TY - CONF
AU - Bengs, Viktor
AU - Hüllermeier, Eyke
ID - 21534
T2 - International Conference on Machine Learning
TI - Preselection Bandits
ER -
TY - GEN
AB - We consider a resource-aware variant of the classical multi-armed bandit
problem: In each round, the learner selects an arm and determines a resource
limit. It then observes a corresponding (random) reward, provided the (random)
amount of consumed resources remains below the limit. Otherwise, the
observation is censored, i.e., no reward is obtained. For this problem setting,
we introduce a measure of regret, which incorporates the actual amount of
allocated resources of each learning round as well as the optimality of
realizable rewards. Thus, to minimize regret, the learner needs to set a
resource limit and choose an arm in such a way that the chance to realize a
high reward within the predefined resource limit is high, while the resource
limit itself should be kept as low as possible. We derive the theoretical lower
bound on the cumulative regret and propose a learning algorithm having a regret
upper bound that matches the lower bound. In a simulation study, we show that
our learning algorithm outperforms straightforward extensions of standard
multi-armed bandit algorithms.
AU - Bengs, Viktor
AU - Hüllermeier, Eyke
ID - 21536
T2 - arXiv:2011.00813
TI - Multi-Armed Bandits with Censored Consumption of Resources
ER -
TY - JOUR
AU - Ortmann, Regina
AU - Pelster, Matthias
AU - Wengerek, Sascha Tobias
ID - 21539
JF - Finance Research Letters
SN - 1544-6123
TI - COVID-19 and investor behavior
ER -
TY - CONF
AB - In this publication, the near-field to far-field transformation using the self-built near-field scanner NFS3000 is examined with regard to its geometry. This device allows to measure electric and magnetic fields in small distances to the DUT (Device under Test) with high geometric precision and high sensitivity. Leading to a fast examination of EMC (Electromagnetic Compatibility) problems, because the electromagnetic properties are better understandable and therefore easier to solve than e.g. measurements in a far-field chamber. In addition, it is possible to extrapolate the near-fields into the far-field and to determine the radiation pattern of antennas and emitting objects. For this purpose, this paper deals with the basis of this transformation, the so-called surface equivalence theorem. This principle is then adapted to the measurement of near-field scanners and implemented accordingly. Due to the non-ideal design of the near-field scanner, the effects on a far-field transformation are finally presented and discussed.
AU - Lange, Sven
AU - Schroder, Dominik
AU - Hedayat, Christian
AU - Hangmann, Christian
AU - Otto, Thomas
AU - Hilleringmann, Ulrich
ID - 21541
KW - Near-Field Scanner
KW - Near-Field to Far-Field Transformation
KW - Directivity
KW - Surface Equivalence Theorem
KW - Huygens’ Box
SN - 2325-0364
T2 - 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE
TI - Investigation of the Surface Equivalence Principle on a Metal Surface for a Near-Field to Far-Field Transformation by the NFS3000
ER -
TY - CHAP
AB - Using near-field (NF) scan data to predict the far-field (FF) behaviour of radiating electronic systems represents a novel method to accompany the whole RF design process. This approach involves so-called Huygens' box as an efficient radiation model inside an electromagnetic (EM) simulation tool and then transforms the scanned NF measured data into the FF. For this, the basic idea of the Huygens'box principle and the NF-to-FF transformation are briefly presented. The NF is measured on the Huygens' box around a device under test using anNF scanner, recording the magnitude and phase of the site-related magnetic and electric components. A comparison between a fullwave simulation and the measurement results shows a good similarity in both the NF and the simulated and transformed FF.Thus, this method is applicable to predict the FF behaviour of any electronic system by measuring the NF. With this knowledge, the RF design can be improved due to allowing a significant reduction of EM compatibility failure at the end of the development flow. In addition, the very efficient FF radiation model can be used for detailed investigations in various environments and the impact of such an equivalent radiation source on other electronic systems can be assessed.
