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In this thesis we examined the question whether personality traits of early child care workers influence process quality in preschool.
Research has shown that in educational settings such as preschool, pedagogical quality affects children’s developmental outcome (e.g. NICHD, 2002; Peisner-Feinberg et al., 1999). A substantial part of pedagogical quality known to be vital in this respect is the interaction between teacher and children (e.g., Tietze, 2008). Results of prior classroom research indicate that the teachers’ personality might be an important factor for good teacher-child-interaction (Mayr, 2011). Thus, personality traits might play a vital role for the interaction in preschool. Therefore, the aims of this thesis were to a) identify pivotal personality traits of child care workers, b) assess ideal levels of the identified personality traits and c) examine the relationship between pivotal personality traits and process quality. On that account, we conducted two requirement analyses and a video study. The results of these studies showed that subject matter experts (parents, child care workers, lecturers) partly agreed as to which personality traits are pivotal for child care workers. Furthermore, the experts showed high consensus with regard to the minimum, ideal and maximum personality trait profiles. Furthermore, child care workers whose profiles lay closer to the experts’ ideal also showed higher process quality. In addition, regression analyses showed that the child care workers’ levels of the Big Two (Communion and Agency) related significantly to their process quality.
In Western personnel psychology, competence- and control beliefs (CCB) are of widespread use to predict typical work-related outcomes such as well-being, achievement motivation and job performance. The predictive value and comprehension of CCB in East Africa is examined, comparing a Kenyan target with a German source sample (N=143). Responses to personality tests included qualitative interviews on items capturing control orientations (self concept of ability, internality, powerful others, and chance). Linear regression analyses,
explorative factor analyses, and a procrustean target rotation showed comparable, but not fully congruent predictability for the connection of CCB with outcome variables. Factor structures of control responses did not resemble each other sufficiently. Content analyses including scale intercorrelations, quantitative and qualitative item information served for an explanation of this predictability gap, specifying differences between the German and Kenyan samples that are associated with the social-relational domain of personality. Results
fit in the picture depicted by the African Ubuntu philosophy and the South African Personality Inventory project (SAPI), both emphasizing social-relational aspects. In particular, the powerful others control orientation diverges the most between the cultures. Being perceived as a negative and external factor in the German sample with its individualistic culture, powerful others is of mixed emotional quality and just as well internal, when asked for in the Kenyan sample with its Ubuntu-worldview. An uncritical transfer of CCB measures from one culture to another is assumed to be inappropriate. More emic-etic based research is demanded concerning intra- and intercultural variability of CCB to depict a
transcultural applicable model.
The history of human kind is characterized by social conflict. Every conflict can be the starting point of social change or the escalation into more destructive forms. The social conflict in regard to rising numbers of refugees and their acceptance that arose in most host countries in 2015 already took on destructive forms – in Germany, right-wing extremists attacked refugee shelters and even killed multiple people, including political leaders who openly supported refugees. Thus, incompatible expectancies and values of different parts of the society led to violent action tendencies, which tremendously threaten intergroup relations. Psychological research has developed several interventions in past decades to improve intergroup relations, but they fall short, for example, when it comes to the inclusion of people with extreme attitudes and to precisely differentiate potential prosocial outcomes of the interventions. Thus, this dissertation aimed to a) develop psychological interventions, that could also be applied to people with more extreme attitudes, thereby putting a special emphasis on collecting a diverse sample; b) gain knowledge about target- and outcome specific effects: Who benefits from which intervention and how can specific prosocial actions be predicted in order to develop interventions that guide needs-based actions; and c) shed light on potential underlying mechanisms of the interventions.
The dissertation will be introduced by the socio-political background that motivated the line of research pursued, before providing an overview of the conceptualization of social conflicts and potential psychological inhibitors and catalyzers for conflict transformation. Based on past research on socio-psychological interventions and their limitations, the aims of the dissertation will be presented in more detail, followed by a short summary of each manuscript. Overall, the present thesis comprises four manuscripts that were summarized in the general discussion into a road map for social-psychological interventions to put them into a broader perspective. The road map aspires to provide recommendations for increasing – either approach-oriented or support-oriented actions – by the socio-psychological interventions for a variety of host society groups depending on their pre-existing attitude towards refugees.
