@article{BraunKunklerKellner, author = {Braun, Maximilian and Kunkler, Jan and Kellner, Florian}, title = {Towards Sustainable Cities: Utilizing Floating Car Data to Support Location-Based Road Network Performance Measurements}, series = {Sustainability}, volume = {12}, journal = {Sustainability}, number = {19}, publisher = {MDPI}, doi = {10.3390/su12198145}, abstract = {Road network performance (RNP) is a key element for urban sustainability as it has a significant impact on economy, environment, and society. Poor RNP can lead to traffic congestion, which can lead to higher transportation costs, more pollution and health issues regarding the urban population. To evaluate the effects of the RNP, the involved stakeholders need a real-world data base to work with. This paper develops a data collection approach to enable location-based RNP analysis using publicly available traffic information. Therefore, we use reachable range requests implemented by navigation service providers to retrieve travel times, travel speeds, and traffic conditions. To demonstrate the practicability of the proposed methodology, a comparison of four German cities is made, considering the network characteristics with respect to detours, infrastructure, and traffic congestion. The results are combined with cost rates to compare the economical dimension of sustainability of the chosen cities. Our results show that digitization eases the assessment of traffic data and that a combination of several indicators must be considered depending on the relevant sustainability dimension decisions are made from.}, language = {en} } @incollection{KellnerLienlandUtz, author = {Kellner, Florian and Lienland, Bernhard and Utz, Sebastian}, title = {Optimal engine technology mix in a low carbon economy}, series = {2020 International Conference on Decision Aid Sciences and Application (DASA), 08-09 November 2020, Sakheer, Bahrain}, booktitle = {2020 International Conference on Decision Aid Sciences and Application (DASA), 08-09 November 2020, Sakheer, Bahrain}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-7281-9677-0}, doi = {10.1109/DASA51403.2020.9317094}, pages = {95 -- 98}, abstract = {Environmental regulations force automotive companies to modify the powertrain technology portfolio offered to the customer to comply with greenhouse gas (GHG) emission targets. Automotive companies, in turn, are faced with the decision of finding the right powertrain technology portfolio because the selection of a particular technology portfolio affects different company targets at the same time. What makes this decision even more interesting is the fact that future market shares of the different technologies are uncertain. With its numerous objectives, this challenge requires multi-criteria decision-making techniques to identify the optimal powertrain technology portfolio. The objective of this research is to present a new decision support approach for assembling optimal powertrain technology portfolios while making decision-makers aware of the trade-offs between the achievable market share, the market share risk, and the GHG emissions generated by the selected vehicle fleet. The proposed approach combines `a posteriori' decision-making, multi-objective optimization, and the Markowitz portfolio theory. In an application case, the outlooks of selected market studies are fed into the proposed decision support system. The result is a visualization and analysis of the current real-world decision-making problem faced by many automotive companies. Interesting findings of this research include that for the assumed GHG restrictions in place in 2030, there exists no optimal powertrain technology portfolio that is not composed of at least 20\% of electric vehicles.}, language = {en} } @article{ReschkeNeumannBerlitz, author = {Reschke, Johannes and Neumann, Cornelius and Berlitz, Stephan}, title = {Personalised neural networks for a driver intention prediction: communication as enabler for automated driving}, series = {Advanced Optical Technologies}, volume = {9}, journal = {Advanced Optical Technologies}, number = {6}, publisher = {De Gruyter}, doi = {10.1515/aot-2020-0035}, pages = {357 -- 364}, abstract = {In everyday traffic, pedestrians rely on informal communication with other road users. In case of auto� mated vehicles, this communication can be replaced by light signals, which need to be learned beforehand. Prior to an extensive introduction of automated vehicles, a learning phase for these light signals can be set up in manual driving with help of a driver intention prediction. Therefore, a three-staged algorithm consisting of a neural network, a random forest and a conditional stage, is implemented. Using this algorithm, a true-positive rate (TPR) of 94.0\% for a 5.0\% false-positive rate (FPR) can be achieved. To improve this process, a personalization pro� cedure is implemented, using driver-specific behaviours, resulting in TPRs ranging from 91.5 to 96.6\% for a FPR of 5.0\%. Transfer learning of neural networks improves the prediction accuracy of almost all drivers. In order to introduce the implemented algorithm in today's traffic, especially the FPR has to be improved considerably.}, language = {en} } @article{Goertler, author = {G{\"o}rtler, Michael}, title = {Zeit als (knappe) Ressource sozialp{\"a}dagogischen Handelns: Eine empirische Untersuchung zur Bedeutung von Zeit in der sozialp{\"a}dagogische Praxis}, series = {Diskurs Kindheits- und Jugendforschung}, volume = {15}, journal = {Diskurs Kindheits- und Jugendforschung}, number = {1}, publisher = {Verlag Barbara Budrich}, issn = {1862-5002}, doi = {10.3224/diskurs.v15i1.09}, pages = {109 -- 113}, language = {de} } @article{BirkenmaierDorniaLehleetal., author = {Birkenmaier, Clemens and Dornia, Christian and Lehle, Karla and M{\"u}ller, Thomas and Gruber, Michael and Philipp, Alois and Krenkel, Lars}, title = {Analysis of Thrombotic Deposits in Extracorporeal Membrane Oxygenators by High-resolution Microcomputed Tomography: A Feasibility Study}, series = {ASAIO Journal / American Society for Artificial Internal Organs}, volume = {66}, journal = {ASAIO Journal / American Society for Artificial Internal Organs}, number = {8}, publisher = {Lippincott Williams \& Wilkins}, issn = {1538-943X}, doi = {10.1097/MAT.0000000000001089}, pages = {922 -- 928}, abstract = {Coagulative disorders, especially clotting during extracorporeal membrane oxygenation, are frequent complications. Direct visualization and analysis of deposits in membrane oxygenators using computed tomography (CT) may provide an insight into the underlying mechanisms causing thrombotic events. However, the already established multidetector CT1 (MDCT) method shows major limitations. Here, we demonstrate the feasibility of applying industrial micro-CT (μCT) to circumvent these restrictions. Three clinically used membrane oxygenators were investigated applying both MDCT and μCT. The scans were analyzed in terms of clot volume and local clot distribution. As validation, the clot volume was also determined from the fluid volume, which could be filled into the respective used oxygenator compared to a new device. In addition, cross-sectional CT images were compared with crosscut oxygenators. Based on the μCT findings, a morphological measure (sphericity) for assessing clot structures in membrane oxygenators is introduced. Furthermore, by comparing MDCT and μCT results, an augmentation of the MDCT method is proposed, which allows for improved clot volume determination in a clinical setting.}, language = {en} } @inproceedings{SchiedermeierRettnerSteineretal., author = {Schiedermeier, Maximilian and Rettner, Cornelius and Steiner, Marcel and M{\"a}rz, Martin}, title = {Dual-inverter control synchronization strategy to minimize the DC-link capacitor current}, series = {2020 IEEE Vehicle Power and Propulsion Conference (VPPC), 18 November 2020 - 16 December 2020, Gijon, Spain}, booktitle = {2020 IEEE Vehicle Power and Propulsion Conference (VPPC), 18 November 2020 - 16 December 2020, Gijon, Spain}, publisher = {IEEE}, doi = {10.1109/VPPC49601.2020.9330921}, pages = {1 -- 6}, abstract = {This paper proposes the possible switching synchronization strategies of an automotive dual-inverter against the background of minimizing the RMS DC-link capacitor current. The publication mainly focuses on the straight-ahead motion of a rear axle with one electric drive per wheel. In addition to it, a dual-inverter consisting of two subinverters with a common DC-link capacitor is taken into consideration. These sub-inverters each have three phases and are based on a 2-level voltage-source-topology. To control the electrical machines, the continuous Space-Vector-Modulation strategy is used. For this application, different control signal synchronization strategies of the two sub-inverters of the dualinverter are presented. Apart from the existing strategies, this paper proposes a new method, which inherits a compromise between low complexity and high effectiveness. In contrast to previous publications, the resulting capacitor currents are quantified and subsequentlyevaluated. This novel quantification, which is dependent on the dual-inverter's operating point, provides a base for targeted dimensioning of the capacitor. Moreover, this forms the foundation for further investigations of vehicle's cornering, as well as for the possible synchronization of stand-alone inverters. In the context of this publication, the presented results are verified by experimentally determined data of a motor-inverter system.}, language = {en} } @article{WeinTomeGoldhackeretal., author = {Wein, Simon and Tom{\´e}, Ana Maria and Goldhacker, Markus and Greenlee, Mark W. and Lang, Elmar Wolfgang}, title = {A Constrained ICA-EMD Model for Group Level fMRI Analysis}, series = {Frontiers in Neuroscience}, volume = {14}, journal = {Frontiers in Neuroscience}, publisher = {frontiers}, issn = {1662-453X}, doi = {10.3389/fnins.2020.00221}, pages = {1 -- 10}, abstract = {Independent component analysis (ICA), being a data-driven method, has been shown to be a powerful tool for functional magnetic resonance imaging (fMRI) data analysis. One drawback of this multivariate approach is that it is not, in general, compatible with the analysis of group data. Various techniques have been proposed to overcome this limitation of ICA. In this paper, a novel ICA-based workflow for extracting resting-state networks from fMRI group studies is proposed. An empirical mode decomposition (EMD) is used, in a data-driven manner, to generate reference signals that can be incorporated into a constrained version of ICA (cICA), thereby eliminating the inherent ambiguities of ICA. The results of the proposed workflow are then compared to those obtained by a widely used group ICA approach for fMRI analysis. In this study, we demonstrate that intrinsic modes, extracted by EMD, are suitable to serve as references for cICA. This approach yields typical resting-state patterns that are consistent over subjects. By introducing these reference signals into the ICA, our processing pipeline yields comparable activity patterns across subjects in a mathematically transparent manner. Our approach provides a user-friendly tool to adjust the trade-off between a high similarity across subjects and preserving individual subject features of the independent components.