@book{WeissVerlaanVasquezCarruthersetal.2022, author = {Weiß, Norman and Verlaan, Stephanie and Vasquez Carruthers, Juan Francisco and Mair, Theresa and Conner, Sean and Maaser, Lucas and R{\"o}thlisberger, Livia}, title = {Transitional Justice}, series = {Potsdamer Studien zu Staat, Recht und Politik}, journal = {Potsdamer Studien zu Staat, Recht und Politik}, number = {7}, editor = {Weiß, Norman}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-473-9}, issn = {1869-2443}, doi = {10.25932/publishup-43171}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-431711}, publisher = {Universit{\"a}t Potsdam}, pages = {194}, year = {2022}, abstract = {This publication deals with the topic of transitional justice. In six case studies, the authors link theoretical and practical implications in order to develop some innovative approaches. Their proposals might help to deal more effectively with the transition of societies, legal orders and political systems. Young academics from various backgrounds provide fresh insights and demonstrate the relevance of the topic. The chapters analyse transitions and conflicts in Sierra Leone, Argentina, Nicaragua, Nepal, and South Sudan as well as Germany's colonial genocide in Namibia. Thus, the book provides the reader with new insights and contributes to the ongoing debate about transitional justice.}, language = {en} } @misc{TjadenHaarmannSavaskan2022, author = {Tjaden, Jasper and Haarmann, Esther and Savaskan, Nicolai}, title = {Experimental evidence on improving COVID-19 vaccine outreach among migrant communities on social media}, series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Wirtschafts- und Sozialwissenschaftliche Reihe}, journal = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Wirtschafts- und Sozialwissenschaftliche Reihe}, number = {156}, issn = {1867-5808}, doi = {10.25932/publishup-58740}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-587409}, pages = {10}, year = {2022}, abstract = {Studies from several countries suggest that COVID-19 vaccination rates are lower among migrants compared to the general population. Urgent calls have been made to improve vaccine outreach to migrants, however, there is limited evidence on effective approaches, especially using social media. We assessed a targeted, low-cost, Facebook campaign disseminating COVID-19 vaccine information among Arabic, Turkish and Russian speakers in Germany (N = 888,994). As part of the campaign, we conducted two randomized, online experiments to assess the impact of the advertisement (1) language and (2) depicted messenger (government authority, religious leader, doctor or family). Key outcomes included reach, click-through rates, conversion rates and cost-effectiveness. Within 29 days, the campaign reached 890 thousand Facebook users. On average, 2.3 individuals accessed the advertised COVID-19 vaccination appointment tool for every euro spent on the campaign. Migrants were 2.4 (Arabic), 1.8 (Russian) and 1.2 (Turkish) times more likely to click on advertisements translated to their native language compared to German-language advertisements. Furthermore, findings showed that government representatives can be more successful in engaging migrants online compared to other messengers, despite common claims of lower trust in government institutions among migrants. This study highlights the potential of tailored, and translated, vaccination campaigns on social media for reaching migrants who may be left out by traditional media campaigns.}, language = {en} } @misc{Hammann2022, type = {Master Thesis}, author = {Hammann, Angelika}, title = {L'initiative « Universit{\´e}s Europ{\´e}ennes »}, doi = {10.25932/publishup-54168}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-541681}, school = {Universit{\"a}t Potsdam}, pages = {XXI, 73}, year = {2022}, abstract = {Le Pr{\´e}sident de la R{\´e}publique fran{\c{c}}aise, Emmanuel Macron, a prononc{\´e} le 26 septembre 2017 dans le grand auditorium de l'Universit{\´e} de la Sorbonne devant un public compos{\´e} d'{\´e}tudiants et de responsables politiques un ambitieux discours sur l'Europe. Parmi ses « initiatives pour l'Europe » figure la cr{\´e}ation d'universit{\´e}s europ{\´e}ennes. L'objectif de cette {\´e}tude est de mettre en lumi{\`e}re l'h{\´e}ritage