3,571 research outputs found
Mining Unclassified Traffic Using Automatic Clustering Techniques
No full textIn this paper we present a fully unsupervised algorithm to identify classes of traffic inside an aggregate. The algorithm leverages on the K-means clustering algorithm, augmented with a mechanism to automatically determine the number of traffic clusters. The signatures used for clustering are statistical representations of the application layer protocols. The proposed technique is extensively tested considering UDP traffic traces collected from operative networks. Performance tests show that it can clusterize the traffic in few tens of pure clusters, achieving an accuracy above 95%. Results are promising and suggest that the proposed approach might effectively be used for automatic traffic monitoring, e.g., to identify the birth of new applications and protocols, or the presence of anomalous or unexpected traffi
KISS: Stochastic Packet Inspection Classifier for UDP Traffic
No full textThis paper proposes KISS, a novel Internet classifica- tion engine. Motivated by the expected raise of UDP traffic, which stems from the momentum of Peer-to-Peer (P2P) streaming appli- cations, we propose a novel classification framework that leverages on statistical characterization of payload. Statistical signatures are derived by the means of a Chi-Square-like test, which extracts the protocol "format," but ignores the protocol "semantic" and "synchronization" rules. The signatures feed a decision process based either on the geometric distance among samples, or on Sup- port Vector Machines. KISS is very accurate, and its signatures are intrinsically robust to packet sampling, reordering, and flow asym- metry, so that it can be used on almost any network. KISS is tested in different scenarios, considering traditional client-server proto- cols, VoIP, and both traditional and new P2P Internet applications. Results are astonishing. The average True Positive percentage is 99.6%, with the worst case equal to 98.1,% while results are al- most perfect when dealing with new P2P streaming applications
Characterization of ISP Traffic: Trends, User Habits, and Access Technology Impact
No full textIn the recent years, the research community has increased its focus on network monitoring which is seen as a key tool to understand the Internet and the Internet users. Several studies have presented a deep characterization of a particular application, or a particular network, considering the point of view of either the ISP, or the Internet user. In this paper, we take a different perspective. We focus on three European countries where we have been collecting traffic for more than a year and a half through 5 vantage points with different access technologies. This humongous amount of information allows us not only to provide precise, multiple, and quantitative measurements of "What the user do with the Internet" in each country but also to identify common/uncommon patterns and habits across different countries and nations. Considering different time scales, we start presenting the trend of application popularity; then we focus our attention to a one-month long period, and further drill into a typical daily characterization of users activity. Results depict an evolving scenario due to the consolidation of new services as Video Streaming and File Hosting and to the adoption of new P2P technologies. Despite the heterogeneity of the users, some common tendencies emerge that can be leveraged by the ISPs to improve their servic
A imagem de Alessandro Baricco no Brasil
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Estudos da Tradução, Florianópolis, 2013.Com a intenção de delinear o modo pelo qual o escritor italiano Alessandro Baricco se inseriu no sistema literário brasileiro e os caminhos percorridos pelos seus livros traduzidos, esta dissertação dá voz às experiências tradutórias de seus tradutores. A inserção de Bariccono Brasil tem seu início em 1997, através de uma proposição da Profa. Dra. Roberta Barni à editora Iluminuras da tradução de Oceano Mare. A partir daí, outras sete obras foram publicadas no Brasil, sendo três delas traduzidas por Roberta Barni e as outras quatro por quatro tradutores diferentes. De um lado, considera-se o tradutor como figura principal namediação entre culturas, e, de outro, se analisa a realidade desta figuradentro do sistema literário, sua invisibilidade, seus limites e o exercíciode sua profissão. A pesquisa conta, ainda, com críticas e resenhas referentes ao autor italiano publicadas em jornais consagrados no Brasil, considerando estas como parte constituinte da imagem de Baricco refletida em território nacional. Abstract : Intending to delineate the way the Italian writer Alessandro Baricco has been inserted in the Brazilian literary system and the paths his translated books have followed, this thesis gives voice to the translating experiences of his translators. Baricco's insertion in Brazil began in 1997, through a personal project of Dr. Roberta Barni, with her translation of Oceano Mare. Since then, seven other of his works have been published in Brazil, three of which were translated by Roberta Barni and the other four by four different translators. On the one hand,the translator is considered as the main figure in mediation betweencultures and, on the other, this figure's reality is analyzed within theliterary system: its invisibility, its limits and its professional practice. Criticisms and reviews of this Italian author published in well established Brazilian newspapers are also considered, with the understanding that they are part of Baricco's image reflected here
