Simon Kamm

Abstract

This dataset allows to reproduce the results from the paper "Coupled Simulations and Parameter Inversion for Neural System and Electrophysiological Muscle Models" submitted to GAMM Mitteilungen in September 2023.Find more information about the structure of the dataset and the steps to reproduce the results in the readme.md file.

Abstract

Consistent treatment of large rotations in common Reissner–Mindlin formula-tions is a complicated task. Reissner–Mindlin formulations that use a hierarchicparametrization provide an elegant way to facilitate large rotation shell anal-yses. This can be achieved by the assumption of linearized transverse shearstrains, resulting in an additive split of strain components, which technicallysimplifies implementation of corresponding shell finite elements. The presentstudy aims at validating this assumption by systematically comparing numeri-cal solutions with those of a newly implemented hierarchic and fully nonlinearReissner–Mindlin shell element.

Abstract

In many application domains data from different sources are increasingly available to thoroughly monitor and describe a system or device. Especially within the industrial automation domain, heterogeneous data and its analysis gain a lot of attention from research and industry, since it has the potential to improve or enable tasks like diagnostics, predictive maintenance, and condition monitoring. For data analysis, machine learning based approaches are mostly used in recent literature, as these algorithms allow us to learn complex correlations within the data. To analyze even heterogeneous data and gain benefits from it in an application, data from different sources need to be integrated, stored, and managed to apply machine learning algorithms. In a setting with heterogeneous data sources, the analysis algorithms should also be able to handle data source failures or newly added data sources. In addition, existing knowledge should be used to improve the machine learning based analysis or its training process. To find existing approaches for the machine learning based analysis of heterogeneous data in the industrial automation domain, this paper presents the result of a systematic literature review. The publications were reviewed, evaluated, and discussed concerning five requirements that are derived in this paper. We identified promising solutions and approaches and outlined open research challenges, which are not yet covered sufficiently in the literature.

Abstract

Abstract In einem Bauprojekt arbeiten verschiedene Disziplinen wie Architektur, Ingenieurwesen, Fachplanung und ausführende Bauunternehmen zusammen. Für den Entwurf, die statische Berechnung und die Ausführungsplanung werden unterschiedliche Softwarelösungen eingesetzt. Anpassungen im Entwurf und der Planung müssen zeitaufwendig in jeder einzelnen Softwarelösung manuell eingearbeitet werden. Bei komplexen Geometrien und innovativen Bauweisen sind zusätzliche Analysen und Anpassungen erforderlich, was mit heutigen Softwarelösungen kaum realisierbar ist. Für einen effizienten Datentransfer zwischen verschiedenen Softwareumgebungen wurde COMPAS entwickelt, sodass Innovationen im Bauwesen gefördert werden. COMPAS ist eine Open-Source-Umgebung, welche unabhängig von kommerziellen Softwarelösungen verwendet werden kann. Es verfügt über eine Geometriedatenbank, flexible Datenstrukturen für unterschiedliche Disziplinen und Algorithmen für Berechnungen wie z. B. Tragwerksanalysen. Es gibt zahlreiche COMPAS-Erweiterungen für spezifische Anwendungen wie Montageplanung, Holzbau, Roboterfertigung und additive Fertigung. Anfang 2023 wurde der Verein COMPAS gegründet, um die Weiterentwicklung und Ausbildung voranzutreiben.

