TY - GEN AU - Büttner, Nils AU - Süßmann, Johannes ED - Gerstner, Jan ED - Heller, Jakob C. ED - Schmitt, Christian ID - 35060 SN - 978-3-476-05864-5 T2 - Handbuch Idylle. Verfahren – Traditionen – Theorien TI - [Art.] Idylle und Natur in Aufklärung und Empfindsamkeit ER - TY - GEN AU - Süßmann, Johannes ID - 35067 TI - Gegenreformation und verpaßte Aufklärung. Die Gründung der Academia Theodoriana 1614 und ihre Entwicklung im 17. und 18. Jahrhundert. Videographierter Vortrag für die Ringvorlesung zum fünfzigjährigen Bestehen der Gesamthochschule Paderborn am 13. April 2022 in Paderborn ER - TY - JOUR AB - Clinching is a very cost-efficient method for joining two or more sheets made of identical or different materials. However, the current evaluation methods cannot confirm the critical geometrical features of joints such as neck thickness, undercut, and bottom thickness. Furthermore, the effects caused by joining process such as elastic deformation and crack-closure are significant for the joining quality, but often earn insufficient attention. Therefore, computed tomography (CT) and Transient Dynamic Analysis (TDA) as an ultrasonic testing and evaluation procedure are combined to overcome the obstacles mentioned above. In order to have a well-defined and reproducible typical geometrical error in clinching, specimens with a pre-specified lateral offset of the punch with 0.1 mm, 0.2 mm are as well as with no lateral offset are investigated using CT. The specimens are treated with conductive copper varnish in varying intensities to support the two sheets' distinguishability in the CT measurement. The subsequently extracted surfaces from CT-scan data are used to create three-dimensional models for a numerical Transient Dynamic Analysis. Hereby, a harmonic force is applied to one sheet and the transferred energy is determined at the opposite side of the clinch point on the other sheet. The transmitted energy can be used as a quantitative measure for the joining quality. This setup is simulated by means of Finite-Element-Method and the specimens are investigated experimentally using a piezo actuator and a piezo sensor. The novelty of the results presented here is the completely non-destructive investigation of joint specimen by CT of similar materials with a contrast given foil in between the sheets and the subsequent TDA, which can easily detect difference between the specimens by evaluation of the energy dissipation of the joints. AU - Köhler, D. AU - Sadeghian, B. AU - Troschitz, J. AU - Kupfer, R. AU - Gude, M. AU - Brosius, A. ID - 30626 JF - Journal of Advanced Joining Processes TI - Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis VL - 5 ER - TY - JOUR AB - Continuous fiber reinforced thermoplastics (CFRT)/steel hybrid parts offer promising properties and possibilities, which can exceed the capabilities of both individual materials. In this case, the joining operation presents the main challenge. This paper studies the direct pin pressing where metallic pins with undercutting geometries, protruding from the metal component, are inserted into a locally infrared heated CFRT component. The aim is to investigate the joining process with a focus on the filling of the undercut features with matrix and fibers to create a primarily form-fitting joint. For good mechanical properties of the joint, it is crucial, that the undercutting features are filled and do not lead to significant deconsolidations. The pin structures are manufactured from 42CrMo4 steel on a cnc-lathe and are joined via welding with HCT600+Zn sheet metal. The CFRT samples are manufactured from polypropylene and approximately 45% vol. unidirectional glass fibers. In the scope of this study, different pin geometries are joined with varying process settings and micro sections of the joints are investigated via reflected light microscopy. It could be shown that the undercuts can be completely filled with matrix and fiber material using the described process route. Based on the optical investigations a suitable setting of joining parameters is defined and lap shear as well as cross head samples are manufactured and experimentally tested. It could be seen that independently from the pin geometry the lap shear strength was primarily limited due to shear failure of the pin structures and it is assumed that the base diameter and pin strength predominantly determine the joint strength. Cross head samples failed due to pin extraction. Here, a significant increase of the joint strength with undercutting features could be shown in comparison to cylindrical reference pins. AU - Popp, J. AU - Drummer, D. ID - 30625 JF - Journal of Advanced Joining Processes TI - Joining of continuous fiber reinforced thermoplastic/steel hybrid parts via undercutting pin structures and infrared heating VL - 5 ER - TY - JOUR AB - In addition to brazing and welding processes, mechanical joining processes such as clinching are increasingly being used. Clinch joints offer an advantage over metallurgical joining processes by giving the possibility of joining different material combinations without typical drawbacks. Thereby clinching offers an enormous advantage for lightweight construction. An additional benefit is a great variability in the geometric shapes of the toolsets, which ensure optimum adaptation of the clinching process on variations of the joining elements such as e.g. the sheet thickness. However, the vast variability is also one of the major challenges regarding the prediction of the joint reliability. In the work presented, the effect of different toolset geometries was investigated