Multimedia Services with QoS Support in an Integrated Terrestrial and Satellite UMTS Network: The IST VIRTUOUS Project

One of the main challenges of the wireless telecommunication systems which are presently being designed, is an efficient provision of an end-to-end QoS tailored to the specific requirements of each connection. For this purpose, one of the main goals of the European Union IST Research Project VIRTUOUS was the investigation and development of procedures for the QoS support in the UMTS system. This paper deals with the description of the QoS architecture designed for the IST VIRTUOUS system, especially targeting at the design of an efficient UMTS MAC scheduling algorithm that is in charge of managing several parallel active logical channels (i.e. UMTS connections) respecting their relevant QoS constraints. The joined approach to the packet scheduling and Transport Format choice proposed in this paper shows better performances respect to the 3GPP standard solution. The last one gives poor results as the number of connections of different type - i.e. connections with different needs in terms of maximum allowed delay - increases. Furthermore, the innovative MAC design introduced in this paper allows a much better exploitation of the available bandwidth in the UMTS Radio Access Network, increasing also fairness between IP datagrams belonging to different sources

EFFETTO TEMPORALE DELL'ACETATO DI CIPROTERONE SULL'ATTIVITA' DELLA ß-GLUCURONIDASI E DELLA MALATO-DEIDROGENASI NELL'IPOTALAMO DEL TOPO MASCHIO ADULTO

VENGONO ILLUSTRATE LE VARIAZIONI DELL'ATTIVITA' DI DUE ENZIMI ORMONO-DIPENDENDENTI NEL SISTEMA IPOTALAMO -IPOFISARIO DI TOPO MASCHIO ADULT

Matching di colore e luce: un percorso per comprendere l'interazione tra luce e materia attraverso la metodologia IBSE

Capire l’interazione della luce con la materia è molto importante per i ragazzi, perché, nonostante il colore sia un’esperienza che essi vivono quotidianamente, non ne comprendono,però,pienamente il fenomeno.Il percorso didattico ha coinvolto un gruppo di studenti liceali,ed ha sperimentato l’innovativa metodologia didattica IBSE (Inquiry Based Science Education),un approccio didattico basato sull’investigazione.Le aspettative del corso sono quelle di motivare gli studenti allo studio della fisica,e di migliorare il percorso di apprendimento.L’iniziale“engagement”del percorso ha prodotto molto entusiasmo nel gruppo di studenti,che sono stati accompagnati,durante le altre tre fasi explore,extend e evaluate,con proposte di task molto accattivanti. Con la presente comunicazione vogliamo condividere le fasi sperimentali del percorso didattico e il report sul feedback degli studenti

SAILOR project general architecture: Simulation and emulation of an integrated T/S-UMTS system based on an innovative fully IP core network

The SAILOR project will implement a demonstrator, aiming at a complete integration between T-UMTS & S-UMTS. The demonstrator will add new functionalities that will exploit more efficiently the utilization of the satellite segment, provide a meaningful environment to implement more advanced multimedia services (broadcast, multicast) and allow a more advanced implementation of the UMTS Core Network. The demonstrator will consist of a real UMTS Core Network, to be developed through a completely innovative approach and of two emulated Access Networks. Moreover, in the framework of SAILOR project, an advanced Call Admission Control algorithm and an innovative Cellular Planning tool will be designed and implemented. At this purpose a proper Terrestrial and Satellite UMTS Access Network software simulator will be developed and implemented, with the goal of validating the abovementioned algorithms. Two experiments will be carried out: Fully IP Based Core Network Experiment and Access Network Resources (satellite-terrestrial) Optimisation Experiment. In this paper the overall project will be described with particular attention to the two foreseen experiments and to the main concepts at the basis of them