AU - Schröder, Dominik
AU - Lange, Sven
AU - Hangmann, Christian
AU - Hedayat, Christian
ID - 21542
KW - Huygens' box
KW - NF-to-FF transformation
KW - efficient FF radiation model
KW - FF behaviour
KW - EMI assessment
KW - PCB
KW - near-field measurements
KW - efficient radiation model
KW - far-field behaviour
KW - RF design process
KW - far-field prediction
KW - Huygens'box principle
KW - fullwave simulation
KW - electronic system radiation
KW - equivalent radiation source
KW - electromagnetic simulation tool
KW - near-field scan data
KW - EM compatibility failure reduction
SN - 9781839530494
T2 - Tensorial Analysis of Networks (TAN) Modelling for PCB Signal Integrity and EMC Analysis
TI - Far-field prediction combining simulations with near-field measurements for EMI assessment of PCBs
ER -
TY - CHAP
AU - Berger, Thomas
AU - Lanza, Lukas Johannes
ID - 21579
SN - 2199-7497
T2 - Progress in Differential-Algebraic Equations II
TI - Observers for Differential-Algebraic Systems with Lipschitz or Monotone Nonlinearities
ER -
TY - CONF
AU - Gatica, Carlos Paiz
AU - Platzner, Marco
ID - 21584
SN - 2522-8579
T2 - Machine Learning for Cyber Physical Systems (ML4CPS 2017)
TI - Adaptable Realization of Industrial Analytics Functions on Edge-Devices using Reconfigurable Architectures
ER -
TY - JOUR
AU - Meschede, Henning
ID - 21608
JF - Renewable Energy
SN - 0960-1481
TI - Analysis on the demand response potential in hotels with varying probabilistic influencing time-series for the Canary Islands
ER -
TY - JOUR
AU - Graf-Schlattmann, Marcel
AU - Meister, Dorothee M.
AU - Oevel, Gudrun
AU - Wilde, Melanie
ID - 17331
IS - 1
JF - Forschungsperspektiven auf Digitalisierung in Hochschulen, Zeitschrift für Hochschulentwicklung
TI - Kollektive Veränderungsbereitschaft als zentraler Erfolgsfaktor von Digitalisierungsprozessen an Hochschulen
VL - 15
ER -
TY - JOUR
AU - Hampel, Uwe
AU - Schubert, Markus
AU - Döß, Alexander
AU - Sohr, Johanna
AU - Vishwakarma, Vineet
AU - Repke, Jens‐Uwe
AU - Gerke, Sören J.
AU - Leuner, Hannes
AU - Rädle, Matthias
AU - Kapoustina, Viktoria
AU - Schmitt, Lucas
AU - Grünewald, Marcus
AU - Brinkmann, Jost H.
AU - Plate, Dominik
AU - Kenig, Eugeny
AU - Lutters, Nicole
AU - Bolenz, Lukas
AU - Buckmann, Felix
AU - Toye, Dominique
AU - Arlt, Wolfgang
AU - Linder, Thomas
AU - Hoffmann, Rainer
AU - Klein, Harald
AU - Rehfeldt, Sebastian
AU - Winkler, Thomas
AU - Bart, Hans‐Jörg
AU - Wirz, Dominic
AU - Schulz, Jonas
AU - Scholl, Stephan
AU - Augustin, Wolfgang
AU - Jasch, Katharina
AU - Schlüter, Florian
AU - Schwerdtfeger, Natalie
AU - Jahnke, Stefan
AU - Jupke, Andreas
AU - Kabatnik, Christoph
AU - Braeuer, Andreas Siegfried
AU - D'Auria, Mirko
AU - Runowski, Thomas
AU - Casal, Maria Francisco
AU - Becker, Karsten
AU - David, Anna‐Lena
AU - Górak, Andrzej
AU - Skiborowski, Mirko
AU - Groß, Kai
AU - Qammar, Hina
ID - 17335
JF - Chemie Ingenieur Technik
SN - 0009-286X
TI - Recent Advances in Experimental Techniques for Flow and Mass Transfer Analyses in Thermal Separation Systems
VL - 92
ER -
TY - CHAP
AU - Jazayeri, Bahar
AU - Schwichtenberg, Simon
AU - Küster, Jochen
AU - Zimmermann, Olaf
AU - Engels, Gregor
ID - 17337
SN - 0302-9743
T2 - Advanced Information Systems Engineering
TI - Modeling and Analyzing Architectural Diversity of Open Platforms
ER -
TY - CHAP
AB - Peer-to-Peer news portals allow Internet users to write news articles and make them available online to interested readers. Despite the fact that authors are free in their choice of topics, there are a number of quality characteristics that an article must meet before it is published. In addition to meaningful titles, comprehensibly written texts and meaning- ful images, relevant tags are an important criteria for the quality of such news. In this case study, we discuss the challenges and common mistakes that Peer-to-Peer reporters face when tagging news and how incorrect information can be corrected through the orchestration of existing Natu- ral Language Processing services. Lastly, we use this illustrative example to give insight into the challenges of dealing with bottom-up taxonomies.
