1,100 research outputs found

    Information Flow Analysis of Level 4 Payload Processing Operations

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    The Level 4 Mission Sequence Test (MST) was studied to develop strategies and recommendations to facilitate information flow. Recommendations developed as a result of this study include revised format of the Test and Assembly Procedure (TAP) document and a conceptualized software based system to assist in the management of information flow during the MST

    Vertices of simple modules of symmetric groups labelled by hook partitions

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    In this article we study the vertices of simple modules for the symmetric groups in prime characteristic pp. In particular, we complete the classification of the vertices of simple SnS_n-modules labelled by hook partitions

    Quasi-hereditary structure of twisted split category algebras revisited

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    Let kk be a field of characteristic 00, let C\mathsf{C} be a finite split category, let α\alpha be a 2-cocycle of C\mathsf{C} with values in the multiplicative group of kk, and consider the resulting twisted category algebra A:=kαCA:=k_\alpha\mathsf{C}. Several interesting algebras arise that way, for instance, the Brauer algebra. Moreover, the category of biset functors over kk is equivalent to a module category over a condensed algebra εAε\varepsilon A\varepsilon, for an idempotent ε\varepsilon of AA. In [2] the authors proved that AA is quasi-hereditary (with respect to an explicit partial order ≤\le on the set of irreducible modules), and standard modules were given explicitly. Here, we improve the partial order ≤\le by introducing a coarser order ⊴\unlhd leading to the same results on AA, but which allows to pass the quasi-heredity result to the condensed algebra εAε\varepsilon A\varepsilon describing biset functors, thereby giving a different proof of a quasi-heredity result of Webb, see [26]. The new partial order ⊴\unlhd has not been considered before, even in the special cases, and we evaluate it explicitly for the case of biset functors and the Brauer algebra. It also puts further restrictions on the possible composition factors of standard modules.Comment: 39 page

    A ghost algebra of the double Burnside algebra in characteristic zero

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    For a finite group GG, we introduce a multiplication on the \QQ-vector space with basis \scrS_{G\times G}, the set of subgroups of G×GG\times G. The resulting \QQ-algebra \Atilde can be considered as a ghost algebra for the double Burnside ring B(G,G)B(G,G) in the sense that the mark homomorphism from B(G,G)B(G,G) to \Atilde is a ring homomorphism. Our approach interprets \QQ B(G,G) as an algebra eAeeAe, where AA is a twisted monoid algebra and ee is an idempotent in AA. The monoid underlying the algebra AA is again equal to \scrS_{G\times G} with multiplication given by composition of relations (when a subgroup of G×GG\times G is interpreted as a relation between GG and GG). The algebras AA and \Atilde are isomorphic via M\"obius inversion in the poset \scrS_{G\times G}. As an application we improve results by Bouc on the parametrization of simple modules of \QQ B(G,G) and also of simple biset functors, by using results by Linckelmann and Stolorz on the parametrization of simple modules of finite category algebras. Finally, in the case where GG is a cyclic group of order nn, we give an explicit isomorphism between \QQ B(G,G) and a direct product of matrix rings over group algebras of the automorphism groups of cyclic groups of order kk, where kk divides nn.Comment: 41 pages. Changed title from "Ghost algebras of double Burnside algebras via Schur functors" and other minor changes. Final versio

    Signed Young Modules and Simple Specht Modules

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    By a result of Hemmer, every simple Specht module of a finite symmetric group over a field of odd characteristic is a signed Young module. While Specht modules are parametrized by partitions, indecomposable signed Young modules are parametrized by certain pairs of partitions. The main result of this article establishes the signed Young module labels of simple Specht modules. Along the way we prove a number of results concerning indecomposable signed Young modules that are of independent interest. In particular, we determine the label of the indecomposable signed Young module obtained by tensoring a given indecomposable signed Young module with the sign representation. As consequences, we obtain the Green vertices, Green correspondents, cohomological varieties, and complexities of all simple Specht modules and a class of simple modules of symmetric groups, and extend the results of Gill on periodic Young modules to periodic indecomposable signed Young modules.Comment: To appear in Adv. Math. 307 (2017) 369--416. Proposition 4.3 (F4), (F5) corrected, Lemma 4.9 adjusted accordingl

