http://hdl.handle.net/2117/333 Wed, 22 May 2013 07:34:10 GMT 2013-05-22T07:34:10Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/18486 Title: Design and analysis of a framework to enhance optical network utilization resources by means of virtualization Authors: Hesselbach Serra, Xavier; Naumenko, Nikolay Abstract: The time for an all-optical network is already here. The huge capacity of the optical resources, in backbones, distribution and access networks cannot be completely used by current services. The remainders can be used under the deployment of new models for service provisio ning. Network virtualizati on is considered as a serious candidate to enable the flexibl e provision of services in the future Internet. This paper introduces a framework to enhance network virtualization allocati on in optical networks. To increase resources utilization efficiency, a new layer above virtualized elements is introduced to map the demands over the resour ces and infrastructures. For that layer, a strategy based on a resource squa tting model is presented, modeled and analyzed. Fri, 22 Mar 2013 12:01:26 GMT http://hdl.handle.net/2117/18486 2013-03-22T12:01:26Z Hesselbach Serra, Xavier; Naumenko, Nikolay no all-optical, allocation, modeling, squatting, virtualization The time for an all-optical network is already here. The huge capacity of the optical resources, in backbones, distribution and access networks cannot be completely used by current services. The remainders can be used under the deployment of new models for service provisio ning. Network virtualizati on is considered as a serious candidate to enable the flexibl e provision of services in the future Internet. This paper introduces a framework to enhance network virtualization allocati on in optical networks. To increase resources utilization efficiency, a new layer above virtualized elements is introduced to map the demands over the resour ces and infrastructures. For that layer, a strategy based on a resource squa tting model is presented, modeled and analyzed. http://hdl.handle.net/2117/18155 Title: Entornos adaptados para personas con discapacidad mental Authors: Guasch Murillo, Daniel; Bonasa Jiménez, Mª del Pilar; López Novella, Judit; Mayor Sánchez, Carolin; Guasch Murillo, Yolanda Abstract: Las universidades tienen ante sí un reto importante en conseguir entornos accesibles para el alumnado con discapacidad mental donde puedan desarrollar con éxito sus estudios universitarios y, de esta forma, mejorar sus perspectivas laborales. Sólo el 5,4% de las personas con discapacidad de 25 o más años tienen estudios universitarios o equivalentes, siendo este porcentaje del 18,7% en el caso de las personas sin discapacidad (Observatorio Estatal de la Discapacidad, 2010). Si se observa el porcentaje de estudiantes con discapacidad mental frente al resto de discapacidades, según el avance de resultados del censo de alumnos universitarios con discapacidad del curso académico 2011-2012 del Observatorio Estatal de la Discapacidad, el 1,24% son estudiantes con discapacidades intelectuales, el 3,83% padecen trastornos mentales, el 0,58% padecen trastornos generalizados del desarrollo, el 5,95% padecen trastornos psicológicos y el 0,76% padecen trastornos del aprendizaje. Mientras que el número de estudiantes con discapacidad física asciende a un 34,38%, el de estudiantes con discapacidades orgánicas a 10,90%, los que poseen discapacidades visuales 8,59% y los que tienen una discapacidad auditiva son un 6,71%. Si se engloban las discapacidades mentales, el porcentaje de estudiantes con este tipo de discapacidad resulta en un 13,36% constituyéndose como el segundo grupo después de las discapacidades físicas. Fri, 08 Mar 2013 19:12:05 GMT http://hdl.handle.net/2117/18155 2013-03-08T19:12:05Z Guasch Murillo, Daniel; Bonasa Jiménez, Mª del Pilar; López Novella, Judit; Mayor Sánchez, Carolin; Guasch Murillo, Yolanda no Las universidades tienen ante sí un reto importante en conseguir entornos accesibles para el alumnado con discapacidad mental donde puedan desarrollar con éxito sus estudios universitarios y, de esta forma, mejorar sus perspectivas laborales. Sólo el 5,4% de las personas con discapacidad de 25 o más años tienen estudios universitarios o equivalentes, siendo este porcentaje del 18,7% en el caso de las personas sin discapacidad (Observatorio Estatal de la Discapacidad, 2010). Si se observa el porcentaje de estudiantes con discapacidad mental frente al resto de discapacidades, según el avance de resultados del censo de alumnos universitarios con discapacidad del curso académico 2011-2012 del Observatorio Estatal de la Discapacidad, el 1,24% son estudiantes con discapacidades intelectuales, el 3,83% padecen trastornos mentales, el 0,58% padecen trastornos generalizados del desarrollo, el 5,95% padecen