}, language = {en} } @article{VonGreveDierfeldLothenbachVollprachtetal., author = {Von Greve-Dierfeld, Stefanie and Lothenbach, Barbara and Vollpracht, Anya and Wu, Bei and Huet, Bruno and Andrade, Carmen and Medina, C{\´e}sar and Thiel, Charlotte and Gruyaert, Elke and Vanoutrive, Hanne and Del Sa{\´e}z Bosque, Isabel F. and Ignjatovic, Ivan and Elsen, Jan and Provis, John L. and Scrivener, Karen and Thienel, Karl-Christian and Sideris, Kosmas and Zajac, Maciej and Alderete, Natalia and Cizer, {\"O}zlem and Van den Heede, Philip and Hooton, Robert Douglas and Kamali-Bernard, Siham and Bernal, Susan A. and Zhao, Zengfeng and Shi, Zhenguo and De Belie, Nele}, title = {Understanding the carbonation of concrete with supplementary cementitious materials}, series = {Materials and Structures}, volume = {53}, journal = {Materials and Structures}, publisher = {Springer Nature}, doi = {10.1617/s11527-020-01558-w}, pages = {1 -- 34}, abstract = {Blended cements, where Portland cement clinker is partially replaced by supplementary cementitious materials (SCMs), provide the most feasible route for reducing carbon dioxide emissions associated with concrete production. However, lowering the clinker content can lead to an increasing risk of neutralisation of the concrete pore solution and potential reinforcement corrosion due to carbonation. carbonation of concrete with SCMs differs from carbonation of concrete solely based on Portland cement (PC). This is a consequence of the differences in the hydrate phase assemblage and pore solution chemistry, as well as the pore structure and transport properties, when varying the binder composition, age and curing conditions of the concretes. The carbonation mechanism and kinetics also depend on the saturation degree of the concrete and CO2 partial pressure which in turn depends on exposure conditions (e.g. relative humidity, volume, and duration of water in contact with the concrete surface and temperature conditions). This in turn influence the microstructural changes identified upon carbonation. This literature review, prepared by members of RILEM technical committee 281-CCC carbonation of concrete with supplementary cementitious materials, working groups 1 and 2, elucidates the effect of numerous SCM characteristics, exposure environments and curing conditions on the carbonation mechanism, kinetics and structural alterations in cementitious systems containing SCMs.}, language = {en} } @misc{EbigboMendelTziatziosetal., author = {Ebigbo, Alanna and Mendel, Robert and Tziatzios, Georgios and Probst, Andreas and Palm, Christoph and Messmann, Helmut}, title = {Real-Time Diagnosis of an Early Barrett's Carcinoma using Artificial Intelligence (AI) - Video Case Demonstration}, series = {Endoscopy}, volume = {52}, journal = {Endoscopy}, number = {S 01}, publisher = {Thieme}, doi = {10.1055/s-0040-1704075}, pages = {S23}, abstract = {Introduction We present a clinical case showing the real-time detection, characterization and delineation of an early Barrett's cancer using AI. Patients and methods A 70-year old patient with a long-segment Barrett's esophagus (C5M7) was assessed with an AI algorithm. Results The AI system detected a 10 mm focal lesion and AI characterization predicted cancer with a probability of >90\%. After ESD resection, histopathology showed mucosal adenocarcinoma (T1a (m), R0) confirming AI diagnosis. Conclusion We demonstrate the real-time AI detection, characterization and delineation of a small and early mucosal Barrett's cancer.}, subject = {Speiser{\"o}hrenkrebs}, language = {en} } @inproceedings{HopfenspergerDaubnerHerrmannetal., author = {Hopfensperger, Bernhard and Daubner, Andreas and Herrmann, Fabian and Hopkins, Andrew and Mellor, Phil}, title = {Investigation of Shifted PWM Methods for a Dual Three-Phase System to Reduce Capacitor RMS Current}, series = {PCIM Europe Digital Days 2020: International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management: 07.-08.07.2020, Online [proceedings]}, booktitle = {PCIM Europe Digital Days 2020: International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management: 07.-08.07.2020, Online [proceedings]}, publisher = {VDE-Verlag}, address = {Berlin, Offenbach}, isbn = {978-3-8007-5245-4}, pages = {124 -- 131}, abstract = {Mild hybrid automotive topologies containing a 48V high power (>15 kW) electric drive system demand a high integration of power electronics and electrical machine. A multi-phase motor winding topology helps to keep the per-phase operating currents to a reasonable level. Close integration and multi-phase system have led to a drive system with dual 3-phase systems supplied by a common 48V DC-link, which allows to shift PWM patterns for reduction of DC-link capacitor ripple current and size. This paper derives some basic rules for combinations of common PWM methods for dual 3-phase systems without magnetic cross-coupling. Experimental measurements verify simulated results.}, subject = {Elektroantrieb}, language = {en} } @misc{OPUS4-3577, title = {Angewandte Forschung in der Wirtschaftsinformatik 2020 : Tagungsband zur 33. AKWI-Jahrestagung am 14.09.2020 ausgerichtet von der Hochschule Karlsruhe - Wirtschaft und Technik}, editor = {Nees, Franz and Stengel, Ingo and Meister, Vera G. and Barton, Thomas and Herrmann, Frank and M{\"u}ller, Christian and Wolf, Martin R.}, publisher = {mana-Buch}, address = {Heide}, isbn = {978-3-944330-66-2}, doi = {10.15771/978-3-944330-66-2}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-13840}, pages = {147}, language = {de} } @article{SchulzSchwarz, author = {Schulz, Carsten and Schwarz, Colin}, title = {Drivetrain fatigue strength characteristics of model-predictive control for wind turbines}, series = {Wind Energy}, volume = {23}, journal = {Wind Energy}, number = {12}, publisher = {Wiley}, doi = {10.1002/we.2520}, pages = {2137 -- 2149}, abstract = {Wind turbines play a crucial role in the revolution towards renewable resources. They need to be economically competitive to be sustainable. This still requires to lower the cost of energy (COE). To this end, nonlinear model predictive control (NMPC) is used within this paper. As known from literature, NMPC significantly improves the energy extracting performance as well as the mitigation of tower loads of wind turbines. As it is shown in this paper, the drivetrain fatigue strength drops disproportionally in parallel, which either increases the demands on the turbine design or decreases the lifetime of drivetrain components. Without additional boundary conditions to the underlying optimal control problems (OCPs), the application of energy-maximizing NMPC might so even raise the COE. Only penalizing axial torque oscillations by quadratic terms decreases energy-extracting performance below the level of classical wind turbine controllers. This makes more sophisticated conditions necessary. In this paper, the increase of the drivetrain damage by NMPC is analyzed, and appropriate boundary conditions are derived, to balance the two contradicting objectives of energy maximization and drivetrain load mitigation. An NMPC approach based on indirect methods is used, to obtain a solution of the OCPs very efficiently. It applies the Hamilton equations and Pontryagin's maximum principle. Its accuracy and efficiency to solve OCPs was presented over the last decades.}, language = {en} } @misc{Sterner, author = {Sterner, Michael}, title = {Megathema Wasserstoff: Power-to-X im Kontext der Energiewende und des Klimaschutzes in Deutschland}, series = {IRES Symposium, Berlin 18.11.2020}, journal = {IRES Symposium, Berlin 18.11.2020}, language = {de} } @misc{Mauerer, author = {Mauerer, Wolfgang}, title = {Open Source in Research and Reality}, series = {Open Source Summit North America and Embedded Linux Conference North America 2020}, journal = {Open Source Summit North America and Embedded Linux Conference North America 2020}, language = {en} } @misc{Sterner, author = {Sterner, Michael}, title = {Power-to-Gas technologies in the energy sector and their role in the fight against climate change}, series = {Hungarian Power-to-Gas REKK Forum, Budapest Corvinus University, 12.02.2020}, journal = {Hungarian Power-to-Gas REKK Forum, Budapest Corvinus University, 12.02.2020}, language = {en} } @article{YuanGeisslerShaoetal., author = {Yuan, Jing and Geissler, Christian and Shao, Weijia and Lommatzsch, Andreas and Jain, Brijnesh}, title = {When algorithm selection meets Bi-linear Learning to Rank: accuracy and inference time trade off with candidates expansion}, series = {International Journal of Data Science and Analytics}, journal = {International Journal of Data Science and Analytics}, publisher = {Springer Nature}, doi = {10.1007/s41060-020-00229-x}, pages = {17}, abstract = {Algorithm selection (AS) tasks are dedicated to find the optimal algorithm for an unseen problem instance. With the knowledge of problem instances' meta-features and algorithms' landmark performances, Machine Learning (ML) approaches are applied to solve AS problems. However, the standard training process of benchmark ML approaches in AS either needs to train the models specifically for every algorithm or relies on the sparse one-hot encoding as the algorithms' representation. To escape these intermediate steps and form the mapping function directly, we borrow the learning to rank framework from Recommender System (RS) and embed the bi-linear factorization to model the algorithms' performances in AS. This Bi-linear Learning to Rank (BLR) has proven to work with competence in some AS scenarios and thus is also proposed as a benchmark approach. Thinking from the evaluation perspective in the modern AS challenges, precisely predicting the performance is usually the measuring goal. Though approaches' inference time also needs to be counted for the running time cost calculation, it's always overlooked in the evaluation process. The multi-objective evaluation metric Adjusted Ratio of Root Ratios (A3R) is therefore advocated in this paper to balance the trade-off between the accuracy and inference time in AS. Concerning A3R, BLR outperforms other benchmarks when expanding the candidates range to TOP3. The better effect of this candidates expansion results from the cumulative optimum performance during the AS process. We take the further step in the experimentation to represent the advantage of such TOPK expansion, and illustrate that such expansion can be considered as the supplement for the convention of TOP1 selection during the evaluation process.