A Paradoxical Intervention targeting central beliefs of people with negative attitudes towards refugees influenced inhibitory and catalyzing factors for conflict transformation over the course of three experiments – thereby providing an effective tool to establish approach-oriented action tendencies, such as the willingness to get in contact with refugees. Further, the dissertation presents a novel mechanism – namely Cognitive Flexibility – which could explain the Paradoxical Interventions’ effect of past research. By positively affecting a context-free mindset, the Paradoxical Intervention could impact more flexible thought processes in general, irrespective of the topic tackled in the Paradoxical Intervention itself. For people with rather positive attitudes addressing emotions may increase specific support-oriented action tendencies. The dissertation provides evidence of a positive relation between moral outrage and hierarchy-challenging actions, such as solidarity-based collective action, and sympathy with prosocial hierarchy-maintaining support-oriented actions, such as dependency-oriented helping. These exclusive relations between specific emotions and action intentions provide important implications for the theorizing of emotion-behavior relations, as well as for practical considerations. In addition, a diversity workshop conducted with future diplomats showed indirect effects on solidarity-based collective action via diversity perception and superordinate group identification, thereby extending past research by including action intentions and going beyond the focus on grassroot-initiatives by presenting an implementable intervention for future leaders in a real world context.
Taken together, this dissertation provides important insights for the development of socio-psychological interventions. By integrating a diverse sample, including members of institutions on meso- and macro-levels (non-governmental organizations and future politicians) of our society, this dissertation presents a unique multi-perspective of host society members on the social conflict of refugee acceptance and support. Thereby, this work contributes to theoretical and practical advancement of how social psychology can contribute not only to negative peace – by for example (indirectly) reducing support of violence against refugees – but also to positive peace – by for example investigating precursors of hierarchy-challenging actions that enable equal rights.
Das Interesse am Konzept Crowdfunding ist in den letzten Jahren sowohl aus der Wirtschaft als auch aus der Wissenschaft gestiegen. Neben Künstlern und Entrepreneuren finanzieren nun auch Wissenschaftler ihre Projekte durch zahlreiche kleine Beiträge aus der Crowd. Allerdings spiegelt die wahrgenommene Nutzung in Deutschland nicht die Vorteile einer Crowdfunding-Kampagne wider, insbesondere nicht im internationalen Vergleich. Die vorliegende Studie untersucht diesen Umstand, indem sie die Motive und Barrieren für eine Finanzierung durch Crowdfunding identifiziert, um Empfehlungen für Forschungseinrichtungen zur Förderung von Crowdfunding zu formulieren. Durch eine Literaturanalyse werden erste Erkenntnisse ermittelt, welche dann für die Durchführung von qualitativen Interviews mit elf Wissenschaftlern, die bereits eine Crowdfunding-Kampagne erfolgreich abgeschlossen haben, verwendet werden. Die Ergebnisse zeigen, dass ForscherInnen in Deutschland Crowdfunding in erster Linie dazu verwenden, Aufmerksamkeit für das Thema und die wissenschaftliche Gemeinschaft im Allgemeinen zu schaffen. Die größten Barrieren sind der enorme Aufwand, der mit einer Kampagne verbunden ist, und die mangelnde Reputation des Konzepts des Crowdfunding seitens der deutschen Wissenschaft. Zudem eignen sich nur Themen und Projekte mit einer hohen Öffentlichkeitswirksamkeit und einem Fördervolumen von maximal fünfstelligen Beträgen. Darüber hinaus konnte die öffentliche Wahrnehmung der Experten während der Kampagne als zusätzliche Barriere identifiziert werden.
