TY - THES A1 - Ertel, Florence Laura Louise T1 - Europapolitische Themen in Wahlkämpfen: Chancen und Herausforderungen der Anwendung von Blended Reading-Verfahren für die Europäische Integrationsforschung N2 - Durch fortschreitende Digitalisierung wächst die Verfügbarkeit digitaler Textdaten europapolitischer Diskurse. Gleichzeitig werden algorithmusbasierte Verfahren zur Analyse dieser großen Menge an Textdaten stetig weiterentwickelt. Für die europäische Integrationsforschung bietet die Vielfalt der Kommunikationsarten und -formen die Möglichkeit, gesellschaftliche, mediale und politische Diskurse zur europäischen Integration auf den verschiedensten Ebenen nachzuvollziehen. Chancen birgt dies insbesondere aus der integrationstheoretischen Perspektive des Postfunktionalismus. Dieser Ansatz rückt die vermehrte Politisierung der europäischen Integration in den Mittelpunkt. Denn mit der zunehmenden Vertiefung der europäischen Integration wächst zugleich der europäische Einfluss auf nationale Policies und wirkt sich immer unmittelbarer auf das Leben der Europäer:innen aus. Dies führt zu verstärkter Polarisierung und Mobilisierung innerhalb der Gesellschaft und spiegelt sich in einer wachsenden Spaltung zwischen proeuropäischen und antieuropäischen politischen Lagern wider. So werden Einstellung zur EU zu einer wichtigen strukturellen Spaltungslinie zwischen Parteien. Folgt man der GAL/TAN-These von Hooghe und Marks (2009), können Parteien in grüne, alternative, libertäre und grundsätzlich proeuropäische sowie traditionalistische, autoritäre, nationalistische und eher euroskeptische Parteien unterteilt werden. Letztere nutzen insbesondere digitale Kommunikationsräume verstärkt und effektiv. Dies unterstreicht die Notwendigkeit, Datengrundlagen für Analysen auf den digitalen Raum auszuweiten und zu archivieren, um den Diskurs in seiner Breite erfassen zu können. Mit der Menge an digital verfügbaren Textdaten wächst allerdings auch die Unübersichtlichkeit. Dies führt zu methodischen Herausforderungen in Bezug auf die Art der Daten, die Datensammlung und -speicherung sowie die Datenvorverarbeitung und -analyse. Angesichts großer Textdatenmengen stoßen in der europäischen Integrationsforschung übliche qualitative Analyseverfahren an ihre Grenzen. Quantitative Analyseverfahren verändern das Verhältnis von Textdatenmaterial und Forscher:in. Die wissenschaftliche Debatte setzt sich mit der Frage auseinander, wie sich Analysen angesichts der wachsenden Textdatenmengen gestaltet und steuern lassen, damit das Verhältnis von Textdatenmaterial und Forscher:in nicht durch Algorithmen, die einen Black-Box-Effekt in der Datenanalyse erzeugen können, verzerrt wird. Daraus ergibt sich die Notwendigkeit einer Verbindung von quantitativen und qualitativen Analysenmethoden auf epistemologischer und methodologischer Ebene, um reliable und valide Forschungsergebnisse zu gewährleisten. Dies impliziert die Überwindung der so häufig diskutierten Gegensätze von qualitativen und quantitative Analysen, datengeleiteten und theoriegeleiteten Analysen oder Close und Distant Reading. Allerdings existiert in der Politikwissenschaft bislang kein Best Practice-Workflow für die Analyse großer Textdatenmengen webbasierter Daten, mit dem intersubjektive Nachvollziehbarkeit und Reliabilität im Forschungsprozess gewährleistet werden können. An diese Forschungslücke knüpft die kumulative Dissertation an. In sechs aufeinander aufbauenden Publikationen in deutscher, englischer und französischer Sprache wird ein Best Practice-Workflow für Blended Reading entwickelt. Dieser Ansatz verbindet die Vorteile von quantitativer und qualitativer Forschung. Der starke methodische Schwerpunkt wird durch Fallstudien zu europäischen und nationalen Wahlkämpfen in Deutschland, Frankreich und Österreich kontextualisiert. Dafür wird die Rolle europapolitischer Themen in der Wahlkampfkommunikation der vergangenen zwei Jahrzehnte aus postfunktionalistischer Perspektive analysiert. Y1 - 2026 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:739-opus4-20504 ER - TY - THES A1 - Wirth, Olivia T1 - Digital Platforms and Mobile Technologies for Development: Essays on Firm