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Search Results: 1 - 10 of 124517 matches for " Tóra Petersen "
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Attachment styles and PTSD in adolescents in three Nordic Countries  [PDF]
Tóra Petersen, Ask Elklit
Open Journal of Epidemiology (OJEpi) , 2013, DOI: 10.4236/ojepi.2013.32010
Abstract:

Studies of possible variables influencing development of posttraumatic stress (PTSD) are of great importance in the effort to enhance preventive and interventional methods in the aim to prevail this devastating condition. Despite the vast research in adults, little is still known of adolescents. Although research is scarce, attachment style has been identified to be an influencing factor in adults, and still research in adolescent is almost non-existent. To our knowledge, no prior study has been conducted, looking at the relationship between attachment style, exposure to a broad range of potentially traumatic events, and subsequent PTSD symptoms in a cross cultural perspective. This is the aim of the present study. Procedure: Data was collected from questionnaire surveys of 1283 adolescents (mean age 14.1 years). Measures: PTSD was measured with The Harvard Trauma Questionnaire-Part IV (HTQ); and attachment style was studied using the Revised Adult Attachment Scale (RAAS). Potentially traumatic events were examined using a broad event list of 19 events. Results: Contrary to what was expected, significant cross cultural differences were found in the distribution of securely, preoccupied, and dismissive attached. Around half of the Faroese population was securely attached, contrary to the Danish and Icelandic population, where the majority was dismissive attached. Cross cultural differences were also found in the distribution of attachment style among those adolescents with PTSD. The majority of the Danish adolescent population with PTSD was dismissive attached; the majority of the Faroese adolescent population with PTSD was securely attached, and in the Icelandic adolescents with PTSD were distributed somewhat even between the four attachment styles. Finally, cross cultural differences were identified in which potentially traumatic events had a significant contribution to the variation in PTSD. The results are

The sorting index
T. Kyle Petersen
Mathematics , 2010,
Abstract: We consider a bivariate polynomial that generalizes both the length and reflection length generating functions in a finite Coxeter group. In seeking a combinatorial description of the coefficients, we are led to the study of a new Mahonian statistic, which we call the sorting index. The sorting index of a permutation and its type B and type D analogues have natural combinatorial descriptions which we describe in detail.
On the shard intersection order of a Coxeter group
T. Kyle Petersen
Mathematics , 2011,
Abstract: Introduced by Reading, the shard intersection order of a finite Coxeter group $W$ is a lattice structure on the elements of $W$ that contains the poset of noncrossing partitions $NC(W)$ as a sublattice. Building on work of Bancroft in the case of the symmetric group, we provide combinatorial models for shard intersections of all classical types, and use this understanding to prove the shard intersection order is EL-shellable. Further, inspired by work of Simion and Ullman on the lattice of noncrossing partitions, we show that the shard intersection order on the symmetric group admits a symmetric boolean decomposition, i.e., a partition into disjoint boolean algebras whose middle ranks coincide with the middle rank of the poset. Our decomposition also yields a new symmetric boolean decomposition of the noncrossing partition lattice.
Two-sided Eulerian numbers via balls in boxes
T. Kyle Petersen
Mathematics , 2012,
Abstract: The Eulerian numbers count permutations according to the number of descents. The two-sided Eulerian numbers count permutations according to number of descents and the number of descents in the inverse permutation. Here we derive some results for Eulerian and two-sided Eulerian numbers using an elementary "balls-in-boxes" approach. We also discuss an open conjecture of Ira Gessel about the two-sided Eulerian numbers.
Enriched $P$-partitions and peak algebras
T. Kyle Petersen
Mathematics , 2005,
Abstract: We develop a more general view of Stembridge's enriched $P$-partitions and use this theory to outline the structure of peak algebras for the symmetric group and the hyperoctahedral group. Initially we focus on commutative peak algebras, spanned by sums of permutations with the same number of peaks, where we consider several variations on the definition of "peak." Whereas Stembridge's enriched $P$-partitions are related to quasisymmetric functions (the dual coalgebra of Solomon's type A descent algebra), our generalized enriched $P$-partitions are related to type B quasisymmetric functions (the dual coalgebra of Solomon's type B descent algebra). Using these functions, we move on to explore (non-commutative) peak algebras spanned by sums of permutations with the same set of peaks. While some of these algebras have been studied before, our approach gives explicit structure constants with a combinatorial description.
