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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2793卷 178-221页

作者： Fiadeiro, J.L. Lopes, A. Wermelinger, M. Department of Computer Science University of Leicester University Road Leicester LE1 7RH United Kingdom Department of Informatics Faculty of Sciences University of Lisbon Campo Grande 1749-016 Lisboa Portugal Dep. of Informatics Faculty of Sciences and Technology New University of Lisbon Quinta da Torre 2829-516 Caparica Portugal

A mathematical semantics is proposed for the notion of architectural connector, in the style defined by Allen and Garlan, that builds on Goguen's categorical approach to General Systems Theory and other algebraic approaches to specification, concurrency, and parallel program design. This semantics is, essentially, ADL-indep.ndent, setting up criteria against which formalisms can be evaluated according to the support that they provide for architectural design. In particular, it clarifies the role that the separation between computation and coordination plays in supporting architecture-driven approaches to software construction and evolution. It also leads to useful generalisations of the notion of connector, namely through the use of multiple formalisms in the definition of the glue and the roles, and their instantiations with programs or system components that can be implemented in different languages or correspond to "real-world" components. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Semantics

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A mechanism for multicast multimedia data with adaptive QoS characteristics 6

引用

6th International Conference on Protocols for Multimedia Systems, PROMS 2001

作者： Bouras, Christos Gkamas, A. Computer Engineering and Informatics Dep. Univ. Of Patras PatrasGR26500 Greece Computer Technology Institute Riga Feraiou 61 PatrasGR 26221 Greece

ISBN: (纸本)9783540427087

In this paper, we describe a mechanism for adaptive transmission of multimedia data, which is based on real time protocols. The proposed mechanism can be used for multicast multimedia data over heterogeneous networks, like the Internet, and has the capability to adapt the transmission of the multimedia data to network changes. In addition, the adaptive multicast transmission mechanism uses an inter-receiver fairness function in order to treat the group of receivers with fairness in a heterogeneous environment. The proposed mechanism uses a "friendly" to the network users congestion control policy to control the transmission of the data. We evaluate the adaptive multicast transmission mechanism through a number of simulations in order to examine its fairness to the group of receivers and its behavior against TCP and UDP data streams. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Heterogeneous networks

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