with a particular focus on the interaction between geometrical features and deformation-induced microstructural changes. Light optical and electron microscopy techniques, as well as micro-hardness measurements, were performed. The results were evaluated and discussed concerning the material's deformation behavior, the change in geometrical shape and the microstructural evolution due to the different tool geometries. The findings point out the main influence factors regarding the mechanical properties in general and the fatigue behavior in particular. AU - Ewenz, L. AU - Kuczyk, M. AU - Zimmermann, M. ID - 30624 JF - Journal of Advanced Joining Processes TI - Effect of the tool geometry on microstructure and geometrical features of clinched aluminum VL - 5 ER - TY - JOUR AU - Gröger, B. AU - Würfel, V. AU - Hornig, A. AU - Gude, M. ID - 30622 JF - Journal of Advanced Joining Processes TI - Forming process induced material structure of fibre-reinforced thermoplastics - Experimental and numerical investigation of a bladder-assisted moulding process VL - 5 ER - TY - JOUR AB - To achieve the climate objectives, various measures are taken to increase the efficiency of raw materials and energies used. A sector with a large proportion of the global consumption of resources is the mobility sector. To increase the efficiency in this field, large efforts are made to reduce the weight of moving masses. One approach is the use of multi-material systems, which utilises different materials and their specific properties depending on the local requirements. Multi-material systems consist often of materials which differ in strength and density, for example, high-strength steels, aluminium alloys or polymers. Additionally, such a system can utilise different geometries of the components to be joined, characterised for example by varying sheet thicknesses. A central challenge of producing these systems is the joining of the individual components. This requires robust joining processes capable of covering the entire spectrum of possible variants and is feasible for different physical properties of the materials. Since conventional joining processes are rather rigid and have difficulty reacting to changing process and disturbance variables, new joining processes are necessary. With the objective of being able to react versatile to varying parameters, a process combination consisting of a semi-tubular self-piercing riveting process and orbital forming process with adjustable tumbling kinematic is introduced. Due to the process combination of tumbling and self-piercing riveting, mutual influences of the two process components are analysed in regard to material flow and process forces. Further, the investigations show the influence of a varying tumbling angle on the joining process itself and how the characteristic properties undercut, rivet head end position and residual sheet thickness of the joint are affected. The material used for the joining partners is an aluminium alloy EN AW-6014 typical for multi-material systems in the automotive industry and the rivets are from type Rivset C produced by the Böllhoff company. AU - Wituschek, S. AU - Lechner, M. ID - 30717 JF - Production Engineering TI - Investigation of the influence of the tumbling angle on a tumbling self-piercing riveting process ER - TY - JOUR AB - Clinching is a joining process that is becoming more and more important in industry due to the increasing use of multi-material designs. Despite the already widespread use of the process, there is still a need for research to understand the mechanisms and design of clinched joints. In contrast to the tool parameters, process and material disturbances have not yet been investigated to a relatively large extent. However, these also have a great influence on the properties and applicability of clinching. The effect of process disturbances on the clinched joint are investigated with numerical and experimental methods. The investigated process variations are the history of the sheets using the pre-hardening of the material, different sheet thicknesses, sheet arrangements and punch strokes. For the consideration of the material history, a specimen geometry for pre-stretching specimens in uniaxial tension is used, from which the pre-stretched secondary specimens are taken. A finite element model is set up for the numerical investigations. Suitable clinching tools are selected. With the simulation, selected process influences can be examined. The effort of the numerical investigations is considerably reduced with the help of a statistical experimental design according to Taguchi. To confirm the simulation results, experimental investigations of the clinch point geometry by using micrographs and the shear strength of the clinched joint are performed. The analysis of the influence of difference disturbance factors on the clinching process demonstrate the importance of the holistic view of the clinching process. AU - Steinfelder, C. AU - Acksteiner, J. AU - Guilleaume, C. AU - Brosius, A. ID - 30629 JF - Production Engineering TI - Analysis of the interactions between joint and component properties during clinching ER - TY - JOUR AB - Surface determination is an essential step of the measurement process in industrial X-ray computed tomography (XCT). The starting point of the surface determination process step is a single grey value threshold within a voxel volume in conventional surface determination methods. However, this value is not always found in the reconstructed volume in the local environment of the surface of the measurement object due