A note on three types of quasisymmetric functions
T. Kyle Petersen
Mathematics , 2005,
Abstract: In the context of generating functions for $P$-partitions, we revisit three flavors of quasisymmetric functions: Gessel's quasisymmetric functions, Chow's type B quasisymmetric functions, and Poirier's signed quasisymmetric functions. In each case we use the inner coproduct to give a combinatorial description (counting pairs of permutations) to the multiplication in: Solomon's type A descent algebra, Solomon's type B descent algebra, and the Mantaci-Reutenauer algebra, respectively. The presentation is brief and elementary, our main results coming as consequences of $P$-partition theorems already in the literature.
Enriched $P$-partitions and peak algebras (extended abstract)
T. Kyle Petersen
Mathematics , 2005,
Abstract: We generalize Stembridge's enriched $P$-partitions and use this theory to outline the structure of peak algebras for the symmetric group and the hyperoctahedral group. Whereas Stembridge's enriched $P$-partitions are related to quasisymmetric functions (the coalgebra dual to Solomon's type A descent algebra), our generalized enriched $P$-partitions are related to type B quasisymmetric functions (the coalgebra dual to Solomon's type B descent algebra). Using these functions, we explore three different peak algebras: the "interior" and "left" peak algebras of type A, and a new type B peak algebra. Our results specialize to results for commutative peak algebras as well.
Cyclic descents and P-partitions
T. Kyle Petersen
Mathematics , 2004,
Abstract: Louis Solomon showed that the group algebra of the symmetric group $\mathfrak{S}_{n}$ has a subalgebra called the descent algebra, generated by sums of permutations with a given descent set. In fact, he showed that every Coxeter group has something that can be called a descent algebra. There is also a commutative, semisimple subalgebra of Solomon's descent algebra generated by sums of permutations with the same number of descents: an "Eulerian" descent algebra. For any Coxeter group that is also a Weyl group, Paola Cellini proved the existence of a different Eulerian subalgebra based on a modified definition of descent. We derive the existence of Cellini's subalgebra for the case of the symmetric group and of the hyperoctahedral group using a variation on Richard Stanley's theory of $P$-partitions.
The Politics of Mental Illness and Involvement—A Discourse Analysis of Danish Anti-Stigma and Social Inclusion Campaigns  [PDF]
Jeppe Oute, Lotte Huniche, Connie T. Nielsen, Anders Petersen
Advances in Applied Sociology (AASoci) , 2015, DOI: 10.4236/aasoci.2015.511026
Abstract: The present study is a part of a broader multisited field study on involvement of relatives in Danish psychiatry. The article aims to elucidate which political classifications of normality and mental illness that are displayed in two health political campaigns regarding anti-stigmatization and social inclusion and how such classifications co-constitute the subjectivity of individuals suffering from mental illness and their relatives. Drawing on a discourse theoretical perspective laid out by political theorists Laclau and Mouffe, we analyze how the campaigns bring into effect a weak and ineffective subject of deviance and how it is constituted by a subject of normality characterized by opposing traits. The article takes up the discussion of how the campaigns’ articulations of the subjects of normality and deviance are imbedded in a hegemonic discourse of neoliberalism and individualism that asserts involvement as an expanded division of responsibility for the identification, classification and regulation of mentally ill subjects between public and private spheres of the Danish welfare state.
Eindrücke von der 37. Jahrestagung über Physiologie und Pathologie der Fortpflanzung, gleichzeitig 29. Veterin r-Humanmedizinische Gemeinschaftstagung in München
T?pfer-Petersen E
Journal für Reproduktionsmedizin und Endokrinologie , 2004,
Abstract:
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