Elastic time computation in QoS-driven hypermedia presentations |
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Authors: | Bruno Bachelet Philippe Mahey Rogério Rodrigues Luiz Fernando Soares |
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Affiliation: | 1.LIMOS, CNRS, ISIMA Université Blaise Pascal,Clermont-Ferrendcedex1,France;2.Departamento de Informática,PUC-Rio,Rio de Janeiro,Brazil |
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Abstract: | The development of hypermedia/multimedia systems requires the implementation of an element, usually known as formatter, which
is in charge of receiving the specification of a document and controlling its presentation. Adjustments over the duration
of media objects is one of the most important adaptation techniques that hypermedia formatters should implement in order to
maintain document spatio-temporal relationships. Elastic time computation accomplishes this goal by stretching or shrinking
the ideal duration of media objects. This paper presents new elastic time algorithms for adjusting hypermedia document presentations.
The algorithms explore the flexibility offered by some hypermedia models in the definition of media-object durations, choosing
objects to be stretched or shrunk in order to obtain the best possible quality of presentation. Our proposals are based on
the “out-of-kilter” method for minimum-cost flow problems on temporal graphs. An aggregation procedure enhances the basic
algorithm offering more flexibility in modeling real-life situations in comparison with other previous work based on linear
programming. |
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