@article{Heinemann2020, author = {Heinemann, Maik}, title = {Zyklische Ph{\"a}nomene in der {\"O}konomie - Ein Einblick in dei Theorie und Empirie konjunktureller Schwankungen}, series = {Zyklizit{\"a}t \& Rhythmik: eine multidisziplin{\"a}re Vorlesungsreihe}, journal = {Zyklizit{\"a}t \& Rhythmik: eine multidisziplin{\"a}re Vorlesungsreihe}, publisher = {trafo}, address = {Berlin}, isbn = {978-3-86464-169-5}, pages = {47 -- 69}, year = {2020}, language = {de} } @techreport{SultanowKochCox2019, author = {Sultanow, Eldar and Koch, Christian and Cox, Sean}, title = {Collatz Sequences in the Light of Graph Theory}, edition = {2nd version}, doi = {10.25932/publishup-43741}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-437416}, pages = {21}, year = {2019}, abstract = {The Collatz conjecture is a number theoretical problem, which has puzzled countless researchers using myriad approaches. Presently, there are scarcely any methodologies to describe and treat the problem from the perspective of the Algebraic Theory of Automata. Such an approach is promising with respect to facilitating the comprehension of the Collatz sequence's "mechanics". The systematic technique of a state machine is both simpler and can fully be described by the use of algebraic means. The current gap in research forms the motivation behind the present contribution. The present authors are convinced that exploring the Collatz conjecture in an algebraic manner, relying on findings and fundamentals of Graph Theory and Automata Theory, will simplify the problem as a whole.}, language = {en} } @techreport{SultanowKochCox2019, author = {Sultanow, Eldar and Koch, Christian and Cox, Sean}, title = {Collatz Sequences in the Light of Graph Theory}, doi = {10.25932/publishup-43008}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-430089}, pages = {15}, year = {2019}, abstract = {The Collatz conjecture is a number theoretical problem, which has puzzled countless researchers using myriad approaches. Presently, there are scarcely any methodologies to describe and treat the problem from the perspective of the Algebraic Theory of Automata. Such an approach is promising with respect to facilitating the comprehension of the Collatz sequences "mechanics". The systematic technique of a state machine is both simpler and can fully be described by the use of algebraic means. The current gap in research forms the motivation behind the present contribution. The present authors are convinced that exploring the Collatz conjecture in an algebraic manner, relying on findings and fundamentals of Graph Theory and Automata Theory, will simplify the problem as a whole.}, language = {en} } @article{Heinzel2022, author = {Heinzel, Mirko Noa}, title = {International bureaucrats and organizational performance}, series = {International Studies Quarterly}, volume = {66}, journal = {International Studies Quarterly}, number = {2}, publisher = {Oxford University Press}, address = {Oxford}, issn = {0020-8833}, doi = {10.1093/isq/sqac013}, pages = {13}, year = {2022}, abstract = {International organizations (IOs) try to incorporate policy-specific best practices and country-specific knowledge to increase well-informed decision-making. However, the relative contribution of the two kinds of knowledge to organizational performance is insufficiently understood. The article addresses this gap by focusing on the role of staff in World Bank performance. It posits that country-specific knowledge, sectoral knowledge, and their combination positively contribute to World Bank projects. The argument is tested drawing on a novel database on the tenure, nationality, and educational background of World Bank Task Team Leaders. Three findings stand out. First, country-specific knowledge seems to matter on average, while sectoral knowledge does not. Second, there is some evidence that staff that combine both kinds of knowledge are empowered to make more positive contributions to performance. Third, the diversity and relevance of experience, not length of tenure, are associated with more success. The findings contribute to discussions on international bureaucracies by highlighting how differences between the knowledge of individual staff shape their decision-making and performance. IOs could better tap into the existing resources in their bureaucracies to enhance their performance by rotating staff less frequently between duty stations.}, language = {en} } @article{Stoppel2021, author = {Stoppel, Relika}, title = {Alcohol availability and alcohol-attributable mortality}, series = {CESifo economic studies : CESifo, a joint initiative of the University of Munich's Center for Economic Studies and the Ifo Institute}, volume = {67}, journal = {CESifo economic studies : CESifo, a joint initiative of the University of Munich's Center for Economic Studies and the Ifo Institute}, number = {4}, publisher = {Oxford Univ. Press}, address = {Oxford}, issn = {1610-241X}, doi = {10.1093/cesifo/ifab008}, pages = {463 -- 487}, year = {2021}, abstract = {It is commonly known that irresponsible alcohol use can have adverse effects. For some people, it results in health problems, for others in productivity loss, and some experience the worst possible outcome of alcohol misuse - death. This paper estimates the effect of reduced alcohol sales hours on alcohol-attributable mortality (AAM) in Estonia. Using novel mortality data from 1997 to 2015, this paper analyzes the effect of alcohol sales policies at both the county level and the country level. By applying the difference-in-differences method and the ARIMA model, this paper finds that the alcohol sales policy reduced AAM to between 1.710 and 2.401 deaths per 100,000 per month, which equals a reduction of 31\% to 40\% in AAM deaths. These findings suggest that individuals who are the most at risk of dying from alcohol-attributable causes of death benefit remarkably from reduced alcohol availability.