trastornos psicológicos y el 0,76% padecen trastornos del aprendizaje. Mientras que el número de estudiantes con discapacidad física asciende a un 34,38%, el de estudiantes con discapacidades orgánicas a 10,90%, los que poseen discapacidades visuales 8,59% y los que tienen una discapacidad auditiva son un 6,71%. Si se engloban las discapacidades mentales, el porcentaje de estudiantes con este tipo de discapacidad resulta en un 13,36% constituyéndose como el segundo grupo después de las discapacidades físicas. http://hdl.handle.net/2117/18100 Title: Enabling SCI-FI: service-oriented context-aware and intelligent future Internet Authors: González Cela, Alberto José; Germán Duarte, Martín; Alcober Segura, Jesús Ángel; Martin de Pozuelo, Ramon; Pinyol, Francesc; Ghafoor, Kayhan Zrar Abstract: Internet is becoming a huge heterogeneous and dynamic network that is growing beyond its architectural limits. The scaling up of the number of communicating nodes and services is leading the Internet to an architectural crisis which in turn makes it difficult to provide services efficiently considering the requirements and context conditions of users. The Information-Centric Networking (ICN) approach proposes a network where the main paradigm is not an end-to-end communication between hosts, as in the current Internet. Instead, an increasing demand for efficient distribution of content has motivated the development of architectures that focus on information objects. ICN supports the proliferation of services and contents allowing seamless access to them. This work proposes a context-aware service negotiation protocol which will enable to find and compose services whilst meeting requesters’ requirements and, consequently, maximizing the QoE of users. We also provide the main details of a first implementation of the proposed service-oriented solution (SCI-FI) and discuss the gathered results. Wed, 06 Mar 2013 13:15:09 GMT http://hdl.handle.net/2117/18100 2013-03-06T13:15:09Z González Cela, Alberto José; Germán Duarte, Martín; Alcober Segura, Jesús Ángel; Martin de Pozuelo, Ramon; Pinyol, Francesc; Ghafoor, Kayhan Zrar no Internet is becoming a huge heterogeneous and dynamic network that is growing beyond its architectural limits. The scaling up of the number of communicating nodes and services is leading the Internet to an architectural crisis which in turn makes it difficult to provide services efficiently considering the requirements and context conditions of users. The Information-Centric Networking (ICN) approach proposes a network where the main paradigm is not an end-to-end communication between hosts, as in the current Internet. Instead, an increasing demand for efficient distribution of content has motivated the development of architectures that focus on information objects. ICN supports the proliferation of services and contents allowing seamless access to them. This work proposes a context-aware service negotiation protocol which will enable to find and compose services whilst meeting requesters’ requirements and, consequently, maximizing the QoE of users. We also provide the main details of a first implementation of the proposed service-oriented solution (SCI-FI) and discuss the gathered results. http://hdl.handle.net/2117/18096 Title: ATENEA UPC and the new "Activity Stream" or "Wall" feature Authors: Alcober Segura, Jesús Ángel; Sanchez, Oriol; Otero, Javier; Marti, Ramon Abstract: The Universitat Politècnica de Catalunya–Barcelona Tech (UPC), has added a new feature to its ATENEA UPC e-Learning platform based on Moodle. ATENEA UPC Service is UPC’s e-Learning platform which supports the Bachelor and Master studies, both face-to-face and blended. This new feature, called "Activity Stream" or "wall", allows progress in the implementation of methodologies based on social learning and mobile learning within the field of university studies. The Institut de Ciències de la Educació (Education Sciences Institute - ICE) leads the educational aims of the platform, and UPCnet -UPC’s ICT services company- offers the service and carries out the technical evolution projects of the platform (change of versions, development of new features, ...) The ICE, teachers at UPC and UPCnet, through working groups and projects in ATENEA Teaching Innovation LABs, evolve and test the new features of the platform that will later incorporate to UPC’s ATENEA Service. The aim of this presentation is to explain the pedagogical motivation of the initiative, the feature’s design process, the technological development done and the result of the actual experience carried out between February and June 2012 within the framework of the official engineering studies taught at the Escola d'Enginyeria de Telecomunicació i Aeronàutica in Castelldefels (EETAC). Wed, 06 Mar 2013 12:08:18 GMT