924 resultados para Belief Propagation
Resumo:
I argue (1) that Alvin Plantinga’s theory of warrant is plausible and (2) that, contrary to the Pandora’s Box objection, there are certain serious world religions that cannot successfully use Plantinga’s epistemology to demonstrate that their beliefs could be warranted in the same way that Christian belief can be warranted. In arguing for (1), I deploy Ernest Sosa’s Swampman case to show that Plantinga’s proper function condition is a necessary condition for warrant. I then engage three objections to Plantinga’s theory of warrant, each of which attempts to demonstrate that his conditions for warrant are neither necessary nor sufficient. Having defended the plausibility of Plantinga’s theory of warrant, I present and expand his key arguments to the effect that naturalism cannot make use of it. These arguments provide the conceptual tools that are needed to argue for (2): that there are certain world religions that cannot legitimately use Plantinga’s theory of warrant to demonstrate that their beliefs could be warranted in the same way that Christian belief can be warranted.
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Various environmental management systems, standards and tools are being created to assist companies to become more environmental friendly. However, not all the enterprises have adopted environmental policies in the same scale and range. Additionally, there is no existing guide to help them determine their level of environmental responsibility and subsequently, provide support to enable them to move forward towards environmental responsibility excellence. This research proposes the use of a Belief Rule-Based approach to assess an enterprise’s level commitment to environmental issues. The Environmental Responsibility BRB assessment system has been developed for this research. Participating companies will have to complete a structured questionnaire. An automated analysis of their responses (using the Belief Rule-Based approach) will determine their environmental responsibility level. This is followed by a recommendation on how to progress to the next level. The recommended best practices will help promote understanding, increase awareness, and make the organization greener. BRB systems consist of two parts: Knowledge Base and Inference Engine. The knowledge base in this research is constructed after an in-depth literature review, critical analyses of existing environmental performance assessment models and primarily guided by the EU Draft Background Report on "Best Environmental Management Practice in the Telecommunications and ICT Services Sector". The reasoning algorithm of a selected Drools JBoss BRB inference engine is forward chaining, where an inference starts iteratively searching for a pattern-match of the input and if-then clause. However, the forward chaining mechanism is not equipped with uncertainty handling. Therefore, a decision is made to deploy an evidential reasoning and forward chaining with a hybrid knowledge representation inference scheme to accommodate imprecision, ambiguity and fuzzy types of uncertainties. It is believed that such a system generates well balanced, sensible and Green ICT readiness adapted results, to help enterprises focus on making improvements on more sustainable business operations.
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Perspective taking is a crucial ability that guides our social interactions. In this study, we show how the specific patterns of errors of brain-damaged patients in perspective taking tasks can help us further understand the factors contributing to perspective taking abilities. Previous work (e.g., Samson, Apperly, Chiavarino, & Humphreys, 2004; Samson, Apperly, Kathirgamanathan, & Humphreys, 2005) distinguished two components of perspective taking: the ability to inhibit our own perspective and the ability to infer someone else’s perspective. We assessed these components using a new nonverbal false belief task which provided different response options to detect three types of response strategies that participants might be using: a complete and spared belief reasoning strategy, a reality-based response selection strategy in which participants respond from their own perspective, and a simplified mentalising strategy in which participants avoid responding from their own perspective but rely on inaccurate cues to infer the other person’s belief. One patient, with a self-perspective inhibition deficit, almost always used the reality-based response strategy; in contrast, the other patient, with a deficit in taking other perspectives, tended to use the simplified mentalising strategy without necessarily transposing her own perspective. We discuss the extent to which the pattern of performance of both patients could relate to their executive function deficit and how it can inform us on the cognitive and neural components involved in belief reasoning.