to various artefacts, so that none or incorrect surfaces are determined. In order to find surfaces independently of a single grey value, a three-dimensional approach of the initial contour determination based on a Prewitt edge detection algorithm is presented in this work. This method is applied to different test specimens and specimen compositions which, due to their material or material constellation, their geometric properties with regard to surfaces and interfaces as well as their calibrated size and length dimensions, embody relevant properties in the examination of joining connections. It is shown that by using the surface determination method in the measurement process, both a higher metrological structure resolution and interface structure resolution can be achieved. Surface artefacts can be reduced by the application and it is also an approach to improved surface finding for the multi-material components that are challenging for XCT. AU - Busch, M. AU - Hausotte, T. ID - 30640 JF - Production Engineering TI - Application of an edge detection algorithm for surface determination in industrial X-ray computed tomography ER - TY - JOUR AB - The work carried out is based on the thesis properties of clinched joints are determined by the proportions of binding mechanisms form-closure, force-closure and material-closure. To describe the acting binding mechanisms and thus to derive the joint properties, detailed knowledge of the local effect of the individual binding mechanisms is necessary to ensure their targeted adjustment by the joining process. The targeted setting of different proportions of the binding mechanisms is achieved firstly via tool geometry and secondly via surface condition of the joined parts. An introduced form-closure component can be quantified by metallographic cross section with subsequent measurement of the quality-determining parameters such as undercut, penetration depth and neck thickness. To qualify the force-closure component, a torsional load can be applied mechanically at rotationally symmetrical clinch joints. This also allows the influence of different surface conditions on the tribological system to be quantified. Measurement of electrical resistance can reveal the binding mechanisms of force- and material-closure. These investigations are carried out on an aluminum joining part combination of the same type. As a result of these investigations, the clinched joints can be designed according to the load occurring in the later life cycle in the form of an optimum and compromise variant with regard to minimum loads to be transmitted mechanically, electrically with regard to low resistance or manufacturing with minimum energy input. AU - Kalich, J. AU - Füssel, U. ID - 30628 JF - Production Engineering TI - Design of clinched joints on the basis of binding mechanisms ER - TY - JOUR AB - Additive plasticity in the logarithmic strain space is compared to multiplicative plasticity for various loading cases including coaxial and non-coaxial plastic deformations. Even though both finite plasticity approaches are based on total Lagrangian descriptions, the former is popular due to its inherent similarity to the infinitesimal theory and its easy extensibility. However, since its introduction several limitations of additive plasticity in the logarithmic strain space have been discovered. In this study, these problems such as stress rotation and softening are considered, revealing that fundamental differences compared to multiplicative plasticity occur for non-coaxial plastic deformations. We focus in particular on the observed softer response of the additive based approach, which is analysed in depth using three numerical examples including two well-known benchmarks for finite plasticity. By means of these finite element simulations the softer and possibly even localising response of additive plasticity in the logarithmic strain space is confirmed. AU - Friedlein, J. AU - Mergheim, J. AU - Steinmann, P. ID - 30627 JF - International Journal of Solids and Structures TI - Observations on additive plasticity in the logarithmic strain space at excessive strains VL - 239-240 ER - TY - JOUR AU - Chang, M. AU - Büchel, Daniel AU - Reinecke, K. AU - Lehmann, T. AU - Baumeister, Jochen ID - 29182 JF - European Journal of Neuroscience KW - General Neuroscience SN - 0953-816X TI - Ecological Validity in Exercise Neuroscience Research: A Systematic Investigation ER - TY - CONF AB - Modern services often comprise several components, such as chained virtual network functions, microservices, or machine learning functions. Providing such services requires to decide how often to instantiate each component, where to place these instances in the network, how to chain them and route traffic through them. To overcome limitations of conventional, hardwired heuristics, deep reinforcement learning (DRL) approaches for self-learning network and service management have emerged recently. These model-free DRL approaches are more flexible but typically learn tabula rasa, i.e., disregard existing understanding of networks, services, and their coordination. Instead, we propose FutureCoord, a novel model-based AI approach that leverages existing understanding of networks and services for more efficient and effective coordination without time-intensive training. FutureCoord combines Monte Carlo Tree Search with a stochastic traffic model. This allows FutureCoord to estimate the impact of future incoming traffic and effectively optimize long-term effects, taking fluctuating demand and Quality of Service (QoS) requirements into account. Our