http://hdl.handle.net/2117/18096 2013-03-06T12:08:18Z Alcober Segura, Jesús Ángel; Sanchez, Oriol; Otero, Javier; Marti, Ramon no The Universitat Politècnica de Catalunya–Barcelona Tech (UPC), has added a new feature to its ATENEA UPC e-Learning platform based on Moodle. ATENEA UPC Service is UPC’s e-Learning platform which supports the Bachelor and Master studies, both face-to-face and blended. This new feature, called "Activity Stream" or "wall", allows progress in the implementation of methodologies based on social learning and mobile learning within the field of university studies. The Institut de Ciències de la Educació (Education Sciences Institute - ICE) leads the educational aims of the platform, and UPCnet -UPC’s ICT services company- offers the service and carries out the technical evolution projects of the platform (change of versions, development of new features, ...) The ICE, teachers at UPC and UPCnet, through working groups and projects in ATENEA Teaching Innovation LABs, evolve and test the new features of the platform that will later incorporate to UPC’s ATENEA Service. The aim of this presentation is to explain the pedagogical motivation of the initiative, the feature’s design process, the technological development done and the result of the actual experience carried out between February and June 2012 within the framework of the official engineering studies taught at the Escola d'Enginyeria de Telecomunicació i Aeronàutica in Castelldefels (EETAC). http://hdl.handle.net/2117/17541 Title: On extending ESnet's OSCARS with a multi-domain anycast service Authors: Boddie, Mark; Entel, Timothy; Guok, Chin; Lake, Andrew; Plante, Jeremy; Pouyoul, Eric; Ramaprasad, Bharath H.; Tierney, Brian; Triay Marquès, Joan; Vokkarane, Vinod M. Abstract: Current scientific data applications require advanced network provisioning systems to support the transport of large volumes of data. Due to the availability of diverse computing and Grid clusters, these applications can benefit from anycasting capabilities. In contrast to unicasting, anycast routing allows the selection of a node from a group of candidate destinations. This new means of communication allows for greater routing flexibility and better network resource consumption. However, current provisioning systems do not provide fully compliant anycast implementations. In this paper, we extend ESnet’s OSCARS virtual circuit provisioning system with anycast routing capabilities to support destination-agnostic applications on single- and multi-domain network scenarios. The proposed implementation significantly improves provisioning success over the native unicast implementation in compliance with the existing OSCARS framework. Thu, 31 Jan 2013 12:36:54 GMT http://hdl.handle.net/2117/17541 2013-01-31T12:36:54Z Boddie, Mark; Entel, Timothy; Guok, Chin; Lake, Andrew; Plante, Jeremy; Pouyoul, Eric; Ramaprasad, Bharath H.; Tierney, Brian; Triay Marquès, Joan; Vokkarane, Vinod M. no Current scientific data applications require advanced network provisioning systems to support the transport of large volumes of data. Due to the availability of diverse computing and Grid clusters, these applications can benefit from anycasting capabilities. In contrast to unicasting, anycast routing allows the selection of a node from a group of candidate destinations. This new means of communication allows for greater routing flexibility and better network resource consumption. However, current provisioning systems do not provide fully compliant anycast implementations. In this paper, we extend ESnet’s OSCARS virtual circuit provisioning system with anycast routing capabilities to support destination-agnostic applications on single- and multi-domain network scenarios. The proposed implementation significantly improves provisioning success over the native unicast implementation in compliance with the existing OSCARS framework. http://hdl.handle.net/2117/17447 Title: Leveraging 802.11n frame aggregation to enhance QoS and power consumption in Wi-Fi networks Authors: Camps Mur, Daniel; Gomony, M.D.; Pérez Costa, Xavier; Sallent Ribes, Sebastián Abstract: The Wi-Fi technology, driven by its tremendous success, is expanding into a wide variety of devices and applications. However, many of these new devices, like handheld devices, pose new challenges in terms of QoS and energy efficiency. In order to address these challenges, in this paper we study how the novel MAC aggregation mechanisms developed in the 802.11n standard can be used to enhance the current 802.11 QoS and power saving protocols. Our contribution is twofold. First, we present a simulation study that illustrates the interactions between 802.11n and the current 802.11 QoS and power saving protocols. This study reveals that the 802.11n MAC aggregation mechanisms perform better