1,720,979 research outputs found
Analytic results in aligned axion inflation
Get PDFThe original model of axion natural inflation produces a tensor-to-scalar ratio above the experimental limit. Aligned axion inflation admits inflationary trajectories that originate near a saddle point of the two-field potential, and terminate due to the instability of the orthogonal direction. The phenomenology of these solutions is within the current constraints, and a range of parameters will be probed by the next stage CMB experiments. We provide the analytic solution for these trajectories and very compact analytic expressions for the associated phenomenology. For parameters leading to the observed value for the scalar spectral tilt the extension of the inflationary trajectory is sub-Planckian. However, one eigenvalue of the axion kinetic matrix (in the basis that diagonalizes the potential) is trans-Planckian. Finally, we discuss the post-inflationary evolution after the instability. In some cases, the fields reach a second inflationary valley, connected to a minimum. Multiple stages of inflation might be a more general occurrence in multiple-field inflationary models with trajectories starting next to critical points
The Traveling salesman problem in circulant weighted graphs with two stripes
No full textThe Symmetric Circulant Traveling Salesman Problem asks for the minimum cost of a Hamiltonian cycle in a circulant weighted undirected graph. The computational complexity of this problem is not known.
Just a constructive upper bound, and a good lower bound have been determined.
This paper provides a characterization of the two stripe case. Instances where the minimum cost of a Hamiltonian cycle is equal either to the upper bound, or to the lower bound are recognized. A new construction providing Hamiltonian cycles, whose cost is in many cases lower than the upper bound, is
proposed for the remaining instances
The Travelling Salesman Problem in Symmetric Circulant Matrices with Two Stripes
No full textThe Symmetric Circulant Travelling Salesman Problem asks for the minimum cost tour in a symmetric circulant matrix. The computational complexity of this problem is not known – only upper and lower bounds have been determined. This paper provides a characterisation of the two-stripe case. Instances where the minimum cost of a tour is equal to either the upper or lower bound are recognised. A new construction providing a tour is proposed for the remaining instances, and this leads to a new upper bound that is closer than the previous one
Reingeniería organizacional del restaurante El Coirón
Get PDFA partir de la hipótesis: la realización de una reingeniería de la organización mediante la aplicación de un plan de negocios y la ampliación del establecimiento, mejorará la gestión del restaurante y atención al público”, se realizó un asesoramiento profesional a los dueños del restaurante El Coirón, ubicado en la ruta 82 del departamento de Lujan de Cuyo, provincia de Mendoza, República Argentina. El mismo consistió en un plan de negocios con el fin de permitirles consolidar una gestión formal y más eficiente de su organización.
El presente trabajo es un estudio modificativo y se planteó como objetivo general un incremento en la utilidades del 20% para el próximo año y como específicos: invertir en la ampliación de las instalaciones y capacidad del restaurante en un 60% en los próximos cuatro meses; acortar los tiempos de entrega de comida en un 40% e invertir en publicidad y promoción un 15% de las ganancias semestrales.
La evaluación del proyecto de ampliación, dio como resultado la viabilidad del mismo. Lo expuesto se vio reflejado en indicadores como el VAN (Valor Actual Neto) $ 211.258, el cual indica que si los dueños llevaran a cabo el proyecto su riqueza se incrementaría en dicho monto. Una TIR (tasa interna de retorno) de 75% refleja una estimación de la rentabilidad del proyecto. Otro indicador positivo que confirma la viabilidad, es la Relación de Beneficio Costo de 1,46 por ser mayor a 1.Fil: Greco, Federico Jos
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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