Diese Ergebnisse führen zu drei Empfehlungen für Forschungseinrichtungen zur Förderung von Crowdfunding: Es wird empfohlen das Bewusstsein für das Thema Crowdfunding als zusätzliche Form der Forschungsfinanzierung zu sensibilisieren und die Vorteile einer Crowdfunding-Kampagne hervorzuheben. Universitäten sollten mit Crowdfunding Akteuren (bspw. Plattformen und Experten) zusammenarbeiten und die Netzwerkeffekte einer Universität sollten genutzt werden. Die Universitäten sollten Unterstützung leisten, um die Arbeitsbelastung auf interdisziplinäre Teams zu verteilen, um so das Verhältnis zwischen Aufwand und Ertrag zu optimieren. Die gewählte Methodik und der Geltungsbereich der Thesis eröffnen weitere Forschungsmöglichkeiten, die die Perspektive der Universitäten und die Bedingungen in anderen Ländern untersuchen könnten. Darüber hinaus ist eine groß angelegte quantitative Studie erforderlich, um die identifizierten Konzepte statistisch zu validieren.
Social-Media Plattformen wie Twitter oder Reddit bieten Nutzern nahezu ohne Beschränkungen die Möglichkeit, ihre Meinungen über aktuelle Ereignisse zu veröffentlichen, diese mit anderen zu teilen und darüber zu diskutieren. Während die Mehrheit der Nutzer diese Plattformen nur als reines Diskussionsportal verwenden, gibt es jedoch Nutzergruppen, welche aktiv und gezielt versuchen, diese veröffentlichten Meinungen in ihrem Sinne zu beeinflussen bzw. zu manipulieren. Durch wiederholtes Verbreiten von bearbeiteten Fake-News oder stark polarisierenden Meinungen im gesamten politischen Spektrum können andere Nutzer beeinflusst, manipuliert und unter Umständen zum Träger von Hassreden und extremen politischen Positionen werden. Viele dieser Nutzergruppen sind vor allem in englischsprachigen Portalen anzutreffen, in denen sie sich überwiegend als Muttersprachler ausgeben. In dieser Arbeit stellen wir eine Methode vor, englische Muttersprachler und Nicht-Muttersprachler, die Englisch als Fremdsprache verwenden, anhand von ausgewählten englischen Social Media Texten zu unterscheiden. Dazu implementieren wir textmerkmalbasierte Modelle, welche für traditionelle Machine-Learning Prozesse und neuartigen AutoML-Pipelines zur Klassifizierung von Texten verwendet werden. Wir klassifizieren dabei Sprachfamilie, Muttersprache und Ursprung eines beliebigen englischen Textes. Die Modelle werden an einem bestehenden Datensatz von Reddit, welcher hauptsächlich aus englischen Texten von europäischen Nutzern besteht, und einem neu erstellten Twitter Datensatz, der Tweets von aktuellen Themen in verschiedenen Ländern enthält, angewandt. Wir evaluieren dabei vergleichsweise die erhaltenen Resultate unserer Pipeline zu traditionellen Maschinenlernprozessen zur Texterkennung anhand von Präzision, Genauigkeit und F1-Maßen der Vorhersagen. Wir vergleichen zudem die Ergebnisse auf Unterschiede der Sprachnutzung auf den unterschiedlichen Plattformen sowie den ausgewählten Themenbereichen. Dabei erzielen wir eine hohe Vorhersagewahrscheinlichkeit für alle gewählten Kategorien des erstellten Twitter Datensatzes und stellen unter anderem eine hohe Abweichung in Bezug auf die durchschnittliche Textlänge insbesondere bei Nutzern aus dem baltoslawischen Sprachraum fest.