}, language = {en} } @article{FroeseJainNiedermeieretal., author = {Froese, Vincent and Jain, Brijnesh and Niedermeier, Rolf and Renken, Malte}, title = {Comparing temporal graphs using dynamic time warping}, series = {Social Network Analysis and Mining}, volume = {10}, journal = {Social Network Analysis and Mining}, publisher = {Springer Nature}, doi = {10.1007/s13278-020-00664-5}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-38493}, pages = {1 -- 16}, abstract = {Within many real-world networks, the links between pairs of nodes change over time. Thus, there has been a recent boom in studying temporal graphs. Recognizing patterns in temporal graphs requires a proximity measure to compare different temporal graphs. To this end, we propose to study dynamic time warping on temporal graphs. We define the dynamic tem- poral graph warping (dtgw) distance to determine the dissimilarity of two temporal graphs. Our novel measure is flexible and can be applied in various application domains. We show that computing the dtgw-distance is a challenging (in general) NP-hard optimization problem and identify some polynomial-time solvable special cases. Moreover, we develop a quadratic programming formulation and an efficient heuristic. In experiments on real-world data, we show that the heuristic performs very well and that our dtgw-distance performs favorably in de-anonymizing networks compared to other approaches.}, language = {en} } @misc{Mauerer, author = {Mauerer, Wolfgang}, title = {Safety, Security, Quality: Artificial Intelligence versus Common Sense}, series = {Open Source Summit North America and Embedded Linux Conference North America 2020}, journal = {Open Source Summit North America and Embedded Linux Conference North America 2020}, language = {en} } @article{SaxFeldZielinskietal., author = {Sax, Irmi and Feld, Sebastian and Zielinski, Sebastian and Gabor, Thomas and Linnhoff-Popien, Claudia and Mauerer, Wolfgang}, title = {Towards Understanding Approximation Complexity on a Quantum Annealer}, series = {Digitale Welt}, volume = {4}, journal = {Digitale Welt}, number = {1}, publisher = {DIGITALE WELT Academy c/o Ludwig-Maximilians-Universit{\"a}t M{\"u}nchen}, address = {M{\"u}nchen}, doi = {10.1007/s42354-019-0244-1}, pages = {104}, abstract = {Many industrially relevant problems can be deterministically solved by computers in principle, but are intractable in practice, as the seminal P/NP dichotomy of complexity theory and Cobham's thesis testify. For the many NP-complete problems, industry needs to resort to using heuristics or approximation algorithms. For approximation algorithms, there is a more refined classification in complexity classes that goes beyond the simple P/NP dichotomy. As it is well known, approximation classes form a hierarchy, that is, FPTAS \subseteq PTAS \subseteq APX \subseteq NPO. This classification gives a more realistic notion of complexity but—unless unexpected breakthroughs happen for fundamental problems like P = NP or related questions— there is no known efficient algorithm that can solve such problems exactly on a realistic computer. Therefore, new ways of computations are sought. Recently, considerable hope was placed on the possible computational powers of quantum computers and quantum annealing (QA) in particular. However, the precise benefits of such a drastic shift in hardware are still unchartered territory to a good extent. Firstly, the exact relations between classical and quantum complexity classes pose many open questions, and secondly, technical details of formulating and implementing quantum algorithms play a crucial role in real-world applications. Guided by the hierarchy of classical optimisation complexity classes, we discuss how to map problems of each class to a quantum annealer. Those problems are the Minimum Multiprocessor Scheduling (MMS) problem, the Minimum Vertex Cover (MVC) problem and the Maximum Independent Set (MIS) problem. We experimentally investigate if and how the degree of approximability influences implementation and run-time performance. Our experiments indicate a discrepancy between classical approximation complexity and QA behaviour: Problems MIS and MVC, members of APX respectively PTAS, exhibit better solution quality on a QA than MMS, which is in FPTAS, even despite the use of preprocessing the for latter. This leads to the hypothesis that traditional classifications do not immediately extend to the quantum annealing domain, at least when the properties of real-world devices are taken into account. A structural reason, why FPTAS problems do not show good solution quality, might be the use of an inequlity in the problem description of the FPTAS problems. Formulating those inequalities on a quantum hardware (mostly done by formulating a Quadratic Unconstrained Binary optimisation (QUBO) problem in form of a matrix) requires a lot of hardware space which makes finding an optimal solution more difficult. Reducing the density of a QUBO is possible by appropriately pruning QUBO matrices. For the problems considered in our evaluation, we find that the achievable solution quality on a real-world machine is unexpectedly robust against pruning, often up to ratios as high as 50\% or more. Since quantum annealers are probabilistic machines by design, the loss in solution quality is only of subordinate relevance, especially considering that the pruning of QUBO matrices allows for solving larger problem instances on hardware of a given capacity. We quantitatively discuss the interplay between these factors.}, language = {en} } @article{Jain, author = {Jain, Brijnesh}, title = {Sufficient conditions for the existence of a sample mean of time series under dynamic time warping}, series = {Annals of Mathematics and Artificial Intelligence}, volume = {88}, journal = {Annals of Mathematics and Artificial Intelligence}, publisher = {Springer Nature}, doi = {10.1007/s10472-019-09682-2}, pages = {313 -- 346}, abstract = {Time series averaging is an important subroutine for several time series data mining tasks. The most successful approaches formulate the problem of time series averaging as an optimization problem based on the dynamic time warping (DTW) distance. The existence of an optimal solution, called sample mean, is an open problem for more than four decades. Its existence is a necessary prerequisite to formulate exact algorithms, to derive complexity results, and to study statistical consistency. In this article, we propose sufficient conditions for the existence of a sample mean. A key result for deriving the proposed sufficient conditions is the Reduction Theorem that provides an upper bound for the minimum length of a sample mean.}, language = {en} } @inproceedings{RamsauerKiszkaMauerer, author = {Ramsauer, Ralf and Kiszka, Jan and Mauerer, Wolfgang}, title = {A Novel Software Architecture for Mixed Criticality Systems}, series = {Digital Transformation in Semiconductor Manufacturing: Proceedings of the 1st and 2nd European Advances in Digital Transformation Conference, EADTC 2018, Zittau, Germany and EADTC 2019, Milan, Italy}, booktitle = {Digital Transformation in Semiconductor Manufacturing: Proceedings of the 1st and 2nd European Advances in Digital Transformation Conference, EADTC 2018, Zittau, Germany and EADTC 2019, Milan, Italy}, editor = {Keil, Sophia and Lasch, Rainer and Lindner, Fabian and Lohmer, Jacob}, publisher = {Springer International Publishing}, address = {Cham}, doi = {10.1007/978-3-030-48602-0_11}, pages = {121 -- 128}, abstract = {The advent of multi-core CPUs in nearly all embedded markets has prompted an architectural trend towards combining safety critical and uncritical software on single hardware units. We present a novel architecture for mixed criticality systems based on Linux that allows us to consolidate critical and uncritical parts onto a single hardware unit. CPU virtualisation extensions enable strict and static partitioning of hardware by direct assignment of resources, which allows us to boot additional operating systems or bare metal applications running aside Linux. The hypervisor Jailhouse is at the core of the architecture and ensures that the resulting domains may serve workloads of different criticality and can not interfere in an unintended way. This retains Linux's feature-richness in uncritical parts, while frugal safety and real-time critical applications execute in isolated domains. Architectural simplicity is a central aspect of our approach and a precondition for reliable implementability and successful certification. While standard virtualisation extensions provided by current hardware seem to suffice for a straight forward implementation of our approach, there are a number of further limitations that need to be worked around. This paper discusses the arising issues, and evaluates the suitability of our approach for real-world safety and real-time critical scenarios.}, language = {en} } @article{HuLinnerTrummeretal., author = {Hu, Rongbo and Linner, Thomas and Trummer, Julian and G{\"u}ttler, J{\"o}rg and Kabouteh, Amir and Langosch, Katharina and Bock, Thomas}, title = {Developing a Smart Home Solution Based on Personalized Intelligent Interior Units to Promote Activity and Customized Healthcare for Aging Society}, series = {Journal of Population Ageing: Special Issue on responsive engagement of older persons promoting activity and customized healthcare}, volume = {13}, journal = {Journal of Population Ageing: Special Issue on responsive engagement of older persons promoting activity and customized healthcare}, number = {1}, publisher = {Springer Nature}, doi = {10.1007/s12062-020-09267-6}, pages = {257 -- 280}, abstract = {The world's population is aging at an unprecedented pace. Aging society is not only a severe crisis in the developed world, but also a rigorous challenge in emerging economies. Many age-related diseases are fostered by the lack of physical, cognitive, and social activities. Increasing the activity level has many benefits for the elderly and can improve their independence. Based on the analysis of the state-of-the-art and shortcomings of the current smart home solutions, the EU-funded research project REACH aims to develop a service system that will turn clinical and care environments into personalized modular sensing, prevention, and intervention systems that encourage the elderly to become healthy through various activities. To achieve that goal, the research team developed a series of smart furniture (PI2Us) that materialize the research concepts and functionality seamlessly into the various environments. Specifically, the development process and the functionality testing results of the PI2Us are reported in detail. In addition, a simulated smart home solution concept (TRACK) integrating key assistive technologies developed is proposed to create a comprehensive interior living and care environment for elderly users. Due to its modularity and flexibility, the partial or entire solution can be easily adapted and rapidly deployed in different use case settings in Europe, which allows the project consortium to execute different testing activities. In the next phase, the research team will focus on enhancing the usability and performance of the prototypes in order to eventually push them to the market. In conclusion, this research provides an innovative smart home solution for the industry to mitigate the impact of aging society.