1,721,708 research outputs found
Will IPTV ride the peer-to-peer stream? [Peer-to-Peer Multimedia Streaming]
No full textThe great success of P2P systems for the purpose of file-sharing set the path to the next killer application on the Internet, P2P video streaming. Although it solves scalability issues, P2P technology experiences problems of a long start time and churn-induced instability that can greatly affect the user experience. Moreover, technical and business solutions for digital rights management are still under investigation. Great efforts are underway in both academia and industry to solve these problems, whose solution will offer a scalable, affordable, and legal TV quality-like broadcast of content. In this article, we analyze what is available to the end user in terms of P2P video-streaming products and determine which of these are the most promising for IPTV and content distribution companies. In the following, we offer: • A survey of the available architectures. • A set of experiments on a popular peer-topeer system, SopCast. • Guidelines for large scale deployment
Automated Configuration of Vehicular Communication Services2012 International Conference on Connected Vehicles and Expo (ICCVE)
No full textThis paper presents the experimental of a signaling infrastructure which can be successfully used to automatically configure vehicular network services
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
Direction’ forwarding for highly mobile, large scale ad hoc networks
No full textPopular ad hoc routing protocols such as DSDV and AODV use
“predecessor” based forwarding, namely, the packet is forwarded to
the “predecessor” that advertised the shortest path to destination
during the last update. However, if the “predecessor” moves, the
routing table entry becomes invalid and “predecessor” based
forwarding fails! To overcome the stale forward table problem, in this
paper we propose a novel packet forwarding scheme called “direction”
forwarding (DFR). When an update is received, a node records the
“geographical direction” to where the update came from. When
“predecessor” forwarding fails, the packet is forwarded to the “most
promising” neighbor in the recorded direction. If the network is
sufficiently dense and the routing algorithm includes periodic refresh
from destination, direction forwarding will recover from most
“predecessor” failures due to motion. We evaluate DFR in a
LANMAR routing scenario where the direction to each Landmark is
periodically refreshed. Through simulation we show that DFR
considerably enhances LANMAR performance in large, mobile
network scenario
Direction Forward Routing for Highly Mobile Ad-Hoc Networks
No full textPopular ad hoc routing protocols such as DSDV and AODV use “predecessor” based forwarding, namely, the packet is forwarded to the “predecessor” that advertised the shortest path to destination during the last update. However, if the “predecessor” moves, the routing table entry becomes invalid and “predecessor” based forwarding fails! To overcome the stale forward table problem, in this paper we propose a novel packet forwarding scheme called “direction” forwarding (DFR). When an update is received, a node records the “geographical direction” to where the update came from. When “predecessor” forwarding fails, the packet is forwarded to the “most promising” neighbor in the recorded direction. If the network is sufficiently dense and the routing algorithm includes periodic refresh from destination, direction forwarding will recover from most “predecessor” failures due to motion. We evaluate DFR in a LANMAR routing scenario where the direction to each Landmark is periodically refreshed. Through simulation we show that DFR considerably enhances LANMAR performance in large, mobile network scenarios
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
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