Resumo:
Dans la maladie d’Alzheimer, il existe deux marqueurs histopathologiques : les plaques amyloïdes composées de la protéine amyloïde-bêta et les enchevêtrements neurofibrillaires (NFTs) composés de la protéine tau agrégée. Dans le cerveau, la propagation de la pathologie de tau est observée le long des circuits neuronaux connectés synaptiquement, selon une séquence de stades, caractérisés par le Docteur Braak en 1991. Chez les patients, le degré de démence corrèle avec le nombre de NFTs. Ces derniers apparaissent dans des régions précises du cerveau et se propagent, de manière prédictible, le long des projections neuronales à des stades plus tardifs de la pathologie. Il reste à éclaircir la manière dont les NFTs se propagent dans les différentes régions du cerveau. Dans notre laboratoire, nous avons émis l’hypothèse que la propagation de tau pourrait se produire par un processus de transmission de cellule à cellule. Ainsi, la protéine tau serait tout d’abord sécrétée par un neurone, puis endocytée par un neurone adjacent. Nos travaux de recherche se sont concentrés sur la sécrétion de la protéine tau. Dans une première étape, nous avons démontré l’existence de la sécrétion active de tau dans l’espace extracellulaire, en utilisant des modèles in vitro de cellules non neuronales et neuronales. Par la suite, nous avons caractérisé les formes de protéines tau sécrétées. Enfin dans un dernier temps, nous avons exploré les voies de sécrétion de la protéine tau ainsi que les mécanismes régulant ce phénomène. Nous avons réussi à moduler la sécrétion de tau en reproduisant plusieurs insultes observées dans la maladie d’Alzheimer. Nos recherches nous ont permis d’identifier l’appareil de Golgi comme étant une organelle dont la fragmentation augmente la sécrétion de la protéine tau. A la lumière de cette découverte, nous avons été capable de moduler la sécrétion de tau en ciblant spécifiquement l’activité de cdk5 et l’expression de rab1A contrôlant la morphologie du Golgi. Ainsi, nous avons réussi à diminuer significativement la sécrétion de la protéine tau. Nos travaux de recherche proposent de nouvelles cibles thérapeutiques pour la maladie d’Alzheimer, visant à diminuer la propagation de la pathologie de tau par de nouveaux mécanismes cellulaires.
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The goal of this study is to provide a framework for future researchers to understand and use the FARSITE wildfire-forecasting model with data assimilation. Current wildfire models lack the ability to provide accurate prediction of fire front position faster than real-time. When FARSITE is coupled with a recursive ensemble filter, the data assimilation forecast method improves. The scope includes an explanation of the standalone FARSITE application, technical details on FARSITE integration with a parallel program coupler called OpenPALM, and a model demonstration of the FARSITE-Ensemble Kalman Filter software using the FireFlux I experiment by Craig Clements. The results show that the fire front forecast is improved with the proposed data-driven methodology than with the standalone FARSITE model.
Resumo:
Dados suplementares associados com o artigo e epígrafe estão disponíveis em: http://dx.doi.org/10.1016/j.cogdev.2016.08.007
Resumo:
Background: Sertoli cells play a pivotal role in creating microenvironments essential for spermatogonial stem cells (SSCs) self-renewal and commitment to differentiation. Maintenance of SSCs and or induction of in vitro spermiogenesis may provide a therapeutic strategy to treat male infertility. Objective: This study investigated the role of luekemia inhibitory factor (LIF) on the propagation of SSCs and both functions of Sertoli cells on the proliferation and differentiation of these cells. Materials and Methods: SSCs were sorted from the testes of adult male mice by magnetic activated cell sorting and thymus cell antigen 1 antibody. On the other hand, isolated Sertoli cells were enriched using lectin coated plates. SSCs were cultured on Sertoli cells for 7 days in the absence or presence of LIF. The effects of these conditions were evaluated by microscopy and expression of meiotic and post meiotic transcripts by reverse transcriptase polymerase chain reaction. Results: Our data showed that SSCs co-cultured with Sertoli cells in the presence of LIF formed colonies on top of the Sertoli cells. These colonies had alkaline phosphatesase activity and expressed SSCs specific genes. SSCs were enjoyed limited development after the mere removal of LIF, and exhibiting expression of meiotic and postmeiotic transcript and loss of SSCs specific gene expression (p< 0.05). Conclusion: Our findings represent co-culture of SSCs with Sertoli cells provides conditions that may allow efficient proliferation and differentiation of SSCs for male infertility treatment.