when combined with the power save mode included in the original 802.11 standard than with the 802.11e U-APSD protocol. Second, we design CA-DFA, an algorithm that, using only information available at layer two, adapts the amount of 802.11n aggregation used by a Wi-Fi station according to the level of congestion in the network. A detailed performance evaluation demonstrates the benefits of CA-DFA in terms of QoS, energy efficiency and network capacity with respect to state of the art alternatives. Mon, 21 Jan 2013 16:37:51 GMT http://hdl.handle.net/2117/17447 2013-01-21T16:37:51Z Camps Mur, Daniel; Gomony, M.D.; Pérez Costa, Xavier; Sallent Ribes, Sebastián no The Wi-Fi technology, driven by its tremendous success, is expanding into a wide variety of devices and applications. However, many of these new devices, like handheld devices, pose new challenges in terms of QoS and energy efficiency. In order to address these challenges, in this paper we study how the novel MAC aggregation mechanisms developed in the 802.11n standard can be used to enhance the current 802.11 QoS and power saving protocols. Our contribution is twofold. First, we present a simulation study that illustrates the interactions between 802.11n and the current 802.11 QoS and power saving protocols. This study reveals that the 802.11n MAC aggregation mechanisms perform better when combined with the power save mode included in the original 802.11 standard than with the 802.11e U-APSD protocol. Second, we design CA-DFA, an algorithm that, using only information available at layer two, adapts the amount of 802.11n aggregation used by a Wi-Fi station according to the level of congestion in the network. A detailed performance evaluation demonstrates the benefits of CA-DFA in terms of QoS, energy efficiency and network capacity with respect to state of the art alternatives. http://hdl.handle.net/2117/17262 Title: Optimal mapping of virtual networks with hidden hops Authors: Botero Vega, Juan Felipe; Hesselbach Serra, Xavier; Fischer, Andreas; de Meer, Hermann Abstract: Network virtualization has emerged as a solution for the Internet inability to address the required challenges caused by the lack of coordination among Internet service providers for the deployment of new services. The allocation of resources is one of the main problems in network virtualization, mainly in the mapping of virtual nodes and links to specific substrate nodes and paths, also known as the virtual network embedding problem. This paper proposes an algorithm based on optimization theory, to map the virtual links and nodes requiring a specific demand, looking for the maximization of the spare bandwidth and spare CPU in the substrate network, taking into account the CPU demanded by the hidden hops when a virtual link is mapped. The components of the virtual networks (nodes and links) that do not ask for an specific demand are then allocated following a fairness criteria Thu, 10 Jan 2013 13:11:39 GMT http://hdl.handle.net/2117/17262 2013-01-10T13:11:39Z Botero Vega, Juan Felipe; Hesselbach Serra, Xavier; Fischer, Andreas; de Meer, Hermann no Network virtualization has emerged as a solution for the Internet inability to address the required challenges caused by the lack of coordination among Internet service providers for the deployment of new services. The allocation of resources is one of the main problems in network virtualization, mainly in the mapping of virtual nodes and links to specific substrate nodes and paths, also known as the virtual network embedding problem. This paper proposes an algorithm based on optimization theory, to map the virtual links and nodes requiring a specific demand, looking for the maximization of the spare bandwidth and spare CPU in the substrate network, taking into account the CPU demanded by the hidden hops when a virtual link is mapped. The components of the virtual networks (nodes and links) that do not ask for an specific demand are then allocated following a fairness criteria http://hdl.handle.net/2117/17181 Title: On centralized schedulers for 802.11e WLANs distribution versus grouping of resources allocation Authors: Mur, D.C.; Pérez Costa, Xavier; Marchenko, V.; Sallent Ribes, Sebastián Abstract: Wireless LAN is becoming a pervasive wireless access technology that can be found in almost any mobile device such as laptops, PDAs, portable game consoles and mobile phones. Each of these groups of devices have a different set of requirements according to their intended use and applications but most of them share two main requirements: QoS support to satisfy applications’ demands and power saving functionality to achieve an operating time according to users’ expectations. IEEE 802.11e defines two centralized solutions in order to address these problems: Hybrid Coordination Channel