AU - Bäumer, Frederik Simon
AU - Kersting, Joschka
AU - Buff, Bianca
AU - Geierhos, Michaela
ED - Audrius, Lopata
ED - Rita, Butkienė
ED - Daina, Gudonienė
ED - Vilma, Sukackė
ID - 17347
T2 - Information and Software Technologies
TI - Tag Me If You Can: Insights into the Challenges of Supporting Unrestricted P2P News Tagging
VL - 1283
ER -
TY - CONF
AU - Kucklick, Jan-Peter
AU - Müller, Oliver
ID - 17348
T2 - Symposium on Statistical Challenges in Electronic Commerce Research (SCECR)
TI - Location, location, location: Satellite image-based real-estate appraisal
ER -
TY - GEN
AU - Grabo, Matti
AU - Staggenborg, Christoph
AU - Kenig, Eugeny
ID - 17349
TI - Modellierung und Optimierung makroverkapselter Latentwärmespeicherelemente für ein luftgeführtes Wärmespeichersystem
ER -
TY - CHAP
AU - Moritzer, Elmar
AU - Hüttner, Matthias
AU - Henning, Bernd
AU - Webersen, Manuel
ED - Hopmann, Christian
ED - Dahlmann, Rainer
ID - 17352
SN - 9783662608081
T2 - Advances in Polymer Processing 2020
TI - The Influence of Hydrothermal Aging on the Material Properties of Continuous Fiber-Reinforced Thermoplastics and its Non-Destructive Characterization
ER -
TY - JOUR
AB - Approximate circuits trade-off computational accuracy against improvements in hardware area, delay, or energy consumption. IP core vendors who wish to create such circuits need to convince consumers of the resulting approximation quality. As a solution we propose proof-carrying approximate circuits: The vendor creates an approximate IP core together with a certificate that proves the approximation quality. The proof certificate is bundled with the approximate IP core and sent off to the consumer. The consumer can formally verify the approximation quality of the IP core at a fraction of the typical computational cost for formal verification. In this paper, we first make the case for proof-carrying approximate circuits and then demonstrate the feasibility of the approach by a set of synthesis experiments using an exemplary approximation framework.
AU - Witschen, Linus Matthias
AU - Wiersema, Tobias
AU - Platzner, Marco
ID - 17358
IS - 9
JF - IEEE Transactions On Very Large Scale Integration Systems
KW - Approximate circuit synthesis
KW - approximate computing
KW - error metrics
KW - formal verification
KW - proof-carrying hardware
SN - 1063-8210
TI - Proof-carrying Approximate Circuits
VL - 28
ER -
TY - JOUR
AB - In this article, we focus on the acceleration of a chemical reaction simulation that relies on a system of stiff ordinary differential equation (ODEs) targeting heterogeneous computing systems with CPUs and field-programmable gate arrays (FPGAs). Specifically, we target an essential kernel of the coupled chemistry aerosol-tracer transport model to the Brazilian developments on the regional atmospheric modeling system (CCATT-BRAMS). We focus on a linear solve step using the QR factorization based on the modified Gram-Schmidt method as the basis of the ODE solver in this application. We target Intel hardware accelerator research program (HARP) architecture with the OpenCL programming environment for these early experiments. Our design exploration reveals a hardware design that is up to 4 times faster than the original iterative Jacobi method used in this solver. Still, even with hardware support, the overall performance of our QR-based hardware is lower than its original software version.
AU - Alberto Oliveira de Souza Junior, Carlos
AU - Bispo, João
AU - Cardoso, João M. P.
AU - Diniz, Pedro C.
