-ray photoelectron spectroscopy and energy-filtered transmission electron microscopy measurements.},
author = {Emmrich, Daniel and Wolff, Annalena and Meyerbröker, Nikolaus and Lindner, Jörg and Beyer, André and Gölzhäuser, Armin},
issn = {2190-4286},
journal = {Beilstein Journal of Nanotechnology},
pages = {222--231},
title = {{Scanning transmission helium ion microscopy on carbon nanomembranes}},
doi = {10.3762/bjnano.12.18},
year = {2021},
}
@inproceedings{22283,
abstract = { We show how to construct an overlay network of constant degree and diameter $O(\log n)$ in time $O(\log n)$ starting from an arbitrary weakly connected graph.
We assume a synchronous communication network in which nodes can send messages to nodes they know the identifier of and establish new connections by sending node identifiers.
If the initial network's graph is weakly connected and has constant degree, then our algorithm constructs the desired topology with each node sending and receiving only $O(\log n)$ messages in each round in time $O(\log n)$, w.h.p., which beats the currently best $O(\log^{3/2} n)$ time algorithm of [Götte et al., SIROCCO'19].
Since the problem cannot be solved faster than by using pointer jumping for $O(\log n)$ rounds (which would even require each node to communicate $\Omega(n)$ bits), our algorithm is asymptotically optimal.
We achieve this speedup by using short random walks to repeatedly establish random connections between the nodes that quickly reduce the conductance of the graph using an observation of [Kwok and Lau, APPROX'14].
Additionally, we show how our algorithm can be used to efficiently solve graph problems in \emph{hybrid networks} [Augustine et al., SODA'20].
Motivated by the idea that nodes possess two different modes of communication, we assume that communication of the \emph{initial} edges is unrestricted. In contrast, only polylogarithmically many messages can be communicated over edges that have been established throughout an algorithm's execution.
For an (undirected) graph $G$ with arbitrary degree, we show how to compute connected components, a spanning tree, and biconnected components in time $O(\log n)$, w.h.p.
Furthermore, we show how to compute an MIS in time $O(\log d + \log \log n)$, w.h.p., where $d$ is the initial degree of $G$.},
author = {Götte, Thorsten and Hinnenthal, Kristian and Scheideler, Christian and Werthmann, Julian},
booktitle = {Proc. of the 40th ACM Symposium on Principles of Distributed Computing (PODC '21)},
editor = {Censor-Hillel, Keren},
location = {Virtual},
publisher = {ACM},
title = {{Time-Optimal Construction of Overlays}},
doi = {10.1145/3465084.3467932},
year = {2021},
}
@article{16294,
abstract = {Model predictive control is a prominent approach to construct a feedback
control loop for dynamical systems. Due to real-time constraints, the major
challenge in MPC is to solve model-based optimal control problems in a very
short amount of time. For linear-quadratic problems, Bemporad et al. have
proposed an explicit formulation where the underlying optimization problems are
solved a priori in an offline phase. In this article, we present an extension
of this concept in two significant ways. We consider nonlinear problems and -
more importantly - problems with multiple conflicting objective functions. In
the offline phase, we build a library of Pareto optimal solutions from which we
then obtain a valid compromise solution in the online phase according to a
decision maker's preference. Since the standard multi-parametric programming
approach is no longer valid in this situation, we instead use interpolation
between different entries of the library. To reduce the number of problems that
have to be solved in the offline phase, we exploit symmetries in the dynamical
system and the corresponding multiobjective optimal control problem. The
results are verified using two different examples from autonomous driving.},
author = {Ober-Blöbaum, Sina and Peitz, Sebastian},
journal = {International Journal of Robust and Nonlinear Control},
number = {2},
pages = {380--403},
title = {{Explicit multiobjective model predictive control for nonlinear systems with symmetries}},
doi = {10.1002/rnc.5281},
volume = {31},
year = {2021},
}
@article{21065,