Initial goal of the current dissertation was the determination of image-based biomarkers sensitive for neurodegenerative processes in the human brain. One such process is the demyelination of neural cells characteristic for Multiple sclerosis (MS) - the most common neurological disease in young adults for which there is no cure yet. Conventional MRI techniques are very effective in localizing areas of brain tissue damage and are thus a reliable tool for the initial MS diagnosis. However, a mismatch between the clinical fndings and the visualized areas of damage is observed, which renders the use of the standard MRI diffcult for the objective disease monitoring and therapy evaluation. To address this problem, a novel algorithm for the fast mapping of myelin water content using standard multiecho gradient echo acquisitions of the human brain is developed in the current work. The method extents a previously published approach for the simultaneous measurement of brain T1, T∗ 2 and total water content. Employing the multiexponential T∗ 2 decay signal of myelinated tissue, myelin water content is measured based on the quantifcation of two water pools (myelin water and rest) with different relaxation times. Whole brain in vivo myelin water content maps are acquired in 10 healthy controls and one subject with MS. The in vivo results obtained are consistent with previous reports. The acquired quantitative data have a high potential in the context of MS. However, the parameters estimated in a multiparametric acquisition are correlated and constitute therefore an ill-posed, nontrivial data analysis problem. Motivated by this specific problem, a new data clustering approach is developed called Nuclear Potential Clustering, NPC. It is suitable for the explorative analysis of arbitrary dimensional and possibly correlated data without a priori assumptions about its structure. The developed algorithm is based on a concept adapted from nuclear physics. To partition the data, the dynamic behavior of electrically even charged nucleons interacting in a d-dimensional feature space is modeled. An adaptive nuclear potential, comprised of a short-range attractive (Strong interaction) and a long-range repulsive term (Coulomb potential), is assigned to each data point. Thus, nucleons that are densely distributed in space fuse to build nuclei (clusters), whereas single point clusters are repelled (noise). The algorithm is optimized and tested in an extensive study with a series of synthetic datasets as well as the Iris data. The results show that it can robustly identify clusters even when complex configurations and noise are present. Finally, to address the initial goal, quantitative MRI data of 42 patients are analyzed employing NPC. A series of experiments with different sets of image-based features show a consistent grouping tendency: younger patients with low disease grade are recognized as cohesive clusters, while those of higher age and impairment are recognized as outliers. This allows for the definition of a reference region in a feature space associated with phenotypic data. Tracking of the individual's positions therein can disclose patients at risk and be employed for therapy evaluation.
Bäche gehören zu den gefährdetsten Ökosystemen, da sie diversen anthropogenen Stressoren ausgesetzt sind, wobei Pestizide für landwirtschaftliche Bäche am relevantesten erscheinen. Aufgrund der Diskrepanz zwischen modellierten und gemessenen Pestizid-konzentrationen ist Monitoring nötig um zukünftige Risikobewertungen und Zulassungen zu verbessern. Festzustellen ob biotische Stressreaktionen über große räumliche und zeitliche Skalen ähnlich sind, ist nötig um Schwellenwerte zum Schutz vor Stressoren abzuschätzen.
Diese Doktorarbeit beginnt mit einem Überblick über Pestizideintrittspfade in Bäche, sowie dem momentanen Stand des Pestizidmonitorings gefolgt von der Zielsetzung der Doktorarbeit. In Kapitel 2 werden Ergebnisse aus Schöpfproben von Routinemonitoring mehrerer Länder analysiert um die häufigsten Pestizidmischungen zu identifizieren. Diese Mischungen werden von wenigen Pestiziden gebildet, wobei Herbizide dominieren. Die nachgewiesenen Mischungen unterscheiden sich regional, da Nachweisgrenzen und Stoffumfang variieren. Aktuelles Routinemonitoring umfasst bisher keine Probenahmen während durch Starkregenereignisse hervorgerufene Pestizidspitzen, die wahrscheinlich Pestizidmischungen beeinflussen. In Kapitel 3 werden Sammelraten für 42 Pestizide bei der Benutzung von Passiv-sammlern vorgestellt und Empfehlungen zum Monitoring von feldrelevanten Pestizidspitzen gegeben. Damit konnte in Kapitel 4 ein Pestizidgradient in einer osteuropäischen Region aufgestellt werden in der die Landwirtschaftsintensität von niedrig bis hoch reicht. Dabei wurden Regenereignisse beprobt und eine Vielzahl von Pestiziden analysiert. Dies führte zu vielen gleichzeitig nachgewiesenen Pestiziden, von denen ein bis drei die Pestizidtoxizität bestimmten. Diese zeigte jedoch keinen Zusammenhang zur landwirtschaftlichen Intensität. Durch Mikrokosmenexperimente wurde in Kapitel 5 die Stressantwort von Pilzgemeinschaften, den Hyphomyceten, und deren assoziierter Ökosystemfunktion des Laubabbaus untersucht. Effekte einer feldrelevanten Fungizidmischung wurde über drei biogeographische Regionen sowie drei aufeinanderfolgende Zyklen von mikrobieller Laubkolonisation und -abbau untersucht. Trotz anfänglich unterschiedlichen Gemeinschaften waren Stressantworten sowie Erholungen in den untersuchten Regionen ähnlich, was auf ein generelles Muster hindeutet.