AU - Marques, Eduardo
ID - 17359
JF - Electronics
KW - pc2-harp-ressources
SN - 2079-9292
TI - Exploration of FPGA-Based Hardware Designs for QR Decomposition for Solving Stiff ODE Numerical Methods Using the HARP Hybrid Architecture
ER -
TY - JOUR
AU - Johansson-Pajala, Rose-Marie
AU - Thommes, Kirsten
AU - Hoppe, Julia Amelie
AU - Tuisku, Outi
AU - Hennala, Lea
AU - Pekkarinen, Satu
AU - Melkas, Helina
AU - Gustafsson, Christine
ID - 17361
JF - International Journal of Social Robotics
TI - Care Robot Orientation: What, Who and How? Potential Users` Perceptions
ER -
TY - JOUR
AU - Hoppe, Julia Amelie
AU - Johansson-Pajala, Rose-Marie
AU - Gustafsson, Christine
AU - Melkas, Helinä
AU - Tusku, Outi
AU - Pekkarinen, Satu
AU - Hennala, Lea
ID - 17366
JF - Industrie 4.0 Management
SN - 2364-9208
TI - Technologieorientierung zu Assistenzrobotik – Welche Akzeptanz besteht bei der Einführung von Assistenzrobotik für die Pflege älterer Menschen?
VL - 2
ER -
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 - CONF
AU - Vorbohle, Christian
AU - Szopinski, Daniel
AU - Kundisch, Dennis
ED - Shishkov, B.
ID - 17368
SN - 978-3-030-52305-3
TI - Business Model Dependencies: Towards conceptualizing dependencies for extending modeling languages for business models
VL - 391
ER -
TY - JOUR
AU - Ho, Nam
AU - Kaufmann, Paul
AU - Platzner, Marco
ID - 17369
JF - International Journal of Hybrid intelligent Systems
TI - Evolution of Application-Specific Cache Mappings
ER -
TY - CONF
AB - We consider a natural extension to the metric uncapacitated Facility Location Problem (FLP) in which requests ask for different commodities out of a finite set \( S \) of commodities.
Ravi and Sinha (SODA 2004) introduced the model as the \emph{Multi-Commodity Facility Location Problem} (MFLP) and considered it an offline optimization problem.
The model itself is similar to the FLP: i.e., requests are located at points of a finite metric space and the task of an algorithm is to construct facilities and assign requests to facilities while minimizing the construction cost and the sum over all assignment distances.
In addition, requests and facilities are heterogeneous; they request or offer multiple commodities out of $S$.
A request has to be connected to a set of facilities jointly offering the commodities demanded by it.
In comparison to the FLP, an algorithm has to decide not only if and where to place facilities, but also which commodities to offer at each.
To the best of our knowledge we are the first to study the problem in its online variant in which requests, their positions and their commodities are not known beforehand but revealed over time.
We present results regarding the competitive ratio.
On the one hand, we show that heterogeneity influences the competitive ratio by developing a lower bound on the competitive ratio for any randomized online algorithm of \( \Omega ( \sqrt{|S|} + \frac{\log n}{\log \log n} ) \) that already holds for simple line metrics.
Here, \( n \) is the number of requests.
On the other side, we establish a deterministic \( \mathcal{O}(\sqrt{|S|} \cdot \log n) \)-competitive algorithm and a randomized \( \mathcal{O}(\sqrt{|S|} \cdot \frac{\log n}{\log \log n} ) \)-competitive algorithm.
Further, we show that when considering a more special class of cost functions for the construction cost of a facility, the competitive ratio decreases given by our deterministic algorithm depending on the function.
AU - Castenow, Jannik
AU - Feldkord, Björn
AU - Knollmann, Till
AU - Malatyali, Manuel
AU - Meyer auf der Heide, Friedhelm
ID - 17370
KW - Online Multi-Commodity Facility Location
KW - Competitive Ratio
KW - Online Optimization
KW - Facility Location Problem
SN - 9781450369350
T2 - Proceedings of the 32nd ACM Symposium on Parallelism in Algorithms and Architectures
TI - The Online Multi-Commodity Facility Location Problem
ER -
TY - CONF
AU - Castenow, Jannik
AU - Kling, Peter
AU - Knollmann, Till
AU - Meyer auf der Heide, Friedhelm
ID - 17371
SN - 9781450369350
T2 - Proceedings of the 32nd ACM Symposium on Parallelism in Algorithms and Architectures
TI - Brief Announcement: A Discrete and Continuous Study of the Max-Chain-Formation Problem: Slow Down to Speed up
ER -
TY - JOUR
AU - Zhou, Jiaqi
AU - Khazaei, Mohammad
AU - Ranjbar, Ahmad
AU - Wang, Vei
AU - Kühne, Thomas D.