Access (HCCA) for QoS and Scheduled Automatic Power Save Delivery (S-APSD) for power saving. The focus of our work in this paper is the analysis and evaluation of a proposed centralized scheduler that makes use of both aforementioned IEEE 802.11e QoS and power saving solutions. Our contributions are as follows: (i) Design and analytical modeling of a proposed centralized scheduler (DRA) that maximizes the minimum distance between the resource allocations with pseudopolynomial complexity, (ii) Extensive performance evaluation of the QoS and power saving benefits of the Distribution proposal (DRA) as compared to a generic Grouping one (GRA), and (iii) Evaluation of the complexity and scalability of the proposal to assess its feasibility in practice. Thu, 20 Dec 2012 15:40:48 GMT http://hdl.handle.net/2117/17181 2012-12-20T15:40:48Z Mur, D.C.; Pérez Costa, Xavier; Marchenko, V.; Sallent Ribes, Sebastián no distributed allocation, HCCA, power saving, QoS, wireless LAN Wireless LAN is becoming a pervasive wireless access technology that can be found in almost any mobile device such as laptops, PDAs, portable game consoles and mobile phones. Each of these groups of devices have a different set of requirements according to their intended use and applications but most of them share two main requirements: QoS support to satisfy applications’ demands and power saving functionality to achieve an operating time according to users’ expectations. IEEE 802.11e defines two centralized solutions in order to address these problems: Hybrid Coordination Channel Access (HCCA) for QoS and Scheduled Automatic Power Save Delivery (S-APSD) for power saving. The focus of our work in this paper is the analysis and evaluation of a proposed centralized scheduler that makes use of both aforementioned IEEE 802.11e QoS and power saving solutions. Our contributions are as follows: (i) Design and analytical modeling of a proposed centralized scheduler (DRA) that maximizes the minimum distance between the resource allocations with pseudopolynomial complexity, (ii) Extensive performance evaluation of the QoS and power saving benefits of the Distribution proposal (DRA) as compared to a generic Grouping one (GRA), and (iii) Evaluation of the complexity and scalability of the proposal to assess its feasibility in practice. http://hdl.handle.net/2117/17176 Title: Magnetic induction for underwater wireless communication networks Authors: Domingo Aladrén, Mari Carmen Abstract: Although acoustic waves are the most versatile and widely used physical layer technology for underwater wireless communication networks (UWCNs), they are adversely affected by ambient noise, multipath propagation, and fading. The large propagation delays, low bandwidth, and high bit error rates of the underwater acoustic channel hinder communication as well. These operational limits call for complementary technologies or communication alternatives when the acoustic channel is severely degraded. Magnetic induction (MI) is a promising technique for UWCNs that is not affected by large propagation delays, multipath propagation, and fading. In this paper, the MI communication channel has been modeled. Its propagation characteristics have been compared to the electromagnetic and acoustic communication systems through theoretical analysis and numerical evaluations. The results prove the feasibility of MI communication in underwater environments. The MI waveguide technique is developed to reduce path loss. The communication range between source and destination is considerably extended to hundreds of meters in fresh water due to its superior bit error rate performance. Thu, 20 Dec 2012 14:03:51 GMT http://hdl.handle.net/2117/17176 2012-12-20T14:03:51Z Domingo Aladrén, Mari Carmen no Although acoustic waves are the most versatile and widely used physical layer technology for underwater wireless communication networks (UWCNs), they are adversely affected by ambient noise, multipath propagation, and fading. The large propagation delays, low bandwidth, and high bit error rates of the underwater acoustic channel hinder communication as well. These operational limits call for complementary technologies or communication alternatives when the acoustic channel is severely degraded. Magnetic induction (MI) is a promising technique for UWCNs that is not affected by large propagation delays, multipath propagation, and fading. In this paper, the MI communication channel has been modeled. Its propagation characteristics have been compared to the electromagnetic and acoustic communication systems through theoretical analysis and numerical evaluations. The results prove the feasibility of MI communication in underwater environments. The MI waveguide technique is developed to reduce path loss. The communication range between source and destination