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Search Results: 1 - 10 of 3853 matches for " Alessandra Palmigiano "
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Groupoid Quantales: a non étale setting
Alessandra Palmigiano,Riccardo Re
Mathematics , 2010,
Abstract: It is well known that if G is an \'etale topological groupoid then its topology can be recovered as the sup-lattice generated by G-sets, i.e. by the images of local bisections. This topology has a natural structure of unital involutive quantale. We present the analogous construction for any non \'etale groupoid with sober unit space G_0. We associate a canonical unital involutive quantale with any inverse semigroup of G-sets which is also a sheaf over G_0. We introduce axiomatically the class of quantales so obtained, and revert the construction mentioned above by proving a representability theorem for this class of quantales, under a natural spatiality condition.
Epistemic Updates on Algebras
Alexander A Kurz,Alessandra A Palmigiano
Computer Science , 2013, DOI: 10.2168/LMCS-9(4:17)2013
Abstract: We develop the mathematical theory of epistemic updates with the tools of duality theory. We focus on the Logic of Epistemic Actions and Knowledge (EAK), introduced by Baltag-Moss- Solecki, without the common knowledge operator. We dually characterize the product update construction of EAK as a certain construction transforming the complex algebras associated with the given model into the complex algebra associated with the updated model. This dual characterization naturally generalizes to much wider classes of algebras, which include, but are not limited to, arbitrary BAOs and arbitrary modal expansions of Heyting algebras (HAOs). As an application of this dual characterization, we axiomatize the intuitionistic analogue of the logic of epistemic knowledge and actions, which we refer to as IEAK, prove soundness and completeness of IEAK w.r.t. both algebraic and relational models, and illustrate how IEAK encodes the reasoning of agents in a concrete epistemic scenario.
Dual characterizations for finite lattices via correspondence theory for monotone modal logic
Sabine Frittella,Alessandra Palmigiano,Luigi Santocanale
Computer Science , 2014,
Abstract: We establish a formal connection between algorithmic correspondence theory and certain dual characterization results for finite lattices, similar to Nation's characterization of a hierarchy of pseudovarieties of finite lattices, progressively generalizing finite distributive lattices. This formal connection is mediated through monotone modal logic. Indeed, we adapt the correspondence algorithm ALBA to the setting of monotone modal logic, and we use a certain duality-induced encoding of finite lattices as monotone neighbourhood frames to translate lattice terms into formulas in monotone modal logic.
Canonicity and Relativized Canonicity via Pseudo-Correspondence: an Application of ALBA
Willem Conradie,Alessandra Palmigiano,Sumit Sourabh,Zhiguang Zhao
Computer Science , 2015,
Abstract: We generalize Venema's result on the canonicity of the additivity of positive terms, from classical modal logic to a vast class of logics the algebraic semantics of which is given by varieties of normal distributive lattice expansions (normal DLEs), aka `distributive lattices with operators'. We provide two contrasting proofs for this result: the first is along the lines of Venema's pseudo-correspondence argument but using the insights and tools of unified correspondence theory, and in particular the algorithm ALBA; the second closer to the style of J\'onsson. Using insights gleaned from the second proof, we define a suitable enhancement of the algorithm ALBA, which we use prove the canonicity of certain syntactically defined classes of DLE-inequalities (called the meta-inductive inequalities), relative to the structures in which the formulas asserting the additivity of some given terms are valid.
Stability of Synchronization Clusters and Seizurability in Temporal Lobe Epilepsy
Agostina Palmigiano, Jesús Pastor, Rafael García de Sola, Guillermo J. Ortega
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041799
Abstract: Purpose Identification of critical areas in presurgical evaluations of patients with temporal lobe epilepsy is the most important step prior to resection. According to the “epileptic focus model”, localization of seizure onset zones is the main task to be accomplished. Nevertheless, a significant minority of epileptic patients continue to experience seizures after surgery (even when the focus is correctly located), an observation that is difficult to explain under this approach. However, if attention is shifted from a specific cortical location toward the network properties themselves, then the epileptic network model does allow us to explain unsuccessful surgical outcomes. Methods The intraoperative electrocorticography records of 20 patients with temporal lobe epilepsy were analyzed in search of interictal synchronization clusters. Synchronization was analyzed, and the stability of highly synchronized areas was quantified. Surrogate data were constructed and used to statistically validate the results. Our results show the existence of highly localized and stable synchronization areas in both the lateral and the mesial areas of the temporal lobe ipsilateral to the clinical seizures. Synchronization areas seem to play a central role in the capacity of the epileptic network to generate clinical seizures. Resection of stable synchronization areas is associated with elimination of seizures; nonresection of synchronization clusters is associated with the persistence of seizures after surgery. Discussion We suggest that synchronization clusters and their stability play a central role in the epileptic network, favoring seizure onset and propagation. We further speculate that the stability distribution of these synchronization areas would differentiate normal from pathologic cases.
