TY - JOUR A1 - Speck, Karsten A1 - Schubarth, Wilfried A1 - Seidel, Andreas T1 - Theorie-Praxis-Verhältnis in der zweiten der Lehrerbildung Empirische Befunde und theoretische Implikationen Y1 - 2007 SN - 978-3-939469-60-5 ER - TY - JOUR A1 - Schubarth, Wilfried A1 - Speck, Karsten A1 - Große, Ulrike A1 - Seidel, Andreas A1 - Gemsa, Charlotte T1 - Die zweite Phase der Lehrerausbildung aus Sicht der Brandenburger Lehramtskandidatinnen und Lehramtskandidaten : die Potsdamer LKA-Studie 2004/05 Y1 - 2006 SN - 3- 937786-08-2 ER - TY - JOUR A1 - Schubarth, Wilfried A1 - Speck, Karsten A1 - Seidel, Andreas T1 - Die 2. Phase der Lehrerbildung : Ergebnisse der Potsdamer Lehramtskandidaten- und Seminarleiter-Studie zum Theorie-Praxis-Verhältnis Y1 - 2006 SN - 3-939469-49-1 ER - TY - JOUR A1 - Schubarth, Wilfried A1 - Schulze-Reichelt, Friederike A1 - Mauermeister, Sylvi A1 - Seidel, Andreas A1 - Apostolow, Benjamin T1 - Studieneingang optimieren! BT - Empfehlungen zur Weiterentwicklung der Studieneingangsphase an Hochschulen JF - Alles auf Anfang! Befunde und Perspektiven zum Studieneingang Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-428605 SN - 978-3-86956-452-4 SN - 2192-1075 SN - 2192-1083 SP - 355 EP - 369 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Schubarth, Wilfried A1 - Schulze-Reichelt, Friederike A1 - Mauermeister, Sylvi A1 - Seidel, Andreas A1 - Hartmann, Nina T1 - Einführung in den Band JF - Alles auf Anfang! Befunde und Perspektiven zum Studieneingang Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-428342 SN - 978-3-86956-452-4 SN - 2192-1075 SN - 2192-1083 SP - 13 EP - 22 PB - Universtitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Schubarth, Wilfried A1 - Mauermeister, Sylvi A1 - Seidel, Andreas T1 - Einführung: Debatten und Positionen zur Hochschulentwicklung JF - Potsdamer Beiträge zur Hochschulforschung Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-399372 SN - 978-3-86956-399-2 SN - 2192-1075 SN - 2192-1083 IS - 3 SP - 9 EP - 15 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Göbel, Andreas A1 - Lagodzinski, Gregor J. A. A1 - Seidel, Karen T1 - Counting homomorphisms to trees modulo a prime JF - ACM transactions on computation theory : TOCT / Association for Computing Machinery N2 - Many important graph-theoretic notions can be encoded as counting graph homomorphism problems, such as partition functions in statistical physics, in particular independent sets and colourings. In this article, we study the complexity of #(p) HOMSTOH, the problem of counting graph homomorphisms from an input graph to a graph H modulo a prime number p. Dyer and Greenhill proved a dichotomy stating that the tractability of non-modular counting graph homomorphisms depends on the structure of the target graph. Many intractable cases in non-modular counting become tractable in modular counting due to the common phenomenon of cancellation. In subsequent studies on counting modulo 2, however, the influence of the structure of H on the tractability was shown to persist, which yields similar dichotomies.
Our main result states that for every tree H and every prime p the problem #pHOMSTOH is either polynomial time computable or #P-p-complete. This relates to the conjecture of Faben and Jerrum stating that this dichotomy holds for every graph H when counting modulo 2. In contrast to previous results on modular counting, the tractable cases of #pHOMSTOH are essentially the same for all values of the modulo when H is a tree. To prove this result, we study the structural properties of a homomorphism. As an important interim result, our study yields a dichotomy for the problem of counting weighted independent sets in a bipartite graph modulo some prime p. These results are the first suggesting that such dichotomies hold not only for the modulo 2 case but also for the modular counting functions of all primes p. KW - Graph homomorphisms KW - modular counting KW - complexity dichotomy Y1 - 2021 U6 - https://doi.org/10.1145/3460958 SN - 1942-3454 SN - 1942-3462 VL - 13 IS - 3 SP - 1 EP - 33 PB - Association for Computing Machinery CY - New York ER - TY - JOUR A1 - Seidel, Andreas A1 - Schubarth, Wilfried A1 - Speck, Karsten T1 - Vereint in unsicheren Zeiten? : Eine Pilotstudie unter Jugendlichen in Ostdeutschland, Polen und Russland Y1 - 2011 SN - 978-3-86956-124-0 ER - TY - JOUR A1 - Pinkernelle, Josephine A1 - Abraham, Andreas A1 - Seidel, Katja A1 - Braun, Katharina T1 - Paternal deprivation induces dendritic and synaptic changes and hemispheric asymmetry of pyramidal neurons in the somatosensory cortex N2 - Similar to maternal care, paternal care is a source of neonatal sensory stimulation, which in primates and rodents has been shown to be essential for developing structure and function of sensory cortices. The aim of our study in the biparental rodent Octodon degus was to assess the impact of paternal deprivation on dendritic and synaptic development in the somatosensory cortex. We (i) quantified the amount of paternal care in relation to total parental investment and (ii) compared dendritic and synaptic development of pyramidal neurons in the somatosensory cortex of animals raised by a single mother or by both parents. On the behavioral level we show that paternal care comprises 37% of total parent-offspring interactions, and that the somatosensory stimulation provided by the fathers primarily consists of huddling, licking/grooming, and playing. On the morphological level we found that, compared with offspring raised by both parents (mother and father), the father-deprived animals displayed significantly reduced spine numbers on the basal dendrites of pyramidal neurons. Furthermore, paternal deprivation induces hemispheric asymmetry of the dendritic morphology of somatosensory pyramidal neurons. Father-deprived animals show shorter and less complex basal dendrites in the left somatosensory cortex compared with the right hemisphere. These findings indicate that paternal deprivation results in delayed or retarded dendritic and synaptic development of somatosensory circuits. Y1 - 2009 UR - http://www3.interscience.wiley.com/cgi-bin/jhome/114030483 U6 - https://doi.org/10.1002/Dneu.20726 SN - 1932-8451 ER - TY - JOUR A1 - Schubarth, Wilfried A1 - Speck, Karsten A1 - Gladasch, Ulrike A1 - Seidel, Andreas T1 - Die 2. Phase der Lehrerausbildung aus Sicht der Brandenburger Lehramtskandidatinnen - die Potsdamer LAK-Studie Y1 - 2007 SN - 978-3-8309-1821-9 ER -