is considerably extended to hundreds of meters in fresh water due to its superior bit error rate performance. http://hdl.handle.net/2117/17166 Title: Energy efficient virtual network embedding Authors: Botero Vega, Juan Felipe; Hesselbach Serra, Xavier; Duelli, Michael; Schlosser, Daniel; Fischer, A.; de Meer, Hermann Abstract: Waste of energy due to over-provisioning and overdimensioning of network infrastructures has recently stimulated the interest on energy consumption reduction by Internet Service Providers (ISPs). By means of resource consolidation, network virtualization based architectures will enable energy saving. In this letter, we extend the well-known virtual network embedding problem (VNE) to energy awareness and propose a mixed integer program (MIP) which provides optimal energy efficient embeddings. Simulation results show the energy gains of the proposed MIP over the existing cost-based VNE approach. Wed, 19 Dec 2012 19:13:45 GMT http://hdl.handle.net/2117/17166 2012-12-19T19:13:45Z Botero Vega, Juan Felipe; Hesselbach Serra, Xavier; Duelli, Michael; Schlosser, Daniel; Fischer, A.; de Meer, Hermann no Energy efficiency, Green networking, Mixed integer programming, Network virtualization, Virtual network embedding Waste of energy due to over-provisioning and overdimensioning of network infrastructures has recently stimulated the interest on energy consumption reduction by Internet Service Providers (ISPs). By means of resource consolidation, network virtualization based architectures will enable energy saving. In this letter, we extend the well-known virtual network embedding problem (VNE) to energy awareness and propose a mixed integer program (MIP) which provides optimal energy efficient embeddings. Simulation results show the energy gains of the proposed MIP over the existing cost-based VNE approach. http://hdl.handle.net/2117/17159 Title: Throughput efficiency in body sensor networks: a clean-slate approach Authors: Domingo Aladrén, Mari Carmen Abstract: In this paper, a flexible role-based architecture for Body Sensor Networks (BSNs) is introduced. The proposed non-layered context-aware architecture is application-oriented and able to incorporate future applications. Particular applications have certain requirements. Functional units (roles) instead of protocol layers are designed to perform the required tasks for applications to work properly. The role data of an application is inserted in the role headers of the container and is available for other applications with the same basic, specific or particular roles. Furthermore, the performance of Automatic Repeat Request (ARQ), Forward Error Correction (FEC) block codes and FEC convolutional codes with respect to the throughput efficiency has also been analyzed for a BSN following the proposed role-based architecture. The numerical results show that the proposed role-based architecture outperforms the traditional layered architecture with respect to the throughput efficiency for all error control schemes. FEC block codes are able to maintain a high throughput efficiency over longer distances because the hop length extension technique is applied. Wed, 19 Dec 2012 17:00:29 GMT http://hdl.handle.net/2117/17159 2012-12-19T17:00:29Z Domingo Aladrén, Mari Carmen no ARQ, Bit error rate, FEC, Packet error rate, Packet size optimization, Role-based architecture, Sensor networks, Throughput efficiency In this paper, a flexible role-based architecture for Body Sensor Networks (BSNs) is introduced. The proposed non-layered context-aware architecture is application-oriented and able to incorporate future applications. Particular applications have certain requirements. Functional units (roles) instead of protocol layers are designed to perform the required tasks for applications to work properly. The role data of an application is inserted in the role headers of the container and is available for other applications with the same basic, specific or particular roles. Furthermore, the performance of Automatic Repeat Request (ARQ), Forward Error Correction (FEC) block codes and FEC convolutional codes with respect to the throughput efficiency has also been analyzed for a BSN following the proposed role-based architecture. The numerical results show that the proposed role-based architecture outperforms the traditional layered architecture with respect to the throughput efficiency for all error control schemes. FEC block codes are able to maintain a high throughput efficiency over longer distances because the hop length extension technique is applied. http://hdl.handle.net/2117/16849 Title: Evaluación de la implementación de los principios de igualdad de oportunidades y accesibilidad universal en los planes de estudio de los títulos de grado de las universidades españolas Authors: Guasch