AU - Ohno, Kaoru
AU - Kawazoe, Yoshiyuki
AU - Liang, Yunye
ID - 17375
JF - J. Mater. Chem. C
TI - Modulation of nearly free electron states in hydroxyl-functionalized MXenes: a first-principles study
VL - 8
ER -
TY - JOUR
AU - Kumar Sahoo, Sudhir
AU - Heske, Julian Joachim
AU - Azadi, Sam
AU - Zhang, Zhenzhe
AU - V Tarakina, Nadezda
AU - Oschatz, Martin
AU - Z. Khaliullin, Rustam
AU - Antonietti, Markus
AU - Kühne, Thomas
ID - 17379
IS - 1
JF - Scientific Reports
TI - On the Possibility of Helium Adsorption in Nitrogen Doped Graphitic Materials
VL - 10
ER -
TY - JOUR
AU - Elgabarty, Hossam
AU - Kampfrath, Tobias
AU - Bonthuis, Douwe Jan
AU - Balos, Vasileios
AU - Kaliannan, Naveen Kumar
AU - Loche, Philip
AU - Netz, Roland R.
AU - Wolf, Martin
AU - K{\, Thomas D.
AU - Sajadi, Mohsen
ID - 17381
IS - 17
JF - Science Advances
TI - Energy transfer within the hydrogen bonding network of water following resonant terahertz excitation
VL - 6
ER -
TY - JOUR
AU - Rengaraj, Varadarajan
AU - Lass, Michael
AU - Plessl, Christian
AU - Kühne, Thomas D.
ID - 17382
IS - 2
JF - Computation
SN - 2079-3197
TI - Accurate Sampling with Noisy Forces from Approximate Computing
VL - 8
ER -
TY - JOUR
AU - Elgabarty, Hossam
AU - Kühne, Thomas D.
ID - 17384
JF - Phys. Chem. Chem. Phys.
TI - Tumbling with a limp: local asymmetry in water's hydrogen bond network and its consequences
VL - 22
ER -
TY - JOUR
AU - Kühne, Thomas D.
AU - Iannuzzi, Marcella
AU - Del Ben, Mauro
AU - Rybkin, Vladimir V.
AU - Seewald, Patrick
AU - Stein, Frederick
AU - Laino, Teodoro
AU - Khaliullin, Rustam Z.
AU - Schütt, Ole
AU - Schiffmann, Florian
AU - al., et
ID - 17386
IS - 19
JF - The Journal of Chemical Physics
SN - 1089-7690
TI - CP2K: An electronic structure and molecular dynamics software package - Quickstep: Efficient and accurate electronic structure calculations
VL - 152
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 - CONF
AU - Turcanu, Ion
AU - Engel, Thomas
AU - Sommer, Christoph
ID - 17398
SN - 9781728145716
T2 - 2019 IEEE Vehicular Networking Conference (VNC)
TI - Fog Seeding Strategies for Information-Centric Heterogeneous Vehicular Networks
ER -
TY - CONF
AU - Frank, Maximilian
AU - Gausemeier, Juergen
AU - Hennig-Cardinal von Widdern, Nils
AU - Koldewey, Christian
AU - Menzefricke, Joern Steffen
AU - Reinhold, Jannik
ID - 17405
T2 - Proceedings of the ISPIM connects
TI - A reference process for the Smart Service business: development and practical implications
ER -
TY - CONF
AU - Becker, Julia-Kristin
AU - Joachim, Klemens
AU - Koldewey, Christian
AU - Reinhold, Jannik
AU - Dumitrescu, Roman
ID - 17406
T2 - Proceedings of the 2020 ISPIM Innovation Conference (Virtual) Event "Innovating in Times of Crisis"
TI - Scaling Digital Business Models: A Case from the Automotive Industry
ER -
TY - CONF
AU - Tornede, Alexander
AU - Wever, Marcel Dominik
AU - Hüllermeier, Eyke
ID - 17407
T2 - Discovery Science
TI - Extreme Algorithm Selection with Dyadic Feature Representation
ER -
TY - CONF
AU - Hanselle, Jonas Manuel
AU - Tornede, Alexander
AU - Wever, Marcel Dominik
AU - Hüllermeier, Eyke
ID - 17408
T2 - KI 2020: Advances in Artificial Intelligence
TI - Hybrid Ranking and Regression for Algorithm Selection
ER -
TY - CHAP
AB - Many dynamical systems possess symmetries, e.g. rotational and translational invariances of mechanical systems. These can be beneficially exploited in the design of numerical optimal control methods. We present a model predictive control scheme which is based on a library of precomputed motion primitives. The primitives are equivalence classes w.r.t. the symmetry of the optimal control problems. Trim primitives as relative equilibria w.r.t. this symmetry, play a crucial role in the algorithm. The approach is illustrated using an academic mobile robot example.
