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- Fachbereich Wirtschaftswissenschaften (89)
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- 2022 (365) (remove)
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Sensoren können verschiedene Aufgaben erfüllen, wie beispielsweise die Optimierung von Prozessen, die Interaktion zwischen Geräten oder die Verbesserung der zivilen Sicherheit. [1–3] Ihr Bedarf für die Industrie oder den Alltag wächst seit Jahren stetig. Besonders mobile Gassensoren sind von großem Interesse. Jedoch ist ihre Anwendung meist durch ihre integrierte Batterie begrenzt. Gassensoren ohne oder mit einem nur sehr geringen Energieverbrauch stehen daher im Interesse bei neuen Anwendungsgebieten, beispielsweise im Brandschutz oder in der Textilindustrie. [4,5] Die Sensoren könnten zum Beispiel in die Textilien einer persönlichen Schutzausrüstung eingearbeitet werden und durch einen Farbumschlag die Anwesenheit eines Gases oder die Überschreitung des Grenzwertes toxischer Substanzen anzeigen.
Digitalisierung in zentralen Feldern der Sozialpolitik: Entwicklungstendenzen, Chancen und Risiken
(2022)
Mobiles Laser-Schneidsystem zur Unterstützung der USBV-Entschärfung und Beweissicherung (mobiLaS)
(2022)
Robots applied in therapeutic scenarios, for instance in the therapy of individuals with Autism Spectrum Disorder, are sometimes used for imitation learning activities in which a person needs to repeat motions by the robot. To simplify the task of incorporating new types of motions that a robot can perform, it is desirable that the robot has the ability to learn motions by observing demonstrations from a human, such as a therapist. In this paper, we investigate an approach for acquiring motions from skeleton observations of a human, which are collected by a robot-centric RGB-D camera. Given a sequence of observations of various joints, the joint positions are mapped to match the configuration of a robot before being executed by a PID position controller. We evaluate the method, in particular the reproduction error, by performing a study with QTrobot in which the robot acquired different upper-body dance moves from multiple participants. The results indicate the method's overall feasibility, but also indicate that the reproduction quality is affected by noise in the skeleton observations.
Während sich die unternehmerische Arbeitswelt immer mehr in Richtung Agilität verschiebt, verharrt das IT-Controlling noch in alten, klassischen Strukturen. Diese Arbeit untersucht die Fragestellung, ob und inwieweit agile Ansätze im IT-Controlling eingesetzt werden können. Dieser Beitrag ist eine modifizierte Version des in der Zeitschrift „HMD Praxis der Wirtschaftsinformatik“ (https://link.springer.com/article/10.1365/s40702-022-00837-0) erschienenen Artikels „Agiles IT-Controlling“.
Entrepreneurial Leadership
(2022)
Start-ups und Unternehmensgründungen ebenso wie Projekt- oder Innovationsmanagement brauchen gleichermaßen neben dem einschlägigen Fachwissen und -erfahrungen Leadership-Skills als Erweiterung klassischer Managementanforderungen. Während diese prozessorientiert konkrete Ziele der strategischen oder operativen Planung umsetzen und optimieren, legt Leadership wie Entrepreneurship den Fokus auf Vision mit entsprechender Motivation zur Gründung oder Veränderung. (Verlagsangaben)
Wie KI Innere Führung lernt
(2022)
Dass sich künstliche Intelligenz (KI) weltweit ausgebreitet hat, ist eine Binsenwahrheit. Die rasche und unaufhaltsame Proliferation von KI der letzten zehn Jahre spricht für sich, und längst ziehen auch Gesetzgeber und Regulierungsbehörden nach, um KI und ihre Technikfolgen einzuhegen. Für Deutschland relevante Gestaltungsanforderungen haben die High-Level Expert Group on Artificial Intelligence der Europäischen Kommission (HLEG AI) und auf nationaler Ebene die Datenethikkommission der Bundesregierung (DEK) und die Enquetekommission Künstliche Intelligenz des Deutschen Bundestags (EKKI) geäußert.
