7,820 research outputs found
Towards Loop-Free Forwarding of Anonymous Internet Datagrams that Enforce Provenance
The way in which addressing and forwarding are implemented in the Internet
constitutes one of its biggest privacy and security challenges. The fact that
source addresses in Internet datagrams cannot be trusted makes the IP Internet
inherently vulnerable to DoS and DDoS attacks. The Internet forwarding plane is
open to attacks to the privacy of datagram sources, because source addresses in
Internet datagrams have global scope. The fact an Internet datagrams are
forwarded based solely on the destination addresses stated in datagram headers
and the next hops stored in the forwarding information bases (FIB) of relaying
routers allows Internet datagrams to traverse loops, which wastes resources and
leaves the Internet open to further attacks. We introduce PEAR (Provenance
Enforcement through Addressing and Routing), a new approach for addressing and
forwarding of Internet datagrams that enables anonymous forwarding of Internet
datagrams, eliminates many of the existing DDoS attacks on the IP Internet, and
prevents Internet datagrams from looping, even in the presence of routing-table
loops.Comment: Proceedings of IEEE Globecom 2016, 4-8 December 2016, Washington,
D.C., US
Coaliciones legislativas en un contexto de Partido dominante: El caso de la LVIII Legislatura en el Congreso del Estado de México
En el presente trabajo se revela la existencia de una coalición ganadora amplia en la lviii Legislatura del Congreso del Estado de México que encabeza el Partido Revolucionario Institucional ( pri ) e integran otros cuatro partidos: Partido Acción Nacional ( pan ), Partido de la Revolución Democrática ( prd ), Partido Verde Ecologista de México ( pvem ) y Nueva Alianza ( na ). El objetivo de esta coalición no es construir una mayoría sino dar legitimidad a las iniciativas votadas en el Congreso. También se describe la posición de cada uno de los partidos representados en el Congreso del Estado de México en cuanto a su votación a favor, votación en contra, abstenciones y ausencia en las votaciones. Esta coalición tiene la particularidad de que, a diferencia de la competitividad existente a nivel nacional, que se refleja en la alternancia, en el Estado de México el sistema de partido dominante ha retomado un nuevo punto de equilibrio
Making Name-Based Content Routing More Efficient than Link-State Routing
The Diffusive Name-based Routing Protocol (DNRP) is introduced for efficient
name-based routing in information-centric networks (ICN). DNRP establishes and
maintains multiple loop-free routes to the nearest instances of a name prefix
using only distance information. DNRP eliminates the need for periodic updates,
maintaining topology information, storing complete paths to content replicas,
or knowing about all the sites storing replicas of named content. DNRP is
suitable for large ICNs with large numbers of prefixes stored at multiple
sites. It is shown that DNRP provides loop-free routes to content independently
of the state of the topology and that it converges within a finite time to
correct routes to name prefixes after arbitrary changes in the network topology
or the placement of prefix instances. The result of simulation experiments
illustrates that DNRP is more efficient than link-state routing approaches
Análisis del contenido argumentativo en un corpus de ensayos en inglés
El objetivo general del proyecto “Análisis del contenido argumentativo en un corpus de ensayos en inglés” como el título lo sugiere, analizar el contenido de los argumentos en el discurso mediante la comparación y contraste de ensayos escritos por los alumnos, para obtener un modelo de referencia en el contexto la argumentación. Para empezar a discutir un modelo argumentativo, es importante saber primero qué es un argumento. Van Dijk (1978) lo define como un diálogo persuasivo, cuyo objetivo es convencer al receptor de la credibilidad de la aseveración propuesta. Para ser consistente, todo argumento debe incluir enunciados aceptables, razonamientos válidos y un esquema argumentativo apropiado y correcto. Díaz (2009) identifica seis elementos, de los cuales tres son obligatorios y tres opcionales. Los obligatorios son: punto de vista o conclusión (P), fundamentación (F), y garante (G). Los opcionales, aunque no menos importantes, son: condicionamiento de la conclusión (Cd), concesión (K) y refutación (R).Como veremos, estos elementos provienen del análisis de las corrientes de la argumentación
A Light-Weight Forwarding Plane for Content-Centric Networks
We present CCN-DART, a more efficient forwarding approach for content-centric
networking (CCN) than named data networking (NDN) that substitutes Pending
Interest Tables (PIT) with Data Answer Routing Tables (DART) and uses a novel
approach to eliminate forwarding loops. The forwarding state required at each
router using CCN-DART consists of segments of the routes between consumers and
content providers that traverse a content router, rather than the Interests
that the router forwards towards content providers. Accordingly, the size of a
DART is proportional to the number of routes used by Interests traversing a
router, rather than the number of Interests traversing a router. We show that
CCN-DART avoids forwarding loops by comparing distances to name prefixes
reported by neighbors, even when routing loops exist. Results of simulation
experiments comparing CCN-DART with NDN using the ndnSIM simulation tool show
that CCN-DART incurs 10 to 20 times less storage overhead
Enabling Correct Interest Forwarding and Retransmissions in a Content Centric Network
We show that the mechanisms used in the name data networking (NDN) and the
original content centric networking (CCN) architectures may not detect Interest
loops, even if the network in which they operate is static and no faults occur.
Furthermore, we show that no correct Interest forwarding strategy can be
defined that allows Interest aggregation and attempts to detect Interest
looping by identifying Interests uniquely. We introduce SIFAH (Strategy for
Interest Forwarding and Aggregation with Hop-Counts), the first Interest
forwarding strategy shown to be correct under any operational conditions of a
content centric network. SIFAH operates by having forwarding information bases
(FIBs) store the next hops and number of hops to named content, and by having
each Interest state the name of the requested content and the hop count from
the router forwarding an Interest to the content. We present the results of
simulation experiments using the ndnSIM simulator comparing CCN and NDN with
SIFAH. The results of these experiments illustrate the negative impact of
undetected Interest looping when Interests are aggregated in CCN and NDN, and
the performance advantages of using SIFAH
The use of Planetary Nebulae precursors in the study of Diffuse Interstellar Bands
We present the first results of a systematic search for Diffuse Interstellar
Bands in a carefully selected sample of post-AGB stars observed with high
resolution optical spectroscopy. These stars are shown to be ideal targets to
study this old, intriguing astrophysical problem. Our results suggest that the
carrier(s) of these bands may not be present in the circumstellar environments
of these evolved stars. The implications of the results obtained on the
identification of the still unknown carrier(s) are discussed.Comment: 4 pages, 2 figures, proceedings of the conference 'Planetary Nebulae
as Astrophysical Tools', held in Gdansk, Poland (June 28 - July 2, 2005
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Approaching Fair Collision-Free Channel Access with Slotted ALOHA Using Collaborative Policy-Based Reinforcement Learning
Role of resonances in rho^0 -> pi^+ pi^- gamma
We study the effect of the sigma(600) and a_1(1260) resonances in the rho^0
-> pi^+ pi^- gamma decay, within the meson dominance model. Major effects are
driven by the mass and width parameters of the sigma(600), and the usually
neglected contribution of the a_1(1260), although small by itself, may become
sizable through its interference with pion bremsstrahlung, and the proper
relative sign can favor the central value of the experimental branching ratio.
We present a procedure, using the gauge invariant structure of the resonant
amplitudes, to kinematically enhance the resonant effects in the angular and
energy distribution of the photon. We also elaborate on the coupling constants
involved.Comment: 5 pages, 5 figures, accepted for publication in PR
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