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Semantic Web Services (SWSs) promise to provide solutions to the challenges associated with automated discovery, dynamic composition , enactment, and other tasks associated with managing and using service-based systems. One of the barriers to a wider adoption of SWS technology is the lack of tools for creating SWS specifications. OWLS is one of the major(More)
— We present Cognitive Radio (Policy) Language (CoRaL), a new language for expressing policies that govern the behavior of cognitive radios that oppor-tunistically share spectrum. A Policy Reasoner validates radio transmissions to ensure that they are compliant with the spectrum policies. The Policy Reasoner also discovers spectrum sharing opportunities by(More)
— We argue for a policy-based approach to increase spectrum availability. To this extend, we briefly summarize a new language for expressing policies that allow opportunistic spectrum access. A Policy Reasoner that reasons about these policies has can be used with cog-nitive radios to guarantee policy-specified behaviors while allowing spectrum sharing. We(More)
An experimental offline investigation of the performance of connected digits recognition was performed on children in the age range four to eight years. Poor performance using adult models was improved significantly by adaptation and vocal tract length normalisation but not to the same level as training on children. Age dependent models were tried with(More)
Military training and testing events are highly complex affairs , potentially involving dozens of legacy systems that need to inter-operate in a meaningful way. There are superficial interoperability concerns (such as two systems not sharing the same messaging formats), but also substantive problems such as different systems not sharing the same(More)
We present a new language for expressing policies that allow opportunistic spectrum access while not causing interference. CoRaL has expressive constructs for numerical constraints, supports efficient reasoning, and will be verifiable. The language is extensible so that unanticipated policy types can be encoded. We also describe a Policy Reasoner that(More)
This paper reports on the recording and planned research activities on recognition of children's speech in the EU-project PF-Star. The task is quite more difficult than recognition of adult speech for several reasons. High fundamental frequency and formant frequencies change the spectral shape of the speech signal. Also the pronunciation and the use of(More)
We describe a novel approach by which software can assess the ability of a confederation of heterogeneous systems to interoperate to achieve a given purpose. The approach uses ontologies and knowledge bases (KBs) to capture the salient characteristics of systems, on the one hand, and of tasks for which these systems will be employed, on the other. Rules are(More)