Abstract

Mit dem Antritt der grün-roten, gefolgt von der grün-schwarzen Landesregierung in Baden-Württemberg haben dialogische Bürgerbeteiligungsformate in Baden-Württemberg an Bedeutung gewonnen. Sie werden mittlerweile auf allen politischen Ebenen genutzt und finden auch international ein breites Echo. Im Gegensatz zu repräsentativ-demokratischen Wahlen oder direkt-demokratischen Abstimmungen sind sie rechtlich kaum vorgeschrieben. In den meisten Fällen handelt es sich um freiwillig eingesetzte Formate des Austauschs zwischen (nicht organisierten) Bürger*innen, Vertreter*innen der Politik und der Verwaltung sowie gegebenenfalls weiteren zivilgesellschaftlichen oder privatwirtschaftlichen Akteur*innen. Mit ihrer Hilfe soll nicht nur die Input-, sondern auch die Output-Legitimität gestärkt werden. In diesem Band gehen verschiedene Autor*innen unterschiedlichen Fragen zu dialogischer Bürgerinnen- und Bürgerbeteiligung nach. Dabei geht es um methodische Aspekte der Erfassung und Untersuchung dieser Beteiligungsverfahren, um Sichtweisen verschiedener Akteure auf die Verfahren, ebenso wie um die Frage, wie dialogorientierte Formen der Bürgerinnen- und Bürgerbeteiligung besser mit direkt- und/oder repräsentativ-demokratischen Entscheidungsprozessen verzahnt werden können.

Abstract

Zusammenfassung Diese Arbeit befasst sich mit dem Entwurf und dem Aufbau einer kompakten und einfach zu handhabenden Demonstrator-Leiterplatte für die Ansteuerung eines Arbiträrsignalgenerators, welcher am Institut für Elektrische und Optische Nachrichtentechnik entwickelt wurde. Die Anforderungen an die Leiterplatte wurden hierfür allgemeingültig definiert, wodurch ebenso die Ansteuerung aller anderen an diesem Institut bereits entwickelten Halbleiterchips ermöglicht wird. Die funktionalen Anforderungen sind im Wesentlichen die Bereitstellung von Versorgungs- und Bias-Spannungen, das Schreiben und Lesen von digitalen Datensignalen, die Messung von positiven und negativen Spannungen bzw. Strömen sowie ein definiertes Ein- und Ausschaltverhalten. Ziel ist es, dass vollständig entwickelte Baugruppen ähnlich dem Prinzip eines Baukastens in kürzester Zeit mühelos miteinander kombiniert werden können, um Demonstratoren für die unterschiedlichen Halbleiterchips zu erstellen. Ein erster Schritt umfasst die Festlegung der Anforderungen, gefolgt von der Entwurfsphase der einzelnen Baugruppen. Für eine messtechnische Untersuchung der Vielzahl an Konzepten wurde zunächst eine Versuchsleiterplatte entwickelt und produziert. Diese vereint alle im Rahmen dieser Forschungsarbeit entwickelten Konzepte und zeichnet sich durch eine große Anzahl an Konfigurationsmöglichkeiten aus. Auf diese Weise konnten sämtliche Schaltungskombinationen abgedeckt werden, was eine breite Vielfalt an Experimenten ermöglichte. In einem folgenden Schritt wurden die am besten geeigneten Baugruppen zur Erfüllung der gestellten Anforderungen anhand der Messergebnisse ermittelt. Abschließend kam der Baukasten zum Einsatz, um aus den entwickelten Konzepten die Demonstrator-Leiterplatte zur Ansteuerung des Arbiträrsignalgenerators zu erstellen. Abstract This work deals with the development of a compact and easy-to-use stand-alone setup for the control of an arbitrary waveform generator, which was developed at the Institute of Electrical and Optical Communications. The requirements for the printed circuit board were defined in universal valid way which also enables the control of all other semiconductor chips already developed at this institute. The functional requirements are basically the provision of supply voltage and bias voltages, the writing and reading of digital data signals, the measurement of positive and negative voltages or currents, and a defined switch-on and switch-off behaviour. In order to create demonstrator printed circuit boards for the different semiconductor chips, the aim is that completely developed building blocks of a modular system can effortlessly be combined with each other in a very short time. The first step involves defining the requirements, followed by the design phase for the corresponding building blocks. For a metrological investigation of the different concepts, a printed circuit board for tests was developed and produced. It combines all the concepts developed within the scope of this research work and is characterised by a large number of configuration options. This way, all circuit combinations could be covered, enabling a wide variety of experiments. In a subsequent step, the most suitable assemblies for fulfilling the set requirements were determined based on the measurement results. Finally, the building blocks were used to create the demonstrator printed circuit board for controlling the arbitrary waveform generator from the developed concepts.