et les apports fran{\c{c}}ais et allemands dans ce nouveau mod{\`e}le de partenariat europ{\´e}en en construction. Quel est le r{\^o}le jou{\´e} par le niveau minist{\´e}riel en France et en Allemagne dans le cadre de la mise en œuvre de l'initiative ? Quel est le degr{\´e} et quelle est la nature d'intervention des Agences nationales Erasmus dans chacun des deux pays ? Quel est le positionnement de l'Universit{\´e} franco-allemande par rapport {\`a} ces nouvelles alliances ainsi que sa contribution ? {\`A} partir de trois exemples, {\`a} savoir les alliances ECIU, EPICUR et FORTHM, nous illustrons comment la coop{\´e}ration franco-allemande ainsi que les relations transfrontali{\`e}res d{\´e}velopp{\´e}es au sein de r{\´e}seaux pr{\´e}existants alimentent ces « r{\´e}seaux des r{\´e}seaux ». Ce m{\´e}moire puise ses principales sources de 15 entretiens semi-directifs, men{\´e}s entre ao{\^u}t 2020 et janvier 2021 aupr{\`e}s d'acteurs allemands, fran{\c{c}}ais et europ{\´e}ens. La richesse de leur expertise nourrit la conclusion dans laquelle nous tentons de mettre en exergue la dimension franco-allemande de cette initiative. Avec un regard franco-allemand, nous proposons un r{\´e}sum{\´e} des actuelles forces, opportunit{\´e}s, faiblesses et menaces qui favorisent ou entravent le d{\´e}veloppement de cette nouvelle initiative. Der Pr{\"a}sident der franz{\"o}sischen Republik, Emmanuel Macron, hielt am 26. September 2017 im großen H{\"o}rsaal der Universit{\"a}t Sorbonne vor einem Publikum aus Studenten und Politikern eine ambitionierte Rede zu Europa. Zu seinen "Initiativen f{\"u}r Europa" geh{\"o}rt die Schaffung von Europ{\"a}ischen Hochschulnetzwerken. Das Ziel dieser Masterarbeit besteht darin, das deutsch-franz{\"o}sische Erbe sowie die Beitr{\"a}ge beider L{\"a}nder in diesen neuen Modellen zu untersuchen :.Welche Rolle spielt die ministerielle Ebene in Frankreich und Deutschland bei der Umsetzung der Initiative? In welchem Umfang und auf welche Art und Weise beteiligen sich die nationalen Erasmus-Agenturen in beiden L{\"a}ndern ? Welche Position nimmt die Deutsch-Franz{\"o}sische Hochschule in Bezug auf diese neuen Allianzen ein und welche Unterst{\"u}tzung bietet sie? Anhand von drei Beispielen, den Allianzen ECIU, EPICUR und FORTHM, wird beschrieben, welche Beitr{\"a}ge die deutsch-franz{\"o}sische Zusammenarbeit sowie grenz{\"u}berschreitende Kooperationen leisten. Die Hauptquellen f{\"u}r diese Masterarbeit stellen 15 semidirektive Experteninterviews dar, die zwischen August 2020 und Januar 2021 mit deutschen, franz{\"o}sischen und europ{\"a}ischen Akteuren gef{\"u}hrt wurden. Der Reichtum ihrer Expertise fließt in die Schlussfolgerung ein, in der wir versuchen, die deutsch-franz{\"o}sische Dimension dieser Initiative hervorzuheben. Mit einer deutsch-franz{\"o}sischen Perspektive versuchen wir, die St{\"a}rken, Chancen, Schw{\"a}chen und Bedrohungen zusammenzufassen, die die Entwicklung dieser neuen Initiative beg{\"u}nstigen oder behindern. The President of the French Republic, Emmanuel Macron, gave an ambitious speech on Europe to an audience of students and politicians in the large lecture hall of the Sorbonne University on 26 September 2017. Among his "Initiatives for Europe" is the creation of European University Networks. The aim of this Master's thesis is to examine the Franco-German heritage and the contributions of both countries in these new models :.What is the role of the ministerial level in France and Germany in the implementation of the initiative? To what extent and in what way do the national Erasmus agencies in both countries participate ? What is the position of the Franco-German University in relation to these new alliances and what support does it offer? Using three examples, the ECIU, EPICUR and FORTHM alliances, the contributions of Franco-German cooperation and cross-border cooperation are described. The main sources for this Master's thesis are 15 semi-directive expert interviews conducted with German, French and European actors between August 2020 and January 2021. The wealth of their expertise feeds into the conclusion, in which we try to highlight the Franco-German dimension of this initiative. With a Franco-German perspective, we try to summarise the strengths, opportunities, weaknesses and threats that favour or hinder the development of this new initiative.