extensive evaluation based on real-world network topologies, services, and traffic traces indicates that FutureCoord clearly outperforms state-of-the-art model-free and model-based approaches with up to 51% higher flow success ratios. AU - Werner, Stefan AU - Schneider, Stefan Balthasar AU - Karl, Holger ID - 29220 KW - network management KW - service management KW - AI KW - Monte Carlo Tree Search KW - model-based KW - QoS T2 - IEEE/IFIP Network Operations and Management Symposium (NOMS) TI - Use What You Know: Network and Service Coordination Beyond Certainty ER - TY - JOUR AU - Schmolke, Tobias AU - Krüger, Christopher AU - Merdivan, David AU - Meschut, Gerson ID - 29296 IS - 1 JF - ATZ worldwide TI - Weight-optimized Battery Housings for Volume Vehicles VL - 124 ER - TY - CONF AU - Sander, Sascha AU - Teutenberg, Dominik AU - Meschut, Gerson AU - Kötz, Fabian AU - Matzenmiller, Anton AU - Kasper, Yann AU - Ummenhofer, Thomas ID - 29342 T2 - 22. Kolloquium Gemeinsame Forschung in der Klebtechnik TI - Methodenentwicklung zur rechnerischen Auslegung geklebter Stahlverbindungen unter Alterungsbeanspruchung im Stahl- und Anlagenbau ER - TY - JOUR AB - The paper investigates the impact of individual attention on investor risk-taking. We analyze a large sample of trading records from a brokerage service that allows its customers to trade contracts-for-differences (CFD), and sends standardized push messages on recent stock performance to its client investors. The advantage of this sample is that it allows us to isolate the "push" messages as individual attention triggers, which we can directly link to the same individuals' risk-taking. A particular advantage of CFD trading is that it allows investors to make use of leverage, which provides us a pure measure of investors' willingness to take risks that is independent of the decision to purchase a particular stock. Leverage is a major catalyst of speculative trading, as it increases the scope of extreme returns, and enables investors to take larger positions than what they can afford with their own capital. We show that investors execute attention-driven trades with higher leverage, compared to their other trades, as well as those of other investors who are not alerted by attention triggers. AU - Arnold, Marc AU - Pelster, Matthias AU - Subrahmanyam, Marti G. ID - 21571 IS - 2 JF - Journal of Financial Economics TI - Attention triggers and investors' risk-taking VL - 143 ER - TY - CONF AB - This paper introduces the project Scale4Edge. The project is focused on enabling an effective RISC-V ecosystem for optimization of edge applications. We describe the basic components of this ecosystem and introduce the envisioned demonstrators, which will be used in their evaluation. AU - Ecker, Wolfgang AU - Adelt, Peer AU - Müller, Wolfgang AU - Heckmann, Reinhold AU - Krstic, Milos AU - Herdt, Vladimir AU - Drechsler, Rolf AU - Angst, Gerhard AU - Wimmer, Ralf AU - Mauderer, Andreas AU - Stahl, Rafael AU - Emrich, Karsten AU - Mueller-Gritschneder, Daniel AU - Becker, Bernd AU - Scholl, Philipp AU - Jentzsch, Eyck AU - Schlamelcher, Jan AU - Grüttner, Kim AU - Bernardo, Paul Palomero AU - Brinkmann, Oliver AU - Damian, Mihaela AU - Oppermann, Julian AU - Koch, Andreas AU - Bormann, Jörg AU - Partzsch, Johannes AU - Mayr, Christian AU - Kunz, Wolfgang ID - 29302 T2 - In Proceedings of the Design Automation and Test Conference and Exhibition (DATE 2022) TI - The Scale4Edge RISC-V Ecosystem ER - TY - JOUR AU - Schmolke, Tobias AU - Krüger, Christopher AU - Merdivan, David AU - Meschut, Gerson ID - 29295 IS - 1 JF - ATZ - Automobiltechnische Zeitschrift TI - Gewichtsoptimierte Batteriegehäuse für Volumenfahrzeuge VL - 124 ER - TY - CHAP AU - Mildorf, Jarmila ED - Schachtner, Christina ED - Drews, Albert ID - 29355 T2 - Erzählte Welt: Sinnstiftung in Zeiten kultureller und politischer Umbrüche TI - Durch Andere sich selbst erzählen: Figuren der Selbststilisierung in autobiographischen Schriften von Alan Bennett und Candia McWilliam VL - 9 ER - TY - JOUR AU - Sperling, Martina AU - Schryen, Guido ID - 23415 IS - 2 JF - European Journal of Operational Research (EJOR) TI - Decision Support for Disaster Relief: Coordinating Spontaneous Volunteers VL - 299 ER - TY - JOUR AU - Koldewey, Christian AU - Rasor, Anja AU - Reinhold, Jannik AU - Gausemeier, Jürgen AU - Dumitrescu, Roman AU - Chohan, Nadia AU - Frank, Maximilian ID - 27776 JF - Technological Forecasting and Social Change SN - 0040-1625 TI - Aligning strategic position, behavior, and structure for smart service businesses in manufacturing ER - TY - CONF AB - Explainable Artificial Intelligence (XAI) is currently an important topic for the application of Machine Learning (ML) in high-stakes decision scenarios. Related research focuses on evaluating ML algorithms in terms of interpretability. However, providing a human understandable explanation of an intelligent system does not only relate to the used ML algorithm. The data and features used also have a considerable impact on interpretability. In this paper, we develop a taxonomy for describing XAI systems based on aspects about the algorithm and data. The proposed taxonomy gives researchers and practitioners opportunities to describe and evaluate current XAI systems with respect to interpretability and guides the future development of this class of systems. AU - Kucklick, Jan-Peter ID - 29539 KW - Explainable Artificial Intelligence KW - XAI KW - Interpretability KW - Decision Support Systems KW - Taxonomy T2 - Wirtschaftsinformatik 2022 Proceedings TI - Towards a model- and data-focused