    Information and Beliefs in a Repeated Normal-form Game

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    We study beliefs and choices in a repeated normal-form game. In addition to a baseline treatment with common knowledge of the game structure, feedback about choices in the previous period and random matching, we run treatments (i) with fixed matching, (ii) without information about the opponent’s payoffs, and (iii) without feedback about previous play. Using Stahl and Wilson’s (1995) model of limited strategic reasoning, we classify behavior with regard to its strategic sophistication and consider its development over time. In the treatments with feedback and full information about the game, we observe more strategic play, more best-responses to beliefs and more accurate beliefs over time. While feedback is the main driving force of learning to play strategically and for forming beliefs that accurately predict the behavior of the opponent, both incomplete information about the opponent’s payoffs or lack of feedback lead to a stagnation of best-response rates over time. ZUSAMMENFASSUNG - (Information und Erwartungen in einem wiederholten Normalformspiel) Wir untersuchen die Entwicklung von den Erwartungen über das Verhalten des anderen Spielers und den Entscheidungen in einem wiederholten Normalformspiel. Zusätzlich zum Haupttreatment mit common knowledge über das Spiel, Feedback über das Ergebnis in der vorigen Runde und zufälliger Zuordnung der Spieler, gibt es Kontrolltreatments mit (i) festen paarweisen Zuordnungen der Spieler, (ii) ohne Information über die Auszahlungen des anderen Spielers und (iii) ohne Feedback über das Ergebnis der vorigen Runde. Mit Hilfe von Stahl und Wilsons (1995) Modell begrenzten strategischen Verhaltens klassifizieren wir das Verhalten der Teilnehmer im Hinblick auf die strategische Sophistikation. In den Treatments mit Feedback und vollständiger Information über das Spiel nehmen strategisches Verhalten, beste Antworten auf die eigenen Erwartungen und die Akkuratheit der Erwartungen über die Zeit zu. Während Feedback der Hauptgrund dafür ist, dass die Teilnehmer lernen, sich strategisch zu verhalten und korrekte Erwartungen über das Verhalten des anderen Spielers zu bilden, führen sowohl unvollständige Information über die Auszahlungen des Gegenspielers als auch fehlendes Feedback zu einer Stagnation der Rate der besten Antworten über die Zeit.

    Hybrid inorganic/organic photonic crystal biochips for cancer biomarkers detection

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    We report on hybrid inorganic/organic one-dimensional photonic crystal biochips sustaining Bloch surface waves. The biochips were used, together with an optical platform operating in a label-free and fluorescence configuration simultaneously, to detect the cancer biomarker Angiopoietin 2 in a protein base buffer. The hybrid photonic crystals embed in their geometry a thin functionalization poly-acrylic acid layer deposited by plasma polymerization, which is used to immobilize a monoclonal antibody for highly specific biological recognition. The fluorescence operation mode is described in detail, putting into evidence the role of field enhancement and localization at the photonic crystal surface in the shaping and intensification of the angular fluorescence pattern. In the fluorescence operation mode, the hybrid biochips can attain the limit of detection 6 ng/ml.We report on hybrid inorganic/organic one-dimensional photonic crystal biochips sustaining Bloch surface waves. The biochips were used, together with an optical platform operating in a label-free and fluorescence configuration simultaneously, to detect the cancer biomarker Angiopoietin 2 in a protein base buffer. The hybrid photonic crystals embed in their geometry a thin functionalization poly-acrylic acid layer deposited by plasma polymerization, which is used to immobilize a monoclonal antibody for highly specific biological recognition. The fluorescence operation mode is described in detail, putting into evidence the role of field enhancement and localization at the photonic crystal surface in the shaping and intensification of the angular fluorescence pattern. In the fluorescence operation mode, the hybrid biochips can attain the limit of detection 6 ng/ml

    Der Heilige Geist und die Realisierung des Glaubens in der Geschichte. Ãœberlegungen zur systematischen Funktion der Pneumatologie

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    Die systematische Funktion der Lehre vom Heiligen Geist für die theologische Dogmatik ist umstritten. Der Beitrag arbeitet in einer problemgeschichtlichen Perspektive die These aus, dass der Pneumatologie eine notwendige und eigene Funktion für die Explikation der Religion zukommt. Deren Thema ist, wie zu zeigen sein wird, das Wissen des religiösen Aktes um seine Einbindung in eine inhaltliche Überlieferung sowie deren Wandelbarkeit

    Glaube in der multireligiösen Gesellschaft: Zur Bildungskompetenz evangelischen Glaubensverständnisses

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    An evangelical understanding of religion: The establishment of sensible communication within religious and cultural pluralities The article argues that when different religions and cultures live together in modern societies, it will result in a great deal of conflict. It is also true of Systematic Theology driven by confessions if contact among the religious worlds of modern people is not to be lost or proof of the theoretical religious competence thereof is not to be compromised. This article discusses various theological models to include the reality of the pluralism of societies and attempts to take the existing discussions of the theology of religion further by promoting a certain model that possesses the basic grounds of Reformed Christianity. The thesis of the article reveals that with an evangelical understanding of religion, a certain encounter among religious and cultural differences can be reflected. An obvious religious understanding should not only be in mind, but also the establishment of sensible communication within religious and cultural pluralities
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