Formalization, Financial Inclusion, and Agricultural Resilience in Sub-Saharan Africa N2 - Mobile technologies and digital platforms have expanded rapidly across sub-Saharan Africa, creating opportunities to strengthen state capacity, broaden financial inclusion, and build agricultural resilience. This dissertation examines their development impacts across three settings. Chapter 1 combines novel administrative tax records with high resolution data on mobile network rollout in Uganda to estimate the effects of mobile internet access on firm tax behavior and public revenue. Exploiting plausibly exogenous rollout timing, we find that improved access increases firm formalization and expands the tax base, strengthening revenue collection. Chapter 2 presents a randomized controlled trial in Niger—the world’s most financially excluded country—to identify barriers to adoption of a mobile money platform. Information provision raises awareness but not use, consistent with information being necessary but insufficient for diffusion. By contrast, a modest financial incentive significantly increases both adoption and usage. Chapter 3 uses a household panel collected before and after a severe drought in northern Ghana and exploits variation in rainfall in a differences-in-differences framework to estimate effects on production, income sources and adaptation plans. We find that increasing drought severity lowers soybean yields and revenues and decreases reliance on own-business income and remittances, reflecting broader livelihood impacts. Farmers who use mobile phones to access agricultural information make different input choices and adaptation plans. Taken together, these findings highlight the promise of mobile technologies and digital platforms for development. Their effectiveness, however, depends on complementary infrastructure and local capacity, underscoring the need for scalable, context-specific strategies to harness these tools for inclusive growth and resilience. KW - Digitalisierung KW - Mobilität KW - Landwirtschaft KW - Afrika Y1 - 2026 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:739-opus4-20049 ER - TY - THES A1 - Khosravi, Mohammad T1 - Hard Instances, Improved Algorithms and New Interdiction Models for Robust Optimization N2 - Robust combinatorial optimization seeks solutions that remain effective across all possible realizations of an uncertainty set, making the choice of this set a crucial factor in both the complexity and practical applicability of robust models. A key challenge in this field is striking a balance between computational tractability and solution quality, particularly when dealing with large uncertainty sets. This dissertation advances the field of robust optimization by addressing three central themes: (i) methods for generating hard instances and establishing a benchmark library, (ii) high-quality exact solution methods and approximation algorithms, and (iii) the modeling of uncertainty sets and their impact on problem complexity. The absence of a benchmark library for robust optimization problems makes it difficult to conduct fair and effective comparisons of different solution methods. As a result, researchers often rely on randomly generated instances, which may hinder meaningful evaluations. To address this issue, this work develops optimization-based and heuristic methods for generating challenging instances of robust problems. Additionally, to facilitate more consistent and insightful comparisons of solution algorithms with minimal effort, we introduce a standardized benchmark library for use by the research community. To tackle the computational challenges posed by large uncertainty sets, this dissertation proposes scenario reduction techniques specifically designed for robust optimization. These methods aim to reduce the size of the uncertainty set while preserving the objective value as accurately as possible. Unlike traditional clustering approaches, this formulation treats scenario reduction as an optimization problem independent of the underlying decision-making model, enabling structured reductions with theoretical performance guarantees. Experimental results demonstrate