}, language = {en} } @article{IturraldeLinnerBock, author = {Iturralde, Kepa and Linner, Thomas and Bock, Thomas}, title = {Matching kit interface for building refurbishment processes with 2D modules}, series = {Automation in Construction}, volume = {110}, journal = {Automation in Construction}, number = {February}, publisher = {Elsevier}, doi = {10.1016/j.autcon.2019.103003}, abstract = {A need exists for faster installation of prefabricated modules in the refurbishment market. Current solutions for installing and fitting prefabricated modules on existing buildings are time consuming. The objective of this research is to reduce the time currently required for the installation of timber-based 2D modules by using innovative technologies while improving placement accuracy. A novel installation concept was proposed based on a digitally produced matching kit interface that corrects existing building's irregularities and connector placement deviations. This solution was tested, validated, and compared in several manufacturing contexts. The tests recorded measurable variables such as the manufacturing time and placement accuracy of the modules. The results demonstrate decreases up to 73\% in installation time and placement deviations of less than 2 mm.}, language = {en} } @article{PanLinnerPanetal., author = {Pan, Mi and Linner, Thomas and Pan, Wei and Cheng, Huimin and Bock, Thomas}, title = {Structuring the context for construction robot development through integrated scenario approach}, series = {Automation in Construction}, volume = {114}, journal = {Automation in Construction}, number = {June}, publisher = {Elsevier}, doi = {10.1016/j.autcon.2020.103174}, abstract = {The technological development of construction robots is underway globally. However, current development activities face significant uncertainties, particularly in terms of the definition and management of system requirements, which are primarily based on vague assumptions about the future. Thus, a new tool is required to grasp how construction robots—and their surrounding ecosystems—will be used. This research adopts an unprecedented scenario-based approach to develop and analyze future alternatives for construction robotics in a systematic manner. Hong Kong "toward 2035" is used as an initial test case, and four scenarios of the robot ecosystem, i.e., "Bottleneck," "Age of Iron Worker," "Dynamic Co-evolution of Robotization and Modularization," and "Rise of the Robots," are developed from evidence-based analysis. Scenarios highlight the crucial role of workers for construction robot utilization. Driving forces, opportunities, and challenges are identified for elaborating strategies under each scenario. The integrated scenario approach and findings lay an important foundation for systems engineering processes in construction robotics to develop a new tool for structuring system context and specifying system requirements.}, language = {en} } @inproceedings{HuLinnerSchmailzletal., author = {Hu, Rongbo and Linner, Thomas and Schmailzl, Marc and G{\"u}ttler, J{\"o}rg and Lu, Yuan and Bock, Thomas}, title = {Exploring Gerontechnology for Aging-Related Diseases in Design Education: An Interdisciplinary Perspective}, series = {Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC 2020): From Demonstration to Practical Use, To New Stage of Construction Robot, October 27-28, 2020, Kitakyushu, Japan}, booktitle = {Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC 2020): From Demonstration to Practical Use, To New Stage of Construction Robot, October 27-28, 2020, Kitakyushu, Japan}, editor = {Tateyama, Kazuyoshi and Ishii, Kazuo and Inoue, Fumihiro}, publisher = {The International Association for Automation and Robotics in Construction (I.A.A.R.C.)}, isbn = {978-952-94-3634-7}, doi = {10.22260/ISARC2020/0102}, pages = {735 -- 742}, abstract = {Aging society is not only a crisis in the developed world but also a severe challenge in some emerging economies. However, the awareness of population aging and gerontechnology is far from sufficiently addressed in the architectural design education in universities. Therefore, an interdisciplinary approach in design education is urgently needed to raise the awareness of the aging crisis among the future architects, interior designers, and beyond. This article introduces a novel model of a design seminar offered by a German University, addressing population aging issues in the architecture department. The syllabus, formality, and the expected results of the seminar are revealed in detail. The participants are encouraged to apply interdisciplinary knowledge such as barrier-free architecture, mechanical engineering, electrical engineering, robotics, medicine, psychology, and business to achieve the goals of the seminar. Based on the originality and degree of completion, several students' works are selected and reported, targeting a variety of diseases or syndromes related to aging, such as dementia, immobility, and tremors. Overall, participants of this seminar are motivated and have positive feedback on this seminar, oftentimes claiming that they have seldom studied similar topics in previous architecture education. This enables students from architecture as well as other fields to be better prepared to tackle the upcoming challenges such as labor shortages and infectious diseases in a rapidly aging world. Furthermore, the seminar creates novel concepts that serve as a win-win "honeypot" for both students and their instructors, potentially sparking research topics and start-ups with concepts fostered in this seminar.}, language = {en} } @inproceedings{IturraldeFeuchtHuetal., author = {Iturralde, Kepa and Feucht, Malte and Hu, Rongbo and Pan, Wen and Schlandt, Marcel and Linner, Thomas and Bock, Thomas and Izard, Jean-Baptizste and Eskudero, Ibon and Rodriguez, Mariola and Gorrotxategi, Jose and Astudillo, Julen and Cavalcanti Santos, Jo{\~a}o. and Gouttefarde, Marc and Fabritius, Marc and Martin, Christoph and Henninge, Tomas and Stein, M. Nornes and Normes, Stein M. and Jacobsen, Yngve and Pracucci, Alessandro and Ca{\~n}ada, Jesus and Jimenez-Vicaria, Jose David and Paulotto, Carlo and Alonso, Rub{\´e}n and Elia, Lorenzo}, title = {A Cable Driven Parallel Robot with a Modular End Effector for the Installation of Curtain Wall Modules (Best Paper Award)}, series = {Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC 2020): From Demonstration to Practical Use, To New Stage of Construction Robot, October 27-28, 2020, Kitakyushu, Japan}, booktitle = {Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC 2020): From Demonstration to Practical Use, To New Stage of Construction Robot, October 27-28, 2020, Kitakyushu, Japan}, editor = {Tateyama, Kazuyoshi and Ishii, Kazuo and Inoue, Fumihiro}, publisher = {The International Association for Automation and Robotics in Construction (I.A.A.R.C.)}, isbn = {978-952-94-3634-7}, doi = {10.22260/ISARC2020/0204}, pages = {1472 -- 1479}, abstract = {The installation of curtain wall modules (CWMs) is a risky activity carried out in the heights and often under unfavorable weather conditions. CWMs are heavy prefabricated walls that are lifted normally with bindings and cranes. High stability is needed while positioning in order not to damage the fragile CWMs. Moreover, this activity requires high precision while positioning brackets, the modules, and for that reason, intensive survey and marking are necessary. In order to avoid such inconveniences, there were experiences to install fa{\c{c}}ade modules in automatic mode using robotic devices. In the research project HEPHAESTUS, a novel system has been developed in order to install CWMs automatically. The system consists of two subsystems: a cable driven parallel robot (CDPR) and a set of robotic tools named as Modular End Effector (MEE). The platform of the CDPR hosts the MEE. This MEE performs the necessary tasks of installing the curtain wall modules. There are two main tasks that the CDPR and MEE need to achieve: first is the fixation of the brackets onto the concrete slab, and second is the picking and placing of the CWMs onto the brackets. The first integration of the aforementioned system was carried out in a controlled environment that resembled a building structure. The results of this first test show that there are minor deviations when positioning the CDPR platform. In future steps, the deviations will be compensated by the tools of the MEE and the installation of the CWM will be carried out with the required accuracy automatically.}, language = {en} } @inproceedings{BulgakovBockOttoetal., author = {Bulgakov, Alexey and Bock, Thomas and Otto, Jens and Buzalo, Natalia and Linner, Thomas}, title = {Requirements for Safe Operation and Facility Maintenance of Construction Robots}, series = {Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC 2020): From Demonstration to Practical Use, To New Stage of Construction Robot, October 27-28, 2020, Kitakyushu, Japan}, booktitle = {Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC 2020): From Demonstration to Practical Use, To New Stage of Construction Robot, October 27-28, 2020, Kitakyushu, Japan}, editor = {Tateyama, Kazuyoshi and Ishii, Kazuo and Inoue, Fumihiro}, publisher = {The International Association for Automation and Robotics in Construction (I.A.A.R.C.)}, isbn = {978-952-94-3634-7}, doi = {10.22260/ISARC2020/0053}, pages = {369 -- 376}, abstract = {Construction robots are devices of increased danger and, under certain conditions, can become a source of injuries to maintenance personnel, as well as lead to the failure of technological equipment. Most of the accidents are associated with the presence of maintenance personnel in the working area during programming, configuration, training, repair and maintenance of robots. The article describes measures to ensure safety during the maintenance of robots and manipulators. The stages of preparing the construction industry for the use of manipulators, robots and robotic complexes are presented. A system of measures for preparing equipment for use and its maintenance during operation is proposed.