1,721,062 research outputs found
Tailoring Complex Network Theory for Water Distribution Networks Analysis
Full text linkTutto ciò che ci circonda è connesso: individui nella società, infrastrutture nelle città, cellule nel cervello, specie interagenti negli ecosistemi, ecc. Queste connessioni ci consentono di rappresentare tutti i sistemi reali complessi come reti e ci aiutano a capire come il mondo reale funziona davvero.
Nuovi approcci e metriche, che spesso superano i tradizionali strumenti di analisi, sono resi disponibili per modellare e interpretare un numero impressionante di fenomeni naturali e antropici, ovvero per esplorare e comprendere le caratteristiche delle reti. Stiamo parlando della Teoria delle Reti Complesse (CNT), una nuova sfida che affascina e coinvolge la comunità scientifica.
In questa tesi, ci proponiamo di contribuire allo studio delle reti di distribuzione idrica (WDNs), in particolare al rapporto tra struttura connettiva e dinamiche che si verificano in queste reti complesse, adattando i classici strumenti della CNT. Lo studio parte dai concetti base proposti dalla CNT, ne mostra i limiti che presentano quando applicati a sistemi infrastrutturali come le WDNs, fortemente vincolati spazialmente, e ne propone un adattamento.
Quindi, proponiamo un nuovo framework per modellare e analizzare le WDNs tenendo conto delle loro peculiarità intrinseche e dei loro limiti spaziali migliorando la loro analisi e fornendo strumenti più affidabili per identificare il comportamento effettivo di questi sistemi idraulici.
A tal proposito, proponiamo nuove metriche e modelli, coadiuvati da strumenti di calcolo efficienti.Everything around us is connected: individuals in society, infrastructures in cities, cells in the brains, interacting species in ecosystems, etc... These connections allow us to represent all complex real systems as networks and help us to understand how the world really works.
Novel approaches and metrics, that often go beyond traditional analysis tools, are made available to model and interpret an impressive number of natural and anthropogenic phenomena, i.e., to investigate and understand the networks behavior. We are talking about the Complex Networks Theory (CNT), a new challenge that fascinates and involves the scientific community.
In this thesis, we aim to contribute to the study of Water Distribution Networks (WDNs), particularly to the relationship between connective structure and dynamics occurring in these complex networks, tailoring classic CNT tools. The study starts from the basic concepts proposed by the CNT, shows the limits they present when applied to infrastructural systems such as WDNs, strongly constrained spatially, and proposes their tailoring.
Then, we suggest a new complex network-based framework to model and simulate WDNs accounting for their intrinsic peculiarities and spatial limits enhancing the WDNs analysis and providing more reliable tools to identify the actual behaviour of these hydraulic systems.
Accordingly, we propose new metrics and models, supported by efficient calculation tools.Tout autour de nous est connecté : les individus dans la société, les infrastructures dans les villes, les cellules du cerveau, les espèces en interaction dans les écosystèmes, etc. Ces connexions nous permettent de représenter tous les systèmes réels complexes comme des réseaux nous aidant à comprendre comment le monde réel fonctionne vraiment.
Nouvelles approches et métriques, qui vont souvent au-delà des outils d'analyse traditionnels, sont mises à disposition pour modéliser et interpréter un nombre impressionnant de phénomènes naturels et anthropiques, c'est-à-dire explorer et comprendre les caractéristiques des réseaux. Nous parlons de la Théorie des Réseaux Complexes (CNT), un nouveau défi qui fascine et engage la communauté scientifique.
Dans cette thèse, nous entendons contribuer à l'étude des réseaux de distribution d'eau (WDN), en particulier à la relation entre la structure connective et la dynamique se produisant dans ces réseaux complexes, en adaptant les classiques outils de la CNT. L'étude part des concepts de base proposés par la CNT et montre les limites qu'ils présentent lorsqu'ils sont appliqués à des systèmes infrastructurelles tels que les WDN, fortement contraints spatialement, et propose leur adaptation.
Ainsi, nous proposons un nouveau cadre pour modéliser et simuler les WDN en tenant compte de leurs particularités intrinsèques et de leurs limites spatiales en améliorant leur analyse et en fournissant des outils plus fiables pour identifier le comportement réel de ces systèmes hydrauliques.
À cet égard, nous proposons des nouvelles métriques et modèles, soutenus par des outils de calcul efficaces
Effect of Different Flight Conditions at the Release of a Small Spacecraft from a High Performance Aircraft
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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
MEAN FLOW INSIDE AQUATIC VEGETATION ON GENTLE COMPLEX BEDS: EXPERIMENTS AND ANALYTICAL MODELS.
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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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