1,720,982 research outputs found
A propos des paysages urbains savoyards : l'importance et le rôle des petites villes dans l'histoire et la civilisation du XVe siècle
No full textLeguay J.-P. A propos des paysages urbains savoyards : l'importance et le rôle des petites villes dans l'histoire et la civilisation du XVe siècle. In: Le Globe. Revue genevoise de géographie, tome 125, 1985. Les Alpes dans le temps et dans l'espace. pp. 171-183
Prieur (J.), Bocquet(A.), Colardelle (M.), Leguay(J.-P.), Loup(J.), Fontanel(J.). — 1983. — La Savoie des origines à l'An mil.
No full textJanin Bernard. Prieur (J.), Bocquet(A.), Colardelle (M.), Leguay(J.-P.), Loup(J.), Fontanel(J.). — 1983. — La Savoie des origines à l'An mil.. In: Revue de géographie alpine, tome 72, n°1, 1984. p. 118
End-to-end delay prediction based on traffic matrix sampling
Full text linkIn this paper we focus on the problem of predicting Quality of Service (QoS), and in particular end-to-end delay, by using traffic matrix samples. To this aim, we study different models based on machine learning as a promising tool to characterize performance in complex computer networks. More specifically, we first provide a simulation platform, based on NS 3 network simulator, in which each Origin-Destination (OD) flow is a mixture of UDP and TCP traffic and we generate useful data for our study. We present three datasets over which we gradually vary the network characteristics: incoming traffic intensity, link capacities, and propagation delays. The datasets are leveraged to train machine learning models, namely Neural Networks and Random Forests, to predict end-to-end delay starting from the knowledge of OD traffic matrix samples. The robustness of these models is evaluated in different test scenarios. Numerical results show that both models are able to accurately forecast the end-to-end delay over all tested datasets, with Random Forests outperforming Neural Networks with gaps as high as 40%
Clustered robust routing for traffic engineering in software-defined networks
No full textOne of the key advantages of Software-Defined Networks (SDN) is the opportunity to integrate Traffic Engineering modules able to optimize network configuration according to traffic. Ideally, the network should be dynamically reconfigured as traffic evolves, so as to achieve remarkable gains in the efficient use of resources with respect to traditional static approaches. Unfortunately, reconfigurations cannot be too frequent due to a number of reasons related to route stability, forwarding rules instantiation, individual flows dynamics, traffic monitoring overhead, etc. In this paper, we focus on the fundamental problem of deciding whether, when and how to reconfigure the network during traffic evolution. We propose a new approach to cluster relevant points in the multi-dimensional traffic space taking into account similarities in multiple domains and not only in traffic values. Moreover, to provide more flexibility to the decisions on when to apply a reconfiguration, we allow some overlap between clusters that can guarantee a good-quality routing even in case of smooth transitions. We compare our algorithm with state-of-the-art approaches in realistic network scenarios. Results show that our method significantly reduces the number of reconfigurations with a negligible deviation of the network performance with respect to the continuous update of the network configuration. Moreover, we present an experimental platform where our solution is implemented in a production-ready SDN controller
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Method and device for configuring a network of removed wireless sensors
Full text linkAbstract (en)
The method involves defining performance criteria, and defining characteristics of a geographical area and characteristics of unattended ground sensors in the area. A number of nodes is allocated to the area, and an area optimization process is applied in the area. The number of nodes is increased or the performance criteria defined in the area, where the performance criteria that are not satisfied are modified. The area optimization process is reproduced in the area with new number of nodes or new performance criteria, and a determined configuration at each node in the area is applied. Independent claims are also included for the following: (1) a device for configuring a network of removed wireless sensors (2) a computer program comprising a set of instructions for implementing a method for configuring a network of removed wireless sensors.
Abstract (fr)
Le procédé de configuration d'un réseau de capteurs sans fils déposés comporte les étapes suivantes : 1 Définir (étape 12) des critères de performance constituant des contraintes (CPC), avec des valeurs seuil associées (CPC*), et au moins un critère de performance à optimiser (CPO), pour au moins une zone (Z i ) à équiper de noeuds, chaque critère de performance étant défini par un modèle 2 Définir (étape 10) pour la ou chaque zone (Z i ) a. Des caractéristiques (d) de la zone b. Des caractéristiques (E j ) des capteurs dans la zone 3 Allouer (étape 10) à la ou chaque zone (Z i ) à équiper, un nombre de noeuds 4 Appliquer (étape 22) un processus d'optimisation par zone sur la ou chaque zone (Z i ), 5 Augmenter (16) le nombre de noeuds ou modifier (14) les critères de performance (CPC* et CPO) définis dans la ou chaque zone où les critères de performance ne sont pas satisfaits et reproduire dans ces zones le processus d'optimisation par zone avec le nouveau nombre de noeuds ou les nouveaux critères de performance (CPC* et CPO), et 6 Appliquer la configuration déterminée à chaque noeud dans la ou chaque zone
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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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