}, language = {en} } @article{PanLinnerPanetal., author = {Pan, Mi and Linner, Thomas and Pan, Wei and Cheng, Huimin and Bock, Thomas}, title = {Influencing factors of the future utilisation of construction robots for buildings: A Hong Kong perspective}, series = {Journal of Building Engineering}, volume = {30}, journal = {Journal of Building Engineering}, number = {July}, publisher = {Elsevier}, doi = {10.1016/j.jobe.2020.101220}, abstract = {Construction robots are expected to have disruptive impacts on the building industry, but 8 there is still a lack of utilisation. While significant attention has been paid to technical 9 advancement, little has been done to comprehensively understand the broader societal issues 10 associated with the use of this technology. This paper aims to provide a holistic exploration 11 of the influencing factors of the future utilisation of construction robots in a systems manner, 12 analyse the interactions among these factors and identify the key ones that are most 13 influential in shaping the technological transformation. A modified fuzzy decision-making 14 trial and evaluation laboratory (DEMATEL) method is developed and applied. Hong Kong 15 was selected as the desirable case for the study due to its vibrant yet challenging built 16 environments. Factors were first systematically identified and synthesised before being 17 empirically verified, evaluated and analysed through the modified fuzzy DEMATEL. The 18 results demonstrate the multi-faceted and complexly interrelated factors influencing the 19 utilisation of construction robots. Eleven influencing factors were determined as critical for 20 shaping the future trajectory of robotic applications, among which "construction cost", 21 "governmental support" and "the scale of prefabrication" are the most influential ones. The 22 findings indicate that more interdisciplinary efforts and broader non-technical discussions are 23 needed to achieve the successful transition of the industry towards robotic construction. The 24 findings further reveal the driving forces of environmental pressures behind the future 25 utilisation of construction robots. Detailed utilisation scenarios which fit to the evolution of 26 the whole society are recommended for future research.}, language = {en} } @inproceedings{PanIturraldeHuetal., author = {Pan, Wen and Iturralde, Kepa and Hu, Rongbo and Linner, Thomas and Bock, Thomas}, title = {Adopting Off-site Manufacturing, and Automation and Robotics Technologies in Energy-efficient Building}, series = {Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC 2020): From Demonstration to Practical Use, To New Stage of Construction Robot, Kitakyushu, Japan, October 27-28, 2020}, booktitle = {Proceedings of the 37th International Symposium on Automation and Robotics in Construction (ISARC 2020): From Demonstration to Practical Use, To New Stage of Construction Robot, Kitakyushu, Japan, October 27-28, 2020}, editor = {Tateyama, Kazuyoshi and Ishii, Kazuo and Inoue, Fumihiro}, publisher = {The International Association for Automation and Robotics in Construction (I.A.A.R.C.)}, isbn = {978-952-94-3634-7}, doi = {10.22260/ISARC2020/0215}, pages = {1549 -- 1555}, abstract = {Delivering energy-efficient buildings or settlements has become a popular topic amongst architects, engineers, and building engineering physicists. There are many methods for improving building energy performances, both for new build projects and for retrofitting existing buildings. However, the construction industry faces some profound challenges to satisfy the increasing demand for energy-efficient buildings or other solutions and to be able to offer them at an affordable cost. A holistic approach has been adopted to validate whether automation robotics and off-site manufacturing technologies can yield positive changes in the delivery of energy-efficient buildings. This paper emphasizes the potential transformations and possible impacts on the design, construction, and installation process of an energy-efficient building once the advanced technologies are implemented. This paper also highlights case studies in multiple ongoing or past European Union (EU) Horizon 2020 research projects as well as private projects to demonstrate the applicability and technical feasibility of the proposed solution. The scenario proposed was used to demonstrate how to apply the proposal in a large-scale residential building project. In addition, the findings from this study will serve as proof of the concept of a larger research project, or as an inspiration for the construction industry to execute energy-efficient building projects in the future.}, language = {en} } @article{LinnerSeelingerVogtLydiaetal., author = {Linner, Thomas and Seelinger, Anja and Vogt Lydia, and Sch{\"a}pers Barbara, and Steinb{\"o}ck, Martina and Krewer, Carmen and Bock, Thomas}, title = {REACH: Solutions for Technology-Based Prevention and Empowerment for Older People and their Caregivers}, series = {Journal of Population Ageing: Special Issue on responsive engagement of older persons promoting activity and customized healthcare}, volume = {13}, journal = {Journal of Population Ageing: Special Issue on responsive engagement of older persons promoting activity and customized healthcare}, number = {1}, publisher = {Springer Nature}, doi = {10.1007/s12062-020-09268-5}, pages = {131 -- 137}, abstract = {REACH stands for "Responsive Engagement of the Elderly Promoting Activity and Customized Healthcare". Sustained physical activity matters greatly to the health and well-being of older people and significantly improves their chance of maintaining independent living. It can make a difference across the whole care continuum as well as in almost every setting. Therefore, REACH solutions focus on the systematic, target-oriented increase of physical activity of older people, and tackle the whole prevention spectrum (primary, secondary, and tertiary). It seeks to empower older people and their formal and informal caregivers, and works towards viable solutions for both the formal and in-formal care sector. Technology-based personalization of prevention, activation, and care services provided in various living and care settings is at the center of the developed solutions. Ideally toolkit approach would allow for the tailoring of solutions that create value for end-users, care providers and health care payers alike through the combination, integration and adaptation/re-design elements towards the different contexts of different countries, different payment and reimbursement structures. This Special Issue sheds light on such solutions, their conception, their development, and their testing.}, language = {en} } @article{GegenfurtnerBoucheixGruberetal., author = {Gegenfurtner, Andreas and Boucheix, Jean-Michel and Gruber, Hans and Hauser, Florian and Lehtinen, Erno and Lowe, Richard K.}, title = {The gaze relational index as a measure of visual expertise}, series = {Journal of Expertise}, volume = {3}, journal = {Journal of Expertise}, number = {March}, publisher = {Michigan State University}, issn = {2573-2773}, pages = {32 -- 40}, abstract = {Eye tracking is a powerful technique that helps reveal how people process visual information. This paper discusses a novel metric for indicating expertise in visual information processing. Named the Gaze Relational Index (GRI), this metric is defined as the ratio of mean fixation duration to fixation count. Data from two eye-tracking studies of professional vision and visual expertise in using 3D dynamic medical visualizations are presented as cases to illustrate the suitability and additional benefits of the GRI. Calculated values of the GRI were higher for novices than for experts, and higher in non-representative, semi-familiar / unfamiliar task conditions than in domain-representative familiar tasks. These differences in GRI suggest that, compared to novices, experts engaged in more knowledge-driven, top-down processing that was characterized by quick, exploratory visual search. We discuss future research aiming to replicate the GRI in professional domains with complex visual stimuli and to identify the moderating role of cognitive ability on GRI estimates.}, language = {en} } @article{SchrollDeckerKnoedler, author = {Schroll-Decker, Irmgard and Kn{\"o}dler, Christoph}, title = {Ausl{\"a}ndische Haushalts- und Betreuungskr{\"a}fte im Einsatz zur h{\"a}uslichen Versorgung: Was der Entlastung dienen soll, wird durch das Recht oft belastet}, series = {Zeitschrift f{\"u}r Sozialp{\"a}dagogik - ZfSp}, volume = {18}, journal = {Zeitschrift f{\"u}r Sozialp{\"a}dagogik - ZfSp}, number = {3}, publisher = {Beltz}, issn = {1610-2339}, pages = {322 -- 337}, abstract = {Das Arrangement von Hilfen im Privathaushalt eines Menschen, der auf Pflege und Betreuung angewiesen ist, besteht h{\"a}ufig aus dem Zusammenwirken von hauptpflegeverantwortlichen Angeh{\"o}rigen, ausl{\"a}ndischen sog. Live-Ins und weiteren professionell oder informell erbrachten sozialen Dienstleistungen. Auf l{\"a}ngere Zeit eine (zun{\"a}chst) unbekannte Arbeitnehmerin im privaten Haushalt mit einer emotional und k{\"o}rperlich sehr intimen Aufgabe zu betrauen, ist nicht nur in fachlicher, sondern auch in zwischenmenschlicher Hinsicht mit besonderen Herausforderungen verbunden. Unter anderem scheint diese soziale N{\"a}he ein Grund daf{\"u}r zu sein, dass die rechtlich relevanten „harten" Bedingungen einerseits beiseitegeschoben und andererseits die Ausgestaltung solcher Modelle h{\"a}uslicher Versorgung sehr bedeutsam und in der Folge von gravierender Belastung sind.