that this approach produces solutions of comparable or superior quality compared to those obtained through general-purpose clustering techniques. Building on this framework, we further refine scenario reduction by incorporating information about the structure of feasible solutions. While previous reduction methods focused exclusively on the uncertainty set, we show that integrating knowledge of feasible solutions leads to improved uncertainty sets and more accurate robust models. Through a combination of theoretical analysis and computational experiments, we establish the effectiveness of this approach in enhancing both tractability and solution quality in robust combinatorial optimization. Finally, we introduce a novel variant of discrete budgeted uncertainty for cardinality-based constraints or objectives, incorporating a weight vector into the budget constraint. Our theoretical analysis reveals that while the adversarial problem can be solved in linear time, the robust problem becomes NP-hard and non-approximable. Nonetheless, we propose and evaluate alternative modeling approaches that demonstrate promising scalability in practice. This dissertation contributes to robust optimization by offering new perspectives on uncertainty modeling, algorithmic techniques for scenario reduction, and complexity analyses of key robust problems. The proposed methods provide both theoretical guarantees and practical advancements, paving the way for more efficient and scalable robust optimization models. Y1 - 2026 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:739-opus4-20399 ER - TY - JOUR A1 - Bauer, Matthias A1 - Rössler, Reto A1 - Kasper, Nils A1 - Ernst, Christoph ED - Bauer, Matthias ED - Rössler, Reto ED - Nies, Martin T1 - Diagrammatische Praktiken N2 - Indem die Aufsätze von Nils Kasper, Christoph Ernst, Reto Rössler und Matthias Bauer sowohl wissens- und kulturgeschichtliche als auch medien- und verfahrenstechnische Fragestellungen behandeln, zeigen sie in ihrer Komplementarität das Spektrum an Denk- und Handlungsmöglichkeiten auf, das Diagramme bzw. diagrammatische Praktiken eröffnen. T3 - Schriften zur Kultur- und Mediensemiotik | Online - 14 KW - Diagrammatik KW - Projektion KW - Medienwandel KW - Heuristik KW - Grounded Theory Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:739-opus4-20417 VL - 2025 IS - 14 ER - TY - GEN A1 - Weithmann, Michael T1 - Passau und das Nibelungenlied T2 - Altbayerische Heimatpost : Leben und Erleben in Bayern 27/2025 N2 - The Nibelungenlied is an epic poem written around 1200 in Middle High German. Its anonymous poet was likely from the region of Passau. The current theory of the creation of the poem emphasizes the poet's concentration on the region of Passau: for example, the poem highlights the relatively unimportant figure of Bishop Pilgrim of Passau, and the poet's geographical knowledge appears much more firm in this region than elsewhere. These facts, combined with the dating, have led scholars to believe that Wolfger von Erla, Bishop of Passau (reigned 1191–1204) was the patron of the poem. KW - Nibelungenlied KW - Passau Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:739-opus4-20349 VL - 2025 IS - 27 SP - 10 EP - 12 PB - Passauer Neue Presse CY - Passau ER - TY - JOUR A1 - Harendarski, Ulf A1 - Briese, Joschka A1 - Hallmann, Tiziana A1 - Dettmann, Luc A1 - Kitzerow, Tom ED - Harendarski, Ulf ED - Briese, Joschka T1 - Kraft und Signifikanz BT - kultursemiotische Betrachtungen alltäglicher Darstellungen in der sprachbasierten Semiose N2 - Zuerst erschienen auf: https://www.kultursemiotik.com/forschung/publikationen/schriftenreihe-online/ Inhalt Vorwort Kraft und Signifikanz. Kultursemiotische Betrachtungen alltäglicher Darstellungen in der sprachbasierten Semiose Ulf Harendarski und Joschka Briese Signifikanz der Melancholie Zur diskursiven Konstitution Leonard Cohens Tiziana Hallmann Von gefallenen Helden Mythologische Umschriften und ihre semiotisierende Kraft Luc Dettmann Sprachliche Konstitutionen von Drittpersonalität Eine semantisch/pragmatische Analyse von distanzmarkierenden Verben in drittpersonalen Aussagen öffentlicher Texte Tom Kitzerow Spuren