AU - Flaßkamp, Kathrin
AU - Ober-Blöbaum, Sina
AU - Peitz, Sebastian
ED - Junge, Oliver
ED - Schütze, Oliver
ED - Froyland, Gary
ED - Ober-Blöbaum, Sina
ED - Padberg-Gehle, Kathrin
ID - 17411
SN - 2198-4182
T2 - Advances in Dynamics, Optimization and Computation
TI - Symmetry in Optimal Control: A Multiobjective Model Predictive Control Approach
ER -
TY - CONF
AU - Tornede, Tanja
AU - Tornede, Alexander
AU - Wever, Marcel Dominik
AU - Mohr, Felix
AU - Hüllermeier, Eyke
ID - 17424
T2 - Proceedings of the ECMLPKDD 2020
TI - AutoML for Predictive Maintenance: One Tool to RUL Them All
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 - JOUR
AU - Wang, D. Q.
AU - Reuter, Dirk
AU - Wieck, A. D.
AU - Hamilton, A. R.
AU - Klochan, O.
ID - 17433
JF - Applied Physics Letters
SN - 0003-6951
TI - Two-dimensional lateral surface superlattices in GaAs heterostructures with independent control of carrier density and modulation potential
ER -
TY - JOUR
AU - Kunnathully, Vinay S.
AU - Riedl, Thomas
AU - Trapp, Alexander
AU - Langer, Timo
AU - Reuter, Dirk
AU - Lindner, Jörg K.N.
ID - 17434
JF - Journal of Crystal Growth
SN - 0022-0248
TI - InAs heteroepitaxy on nanopillar-patterned GaAs (111)A
ER -
TY - JOUR
AU - Geier, M.
AU - Freudenfeld, J.
AU - Silva, J. T.
AU - Umansky, V.
AU - Reuter, Dirk
AU - Wieck, A. D.
AU - Brouwer, P. W.
AU - Ludwig, S.
ID - 17435
JF - Physical Review B
SN - 2469-9950
TI - Electrostatic potential shape of gate-defined quantum point contacts
ER -
TY - JOUR
AB - The study of electron transport in low-dimensional systems is of importance, not only from a fundamental point of view, but also for future electronic and spintronic devices. In this context heterostructures containing a two-dimensional electron gas (2DEG) are a key technology. In particular GaAs/AlGaAs heterostructures, with a 2DEG at typically 100 nm below the surface, are widely studied. In order to explore electron transport in such systems, low-resistance ohmic contacts are required that connect the 2DEG to macroscopic measurement leads at the surface. Here we report on designing and measuring a dedicated device for unraveling the various resistance contributions in such contacts, which include pristine 2DEG series resistance, the 2DEG resistance under a contact, the contact resistance itself, and the influence of pressing a bonding wire onto a contact. We also report here a recipe for contacts with very low resistance values that remain below 10 Ω for annealing times between 20 and 350 s, hence providing the flexibility to use this method for materials with different 2DEG depths. The type of heating, temperature ramp rate and gas forming used for annealing is found to strongly influence the annealing process and hence the quality of the resulting contacts.
