Rui Jorge Lopes

Publications

• Assessing the integration of ontology tools in content network architectures.

  Eduardo Ribeiro, Rui Jorge Lopes

  Proceedings of EUROCON 2011, International Conference on Computer as a Tool, 27-29 April 2011, Lisbon, Portugal; 01/2011

• An architecture for the provision of content networks based on IMS, metadata, presence and P2P technologies

  Eduardo Ribeiro, Rui J. Lopes

  Proceedings of the Workshop on Middleware for Next-Generation Converged Networks and Applications, MNCNA 2007, Newport Beach, CA, USA; 01/2007

  The Internet is currently being designed and used in a way that is strongly influenced by inter-personal communications and content-based services. Content Networks, having presence and audiovisual metadata descriptions as central concepts, can play an important role in the provision of these servic... [more] The Internet is currently being designed and used in a way that is strongly influenced by inter-personal communications and content-based services. Content Networks, having presence and audiovisual metadata descriptions as central concepts, can play an important role in the provision of these services. Existing standards from the ISO/IEC MPEG (MPEG-7,-21) and IETF (PIDF, RPID) provide the technologies for these elementary features. This paper contributes to the deployment of Content Networks by proposing a layered architecture where the IMS Multimedia Subsystem and P2P-based midlleware tackle the problem of terminal, networks heterogeneity and the integration of different presence and metadata tools. The P2P-based middleware is used to construct autonomously self-organized, context and interest based communities by providing overlay infrastructures for the interconnection of different Content Networks components. The results obtained from implementing this architecture using Open IMS Core and Scribe open platforms show that the proposed architecture can be used for the creation and deployment of services on Content Networks.
• 2.55

  Impact points

  The utility of MPEG-7 systems in audio-visual applications with multiple streams

  R.J. Lopes, A.T. Lindsay, D. Hutchison

  Circuits and Systems for Video Technology, IEEE Transactions on. 02/2003;

  The MPEG-7 standard presents several interesting challenges with regard to manipulating multimedia content descriptions. We discuss two exemplary applications for MPEG-7: personalized TV services and video surveillance. In doing so, we introduce some capabilities into the standard that test the limi... [more] The MPEG-7 standard presents several interesting challenges with regard to manipulating multimedia content descriptions. We discuss two exemplary applications for MPEG-7: personalized TV services and video surveillance. In doing so, we introduce some capabilities into the standard that test the limits of the current models, namely those of multiple streams and those of carouseling and synch-points. We then introduce proposed extensions that facilitate these additional functionalities, and explore their impact upon the models within the standard.

• Bandwidth Measurements of ALM Trees for Content Distribution.

  Rui J. Lopes, Laurent Mathy, David Hutchison

  Protocols for Multimedia Systems, 6th International Conference, PROMS 2001, Enschede, The Netherlands, October 17-19, 2001, Proceedings; 01/2001

• Inter-agent communication in a FIPA compliant intelligent distributed

  Lus M. Botelho, Rui J. Lopes, Manuel M. Sequeira, Paulo F. Almeida, Srgio Martins

  10/1999;

  This paper describes a traffic surveillance system as a particular case of the class of intelligent distributed dynamic-information systems (IDDIS). The Traffic Surveillance System is a vision-based FIPA compliant multi-agent system that uses the FIPA Agent Communication Language (ACL) and the FIPA ... [more] This paper describes a traffic surveillance system as a particular case of the class of intelligent distributed dynamic-information systems (IDDIS). The Traffic Surveillance System is a vision-based FIPA compliant multi-agent system that uses the FIPA Agent Communication Language (ACL) and the FIPA Semantic Language (SL). The focus of the work is inter-agent communication and coordination. We have extended the SL expressiveness with respect to the representation of uncertainty and to the representation of ad hoc MPEG7 descriptions. We propose a transport encoding format more suitable for time-constrained systems than the original textual format proposed in the FIPA specifications. We show that, within the scope of the FIPA platform, the FIPA ACL is a communication language powerful enough to achieve multi-agent coordination through communication. This work also suggests that the FIPA platform is suitable for building surveillance based applications.

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