UPCommons - E-prints UPC Universitat Politècnica de Catalunya
E-prints UPC cobreix dues finalitats: per una banda, és el dipòsit institucional de la UPC que recull els articles de revista, les comunicacions de congrés i els reports de recerca generats en les activitats de recerca del personal docent i investigador de la universitat; per l'altra, és una eina que permet accelerar la producció científica, allotjant versions de documents prèvies a la publicació en una revista o a les actes d’un congrés.
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Mostrando recursos 1 - 12 de 12
Opportunistic routing in wireless mesh networks - Darehshoorzadeh, Amir; Cerdà Alabern, Llorenç; Pla Boscà, Vicent
Opportunistic Routing (OR) has been proposed as a way to increase the performance of wireless networks by exploiting its broadcast nature. In OR, instead of pre-selecting a single specific node to be the next-hop as a forwarder for a packet, multiple nodes can potentially be selected as the next-hop forwarder. Thus the source can use multiple potential paths to deliver the packets to the destination. More specially, when the current node transmits a packet, all the candidates that receive the packet successfully will coordinate with each other to determine which one would actually forward the packet according to some criteria,...
Power management in sensing subsystem of wireless multimedia sensor networks - Alaei, Mohammad; Barceló Ordinas, José María
A wireless sensor network consists of sensor
nodes deployed over a geographical area for
monitoring physical phenomena like temperature, humidity, vibrations, seismic events, and so on. Typically, a sensor node is a tiny device that includes three basic components: a sensing subsystem for data acquisition from the physical surrounding environment, a processing subsystem for local data processing and storage, and a wireless communication subsystem for data transmission. In addition, a power source supplies the energy needed by the device to perform the programmed task. This power source often consists of a battery with a limited energy budget. In addition, it is usually...
Las comunicaciones móviles en los edificios inteligentes - Reyes Muñoz, María Angélica
Este trabajo presenta una plataforma de red móvil aplicada a los entornos de
edificios inteligentes. En primer lugar, los edificios inteligentes han sido definidos
como “aquellos que utilizan la tecnología computacional para gestionar de manera
autónoma todos los servicios que ofrece un entorno de un edificio tales como
optimizar el confort del usuario, el consumo de energía y la seguridad” [Callaghan
00].Desde el punto de vista de las telecomunicaciones específicamente desde el
punto de vista de las comunicaciones móviles es muy importante para los edificios
inteligentes considerar la comunicación entre sistemas autónomos inteligentes,
dispositivos personales inteligentes, gestión de sistemas de información,
dispositivos móviles, etc.
Toward QoS provision for virtualized resources in grids - Rodríguez Haro, Fernando; Freitag, Fèlix; Navarro Moldes, Leandro
Virtualization solutions have recently gained considerable attention for supporting the consolidation of application servers into one physical machine. In a vanilla Xen implementation the scheduler shares equally all of the available physical CPU resources among the contending VMs. However, when the application that runs in the virtual machine space changes dynamically its resource requirements, a different solution is needed. Furthermore, if the resource usage is associated with service-level agreements, a predefined equal share of the processor power is not sufficient for the VMs. In this chapter, we present an approach to manage the QoS of virtualized resources in Grids. Our...
Grid4All: open market places for democratic grids - Krishnaswamy, Ruby; Navarro Moldes, Leandro; Brunner, René; León Gutiérrez, Xavier; Vilajosana Guillen, Xavier
The Grid4All project is focused on the provision of the benefits and opportunities of Grids for everyone, including small organizations such as schools, families, non-governmental organizations, or small businesses. This involves multiple relevant and related aspects despite the scale of the global system: (i) self-management of applications as they adapt to environmental changes, (ii) the complexity of developing and using applications in that situation by multiple users, (iii) and the need to organize, govern, and regulate the community. Grid4All1 promotes the concept of a democratic Grid, virtual organizations and self-management systems, based on decentralized overlays. Thereby, the providers offer resources...
Spain - Navarro Moldes, Leandro
Spain is a highly developed country, ranked sixteenth on the Human Development Index in 2008,1 with more than 46 million inhabitants. The level of access to information and communications technologies (ICTs) is high. For instance, 63.6 % of households have at least one computer, and 51% of the population are internet users.2 The educational sector is particularly well connected: all universities have Wi-Fi internet access on their campuses, and 99.3 % of schools have ICT equipment and internet access.
Spain - Guasch, Assumpció; Navarro Moldes, Leandro
How can we make citizens’ rights effective in the information society? Without a doubt, the answer is: with a wider and more direct participation by citizens. However, the development of the information society is
dominated by a commercial and technical perspective that tends to be emphasised to the detriment of other perspectives that are much more important but more difficult to measure. These include: the definition of
the rules of the game and the “social contract” (e.g. legal framework), as well as indicators of indirect impact such as production of and access to knowledge, changes in social relations and participation.
Spain - Navarro Moldes, Leandro
Information and communications technologies (ICTs) constitute a market where diverse industries, producers and consumers converge, but also a public space where citizens and organisations live and interact. Although the ICT market is huge and involves a large part of the population,
the ICT public space as a social structure where citizens and organisations exercise the right to communicate is fragile and underdeveloped. In this context, this report focuses on appropriateness of technology and locally relevant content, applications and services.
Evaluation of a cooperative ARQ protocol for delay-tolerant vehicular networks - Morillo Pozo, Julián David; Trullols Cruces, Óscar; Barceló Ordinas, José María; García Vidal, Jorge
This paper evaluates a Cooperative ARQ protocol to be used in delay-tolerant vehicular networks. The scenario consists in cars downloading information from Access Points along a road. The key difference between proposed Cooperative ARQ protocols is when the cooperation takes place. Simply C-ARQ cooperation occurs in a packet-by-packet basis. In this proposal, that we call DC-ARQ (Delayed Cooperative ARQ), the cooperation is delayed until cars are out of the coverage area of the Access Point. The scheme has been evaluated through simulations. A comparison of DC-ARQ with a
baseline case in which no cooperation is used has been performed under different...