Abstract

Abstract The application of the Petrov--Galerkin projection method in Cosserat rod finite element formulations offers significant advantages in simplifying the expressions within the discrete virtual work functionals. Moreover, it enables a straight-forward and systematic exchange of the ansatz functions, specifically for centerline positions and cross-section orientations. In this concise communication, we present a total Lagrangian finite element formulation for Cosserat rods that attempts to minimize the number of required theoretical concepts. The chosen discretization preserves objectivity and allows for large displacements/rotations and for large strains. The orientation parametrization with nonunit quaternions results in a singularity-free formulation.

Abstract

With the increasing amount of available and connected data sources, industrial automation applications such as condition monitoring of a production machine can be improved by considering various data. To gain insights from this data and make it useable, heterogeneous data has to be analyzed intensively. Limited machine learning approaches exist in industrial automation and manufacturing for analyzing data acquired from multiple sources. In this paper, first, a suitable concept for handling heterogeneous data from integration to analysis is presented as well as a multi-layer architecture for the concept’s realization. The architecture encapsulates functionalities into the different layers and allows easy extendability and modifiability. Afterwards, a context modeling approach for managing heterogeneous data and existing approaches and algorithms for analyzing this data robustly and dynamically analyzing it are presented.

Abstract

The demand for reconfigurations of production systems is increasing, driven by shorter innovation and product life cycles and economic volatility. Another trend in the domain of industrial automation is the emergence of cyber-physical production systems, which offer promising potentials, for example, self-organization capabilities. A suitable cyber-physical production system architecture that incorporates knowledge modelling and management concerns, plus a reconfiguration management methodology, is crucial for realizing self-organized reconfiguration management. In this paper, first reference architectures, architectural patterns, and basic principles, as well as knowledge modelling and management approaches, are discussed in general. Afterwards, these are examined concerning the reconfiguration management use case focusing on UML/XML-based and ontology-based approaches. A novel approach comprising a multi-agent system and the MAPE-K concept for reconfiguration management is presented. In addition, the approach contains a service-oriented architecture for a deterministic plant control within a layered architecture. The knowledge modelling is realized through a UML information model, which can be integrated into the system utilizing XML files. Furthermore, the provided tool support is described. It enables a user to describe system components in an effort-reduced manner and conform to the schema defined by the information model and its restrictions via a GUI.

Abstract

This paper presents an approach to combine multiple temperature-sensitive electrical parameters to improve the accuracy and precision of the junction temperature estimation of power transistors using the example of a silicon-carbide power MOSFET. Switching delays and the threshold voltage of the power transistor during turn-on and -off of a silicon-carbide power transistor are used as temperature-sensitive electrical parameters for the online junction temperature measurements. In order to improve the accuracy, a shallow fully-connected neural network is used as the means to combine the four measurements in one switching cycle of the transistor. The maximum measurement error of the junction temperature of the power transistor is reduced approximately 10-fold from 8.98 K to 0.92 K.

Abstract

Current industrial automation systems are facing increasing dynamics. Thus, acquiring and managing heterogeneous data within the Digital Twin to enable decision making is necessary although challenging. Knowledge Graphs unify and relate data, enabling the derivation of new insights. In this contribution, an approach for context-enriched modeling of cyber-physical production systems is proposed, in order to realize a Knowledge Graph enhanced intelligent Digital Twin further considering the context. Therefore, the modeling approach of the Knowledge Graph considers context and serves as a base for the graph embeddings to gain further knowledge about the production system. This knowledge is used within the architecture of the intelligent Digital Twin. The resulting benefits, i.e. diverse manifestations of an improved decision making, are highlighted by the use case of self-organized reconfiguration management.

Abstract

Protein misfolding and protein aggregation are causes of severe diseases as neurodegenerative disorders, diabetes and cancer. Therefore, the cell has to constantly monitor the folding status of its proteome. Chaperones and components of the ubiquitin-proteasome system are key players in the cellular protein quality control process. In order to characterize components of the protein quality control system in a well-established model eukaryote - the yeast Saccharomyces cerevisiae - we established new cytosolic model substrates based on firefly luciferase and (beta-isopropylmalate dehydrogenase (Leu2). The use of these two different enzymes arranged in tandem as reporters enabled us to analyse the folding status and the degradation propensity of these new model substrates in yeast cells mutated in components of the cellular protein quality control system. The Hsp70 chaperone system known to be essential in the cellular protein quality control was chosen as a model for showing the high value of the luciferase-based model substrates in the characterization of components of the cytosolic protein quality control system in yeast. (C) 2016 Elsevier Inc. All rights reserved.