P30 - Das Elektrospinnen von halbleitenden Zinndioxidfasern für die Detektion von Wasserstoff
(2022)
Das Ziel dieser Arbeit ist die Entwicklung von dünnen keramischen Fasern als halbleitendes Sensormaterial zum Nachweis von Wasserstoff, möglichst bei Zimmertemperatur. Die elektrische Leitfähigkeit halbleitender Metalloxide ändert sich durch die Einwirkung von oxidierenden und reduzierenden Gasen auf die Oberfläche des Metalloxids. Dieser Effekt kann zur Messung der Gaskonzentration genutzt werden. Die Reaktion von Zinn(IV)-oxid mit Wasserstoff basiert auf der Reduktion des Zinn(IV)-oxids zum Zinn, wobei die Elektronen des Zinn(IV)-oxids im metallischen Zinn verbleiben und dort im nicht gebundenen Zustand zu einer Leitfähigkeitserhöhung beitragen. Die Reaktion des Wasserstoffes kann sowohl mit den Sauerstoffatomen des Oxids als auch mit adsorbierten Sauerstoffatomen an der Oxidoberfläche stattfinden.[ 6] Da die Reaktionen an der Oberfläche des Oxids stattfinden, sollten Sensoren mit einer großen Oberfläche im Vergleich zu metalloxidischen Bulkmaterialien eine höhere Empfindlichkeit aufweisen. [3] Die Verwendung von Fasern anstelle von Dünn- oder Dickschichten führt dabei zu einer besseren Sensitivität gegenüber Gasen.
Using a life-cycle approach, we identify key gaps for social reform in Georgia. The reduction of informal work is the most pressing of these, since formal employment is the backbone of any robust and reliable social insurance scheme. At the same time, greater financial resources are required through taxation in order to enable systematic social reform in Georgia. Both interventions are needed in order to fill the gaps in the current social protection system, which include the limited scope of pension and health insurance, as well as the lack of permanent unemployment insurance and universal child benefits.
Against the background of Germany’s long experience with social protection, we outline the main principles of the German welfare state and present the design of three main social insurance branches (pensions, health and unemployment). Based on the mixed experience that has emerged in Germany, in particular due to path dependencies and political deadlock, we derive lessons that inform a clear and coherent vision for social reform in Georgia.
In recent years, the ability of intelligent systems to be understood by developers and users has received growing attention. This holds in particular for social robots, which are supposed to act autonomously in the vicinity of human users and are known to raise peculiar, often unrealistic attributions and expectations. However, explainable models that, on the one hand, allow a robot to generate lively and autonomous behavior and, on the other, enable it to provide human-compatible explanations for this behavior are missing. In order to develop such a self-explaining autonomous social robot, we have equipped a robot with own needs that autonomously trigger intentions and proactive behavior, and form the basis for understandable self-explanations. Previous research has shown that undesirable robot behavior is rated more positively after receiving an explanation. We thus aim to equip a social robot with the capability to automatically generate verbal explanations of its own behavior, by tracing its internal decision-making routes. The goal is to generate social robot behavior in a way that is generally interpretable, and therefore explainable on a socio-behavioral level increasing users' understanding of the robot's behavior. In this article, we present a social robot interaction architecture, designed to autonomously generate social behavior and self-explanations. We set out requirements for explainable behavior generation architectures and propose a socio-interactive framework for behavior explanations in social human-robot interactions that enables explaining and elaborating according to users' needs for explanation that emerge within an interaction. Consequently, we introduce an interactive explanation dialog flow concept that incorporates empirically validated explanation types. These concepts are realized within the interaction architecture of a social robot, and integrated with its dialog processing modules. We present the components of this interaction architecture and explain their integration to autonomously generate social behaviors as well as verbal self-explanations. Lastly, we report results from a qualitative evaluation of a working prototype in a laboratory setting, showing that (1) the robot is able to autonomously generate naturalistic social behavior, and (2) the robot is able to verbally self-explain its behavior to the user in line with users' requests.
Introduction. The experience of pain is regularly accompanied by facial expressions. The gold standard for analyzing these facial expressions is the Facial Action Coding System (FACS), which provides so-called action units (AUs) as parametrical indicators of facial muscular activity. Particular combinations of AUs have appeared to be pain-indicative. The manual coding of AUs is, however, too time- and labor-intensive in clinical practice. New developments in automatic facial expression analysis have promised to enable automatic detection of AUs, which might be used for pain detection. Objective. Our aim is to compare manual with automatic AU coding of facial expressions of pain. Methods. FaceReader7 was used for automatic AU detection. We compared the performance of FaceReader7 using videos of 40 participants (20 younger with a mean age of 25.7 years and 20 older with a mean age of 52.1 years) undergoing experimentally induced heat pain to manually coded AUs as gold standard labeling. Percentages of correctly and falsely classified AUs were calculated, and we computed as indicators of congruency, "sensitivity/recall," "precision," and "overall agreement (F1)." Results. The automatic coding of AUs only showed poor to moderate outcomes regarding sensitivity/recall, precision, and F1. The congruency was better for younger compared to older faces and was better for pain-indicative AUs compared to other AUs. Conclusion. At the moment, automatic analyses of genuine facial expressions of pain may qualify at best as semiautomatic systems, which require further validation by human observers before they can be used to validly assess facial expressions of pain.