}, language = {de} } @misc{OPUS4-3579, title = {SIMUL 2020 : The Twelfth International Conference on Advances in System Simulation : October 18-22, 2020 (SoftNet Congress)}, editor = {Herrmann, Frank and Parra, Lorena and Popescu, Manuela}, publisher = {International Academy, Research, and Industry Association}, address = {Wilmington, DE, USA}, isbn = {9781612088310}, language = {en} } @inproceedings{SilberbauerLindnerSchreiner, author = {Silberbauer, Theodor and Lindner, Matthias and Schreiner, Rupert}, title = {Charakterisierung der dielektrischen Barrierenentladung von Mikroplasmaaktuatoren in Abh{\"a}ngigkeit der Substratdicke}, series = {Intelligente Systeme und ihre Komponenten: Forschung und industrielle Anwendung : Fachbeitr{\"a}ge 2. Symposium Elektronik und Systemintegration ESI 2020}, booktitle = {Intelligente Systeme und ihre Komponenten: Forschung und industrielle Anwendung : Fachbeitr{\"a}ge 2. Symposium Elektronik und Systemintegration ESI 2020}, address = {Landshut}, pages = {64 -- 72}, language = {de} } @inproceedings{BaumannMeyerSickendiek, author = {Baumann, Timo and Meyer-Sickendiek, Burkhard}, title = {Deep Learning meets Post-modern Poetry}, series = {TwinTalks 2020: Understanding and Facilitating Collaboration in Digital Humanities 2020, proceedings of the Twin Talks 2 and 3 workshops at DHN 2020 and DH 2020, Ottawa Canada and Riga Latvia, July 23 and October 20, 2020}, booktitle = {TwinTalks 2020: Understanding and Facilitating Collaboration in Digital Humanities 2020, proceedings of the Twin Talks 2 and 3 workshops at DHN 2020 and DH 2020, Ottawa Canada and Riga Latvia, July 23 and October 20, 2020}, editor = {Krauwer, Steven and Fišer, Darja}, publisher = {RWTH Aachen}, issn = {1613-0073}, pages = {30 -- 36}, abstract = {We summarize our project Rhythmicalizer in which we analyze a corpus of post-modern poetry in a combination of qualitative hermeneutical and computational methods, as we have run the project over the course of the past three years (and preparing it for some time before that). Interdisciplinary work is always challenging and we here focus on some of the highlights of our collaboration.}, language = {en} } @inproceedings{HusseinMeyerSickendiekBaumann, author = {Hussein, Hussein and Meyer-Sickendiek, Burkhard and Baumann, Timo}, title = {Free Verse and Beyond: How to Classify Post-modern Spoken Poetry}, series = {Proceedings of Speech Prosody: Tokyo, Japan, 25-28 May 2020}, booktitle = {Proceedings of Speech Prosody: Tokyo, Japan, 25-28 May 2020}, publisher = {ISCA}, doi = {10.21437/SpeechProsody.2020-141}, pages = {690 -- 694}, abstract = {This paper presents the classification of rhythmical patterns detected in post-modern spoken poetry by means of machine learning algorithms that use manually engineered features or automatically learnt representations. We used the world's largest corpus of spoken poetry from our partner lyrikline. We identified nine rhythmical patterns within a spectrum raging from a more fluent to a more disfluent poetic style. The text data analyzed by a statistical parser. Prosodic features of rhythmical patterns are identified by using the parser information. For the classification of rhythmical patterns, we used a neural networks-based approach which use text, audio, and pause information between poetic lines as features. Different combinations of features as well as the integration of feature engineering in the neural networks-based approach are tested. We compared the performance of both approaches (feature-based and neural network-based) using combinations of different features. The results show - by using the weighted average of f-measure for the evaluation - that the neural networks-based approach performed much better in classification of rhythmical patterns. The important improvement of the classification results lies in the use of the audio information. The integration of feature engineering in the neural networks-based approach yielded a very small result improvement.}, language = {en} } @inproceedings{JohannssenBiemannRemusetal., author = {Johannßen, Dirk and Biemann, Chris and Remus, Steffen and Baumann, Timo and Scheffer, David}, title = {GermEval 2020 Task 1 on the Classification and Regression of Cognitive and Motivational style from Text}, series = {Proceedings of the 5th SwissText \& 16th KONVENS Joint Conference 2020}, booktitle = {Proceedings of the 5th SwissText \& 16th KONVENS Joint Conference 2020}, address = {Zurich, Switzerland}, pages = {1 -- 10}, abstract = {This paper describes the tasks, databases, baseline systems, and summarizes submissions and results for the GermEval 2020 Shared Task 1 on the Classification and Regression of Cognitive and Motivational Style from Text. This shared task is divided into two subtasks, a regression task, and a classification task. Subtask 1 asks participants to reproduce a ranking of students based on average aptitude indicators such as different high school grades and different IQ scores. The second subtask aims to classify so-called implicit motives, which are projective testing procedures that can reveal unconscious desires. Besides five implicit motives, the target labels of Subtask 2 also contain one of six levels that describe the type of self-regulation when acting out a motive, which makes this task a multiclass-classification with 30 target labels. 3 participants submitted multiple systems. Subtask 1 was solved (best r = .3701) mainly with non-neural systems and statistical language representations, submissions for Subtask 2 utilized neural approaches and word embeddings (best macro F1 = 70.40). Not only were the tasks solvable, analyses by the participants even showed connections to the implicit psychometrics theory and behavioral observations made by psychologists. This paper describes the tasks, databases, baseline systems, and summarizes submissions and results for the GermEval 2020 Shared Task 1 on the Classification and Regression of Cognitive and Motivational Style from Text. This shared task is divided into two subtasks, a regression task, and a classification task. Subtask 1 asks participants to reproduce a ranking of students based on average aptitude indicators such as different high school grades and different IQ scores. The second subtask aims to classify so-called implicit motives, which are projective testing procedures that can reveal unconscious desires. Besides five implicit motives, the target labels of Subtask 2 also contain one of six levels that describe the type of self-regulation when acting out a motive, which makes this task a multiclass-classification with 30 target labels. 3 participants submitted multiple systems. Subtask 1 was solved (best r =.3701) mainly with non-neural systems and statistical language representations, submissions for Subtask 2 utilized neural approaches and word embeddings (best macro F1 = 70.40). Not only were the tasks solvable, analyses by the participants even showed connections to the implicit psychometrics theory and behavioral observations made by psychologists.}, language = {en} } @inproceedings{Baumann, author = {Baumann, Timo}, title = {How a Listener Influences the Speaker}, series = {Proceedings of Speech Prosody: Tokyo, Japan, 25-28 May 2020}, booktitle = {Proceedings of Speech Prosody: Tokyo, Japan, 25-28 May 2020}, publisher = {ISCA}, doi = {10.21437/SpeechProsody.2020-198}, pages = {970 -- 974}, abstract = {Listeners typically provide feedback while listening to a speaker in conversation and thereby engage in the co-construction of the interaction. We analyze the influence of the listener on the speaker by investigating how her verbal feedback signals help in modeling the speaker's language. We find that feedback from the listener may help in modeling the speaker's language, whether through the listener's feedback as transcribed, or the acoustic signal directly. We find the largest positive effects for end of sentence as well as for pauses mid-utterance, but also effects that indicate we successfully model elaborations of ongoing utterances that may result from the presence or absence of listener feedback.}, language = {en} } @inproceedings{MuehlbauerRablRottengruber, author = {M{\"u}hlbauer, Christian and Rabl, Hans-Peter and Rottengruber, Hermann}, title = {Development of a Methodology for Acoustic Analysis and Optimization of Mechatronic Fuel Injection Systems}, series = {Automotive Acoustics Conference 2019: Proceedings, 5. Internationale ATZ-Fachtagung Fahrzeugakustik}, booktitle = {Automotive Acoustics Conference 2019: Proceedings, 5. Internationale ATZ-Fachtagung Fahrzeugakustik}, editor = {Siebenpfeiffer, Wolfgang}, publisher = {Springer Vieweg}, address = {Wiesbaden}, isbn = {978-3-658-27668-3}, doi = {10.1007/978-3-658-27669-0_15}, pages = {211 -- 225}, abstract = {To identify the sound quality of fuel injection systems as a frontloading measure, a system test bench has been developed that simulates the structure and airborne noise emission. The setup of the system test bench includes an assembly of the acoustical relevant engine parts and an encapsulated drive for the high-pressure pump. A specific control unit enables a high variability for the operation strategy of the injection system. The focus of this study is on the development of a methodology to analyze and optimize the sound quality of gasoline direct injectors in critical operation points by suitable active means. For this, the injection parameters in engine idle have been identified and subsequently transferred to the system test bench. Additionally, the injection parameters have been optimized acoustically and the impacts on the key functions regarding injection rating and shot-to-shot scattering of the injected fuel mass are discussed.}, language = {en} } @inproceedings{MauererScherzinger, author = {Mauerer, Wolfgang and Scherzinger, Stefanie}, title = {Educating Future Software Architects in the Art and Science of Analysing Software Data.}, series = {SEUH 2020: Software Engineering im Unterricht der Hochschulen, Tagungsband des 17. Workshops "Software Engineering im Unterricht der Hochschulen", Innsbruck, {\"O}sterreich, 26. - 27.02.2020}, booktitle = {SEUH 2020: Software Engineering im Unterricht der Hochschulen, Tagungsband des 17. Workshops "Software Engineering im Unterricht der Hochschulen", Innsbruck, {\"O}sterreich, 26. - 27.02.2020}, editor = {Krusche, Stephan and Wagner, Stefan}, publisher = {RWTH Aachen}, pages = {56 -- 60}, abstract = {We report the design and teaching experience of a Master-level seminar course on quantitative and empirical software engineering. The course combines elements of traditional literature seminars with active learning by scientific project work, in particular quantitative mixed-method analyses of open source systems. It also provides short introductions and refreshers to data mining and statistical analysis, and discusses the nature and practice of scientific knowledge inference. Student presentations of published research, augmented by summary reports, bridge to standard seminars. We discuss our educational goals and the course structure derived from them. We review research questions addressed by students in mini research reports, and analyse them as tokens on how junior-level software engineers perceive the potential of empirical software engineering research. We assess challenges faced, and discuss possible solutions.