diskursiver Interpretationsprozesse Für ein elaboriertes Konzept von Signifikanz Joschka Briese Impressum T3 - Schriften zur Kultur- und Mediensemiotik | Online - 13 KW - Semiose KW - Diskurs KW - Mythos Y1 - 2024 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:739-opus4-20388 VL - 2024 IS - 13 ER - TY - THES A1 - Rolvering, Geske T1 - Empirical Essays in Public Economics N2 - This dissertation exploits quasi-experimental methods and rich microdata to identify causal effects of public interventions that speak directly to the goals outlined in the 2030 Agenda for Sustainable Development. Specifically, the first chapter analyzes the effect of public child care provision on mothers’ career trajectories, focusing on the timing of labor market re-entry and the quality of occupational outcomes. It thereby contributes to the Sustainable Development Goals of "Gender Equality", "Reducing Inequalities", and "Decent Work and Economic Growth". The second chapter investigates the impact of all-day school programs on juvenile property, violent, and drug-related crime. By providing evidence on how school schedules can be structured to promote safe learning environments, it contributes in particular to the goal of "Quality Education". In addition, it also contributes to broader objectives related to "Good Health and Well-Being" as well as "Peace, Justice and Strong Institutions". The third chapter examines public attitudes toward climate change and carbon pricing in Germany and analyzes whether different types of information shift people’s policy views. By exploring measures to reduce resistance to effective but politically unpopular environmental policies, this chapter contributes to the goal of "Climate Action". KW - Public Economics KW - Applied Microeconomics Y1 - 2026 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:739-opus4-20186 ER - TY - JOUR A1 - Lukas, Wolfang A1 - Brehm, David A1 - Durdel, Patrick A1 - Papart, Sönke A1 - Kreuter, Sara A1 - Weinbach, Donata A1 - Pfeifer, Lena A1 - Assadsolimani, Jasmin A1 - Wagner, Alexander ED - Lukas, Wolfgang ED - Nies, Martin T1 - Zeichen des Fremden BT - und ihre Metaisierung in ästhetischen Diskursen der Gegenwart N2 - Zuerst erschienen auf: https://www.kultursemiotik.com/forschung/publikationen/schriftenreihe-online/ Inhalt Zeichen des Fremden Einleitung Wolfgang Lukas / Martin Nies Wessen Rettung? Geflüchtete Figuren, Sinnproduktion und implizite Poetik in Jenny Erpenbecks 'Gehen, ging, gegangen' und Bodo Kirchhoffs 'Widerfahrnis' David Brehm Der falsche Fremde Auto- und metafiktionale Reflexionen von Identität und Ethnizität in Abbas Khiders 'Der falsche Inder' Sönke Parpart „Ich habe kein Bild mehr von mir“ (De-)Konstruktion von Identität und Fremdheit in Jenny Erpenbecks 'Gehen, ging, gegangen' (2015) und Olga Grjasnowas 'Gott ist nicht schüchtern' (2018) Sara Kreuter Verfinsterungen des Eigenen Konstruktionen des Anderen in Wolfram Lotz’ 'Die lächerliche Finsternis' Patrick Durdel Die vertraute Fremdheit der Anthropophagie Franzobels 'Floß der Medusa' (2017) Donata Weinbach Intimate Weavings Tracing Urban and Corporeal Others in Sinéad Morrissey’s Poetry Lena Pfeifer Make America en vogue again Die Konstruktion einer nationalen Identität in der US-amerikanischen Vogue nach dem Trump-Wahlsieg Jasmin Assadsolimani Schweiz / Haiti / NEW WORLD PLAZA Individualgeschichte und Universalgeschichte in Dorothee Elmigers 'Aus der Zuckerfabrik' Alexander Wagner T3 - Schriften zur Kultur- und Mediensemiotik | Online - 9 KW - Einwanderung KW - Kulturelle Identität KW - Fremdheit KW - Gegenwartsliteratur Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:101:1-2023081602100461706063 VL - 2023 IS - 9 ER - TY - THES A1 - Hosseini, Amir T1 - Integrated Scheduling and Material Handling: Theory and Applications in Manufacturing Systems N2 - Scheduling concerns the allocation of limited resources to competing tasks over time and is central to manufacturing systems. In practice, production scheduling is tightly linked to material handling, as jobs must be transported between machines, buffers, and storage locations. However, transportation decisions have often been simplified or decoupled