AU - Javaid Iqbal, Muhammad
AU - Reuter, Dirk
AU - Wieck, Andreas Dirk
AU - van der Wal, Caspar
ID - 17436
JF - The European Physical Journal Applied Physics
SN - 1286-0042
TI - Characterization of low-resistance ohmic contacts to a two-dimensional electron gas in a GaAs/AlGaAs heterostructure
ER -
TY - JOUR
AU - Ebler, C.
AU - Labud, P. A.
AU - Rai, A. K.
AU - Reuter, Dirk
AU - Wieck, A. D.
AU - Ludwig, A.
ID - 17437
JF - Physical Review B
SN - 2469-9950
TI - Electrical detection of excitonic states by time-resolved conductance measurements
ER -
TY - JOUR
AB - Compact and robust cold atom sources are increasingly important for quantum research, especially for transferring cutting-edge quantum science into practical applications. In this study, we report on a novel scheme that uses a metasurface optical chip to replace the conventional bulky optical elements used to produce a cold atomic ensemble with a single incident laser beam, which is split by the metasurface into multiple beams of the desired polarization states. Atom numbers ~107 and temperatures (about 35 μK) of relevance to quantum sensing are achieved in a compact and robust fashion. Our work highlights the substantial progress toward fully integrated cold atom quantum devices by exploiting metasurface optical chips, which may have great potential in quantum sensing, quantum computing, and other areas.
AU - Zhu, Lingxiao
AU - Liu, Xuan
AU - Sain, Basudeb
AU - Wang, Mengyao
AU - Schlickriede, Christian
AU - Tang, Yutao
AU - Deng, Junhong
AU - Li, Kingfai
AU - Yang, Jun
AU - Holynski, Michael
AU - Zhang, Shuang
AU - Zentgraf, Thomas
AU - Bongs, Kai
AU - Lien, Yu-Hung
AU - Li, Guixin
ID - 17523
IS - 31
JF - Science Advances
SN - 2375-2548
TI - A dielectric metasurface optical chip for the generation of cold atoms
VL - 6
ER -
TY - JOUR
AU - Schweizer, Swetlana
AU - Becker-Staines, Anna
AU - Tröster, Thomas
ID - 17578
JF - Waste Management
SN - 0956-053X
TI - Separation and reclamation of automotive hybrid structures made of metal and fibre-reinforced plastic
ER -
TY - JOUR
AU - Sonnenrein, G.
AU - Baumhögger, Elmar
AU - Elsner, A.
AU - Morbach, A.
AU - Neukötter, M.
AU - Paul, A.
AU - Vrabec, J.
ID - 17589
JF - International Journal of Refrigeration
SN - 0140-7007
TI - Improving the performance of household refrigerating appliances through the integration of phase change materials in the context of the new global refrigerator standard IEC 62552:2015
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 - GEN
AB - Employing a unique sample of 2,849 tariff imposition announcements by and against the United States (U.S.) over the period from 2018 to 2019, this study analyzes the impact of recent tariff announcements on share prices from 859 U.S. companies. We provide evidence for negative (cumulative) average abnormal stock returns due to tariff announcements during a symmetric three-day event window. We suggest that stock market investors expect adverse impacts of tariff impositions, e.g. a decrease in the companies' future cash flows and a threat of retaliation. The negative wealth effects are observed irrespective of whether the Trump administration announces safeguard tariffs to protect domestic firms or a retaliation is declared by foreign countries. Moreover, building several subsamples, we find that the adverse impact is mostly driven by announcements involving China and is associated with a variety of sector, tariff, trade and firm characteristics.
AU - Wengerek, Sascha Tobias
ID - 17703
KW - event study
KW - international relations
KW - protectionism
KW - strategic trade policy
KW - tariffs
KW - trade conflict
TI - Share price reactions to tariff imposition announcements in the Trump era - An event study of the trade conflict
ER -
TY - JOUR
AU - Ortmann, Regina
AU - Pelster, Matthias
AU - Wengerek, Sascha Tobias
ID - 17730
JF - Finance Research Letters
SN - 1544-6123
TI - COVID-19 and investor behavior
VL - 37
ER -