1,720,961 research outputs found
Green networking: Integration of wireless sensor network with home gigabit access
No full textActual home networks have become an heterogeneous environment in terms of technologies used and do not take into account any intelligent energy saving mechanism. In this paper we propose anenergy saving strategy by integrating a Wireless Sensor Network (WSN) with a high speed, hybrid home network. The main objective is to demonstrate that a WSN can act as a dependable control plane, where low data rate control packets can flow even when the high speed home network is shut down. While the home network nodes or some of each node's network technologies can be deactivate, the WSN is always on and, due to the low data rate required to properly work, it consumes a very limited quantity of energy. This mutual interaction between the high speed home network and the WSN allows at the same time to achiveve the convergence of heterogeneouscommunication technologies in the home environment and leads to a substantial reduction of the energy consumptions. Simulation results show that this strategy is effective in a multitude of scenarios and provides a tangible economical benefit. ?????? 2011 IIMC
A MDP approach to fault-tolerant routing
No full textThis paper defines a theoretical framework based on Markov Decision Processes (MDP) to deal with faulttolerant routing algorithms in heterogeneous networks, which are realized through the integration of assorted wired and wireless telecommunication technologies. Such kinds of networks are characterized by fast dynamics of link availabilities, mainly due to the extensive use of wireless technologies. The novelty of this paper is the formulation of the fault-tolerant routing problem as a MDP, which is used to compute the optimal re-routing policy. As in existing fault-tolerant algorithms, when a path becomes unavailable, the traffic flows transmitted over that path are re-routed on another available path; the novelty is that the new selected path is the one that minimizes re-routing occurrences, since it is selected taking into consideration the probability that also the alternative paths can become unavailable in the future. As a by-product, the optimal path selection for newtraffic flows is also obtained. Simulations show the effectiveness of the proposed approach. © 2012 EUCA
Dynamic Class of Service mapping for Quality of Experience control in future networks
No full textThe present work introduces a novel approach to cope with some key limitations of the present communication networks. In particular, the need for effectively managing heterogeneous resources over heterogeneous networks while guaranteeing personalized Quality of Experience (QoE) requirements to the applications, claims for a full cognitive approach which is realized through the introduction of an appropriate Future Internet architecture. The paper, taking this architecture in mind, introduces the innovative concept of dynamic association between applications and Classes of Services, performed by means of proper Reinforcement Learning algorithms. The resulting procedure guarantees QoE personalization, requires low processing capabilities and entails limited signalling overhead
A dynamic load balancing algorithm for Quality of Service and mobility management in next generation home networks
No full textHeterogeneity of connection technologies and nodes mobility open new challenges in home networks control strategies. Moreover, user's needs are changing towards applications requiring high transmission speeds such as 3D gaming, enhanced interactivity and high definition video. Each of those applications puts several constraints on the network capabilities to guarantee requirements on the Quality of Service. In this paper we introduce an innovative concept based on fast load balancing algorithm operating on top of a convergence layer, in order to rapidly react to network changes and contemporaneously to satisfy strict application demands. We formulated the load balancing problem as a Multi-Commodity Flow and resolved it with a column generation approach using Lagrangian Relaxation and Dijkstra algorithm. The load balancing problem computational complexity is decreased with respect to state of the art load balancing solutions based on linear programming techniques. Proof of concept simulation results are reported
Quality of Experience Provision in the Future Internet
Full text linkThis work deals with the satisfaction of the quality of
experience (QoE) requirements in the perspective of the emerging
future Internet framework. The evolution of the Internet is pointing
out its limitations, which are likely to hinder its potential. In
this respect, this paper introduces an innovative approach to cope
with some key limitations of the present communication networks.
In particular, the need of efficiently utilizing the available network
resources and of guaranteeing the user expectations in terms of
QoE requires a full cognitive approach, which is realized by the
introduction of a novel architecture design, the so-called future
Internet core platform. The future Internet core platform aims
at bringing together the applications world with the network
world, hence introducing a further cognitive level while enabling a
new generation of applications: network-aware applications. This
paper is concerned with an important aspect of the intelligent
connectivity between applications and network: the service class
association, which, if performed with a cognitive approach, can
yield some important improvements and advantages in the emerging
information era. The key idea presented in this paper is a
real-time dynamic control procedure for the selection of the optimal
service class. The approach is based on theoretical considerations
validated by a proof-of-concept simulation
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
Situation awareness in airport environment based on Semantic Web technologies
No full textIn the present paper the authors show how the application of Semantic Web technologies, i.e. ontology and rule languages, can be used to describe situations and enhance situation awareness providing also suggested actions to the human operator in a data fusion architecture aimed at airport security. The paper presents the ontology design, i.e. main classes and relationship, and the possible roles for situation categorization including the application of rules. In addition, an insight of alternative options including their pros and cons in terms of representation expressivity and complexity, is provided. An analysis of the architectural issues and their impacts considering available technologies and their limitations have been included in the present paper. In order to validate the proposed approach both from the representation and from the complexity point of view, a comparison with a well-established framework, i.e. Situation Ontology developed by Vistology, has been carried out in terms of language complexity and dynamic behaviour in order to assess the performance and limits of the proposed system. © 2014 IEEE
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
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