from classical scheduling models. This dissertation investigates the problem of Integrated Scheduling and Material Handling (ISMH), where processing and transportation decisions are jointly optimized to improve overall system performance. The thesis develops this objective in three steps. First, it provides a structured and unified classification of scheduling problems with transportation elements, organizing a fragmented body of literature and clarifying methodological foundations. Second, it studies scheduling in AGV-based material handling systems under battery constraints, proposing a novel mixed-integer programming formulation and an exact solution approach based on logic-based Benders decomposition. Third, it extends integrated models to a buffer-constrained flow shop setting with mobile buffering, introducing a decomposition-based algorithm that significantly improves scalability. Together, these contributions advance conceptual understanding, modeling frameworks, and exact solution methods for integrated production and internal logistics planning in modern manufacturing systems. KW - Scheduling KW - Material Handling KW - Mixed Integer Programming-MIP KW - Logic Based Benders Decomposition Y1 - 2026 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:739-opus4-20249 ER - TY - INPR A1 - Wehner, Stefanie T1 - Regional and gendered aspects of migration: Data-exploration from a multi-local field survey in Ghana (Northern, Eastern and Greater Accra Region) N2 - This study assesses the perception of migrants and migrant households on drivers and structures of translocal mobility and their consequences for livelihoods in Ghana. A bi-local survey was conducted to collect data on households and migrants in the area of origin (AoO) and individuals in the area of destination (AoD). The survey at the AoO was conducted in two research areas (Gushiegu Municipal District in the Northern Region and Fanteakwa District in the Eastern Region). Thesample then covered 75% migrant households and 25% non-migrant households, both randomly selected. The collected data provides information on almost 1,000 migrants and 2,000 non-migrants. Since Greater Accra Region was identified as one major destination, this region was selected as an Area of Destination. In Accra, 50 migrants from Eastern and Northern Region each were randomly selected from the previous survey database. The perception of migrant households and migrants themselves on migration was assessed using descriptive statistics. Over 95% said migration is essential to secure their livelihood and that migration improves the standard of living of the households. The study elucidates the challenges encountered by rural households in agriculture and the strategies implemented to address these issues. The predominant challenges confronting farmers include the escalating costs of agricultural inputs, the prevalence of pests and diseases, and fluctuations in environmental conditions. Moreover, the research highlights robust translocal networks that extend beyond mere financial remittances, encompassing an intangible web of communication, emotions, and aspirations. By traversing spatial and gender dimensions, the study unveils the extensive diversity of migration aspects, demonstrating that migration exerts markedly different impacts on women compared to men and has varying implications for households in the Northern Region versus the Eastern Region. It is evident that female migrants from Northern Ghana constitute the most vulnerable group, grappling with severe food insecurity. In contrast, translocal networks in the Eastern Region facilitate families in leveraging remittances for diversification of their economic base, thereby enhancing their capacity for future development, while those in the Northern region are essential for addressing the existential needs of families. T3 - Migration, translocality and development in times of climate change. Mitra|WA Working Paper Series - 7 KW - migration KW - area of origin KW - area of destination KW - livelihood KW - remittances KW - food security Y1 - 2026 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:739-opus4-20299 ER -