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Institut
- Fachbereich 4 (115)
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Invasive species play increasing roles worldwide. Invasions are considered successful when species establish and spread in their exotic range. Subsequently, dispersal is a major determinant of species’ range dynamics. Mermessus trilobatus, native to North America, has rapidly spread in Europe via aerial dispersal. Here we investigated the interplay of ecological and evolutionary processes behind its colonisation success.
First, we examined two possible ecological mechanisms. Similar to other invasive invertebrates, the colonisation success of Mermessus trilobatus might be related to human-induced habitat disturbance. Opposite to this expectation, our results showed that densities of Mermessus trilobatus decreased with soil disturbance in grasslands suggesting that its invasion success was not connected to a ruderal strategy. Further, invasive species often escape the ecological pressures from novel enemies in their exotic ranges. Unexpectedly, invasive Mermessus trilobatus was more sensitive to a native predator than native Erigone dentipalpis during our predator susceptibility trials. This indicates that the relation between the invasive spider and its native predator is dominated by prey naïveté rather than enemy release.
The remaining three chapters of the thesis investigated the dispersal behaviour of this invasive species. Hitherto, studies of passive aerial dispersal used wind as the primary dispersal-initiating factor despite a recent demonstration of the effects of the atmospheric electric fields on spiders’ pre-dispersal behaviour. During our experiments, only the wind facilitated the flight, although electric fields induced pre-dispersal behaviour in spiders. Consequently, studies around passive aerial dispersal should control electric fields but use wind as a stimulating factor.
Rapidly expanding species might be disproportionately distributed in their exotic range, with an accumulation of dispersive genotypes at the leading edge of their range. Such imbalanced spatial segregation is possible when the dispersal behaviour of expanding species is heritable. Our results showed that the dispersal traits of Mermessus trilobatus were heritable through both parents and for both sexes with recessive inheritance of high dispersal ability in this species.
Following the heritability experiments, we documented an accelerated spread of Mermessus trilobatus in Europe and tested whether dispersal, reproduction or competing ability was at the source of this pattern. Our results showed that the accumulation of more mobile but not reproductive or competitive genotypes at the expansion front of this invasive species gave rise to an accelerated range expansion by more than 1350 km in under 45 years.
Invasive Mermessus trilobatus is inferior to native sympatric species with respect to competing ability (Eichenberger et al., 2009), disturbance tolerance and predation pressure. Nevertheless, the species successfully established in its exotic range and spread by accelerating its expansion rate. Rapid reproduction that balances the high ecological pressures might be the other potential mechanism behind its colonisation success in Europe and deserves further investigation.
Intensivierung der Landwirtschaft führt weltweit zu einem fortschreitenden Verlust der biologischen Vielfalt in Agrarlandschaften. Die daraus resultierende Homogenität der Landschaft, die mit der Ausweitung von Monokulturflächen und dem Verlust naturnaher Lebensräume einhergeht, hat schwerwiegende Auswirkungen auf Arthropoden in Agrarlandschaften. Während Ackerflächen aufgrund intensiver und häufiger Störungen für viele Arten ungeeignete Habitate darstellen, können naturnahe Lebensräume in Agrarökosystemen als wichtige Rückzugsflächen fungieren. Die Erschaffung von naturnahen Lebensräumen durch Agrarumweltmaßnahmen in intensiven Agrarlandschaften, wie der Maifelder Agrarlandschaft in Westdeutschland, sollen den negativen Auswirkungen der landwirtschaftlichen Intensivierung entgegenwirken. Allerdings ist die Wirksamkeit dieser Maßnahmen für den Artenschutz noch umstritten. Aus diesem Grund wird in dieser Arbeit die Artenvielfalt der Käfer (Coleoptera) und Spinnen (Araneida) auf Weizenfeldern und verschiedenen naturnahen Lebensräumen (grasbewachsene Feldränder angrenzend an Weizen- und Rapsfelder; klein- und großflächige, mit Wildblumenmischungen eingesäte, Stilllegungsflächen; dauerhafte Grünlandbrachen) miteinander verglichen. Hierfür wurden die Arthropoden in den Jahren 2019 und 2020 mit Bodenfallen und Saugproben erfasst. Die vorliegenden Ergebnisse zeigen, dass die Landnutzung die Käfer- und Spinnendiversität im Untersuchungsgebiet beeinflusst, mit einer deutlich höheren Artenvielfalt auf den Grünlandbrachen als auf den Weizenfeldern. Überraschenderweise bestanden zwischen allen naturnahen Lebensräumen nur geringe Unterschiede, jedoch beherbergten sie unterschiedliche Artengemeinschaften. Hier unterschieden sich vor allem die Käfer- und Spinnengemeinschaften der großflächigen Grünlandbrachen deutlich von allen anderen untersuchten Landnutzungstypen. Insbesondere für Habitatspezialisten und gefährdete Arten stellten die Grünlandbrachen