Abstract

Most misfolded cytosolic proteins in the cell are eliminated by the ubiquitin-proteasome system. In yeast, polyubiquitination of misfolded cytosolic proteins is triggered mainly by the action of two ubiquitin ligases Ubr1, formerly discovered as recognition component of the N-end rule pathway, and the nuclear ubiquitin ligase San1. For San1-mediated targeting to proteasomal degradation, cytosolic proteins have to be imported into the nucleus. Selection of misfolded substrates for import into the nucleus had remained elusive. This study shows that an increasing molecular mass of substrates prevents nuclear San1-triggered proteasomal degradation but renders them susceptible to cytoplasmic Ubr1-triggered degradation.

Abstract

The doubly deprotonated bridging ligand L21- derived from 2,6-bis(2-pyridyl)-1,5-dihydro-1',4'-benzoquinono2',3'-d:5',6'-d'diimidazole H2L1 forms coordination compounds with two bis(2,2'-bipyridine)osmium(II) complex fragments in anti (1(ClO4)2) and syn configurations (2(ClO4)2) of (μ-L1)Os(bpy)22(ClO4)2, as evident from crystal structure analyses. Exchange of the metal-coordinating 2-pyridyl functions in the bridge through noncoordinating 4-tolyl substituents (L21- $\rightarrow$ L22-) leads to 3(ClO4)2 which involves chelation of the Os(bpy)22+ groups through imidazole-N and carbonyl-O atoms of the central p-quinone function. In addition to identification, the compounds were subjected to electrochem. (CV, DPV) and spectroelectrochem. (UV-visible-NIR, EPR) analyses of electron transfer, the results being supported by results from TD-DFT calculations Essential differences between 1n+/2n+ and 3n+ systems were found regarding variable but mostly metal centered oxidation, the two processes separated much more for 3n+. The 1st reduction is bpy (1+, 2+) or quinone ligand centered (3+). Electronic structures and electron transfer behavior are thus highly sensitive to differences of configuration and coordination.

Abstract

Krieg ist eines der zentralen Motive der ältesten schriftlichen Überlieferungen der Menschheitsgeschichte. Das systematische Nachdenken über diesen hat heute eine mindestens zweieinhalbtausendjährige Geschichte. Betrachten wir solche Erzählungen genauer - man könnte bei ausreichender Komplexität und Systematik solcher dann von Kriegstheorien sprechen - so fällt auf, dass der Krieg hier in völlig unterschiedlicher Gestalt erscheint, wobei das Bild jenes dabei in entscheidender Weise von der jeweils eingenommenen Perspektive auf diesen geprägt ist. Im Rahmen des Artikels soll eine im heutigen Diskurs weitgehend vergessene Betrachtungsweise des Krieges beleuchtet werden. Dieser widmet sich dabei sogenannten existenzialistischen Kriegsauffassungen deren Logik, Form und Argumentationsfiguren hier systematisch nachgezeichnet, dargestellt und exemplifiziert werden sollen. Ziel dessen ist es dabei ein überblickartiges Portrait solcher im sozialwissenschaftlichen Diskurs der Gegenwart kaum mehr präsenten existenzialistischen Kriegsauffassung zu zeichnen, um solche dadurch für den aktuellen Diskurs des Fachs sicht- und nutzbar zu machen.