The aim of this master thesis was to probe the view of Bonn’s citizens on the smart city project of the German city. A literature review helped defining the smart city term and identifying the smart city concept that is mostly used in Germany. This can be summarized as an urban planning concept using information and communication technology to build citizen centric, sustainable cities. According to this, a smart city should include transparent communication and participation of its citizens. The websites and different publications of Bonn were researched to understand its smart city strategy and vision. This revealed inconsistencies. To resolve these inconsistencies, three representatives of the city were inter-viewed. Based on the knowledge gained up to this point, two groups of Bonn’s inhabitants discussed the Smart City Bonn and presented their perception of it. With the help of this methodology, the following results were obtained. Communication and participation of the city are in many cases in line with the current recommendations for a smart city. Bonn has apparently recognized the relevance of these aspects in theory but should also implement them more consistently in practice. Currently the city council publishes contradictory information and does not plan to incorporate the sight of Bonn’s citizens to develop the smart city strat-egy in the first place, as it is recommended in common literature.
IT-Governance, Prüfung & Revision mal agil gedacht! Herausforderungen und Notwendigkeit eines Perspektivwechsels für IT-Governance, Prüfung & Revision viele Fallbeispiele zeigen die praktische Umsetzbarkeit auf Agilität und der Einsatz agiler Methoden sind heute nicht mehr nur auf IT-Projekte begrenzt, sondern prägen zunehmend ganze Organisationen. Dieses Buch zeigt auf, wie sich IT-Governance, Prüfung & Revision erfolgreich dem durch Agilität ausgelösten Wandel stellen können und wie sich der Umgang mit den Kernthemen Risiko & Unsicherheit verändert. Zum einen werden Ansätze für eine agile IT-Governance und eine agile Prüfung & Revision beschrieben, indem sie sich agile Werte und Vorgehensweisen zu eigen machen. Zum anderen werden IT-Governance, Prüfung & Revision befähigt, agile Projekte angemessen steuern und wirksam prüfen zu können.
Trojanized software packages used in software supply chain attacks constitute an emerging threat. Unfortunately, there is still a lack of scalable approaches that allow automated and timely detection of malicious software packages and thus most detections are based on manual labor and expertise. However, it has been observed that most attack campaigns comprise multiple packages that share the same or similar malicious code. We leverage that fact to automatically reproduce manually identified clusters of known malicious packages that have been used in real world attacks, thus, reducing the need for expert knowledge and manual inspection. Our approach, AST Clustering using MCL to mimic Expertise (ACME), yields promising results with a 𝐹1 score of 0.99. Signatures are automatically generated based on characteristic code fragments from clusters and are subsequently used to scan the whole npm registry for unreported malicious packages. We are able to identify and report six malicious packages that have been removed from npm consequentially. Therefore, our approach can support the detection by reducing manual labor and hence may be employed by maintainers of package repositories to detect possible software supply chain attacks through trojanized software packages.
Guzzo et al. (Reference Guzzo, Schneider and Nalbantian2022) argue that open science practices may marginalize inductive and abductive research and preclude leveraging big data for scientific research. We share their assessment that the hypothetico-deductive paradigm has limitations (see also Staw, Reference Staw2016) and that big data provide grand opportunities (see also Oswald et al., Reference Oswald, Behrend, Putka and Sinar2020). However, we arrive at very different conclusions. Rather than opposing open science practices that build on a hypothetico-deductive paradigm, we should take initiative to do open science in a way compatible with the very nature of our discipline, namely by incorporating ambiguity and inductive decision-making. In this commentary, we (a) argue that inductive elements are necessary for research in naturalistic field settings across different stages of the research process, (b) discuss some misconceptions of open science practices that hide or discourage inductive elements, and (c) propose that field researchers can take ownership of open science in a way that embraces ambiguity and induction. We use an example research study to illustrate our points.