}, language = {en} } @inproceedings{KruegerMauerer, author = {Kr{\"u}ger, Tom and Mauerer, Wolfgang}, title = {Quantum Annealing-Based Software Components}, series = {Proceedings of the IEEE/ACM 42nd International Conference on Software Engineering Workshops (ICSE'20): Seoul Republic of Korea 27.06.2020 - 19.07.2020}, booktitle = {Proceedings of the IEEE/ACM 42nd International Conference on Software Engineering Workshops (ICSE'20): Seoul Republic of Korea 27.06.2020 - 19.07.2020}, publisher = {Association for Computing Machinery}, address = {New York, NY}, isbn = {9781450379632}, doi = {10.1145/3387940.3391472}, pages = {445 -- 450}, abstract = {Quantum computers have the potential of solving problems more efficiently than classical computers. While first commercial prototypes have become available, the performance of such machines in practical application is still subject to exploration. Quantum computers will not entirely replace classical machines, but serve as accelerators for specific problems. This necessitates integrating quantum computational primitives into existing applications. In this paper, we perform a case study on how to augment existing software with quantum computational primitives for the Boolean satisfiability problem (SAT) implemented using a quantum annealer (QA). We discuss relevant quality measures for quantum components, and show that mathematically equivalent, but structurally different ways of transforming SAT to a QA can lead to substantial differences regarding these qualities. We argue that engineers need to be aware that (and which) details, although they may be less relevant in traditional software engineering, require considerable attention in quantum computing.}, language = {en} } @inproceedings{BrainingerMauererScherzinger, author = {Braininger, Dimitri and Mauerer, Wolfgang and Scherzinger, Stefanie}, title = {Replicability and Reproducibility of a Schema Evolution Study in Embedded Databases}, series = {Advances in conceptual modeling: ER 2020 Workshops CMAI, CMLS, CMOMM4FAIR, CoMoNoS, EmpER, Vienna, Austria, November 3-6, 2020, Proceedings}, volume = {12584}, booktitle = {Advances in conceptual modeling: ER 2020 Workshops CMAI, CMLS, CMOMM4FAIR, CoMoNoS, EmpER, Vienna, Austria, November 3-6, 2020, Proceedings}, editor = {Grossmann, Georg and Ram, Sudha}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-65846-5}, doi = {10.1007/978-3-030-65847-2_19}, pages = {210 -- 219}, abstract = {Ascertaining the feasibility of independent falsification or repetition of published results is vital to the scientific process, and replication or reproduction experiments are routinely performed in many disciplines. Unfortunately, such studies are only scarcely available in database research, with few papers dedicated to re-evaluating published results. In this paper, we conduct a case study on replicating and reproducing a study on schema evolution in embedded databases. We can exactly repeat the outcome for one out of four database applications studied, and come close in two further cases. By reporting results, efforts, and obstacles encountered, we hope to increase appreciation for the substantial efforts required to ensure reproducibility. By discussing minutiae details required to ascertain reproducible work, we argue that such important, but often ignored aspects of scientific work should receive more credit in the evaluation of future research.}, language = {en} } @inproceedings{SaxFeldZielinskietal., author = {Sax, Irmi and Feld, Sebastian and Zielinski, Sebastian and Gabor, Thomas and Linnhoff-Popien, Claudia and Mauerer, Wolfgang}, title = {Approximate approximation on a quantum annealer}, series = {Proceedings of the 17th ACM International Conference on Computing Frontiers (CF '20): Catania Sicily Italy 11.05.2020 -13.05.2020}, booktitle = {Proceedings of the 17th ACM International Conference on Computing Frontiers (CF '20): Catania Sicily Italy 11.05.2020 -13.05.2020}, editor = {Palesi, Maurizio}, publisher = {Association for Computing Machinery}, address = {New York, NY, United States}, isbn = {9781450379564}, doi = {10.1145/3387902.3392635}, pages = {108 -- 117}, abstract = {Many problems of industrial interest are NP-complete, and quickly exhaust resources of computational devices with increasing input sizes. Quantum annealers (QA) are physical devices that aim at this class of problems by exploiting quantum mechanical properties of nature. However, they compete with efficient heuristics and probabilistic or randomised algorithms on classical machines that allow for finding approximate solutions to large NP-complete problems. While first implementations of QA have become commercially available, their practical benefits are far from fully explored. To the best of our knowledge, approximation techniques have not yet received substantial attention. In this paper, we explore how problems' approximate versions of varying degree can be systematically constructed for quantum annealer programs, and how this influences result quality or the handling of larger problem instances on given set of qubits. We illustrate various approximation techniques on both, simulations and real QA hardware, on different seminal problems, and interpret the results to contribute towards a better understanding of the real-world power and limitations of current-state and future quantum computing.}, language = {en} } @article{BrockKoderRabletal., author = {Brock, Damian and Koder, Alexander and Rabl, Hans-Peter and Touraud, Didier and Kunz, Werner}, title = {Optimising the biodiesel production process: Implementation of glycerol derivatives into biofuel formulations and their potential to form hydrofuels}, series = {Fuel}, volume = {264}, journal = {Fuel}, number = {March}, publisher = {Elsevier}, doi = {10.1016/j.fuel.2019.116695}, abstract = {A new biofuel concept is developed, enabling the usage of vegetable oils and glycerol derivatives in mixtures with biodiesel. This concept significantly enhances the biodiesel production's profitability and thus strongly contributes to the sustainability of future biofuels. After simple addition reactions with building block chemicals, less hydrophilic glycerol derivatives are obtained, which are compatible with biofuels. Even more, the products of the reactions of glycerol with acetone or butyric acid, referred to as solketal and tributyrin, respectively, lead to promising biofuels in mixtures with rapeseed oil and its biodiesel. Due to their low freezing points, they act as cloud and freezing point depressants, when added to vegetable oil/biodiesel blends. Further, since their viscosity is close to common biodiesel, biofuels containing high amounts of vegetable oil and even more glycerol derivatives than they arise during the biodiesel production can be obtained. Thus, this new class of biofuels enables adaptable compositions depending on the application and also the usage as drop-in fuel without any or just few percent of further additives. After optimising the formulations, ignition delay, exhaust gas recirculation, fuel consumption and combustion process measurements were performed in an unmodified upto-date diesel engine. The experiments showed that the properties of the formulated biofuels are either similar to or even better than diesel. The hydrotropy of the glycerol derivatives in these mixtures enables the potential to implement water into biofuels, so-called hydrofuels, reducing nitrogen oxide emissions and leading to further optimised dropin fuels.}, language = {en} } @article{LerchNeidhartBubeniceketal., author = {Lerch, Maximilian and Neidhart, Thomas and Bubenicek, Michal and Pandrea, Paul}, title = {Ableitung der Tragf{\"a}higkeit aus Probebelastungen an Betonstopfs{\"a}ulen}, series = {geotechnik}, volume = {43}, journal = {geotechnik}, number = {4}, publisher = {Ernst \& Sohn}, doi = {10.1002/gete.202000030}, pages = {298 -- 306}, abstract = {Neben den konventionellen Pfahlgr{\"u}ndungen werden bei ung{\"u}nstigen Baugrundverh{\"a}ltnissen oft pfahlartige Tragglieder verwendet, um den Anforderungen an Gebrauchstauglichkeit und Standsicherheit bei der Gr{\"u}ndung von Bauwerken gerecht zu werden. Um Erkenntnisse {\"u}ber das Tragverhalten der S{\"a}ulen zu erlangen, wurden Probebelastungen durchgef{\"u}hrt. Hierbei kamen statische und dynamische Probebelastungen zum Einsatz. Die Tragglieder wurden mit faseroptischer Messtechnik ausgestattet, um eine getrennte Ermittlung der Mantel- und Spitzenwiderst{\"a}nde zu erm{\"o}glichen. Die aus den Messungen gewonnenen Erkenntnisse zum Lastabtragungsverhalten zeigen, dass die pfahlartigen Tragglieder aufgrund ihrer Herstellung h{\"o}here Gesamt- und insbesondere Mantelwiderst{\"a}nde als Schneckenortbetonpf{\"a}hle, die als Referenz mit gleichem Durchmesser und gleicher Einbindel{\"a}nge in identischen Baugrundverh{\"a}ltnissen gefertigt wurden, aufweisen. Es wird gezeigt, dass praxis{\"u}bliche Bemessungsverfahren das gemessene Last-Setzungs-Verhalten nur bedingt wiedergeben. Die Versuchsergebnisse stellen die Grundlage f{\"u}r zuk{\"u}nftige Anpassungen der Bemessungsverfahren f{\"u}r pfahlartige Tragglieder dar.}, language = {de} } @inproceedings{BaumannSiegert, author = {Baumann, Timo and Siegert, Ingo}, title = {Prosodic addressee-detection : ensuring privacy in always-on spoken dialog systems}, series = {Tagungsband Mensch und Computer (MuC'20): 06.09.2020 - 09.09.2020, Magdeburg}, booktitle = {Tagungsband Mensch und Computer (MuC'20): 06.09.2020 - 09.09.2020, Magdeburg}, editor = {Alt, Florian and Schneegass, Stefan and Hornecker, Eva}, publisher = {Association for Computing Machinery}, address = {New York, NY, United States}, isbn = {9781450375405}, doi = {10.1145/3404983.3410021}, pages = {195 -- 198}, abstract = {We analyze the addressee detection task for complexity-identical dialog for both human conversation and device-directed speech. Our recurrent neural model performs at least as good as humans, who have problems with this task, even native speakers, who profit from the relevant linguistic skills. We perform ablation experiments on the features used by our model and show that fundamental frequency variation is the single most relevant feature class. Therefore, we conclude that future systems can detect whether they are addressed based only on speech prosody which does not (or only to a very limited extent) reveal the content of conversations not intended for the system.