}, language = {en} } @book{OPUS4-9171, title = {The European Union and Russia}, series = {Potsdamer Textb{\"u}cher ; 28}, journal = {Potsdamer Textb{\"u}cher ; 28}, editor = {Franzke, Jochen and Koszel, Bogdan and Kinyakin, Andrej}, publisher = {Welttrends}, address = {Potsdam}, isbn = {978-3-945878-21-7}, publisher = {Universit{\"a}t Potsdam}, pages = {278}, year = {2016}, abstract = {Since spring 2014 the relations between the EU and Russia are stuck in an Ice Age. From a Western point of view, especially the annexation of Crimea by Russia and the intervention in the conflict in Ukraine are responsible. The EU has frozen their relations to Russia and applied sanctions against it. Russia reacted in the same way. Can this vicious circle be broken without betraying the values of the EU? This book presents the analysis and ideas of social scientists from Germany, Poland and Russia. The reasons for this crisis are seen quite differently but all try to find a way out of the current confrontation.}, language = {en} } @article{WagnerBickenbachSchultzetal.2015, author = {Wagner, Dieter and Bickenbach, Wulf and Schultz, Christian and Lux, Nadine and Gerhardt, Fabian}, title = {Interne Kooperation der Universit{\"a}t Potsdam im Bereich Entrepreneurship Education}, series = {Entrepreneurship education: das Potsdamer Modell der Gr{\"u}ndungslehre und -beratung}, journal = {Entrepreneurship education: das Potsdamer Modell der Gr{\"u}ndungslehre und -beratung}, publisher = {BoD}, address = {Norderstedt}, isbn = {978-3-7357-6095-1}, pages = {64 -- 75}, year = {2015}, language = {de} } @article{Schultz2015, author = {Schultz, Christian}, title = {Der Businessplan}, series = {Entrepreneurship education: das Potsdamer Modell der Gr{\"u}ndungslehre und -beratung}, journal = {Entrepreneurship education: das Potsdamer Modell der Gr{\"u}ndungslehre und -beratung}, publisher = {BoD}, address = {Norderstedt}, isbn = {978-3-7357-6095-1}, pages = {126 -- 130}, year = {2015}, language = {de} } @techreport{SultanowKochCox2020, author = {Sultanow, Eldar and Koch, Christian and Cox, Sean}, title = {Collatz Sequences in the Light of Graph Theory}, edition = {3rd version}, doi = {10.25932/publishup-44185}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-441859}, pages = {29}, year = {2020}, abstract = {It is well known that the inverted Collatz sequence can be represented as a graph or a tree. Similarly, it is acknowledged that in order to prove the Collatz conjecture, one must demonstrate that this tree covers all (odd) natural numbers. A structured reachability analysis is hitherto not available. This paper investigates the problem from a graph theory perspective. We define a tree that consists of nodes labeled with Collatz sequence numbers. This tree will be transformed into a sub-tree that only contains odd labeled nodes. The analysis of this tree will provide new insights into the structure of Collatz sequences. The findings are of special interest to possible cycles within a sequence. Next, we describe the conditions which must be fulfilled by a cycle. Finally, we demonstrate how these conditions could be used to prove that the only possible cycle within a Collatz sequence is the trivial cycle, starting with the number 1, as conjectured by Lothar Collatz.}, language = {en} } @techreport{SultanowKochCox2020, author = {Sultanow, Eldar and Koch, Christian and Cox, Sean}, title = {Collatz Sequences in the Light of Graph Theory}, edition = {4th version}, doi = {10.25932/publishup-44325}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-443254}, pages = {31}, year = {2020}, abstract = {It is well known that the inverted Collatz sequence can be represented as a graph or a tree. Similarly, it is acknowledged that in order to prove the Collatz conjecture, one must demonstrate that this tree covers all odd natural numbers. A structured reachability analysis is hitherto not available. This paper investigates the problem from a graph theory perspective. We define a tree that consists of nodes labeled with Collatz sequence numbers. This tree will be transformed into a sub-tree that only contains odd labeled nodes. The analysis of this tree will provide new insights into the structure of Collatz sequences. The findings are of special interest to possible cycles within a sequence. Next, we describe the conditions which must be fulfilled by a cycle. Finally, we demonstrate how these conditions could be used to prove that the only possible cycle within a Collatz sequence is the trivial cycle, starting with the number one, as conjectured by Lothar Collatz.}, language = {en} }