Digitaltechnik
(2022)
Moderne Digitaltechnik, umfassend und kompakt: Dieses Lehr- und Übungsbuch spannt den Bogen von den Grundlagen der Digitaltechnik über den Entwurf mit VHDL und Komponenten digitaler Systeme bis zu modernen Mikrocontrollern der STM32-Serie.
Die 8. Auflage wurde aktualisiert und die Themenbereiche Mikroprozessoren und Mikrocontroller grundlegend überarbeitet.
Einleitung
(2022)
Buch-Diskurse
(2022)
Vorwort
(2022)
Medien-›Eingriffe‹
(2022)
Was ist ein Labor?
(2022)
Vorwort
(2022)
Harald Schmidt
(2022)
Als Medien- und insbesondere Fernsehphänomen hat Harald Schmidt die TV-Kultur im deutschsprachigen Raum maßgeblich beeinflusst. So ist es etwa der Harald Schmidt Show gelungen, halbironische Sprechweisen diskursfähig zu machen, die sich bis in die Gegenwart der Social Media verfolgen lassen. Die Beiträger*innen des Bandes untersuchen vor diesem Hintergrund die »Methode Harald Schmidt«, d.h. die Unterminierung gängiger sozialer Vorstellungen bei gleichzeitiger Affirmation derselben. Die zentrale These lautet: Harald Schmidt hat grundlegende Voraussetzungen dafür geschaffen, eine weitestgehend neue Populärkultur ästhetisch wie kulturpraktisch zu etablieren.
Buch-Aisthesis
(2022)
Literatur kann auch als Verbund von Medien betrachtet werden, die in Kooperations- und Konkurrenzverhältnissen auftreten. Dies wird umso deutlicher, wenn aus literatur- und designwissenschaftlicher Perspektive auf die Beobachtung der Differenz von typographischen und anderen, grundsätzlich nonverbalen visuellen Daten abgestellt wird. Die Beiträger*innen des Bandes leiten daraus ein Verhältnis von Literatur- und Kunstwissenschaft zu ihren Gegenständen ab, das nicht zuletzt zu einer neuen Aufmerksamkeit für die skripturale und typographische Materialität und Medialität der Literatur führt. Dabei geht es um die Theorie der Reflexion und die Praxis der Erzeugung einer je spezifischen Buch-Ästhetik.
Technik-Ästhetik
(2022)
Von Technik und Ästhetik zu sprechen, heißt, sich bereits begrifflich auf ein Feld einzulassen, das mindestens zwei divergente Perspektiven gemeinsam denkt. Dabei haben das Technische wie das Ästhetische die Bedeutung einer Interdependenz aufzuweisen: Das Technische konstituiert einerseits Funktionen, Formen und Gebrauchsaspekte - ästhetische Zustände evozieren andererseits zeichenhafte Realisierungen, phantasmatische Urteile und wahrnehmungsvermittelte Phänomene des Erscheinens. Die Beiträger*innen des Bandes zeigen, wie bei der Konfrontation von Technik und Ästhetik eine Art Verkopplung und intrinsische Dynamik qua techno-ästhetischer Evokation entstehen kann.
Thermo-chemical conversion of cucumber peel waste for biobased energy and chemical production
(2022)
The human enzymes GLYAT (glycine N-acyltransferase), GLYATL1 (glutamine N-phenylacetyltransferase) and GLYATL2 (glycine N-acyltransferase-like protein 2) are not only important in the detoxification of xenobiotics via the human liver, but are also involved in the elimination of acyl residues that accumulate in the form of their coenzyme A (coA) esters in some rare inborn errors of metabolism. This concerns, for example, disorders in the degradation of branched-chain amino acids, such as isovaleric acidemia or propionic acidemia. In addition, they also assist in the elimination of ammonium, which is produced during the transamination of amino acids and accumulates in urea cycle defects. Sequence variants of the enzymes have also been investigated, which may provide evidence of impaired enzyme activities, from which therapy adjustments can potentially be derived. A modified Escherichia coli strain was chosen for the overexpression and partial biochemical characterization of the enzymes, which may allow solubility and proper folding. Since post-translational protein modifications are very limited in bacteria, we also attempted to overexpress the enzymes in HEK293 cells (human-derived). In addition to characterization via immunoblots and activity assays, intracellular localization of the enzymes was also performed using GFP coupling and confocal laser scanning microscopy in transfected HEK293 cells. The GLYATL2 enzyme may have tasks beyond detoxification and metabolic defects and the preliminary molecular biology work has been performed as part of this project - the enzyme activity determinations were outsourced to a co-supervised bachelor thesis. The enzyme activity determinations with purified recombinant human enzyme from Escherichia coli provided a threefold higher activity of the sequence variant p.(Asn156Ser) for GLYAT, which should be considered as the probably authentic wild type of the enzyme. In addition, a reduced activity of the GLYAT variant p.(Gln61Leu), which is very common in South Africa, was shown, which could be of particular importance in the treatment of isovaleric acidemia, which is also common in South Africa. Intracellularly, GLYAT and GLYATL1 could be localized mitochondrially. As the analyses have shown, sequence variations of GLYAT and GLYATL1 influence their enzyme activity. As an example, the GLYAT variant p.(Gln61Leu) is frequently found in South Africa. In the case of reduced GLYAT activity, patients could be increasingly treated with L-carnitine in the sense of an individualized therapy, since the conjugation of the toxic isovaleryl-coA with glycine is restricted by the GLYAT sequence variation. Activity-reducing variants identified in this project are of particular interest, as they may influence the treatment of certain metabolic defects.