}, language = {fr} } @phdthesis{Dreseler2022, author = {Dreseler, Markus}, title = {Automatic tiering for in-memory database systems}, doi = {10.25932/publishup-55825}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-558253}, school = {Universit{\"a}t Potsdam}, pages = {vii, 143}, year = {2022}, abstract = {A decade ago, it became feasible to store multi-terabyte databases in main memory. These in-memory databases (IMDBs) profit from DRAM's low latency and high throughput as well as from the removal of costly abstractions used in disk-based systems, such as the buffer cache. However, as the DRAM technology approaches physical limits, scaling these databases becomes difficult. Non-volatile memory (NVM) addresses this challenge. This new type of memory is persistent, has more capacity than DRAM (4x), and does not suffer from its density-inhibiting limitations. Yet, as NVM has a higher latency (5-15x) and a lower throughput (0.35x), it cannot fully replace DRAM. IMDBs thus need to navigate the trade-off between the two memory tiers. We present a solution to this optimization problem. Leveraging information about access frequencies and patterns, our solution utilizes NVM's additional capacity while minimizing the associated access costs. Unlike buffer cache-based implementations, our tiering abstraction does not add any costs when reading data from DRAM. As such, it can act as a drop-in replacement for existing IMDBs. Our contributions are as follows: (1) As the foundation for our research, we present Hyrise, an open-source, columnar IMDB that we re-engineered and re-wrote from scratch. Hyrise enables realistic end-to-end benchmarks of SQL workloads and offers query performance which is competitive with other research and commercial systems. At the same time, Hyrise is easy to understand and modify as repeatedly demonstrated by its uses in research and teaching. (2) We present a novel memory management framework for different memory and storage tiers. By encapsulating the allocation and access methods of these tiers, we enable existing data structures to be stored on different tiers with no modifications to their implementation. Besides DRAM and NVM, we also support and evaluate SSDs and have made provisions for upcoming technologies such as disaggregated memory. (3) To identify the parts of the data that can be moved to (s)lower tiers with little performance impact, we present a tracking method that identifies access skew both in the row and column dimensions and that detects patterns within consecutive accesses. Unlike existing methods that have substantial associated costs, our access counters exhibit no identifiable overhead in standard benchmarks despite their increased accuracy. (4) Finally, we introduce a tiering algorithm that optimizes the data placement for a given memory budget. In the TPC-H benchmark, this allows us to move 90\% of the data to NVM while the throughput is reduced by only 10.8\% and the query latency is increased by 11.6\%. With this, we outperform approaches that ignore the workload's access skew and access patterns and increase the query latency by 20\% or more. Individually, our contributions provide novel approaches to current challenges in systems engineering and database research. Combining them allows IMDBs to scale past the limits of DRAM while continuing to profit from the benefits of in-memory computing.}, language = {en} } @phdthesis{Hain2022, author = {Hain, Tobias Martin}, title = {Structure formation and identification in geometrically driven soft matter systems}, doi = {10.25932/publishup-55880}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-558808}, school = {Universit{\"a}t Potsdam}, pages = {xviii, 171}, year = {2022}, abstract = {Subdividing space through interfaces leads to many space partitions that are relevant to soft matter self-assembly. Prominent examples include cellular media, e.g. soap froths, which are bubbles of air separated by interfaces of soap and water, but also more complex partitions such as bicontinuous minimal surfaces. Using computer simulations, this thesis analyses soft matter systems in terms of the relationship between the physical forces between the system's constituents