901 resultados para Multimedia archive


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L'objectiu del projecte que s'exposa és el de crear serveis bibliotecaris virtuals, per donar suport a l'activitat docent i acadèmica dels estudis del Graduat Multimèdia a Distància oferts per la Fundació Politècnica de Catalunya (FPC) i la Universitat Oberta de Catalunya.

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Presentació de les dues noves plataformes desenvolupades per la Biblioteca de la Universitat de Las Palmas de Gran Canaria: ACCEDA (documentació científica de la ULPGC en accés obert) i BUSTREAMING (documentació multimèdia). Aquestes són dues noves iniciatives de la Biblioteca Universitària emmarcades dins del moviment Open Access, que se sumen a la ja existent Memòria Digital de Canàries, que es va iniciar l'any 2003 amb molt d'èxit. Tot i que el programari utilitzat per al desenvolupament d'ACCEDA és DSpace, la Biblioteca Universitària ha implementat serveis als usuaris i administradors, com per exemple, la possibilitat de dipositar documents sense haver d'utilitzar l'autoarxivament i la incorporació de l'eina BUStreaming desenvolupada per la pròpia Biblioteca.

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Este proyecto surge de la necesidad de mejorar un CardStoring ya existente de forma que, mediante un servidor, podamos usarlo de forma remota, y poder separar la aplicación en dos partes; ya que hasta el momento se encontraba en una sola. Con esto se consigue que la creación de las tarjetas pase desapercibida para el usuario y que a éste le resulte más simple el uso de esta aplicación. Con esto, se lograría que la aplicación pueda ser distribuida de forma Web. También será modificado el tipo de tarjetas para poder introducir sonidos, videos e imágenes. Con lo cual conseguimos adaptar el proyecto a personas discapacitadas como pueden ser sordos e invidentes además de aportar un uso más amplio a cada una de las tarjetas.

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Una aproximación a lo que serán las redacciones del futuro de los medios de comunicación. Nos acercamos a un medio especializado en África, GuinGuinBali.com, que informa en tres idiomas paralelamente, con la versión original de la noticia y traducciones profesionales. Otra forma de entender la comunicación para subsistir en la era online. Proponemos otra mirada hacia África, sin olvidar la realidad, pero resaltando los aspectos más positivos del continente, potenciando y difundiendo su diversidad cultural. Información de África contada por africanos. Les mostraremos como aprovechar la demanda de los lectores gracias a las redes sociales y el nacimiento de un nuevo modelo de negocio que democratiza los medios de comunicación. Analizamos el momento actual en los medios de comunicación, en el que tenemos una oportunidad en nuestras manos que no debemos perder.

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Mountain ranges are biodiversity hotspots worldwide and provide refuge to many organisms under contemporary climate change. Gathering field information on mountain biodiversity over time is of primary importance to understand the response of biotic communities to climate changes. For plants, several long-term observation sites and networks of mountain biodiversity are emerging worldwide to gather field data and monitor altitudinal range shifts and community composition changes under contemporary climate change. Most of these monitoring sites, however, focus on alpine ecosystems and mountain summits, such as the global observation research initiative in alpine environments (GLORIA). Here we describe the Alps Vegetation Database, a comprehensive community level archive (GIVD ID EU-00-014) which aims at compiling all available geo-referenced vegetation plots from lowland forests to alpine grasslands across the greatest mountain range in Europe: the Alps. This research initiative was funded between 2008 and 2011 by the Danish Council for Independent Research and was part of a larger project to compare cross-scale plant community structure between the Alps and the Scandes. The Alps Vegetation Database currently harbours 35,731 geo-referenced vegetation plots and 5,023 valid taxa across Mediterranean, temperate and alpine environments. The data are mainly used by the main contributors of the Alps Vegetation Database in an ecoinformatics approach to test hypotheses related to plant macroecology and biogeography, but external proposals for joint collaborations are welcome.

