123,099 research outputs found

    Heavy quarkonia in quark gluon plasma as open quantum systems

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    Dutta N. Heavy quarkonia in quark gluon plasma as open quantum systems. Bielefeld: Universitätsbibliothek; 2013

    author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct

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    Supplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p

    On Subgraphs of Bounded Degeneracy in Hypergraphs

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    International audienceA kk-uniform hypergraph has degeneracy bounded by dd if every induced subgraph has a vertex of degree at most dd. Given a kk-uniform hypergraph H=(V(H),E(H))H = (V (H), E(H)), we show there exists an induced subgraph of size at least vV(H)min{1,ck(d+1dH(v)+1)1/(k1)}\sum{v\in V (H)} \min \left\{1, c_k\left(\frac{ d + 1}{ d_{H (v)} + 1}\right)^{1/(k−1)}\right\}, where ck=2(1+1k1)(11/k)c_k = 2^{−\left(1+ \frac{1}{ k−1}\right)}(1-1/k) and dH(v)d_{H (v)} denotes the degree of vertex vv in the hypergraph HH. This extends and generalizes a result of Alon-Kahn-Seymour (Graphs and Combinatorics, 1987) for graphs, as well as a result of Dutta-Mubayi-Subramanian (SIAM Journal on Discrete Mathematics, 2012) for linear hypergraphs, to general kk-uniform hypergraphs. We also generalize the results of Srinivasan and Shachnai (SIAM Journal on Discrete Mathematics, 2004) from independent sets (0-degenerate subgraphs) to d-degenerate subgraphs. We further give a simple non-probabilistic proof of the Dutta-Mubayi-Subramanian bound for linear k-uniform hypergraphs, which extends the Alon-Kahn-Seymour (Graphs and Combinatorics, 1987) proof technique to hypergraphs. Our proof combines the random permutation technique of Bopanna-Caro-Wei (see e.g. The Probabilistic Method, N. Alon and J. H. Spencer; Dutta-Mubayi-Subramanian) and also Beame-Luby (SODA, 1990) together with a new local density argument which may be of independent interest. Our results also imply some results in discrete geometry, and we further address some natural algorithmic questions

    Dynamics of Network Formation Processes in the Co-Author Model

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    This article studies the dynamics in the formation processes of a mutual consent network in game theory setting: the Co-Author Model. In this article, a limited observation is applied and analytical results are derived. Then, 2 parameters are varied: the number of individuals in the network and the initial probability of the links in the network in its initial state. A simulation result shows a finding that is consistent with an analytical result for a state of equilibrium while it also shows different possible equilibria.Dynamics, Network, Game Theory, Model,Simulation, Equilibrium, Complexity

    On Subgraphs of Bounded Degeneracy in Hypergraphs

    No full text
    International audienceA kk-uniform hypergraph has degeneracy bounded by dd if every induced subgraph has a vertex of degree at most dd. Given a kk-uniform hypergraph H=(V(H),E(H))H = (V (H), E(H)), we show there exists an induced subgraph of size at least vV(H)min{1,ck(d+1dH(v)+1)1/(k1)}\sum{v\in V (H)} \min \left\{1, c_k\left(\frac{ d + 1}{ d_{H (v)} + 1}\right)^{1/(k−1)}\right\}, where ck=2(1+1k1)(11/k)c_k = 2^{−\left(1+ \frac{1}{ k−1}\right)}(1-1/k) and dH(v)d_{H (v)} denotes the degree of vertex vv in the hypergraph HH. This extends and generalizes a result of Alon-Kahn-Seymour (Graphs and Combinatorics, 1987) for graphs, as well as a result of Dutta-Mubayi-Subramanian (SIAM Journal on Discrete Mathematics, 2012) for linear hypergraphs, to general kk-uniform hypergraphs. We also generalize the results of Srinivasan and Shachnai (SIAM Journal on Discrete Mathematics, 2004) from independent sets (0-degenerate subgraphs) to d-degenerate subgraphs. We further give a simple non-probabilistic proof of the Dutta-Mubayi-Subramanian bound for linear k-uniform hypergraphs, which extends the Alon-Kahn-Seymour (Graphs and Combinatorics, 1987) proof technique to hypergraphs. Our proof combines the random permutation technique of Bopanna-Caro-Wei (see e.g. The Probabilistic Method, N. Alon and J. H. Spencer; Dutta-Mubayi-Subramanian) and also Beame-Luby (SODA, 1990) together with a new local density argument which may be of independent interest. Our results also imply some results in discrete geometry, and we further address some natural algorithmic questions

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed

    Taking Control of Your Health: Review of Neoliberal Health Organizing: Communication, Meaning, and Politics by Mohan J. Dutta

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    A review of Neoliberal Health Organizing: Communication, Meaning, and Politics by Mohan J. Dutta (Left Coast Press, 2015

    Variations on the Author

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    “Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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