1,721,018 research outputs found
Enabling Technologies and Hierarchical Control Plane Management of Software-Defined Networks
Full text linkQuesta tesi descrive in dettaglio le attività di ricerca sulle indagini e le sperimentazioni eseguite per lo sviluppo di un'architettura gerarchica distribuita su larga scala basata su Software-Defined Networks e Network Function Virtualization per Software-Defined Networks.
Nella prima fase, questa ricerca è iniziata con l'analisi dello stato dell'arte delle tecnologie abilitanti eseguendo un confronto incrociato qualitativo tra le tecnologie disponibili (inclusi motori di container, orchestratori e molti altri strumenti di supporto) utilizzando una serie di indicatori di prestazione chiave (KPI). ). Quindi, nella seconda fase, per comprendere l'interazione di queste tecnologie nelle infrastrutture di servizio virtualizzate, considerando i principali risultati dell'analisi qualitativa, l'insieme di tecnologie tra cui Docker come motore di container, Docker Swarm e Kubernetes come orchestratori con bilanciamento del carico e le funzionalità di rilevamento dei servizi sono implementate su piattaforme cloud bare-metal e OpenStack. Vengono condotti test sperimentali per identificare il set di tecnologie più adatto nel caso d'uso industriale e ad alto carico di una smart farm utilizzando KPI, ad esempio utilizzo della CPU, footprint della memoria, carico di rete, ritardo di connessione e tempo di completamento della richiesta. Nella terza fase, viene sviluppato un framework innovativo, distributivo e gerarchico basato sul paradigma SDN, che comprende due livelli di controller SDN per configurare e monitorare switch ottici su larga scala e funzionalità di rete. Inoltre, le funzioni di rete virtuale (VNF) vengono distribuite e gestite in modo ottimale da un orchestratore centralizzato. Il passo finale procede verso la formazione di una nuova metodologia per la gestione dinamica e reattiva delle regole di inoltro in una rete basata su SDN (potenzialmente su larga scala), basata sulla conoscenza della topologia di rete, il consumo di energia degli switch ottici, il previsto volume di traffico e la variabilità del carico di traffico effettivo.This thesis details the research activities on the investigations and experimentation performed for the development of a Software-Defined Networks and Network Function Virtualization based large-scale distributed hierarchical architecture for Software-Defined Networks.
In the first step, this research started off with analyzing the state of the art enabling technologies by performing a qualitative cross-comparison among the available technologies (including container engines, orchestrators, and many other supporting tools) using set of Key Performance Indicators (KPIs). Then, in the second step, to understand the interplay of these technologies in virtualized service infrastructures, by considering the main outcomes of the qualitative analysis, the set of technologies including Docker as the container engine, Docker Swarm and Kubernetes as orchestrators with load balancing and service discovery capabilities are deployed on bare-metal and OpenStack cloud platforms. Experimental tests are conducted to identify the most suitable set of technologies in the high-load and industrial use-case of a smart farm using KPIs e.g., CPU utilization, memory footprint, network load, connection delay, and request completion time. In the third step, an innovative, distributive, and hierarchical framework based on the SDN paradigm is developed, which comprises two levels of SDN controllers to configure and monitor large-scale optical switches and networking functionalities. On top of that, Virtual Network Functions (VNFs) are optimally deployed and managed by a centralized orchestrator. The final step proceeds towards the formation of a novel methodology for the dynamic and reactive management of forwarding rules in a (potentially large-scale) SDN-based network, based on the knowledge of network topology, the power consumption of optical switches, the expected volume of traffic, and the variability of the actual traffic load
Networking-computing resource allocation for hard real-time Green Cloud applications
No full textPerforming real-time applications on top of virtualized cloud systems requires that the overall per-job delay due to the in-cloud processing is upper bounded in a hard way. This opens the question about the optimal dynamic joint allocation of both computing and networking resources hosted in the Cloud. This is the focus of this contribution, where we develop in closed-form the optimal fully scalable energy-saving scheduler for the joint allocation of the task sizes, communication rates and processing rates in delay-constrained Clouds composed by multiple frequency-scalable parallel Virtual Machines (VMs). © 2014 IEEE
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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