wichtige Lebensräume dar, wahrscheinlich aufgrund ihrer variablen Bodenfeuchtigkeit und komplexen Lebensraumstruktur. Im Gegensatz dazu wiesen Weizenfelder homogene Arthropodengemeinschaften mit einem geringeren Merkmalsreichtum auf und wurden von einigen wenigen räuberischen Arten dominiert, die sich an derartig intensive Lebensräume angepasst haben. Die Ergebnisse deuten darauf hin, dass sich alle Schutzmaßnahmen ergänzen, indem sie auf unterschiedliche Weise zur Förderung der Käfer und Spinnen auf landwirtschaftlichen Flächen beitragen können. Selbst kleinflächige naturnahe Lebensräume und bestehende Habitatgrenzen in einer landwirtschaftlichen Matrix scheinen wertvolle Lebensräume für Arthropoden in Agrarökosystemen darzustellen, indem sie zur Erhöhung der taxonomischen Vielfalt beitragen. Feldränder und kleine, mit Wildblumen eingesäte Flächen, können isolierte naturnahe Lebensräume miteinander verbinden und zu einer heterogenen Agrarlandschaft beitragen. Folglich führt eine Kombination verschiedener klein- und großflächiger Begrünungsmaßnahmen zu einer erhöhten Landschaftsheterogenität, die sich wiederum positiv auf die Käfer- und Spinnenvielfalt auswirkt. In Anbetracht des weltweit anhaltenden Verlustes der Artenvielfalt in Agrarlandschaften, sollten Agrarumweltmaßnahmen in Zukunft gefördert werden, da sie für den Arthropodenschutz in intensiven Agrarlandschaften, wie im Maifeld, besonders bedeutsam sind.
Remote Working Study 2022
(2022)
The Remote Working Study 2022 is focused on the transition to work from home (WFH) triggered by the stay at home directives of 2020. These directives required employees to work in their private premises wherever possible to reduce the transmission of the coronavirus. The study, conducted by the Center for Enterprise Information Research (CEIR) at the University of Koblenz from December 2021 to January 2022, explores the transition to remote working.
The objective of the survey is to collect baseline information about organisations’ remote work experiences during and immediately following the COVID-19 lockdowns. The survey was completed by the key persons responsible for the implementation and/or management of the digital workplace in 19 German and Swiss organisations.
The data presented in this report was collected from member organisations of the IndustryConnect initiative. IndustryConnect is a university-industry research programme that is coordinated by researchers from the University of Koblenz. It focuses on research in the areas of the digital workplace and enterprise collaboration technologies, and facilitates the generation of new research insights and the exchange of experiences among user companies.
The ongoing loss of species is a global threat to biodiversity, affecting ecosystems worldwide. This also concerns arthropods such as insects and spiders, which are especially endangered in agricultural ecosystems. Here, one of the main causing factors is management intensification. In areas with a high proportion of traditionally managed grassland, extensive hay meadows that are cut only once per year can still hold high levels of biodiversity, but are threatened by conversion into highly productive silage grassland. The Westerwald mountain range, western Germany, is such a region. In this thesis, I compare the local diversity of bees, beetles, hoverflies, leafhoppers, and spiders of five grassland management regimes along a gradient of land-use intensity. These comprise naturally occurring grassland fallows, three types of traditionally managed hay meadows, and intensively used silage grassland. By using three different sampling methods, I recorded ground-dwelling, flower-visiting, and vegetation-dwelling species. The results show that in most cases species richness and diversity are highest on fallows, whereas variation among different managed grassland types is very low. Also, for most sampled taxa, fallows harbour the most distinct species assemblages, while that of other management regimes are largely overlapping. Management has the largest effect on species composition, whereas environmental parameters are of minor importance. Long-term grassland fallows seem to be highly valuable for arthropod conservation, even in a landscape with a low overall land-use intensity, providing structural heterogeneity. In conclusion, such fallows should be subsidized agri-environmental schemes, to preserve insect and spider diversity.
Eine nachhaltige Intensivierung der Landwirtschaft ist notwendig, um die wachsende Weltbevölkerung zu ernähren ohne die Bodenqualität durch verstärkte Bodendegradation zu verschlechtern. Plastikmul-che (PM) werden weltweit zunehmend eingesetzt, um Wachstum und Ertrag von Feldfrüchten zu ver-bessern und somit die landwirtschaftliche Produktivität zu steigern. Zunehmend finden sich aber auch kritische Aspekte der PM-Anwendung auf die Bodenqualität sowie widersprüchliche Ergebnisse in der wissenschaftlichen Literatur. Grund könnte die Anwendung in verschiedenen Klimaten und bei unter-schiedlichen Feldkulturen, Böden und landwirtschaftlichen Techniken sein. Ein genauerer Blick ist so-mit notwendig, um den PM-Einfluss auf die Bodenprozesse unter verschiedenen Klima- und Anbaube-dingungen umfassend zu verstehen und hinsichtlich einer nachhaltigen Landwirtschaft zu bewerten.