taxonomy of XAI systems ER - TY - GEN AU - Lienen, Christian AU - Platzner, Marco ID - 29541 TI - ReconROS Executor: Event-Driven Programming of FPGA-accelerated ROS 2 Applications ER - TY - CHAP AB - The digitalization of workplaces can introduce changes on various levels of work activities. Educational research follows this transformation in one of two ways: On the one hand, there is the optimistic perspective of expecting to improve the quality of work and work life; on the other hand, there is the expectation that conditions of work and work life will generally deteriorate. Irrespective of the concrete outcomes of digitalization, a general agreement exists that digitalization will induce changes at workplaces that affect individuals and the tasks they do. At the same time, however, scholars disagree as to whether employees experience these changes in terms of affordances that engage them into learning new processes or if they experience constraints that inhibit further engagement in learning. This chapter explores the particular developments covered under the topic of digitalization at and of work, explains particular challenges of the introduction of cyber-physical systems and analyzes consequences for workplace learning. It focuses on conceptual change as a theoretical framework for understanding the quality of learning processes that seem inevitable in order to cope with the new requirements and – more importantly – to use the potentials of the new technologies. It then sketches the poor state of empirical research conducted in this area – so far limited to exploratory field studies – even in times of corona, which has boosted the digital transformation. The chapter ends with a description of the potential and problems of – at best interdisciplinary – research into learning at digitalized workplaces. AU - Harteis, Christian AU - Goller, Michael AU - Gerholz, Karl-Heinz ED - Malloch, Margaret ED - Cairns, Len ED - Evans, Karen ED - O'Connor, Bridget N. ID - 29104 SN - 978-1-5264-9111-4 T2 - The SAGE Handbook of Learning and Work TI - Digitalization of work: Challenges for workplace learning ER - TY - JOUR AB - Im Praxissemester (PS) sind Mentor*innen für Studierende wichtige Bezugspersonen, die sie u. a. bei der Planung, Durchführung und Reflexion von Unterricht begleiten. Während z.B. zur Kompetenzentwicklung Studierender im PS mehrere Erkenntnisse vorliegen, ist die Perspektive von Mentor*innen bisher wenig untersucht. Dieser Bericht zielt darauf, die Relevanz von Mentor*innen herauszuarbeiten, Forschungsdesiderate zu umreißen und Handlungsoptionen aufzuzeigen. AU - Caruso, Carina AU - Goller, Michael ID - 29103 IS - 4 JF - Die Deutsche Schule KW - Schlagwörter: Mentoring KW - Praxissemester KW - Professionalisierung TI - Die Relevanz von Mentor*innen für die Professionalisierung von angehenden Lehrkräften im Praxissemester: Forschungsdesiderate und Handlungsoptionen VL - 114 ER - TY - THES AB - Modern-day communication has become more and more digital. While this comes with many advantages such as a more efficient economy, it has also created more and more opportunities for various adversaries to manipulate communication or eavesdrop on it. The Snowden revelations in 2013 further highlighted the seriousness of these threats. To protect the communication of people, companies, and states from such threats, we require cryptography with strong security guarantees. Different applications may require different security properties from cryptographic schemes. For most applications, however, so-called adaptive security is considered a reasonable minimal requirement of security. Cryptographic schemes with adaptive security remain secure in the presence of an adversary that can corrupt communication partners to respond to messages of the adversaries choice, while the adversary may choose the messages based on previously observed interactions. While cryptography is associated the most with encryption, this is only one of many primitives that are essential for the security of digital interactions. This thesis presents novel identity-based encryption (IBE) schemes and verifiable random functions (VRFs) that achieve adaptive security as outlined above. Moreover, the cryptographic schemes presented in this thesis are proven secure in the standard model. That is without making use of idealized models like the random oracle model. AU - Niehues, David ID - 29763 KW - public-key cryptography KW - lattices KW - pairings KW - verifiable random functions KW - identity-based encryption TI - More Efficient Techniques for Adaptively-Secure Cryptography ER - TY - JOUR AB - Distributed, software-intensive systems (e.g., in the automotive sector) must fulfill communication requirements under hard real-time constraints. The requirements have to be documented and validated carefully using a systematic requirements engineering (RE) approach, for example, by applying scenario-based requirements notations. The resources of the execution platforms and their properties (e.g., CPU frequency or bus throughput) induce effects on the timing behavior, which may lead to violations of the real-time requirements. Nowadays, the platform properties and their induced timing effects are verified against the real-time requirements by means of timing analysis techniques mostly implemented in commercial-off-the-shelf tools. However, such timing analyses are conducted in late development phases since they rely on artifacts produced during these phases (e.g., the platform-specific code). In order to enable early timing analyses already during RE, we extend a scenario-based