abstract = {The machine recognition of speech spoken at a distance from the microphones, known as far-field automatic speech recognition (ASR), has received a significant increase of attention in science and industry, which caused or was caused by an equally significant improvement in recognition accuracy. Meanwhile it has entered the consumer market with digital home assistants with a spoken language interface being its most prominent application. Speech recorded at a distance is affected by various acoustic distortions and, consequently, quite different processing pipelines have emerged compared to ASR for close-talk speech. A signal enhancement front-end for dereverberation, source separation and acoustic beamforming is employed to clean up the speech, and the back-end ASR engine is robustified by multi-condition training and adaptation. We will also describe the so-called end-to-end approach to ASR, which is a new promising architecture that has recently been extended to the far-field scenario. This tutorial article gives an account of the algorithms used to enable accurate speech recognition from a distance, and it will be seen that, although deep learning has a significant share in the technological breakthroughs, a clever combination with traditional signal processing can lead to surprisingly effective solutions.},
author = {Haeb-Umbach, Reinhold and Heymann, Jahn and Drude, Lukas and Watanabe, Shinji and Delcroix, Marc and Nakatani, Tomohiro},
journal = {Proceedings of the IEEE},
number = {2},
pages = {124--148},
title = {{Far-Field Automatic Speech Recognition}},
doi = {10.1109/JPROC.2020.3018668},
volume = {109},
year = {2021},
}
@article{21096,
abstract = {While many research in distributed computing has covered solutions for self-stabilizing computing and topologies, there is far less work on self-stabilization for distributed data structures. However, when peers in peer-to-peer networks crash, a distributed data structure may not remain intact. We present a self-stabilizing protocol for a distributed data structure called the Hashed Patricia Trie (Kniesburges and Scheideler WALCOM'11) that enables efficient prefix search on a set of keys. The data structure has many applications while offering low overhead and efficient operations when embedded on top of a Distributed Hash Table. Especially, longest prefix matching for x can be done in O(log |x|) hash table read accesses. We show how to maintain the structure in a self-stabilizing way, while assuring a low overhead in a legal state and an asymptotically optimal memory demand of O(d) bits, where d is the number of bits needed for storing all keys.},
author = {Knollmann, Till and Scheideler, Christian},
issn = {0890-5401},
journal = {Information and Computation},
title = {{A self-stabilizing Hashed Patricia Trie}},
doi = {10.1016/j.ic.2021.104697},
year = {2021},
}
@misc{21116,
author = {Rennemeier, Steffen},
title = {{Entwicklung und Pilotierung eines Experiments über Visualisierungen von Taxonomien in der Wirtschaftsinformatik}},
year = {2021},
}
@misc{21084,
author = {Werthmann, Julian},
title = {{Derandomization and Local Graph Problems in the Node-Capacitated Clique}},
year = {2021},
}
@misc{21197,
author = {Mengshi, Ma},
title = {{Self-stabilizing Arrow Protocol on Spanning Trees with a Low Diameter}},
year = {2021},
}
@inbook{21293,
abstract = {Of the many outstanding female philosophers of the European Enlightenment, Emilie Du Châtelet excelled as a physicist, a philosopher, and a mathematician, as well as a Bible critic. She was famous in her lifetime and was not completely forgotten thereafter. Among her admirers, correspondents and friends were the most acknowledged scholars of her time, including Voltaire, Clairault, Maupertuis, Diderot, Helvetius, La Mettrie, Buffon, Christian Wolff, Leonard Euler, and Johann II Bernoulli. Her philosophical work enjoyed high reputation and her opus magnum, the Institutions physiques, was translated into Italian and German and proved her to be an intellectual of European stature. Its defense of living forces and its implied forecast into dynamics as well as her methodological grounding of scientific knowledge as hypothetical, impacted philosophy and science. Reality must by nature escape us. What we perceive are phenomena. Du Châtelet explains the function of space and time to trace us back to the origin of phenomena. Her influence on Kant is evident. Next to her writings in physics, mathematics, philosophy, language, and logic, she contributed to morality and ethics. Du Châtelet left an opus of quite systematic breadth. This impressive publishing activity excels in the amount of its scientific and philosophical production to which a vast collection of manuscripts must be added.
