http://hdl.handle.net/2117/3177 Fri, 24 May 2013 15:57:05 GMT 2013-05-24T15:57:05Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/18788 Title: Power management in sensing subsystem of wireless multimedia sensor networks Authors: Alaei, Mohammad; Barceló Ordinas, José María Abstract: 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 impossible or inconvenient to recharge the battery, because nodes are deployed in a hostile or unpractical environment. On the other hand, the sensor network should have a lifetime long enough to fulfill the application requirements. Accordingly, energy conservation in nodes and maximization of network lifetime are commonly recognized as a key challenge in the design and implementation of WSNs. Experimental measurements have shown that generally data transmission is very expensive in terms of energy consumption, while data processing consumes significantly less (Raghunathan et al., 2002). The energy cost of transmitting a single bit of information is approximately the same as that needed for processing a thousand operations in a typical sensor node (Pottie & Kaiser, 2000). The energy consumption of the sensing subsystem depends on the specific sensor type. In some cases of scalar sensors, it is negligible with respect to the energy consumed by the processing and, above all, the communication subsystems. In other cases, the energy expenditure for data sensing may be comparable to, or even greater (in the case of multimedia sensing) than the energy needed for data transmission. In general, energy-saving techniques focus on two subsystems: the communication subsystem (i.e., energy management is taken into account in the operations of each single node, as well as in the design of networking protocols), and the sensing subsystem (i.e., techniques are used to reduce the amount or frequency of energy-expensive samples). Mon, 15 Apr 2013 10:50:13 GMT http://hdl.handle.net/2117/18788 2013-04-15T10:50:13Z Alaei, Mohammad; Barceló Ordinas, José María no Power management, Wireless multimedia sensor networks 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 impossible or inconvenient to recharge the battery, because nodes are deployed in a hostile or unpractical environment. On the other hand, the sensor network should have a lifetime long enough to fulfill the application requirements. Accordingly, energy conservation in nodes and maximization of network lifetime are commonly recognized as a key challenge in the design and implementation of WSNs. Experimental measurements have shown that generally data transmission is very expensive in terms of energy consumption, while data processing consumes significantly less (Raghunathan et al., 2002). The energy cost of transmitting a single bit of information is approximately the same as that needed for processing a thousand operations in a typical sensor node (Pottie & Kaiser, 2000). The energy consumption of the sensing subsystem depends on the specific sensor type. In some cases of scalar sensors, it is negligible with respect to the energy consumed by the processing and, above all, the communication subsystems. In other cases, the energy expenditure for data sensing may be comparable to, or even greater (in the case of multimedia sensing) than the energy needed for data transmission. In general, energy-saving techniques focus on two subsystems: the communication subsystem (i.e., energy management is taken into account in the operations of each single node, as well as in the design of networking protocols), and the sensing subsystem (i.e., techniques are used to reduce the amount or frequency of energy-expensive samples). http://hdl.handle.net/2117/18201 Title: RSU deployment for content dissemination and downloading in intelligent transportation systems Authors: Reineri, Massimo; Casetti, Claudio; Chiasserini, Carla-Fabiana; Fiore, Marco; Trullols Cruces, Óscar; Barceló Ordinas, José María Tue, 12 Mar 2013 10:50:20 GMT http://hdl.handle.net/2117/18201 2013-03-12T10:50:20Z Reineri, Massimo; Casetti, Claudio; Chiasserini, Carla-Fabiana; Fiore, Marco; Trullols Cruces, Óscar; Barceló Ordinas, José María no http://hdl.handle.net/2117/18011 Title: Las comunicaciones móviles en los edificios inteligentes Authors: Reyes Muñoz, María Angélica Abstract: 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. Wed, 27 Feb 2013 16:31:39 GMT http://hdl.handle.net/2117/18011 2013-02-27T16:31:39Z Reyes Muñoz, María Angélica no Edificios Inteligentes, Redes locales, Comunicaciones móviles, Gestión de red 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. http://hdl.handle.net/2117/10687 Title: Spain Authors: Navarro Moldes, Leandro Abstract: 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. Mon, 20 