and the structure of the resulting interfaces or partitions. The focus is on two systems, copolymeric self-assembly and the so-called Quantizer problem, where the driving force of structure formation, the minimisation of the free-energy, is an interplay of surface area minimisation and stretching contributions, favouring cells of uniform thickness. In the first part of the thesis we address copolymeric phase formation with sharp interfaces. We analyse a columnar copolymer system "forced" to assemble on a spherical surface, where the perfect solution, the hexagonal tiling, is topologically prohibited. For a system of three-armed copolymers, the resulting structure is described by solutions of the so-called Thomson problem, the search of minimal energy configurations of repelling charges on a sphere. We find three intertwined Thomson problem solutions on a single sphere, occurring at a probability depending on the radius of the substrate. We then investigate the formation of amorphous and crystalline structures in the Quantizer system, a particulate model with an energy functional without surface tension that favours spherical cells of equal size. We find that quasi-static equilibrium cooling allows the Quantizer system to crystallise into a BCC ground state, whereas quenching and non-equilibrium cooling, i.e. cooling at slower rates then quenching, leads to an approximately hyperuniform, amorphous state. The assumed universality of the latter, i.e. independence of energy minimisation method or initial configuration, is strengthened by our results. We expand the Quantizer system by introducing interface tension, creating a model that we find to mimic polymeric micelle systems: An order-disorder phase transition is observed with a stable Frank-Caspar phase. The second part considers bicontinuous partitions of space into two network-like domains, and introduces an open-source tool for the identification of structures in electron microscopy images. We expand a method of matching experimentally accessible projections with computed projections of potential structures, introduced by Deng and Mieczkowski (1998). The computed structures are modelled using nodal representations of constant-mean-curvature surfaces. A case study conducted on etioplast cell membranes in chloroplast precursors establishes the double Diamond surface structure to be dominant in these plant cells. We automate the matching process employing deep-learning methods, which manage to identify structures with excellent accuracy.}, language = {en} } @phdthesis{Šedova2022, author = {Šedov{\´a}, Barbora}, title = {Heterogeneous effects of weather and climate change on human migration}, doi = {10.25932/publishup-53673}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-536733}, school = {Universit{\"a}t Potsdam}, pages = {xix, 284}, year = {2022}, abstract = {While estimated numbers of past and future climate migrants are alarming, the growing empirical evidence suggests that the association between adverse climate-related events and migration is not universally positive. This dissertation seeks to advance our understanding of when and how climate migration emerges by analyzing heterogeneous climatic influences on migration in low- and middle-income countries. To this end, it draws on established economic theories of migration, datasets from physical and social sciences, causal inference techniques and approaches from systematic literature review. In three of its five chapters, I estimate causal effects of processes of climate change on inequality and migration in India and Sub-Saharan Africa. By employing interaction terms and by analyzing sub-samples of data, I explore how these relationships differ for various segments of the population. In the remaining two chapters, I present two systematic literature reviews. First, I undertake a comprehensive meta-regression analysis of the econometric climate migration literature to summarize general climate migration patterns and explain the conflicting findings. Second, motivated by the broad range of approaches in the field, I examine the literature from a methodological perspective to provide best practice guidelines for studying climate migration empirically. Overall, the evidence from this dissertation shows that climatic