Ziel dieser Doktorarbeit war es, zu verstehen, inwieweit eine mehrjährige PM-Anwendung verschiedene Bodeneigenschaften und -prozesse unter gemäßigt, humidem Klima in Mitteleuropa beeinflusst und die Folgen für die Bodenqualität zu bewerten. Hierfür untersuchte ich in einer dreijährigen Feldstudie, wie PM (schwarzes Polyethylen, 50 μm) das Mikroklima, die Strukturstabilität, die organische Bodensub-stanz (OBS) und die Konzentrationen bestimmter Fungizide und Mykotoxine in drei Bodenschichten (0–10, 10–30 and 30–60 cm) im Vergleich zu Strohmulch (SM) beeinflusst. Beide Bodenabdeckungen wurden in einer Dammkultur mit Tröpfchenberegnung im Erdbeeranbau eingesetzt.
Die PM veränderten das Mikroklima des Bodens hin zu höheren Temperaturen und niedrigeren Was-sergehalten. Hauptfaktor für das gesteigerte Pflanzenwachstum unter gegebenem Klima dürfte somit die höhere Bodentemperatur sein. Die niedrigere Bodenfeuchte unter PM zeigte, dass die verhinderte Nie-derschlagsversickerung stärker den Wasserhaushalt beeinflusste als die reduzierte Evaporation, was auf eine ineffiziente Niederschlagsnutzung hinweist. Die PM veränderten den Wasserkreislauf hin zu ver-mehrt seitlichen Wasserflüssen von der Furche zum Damm und weniger vertikalen Sickerwasserflüssen im Damm. Letzteres verringerte die Stickstoffauswaschung im Oberboden (0–10 cm) in der Anwachs-phase der Erdbeeren. PM verhinderte eine abrupte Bodendurchnässung und Überschusswasser bei Re-genfällen und somit Aggregatzerstörung. So wurde eine lockere und stabile Bodenstruktur erhalten, die Bodenverdichtung und Bodenerosion vorbeugt. PM veränderte Kohlenstoffaustausch und -umwandlung hin zu einer größeren und stabileren OBS. Somit kompensierte die unterirdische Biomassenproduktion unter PM den temperaturbedingt beschleunigten OBS Abbau sowie den fehlenden Eintrag oberirdischer Biomasse. Das SM erhöhte jedoch die labile und totale OBS im Oberboden nach dem ersten Versuchs-jahr und steigerte das mikrobielle Wachstum durch den oberirdischen Biomasseeintrag. PM verringerte den Fungizideintrag in den Boden und verursachte kein erhöhtes Mykotoxinvorkommen. Somit stellt PM kein erhöhtes Risiko für Bodenkontaminationen und die Bodenqualität dar. Diese Doktorarbeit zeigte, dass sich die PM-Effekte zeitlich, saisonal und zwischen den Bodenschichten unterschieden, womit die Bedeutung der Faktoren Bodentiefen und Zeit für zukünftige Studien belegt wurde.
Verglichen mit ariden Gebieten, waren die beobachteten PM-Einflüsse klein, ausgeblieben oder anders. Als Grund hierfür vermute ich, dass PM in humidem Klima die Bodenfeuchte verringerte anstatt zu erhöhen und dass unter SM das Stroh und Blätterwerk einen PM-ähnlichen „Abdeckungseffekt“ verur-sachte. Eine Generalisierung der PM-Effekte über verschiedenen Klimazonen ist somit kaum möglich, da sich die Effekte in Art und Ausmaß in Abhängigkeit vom Klima unterscheiden. Die PM-Effekte auf die Bodenqualität müssen somit differenziert beurteilt werden. Ich schlussfolgere, dass PM in humiden Klimaten Bodendegradationen vermindern könnte (z.B., OBS Abbau, Erosion, Nährstoffauswaschung, Verdichtung und Kontamination) und somit hilft, Bodenqualität zu erhalten und eine nachhaltige, land-wirtschaftliche Intensivierung zu ermöglichen. Allerdings ist weitere Forschung nötig um meine Ergeb-nisse auf größeren Skalen, über längere Zeitperioden und bei verschiedenen Böden und Feldfrüchte zu überprüfen, verbleibende offene Fragen zu beantworten und Verbesserungen zu entwickeln, um die Nachteile der PM zu überwinden (z.B. Bodenverunreinigung mit Plastik, Entsorgung der Mulche).
