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We consider the problem of OS resource management for real-time and multimedia systems where multiple activities with different timing constraints must be scheduled concurrently. Time on a particular resource is shared among its users and must be globally managed in real-time and mul-timedia systems. A resource kernel is meant for use in such systems and is(More)
In this paper, we propose a scheme of rate control for continuous UDP ow with moderate fairness. First, per-packet Relative One-way Trip Time (ROTT) of a UDP stream at a receiver on the Internet is investigated extensively, and it is found that spikes with successive plots, which we call spike-trains, often appear on a time-ROTT graph. Also,(More)
Traditional real-time systems have largely avoided the use of disks due to their relative slow speeds and their un-predictability. However, many real-time applications including multimedia systems and real-time database applications benefit significantly from the use of disks to store and access real-time data. In this paper, we investigate the problem of(More)
The world today is characterised by the proliferation of information sources available through media such as the WWW, databases, semi-structured files (e.g. XML documents), etc. Nevertheless, this information is usually scattered, heterogeneous and weakly structured, so it is difficult to process it automatically. DENODO Corporation has developed a mediator(More)
We discuss how methods from social network analysis could be combined with methodologies from database mediator technology and information fusion in order to give police and other civil security decision-makers the ability to achieve predictive situation awareness. Techniques based on these ideas have been demonstrated in the EU PASR project HiTS/ISAC.
Mediator systems aim to provide an unified global data schema over distributed heterogeneous structured and semi-structured data sources. These systems must deal with limitations on the query capabilities of the sources. This paper introduces a new framework for representing source query capability along with the algorithms needed to compute the query(More)