requirements notation with allocation means to platform models and define operational semantics for the purpose of simulation-based, platform-aware timing analyses. We illustrate and evaluate the approach with an automotive software-intensive system. AU - Holtmann, Jörg AU - Deantoni, Julien AU - Fockel, Markus ID - 31071 JF - Software and Systems Modeling KW - Modeling and Simulation KW - Software SN - 1619-1366 TI - Early timing analysis based on scenario requirements and platform models ER - TY - JOUR AU - Ring, Julia AU - Tadic, Jelena AU - Ristic, Selena AU - Poglitsch, Michael AU - Bergmann, Martina AU - Radic, Nemanja AU - Mossmann, Dirk AU - Liang, YongTian AU - Maglione, Marta AU - Jerkovic, Andrea AU - Hajiraissi, Roozbeh AU - Hanke, Marcel AU - Küttner, Victoria AU - Wolinski, Heimo AU - Zimmermann, Andreas AU - Domuz Trifunović, Lana AU - Mikolasch, Leonie AU - Moretti, Daiana N AU - Broeskamp, Filomena AU - Westermayer, Julia AU - Abraham, Claudia AU - Schauer, Simon AU - Dammbrueck, Christopher AU - Hofer, Sebastian J AU - Abdellatif, Mahmoud AU - Grundmeier, Guido AU - Kroemer, Guido AU - Braun, Ralf J AU - Hansen, Niklas AU - Sommer, Cornelia AU - Ninkovic, Mirjana AU - Seba, Sandra AU - Rockenfeller, Patrick AU - Vögtle, Friederike‐Nora AU - Dengjel, Jörn AU - Meisinger, Chris AU - Keller, Adrian AU - Sigrist, Stephan J AU - Eisenberg, Tobias AU - Madeo, Frank ID - 30739 JF - EMBO Molecular Medicine KW - Molecular Medicine SN - 1757-4676 TI - The HSP40 chaperone Ydj1 drives amyloid beta 42 toxicity VL - 14 ER - TY - CONF AU - Heyser, Per AU - Meschut, Gerson AU - Nehls, Thomas AU - Scharr, Christian AU - Froitzheim, Pascal AU - Flügge, Wilko AU - Wiesenmayer, Sebastian AU - Merklein, Marion ID - 31150 SN - 978-3-86776-586-2 T2 - Pressen, Systeme, Prozesse der Zukunft Effizienz + Digitalisierung TI - Metamodellbasierte Prozesskette - Umformen-Schneiden-Spannen-Fügen VL - T 50 ER - TY - BOOK AU - Meschut, Gerson AU - Heyser, Per AU - Merklein, Marion AU - Wiesenmayer, Sebastian AU - Flügge, Wilko AU - Scharr, Christian AU - Nehls, Thomas ID - 31149 SN - 978-3-86776-636-4 TI - Konzeption einer adaptiven Prozesskette für das mechanische Fügen VL - 578 ER - TY - CONF AU - Heyser, Per AU - Wiesenmayer, Sebastian AU - Nehls, Thomas AU - Scharr, Christian AU - Flügge, Wilko AU - Merklein, Marion AU - Meschut, Gerson ID - 31151 T2 - SMART PRODUCTION 2022: DIGITALIZING AUTOMOTIVE MANUFACTURING TI - Smart process chain – data analysis in sheet metal processing for joinability prediction ER - TY - GEN AU - Chen, Mei-Hua AU - Mudgal, Garima AU - Chen, Wei-Fan AU - Wachsmuth, Henning ID - 31068 T2 - EUROCALL TI - Investigating the argumentation structures of EFL learners from diverse language backgrounds ER - TY - CONF AU - Bernemann, Sören Antonius AU - Maćkowiak, Jan AU - Maćkowiak, Jerzy AU - Bertling, René AU - Lutters, Nicole AU - Kenig, Eugeny ID - 31171 TI - Entwicklung eines innovativen Trennapparates zur Stickstoffrückgewinnung aus landwirtschaftlichen Abfällen ER - TY - JOUR AB - Safety-critical systems have to follow extremely high dependability requirements as specified in the standards for automotive, air, and space applications. The required high fault coverage at runtime is usually obtained by a combination of concurrent error detection or correction and periodic tests within rather short time intervals. The concurrent scheme ensures the integrity of computed results while the periodic test has to identify potential aging problems and to prevent any fault accumulation which may invalidate the concurrent error detection mechanism. Such periodic built-in self-test (BIST) schemes are already commercialized for memories and for random logic. The paper at hand extends this approach to interconnect structures. A BIST scheme is presented which targets interconnect defects before they will actually affect the system functionality at nominal speed. A BIST schedule is developed which significantly reduces aging caused by electromigration during the lifetime application of the periodic test. AU - Sadeghi-Kohan, Somayeh AU - Hellebrand, Sybille AU - Wunderlich, Hans-Joachim ID - 29351 JF - Journal of Electronic Testing KW - Electrical and Electronic Engineering SN - 0923-8174 TI - Stress-Aware Periodic Test of Interconnects ER - TY - GEN AU - Sadeghi-Kohan, Somayeh AU - Hellebrand, Sybille AU - Wunderlich, Hans-Joachim ID - 29890 KW - WORKSHOP TI - EM-Aware Interconnect BIST ER - TY - JOUR AU - Verma, A.K. AU - Bopp, F. AU - Finley, J.J. AU - Jonas, B. AU - Zrenner, A. AU - Reuter, Dirk ID - 31241 JF - Journal of Crystal Growth KW - Materials Chemistry KW - Inorganic Chemistry KW - Condensed Matter Physics SN - 0022-0248 TI - Low Areal Densities of InAs Quantum Dots on GaAs(100) Prepared by Molecular Beam Epitaxy ER - TY - JOUR AU - Klingsiek, Katrin AU - John, Thomas AU - Kundisch, Dennis ID - 30295 IS - 5 JF - die hochschullehre TI - Procrastination in the Looking Glass of Self-Awareness: Can Gamified Self-Monitoring Reduce Academic Procrastination? VL - 8 ER - TY - JOUR AU - Subban, Pearl K. AU - Bradford, Brent AU - Sharma, Umesh AU - Loreman, Tim AU - Avramidis, Elias AU - Kullmann, Harry AU - Sahli Lozano, Caroline AU - Romano, Alessandra AU - Woodcock, Stuart ID - 31023 JF - European Journal of Special Needs Education TI - Does it really take a village to raise a child? Reflections on the need for collective responsibility in inclusive education VL - 37 ER - TY - JOUR AB - Highly directive antennas with the ability of shaping radiation patterns in desired directions are essential for efficient on-chip optical