}, language = {en} } @misc{Baumann, author = {Baumann, Timo}, title = {Ubiquity of Computing and SLIVAR}, series = {Spoken Language Interaction with Virtual Agents and Robots (SLIVAR): Towards Effective and Ethical Interaction}, volume = {10}, journal = {Spoken Language Interaction with Virtual Agents and Robots (SLIVAR): Towards Effective and Ethical Interaction}, editor = {Devillers, Laurence and Kawahara, Tatsuya and Moore, Roger K. and Scheutz, Matthias}, publisher = {Schloss Dagstuhl - Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, doi = {10.4230/DagRep.10.1.1}, url = {http://nbn-resolving.de/urn:nbn:de:0030-drops-124009}, pages = {16}, language = {en} } @inproceedings{NayakBaumannBhattacharyaetal., author = {Nayak, Shravan and Baumann, Timo and Bhattacharya, Supratik and Karakanta, Alina and Negri, Matteo and Turchi, Marco}, title = {See me Speaking? Differentiating on Whether Words are Spoken On Screen or Off to Optimize Machine Dubbing}, series = {ICMI '20 Companion: Companion Publication of the 2020 International Conference on Multimodal Interaction, 25.10.2020 - 29.10.2020; Virtual Event Netherlands}, booktitle = {ICMI '20 Companion: Companion Publication of the 2020 International Conference on Multimodal Interaction, 25.10.2020 - 29.10.2020; Virtual Event Netherlands}, editor = {Truong, Khiet}, publisher = {Association for Computing Machinery}, address = {New York,NY,United States}, isbn = {9781450380027}, doi = {10.1145/3395035.3425640}, pages = {130 -- 134}, abstract = {Dubbing is the art of finding a translation from a source into a target language that can be lip-synchronously revoiced, i. e., that makes the target language speech appear as if it was spoken by the very actors all along. Lip synchrony is essential for the full-fledged reception of foreign audiovisual media, such as movies and series, as violated constraints of synchrony between video (lips) and audio (speech) lead to cognitive dissonance and reduce the perceptual quality. Of course, synchrony constraints only apply to the translation when the speaker's lips are visible on screen. Therefore, deciding whether to apply synchrony constraints requires an automatic method for detecting whether an actor's lips are visible on screen for a given stretch of speech or not. In this paper, we attempt, for the first time, to classify on- from off-screen speech based on a corpus of real-world television material that has been annotated word-by-word for the visibility of talking lips on screen. We present classification experiments in which we classify}, language = {en} } @inproceedings{KarakantaBhattacharyaNayaketal., author = {Karakanta, Alina and Bhattacharya, Supratik and Nayak, Shravan and Baumann, Timo and Negri, Matteo and Turchi, Marco}, title = {The Two Shades of Dubbing in Neural Machine Translation}, series = {Proceedings of the 28th International Conference on Computational Linguistics (COLING 2020): Barcelona, Spain (Online)}, booktitle = {Proceedings of the 28th International Conference on Computational Linguistics (COLING 2020): Barcelona, Spain (Online)}, editor = {Scott, Donia and Bel, Nuria and Zong, Chengqing}, publisher = {International Committee on Computational Linguistics}, address = {Stroudsburg, PA, USA}, doi = {10.18653/v1/2020.coling-main.382}, pages = {4327 -- 4333}, abstract = {Dubbing has two shades; synchronisation constraints are applied only when the actor's mouth is visible on screen, while the translation is unconstrained for off-screen dubbing. Consequently, different synchronisation requirements, and therefore translation strategies, are applied depending on the type of dubbing. In this work, we manually annotate an existing dubbing corpus (Heroes) for this dichotomy. We show that, even though we did not observe distinctive features between on- and off-screen dubbing at the textual level, on-screen dubbing is more difficult for MT (-4 BLEU points). Moreover, synchronisation constraints dramatically decrease translation quality for off-screen dubbing. We conclude that, distinguishing between on-screen and off-screen dubbing is necessary for determining successful strategies for dubbing-customised Machine Translation.}, language = {en} } @incollection{Herrmann, author = {Herrmann, Frank}, title = {Generic Scheduling by an optimization model demonstrated for a partly automated production line}, series = {Recent Advances in Science and Technology Research Vol. 7}, booktitle = {Recent Advances in Science and Technology Research Vol. 7}, editor = {Makul, Natt}, publisher = {Book Publisher International (a part of SCIENCEDOMAIN International)}, isbn = {978-93-90431-52-6}, pages = {13 -- 27}, language = {en} } @inproceedings{RamsauerBulwahnLohmannetal., author = {Ramsauer, Ralf and Bulwahn, Lukas and Lohmann, Daniel and Mauerer, Wolfgang}, title = {The Sound of Silence : Mining Security Vulnerabilities from Secret Integration Channels in Open-Source Projects}, series = {Proceedings of the 2020 ACM SIGSAC Conference on Cloud Computing Security Workshop: 09.11.2020, virtual event}, booktitle = {Proceedings of the 2020 ACM SIGSAC Conference on Cloud Computing Security Workshop: 09.11.2020, virtual event}, editor = {Zhang, Yinqian and Sion, Radu}, publisher = {ACM}, address = {New York, NY, USA}, isbn = {9781450380843}, doi = {10.1145/3411495.3421360}, pages = {147 -- 157}, abstract = {Public development processes are a key characteristic of open source projects. However, fixes for vulnerabilities are usually discussed privately among a small group of trusted maintainers, and integrated without prior public involvement. This is supposed to prevent early disclosure, and cope with embargo and non-disclosure agreement (NDA) rules. While regular development activities leave publicly available traces, fixes for vulnerabilities that bypass the standard process do not. We present a data-mining based approach to detect code fragments that arise from such infringements of the standard process. By systematically mapping public development artefacts to source code repositories, we can exclude regular process activities, and infer irregularities that stem from non-public integration channels. For the Linux kernel, the most crucial component of many systems, we apply our method to a period of seven months before the release of Linux 5.4. We find 29 commits that address 12 vulnerabilities. For these vulnerabilities, our approach provides a temporal advantage of 2 to 179 days to design exploits before public disclosure takes place, and fixes are rolled out. Established responsible disclosure approaches in open development processes are supposed to limit premature visibility of security vulnerabilities. However, our approach shows that, instead, they open additional possibilities to uncover such changes that thwart the very premise. We conclude by discussing implications and partial countermeasures.}, language = {en} } @article{RichterZabel, author = {Richter, Stefanie and Zabel, Ronald}, title = {Potenzial psychiatrischer Institutsambulanzen nutzen : Leitliniengerechte Versorgung von Menschen mit Demenz auf dem Land}, series = {NeuroTransmitter}, volume = {31}, journal = {NeuroTransmitter}, number = {12}, publisher = {Springer}, doi = {10.1007/s15016-020-7592-9}, pages = {20 -- 23}, abstract = {Seit Ende der 1980er-Jahre ist die psychiatrische Institutsambulanz (PIA) zur Umsetzung einer leitliniengerechten Versorgung von Menschen mit Demenz im l{\"a}ndlichen Raum im \S 118 Sozialgesetzbuch (SGB) V verankert [1, 2]. Die rechtlichen Rahmenbedingungen des \S 118 SGB V und die praktische Ausgestaltung entsprechender Krankenhausambulanzen auf Grundlage vertraglicher Regelungen zwischen den Krankenkassen, ihren Landesverb{\"a}nden und den Krankenh{\"a}usern erm{\"o}glicht es heute auch in l{\"a}ndlichen Regionen eine leitliniengerechte Versorgung von Menschen mit Demenz umzusetzen. Der folgende Beitrag beleuchtet das Potenzial einer PIA anhand eines Praxisbeispiels und verweist auf die besondere Relevanz f{\"u}r die Versorgung spezifischer Patientengruppen in der Fl{\"a}che.}, language = {de} } @article{BachmannDuesbergLangeretal., author = {Bachmann, Michael and D{\"u}sberg, Felix and Langer, Christoph and Herdl, Florian and Bergbreiter, Lukas and Dams, Florian and Miyakawa, Natuski and Eggert, Tobias and Pahlke, Andreas and Edler, Simon and Prommesberger, Christian and Ławrowski, Robert Damian and Hausladen, Matthias and Schreiner, Rupert}, title = {Vacuum-sealed field emission electron gun}, series = {Journal of Vacuum Science \& Technology B}, volume = {38}, journal = {Journal of Vacuum Science \& Technology B}, number = {2}, publisher = {AIP Publishing}, doi = {10.1116/1.5139316}, abstract = {A compact vacuum-sealed field emission electron gun with an operation voltage below 5 kV is presented. With a 150 nm thick pyrolytic carbon membrane, a transmission of 40\% at 5 kV is obtained. For more than 2500 h of continuous operation at an emission current of 100 nA, no significant increase (<50V ) and almost no degradation were found. From this measurement, a lifetime of more than 10 000 h at continuous operation with approximately a linear increase of the extraction voltage from about 545 V to about 730 V is predicted. This electron source enables application of field emitter arrays in poor vacuum or even ambient pressure. ACKNOWLEDGMENT This work was supported by the German Federal Ministry for Economic Affairs and Energy under Project No. ZF4081502GM8. C.P., R.L., M.H., and R.S. were supported by Grant No. ZF4562901GM8.}, language = {en} } @inproceedings{SchorrBoehmZentneretal., author = {Schorr, Philipp and B{\"o}hm, Valter and Zentner, Lena and Zimmermann, Klaus}, title = {Design of a Vibration Driven Motion System Based on a Multistable Tensegrity Structure}, series = {ICINCO 2018: proceedings of the 15th International Conference on Informatics in Control, Automation and Robotics, Porto, Portugal, July 29-31, 2018}, volume = {613}, booktitle = {ICINCO 2018: proceedings of the 15th International Conference on Informatics in Control, Automation and Robotics, Porto, Portugal, July 29-31, 2018}, editor = {Gusikhin, Oleg and Madani, Kurosh}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-31992-2}, doi = {10.1007/978-3-030-31993-9_14}, pages = {302 -- 317}, abstract = {In this paper a novel approach to realize a uniaxial bidirectional vibration driven motion system with controllable direction of motion is investigated. The considered motion system bases on a tensegrity structure with multiple stable equilibrium configurations. The structure is in contact with a horizontal plane due to gravity and the actuation is realized by the harmonic change of the length of a selected member. Beside varying the actuation parameters, the direction of motion can be controlled by changing the equilibrium configuration of the tensegrity structure. In this paper the topology of the tensegrity structure and the parameter values are chosen appropriately to provide two symmetric equilibrium configurations. A change of the equilibrium state yields a novel configuration of the entire motion system which is symmetric to the original state. Utilizing the symmetry of the system the same actuation yields an opposite motion. This approach represents a reliable opportunity to control the direction of motion by changing the equilibrium state for constant actuation parameters. This paper focuses on the parameter selection and the design of the actuation of the vibration driven motion system. The working principle of the vibration driven motion system is verified by numerical simulations. This contribution represents the theoretical investigation for the further development of a prototype.}, language = {en} }