1,721,300 research outputs found
C. A. Molinaro, Direito Ambiental Proibição de retrocesso, 2007
No full textKrolik Christophe. C. A. Molinaro, Direito Ambiental Proibição de retrocesso, 2007. In: Revue Juridique de l'Environnement, n°4, 2012. RIO+20. pp. 741-742
C. A. Molinaro, Direito Ambiental Proibição de retrocesso, 2007
No full textKrolik Christophe. C. A. Molinaro, Direito Ambiental Proibição de retrocesso, 2007. In: Revue Juridique de l'Environnement, n°4, 2012. RIO+20. pp. 741-742
Design of Information-centric publish-subscribe mechanisms for Internet of Things
Full text linkLe emergenti applicazioni nell’ambito dell’Internet of Things (IoT) richiedono un’efficiente diffusione dei contenuti sia in scenari statici che mobili. La cosiddetta architettura Information-Centric Networking (ICN) con il modello di comunicazione publish-subscribe, può soddisfare con successo i requisiti richiesti dai sistemi IoT. Diverse soluzioni per l’implementazione del paradigma publish-subscribe basate su ICN sono state proposte in letteratura, ma nessuna studia esplicitamente scenari mobili. Per colmare questa lacuna, la presente tesi apporta i seguenti contributi: (i) nuovi schemi di comunicazione publish-subscribe in grado di supportare la mobilità degli utenti nelle reti ICN; (ii) modelli analitici che descrivono l'overhead di comunicazione generato dai suddetti schemi, (iii) valutazione dell'accuratezza dei modelli proposti attraverso simulazioni. Lo studio è stato condotto su servizi IoT in topologie di rete ben note che riproducono scenari urbani e rurali. I risultati ottenuti convalidano i modelli analitici concepiti e mettono in evidenza i pro e i contro degli approcci proposti, enfatizzando quando uno schema dovrebbe essere preferito all'altro.Emerging Internet of Things (IoT) applications, such as Intelligent Transport System (ITS), require efficient content dissemination mechanisms based on the publish-subscribe model in static and mobile scenarios. The Information- Centric Networking (ICN) architecture can successfully satisfy these requirements. In its native formulation, ICN can fulfill publish-subscribe data dissemination and natively support mobile applications. At the time of this writing, several ICN-based solutions have been proposed to implement the publish-subscribe model, but none of them is explicitly tailored to mobile scenarios. To bridge this gap, this thesis presents the following contributions: (i) new pull-based and push-based publish-subscribe communication schema, able to support user mobility in ICN networks; (ii) analytical models describing the communication overhead they incur, (iii) evaluation of the accuracy of the proposed models through computer simulations. The con- ducted study considers well-known benchmark network topologies, real IoT monitoring services, and standardized settings for urban and rural environments. From one side, our obtained results validate the conceived analytical models. From another side, they highlight pros and cons of pull-based and push-based approaches by emphasizing the conditions under which one scheme should be preferred to the other one
Performance of a Dynamic Channel Allocation Technique Based on Signal Strength Measures
No full textWe analyze a dynamic channel assignment mechanism which selects the full-duplex channel that provides the minimum sum of signal strength measures on both uplink and downlink channels. In a previous work such a mechanism has been shown able to provide a remarkably better reuse degree than the “optimal” fixed channel assignment algorithm. In this paper we improve the analysis considering the impact of call admission control policies on system efficiency and flexibility. We show that a call admission algorithm based on the same signal strength measures used for the selection slightly impairs the reuse efficiency, but allow the system to exploit traffic fluctuation
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
The Impact of Signal Strength Measures on the Efficiency of Dynamic Channel Allocation Technique
No full textDifferent dynamic channel allocation (DCA) strategies based on local signal strength measures are evaluated in terms of the degree of frequency reuse they can afford. Fixed and dynamic channel allocation schemes are compared by using a simulation model, which overcomes the limitations of models traditionally used in literature. Valuable results show the superiority of DCA schemes in various scenarios characterized by different patterns of traffic and propagation condition
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
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