Dec 2010 16:17:28 GMT http://hdl.handle.net/2117/10687 2010-12-20T16:17:28Z Navarro Moldes, Leandro no 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. http://hdl.handle.net/2117/10686 Title: Spain Authors: Guasch, Assumpció; Navarro Moldes, Leandro Abstract: 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. Mon, 20 Dec 2010 15:53:42 GMT http://hdl.handle.net/2117/10686 2010-12-20T15:53:42Z Guasch, Assumpció; Navarro Moldes, Leandro no 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. http://hdl.handle.net/2117/10682 Title: Spain Authors: Navarro Moldes, Leandro Abstract: 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. Mon, 20 Dec 2010 12:38:27 GMT http://hdl.handle.net/2117/10682 2010-12-20T12:38:27Z Navarro Moldes, Leandro no 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. http://hdl.handle.net/2117/10307 Title: Toward QoS provision for virtualized resources in grids Authors: Rodríguez Haro, Fernando; Freitag, Fèlix; Navarro Moldes, Leandro Abstract: 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 solution adjusts the resources needed by each VM according to an agreed QoS. We achieve this by a local resource manager (LRM), which we implemented as a prototype and deployed on Xen-virtualized machines. By means of experiments we show that the implemented management component can meet the service-level objectives (SLOs) by dynamically adjusting virtualized resources according to demand. Tue, 16 Nov 2010 12:13:43 GMT http://hdl.handle.net/2117/10307 2010-11-16T12:13:43Z Rodríguez Haro, Fernando; Freitag, Fèlix; Navarro Moldes, Leandro no QoS, Dynamic resource management, Virtualization, Service-level objective (SLO) 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 solution adjusts the resources needed by each VM according to an agreed QoS. We achieve this by a local resource manager (LRM), which we implemented as a prototype and deployed on Xen-virtualized machines. By means of experiments we show that the implemented management component can meet the service-level objectives (SLOs) by dynamically adjusting virtualized resources according to demand. http://hdl.handle.net/2117/7072 Title: La xarxa Internet com a xarxa social Authors: Medina Llinàs, Manuel Fri, 23 Apr 2010 17:01:40 GMT http://hdl.handle.net/2117/7072 2010-04-23T17:01:40Z Medina Llinàs, Manuel no http://hdl.handle.net/2117/6644 Title: Evaluation of a cooperative ARQ protocol for delay-tolerant vehicular networks Authors: Morillo Pozo, Julián David; Trullols Cruces, Óscar; Barceló Ordinas, José María; García Vidal, Jorge Abstract: 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 vehicle densities scenarios. Mon, 15 Mar 2010 10:51:22 GMT http://hdl.handle.net/2117/6644 2010-03-15T10:51:22Z Morillo Pozo, Julián David; Trullols Cruces, Óscar; Barceló Ordinas, José María; García Vidal, Jorge no Cooperative systems, Disruptive tolerant networks 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 vehicle densities scenarios. http://hdl.handle.net/2117/6570 Title: Grid4All: open market places for democratic grids Authors: Krishnaswamy, Ruby; Navarro Moldes, Leandro; Brunner, René; León Gutiérrez, Xavier; Vilajosana Guillen, Xavier Abstract: 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 and services either for a shared-interest within a virtual organization (pooling) or for an open market across virtual organizations. These two models of distributing resources that co-exist locally, contribute to achieve global regulation. We propose an architecture according to these ideas, which are inspired by real-world cases, which include a collection of data sharing and execution services, used by collaborative applications. Mon, 08 Mar 2010 15:02:04 GMT http://hdl.handle.net/2117/6570 2010-03-08T15:02:04Z Krishnaswamy, Ruby; Navarro Moldes, Leandro; Brunner, René; León Gutiérrez, Xavier; Vilajosana Guillen, Xavier no Economic-aware Grid application, Markets and market mechanisms for the Grid, Democratic Grid, Large-scale Grid market, Virtual organizations 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 and services either for a shared-interest within a virtual organization (pooling) or for an open market across virtual organizations. These two models of distributing resources that co-exist locally, contribute to achieve global regulation. We propose an architecture according to these ideas, which are inspired by real-world cases, which include a collection of data sharing and execution services, used by collaborative applications. http://hdl.handle.net/2117/6494 Title: 8. Working Group: Identififi cation of People and Assets Authors: Medina Llinàs, Manuel Fri, 26 Feb 2010 17:34:12 GMT http://hdl.handle.net/2117/6494 2010-02-26T17:34:12Z Medina Llinàs, Manuel no