influences on human migration are highly heterogeneous. Whether adverse climate-related impacts materialize in migration depends on the socio-economic characteristics of the individual households, such as wealth, level of education, agricultural dependence or access to adaptation technologies and insurance. For instance, I show that while adverse climatic shocks are generally associated with an increase in migration in rural India, they reduce migration in the agricultural context of Sub-Saharan Africa, where the average wealth levels are much lower so that households largely cannot afford the upfront costs of moving. I find that unlike local climatic shocks which primarily enhance internal migration to cities and hence accelerate urbanization, shocks transmitted via agricultural producer prices increase migration to neighboring countries, likely due to the simultaneous decrease in real income in nearby urban areas. These findings advance our current understanding by showing when and how economic agents respond to climatic events, thus providing explicit contexts and mechanisms of climate change effects on migration in the future. The resulting collection of findings can guide policy interventions to avoid or mitigate any present and future welfare losses from climate change-related migration choices.}, language = {en} } @article{Ette2022, author = {Ette, Ottmar}, title = {Alexander von Humboldt im Archiv}, series = {HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies}, volume = {XXIII}, journal = {HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies}, number = {45}, editor = {Ette, Ottmar and Knobloch, Eberhard}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {2568-3543}, doi = {10.25932/publishup-59232}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-592326}, pages = {13 -- 28}, year = {2022}, abstract = {Der Aufsatz erschließt die Anf{\"a}nge, Ergebnisse und Erfolge der editionsphilologischen Arbeit im laufenden Projekt des BBAW-Langzeitvorhabens „Alexander von Humboldt auf Reisen - Wissenschaft aus der Bewegung" und gibt einen {\"U}berblick {\"u}ber die Zuk{\"u}nfte philologischen Arbeitens mit den Methoden der Digital Humanities. Dabei werden auch bibliophile Druckausgaben digitaler Publikationen und die kontinuierliche {\"O}ffentlichkeitsarbeit der Figur Alexander von Humboldts in den Blick genommen, was durch zahlreiche Vernetzungen zwischen Institutionen international gef{\"o}rdert und durch kontinuierliche Kooperationen insbesondere durch das neu gegr{\"u}ndete Humboldt Center for Transdisciplinary Studies (HCTS) in China/Changsha erweitert wird. Diskutiert wird die wissenschaftliche Bedeutung der graphischen und visuellen Dimension des Humboldt'schen Archivs, die durch die digitale Aufbereitung des Materials Forscher:innen weltweit miteinander verbindet und neue Forschungskonzepte er{\"o}ffnet.}, language = {de} } @misc{Lorenz2022, type = {Master Thesis}, author = {Lorenz, Theo}, title = {Entwicklung eines Konzepts zur Umsetzung des SAMR-Modells im Geographieunterricht}, series = {Potsdamer Geographische Praxis}, journal = {Potsdamer Geographische Praxis}, number = {17}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-540-8}, issn = {2194-1599}, doi = {10.25932/publishup-53846}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-538462}, school = {Universit{\"a}t Potsdam}, pages = {87}, year = {2022}, abstract = {Die Gesellschaft befindet sich l{\"a}ngst in einem digitalen Transformationsprozess. Alle gesellschaftlichen Bereiche ver{\"a}ndern sich. Man spricht von einer Kultur der Digitalit{\"a}t, die den Leitmedienwechsel vom gedruckten Buch hin zum vernetzten digitalen Endger{\"a}t beschreibt. Auch die Institution „Schule" muss sich diesem Wandel {\"o}ffnen. Einen wesentlichen Schritt stellt das Strategiepapier der Kultusministerkonferenz „Bildung in der digitalen Welt" aus dem Jahr 2017 dar. Darin legt sie die wesentlichen Handlungsfelder zu einem digitalen Wandel fest und erweitert den Bildungsauftrag um die „Kompetenzen in der digitalen Welt". Das sog. SAMR-Modell stellt dabei ein geeignetes Umsetzungs- und Reflektionswerkzeug f{\"u}r den Einsatz digitaler Medien dar. Es strukturiert den Einsatz auf vier Stufen. Die beiden unteren Stufen (Substitution und Augmentation) schreiben