94 resultados para Peer-to-Peer networks
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Architectural design and deployment of Peer-to-Peer Video-on-Demand (P2PVoD) systems which support VCR functionalities is attracting the interest of an increasing number of research groups within the scientific community; especially due to the intrinsic characteristics of such systems and the benefits that peers could provide at reducing the server load. This work focuses on the performance analysis of a P2P-VoD system considering user behaviors obtained from real traces together with other synthetic user patterns. The experiments performed show that it is feasible to achieve a performance close to the best possible. Future work will consider monitoring the physical characteristics of the network in order to improve the design of different aspects of a VoD system.
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In this paper we look at how a web-based social software can be used to make qualitative data analysis of online peer-to-peer learning experiences. Specifically, we propose to use Cohere, a web-based social sense-making tool, to observe, track, annotate and visualize discussion group activities in online courses. We define a specific methodology for data observation and structuring, and present results of the analysis of peer interactions conducted in discussion forum in a real case study of a P2PU course. Finally we discuss how network visualization and analysis can be used to gather a better understanding of the peer-to-peer learning experience. To do so, we provide preliminary insights on the social, dialogical and conceptual connections that have been generated within one online discussion group.
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CompP2P s una interfcie grfica implementada amb Java Swing 1.5 del Sistema de Cmput Distribut P2P CompP2P. s una interfcie grfica polivalent, s a dir, pot sser usada en diferents sistemes operatius (Linux, Mac0sX, Windows) i per tant ha d'sser una aplicaci multiplataforma. S'ha aconseguit millorar la gesti de tots els recursos de CompP2P mitjanant una interfcie grfica molt usable i tamb amb modificacions efectuades en el sistema base CompP2P on s'han afegit i/o millorat aspectes com la comunciaci remota, les comandes de gesti del sistema, etc.
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Implementaci del disseny d'una aplicaci de cmput distribut peer-to-peer. Es porta a terme la creaci d'un model del sistema. La implementaci dels algorismes o poltiques que el formen i la simulaci del mateix.
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Peer-reviewed
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Peer-reviewed
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Peer-reviewed
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We discuss how technologies of peer punishment might bias the results that are observed in experiments. A crucial parameter is the fine-to-fee ratio, which describes by how much the punished subjects income is reduced relatively to the fee the punishing subject has to pay to inflict punishment. We show that a punishment technology commonly used in experiments embeds a variable fine-to-fee ratio and show that it confounds the empirical findings about why, whom, and how much subjects punish.
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En el nostre projecte, considerem un escenari urb o interurb on persones amb dispositius mbils (smartphones) o vehicles equipats amb interfcies de comunicaci, estan interessats en compartir fitxers entre ells o descarregar-los al creuar Punts dAccs (APs) propers a la carretera. Estudiem la possibilitat dutilizar la cooperaci en les trobades casuals entre nodes per augmentar la velocitat de descrrega global. Amb aquest objectiu, plantejem algoritmes per a la selecci de quins paquets, per a quins destins i quins transportistes sescullen en cada moment. Mitjanant extenses simulacions, mostrem com les cooperacions carry&forward dels nodes augmenten significativament la velocitat de descrrega dels usuaris, i com aquest resultat es mant per a diversos patrons de mobilitat, collocacions d'AP i crregues de la xarxa. Per altra banda, aparells com els smartphones, on la targeta de WiFi est encesa contnuament, consumeixen l'energia de la bateria en poques hores. En molts escenaris, una targeta WiFi sempre activa s poc til, perque sovint no hi ha necessitat de transmissi o recepci. Aquest fet es veu agreujat en les Delay Tolerant Networks (DTN), on els nodes intercanvien dades quan es creuen i en tenen loportunitat. Les tcniques de gesti de lestalvi denergia permeten extendre la duraci de les bateries. El nostre projecte analitza els avantatges i inconvenients que apareixen quan els nodes apaguen perodicament la seva targeta wireless per a estalviar energia en escenaris DTN. Els nostres resultats mostren les condicions en que un node pot desconnectar la bateria sense afectar la probabilitat de contacte amb altres nodes, i les condicions en que aquesta disminueix. Per exemple, es demostra que la vida del node pot ser duplicada mantenint la probabilitat de contacte a 1. I que aquesta disminueix rpidament en intentar augmentar ms la vida til.
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Peer-reviewed
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The Editorial presents the focus, scope, policies, and the inaugural issue of NeoBiota, a new open access peer-reviewed journal of biological invasions. The new journal NeoBiota is a continuation of the former NEOBIOTA publication series. The journal will deal with all aspects of invasion biology and impose no restrictions on manuscript size neither on use of color. NeoBiota implies an XML-based editorial workflow and several cutting-edge innovations in publishing and dissemination, such as semantic markup of and enhancements to published texts, data publication, and extensive cross-linking within the journal and to external sources
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Peer-reviewed
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Multihop ad-hoc networks have a dynamic topology. Retrieving a route towards a remote peer requires the execution of a recipient lookup, which can publicly reveal sensitive information about him. Within this context, we propose an efficient, practical and scalable solution to guaranteethe anonymity of recipients' nodes in ad-hoc networks.