communication with reduced cross talk. In this paper, we design and optimize three distinct broadband traveling-wave tantalum pentoxide antennas exhibiting highly directional characteristics. Our antennas contain a director and reflector deposited on a glass substrate, which are excited by a dipole emitter placed in the feed gap between the two elements. Full-wave simulations in conjunction with global optimization provide structures with an enhanced linear directivity as high as 119 radiating in the substrate. The high directivity is a result of the interplay between two dominant TE modes and the leaky modes present in the antenna director. Furthermore, these low-loss dielectric antennas exhibit a near-unity radiation efficiency at the operational wavelength of 780 nm and maintain a broad bandwidth. Our numerical results are in good agreement with experimental measurements from the optimized antennas fabricated using a two-step electron-beam lithography, revealing the highly directive nature of our structures. We envision that our antenna designs can be conveniently adapted to other dielectric materials and prove instrumental for inter-chip optical communications and other on-chip applications. AU - Farheen, Henna AU - Yan, Lok-Yee AU - Quiring, Viktor AU - Eigner, Christof AU - Zentgraf, Thomas AU - Linden, Stefan AU - Förstner, Jens AU - Myroshnychenko, Viktor ID - 31329 IS - 11 JF - Optics Express KW - tet_topic_opticalantenna SN - 1094-4087 TI - Broadband optical Ta2O5 antennas for directional emission of light VL - 30 ER - TY - CHAP AU - Elit, Stefan ED - Schreckenberg, Stefan ED - Schumann, Daniel Verdú ID - 31391 T2 - Aufbruch und Krise. Ästhetische/Narrative Auseinandersetzungen mit der spanischen Transición und der deutschen ‚Wende‘ (Germanisch-Romanische Monatsschrift. Beiheft) TI - Dekonstruktionen des Staatssozialismus (und mehr). Komische Helden der Wende- und Nachwendezeit in deutschsprachiger Literatur ER - TY - CONF AB - Students are not aware and have little understanding of collecting and processing personal data in their everyday contexts of interaction with data-driven digital artifacts. To be aware of where, how and why data are collected and processed is important to be self-determined. Therefore, we develop and evaluate a teaching sequence to provide reasoning about data as a fundamental aspect of statistical literacy. This teaching sequences deals with the context of interaction with a cellular network where location data are collected. Students get real location data from an unknown person which can be explored with the aim to characterize the person. Students gain different insights by using different basic filters and explain how they achieve these. The results of the exploratory study indicate that students learned to gain insights by exploring given location data and that these insights may describe the person with detailed aspects that may not necessarily be true. AU - Höper, Lukas AU - Podworny, Susanne AU - Schulte, Carsten AU - Frischemeier, Daniel ID - 31407 T2 - Proceedings of the IASE 2021 Satellite Conference TI - Exploration of Location Data: Real Data in the Context of Interaction with a Cellular Network ER - TY - JOUR AB - Optical geometric phase encoded by in-plane spatial orientation of microstructures has promoted the rapid development of numerous functional meta-devices. However, pushing the concept of the geometric phase toward the acoustic community still faces challenges. In this work, we utilize two acoustic nonlocal metagratings that could support a direct conversion between an acoustic plane wave and a designated vortex mode to obtain the acoustic geometric phase, in which an orbital angular momentum conversion process plays a vital role. In addition, we realize the acoustic geometric phases of different orders by merely varying the orientation angle of the acoustic nonlocal metagratings. Intriguingly, according to our developed theory, we reveal that the reflective acoustic geometric phase, which is twice the transmissive one, can be readily realized by transferring the transmitted configuration to a reflected one. Both the theoretical study and experimental measurements verify the announced transmissive and reflective acoustic geometric phases. Moreover, the reconfigurability and continuous phase modulation that covers the 2π range shown by the acoustic geometric phases provide us with the alternatives in advanced acoustic wavefront control. AU - Liu, Bingyi AU - Zhou, Zhiling AU - Wang, Yongtian AU - Zentgraf, Thomas AU - Li, Yong AU - Huang, Lingling ID - 31480 IS - 21 JF - Applied Physics Letters KW - Physics and Astronomy (miscellaneous) SN - 0003-6951 TI - Experimental verification of the acoustic geometric phase VL - 120 ER - TY - JOUR AU - Baswana, Surender AU - Gupta, Shiv AU - Knollmann, Till ID - 31479 JF - Algorithmica KW - Applied Mathematics KW - Computer Science Applications KW - General Computer Science SN - 0178-4617 TI - Mincut Sensitivity Data Structures for the Insertion of an Edge ER - TY - GEN AU - Elit, Stefan ID - 31506 T2 - Arbitrium 40 TI - Friedrich Gottlieb Klopstock: Handexemplar der „Oden“. Kritische Edition, hg. v. Marit Müller, Göttingen 2020 (edition Text 18) ER - TY - JOUR AU - Kobecki, Michal AU - Scherbakov, Alexey V. AU - Kukhtaruk, Serhii M. AU - Yaremkevich, Dmytro D. AU - Henksmeier, Tobias AU - Trapp, Alexander AU - Reuter, Dirk AU - Gusev, Vitalyi E. AU - Akimov, Andrey V. AU - Bayer, Manfred ID - 31541 IS - 15 JF - Physical Review Letters KW - General Physics and Astronomy SN - 0031-9007 TI - Giant Photoelasticity of Polaritons