She argued against prejudice and idolatry in philosophy and science. Science is a cooperative undertaking over history and beyond nations. Her moral writings align with ideas of the French materialists. Du Châtelet translated and commented on Newton’s Principia, preparing thus the fertile soil of the generation of physicists to come in France.},
author = {Hagengruber, Ruth Edith},
booktitle = {Encyclopedia of Early Modern Philosophy and the Sciences},
isbn = {9783319207919},
title = {{Du Châtelet, Émilie (1706–1749)}},
doi = {10.1007/978-3-319-20791-9_410-1},
year = {2021},
}
@misc{21402,
author = {Sureth-Sloane, Caren and Simons, Dirk},
booktitle = {Frankfurter Allgemeine Zeitung},
number = {Nr. 20},
pages = {16},
title = {{Wie kompliziert darf eine Regel sein?}},
year = {2021},
}
@article{21298,
author = {Mirbabaie, Milad and Stieglitz, S. and Brünker, F.},
journal = {Information Technology & People},
title = {{Dynamics of Convergence Behaviour in Social Media Crisis Communication – A Complexity Perspective on Peoples’ Behaviour}},
year = {2021},
}
@inproceedings{21313,
author = {Bittner, E. and Mirbabaie, Milad and Morana, S.},
booktitle = {54th Hawaii International Conference System Sciences},
title = {{Digital Facilitation Assistance for Collaborative, Creative Design Processes}},
year = {2021},
}
@article{21301,
author = {Mirbabaie, Milad and Stieglitz, S. and Frick, N.R.J. and Möllmann, H.L.},
journal = {Journal of Medical Internet Research Medical Informatics },
title = {{Driving Digital Transformation During a Pandemic: Study of Virtual Collaboration in a German Hospital}},
year = {2021},
}
@inproceedings{20858,
author = {Camberg, Alan Adam and Tröster, Thomas and Wingenbach, Nils and Hielscher, Christian and Grenz, Julian},
location = {Wolfsburg},
publisher = {Springer},
title = {{A new numerical method for potential anaylsis and design of hybrid components from full vehicle simulations: Implementation and component design}},
doi = {https://doi.org/10.1007/978-3-662-62924-6_30},
year = {2021},
}
@unpublished{21572,
author = {Ridderbusch, Steffen and Offen, Christian and Ober-Blöbaum, Sina and Goulart, Paul},
title = {{Learning ODE Models with Qualitative Structure Using Gaussian Processes }},
year = {2021},
}
@inproceedings{21560,
author = {Beule, Felix and Teutenberg, Dominik and Meschut, Gerson and Aubel, Tobias and Matzenmiller, Anton},
booktitle = {21. Kolloquium: Gemeinsame Forschung in der Klebtechnik},
title = {{Methodenentwicklung zur Versagensanalyse aufgrund der Aushärtung vorgeschädigter Klebverbindungen in stahlintensiven Mischbaustrukturen}},
year = {2021},
}
@phdthesis{21596,
author = {Fischer, Andreas},
publisher = {Universität Paderborn},
title = {{Computing on Encrypted Data using Trusted Execution Environments}},
year = {2021},
}
@phdthesis{21630,
abstract = {Eine zustandsbasierte Instandhaltungsstrategie reduziert das Risiko eines Ausfalls eines technischen Systems bei gleichzeitig hoher Ausnutzung und planbaren Instandhaltungsmaßnahmen. Das Ziel dieser Arbeit liegt in der Entwicklung einer Zustandsüberwachung für Gummi-Metall-Elemente. Die Herausforderungen dieser Zustandsüberwachung leiten sich aus dem viskoelastischen Verhalten sowie dem komplexen Degradationsverhalten der Elemente ab. Infolge der daraus resultierenden Unsicherheiten werden die Elemente heutzutage präventiv instandgehalten. In Lebensdauerversuchen der Gummi-Metall-Elemente werden drei Messgrößen detektiert. Dabei wird mit der Temperatur eine Messgröße identifiziert, die am geeignetsten zur Beschreibung des Zustands der Elemente ist. Generell wird die Genauigkeit einer Zustandsüberwachung durch verschiedene Unsicherheiten beeinflusst. Für die Prognose der nutzbaren Restlebensdauer der Gummi-Metall-Elemente wird das Partikelfilter, eine verbreitete modellbasierte Methode zur Zustandsüberwachung technischer Systeme, weiterentwickelt, um Unsicherheiten im Verhalten und der Degradation der Elemente zu berücksichtigen. Anhand der Ergebnisse wird belegt, dass aufbauend auf dieser Zustandsüberwachung die Ausnutzung der Gummi-Metall-Elemente in realen Anwendungen durch eine präventive Instandhaltung erhöht werden kann. Damit bildet diese Arbeit die Basis für zukünftige, prädiktive Instandhaltungskonzepte für diese Elemente. Weiterhin bestätigt die Arbeit, dass eine Berücksichtigung vorliegender Unsicherheiten zu einem frühen Zeitpunkt im Entwicklungsprozess des Zustandsüberwachungssystems empfehlenswert ist.},
author = {Bender, Amelie},
keyword = {Zustandsüberwachung, Prognose der Restlebensdauer, modellbasierte Prognose, Partikelfilter, Unsicherheiten, Gummi, Verlässlichkeit, Lebensdauerversuche, Predictive Maintenance},
title = {{Zustandsüberwachung zur Prognose der Restlebensdauer von Gummi-Metall-Elementen unter Berücksichtigung systembasierter Unsicherheiten}},
doi = {10.17619/UNIPB/1-1084},
year = {2021},
}