The decline of biodiversity can be observed worldwide and its consequences are alarming. It is therefore crucial that nature must be protected and, where possible, restored. A wide variety of different project options are possible. Yet in the context of limited availability of resources, the selection of the most efficient measures is increasingly important. For this purpose, there is still a lack of information. This pertains, as outlined in the next paragraph, in particular, to information at different scales of projects.
Firstly, there is a lack of information on the concrete added value of biodiversity protection projects. Secondly, there is a lack of information on the actual impacts of such projects and on the costs and benefits associated with a project. Finally, there is a lack of information on the links between the design of a project, the associated framework conditions and the perception of specific impacts. This paper addresses this knowledge gap by providing more information on the three scales by means of three empirical studies on three different biodiversity protection projects in order to help optimize future projects.
The first study “Assessing the trade-offs in more nature-friendly mosquito control in the Upper Rhine region” examines the added value of a more nature-friendly mosquito control in the Upper Rhine Valley of Germany using a contingent valuation method. Recent studies show that the widely used biocide Bti, which is used as the main mosquito control agent in many parts of the world, has more negative effects on nature than previously expected. However, it is not yet clear whether the population supports a more nature-friendly mosquito control, as such an adaptation could potentially lead to higher nuisance. This study attempts to answer this question by assessing the willingness to pay for an adapted mosquito control strategy that reduces the use of Bti, while maintaining nuisance protection within settlements. The results show that the majority of the surveyed population attaches a high value to a more nature-friendly mosquito control and is willing to accept a higher nuisance outside of the villages.
The second study “Inner city river restoration projects: the role of project components for acceptance” examines the acceptance of a river restoration project in Rhineland-Palatinate, Germany. Despite much effort, many rivers worldwide are still in poor condition. Therefore, a rapid implementation of river restoration projects is of great importance. In this context, acceptance by society plays a fundamental role, however, the factors determining such acceptance are still poorly understood. In particular, the complex interplay between the acceptance or rejection of specific project components and the acceptance of the overall project require further exploration. This study addresses this knowledge gap by assessing the acceptance of the project, its various ecological and social components, and the perception of real and fictitious costs as well as the benefits of the components. Our findings demonstrate that while acceptance of the overall project is generally rather high, many respondents reject one or more of the project's components. Complementary social project components, like a playground, find less support than purely ecological components. Overall, our research shows that complementary components may increase or decrease acceptance of the overall project. We, furthermore, found that differences in the acceptance of the individual components depend on individual concerns, such as perceived flood risk, construction costs, expected noise and littering as well as the quality of communication, attachment to the site, and the age of the respondents.
The third study “What determines preferences for semi-natural habitats in agrarian landscapes? A choice-modelling approach across two countries using attributes characterizing vegetation” investigates people's aesthetic preferences for semi-natural habitats in agricultural landscapes. The EU-Common Agricultural Policy promotes the introduction of woody and grassy semi-natural habitats (SNH) in agricultural landscapes. While the benefits of these structures in terms of regulating ecosystem services are already well understood, the effects of SNH on visual landscape quality is still not clear. This study investigates the factors determining people’s visual preferences in the context of grassy and woody SNH elements in Swiss and Hungarian landscapes using picture-based choice experiments. The results suggest that respondents’ choices strongly depend on specific vegetation characteristics that appear and disappear over the year. In particular, flowers as a source of colours and green vegetation as well as ordered structure and the proportion of uncovered soil in the picture play an important role regarding respondents’ aesthetic perceptions of the pictures.
The three empirical studies can help to make future projects in the study areas of biodiversity protection more efficient. While this thesis highlights the importance of exploring biodiversity protection projects at different scales, further analyses of the different scales of biodiversity protection projects are needed to provide a sound basis to develop guidance on identifying the most efficient biodiversity protection projects.
Objectives: Crayfish plague disease, caused by the oomycete pathogen Aphanomyces astaci represents one of the greatest risks for the biodiversity of the freshwater crayfish. This data article covers the de novo transcriptome assembly and annotation data of the noble crayfish and the marbled crayfish challenged with Ap. astaci. Following the controlled infection experiment (Francesconi et al. in Front Ecol Evol, 2021, https://doi.org/10.3389/fevo.2021.647037), we conducted a differential gene expression analysis described in (Boštjančić et al. in BMC Genom, 2022, https://doi.org/10.1186/s12864-022-08571-z) Data description: In total, 25 noble crayfish and 30 marbled crayfish were selected. Hepatopancreas tissue was isolated, followed by RNA sequencing using the Illumina NovaSeq 6000 platform. Raw data was checked for quality with FastQC, adapter and quality trimming were conducted using Trimmomatic followed by de novo assembly with Trinity. Assembly quality was assessed with BUSCO, at 93.30% and 93.98% completeness for the noble crayfish and the marbled crayfish, respectively. Transcripts were annotated using the Dammit! pipeline and assigned to KEGG pathways. Respective transcriptome and raw datasets may be reused as the reference transcriptome assemblies for future expression studies.