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Purpose: To assess the compliance of Daily Disposable Contact Lenses (DDCLs) wearers with replacing lenses at a manufacturer-recommended replacement frequency. To evaluate the ability of two different Health Behavioural Theories (HBT), The Health Belief Model (HBM) and The Theory of Planned Behaviour (TPB), in predicting compliance. Method: A multi-centre survey was conducted using a questionnaire completed anonymously by contact lens wearers during the purchase of DDCLs. Results: Three hundred and fifty-four questionnaires were returned. The survey comprised 58.5% females and 41.5% males (mean age 34. ±. 12. years). Twenty-three percent of respondents were non-compliant with manufacturer-recommended replacement frequency (re-using DDCLs at least once). The main reason for re-using DDCLs was "to save money" (35%). Predictions of compliance behaviour (past behaviour or future intentions) on the basis of the two HBT was investigated through logistic regression analysis: both TPB factors (subjective norms and perceived behavioural control) were significant (p. <. 0.01); HBM was less predictive with only the severity (past behaviour and future intentions) and perceived benefit (only for past behaviour) as significant factors (p. <. 0.05). Conclusions: Non-compliance with DDCLs replacement is widespread, affecting 1 out of 4 Italian wearers. Results from the TPB model show that the involvement of persons socially close to the wearers (subjective norms) and the improvement of the procedure of behavioural control of daily replacement (behavioural control) are of paramount importance in improving compliance. With reference to the HBM, it is important to warn DDCLs wearers of the severity of a contact-lens-related eye infection, and to underline the possibility of its prevention.
Resumo:
An important parameter in integrated optical device is the propagation loss of the waveguide. Its characterization gives the information of the fabrication quality as well as the information of other passive devices on the chip as it is the basic building block of the passive devices. Although, over the last three decades many methods have been developed, there is not a single standard present yet. This paper presents a comparative analysis of the methods existing from the past as well as methods developed very recently in order to provide a complete picture of the pros and cons of different types of methods and from this comparison the best method is suggested according to the authors opinion. To support the claim, apart from the analytical comparison, this paper also presents a comparison performed with the experimental results between the suggested best method which is recently proposed by Massachusetts Institute of Technology (MIT) researchers based on undercoupled all-pass microring structure and the popular cut-back method.
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The present paper explores the role of motivation to observe a certain outcome in people's predictions, causal attributions, and beliefs about a streak of binary outcomes (basketball scoring shots). In two studies we found that positive streaks (points scored by the participants' favourite team) lead participants to predict the streak's continuation (belief in the hot hand), but negative streaks lead to predictions of its end (gambler's fallacy). More importantly, these wishful predictions are supported by strategic attributions and beliefs about how and why a streak might unfold. Results suggest that the effect of motivation on predictions is mediated by a serial path via causal attributions to the teams at play and belief in the hot hand.
Resumo:
C’est en réponse aux plus récentes crises financières que plusieurs processus réglementaires – dont certains constituent les objets d’étude de cette thèse – ont été déployés pour concevoir et implanter diverses réformes « d’amélioration » au sein de la pratique professionnelle des auditeurs financiers. Tant la crise du début des années 2000 que celle de 2007-2008 auraient attiré de vives critiques à l’égard du travail des auditeurs et de leur contribution (prétendument défaillante) au sein du fonctionnement des marchés des capitaux. Considérant leur fonction de « chien de garde » qui est censée assurer, avant tout, la protection du public au sein de ces marchés, il semblait inévitable que leur travail soit, dans une certaine mesure, remis en doute à travers les processus de révision réglementaire mis en place. C’est ainsi que chacun des trois articles qui composent cette thèse offre une analyse de différents aspects – tels que la mise en place, le déroulement, la nature et la substance des discours et des résultats – liés à ces processus de révision réglementaire qui entourent la pratique professionnelle des auditeurs au lendemain des crises financières. En somme, en plus d’indiquer comment ces processus ne sont point à l’abri de controverses, les conclusions de cette thèse inciteront à ce qu’une attention sérieuse soit portée à leur égard afin de préserver le bienfondé de la profession des comptables et des auditeurs. Alors que, dans le premier article, il sera question d’illustrer l’infiltration (critiquable) d’un discours néolibéral au sein des débats qui entourent les processus de révision réglementaire dont il est question, dans le deuxième article, il sera question d’exposer, au sein de ces processus, un mécanisme de production de mythes prônant un certain statu quo. Par ailleurs, dans le dernier article, en plus de mettre en évidence le fait que les approches de gouvernance déployées à travers ces processus de révision réglementaire ne sont pas suffisamment englobantes, on pourra aussi prendre conscience de l’inféodation de l’expertise de l’audit face à son environnement (et plus précisément, face aux expertises de la normalisation comptable et de la financiarisation de l’économie). Sous un regard critique, et à travers des analyses qualitatives, chacun des articles de cette thèse permettra de remettre en question certaines facettes des processus réglementaires et institutionnels qui entourent le champ de la comptabilité et de l’audit.