Alex Vallejo

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The smart grid concept provides a solution to the growing recognition that current utility grids need an ICT deployment infrastructure based upgrade to allow millions of potential market players to operate and to cope with distributed generation, wide-area situational awareness, demand response, electric storage, and efficient electric transportation. Smart(More)
To guarantee the correct QoS, the new generation core networks are best managed by the use of a centralized server. Most of these networks use DiffServ due to its scalability, an important feature for large networks. A Bandwidth Broker architecture is a policy-based management system which purpose is to manage DiffServ networks in a centralized manner(More)
The amount of information available on Internet increases by the day. This constant growth makes it difficult to distinguish between information which is relevant and which is not, particularly in key areas which are of strategic interest to business and universities or research centres. This article presents an automatic system to extract social networks:(More)
A wireless Ad Hoc network is formed by a collection of nodes disposed in a dynamic way, without the need for a central node to coordinate them. This is one of the reasons why a great number of routing protocols for Ad Hoc networks are being developed. After the study of a set of them, this paper has subjected four different protocols to different scenario(More)
The centralized management of the QoS in NGNs is currently one of the main lines of research in the networking sector. One of the tasks of the ITU-T organisation in this area is to develop a global architecture capable of managing end-to-end services to be used on future specifications. This paper presents a signalling architecture proposal for the(More)
We have implemented a non-iterative multitaper sensing hardware core. The multitaper core computes the spectrum as the average of M eigenspectra calculated using Slepian sequences. While more computationally complex than traditional Fourier methods, the multitaper estimation method offers enhanced performance. The working multitaper hardware core was(More)
This paper presents a first approach to a new QoS aware routing suitable for wireless and wired Ad-Hoc networks. The proposed algorithm is based on artificial intelligent techniques. Actually, it is a merge between a genetic algorithm and the TBR (Ticket Based Routing) algorithm. A better TBR performance is pursued in order to use the result in ubiquitous(More)
In this paper we present the implementation of a bandwidth broker architecture for the centralized management of the QoS in native IPv6 DiffServ networks in a multi-domain environment. The bandwidth broker has been programmed in JAVA and uses COPS-PR as an infra-domain communication protocol and SIBBSv6 as an inter-domain communication protocol. The latter(More)