Predictive Process Monitoring setzt sich als Hilfsmittel zur Unterstützung der betrieblichen Abläufe in Unternehmen immer mehr durch Die meisten heute verfüg-baren Softwareanwendungen erfordern jedoch ein umfangreiches technisches Know-how des Betreibers und sind daher für die meisten realen Szenarien nicht geeignet. Daher wird in dieser Arbeit eine prototypische Implementierung eines Predictive Process Monitoring Dashboards in Form einer Webanwendung vorgestellt. Das System basiert auf dem von Bartmann et al. (2021) vorgestellten PPM-Camunda-Plugin und ermöglicht es dem Benutzer, auf einfache Weise Metriken, Visualisierungen zur Darstellung dieser Metriken und Dashboards, in denen die Visualisierungen angeordnet werden können, zu erstellen. Ein Usability-Test mit Testnutzern mit unterschiedlichen Computerkenntnissen wird durchgeführt, um die Benutzerfreundlichkeit der Anwendung zu bestätigen.
Challenges of Implementing Innovation Strategies at Large Organizations: A case of Lotte Group
(2023)
For many decades, one of the most important focuses of research has been on determining whether or not there is a correlation between the size of an organization and its level of innovation. Unlike small companies, large companies often have well-established structure that are hard to change and change managements seems to be much more difficult especially related to innovation. Nevertheless, there are many examples to prove the opposites. Some large organization like Apple, Amazon... always show great innovation efforts and keep changing in a much positive way. Therefore, the aim of this thesis is to discuss of how large organization can be able to implement innovation when having much drawbacks compare to SMEs. Through the use of a qualitative research approach, researcher was able to explore essential information on the innovation strategies that large companies are using in order to innovate and how they could overcome existing challenges by studying the working process of Lotte Group – one of the biggest companies in Korea.
Die Aufmerksamkeit politischer Entscheidungsträger weltweit richtet sich in den letzten 10 Jahren verstärkt auf die Kreativwirtschaft als signifikanter Wachstums- und Beschäftigungsmotor in Städten. Die Literatur zeigt jedoch, dass Kreativschaffende zu den gefährdetsten Arbeitskräften in der heutigen Wirtschaft gehören. Aufgrund des enorm deregulierten und stark individualisierten Umfelds werden Misserfolg oder Erfolg eher individuellen Fähigkeiten und Engagement zugeschrieben und strukturelle oder kollektive Aspekte vernachlässigt. Diese Arbeit widmet sich zeitlichen, räumlichen und sozialen Aspekten digitaler behavioraler Daten, um zu zeigen, dass es tatsächlich strukturelle und historische Faktoren gibt, die sich auf die Karrieren von Individuen und Gruppen auswirken. Zu diesem Zweck bietet die Arbeit einen computergestützten, sozialwissenschaftlichen Forschungsrahmen, der das theoretische und empirisches Wissen aus jahrelanger Forschung zu Ungleichheit mit computergestützten Methoden zum Umgang mit komplexen und umfangreichen digitalen Daten verbindet. Die Arbeit beginnt mit der Darlegung einer neuartigen Methode zur Geschlechtererkennung, welche sich Image Search und Gesichtserkennungsmethoden bedient. Die Analyse der kollaborativen Verhaltensweisen sowie der Zitationsnetzwerke männlicher und weiblicher Computerwissenschaftler*innen verdeutlicht einige der historischen Bias und Nachteile, welchen Frauen in ihren wissenschaftlichen Karrieren begegnen. Zur weiterfuhrenden Elaboration der zeitlichen Aspekte von Ungleichheit, wird der Anteil vertikaler und horizontaler Ungleichheit in unterschiedlichen Kohorten von Wissenschaftler*innen untersucht, die ihre Karriere zu unterschiedlichen Zeitpunkten begonnen haben. Im Weiteren werden einige der zugrunde liegenden Mechanismen und Prozesse von Ungleichheit in kreativen Berufen analysiert, wie der Matthew-Effekt und das Hipster-Paradoxon. Schließlich zeigt diese Arbeit auf, dass Online-Plattformen wie Wikipedia bestehenden Bias reflektieren sowie verstärken können.
