Nada Abdallah

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Dans un système d’inférence pair-à-pair (P2PIS), un pair étend sa base de connaissances (KB) avec celle des autres pairs afin d’utiliser leurs connaissances pour répondre aux requêtes qui lui sont posées. Toutefois, l’extension d’une KB n’est pas nécessairement conservative. Une extension conservative garantit que le sens d’une KB est le même lorsqu’elle(More)
This paper provides a decentralized data model and associated algorithms for peer data management systems (PDMS) based on the DL-LITER description logic. Our approach relies on reducing query reformulation and consistency checking for DL-LITER into reasoning in propositional logic. This enables a straightforward deployment of DLLITER PDMSs on top of(More)
Cet article montre en quoi la notion d’extension non conservative d’une base de connaissances (KB) est importante dans les sytèmes d’inférence pair-àpair (P2PIS), aussi connus sous le nom de systèmes pair-à-pair sémantiques. Cette notion est utile à un pair afin de détecter si (une partie de) sa KB est corrompue par un P2PIS ou pour apprendre du P2PIS de(More)
This paper provides a decentralized data model and associated algorithms for peer data management systems (PDMSs) based on the DL-LITER description logic. That logic is a fragment of the forthcoming W3C recommendation for the Semantic Web : OWL2. Our approach relies on reducing query reformulation and consistency checking for DL-LITER into reasoning in(More)
In this paper, we study consequence finding in propositional peer-to-peer inference systems (P2PISs) with directed mappings. In those systems, a mapping from a peer to another specifies some knowledge that the former peer has to observe and the knowledge it must notify to the latter peer if the observed knowledge is satisfied. Such new P2PISs can model many(More)
Deltamethrin one of the insecticides recommended by the Wold Health Organization for agriculture spraying e.g.vegetables . Although deltamethrin appears to be the most persistent pyrethroid in commercial use and in field studies because this insecticide degrades faster than many of the persistent organochlorides . This study was designed to understand the(More)
INTRODUCTION The number of persons aged >90 years will grow significantly in coming decades. This group has the highest rates of dementia, most commonly Alzheimer's disease (AD). METHODS Using The 90+ Study, we developed a statistical model for dementia risk based on brain pathologies. Intervention scenarios which reduce or eliminate AD pathology were(More)
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