Murillo, Daniel; Dotras Ruscalleda, Pilar; Àlvarez Suau, Maria Hortènsia; Guasch Murillo, Yolanda Abstract: Se presentan los resultados del estudio realizado por el Observatorio Universidad y Discapacidad para determinar el grado de implementación del principio de igualdad de oportunidades por razón de discapacidad y de accesibilidad universal en los planes de estudio de las titulaciones de grado de las universidades públicas españolas y se formulan propuestas que permitan verificar, en mayor medida, la aplicación de dichos principios. Wed, 07 Nov 2012 08:29:47 GMT http://hdl.handle.net/2117/16849 2012-11-07T08:29:47Z Guasch Murillo, Daniel; Dotras Ruscalleda, Pilar; Àlvarez Suau, Maria Hortènsia; Guasch Murillo, Yolanda no igualdad de oportunidades, accesibilidad universal, grados universitarios equal opportunities, universal accessibility, undergraduate degrees Se presentan los resultados del estudio realizado por el Observatorio Universidad y Discapacidad para determinar el grado de implementación del principio de igualdad de oportunidades por razón de discapacidad y de accesibilidad universal en los planes de estudio de las titulaciones de grado de las universidades públicas españolas y se formulan propuestas que permitan verificar, en mayor medida, la aplicación de dichos principios. http://hdl.handle.net/2117/16429 Title: Economía de la accesibilidad 20+20 : marco teórico Authors: Guasch Murillo, Daniel; Berbegal Mirabent, Jasmina; Villalta, Marta Wed, 05 Sep 2012 07:41:05 GMT http://hdl.handle.net/2117/16429 2012-09-05T07:41:05Z Guasch Murillo, Daniel; Berbegal Mirabent, Jasmina; Villalta, Marta no http://hdl.handle.net/2117/16217 Title: Comparacion de algoritmos para el mapeo de redes virtuales Authors: Botero Vega, Juan Felipe; Hesselbach Serra, Xavier Abstract: La virtualizacion de red es reconocida como una de las principales tecnologías que formara parte del Internet del futuro. Mediante ella, la actual inhabilidad de Internet para desarrollar e implementar nuevos servicios, causada por la falta de coordinacion entre los proveedores de servicio, podrá ser superada. Aplicar virtualización a los recursos de red nos lleva al problema de asignacion de recursos consistente en asignar (mapear) de manera optima los recursos de la red física a los nodos y enlaces de las redes virtuales, comunmente este problema se ha denominado “problema de incrustar o mapear redes virtuales”. En este artículo se muestran las principales estrategias que han sido propuestas para resolver de manera optima este problema y se comparan teniendo en cuenta varias metricas. Mon, 09 Jul 2012 16:26:20 GMT http://hdl.handle.net/2117/16217 2012-07-09T16:26:20Z Botero Vega, Juan Felipe; Hesselbach Serra, Xavier no La virtualizacion de red es reconocida como una de las principales tecnologías que formara parte del Internet del futuro. Mediante ella, la actual inhabilidad de Internet para desarrollar e implementar nuevos servicios, causada por la falta de coordinacion entre los proveedores de servicio, podrá ser superada. Aplicar virtualización a los recursos de red nos lleva al problema de asignacion de recursos consistente en asignar (mapear) de manera optima los recursos de la red física a los nodos y enlaces de las redes virtuales, comunmente este problema se ha denominado “problema de incrustar o mapear redes virtuales”. En este artículo se muestran las principales estrategias que han sido propuestas para resolver de manera optima este problema y se comparan teniendo en cuenta varias metricas. http://hdl.handle.net/2117/16216 Title: A squatting based framework to enhance network virtualization allocation in optical networks Authors: Hesselbach Serra, Xavier; Naumenko, Nikolay Abstract: This paper introduces a framework to enhance network virtualization allocation in optical networks. A new control plane approach for the new generation of electrical and optical networks technologies is presented. To increase resources utilization efficiency, a new layer above virtualized elements is introduced in order to take into account the demands in order to control the resources and infrastructures below. For that layer, a strategy based on a resource squatting model is presented. Mon, 09 Jul 2012 16:23:08 GMT http://hdl.handle.net/2117/16216 2012-07-09T16:23:08Z Hesselbach Serra, Xavier; Naumenko, Nikolay no This paper introduces a framework to enhance network virtualization allocation in optical networks. A new control plane approach for the new generation of electrical and optical networks technologies is presented. To increase resources utilization efficiency, a new layer above virtualized elements is introduced in order to take into account the demands in order to control the resources and infrastructures below. For that layer, a strategy based on a resource squatting model is presented.