The diversity within amphibian communities in cultivated areas in Rwanda and within two selected, taxonomically challenging groups, the genera Ptychadena and Hyperolius, were investigated in this thesis. The amphibian community of an agricultural wetland near Butare in southern Rwanda comprised 15 anuran species. Rarefaction and jackknife analyses corroborated that the complete current species richness of the assemblage had been recorded, and the results of acoustic niche analysis suggested species saturation of the community. Surveys at many other Rwandan localities showed that the species recorded in Butare are widespread in cultivated and pristine wetlands. The species were readily distinguishable using morphological, bioacoustic, and molecular (DNA barcoding) features, but only eight of the 15 species could be assigned unambiguously to nominal species. The remaining represented undescribed or currently unrecognized taxa, including three species of Hyperolius, two Phrynobatrachus species, one Ptychadena species, and one species of Amietia. The diversity of the Ridged Frogs in Rwanda was investigated in two studies (Chapters III and IV). Three species of Ptychadena were recorded in wetlands in the catchment of the Nile. They can be distinguished by morphological characters (morphometrics and qualitative features) as well as by their advertisement calls and genetics. The Rwandan species of the P. mascareniensis group was shown to differ from the topotypic population as well as from other genetic lineages in sub-Saharan Africa and an old available name, P. nilotica, was resurrected from synonymy for this lineage. Two further Ptychadena species were identified among voucher specimens from Rwanda deposited in the collection of the RMCA, P. chrysogaster and P. uzungwensis. Morphologically they can be unambiguously distinguished from each other and the three other Rwandan species. A key based on qualitative morphological characters was developed, which allows unequivocal identification of specimens of all species that have been recorded from Rwanda. DNA was isolated from a Rwandan voucher specimen of P. chrysogaster, and the genetic analysis corroborated the species" distinct status.
A species of Hyperolius collected in the Nyungwe National Park was compared to all other Rwandan species of the genus and to morphologically or genetically similar species from neighbouring countries. Its distinct taxonomic status was justified by morphological, bioacoustic, and molecular evidence and it was described as a new species, H. jackie. A species of the H. nasutus group collected at agricultural sites in Rwanda was described as a new species in the course of a revision of the species of the Hyperolius nasutus group. The group was shown to consist of 15 distinct species which can be distinguished from each other genetically, bioacoustically, and morphologically.
The aerial performance, i.e. parachuting, of the Disc-fingered Reed Frog, Hyperolius discodactylus, was described. It represents a novel observation of a behaviour that has been known from a number of Southeast Asian and Neotropical frog species. Parachuting frogs, including H. discodactylus, exhibit certain morphological characteristics and, while airborne, assume a distinct posture which is best-suited for maneuvering in the air. Another study on the species addressed the validity of the taxon H. alticola which had been considered either a synonym of H. discodactylus or a distinct species. Type material of both taxa was re-examined and the status of H. alticola reassessed using morphological data from historic and new collections, call recordings, and molecular data from animals collected on recent expeditions. A northern and a southern genetic clade were identified, a divide that is weakly supported by diverging morphology of the vouchers from the respective localities. No distinction in advertisement call features could be recovered to support this split and both genetic and morphological differences between the two geographic clades are marginal and not always congruent and more likely reflect population-level variation. Therefore it was concluded that H. alticola is not a valid taxon and should be treated as a synonym of H. discodactylus.
On the recognition of human activities and the evaluation of its imitation by robotic systems
(2023)
This thesis addresses the problem of action recognition through the analysis of human motion and the benchmarking of its imitation by robotic systems.
For our action recognition related approaches, we focus on presenting approaches that generalize well across different sensor modalities. We transform multivariate signal streams from various sensors to a common image representation. The action recognition problem on sequential multivariate signal streams can then be reduced to an image classification task for which we utilize recent advances in machine learning. We demonstrate the broad applicability of our approaches formulated as a supervised classification task for action recognition, a semi-supervised classification task for one-shot action recognition, modality fusion and temporal action segmentation.
For action classification, we use an EfficientNet Convolutional Neural Network (CNN) model to classify the image representations of various data modalities. Further, we present approaches for filtering and the fusion of various modalities on a representation level. We extend the approach to be applicable for semi-supervised classification and train a metric-learning model that encodes action similarity. During training, the encoder optimizes the distances in embedding space for self-, positive- and negative-pair similarities. The resulting encoder allows estimating action similarity by calculating distances in embedding space. At training time, no action classes from the test set are used.
Graph Convolutional Network (GCN) generalized the concept of CNNs to non-Euclidean data structures and showed great success for action recognition directly operating on spatio-temporal sequences like skeleton sequences. GCNs have recently shown state-of-the-art performance for skeleton-based action recognition but are currently widely neglected as the foundation for the fusion of various sensor modalities. We propose incorporating additional modalities, like inertial measurements or RGB features, into a skeleton-graph, by proposing fusion on two different dimensionality levels. On a channel dimension, modalities are fused by introducing additional node attributes. On a spatial dimension, additional nodes are incorporated into the skeleton-graph.
Transformer models showed excellent performance in the analysis of sequential data. We formulate the temporal action segmentation task as an object detection task and use a detection transformer model on our proposed motion image representations. Experiments for our action recognition related approaches are executed on large-scale publicly available datasets. Our approaches for action recognition for various modalities, action recognition by fusion of various modalities, and one-shot action recognition demonstrate state-of-the-art results on some datasets.
