177,431 research outputs found
Le néomartyr Nicolas Casetti
No full textBousquet R. Le néomartyr Nicolas Casetti. In: Échos d'Orient, tome 9, n°61, 1906. pp. 363-366
TCP smart framing: a segmentation algorithm to reduce TCP latency
No full textTCP Smart Framing, or TCP-SF for short, enables the Fast Retransmit/Recovery algorithms even when the congestion window is small. Without modifying the TCP congestion control based on the additive-increase/multiplicative-decrease paradigm, TCP-SF adopts a novel segmentation algorithm: while Classic TCP always tries to send full-sized segments, a TCP-SF source adopts a more flexible segmentation algorithm to try and always have a number of in-flight segments larger than 3 so as to enable Fast Recovery. We motivate this choice by real traffic measurements, which indicate that today's traffic is populated by short-lived flows, whose only means to recover from a packet loss is by triggering a Retransmission Timeout. The key idea of TCP-SF can be implemented on top of any TCP flavor, from Tahoe to SACK, and requires modifications to the server TCP stack only, and can be easily coupled with recent TCP enhancements. The performance of the proposed TCP modification were studied by means of simulations, live measurements and an analytical model. In addition, the analytical model we have devised has a general scope, making it a valid tool for TCP performance evaluation in the small window region. Improvements are remarkable under several buffer management schemes, and maximized by byte-oriented schemes
Critical energy density of O(n) models in d=3
No full textA relation between O(n) models and Ising models has been recently conjectured (Casetti et al 2011 Phys. Rev. Lett. 106 057208). Such a relation, inspired by an energy landscape analysis, implies that the microcanonical density of states of an O(n) spin model on a lattice can be effectively approximated in terms of the density of states of an Ising model defined on the same lattice and with the same interactions. Were this relation exact, it would imply that the critical energy densities of all the O(n) models (i.e. the average values per spin of the O(n) Hamiltonians at their respective critical temperatures) should be equal to that of the corresponding Ising model. It is therefore worth investigating how different the critical energies are and how this difference depends on n. We compare the critical energy densities of O(n) models in three dimensions in some specific cases: the O(1) or Ising model, the O(2) or XY model, the O(3) or Heisenberg model, the O(4) model and the O(∞) or spherical model, all defined on regular cubic lattices and with ferromagnetic nearest-neighbor interactions. The values of the critical energy density in the n=2, n=3 and n=4 cases are derived through a finite-size scaling analysis of data produced by means of Monte Carlo simulations on lattices with up to 1283 sites. For n=2 and n=3 the accuracy of previously known results has been improved. We finally derive an interpolation formula showing that the difference between the critical energy densities of O(n) models and that of the Ising model is smaller than 1% if n< 8 and never exceeds 3% for any n. © 2014 IOP Publishing Ltd and SISSA Medialab srl
Imaginary Screens: The Hypnotic Gesture and Early Film
No full textRuggero Eugeni argues that film profited from an insistent reference to hypnosis. If in early depictions, hypnotists were pointing their fingers at the subject in order to hit him or her with a shot of magnetic fluid, by the early twentieth century, subjects were induced into a hypnotic state as the hypnotist’s hand waved repeatedly in front of the eyes. This new gestural format, repeatedly staged by the movies of the same period, was instrumental in mirroring and shaping in imaginary terms the film’s screening conditions and the viewer’s experience. At a moment when a nascent cinema might have been defined in a number of ways, the anachronistic figure of the hypnotist’s hand worked to establish the screen rather than the film or the projector as the essential elements of an emerging assemblage
Ogni libro, lo sai, è un'autobiografia. Lettera a Francesco Casetti
No full textLettera a Francesco Casett
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
Mi piace condividere con te alcune considerazioni
No full textUna lettera aperta a Francesco Casetti, uno dei più noti semiotici italiani del cinema, in cui si discutono alcune questioni metodologiche, riportandole al tema delle generazioni di studiosi italiani
Dis-pl(a)y
No full textFestschrift in onore di Francesco Casetti: il display e la sua dimensione manuale
Caro Francesco, saggio in onore di Francesco Casetti, in R. Eugeni, M. G. Fanchi ( a cura di), La galassia Casetti, Milano, Edizioni Vita e pensiero, 2017.
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