Insgesamt trägt diese Doktorarbeit zum verbesserten Verständnis von Vorkommen und Konzentrationen von Pestizidmischungen, deren Monitoring sowie ihren Auswirkungen auf eine Ökosystemfunktion bei. Wir konnten zeigen, dass die abgeschätzten Pestizidtoxizitäten potentiell Nichtzielorganismen und somit ganze Ökosystem beeinflussen. Routinemonitoring unterschätzt diese Gefahr bisher jedoch wahrscheinlich. Effekte, welche Verluste in Biodiversität sowie Funktionen hervorrufen, können verringert werden indem zugelassene Pestizide mit anhaltendem Monitoring neu bewertet werden und die Datenlage zu Pestizidwirkungen verbessert wird.
The three biodegradable polymers polylactic acid (PLA), polyhydroxybutyrate (PHB) and polybutylene adipate terephthalate (PBAT) were coated with hydrogenated amorphous carbon layers (a-C:H) in the context of this thesis. A direct alignment of the sample surface to the source was chosen, resulting in the deposition of a robust, r-type a-C:H. At the same time, a partly covered silicon wafer was placed together with the polymers in the coating chamber and was coated. Silicon is a hard material and serves as a reference for the applied layers. Due to the hardness of the material, no mixed phase occurs between the substrate and the applied layer (no interlayer formation). In addition, the thickness of the applied layer can be estimated with the help of the silicon sample.
The deposition of the layer was realized by radio frequency plasma enhanced chemical vapor deposition (RF-PECVD). For the coating the samples were pre-treated with an oxygen plasma. Acetylene was used as precursor gas for the plasma coating. Coatings with increasing thickness in 50 nm steps from 0-500 nm were realised.
The surface analysis was performed using several techniques: The morphology and layer stability were analyzed with scanning electron microscopy (SEM) measurements. The wettability was determined by contact angle technique. In addition, the contact angles provide macroscopic information about the bond types of the carbon atoms present on the surface. For microscopic analysis of the chemical composition of the sample and layer surfaces, diffuse reflectance Fourier transform infrared spectroscopy (DRIFT) as well as synchrotron based X-ray photon spectroscopy (XPS) and near edge X-ray absorption fine structure spectroscopy (NEXAFS) were used.
All coated polymers showed several cases of layer failure due to internal stress in the layers. However, these were at different layer thicknesses, so there was a substrate effect. In addition, it is visible in the SEM images that the coatings of PLA and PHB can cause the applied layer to wave, the so-called cord buckling. This does not occur with polymer PBAT, which indicates a possible better bonding of the layer to the polymer. The chemical analyses of the layer surfaces show for each material a layer thickness dependent ratio of sp² to sp³ bonds of carbon, which alternately dominate the layer. In all polymers, the sp³ bond initially dominates, but the sp² to sp³ ratio changes at different intervals. Although the polymers were coated in the same plasma, i.e. the respective layer thicknesses (50 nm, 100 nm, ...) were applied in the same plasma process, the respective systems differed considerably from each other. A substrate effect is therefore demonstrably present. In addition, it was found that a change in the dominant bond from sp³ to sp² is an indication ofan upcoming layer failure of the a-C:H layer deposited on the polymer. In the case of PLA, this occurs immediately with change to sp² as the dominant bond; in the case of PHB and PBAT, this occurs with different delay to increased layer thicknesses (at PHB 100 nm, at PBAT approx. 200 nm.
