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Dissertation
Explaining and Visualizing Structural Knowledge in Bipartite Graphs
(2023)
Bipartite graphs are an important model for the representation and analysis of relationships between two different types of entities. Datasets in this form are commonly found in many fields, such as social networks, biology, and economics. Formal concept analysis is a research approach that allows for the analysis of such bipartite graphs by clustering the data into so-called concepts and ordering those in a lattice structure.
In this thesis we propose multiple approaches for the extraction and visualization of ...
Dissertation
Solar energy integration in agro-processing in the tropics: a case study of large and small-scale cassava processing
(2023)
Agro-processing is key to reducing post-harvest losses. Agro-processing is defined as a set of techno-economic activities applied to all the products originating from the agricultural farm, livestock, aqua cultural sources, and forests for their conservation, handling, and value-addi-tion to make them usable as food, feed, fibre, fuel, or industrial raw materials [12]. Processing can be sophisticated (relying on industrial plants and machinery) or simple (depending on the sun or indigenous small-scale processes). The ...
Dissertation
Tracing World-Class Universities in the Global Public(ity) Sphere
(2023)
Tracing World-class Universities in the Global Public(ity) Sphere The salience of reputation management has grown, both in terms of scale and prominence, in higher education management and governance, and, subsequently, higher education research in the past two decades. Reputation management is no longer a peripheral topic of interest for a few higher education researchers judging from the exponential growth in the volume of academic literature and the changing external environment in which universities communicate ...
Dissertation
Managing Collaboration in Circular Supply Chains
(2023-05)
The dissertation focuses on understanding the application of the circular economy (CE) concept to the supply chain management (SCM) domain as ‘circular supply chains’ (CSCs) and the role of collaboration in this application. While CE is an emerging approach for sustainable production and consumption, its application in the SCM domain as CSCs could assist in improving the overall sustainable performance. Collaboration with internal and external partners is crucial to achieve this improvement. Hence, with the aim to ...
Dissertation
Auswirkungen klimatischer Veränderungen auf die Überhitzung von Gebäuden und Empfehlungen zur Begrenzung sommerlicher Übertemperaturen
(2023)
Diese Arbeit beschäftigt sich mit der Identifikation von Auswirkungen sommerklimatischer Veränderungen auf Gebäude infolge des Klimawandels. Einleitend werden physikalische und klimatologische Hintergründe erläutert. Darauf aufbauend sind relevante Aspekte der in Deutschland angewendeten normativen Bewertung sommerlicher Raumüberhitzungen beschrieben. Diese Aspekte formieren die Grundlage der weiterführenden Untersuchungen von Überhitzungserscheinungen im Raum.
Die Basis für diese weiterführenden Untersuchungen ...
Dissertation
Learning planning communication in cooperative multi-agent settings
(2023)
This work is a holistic investigation of the question of how and why reinforcement learning (RL) agents fail to develop planning communication in a cooperative setting. It is also a guide to anyone trying to build a system that learns to use planning communication patterns. We examine the state of the art in multi-agent systems and emergent communication for the existence of communication patterns that share information about future actions and plans. To do this, we strategically formulate hypotheses that question ...
Dissertation
Finite Element Simulations for the Design of Therapeutic Approaches for Retinal Diseases
(2022)
The retinal disease age-related macular degeneration is the most common cause of vision loss in industrialized countries. In this thesis, motivated by the drug (antibody) treatment of this disease, we designed long-term three dimensional Finite Element simulations of the drug distribution in the healthy human eye. The underlying model consists of a time-dependent convection-diffusion equation coupled to a stationary Darcy equation describing the flow of the aqueous humor through the vitreous medium. We replaced the ...
Dissertation
Attribute Exploration with Multiple Experts
(2023)
Attribute exploration is a knowledge acquisition method from the realm of formal concept analysis that allows a domain expert to efficiently uncover the dependencies in a domain. It is based on a question-answering scheme where the exploration algorithm generates questions about dependencies in the domain that are then answered by a domain expert. Even though many variants and extension to this were developed, only few attempts to incorporate multiple experts were made. The overarching goal of this thesis is to extend ...
Dissertation
Application of Temporal Airy Pulses for investigating the origin of Laser Induced Periodic Surface Structures and for developing new tools in cell surgery and malignant tissue identification
(2023)
In this thesis, ultrashort Temporal Airy Pulses are used to study Laser Induced Periodic Surface Structures (LIPSS) in Part I and to enable the photoinjection of fluorescent markers into single living cells in Part II, Chapter 8. In both cases, the laser pulse excites a dielectric material (fused silica and water) and the special spatio-temporal dynamics of the interaction of a Temporal Airy Pulse with the dielectric is exploited to extend the shape of the excited region along the axis of laser propagation. For the ...
Dissertation
Herausforderungen bei der Analyse von Unterrichtsqualität und deren Wirkungen auf Lernende
(2023-07)
Die empirische Unterrichtsforschung stellt Forschende vor zahlreiche Herausforderungen. Eine besondere Herausforderung besteht darin, dass wissenschaftliche Ergebnisse in hohem Maße von den Entscheidungen der Forschenden im Forschungsprozess abhängen – ein informiertes Vorgehen ist für jeden Schritt guter wissenschaftlicher Forschung fundamental. Ziel der kumulativen Dissertation ist es daher, aus einer Metaperspektive theoretisch-konzeptionelle Grundlagen und forschungsmethodische Fragen der Unterrichtsforschung zu ...