Finally, we present a hybrid imitation learning benchmark. The benchmark consists of a dataset, metrics, and a simulator integration. The dataset contains RGB-D image sequences of humans performing movements and executing manipulation tasks, as well as the corresponding ground truth. The RGB-D camera is calibrated against a motion-capturing system, and the resulting sequences serve as input for imitation learning approaches. The resulting policy is then executed in the simulated environment on different robots. We propose two metrics to assess the quality of the imitation. The trajectory metric gives insights into how close the execution was to the demonstration. The effect metric describes how close the final state was reached according to the demonstration. The Simitate benchmark can improve the comparability of imitation learning approaches.
FinTech is deemed to be an underexplored phenomenon even in academic and real environments. Among (1) “Sustainable FinTech” – the application of information technology as innovation in established financial services providers’ business operation; and (2) “Disruptive FinTech” – the provision of financial products and services by non-incumbents which in most cases are information technology entrepreneurs, the former receives more attention. In order to contribute to Disruptive FinTech category, the thesis strive to examine Entrepreneurial Strategy framework applied for technology players taking part in Vietnam financial market.
Digital Transformation Maturity of Vietnam Aviation Industry: The Effect of Organizational Readiness
(2023)
The paper studies the digital transformation maturity in the context of the aviation industry in Vietnam. Digital transformation can mean enhancing existing processes, finding new opportunities within existing business domains, or finding new opportunities outside existing business domains. In the era of post Covid-19, digital transformation will play a vital role in the recovery with the support from digital technology to leverage the communication and implementation of new projects or changes.
Digital transformation and digital transformation maturity sometimes are used indistinguishing, but they are two different definitions. This paper will further explain the differences and will apply digital transformation maturity as a scale for the digital transformation in the report.
Due to the lack of experiment in the relationship between digital transformation maturity and the organizational readiness, the study will explore four components of organizational readiness, including digital leadership, digital culture, digital capabilities, and digital partnering.
The paper is a study focusing on exploring which factors and examining the impact of those factors influencing the entrepreneurial intention among students in the Construction industry, specifically among students of Hanoi Construction University and Hanoi Architecture University. The study also mentions some solution of this findings for entrepreneurship in the Construction field in Vietnam that the author might think of based on this research work for future study. The Theory of planned behavior is used as the theoritical framework for this study. Both qualitative and quantitative methods are employed. The questionaire will be conducted among students of the two universities mentioned above. Then, an exploratory factor analysis (EFA) will performed to test the validity of the constructs. The research findings provide factors and their impact factors influencing the entrepreneurial intention and propose some solutions to improve the entrepreneurship in the Construction field in Vietnam.
Digital transformation is a prevailing trend in the world, especially in dynamic Asia. Vietnam has recorded remarkable changes in the economy as domestic enterprises have made new strides in the digital transformation process. MB Bank, one of the prestigious financial groups in Vietnam, also takes advantage of digital transformation to have the opportunity to break through to become a large-scale technology enterprise with many factors such as improving customer experience, increasing customer base and increasing customer satisfaction. enhance competitiveness, build trust and loyalty for customers. However, in the process of converting MB, there are also many challenges that require banks to have appropriate policies to handle. It can be said that MB Bank is a typical case study of digital transformation in the banking sector in Vietnam.
Durch die zunehmende Wichtigkeit und Dringlichkeit des Klimawandels sind Unternehmen aufgefordert, einen Beitrag zu nachhaltiger Entwicklung zu leisten, insbesondere durch die jüngeren Generationen. Bisherige Beiträge von Unternehmen werden jedoch als unzureichend kritisiert, was insbesondere am mangelnden Engagement der Mitarbeiterinnen und Mitarbeiter für Nachhaltigkeit in Unternehmen liegen könnte. In diesem Zusammenhang wurde in den letzten Jahren Gamification als ein vielversprechendes, innovatives Tool um nachhaltige Verhaltensweisen der Mitarbeiterinnen und Mitarbeiter am Arbeitsplatz zu motivieren, vorgeschlagen und zunehmend erforscht. Es gibt jedoch nur wenige Studien und anwendbare Gamification-Lösungen, die mehr als ein spezifisches Nachhaltigkeitsthema behandeln und somit eine ganzheitliche Perspektive auf nachhaltige Verhaltensweisen am Arbeitsplatz einnehmen. Darüber hinaus mangelt es bisheriger Forschung an einem umfassenden Verständnis dafür, wie verschiedene Gamification-Elemente spezifische psychologische Effekte hervorrufen, wie sich diese in Verhaltensänderungen manifestieren und wie diese wiederum kumulativ in messbaren Unternehmensergebnissen resultieren. Der Weg von Gamification als ”Input” zu unternehmerischer Nachhaltigkeit als ”Output” ist also bislang unerforscht.
