| Summary: | 博士 === 國立臺灣科技大學 === 電機工程系 === 87 === This dissertation presents an object-oriented model to handle the temporal relationship for all of the multimedia objects at the presentation platform. Synchronization of the composite media objects is achieved by ensuring that all objects presented in the upcoming "manageable" period must be ready for execution. To this end, the nature of overlays is first examined for various types of objects. Critical overlaps which are crucial in synchronization are also defined. The objective of synchronization is to ensure that the media objects can be initiated precisely at the critical point of the corresponding critical overlap. The concept of manageable presentation interval is introduced and the irreducible media group is defined. Accordingly, a new model called group cascade object composition Petri-net (GCOCPN) is then proposed to facilitate partition of a presentation program of a distributed multimedia system into manageable irreducible media groups so that the multimedia information can be presented by the specific QoS requirement. The relation among buffer occupancy at the presentation platform, network bandwidth and objects pre-fetch time is also examined. Finally, a proposed resource allocation algorithm based on the upper bound of available system buffer capacity is proposed.
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