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Accès et adaptation de contenus multimédia pour les systèmes pervasifs
| Content Provider | Semantic Scholar |
|---|---|
| Author | Girma, Berhe |
| Copyright Year | 2006 |
| Abstract | In this thesis, we present a software architecture of multimedia content adaptation (called DCAF: Distributed Content Adaptation Framework). This architecture is based on the use of Internet accessible adaptation services. Unlike in the previous approaches where the client, content server or a proxy is responsible for the adaptation process, in this architecture externally developed services carry out the content transformation. DCAF thus provides a general content adaptation solution offering flexibility, scalability, extensibility and interoperability. The principal problem is the determination of optimal service configuration (also called optimal adaptation path) provided that there are a number of possible service configurations and several adaptation services can provide the same functionalities. This thesis proposes to adopt an Artificial Intelligence (AI) technique to optimize the planning, the composition and the execution of the services to adapt the content. The algorithm proposed takes into account the profile of the user, the characteristics of the devices, the connectivity of the network, the format of the exchanged contents and the specifications (cost, quality) of the available adaptation services to build a graph of adaptation modelling the selected scenario of adaptation. In parallel, we developed an ontology for the description of adaptation services. This ontology makes it possible to describe the adaptation services semantically and finally to facilitate the discovery and the composition of the services. It also makes it possible to translate easily the services description to planning operator representation. To demonstrate the feasibility of DCAF, a prototype has been implemented and tested. In addition to the openness, scalability, flexibility and interoperability of the framework, experiments show that the average processing time for adaptation services and the adaptation graph construction time suggest that with some performance enhancement such as optimization of message exchange the service-based framework is of a reasonable performance and can be used in pervasive computing environments. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://csidoc.insa-lyon.fr/these/2006/girma/these.pdf |
| Alternate Webpage(s) | http://docinsa.insa-lyon.fr/these/2006/girma/these.pdf |
| Alternate Webpage(s) | https://sophia.javeriana.edu.co/~acarrillo/Personalizacion/Articulos/berhe.pdf |
| Alternate Webpage(s) | http://theses.insa-lyon.fr/publication/2006ISAL0056/these.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