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This PhD thesis addresses the issue of scalable media streaming in large-scale networking environments. Multimedia streaming is one of the largest sink of network resources and this trend is still growing as testified by the success of services like Skype, Netflix, Spotify and Popcorn Time (BitTorrent-based). In traditional client-server solutions, when the number of consumers increases, the server becomes the bottleneck. To overcome this problem, the Content-Delivery Network (CDN) model was invented. In CDN model, the server copies the media content to some CDN servers, which are located in different strategic locations on the network. However, they require heavy infrastructure investment around the world, which is too expensive. Peer-to-peer (P2P) solutions are another way to achieve the same result. These solutions are naturally scalable, since each peer can act as both a receiver and a forwarder. Most of the proposed streaming solutions in P2P networks focus on routing scenarios to achieve scalability. However, these solutions cannot work properly in video-on-demand (VoD) streaming, when resources of the media server are not sufficient. Replication is a solution that can be used in these situations. This thesis specifically provides a family of replication-based media streaming protocols, which are scalable, efficient and reliable in P2P networks. First, it provides SCALESTREAM, a replication-based streaming protocol that adaptively replicates media content in different peers to increase the number of consumers that can be served in parallel. The adaptiveness aspect of this solution relies on the fact that it takes into account different constraints like bandwidth capacity of peers to decide when to add or remove replicas. SCALESTREAM routes media blocks to consumers over a tree topology, assuming a reliable network composed of homogenous peers in terms of bandwidth. Second, this thesis proposes RESTREAM, an extended version of SCALESTREAM that addresses the issues raised by unreliable networks composed of heterogeneous peers. Third, this thesis proposes EAGLEMACAW, a multiple-tree replication streaming protocol in which two distinct trees, named EAGLETREE and MACAWTREE, are built in a decentralized manner on top of an underlying mesh network. These two trees collaborate to serve consumers in an efficient and reliable manner. The EAGLETREE is in charge of improving efficiency, while the MACAWTREE guarantees reliability. Finally, this thesis provides TURBOSTREAM, a hybrid replication-based streaming protocol in which a tree overlay is built on top of a mesh overlay network. Both these overlays cover all peers of the system and collaborate to improve efficiency and low-latency in streaming media to consumers. This protocol is implemented and tested in a real networking environment using PlanetLab Europe testbed composed of peers distributed in different places in Europe.

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Selostus: Pohjoismaisen geenipankin Prunus-kokoelma Suomessa : 1. Hapankirsikkakannat

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Selostus: Pohjoismaisen geenipankin Prunus-kokoelma Suomessa : 1. Luumukannat

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El objetivo fundamental de este artículo es el de definir la estructura de la comunicación audiovisual actual, fruto de unas coordenadas contextuales de carácter político, tecnológico y también social. Nos centraremos en el análisis de la estructura del sistema multimedial global que interfiere directamente en los procesos de producción y consumo de los productos audiovisuales. Éstos, inscritos dentro de una lógica capitalista, distribuidos y pensados a escala global, contribuyen en el proceso de industrialización de la cultura y, en concreto, la comunicación. En consecuencia aparece el asentamiento de una nueva doctrina: la del imperialismo financiero que se encuentra detrás del pensamiento único.

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Multimedia-sanomanvälityspalvelu (MMS) on matkapuhelinten väliseen viestintään kehitetty palvelu, joka mahdollistaa yhteyden Internet maailmaan. Multimedia-sanomanvälityspalvelua voidaan käyttää luomaan yhteys matkapuhelimen käyttäjän ja ulkoisen sovelluspalvelimen välille. MMS voidaan nähdä sovelluksena, joka yhdistää multimediaviestin luonnin, käsittelyn sekä toimituksen monelle eri sisältö tyypille. Multimedia-viestikeskus (MMSC) on uusi verkkoelementti, joka on vastuussa multimediaviestien varastoinnista ja toimituksesta. Multimedia-viestikeskuksella on kolme loogista elementtiä, jotka ovat välityspalvelin, sovellusrajapinnat ja matkapuhelinverkkorajapinta. Operaattorit sekä kolmannen osapuolen sovelluskehittäjät voivat kehittää lisäarvopalveluita multimedia-sanomanvälityspalvelulle hyödyntämällä sovellusrajapintoja. Sovellusrajapinnat perustuvat olemassa oleviin Internet protokolliin. Tämä diplomityö tutkii Multimedia-sanomanvälityspalvelun verkkoelementtien rajapintoja. Tulevaisuudessa on tarkoitus lisätä Multimedia-sanomanvälityspalvelun verkkoelementtejä sähköisen kaupankäynnin kehysarkkitehtuuriin, joka perustuu komponentteihin.

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The thesis presents an overview of third generation of IP telephony. The architecture of 3G IP Telephony and its components are described. The main goal of the thesis is to investigate the interface between the Call Processing Server and Multimedia IP Networks. The interface functionality, proposed protocol stack and a general description are presented in the thesis. To provide useful services, 3G IP Telephony requires a set of control protocols for connection establishment, capabilities exchange and conference control. The Session Initiation Protocol (SIP) and the H.323 are two protocols that meet these needs. In the thesis these two protocols are investigated and compared in terms of Complexity, Extensibility, Scalability, Services, Resource Utilization and Management.