for Detection of Coherent Phonons in a Superlattice with Quantum Sensitivity VL - 128 ER - TY - GEN AB - Knowledge graph embedding research has mainly focused on learning continuous representations of entities and relations tailored towards the link prediction problem. Recent results indicate an ever increasing predictive ability of current approaches on benchmark datasets. However, this effectiveness often comes with the cost of over-parameterization and increased computationally complexity. The former induces extensive hyperparameter optimization to mitigate malicious overfitting. The latter magnifies the importance of winning the hardware lottery. Here, we investigate a remedy for the first problem. We propose a technique based on Kronecker decomposition to reduce the number of parameters in a knowledge graph embedding model, while retaining its expressiveness. Through Kronecker decomposition, large embedding matrices are split into smaller embedding matrices during the training process. Hence, embeddings of knowledge graphs are not plainly retrieved but reconstructed on the fly. The decomposition ensures that elementwise interactions between three embedding vectors are extended with interactions within each embedding vector. This implicitly reduces redundancy in embedding vectors and encourages feature reuse. To quantify the impact of applying Kronecker decomposition on embedding matrices, we conduct a series of experiments on benchmark datasets. Our experiments suggest that applying Kronecker decomposition on embedding matrices leads to an improved parameter efficiency on all benchmark datasets. Moreover, empirical evidence suggests that reconstructed embeddings entail robustness against noise in the input knowledge graph. To foster reproducible research, we provide an open-source implementation of our approach, including training and evaluation scripts as well as pre-trained models in our knowledge graph embedding framework. AU - Demir, Caglar AU - Lienen, Julian AU - Ngonga Ngomo, Axel-Cyrille ID - 31545 T2 - arXiv:2205.06560 TI - Kronecker Decomposition for Knowledge Graph Embeddings ER - TY - JOUR AU - Hanke, Marcel AU - Dornbusch, Daniel AU - Hadlich, Christoph AU - Rossberg, Andre AU - Hansen, Niklas AU - Grundmeier, Guido AU - Tsushima, Satoru AU - Keller, Adrian AU - Fahmy, Karim ID - 31547 JF - Computational and Structural Biotechnology Journal KW - Computer Science Applications KW - Genetics KW - Biochemistry KW - Structural Biology KW - Biophysics KW - Biotechnology SN - 2001-0370 TI - Anion-specific structure and stability of guanidinium-bound DNA origami VL - 20 ER - TY - GEN AB - In semi-supervised learning, the paradigm of self-training refers to the idea of learning from pseudo-labels suggested by the learner itself. Across various domains, corresponding methods have proven effective and achieve state-of-the-art performance. However, pseudo-labels typically stem from ad-hoc heuristics, relying on the quality of the predictions though without guaranteeing their validity. One such method, so-called credal self-supervised learning, maintains pseudo-supervision in the form of sets of (instead of single) probability distributions over labels, thereby allowing for a flexible yet uncertainty-aware labeling. Again, however, there is no justification beyond empirical effectiveness. To address this deficiency, we make use of conformal prediction, an approach that comes with guarantees on the validity of set-valued predictions. As a result, the construction of credal sets of labels is supported by a rigorous theoretical foundation, leading to better calibrated and less error-prone supervision for unlabeled data. Along with this, we present effective algorithms for learning from credal self-supervision. An empirical study demonstrates excellent calibration properties of the pseudo-supervision, as well as the competitiveness of our method on several benchmark datasets. AU - Lienen, Julian AU - Demir, Caglar AU - Hüllermeier, Eyke ID - 31546 T2 - arXiv:2205.15239 TI - Conformal Credal Self-Supervised Learning ER - TY - CONF AU - Çavdar, Serkan AU - Meschut, Gerson ID - 31540 T2 - 45th Annual Meeting of The Adhesion Society TI - Stress-based fatigue lifetime prediction of adhesively bonded joints with hyperelastic deformation behavior ER - TY - THES AB - Mehrzieloptimierung behandelt Probleme, bei denen mehrere skalare Zielfunktionen simultan optimiert werden sollen. Ein Punkt ist in diesem Fall optimal, wenn es keinen anderen Punkt gibt, der mindestens genauso gut ist in allen Zielfunktionen und besser in mindestens einer Zielfunktion. Ein notwendiges Optimalitätskriterium lässt sich über Ableitungsinformationen erster Ordnung der Zielfunktionen herleiten. Die Menge der Punkte, die dieses notwendige Kriterium erfüllen, wird als Pareto-kritische Menge bezeichnet. Diese Arbeit enthält neue Resultate über Pareto-kritische Mengen für glatte und nicht-glatte Mehrzieloptimierungsprobleme, sowohl was deren Berechnung betrifft als auch deren Struktur. Im glatten Fall erfolgt die Berechnung über ein Fortsetzungsverfahren, im nichtglatten Fall über ein Abstiegsverfahren. Anschließend wird die Struktur des Randes der Pareto-kritischen Menge analysiert, welcher aus Pareto-kritischen Mengen kleinerer Subprobleme besteht. Schlussendlich werden inverse Probleme betrachtet, bei denen zu einer gegebenen Datenmenge ein Zielfunktionsvektor gefunden werden soll, für den die Datenpunkte kritisch sind. AU - Gebken, Bennet ID - 31556 TI - Computation and analysis of Pareto critical sets in smooth and nonsmooth multiobjective optimization ER -