La maturità di Alessandro Fei del Barbiere, in bilico tra Maniera e Riforma
No full textThis article studies the mature career of the Florentine painter Alessandro Fei del Barbiere (1537-1592), beginning with the rediscovery of the 'Ascension' altarpiece formerly in the Albizi Chapel in the destroyed church of San Pier Maggiore, Florence. Studying this painting and others recorded in 1584 by the biographer Raffaello Borghini, such as the two altarpieces for Santa Maria delle Grazie and the Madonna dell'Umiltà in Pistoia, the author reconstructs a body of works showing how in the 1580s Fei gradually went beyond the archaic style of his apprenticeship - he had been trained by Ridolfo del Ghirlandaio and Pierfrancesco Foschi, but was also marked by the Maniera of Vasari - evolving towards naturalism in both mimesis and pictorial handling. In Florence, his development partly parallels that of Santi di Tito and his circle, but Fei was also influenced by a probable sojourn during the early part of that decade in Rome, where he could have been inspired by Girolamo Muziano and the painters working for Pope Gregory XIII. Among other proposals, the author suggests that the artist was responsible for decorating the chancel of Fiesole Cathedral (c. 1584-1589), which consisted of an altarpiece, only rarely discussed by scholars, and a cycle of frescoes hitherto attributed to Nicodemo Ferrucci
Giovanni Meo Zilio dal Partito d’Azione alla Lega Nord: curve e spigoli di un intellettuale militante
No full textGiovanni Meo Zilio (1923-2006) was a distinguished scholar of Ibero-Ameri- can languages and literatures and was among the founders of the Interuniversity Center for Venetian Studies (CISVe). This article traces his profile as a public intellectual, span- ning from his participation in the Resistance and his engagement in post-war political life with the Partito d’Azione, to his role in the Italian emigration to Uruguay in the 1950s and his subsequent activities in Italy as an intellectual connected with the Italian Social- ist Party in the 1960s and 1970s, up to his involvement with the Lega Nord in the 1980s and 1990s
La storia di Alessandro
No full textMi chiamo Ale, sono nato a Pavia l'8 ottobre 1978 [...]. Nell'aprile del 2003 ho avuto un grave incidente in motocicletta che ha causato un'invalidità a entrambi gli arti superiori [...]. Sono stati necessari diversi interventi e un anno di ricovero in una clinica di riabilitazione per poter recuperare l'uso parziale del braccio sinistro. La passione per lo sport e una grande determinazione mi hanno spinto a riprendermi la mia vita
Tra socialdemocrazie e Perestrojka. Le relazioni internazionali del Pci attraverso le carte di Alessandro Natta
No full textThis essay reconstructs the foreign policy of the Italian Communist Party during the four
years of Alessandro Natta’s secretariat (1984-1988) through largely original archival documentation,
from the Alessandro Natta Fonds of the Historical Archive of the Chamber of
Deputies. Natta’s papers are also cross-referenced with those kept in the PCI Archive at the
Gramsci Foundation. The author analyses the relationship that the PCI establishes with
Gorbachev’s Perestroika, Deng’s China, and European social democracies during the last
years of the Cold War
Economic Valuation of Forest Recreation in an Alpine Valley
No full textRecreation in forests is an essential service provided by the environment that allows generating considerable incomes for the local population. To make appropriate management strategies, recreational values of forests have to be considered in order to prevent further losses of the landscape and other factors of tourists' attraction. Forest recreational values due to the lack of a market can be estimated using environmental evaluation techniques such as Contingent Valuation (CV), Choice Experiment (CE) or Travel Cost Method (TCM). The first part of the paper offers a meta-analysis of the recreational values of mountain forests in Europe in order to compare the values of similar sites for altitude (above and below 1,000 m a.s.l.), tree species composition (mixed and pure conifer/broadleaved forests) and tourists target. In the second part of the paper, a Benefit Transfer (BT) application is presented by applying the results of the meta-analysis (average value transfer). The "policy" site chosen is an Alpine valley located in the north-east of Italy (Valle di Non, Province of Trento). The results of meta-analysis highlight that the recreation value of the mixed forests is higher than that of pure forests (conifer or broadleaved forests), while the applied economic techniques (CV or TCM) has low influence on the recreational value per visit. Finally, the results of the application show that the total recreational value of the Valle di Non forests is around 2,5 million per year and it has a considerable weight in the Total Economic Value (TEV) of the valley's forests
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