Recently, various schemes for broadcasting continuous media data such as audio and video have been studied. Some of them have focused on reducing the waiting time of clients under the condition that clients can play data without interruption from beginning to end. These schemes usually employ multiple channels to broadcast continuous media data. However, clients for most broadcast systems such as wireless LAN, DVB and ISDB-T cannot receive data from multiple channels concurrently. In this paper, we propose and evaluate a scheduling scheme to reduce the waiting time of clients with a single channel. Preliminary results suggest that this scheme outperforms existing schemes.
Due to the recent proliferation of digital broadcasting systems, various schemes for broadcasting continuous media data such as music or movies have been studied. In general broadcasting systems, since clients have to wait until their desired data are broadcast, these schemes reduce the waiting time by dividing the data into several segments of equal size. However, continuous media data often have units for playing portions of the data. For example, data encoded by MPEG2 can be played every GOP (Group of Pictures). In this paper, we propose a scheme to reduce the waiting time considering the units. Our proposed scheme divides a continuous media data at every unit. By scheduling divided data so that clients finish receiving a unit before starting to play the unit, waiting time is effectively reduced.
As one of the new technologies t o make good use of broader channel bandwidth of recent networks, dynamic relocation of databases through networks, which we call database migration, will soon become a powerful and basic database operation of practical use. To make full use of database migration, the main memory database is considered to be one of the most significant technologies, because it allows us to perform very high speed database access which almost matches for the transmission rate of broadband networks. In this paper, we first discuss the physical database structure which realizes high speed database migration. Then, we propose the recovery methods for migratory main memory databases.
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