Overall, this thesis shows that there is a substrate effect in the coating of the biodegradable polymers PLA, PHB and PBAT, since despite the same coating there is a different chemical composition of the surface at the respective layer thicknesses. In addition, a layer failure can be predicted by analyzing the existing bond.
Data-minimization and fairness are fundamental data protection requirements to avoid privacy threats and discrimination. Violations of data protection requirements often result from: First, conflicts between security, data-minimization and fairness requirements. Second, data protection requirements for the organizational and technical aspects of a system that are currently dealt with separately, giving rise to misconceptions and errors. Third, hidden data correlations that might lead to influence biases against protected characteristics of individuals such as ethnicity in decision-making software. For the effective assurance of data protection needs,
it is important to avoid sources of violations right from the design modeling phase. However, a model-based approach that addresses the issues above is missing.
To handle the issues above, this thesis introduces a model-based methodology called MoPrivFair (Model-based Privacy & Fairness). MoPrivFair comprises three sub-frameworks: First, a framework that extends the SecBPMN2 approach to allow detecting conflicts between security, data-minimization and fairness requirements. Second, a framework for enforcing an integrated data-protection management throughout the development process based on a business processes model (i.e., SecBPMN2 model) and a software architecture model (i.e., UMLsec model) annotated with data protection requirements while establishing traceability. Third, the UML extension UMLfair to support individual fairness analysis and reporting discriminatory behaviors. Each of the proposed frameworks is supported by automated tool support.
We validated the applicability and usability of our conflict detection technique based on a health care management case study, and an experimental user study, respectively. Based on an air traffic management case study, we reported on the applicability of our technique for enforcing an integrated data-protection management. We validated the applicability of our individual fairness analysis technique using three case studies featuring a school management system, a delivery management system and a loan management system. The results show a promising outlook on the applicability of our proposed frameworks in real-world settings.
Amphibian populations are declining worldwide for multiple reasons such as habitat destruction and climate change. An example for an endangered European amphibian is the yellow-bellied toad Bombina variegata. Populations have been declining for decades, particularly at the northern and western range margin. One of the extant northern range centres is the Westerwald region in Rhineland-Palatinate, Germany. To implement informed conservation activities on this threatened species, knowledge of its life-history strategy is crucial. This study therefore focused on different developmental stages to test predictions of life-history theory. It addressed (1) developmental, (2) demographic and (3) genetic issues of Bombina variegata as a model organism: (1) Carry-over effects from larval environment to terrestrial stages and associated vulnerability to predators were investigated using mesocosm approaches, fitness tests and predation trials. (2) The dynamics and demography of B. variegata populations were studied applying a capture-mark-recapture analysis and skeletochronology. The study was complemented through (3) an analysis of genetic diversity and structuring of B. variegata populations using 10 microsatellite loci. In order to reveal general patterns and characteristics among B. variegata populations, the study focused on three geographical scales: local (i.e. a former military training area), regional (i.e. the Westerwald region) and continental scale (i.e. the geographical range of B. variegata). The study revealed carry-over effects of larval environment on metamorph phenotype and behaviour causing variation in fitness in the early terrestrial stage of B. variegata. Metamorph size and condition are crucial factors for survival, as small-sized individuals were particularly prone to predator attacks. Yellow-bellied toads show a remarkable fast-slow continuum of the life-history trait longevity. A populations’ position within this continuum may be determined by local environmental stochasticity, i.e. an extrinsic source of variation, and the efficiency of chemical antipredator protection, i.e. an intrinsic source of variation. Extreme longevity seems to be an exception in B. variegata. Senescence was absent in this study. Weather variability affected reproductive success and thus population dynamics. The dispersal potential was low and short-term fragmentation of populations caused significant genetic differentiation at the local scale. Long-term isolation resulted in increased genetic distance at the regional scale. At the continental scale, populations inhabiting the marginal regions were deeply structured with reduced allelic richness. As consequence of environmental changes, short-lived and isolated B. variegata populations at the range margin may face an increased risk of extinction. Conservation measures should thus improve the connectivity among local populations and reinforce annual reproductive success. Further research on the intraspecific variation in B. variegata skin toxins is required to reveal potential effects on palatability and thus longevity.