5,837 research outputs found

    Towards engineering ontologies for cognitive profiling of agents on the semantic web

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    Research shows that most agent-based collaborations suffer from lack of flexibility. This is due to the fact that most agent-based applications assume pre-defined knowledge of agents’ capabilities and/or neglect basic cognitive and interactional requirements in multi-agent collaboration. The highlight of this paper is that it brings cognitive models (inspired from cognitive sciences and HCI) proposing architectural and knowledge-based requirements for agents to structure ontological models for cognitive profiling in order to increase cognitive awareness between themselves, which in turn promotes flexibility, reusability and predictability of agent behavior; thus contributing towards minimizing cognitive overload incurred on humans. The semantic web is used as an action mediating space, where shared knowledge base in the form of ontological models provides affordances for improving cognitive awareness

    Riesz Transforms and Spectral Multipliers of the Hodge-Laguerre Operator

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    On R+d\mathbb{R}^d_+, endowed with the Laguerre probability measure Όα\mu_\alpha, we define a Hodge-Laguerre operator Lα=ήή∗+ή∗ή\mathbb{L}_\alpha=\delta\delta^*+\delta^* \delta acting on differential forms. Here ÎŽ\delta is the Laguerre exterior differentiation operator, defined as the classical exterior differential, except that the partial derivatives ∂xi\partial_{x_i} are replaced by the "Laguerre derivatives" xi∂xi\sqrt{x_i}\partial_{x_i}, and ή∗\delta^* is the adjoint of ÎŽ\delta with respect to inner product on forms defined by the Euclidean structure and the Laguerre measure Όα\mu_\alpha. We prove dimension-free bounds on LpL^p, 1<p<∞1<p<\infty, for the Riesz transforms ÎŽLα−1/2\delta \mathbb{L}_\alpha^{-1/2} and ή∗Lα−1/2\delta^* \mathbb{L}_ \alpha^{-1/2}. As applications we prove the strong Hodge-de Rahm-Kodaira decomposition for forms in LpL^p and deduce existence and regularity results for the solutions of the Hodge and de Rham equations in LpL^p. We also prove that for suitable functions mm the operator m(Lα)m(\mathbb{L}^\alpha) is bounded on LpL^p, 1<p<∞1<p<\infty.Comment: 49 page

    The biting and predaceous midges of Guadeloupe (Diptera: Ceratopogonidae). I. Species of the subfamily Ceratopogoninae

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    We provide new records of biting and predaceous midges (Diptera: Ceratopogonidae) from Guadeloupe in the subfamily Ceratopogoninae, including descriptions and illustrations of three new predaceous species in the genera, Parabezzia Malloch, Stilobezzia Kieffer and Palpomyia Meigen, respectively, and the first records of the New World predaceous genus, Amerohelea Grogan and Wirth, from the Caribbean region. We also provide the first Guadeloupe records of the biting midges, Culicoides (Anilomyia) decor (Williston), C. (Avaritia) pusillus Lutz, C. (Drymodesmyia) bredini Wirth and Blanton, C. (D.) poikilonotus Macfie, C. (Haematomyidium) hoffmani Fox, C. (Hoffmania) insignis Lutz, C. rangeli Ortiz and Mirsa and C. trilineatus Fox, and the predaceous midges, Brachypogon (Brachypogon) bifidus Spinelli and Grogan, B. (B.) telesfordi Spinelli and Grogan, B. (B.) woodruffi Spinelli and Grogan, Monohelea maya Felippe-Bauer, Huerta and Ibåñez-Bernal, Stilobezzia (Stilobezzia) diminuta Lane and Forattini, S. (S.) thomsenae Wirth, Amerohelea galindoi Grogan and Wirth, Bezzia (Bezzia) flinti Spinelli and Wirth, B. (Homobezzia) venustula (Williston) and Palpomyia insularis Spinelli and Grogan

    Environmental epigenetics in zebrafish

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    It is widely accepted that the epigenome can act as the link between environmental cues, both external and internal, to the organism and phenotype by converting the environmental stimuli to phenotypic responses through changes in gene transcription outcomes. Environmental stress endured by individual organisms can also enforce epigenetic variations in offspring that had never experienced it directly, which is termed transgenerational inheritance. To date, research in the environmental epigenetics discipline has used a wide range of both model and non-model organisms to elucidate the various epigenetic mechanisms underlying the adaptive response to environmental stimuli. In this review, we discuss the advantages of the zebrafish model for studying how environmental toxicant exposures affect the regulation of epigenetic processes, especially DNA methylation, which is the best-studied epigenetic mechanism. We include several very recent studies describing the state-of-the-art knowledge on this topic in zebrafish, together with key concepts in the function of DNA methylation during vertebrate embryogenesis

    The Eurocrats

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