Abstract

Bei der Berechnung der Seilnetztragwerke für die Überdachungen der Sportstätten für die Olympischen Spiele 1972 in München spielte ein bislang unveröffentlichtes und auch in Fachkreisen bislang weithin unbekanntes Manuskript des französischen Bauingenieurs Marc Biguenet, damals Mitarbeiter von Jörg Schlaich im Ingenieurbüro Leonhardt und Andrä, eine wesentliche Rolle. Es wird in zwei Veröffentlichungen von Klaus Linkwitz und Hans-Jörg Schek aus 1971 zur Berechnung und Formfindung von Seilnetztragwerken erwähnt und liefert wichtige Vorarbeiten. Das Manuskript war in Archiven und Bibliotheken allerdings nicht aufzufinden und wurde dem ersten Autor nach intensiven Recherchen schließlich von Marc Biguenet persönlich zur Verfügung gestellt. Im Rahmen dieses Berichts wird der Inhalt des Manuskripts mit dem Ziel der Quellen- und Wissenssicherung erstmals veröffentlicht, vergleichend kommentiert und in den technikhistorischen Kontext eingebettet. Die logisch-historischen Wurzeln der Berechnung von Seilnetztragwerken stehen im Zusammenhang mit der Entwicklungsgeschichte nichtlinearer baustatischer Theorien, dem Bau weitgespannter Hängebrücken sowie der Herausbildung computergestützter Berechnungsmethoden.

Abstract

This dataset contains two micro X-ray Computed Tomography (micro-XRCT) data sets from scans of the identical cylindrical sample (diameter 80 mm; unloaded height 80 mm) under different uniaxial compression loads. The sample consists of monodisperse soft (rubber) and stiff (glass) particles mixture. Both particles have an identical diameter of 4 mm. The volume fraction of the rubber particles is 30 %. The scan was performed in a low X-ray absorbing transparent oedometer cell with an integrated pair of P-wave ultrasonic transducers to determine in situ the sample stiffness based on wave propagation velocity measurements. On both sides, the wave travels through a 10 mm long Poly (methyl methacrylate) (PMMA) pre-run and after-run section, before and after the wave enters and leaves the sample.The prepared sample inside the oedometer cell was uniaxially compressed in axial direction in subsequent force increments from F_stat. = 200 N to F_stat. = 1000 N (force-controlled) using a Universal Testing Machine (UTM) integrated into the XRCT system. At each force level, the system was relaxed for some time at the defined force to compensate the creep behavior of the soft particles. Subsequently, ultrasonic wave propagation measurements were performed at five different load levels, F_stat. = 200, 400, 600, 800, 1000 N. micro-XRCT scans were acquired in situ at F_stat. = 400, 800 N. For this, it was switched from force-controlled to displacement-controlled to avoid creeping and an eventual movement of the particles during the imaging. In this data set, the reconstructed 3d volumes ("mixture_nu0.3_F400N_reconstructed.tar.gz" and "mixture_nu0.3_F800N_reconstructed.tar.gz"), as well as the projection images ("mixture_nu0.3_F400N_projections.tar.gz" and "mixture_nu0.3_F800N_projections.tar.gz") for both preloads are given. The raw ultrasonic measurement data (transducer signals over time) is provided for all five preloads ("mixture_nu0.3_ultrasonic_data.tar.gz"), before and after the force-controlled relaxation, as an averaged signal of a stack of 32 signals. The file "mixture_nu0.3_utm_data.csv" contains the measured axial force and displacement from the UTM during the whole experiment. Based on the measured displacement of the UTM, the current mixture length was determined. In the file “mixture_nu0.3_P-wave_moduli.csv” the final calculated P-wave moduli for the different preload levels are contained.

Abstract

Failure analysis is essential for improving the reliability and manufacturability of electronic devices. With the time-domain reflectometry method, failures can be analyzed non-destructively. The method enables the detection, location, and characterization of hard interconnection failures (open or shorts) as well as of soft interconnection failures, which can give an outlook on imminent hard failures. Generating measurement data from real failed devices is costly since failed devices need to be selected and the measurements need to be performed and prepared. In contrast, simulation models are often available where all possible kinds of failures can be created. Therefore, we propose simulation to real transfer learning for the failure analysis on time-domain reflectometry data. A deep learning model shall first be trained on time-domain reflectometry simulation data and then be transferred to measurement data of a power transistor. We investigate different possibilities of transfer and evaluate the performance of a SiC power transistor.