Deployment of NFV and SFC scenarios

Aquest ítem conté el treball original, defensat públicament amb data de 24 de febrer de 2017, així com una versió millorada del mateix amb data de 28 de febrer de 2017. Els canvis introduïts a la segona versió són 1) correcció d'errades 2) procediment del darrer annex.Telecommunications services have been traditionally designed linking hardware devices and providing mechanisms so that they can interoperate. Those devices are usually specific to a single service and are based on proprietary technology. On the other hand, the current model works by defining standards and strict protocols to achieve high levels of quality and reliability which have defined the carrier-class provider environment. Provisioning new services represent challenges at different levels because inserting the required devices involve changes in the network topology. This leads to slow deployment times and increased operational costs. To overcome the current burdens network function installation and insertion processes into the current service topology needs to be streamlined to allow greater flexibility. The current service provider model has been disrupted by the over-the-top Internet content providers (Facebook, Netflix, etc.), with short product cycles and fast development pace of new services. The content provider irruption has meant a competition and stress over service providers' infrastructure and has forced telco companies to research new technologies to recover market share with flexible and revenue-generating services. Network Function Virtualization (NFV) and Service Function Chaining (SFC) are some of the initiatives led by the Communication Service Providers to regain the lost leadership. This project focuses on experimenting with some of these already available new technologies, which are expected to be the foundation of the new network paradigms (5G, IOT) and support new value-added services over cost-efficient telecommunication infrastructures. Specifically, SFC scenarios have been deployed with Open Platform for NFV (OPNFV), a Linux Foundation project. Some use cases of the NFV technology are demonstrated applied to teaching laboratories. Although the current implementation does not achieve a production degree of reliability, it provides a suitable environment for the development of new functional improvements and evaluation of the performance of virtualized network infrastructures

Deployment of NFV and SFC scenarios

Aquest ítem conté el treball original, defensat públicament amb data de 24 de febrer de 2017, així com una versió millorada del mateix amb data de 28 de febrer de 2017. Els canvis introduïts a la segona versió són 1) correcció d'errades 2) procediment del darrer annex.Telecommunications services have been traditionally designed linking hardware devices and providing mechanisms so that they can interoperate. Those devices are usually specific to a single service and are based on proprietary technology. On the other hand, the current model works by defining standards and strict protocols to achieve high levels of quality and reliability which have defined the carrier-class provider environment. Provisioning new services represent challenges at different levels because inserting the required devices involve changes in the network topology. This leads to slow deployment times and increased operational costs. To overcome the current burdens network function installation and insertion processes into the current service topology needs to be streamlined to allow greater flexibility. The current service provider model has been disrupted by the over-the-top Internet content providers (Facebook, Netflix, etc.), with short product cycles and fast development pace of new services. The content provider irruption has meant a competition and stress over service providers' infrastructure and has forced telco companies to research new technologies to recover market share with flexible and revenue-generating services. Network Function Virtualization (NFV) and Service Function Chaining (SFC) are some of the initiatives led by the Communication Service Providers to regain the lost leadership. This project focuses on experimenting with some of these already available new technologies, which are expected to be the foundation of the new network paradigms (5G, IOT) and support new value-added services over cost-efficient telecommunication infrastructures. Specifically, SFC scenarios have been deployed with Open Platform for NFV (OPNFV), a Linux Foundation project. Some use cases of the NFV technology are demonstrated applied to teaching laboratories. Although the current implementation does not achieve a production degree of reliability, it provides a suitable environment for the development of new functional improvements and evaluation of the performance of virtualized network infrastructures

Utopías para el siglo XXI = Utopies per al segle XXI

Dossier realitzat pels estudiants de l'assignatura "Utopia i Vanguàrdia" (any acadèmic 2018-2019) del Grau d'Estudis en Arquitectura de la Universitat de Girona.Professora responsable: Marisa García VergaraMarisa García Vergara, docent del curs Adriana Vázquez Balló i Fèlix Breton Coll, assistents de docència Disseny i maquetació: Júlia Capdevila, Aina Brugués i Lídia PérezEste dossier recoge algunas experiencias arquitectónicas y urbanísticas que se han planteado en las últimas décadas, que se entroncan en la nutrida vertiente de las propuestas utópicas en nuestro campo de estudios en el último cuarto de siglo hasta la actualidadThis dossier gathers some architectural and urbanistic experiences that have been raised in the last decades, which are linked in the nourished slope of the utopian proposals in our field of studies in the last quarter of the century until toda

Utopías para el siglo XXI = Utopies per al segle XXI

Dossier realitzat pels estudiants de l'assignatura "Utopia i Vanguàrdia" (any acadèmic 2018-2019) del Grau d'Estudis en Arquitectura de la Universitat de Girona.Professora responsable: Marisa García VergaraMarisa García Vergara, docent del curs Adriana Vázquez Balló i Fèlix Breton Coll, assistents de docència Disseny i maquetació: Júlia Capdevila, Aina Brugués i Lídia PérezEste dossier recoge algunas experiencias arquitectónicas y urbanísticas que se han planteado en las últimas décadas, que se entroncan en la nutrida vertiente de las propuestas utópicas en nuestro campo de estudios en el último cuarto de siglo hasta la actualidadThis dossier gathers some architectural and urbanistic experiences that have been raised in the last decades, which are linked in the nourished slope of the utopian proposals in our field of studies in the last quarter of the century until toda

Coherent vector pi-pulse in optical amplifiers

We obtain an exact linearly polarized vector solitary solution for the amplification of an optical pulse with a time width short compared with both population and polarization decay time. This dissipative soliton results from the balance between the gain from inverted resonant two-level atoms and the linear loss of the host material. We suppose that the excited state of the active centers is degenerate on the projection of the angular momentum, with a symmetric state of inversion. Quite remarkably, we find that after the passing of the pulse, the atomic medium does not return to the ground state, and a finite Zeeman coherence is generated. Numerical simulations demonstrate the stability of vector π solitons with an arbitrary state of elliptical polarization in the presence of both linear birefringence and group-velocity dispersion of the host material