296 research outputs found
Providing End-to-End Connectivity to SIP User Agents Behind NATs
Get PDFThe widespread diffusion of private networks in SOHO scenarios is fostering an increased deployment of Network Address Translators (NATs). The presence of NATs seriously limits end-to-end connectivity and prevents protocols like the Session Initiation Protocol (SIP) from working properly. This document shows how the Address List Extension (ALEX), which was originally developed to provide dual-stack and multi-homing support to SIP, can be used, with minor modifications, to ensure end-to-end connectivity for both media and signaling flows, without relying on intermediate relay nodes whenever it is possibl
ALEX: Improving SIP Support in Systems with Multiple Network Addresses
Get PDFThe successful and increasingly adopted session initiation protocol (SIP) does not adequately support hosts with multiple network addresses, such as dual-stack (IPv4-IPv6) or IPv6 multi-homed devices. This paper presents the Address List Extension (ALEX) to SIP that adds effective support to systems with multiple addresses, such as dual-stack hosts or multi-homed IPv6 hosts. ALEX enables IPv6 transport to be used for SIP messages, as well as for communication sessions between SIP user agents (UAs), whenever possible and without compromising compatibility with ALEX-unaware UAs and SIP servers
Increasing Performances of TCP Data Transfers Through Multiple Parallel Connections
No full textAlthough Transmission Control Protocol (TCP) is a widely deployed and successful protocol, it shows some limitations in present-day environments. In particular, it is unable to exploit multiple (physical or logical) paths between two hosts. This paper presents PATTHEL, a session-layer solution designed for parallelizing stream data transfers. Parallelization is achieved by striping the data flow among multiple TCP channels. This solution does not require invasive changes to the networking stack and can be implemented entirely in user space. Moreover, it is flexible enough to suit several scenarios - e.g. it can be used to split a data transfer among multiple relays within a peer-to-peer overlay networ
Dal Convivio alla Monarchia: quale Livio per Dante?
No full textIn questo contributo si prendono in considerazione il riferimento a Livio in Convivio
IV.v, 11 e alcuni dei riferimenti allo storico romano ritenuti maggiormente significativi nel secondo libro della Monarchia. Si dimostra che il rimando a Livio nel primo trattato è introdotto in riferimento a una ripresa probabilmente dal suo abbreviatore Floro e in apertura di un passaggio in cui si utilizza una tradizione storiografica più articolata e complessa, comprendente anche Agostino. Si propone, di conseguenza, che il rimando a Livio non si basi su una conoscenza diretta dello storico latino ma si fondi sulla sintesi realizzata da Floro. Si dimostra poi che, contrariamente all’opinione vulgata, alcuni riferimenti a Livio nella Monarchia, particolarmente quello programmatico di II.iii, 6, non sono riconducibili
in toto alla tradizione indiretta e quindi sembrerebbero suggerire che Dante avesse avuto accesso a questo autore entro la composizione del suo trattato politico.This essay focuses on Dante’s references to Livy in Convivio IV.v, 11 as well as on some particularly important references to the Roman historian in the second book of the De Monarchia. The author argues that the first reference is most likely derived from the epitome compiled by Livy’s abbreviator Florus, and shows how it is placed at the beginning of a passage that refers to several different historiographical sources, including Agustine. The author therefore suggests that this reference to Livy in the Convivio is not based on Dante’s direct knowledge of the work of the Roman historian, but rather on the information contained in the synthesis by Florus. She also challenges the scholarly consensus on this
topic by showing that some references to Livy in the De Monarchia – especially the “programmatic” one in II.iii, 6 – do not appear in the indirect tradition and can only be traced back directly to Livy. This suggests that Dante likely accessed the work of Livy before the composition of his political treatise
Nifedipine effect on exercise test evaluated by computer analysis of CB5 lead (author's transl)
No full text"The Brush-rest and the Tea Stove." Xu Cishu's Biography
Get PDFL'articolo "'The Brush-Rest and the Tea Stove': Xu Cishu's Biography" di Livio Zanini tratta la biografia di Xu Cishu (1547-1604), letterato di Hangzhou autore del Chashu (Trattato sul tè, 1597). La prima parte raccoglie le informazioni introduttive sulle fonti relative a tale autore disponibili, sulla base delle quali è stato possibile tracciare la sua biografia. Figlio di un funzionario e dotato per le lettere, Xu Cishu non intraprese la carriera amministrativa, forse a causa di un suo handicap fisico. Nel corso della sua vita si trovò spesso in difficoltà economiche fu costretto a svolgere diversi lavori che lo portarono a viaggiare lontano dalla sua città natale. Xu Cishu era buon amico di Feng Mengzhen e conosceva Tu Long e altri eminenti letterati dell'area del Jiangnan. Nella parte dedicata alle opere di Xu Cishu viene offerta una descrizione del suo Chashu e si cerca di fare luce sulla sua origine. Il tè il particolare modo in cui veniva consumato era un elemento distintivo dei letterati e divenne oggetto di grande interesse all'interno della letteratura dedicata propri dello stile di vita dell'élite che caratterizza l'ultima parte della dinastia Ming. Il testo di Xu è interamente dedicato a tale bevanda ed è basato prevalentemente sulla sua esperienza personale e su quella di suoi amici e altri esperti di tè. L'ultima parte dell'articolo offre la traduzione integrale del necrologio dedicato a Xu Cishu e delle due prefazioni al suo trattato.Livio Zanini's paper "'The Brush-Rest and the Tea Stove': Xu Cishi's Biography" deals with the biography of Xu Cishu (1547-1604), a scholar from Hangzhou who wrote Chashu (Treatise on Tea, 1597). The first part consist of an introductory survey of all available sources concerning this author, on the basis of which it has been possible to compile his biographical profile. Son of an official and talented in letters, Xu Cishu never pursued a civil service career, perhaps because of a physical handicap. He often ran into financial difficulties and had to carry put irregular jobs requiring him to travel from his hometown. Xu Cishu was a good friend of Feng Mengzhen and was also an acquaintance of Tu Long and many other eminent scholars of the Jiangnan area. The second part of this paper dedicated to Xu Cishu's works offer an outline of his Chashu and an attempt to shed light on its genesis. Tea, and the particular way it was consumed, were distinctive elements of the literati and became a subject of great interest in the literature on "things" proper to the elite lifestyle characterizing the late Ming dynasty. Xu's text, completely dedicated to this beverage, is based mainly on his personal experience and that of his friends and other tea expert. The last part of this paper is the translation of Xu's epitaph and the two prefaces to his treatise
Distribution of arterial pressure and prevalence of hypertension in a population of bank employees in Parma
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