der Art und Weise, wie die digitalen Medien genutzt werden, eine Ersatz- oder Verbesserungsfunktion des analogen Lernwerkzeuges zu. Ziel des Modells ist es aber, mithilfe hinzugewonnener digitaler M{\"o}glichkeiten, Lernen neu zu gestalten. Da das Modell aus den USA stammt, weist es weder direkten Bez{\"u}ge zum Strategiepapier der Kultusministerkonferenz noch zu den Bildungsstandards der Geographie auf. Diese wissenschaftliche Arbeit stellt diese Bez{\"u}ge her. Ziel ist es, auf der Grundlage des SAMR-Modells ein Handlungskonzept f{\"u}r Geographielehrkr{\"a}fte zu entwickeln. Es zeigt auf, wie sie sowohl fachliche Kompetenzen als auch Kompetenzen in der digitalen Welt systematisch bei den Lernenden f{\"o}rdern k{\"o}nnen.}, language = {de} } @phdthesis{Sojka2022, author = {S{\´o}jka, Pia}, title = {Writing travel, writing life}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-537-8}, issn = {2629-2548}, doi = {10.25932/publishup-55879}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-558799}, school = {Universit{\"a}t Potsdam}, pages = {319}, year = {2022}, abstract = {The book compares the texts of three Swiss authors: Ella Maillart, Annemarie Schwarzenbach and Nicolas Bouvier. The focus is on their trip from Gen{\`e}ve to Kabul that Ella Maillart and Annemarie Schwarzenbach made together in 1939/1940 and Nicolas Bouvier 1953/1954 with the artist Thierry Vernet. The comparison shows the strong connection between the journey and life and between ars vivendi and travel literature. This book also gives an overview of and organises the numerous terms, genres, and categories that already exist to describe various travel texts and proposes the new term travelling narration. The travelling narration looks at the text from a narratological perspective that distinguishes the author, narrator, and protagonist within the narration. In the examination, ten motifs could be found to characterise the travelling narration: Culture, Crossing Borders, Freedom, Time and Space, the Aesthetics of Landscapes, Writing and Reading, the Self and/as the Other, Home, Religion and Spirituality as well as the Journey. The importance of each individual motif does not only apply in the 1930s or 1950s but also transmits important findings for living together today and in the future.}, language = {en} } @phdthesis{Villamizar2022, author = {Villamizar, Natalia}, title = {Heimat}, number = {4}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-530-9}, issn = {2629-2548}, doi = {10.25932/publishup-54108}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-541086}, school = {Universit{\"a}t Potsdam}, pages = {191}, year = {2022}, abstract = {Esta investigaci{\´o}n propone un estudio transareal de las series autoficcionales del escritor austriaco Thomas Bernhard y el colombiano Fernando Vallejo, dos autores cuya obra se caracteriza por una dura cr{\´i}tica a sus pa{\´i}ses de origen, a sus Heimaten, pero tambi{\´e}n por un complejo arraigamiento. Los an{\´a}lisis interpretativos demuestran que en Die Autobiographie y El r{\´i}o del tiempo la Heimat se presenta como un constructo que abarca no solamente elementos dichosos, sino que presenta tambi{\´e}n elementos negativos, disolutivos, destructivos, con lo cual ambos autores de distancian de una concepci{\´o}n tradicional de Heimat como territorio necesariamente arm{\´o}nico al que el sujeto se siente positivamente vinculado. En cambio, ella se concibe como un conjunto dis{\´i}mil, frente al cual el sujeto se relaciona, necesariamente, de modo ambivalente y problem{\´a}tico. En ambos autores la narraci{\´o}n literaria se configura como un acto en el que no simplemente se representa esa ambivalencia, sino en el que, sobre todo, se impugnan las formas de hostilidad que le confieren a la Heimat su car{\´a}cter inh{\´o}spito. Para ello, ambos autores recurren a la implementaci{\´o}n de dos recursos fundamentales: la m{\´i}mesis y el movimiento. La investigaci{\´o}n muestra de qu{\´e} manera las obras estudiadas la Heimat se presenta como un espacio de continuos movimientos, intercambios e interacciones, en el que act{\´u}an mecanismos de opresi{\´o}n, pero tambi{\´e}n dispositivos de oposici{\´o}n, pr{\´a}cticas de apertura intersubjetiva y aspiraciones de integraci{\´o}n comunitaria.}, language = {es} }