Diese Dissertation schließt diese Lücke, indem eine ganzheitliche gamifizierte Intervention konzipiert, gestaltet und evaluiert wird, die Mitarbeiterinnen und Mitarbeiter bei verschiedenen nachhaltigen Verhaltensweisen in ihren täglichen Aktivitäten unterstützt. Das Projekt verwendet einen designwissenschaftlichen Forschungsansatz, der die Mitarbeiterinnen und Mitarbeiter eng in die schrittweise Entwicklung der Lösung einbezieht. Als Teil des iterativen Designprozesses werden in dieser Dissertation sechs Studien vorgestellt, um das theoretische Verständnis von Gamification für nachhaltige Verhaltensweisen von Mitarbeiterinnen und Mitarbeitern zu erweitern. Zunächst wird ein umfassender Überblick über die bestehende Forschung zu Gamification für nachhaltiges Mitarbeiterverhalten gegeben, wobei Gamification-Designs und Ergebnisse früherer Studien analysiert und eine Agenda für die weitere Forschung aufgezeigt werden (Studie 1). Danach werden theoretische Grundlagen der Forschung zu Gamification, Serious Games und Game-based Learning (Studie 2) und empirische Gestaltungsprinzipien
für Gamification und persuasive Systeme (Studie 3) als Basis für die erfolgreiche Gestaltung gamifizierter Anwendungen systematisch untersucht. Anschließend werden in empirischen Studien Motivationen der Mitarbeiterinnen und Mitarbeiter für nachhaltiges Verhalten erforscht und ihre Erwartungen an Gestaltungsmerkmale beleuchtet (Studie 4) sowie kontextuelle Herausforderungen und Gestaltungsdilemmata bei der Implementierung von Gamification in einem organisatorischen Kontext aufgezeigt (Studie 5). Schließlich wird in einer quantitativen Feldstudie (Studie 6) untersucht, wie verschiedene Gamification-Designs nachhaltiges Mitarbeiterverhalten und unternehmerische Nachhaltigkeitskennzahlen in Organisationen beeinflussen. Basierend auf den Ergebnissen wird in dieser Dissertation ein umfassendes Framework für Gamification für nachhaltiges Mitarbeiterverhalten präsentiert, welches Design-, individuelle Verhaltens- und Unternehmensperspektiven einbezieht. Schließlich werden darauf aufbauend praktische Empfehlungen für die Gestaltung von Gamification zur Förderung nachhaltigen Mitarbeiterverhaltens am Arbeitsplatz präsentiert.
Counts of SARS-CoV-2-related deaths have been key numbers for justifying severe political, social and economical measures imposed by authorities world-wide. A particular focus thereby was the concomitant excess mortality (EM), i.e. fatalities above the expected all-cause mortality (AM). Recent studies, inter alia by the WHO, estimated the SARS-CoV-2-related EM in Germany between 2020 and 2021 as high as 200 000. In this study, we attempt to scrutinize these numbers by putting them into the context of German AM since the year 2000. We propose two straightforward, age-cohort-dependent models to estimate German AM for the ‘Corona pandemic’ years, as well as the corresponding flu seasons, out of historic data. For Germany, we find overall negative EM of about −18 500 persons for the year 2020, and a minor positive EM of about 7000 for 2021, unveiling that officially reported EM counts are an exaggeration. In 2022, the EM count is about 41 200. Further, based on NAA-test-positive related death counts, we are able to estimate how many Germans have died due to rather than with CoViD-19; an analysis not provided by the appropriate authority, the RKI. Through 2020 and 2021 combined, our due estimate is at no more than 59 500. Varying NAA test strategies heavily obscured SARS-CoV-2-related EM, particularly within the second year of the proclaimed pandemic. We compensated changes in test strategies by assuming that age-cohort-specific NAA-conditional mortality rates during the first pandemic year reflected SARS-CoV-2-characteristic constants.
X-ray computer tomography (XRT) is a three-dimensional, nondestructive, and thus reproducible examination method that allows for the investigation of internal and external structures of objects. Due to its characteristics, the XRT technique has increasingly established itself as an alternative examination method and is also applied in the field of mineral processing. Within this work, XRT is used to investigate the influence of hydrochloric acid leaching of iron-rich bauxites on grain composition. Acid leaching is a promising method for the beneficiation of iron-rich bauxites for refractories. Many studies have already established that leaching with hydrochloric acid can reduce the Fe₂O₃ content in bauxites. However, apart from the influence of the leaching process on the composition of the bauxites, aspects such as the influence of the acid on the exact grain constitution or the porosity behavior have rarely been considered so far. To address these open questions, XRT analysis was used to examine and characterize various bauxites. By comparing identical grains before and after leaching, it was observed that in gibbsite bauxites the acid penetration is deeper, and the volume decreases significantly. In diasporic and boehmitic bauxites, clear leaching edges can be seen in which the iron content has been reduced.