10,092 research outputs found

    De retibus socialibus et legibus momenti

    Get PDF
    Online Social Networks (OSNs) are a cutting edge topic. Almost everybody --users, marketers, brands, companies, and researchers-- is approaching OSNs to better understand them and take advantage of their benefits. Maybe one of the key concepts underlying OSNs is that of influence which is highly related, although not entirely identical, to those of popularity and centrality. Influence is, according to Merriam-Webster, "the capacity of causing an effect in indirect or intangible ways". Hence, in the context of OSNs, it has been proposed to analyze the clicks received by promoted URLs in order to check for any positive correlation between the number of visits and different "influence" scores. Such an evaluation methodology is used in this paper to compare a number of those techniques with a new method firstly described here. That new method is a simple and rather elegant solution which tackles with influence in OSNs by applying a physical metaphor.Comment: Changes made for third revision: Brief description of the dataset employed added to Introduction. Minor changes to the description of preparation of the bit.ly datasets. Minor changes to the captions of Tables 1 and 3. Brief addition in the Conclusions section (future line of work added). Added references 16 and 18. Some typos and grammar polishe

    Reinserción del colgajo fibroperióstico en la luxación de los tendones peroneos

    Get PDF
    La luxación de los tendones peroneos es una patología rara. Esta lesión pasa frecuentemente desapercibida y en su forma aguda es diagnosticada de esguince lateral de tobillo. Ocurre habitualmente en deportistas jóvenes y especialmente en accidentes de esquí. La presentación más frecuente es el despegamiento y elevación del retináculo junto con el periostio del margen lateral del extremo distal del peroné formando una bolsa que aloja los tendones luxados. Presentamos tres pacientes con luxación traumática de los tendones peroneos tratados quirúrgicamente según la técnica descrita por Meary, que consiste en la reinserción del colgajo fibroperióstico en el margen posterior del peroné por medio de unos puntos tránseseos. Los pacientes han sido evaluados con una evolución media de cinco años, con resultado excelente.Recurrent dislocation of the peroneal tendons over the lateral malleolus is an uncommon injury. Acute dislocation is frequently unrecognized and often misdiagnosed as an ankle sprain. Occurs in young athletes. Is usually the results of a skiing accident. The retinaculum is elevated from the lateral malleolus along with the periosteum with the tendons lying between periosteum and bone. We present three patients with a traumatic peroneal-ten-don dislocation treated surgically by reconstruction of the retinaculum with transosseous reattachement, described by Meary, were clinically evaluated after an average follow-up interval of five years, with excellent results

    A Highly Available Cluster of Web Servers with Increased Storage Capacity

    Get PDF
    Ponencias de las Decimoséptimas Jornadas de Paralelismo de la Universidad de Castilla-La Mancha celebradas el 18,19 y 20 de septiembre de 2006 en AlbaceteWeb servers scalability has been traditionally solved by improving software elements or increasing hardware resources of the server machine. Another approach has been the usage of distributed architectures. In such architectures, usually, file al- location strategy has been either full replication or full distribution. In previous works we have showed that partial replication offers a good balance between storage capacity and reliability. It offers much higher storage capacity while reliability may be kept at an equivalent level of that from fully replicated solutions. In this paper we present the architectural details of Web cluster solutions adapted to partial replication. We also show that partial replication does not imply a penalty in performance over classical fully replicated architectures. For evaluation purposes we have used a simulation model under the OMNeT++ framework and we use mean service time as a performance comparison metric.Publicad

    An extended Agassi model: algebraic structure, phase diagram, and large size limit

    Get PDF
    The Agassi model is a schematic two-level model that involves pairing and monopole-monopole interactions. It is, therefore, an extension of the well known Lipkin-Meshkov-Glick (LMG) model. In this paper we review the algebraic formulation of an extension of the Agassi model as well as its bosonic realization through the Schwinger representation. Moreover, a mean-field approximation for the model is presented and its phase diagram discussed. Finally, a 1/j1/j analysis, with jj proportional to the degeneracy of each level, is worked out to obtain the thermodynamic limit of the ground state energy and some order parameters from the exact Hamiltonian diagonalization for finitej-j.Comment: Accepted in Physica Scripta. Focus on SSNET 201
    corecore