State-of-the-art object detectors are treated as black boxes due to their highly non-linear internal computations. Even with unprecedented advancements in detector performance, the inability to explain how their outputs are generated limits their use in safety-critical applications. Previous work fails to produce explanations for both bounding box and classification decisions, and generally make individual explanations for various detectors. In this paper, we propose an open-source Detector Explanation Toolkit (DExT) which implements the proposed approach to generate a holistic explanation for all detector decisions using certain gradient-based explanation methods. We suggests various multi-object visualization methods to merge the explanations of multiple objects detected in an image as well as the corresponding detections in a single image. The quantitative evaluation show that the Single Shot MultiBox Detector (SSD) is more faithfully explained compared to other detectors regardless of the explanation methods. Both quantitative and human-centric evaluations identify that SmoothGrad with Guided Backpropagation (GBP) provides more trustworthy explanations among selected methods across all detectors. We expect that DExT will motivate practitioners to evaluate object detectors from the interpretability perspective by explaining both bounding box and classification decisions.
21 pages, with supplementary
Bonding wires made of aluminum are the most used materials for the transmission of electrical signals in power electronic devices. During operation, different cyclic mechanical and thermal stresses can lead to fatigue loads and a failure of the bonding wires. A prediction or prevention of the wire failure is not yet possible by design for all cases. The following work presents meaningful fatigue tests in small wire dimensions and investigates the influence of the R-ratio on the lifetime of two different aluminum wires with a diameter of 300 μm each. The experiments show very reproducible fatigue results with ductile failure behavior. The endurable stress amplitude decreases linearly with an increasing stress ratio, which can be displayed by a Smith diagram, even though the applied maximum stresses exceed the initial yield stresses determined by tensile tests. A scaling of the fatigue results by the tensile strength indicates that the fatigue level is significantly influenced by the strength of the material. Due to the very consistent findings, the development of a generalized fatigue model for predicting the lifetime of bonding wires with an arbitrary loading situation seems to be possible and will be further investigated.
In young adulthood, important foundations are laid for health later in life. Hence, more attention should be paid to the health measures concerning students. A research field that is relevant to health but hitherto somewhat neglected in the student context is the phenomenon of presenteeism. Presenteeism refers to working despite illness and is associated with negative health and work-related effects. The study attempts to bridge the research gap regarding students and examines the effects of and reasons for this behavior. The consequences of digital learning on presenteeism behavior are moreover considered. A student survey (N = 1036) and qualitative interviews (N = 11) were conducted. The results of the quantitative study show significant negative relationships between presenteeism and health status, well-being, and ability to study. An increased experience of stress and a low level of detachment as characteristics of digital learning also show significant relationships with presenteeism. The qualitative interviews highlighted the aspect of not wanting to miss anything as the most important reason for presenteeism. The results provide useful insights for developing countermeasures to be easily integrated into university life, such as establishing fixed learning partners or the use of additional digital learning material.
In this paper, modeling of piston and generic type gas compressors for a globally convergent algorithm for solving stationary gas transport problems is carried out. A theoretical analysis of the simulation stability, its practical implementation and verification of convergence on a realistic gas network have been carried out. The relevance of the paper for the topics of the conference is defined by a significance of gas transport networks as an advanced application of simulation and modeling, including the development of novel mathematical and numerical algorithms and methods.