Tomás de Miguel

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The 3GPP has specified the IP multimedia subsystem (IMS) for the provisioning of multimedia services in UMTS Release 5 and later. Interconnection at the service layer between 3GPP and LAN networks requires interworking between IMS and WLAN functionalities. Studying several interconnection scenarios and the main functionalities of IMS, this article analyzes(More)
Isabel is a P2P like multipoint group collaboration tool for the Internet, which implements an innovative service concept for synchronous collaborations based on a flexible and programmable floor control. This approach leads to a more natural and effective management of collaboration sessions. The flexible and programmable floor control incorporates the(More)
Introduction Many activities which in the past have required physical presence and direct interaction among participants can be performed in a distributed fashion with the help of advanced information technologies such as, CSCW [1,2] (Computer Supported Cooperative Work), interactive multimedia services and broadband communications. Technologies aiming at(More)
Users are looking towards ATM technology as a suitable solution for specific applications in the new field of distributed multimedia. The aim of ISABEL is to take benefit of the new broadband technology in order to provide a good access to new distributed multimedia facilities. The application has been developed to cover two main fields: distance learning(More)
This paper describes the use of ISABEL in an heterogeneous network context where different QoSs are used to connect different participants in a real-time interactive collaboration based on videoconferencing. As ISABEL uses TCP-UDP/IP to interconnect different network technologies and no QoS control exists, a QoS adaptation function has been added: the(More)
EducaNext is an educational mediator created within the UNIVERSAL IST Project which supports both, the exchange of reusable educational materials based on open standards, as well as the collaboration of educators over the network in the realization of educational activities. The Isabel CSCW application is a group collaboration tool for the Internet(More)
In this paper we present a translation from high-level specifications written in the formal description technique LOTOS to hardware descriptions in the standard language VHDL. The objective is to use the formal foundation of LOTOS in order to improve the design phase of hardware components. VHDL is used as an intermediate step, taking advantage of the(More)