Internet as a Growing and Dynamic Network: An Economic View  [PDF]
Pasquale Lucio Scandizzo, Alessandra Imperiali
Communications and Network (CN) , 2014, DOI: 10.4236/cn.2014.62009
Abstract:

The past few decades have witnessed renewed interest and research efforts on the part of the scientific community. After spending decades to disassemble nature, focusing the attention on its components, scientists have shifted their attention on complex networks. These basic structures constitute a wide range of systems in nature and society, but their design is irregular, evolves dynamically over time and their components can fit in a large multiplicity of alternative ways. Nevertheless, the most recent studies of networks have made remarkable progresses by investigating some critical issues of structure and dynamics, thereby improving the understanding of the topology and the growth processes of complex networks. From an economic point of view, networks are especially interesting because they can be considered as a problem of allocation of a critical resource, information, under multiple constraints. They can also be viewed as forms of poliarchies that reproduce, for many aspects, the market paradigm, with surprising properties of self-organization and resilience, which go much beyond the characteristics that are generally attributed to general equilibrium structures. In this paper we first address the major results achieved in the study of complex network and then focus our attention on two specific, highly dynamic and complex networks: Internet and the World Wide Web.

The Effects of Modafinil in People with a Diagnosis of Schizophrenia  [PDF]
Christopher A. Griffiths, Alessandra Girardi
Open Journal of Psychiatry (OJPsych) , 2018, DOI: 10.4236/ojpsych.2018.81008
Abstract: This review seeks to describe the use and effects of the drug modafinil. Specifically, it presents the research of the impact of modafinil for people with diagnosis and experience of schizophrenia. Recent reviews have shown that modafinil can positively impact on cognitive function in people with a diagnosis of schizophrenia. There is emerging evidence for the positive impact of modafinil on negative symptoms, functioning, quality of life, wellbeing, and body mass index (BMI) for people with schizophrenia. Compared to other central nerve stimulant (CNS) drugs, modafinil has a low risk of dependency and few negative side effects; but there are risks of triggering positive symptoms in schizophrenia. A well designed and sufficiently large randomised control trial is required to test the potential of the impact of modafinil in the lives of people with a diagnosis of schizophrenia. Future research should report participant’s perspective of the value of modafinil connected to what concerns them and what they want to achieve in their lives.
Role of health-related quality of life measures in the routine care of people with multiple sclerosis
Alessandra Solari
Health and Quality of Life Outcomes , 2005, DOI: 10.1186/1477-7525-3-16
Abstract: Reasons for lack of transfer of HRQOL measurements to clinical practice may be cultural, methodological, or practical. With regard to MS, the proliferation of instruments seems to constitute a barrier, with no particular instrument having gained wide popularity or consensus. Other barriers are lack of resources for the administration, collection and storage of the data, and inability of clinicians to score, interpret, and use HRQOL instrument to guide clinical care. It is therefore important to refine existing tools, extending clinical validation to wider contexts and cultures. More studies assessing acceptability and clinicians' and patients' preferences for different instruments are also required.Multiple sclerosis (MS) is a demyelinating disease of the central nervous system of unknown etiology and poorly understood pathogenesis. There is a north-south gradient of MS prevalence in the northern hemisphere, with highest levels (over 100 per 100,000) in northern regions [1,2]. It is a chronic disease with a modest effect on life expectancy, but a broad spectrum of consequences, of variable severity, on physical and psychological characteristics, that vary between individuals and within individuals over time. The disease typically strikes women (2:1) in their peak years of career development and family life; commonly there are exacerbations and remissions followed by progression whose rate and extent vary [3]. There is also a benign form of MS, characterised by few relapses, long periods of remission, and mild activity limitations over the long term [4]. The available treatments have at best a modest benefit on the course of the disease [5].Interest in measuring outcomes in MS has increased markedly over the past 20 years. Standardised instruments have been developed, the most-used being the Expanded Disability Status Scale (EDSS) [6] which is a mixed impairment/activity limitations scale based on neurological examination of eight functional systems, plus ambulation/
Compre o kit neoliberal para a educa??o infantil e ganhe grátis os dez passos para se tornar um professor reflexivo
ARCE, ALESSANDRA;
Educa??o & Sociedade , 2001, DOI: 10.1590/S0101-73302001000100014
Abstract: the objective of this article is to contribute at the present time for the reflection about the teacher's infant education formation. therefore, it is done a revision of the bibliography that has been alerting for the interfaces of the neo-liberalism and the post-modernism with the educational politics and, especially, the politics of teacher's formation. the documents produced by mec, as guiding for the implementation of the neo-liberal ideal in the field of the teacher's infant education formation, are analyzed, as references as for the teacher's formation as to define knowledge to be worked in the education from 0 to 6. at the end, we conclude that the tendencies of this process are the haste the teacher's formation, the gradual loss of control of the same ones on its professional exercise and the transformation of the classrooms of infant education in labs of implementation of the pedagogic ideals intimated to the neo-liberalism and the post-modernism.
A teoria da aprendizagem experiencial como alicerce de estudos sobre desenvolvimento profissional
Pimentel, Alessandra;
Estudos de Psicologia (Natal) , 2007, DOI: 10.1590/S1413-294X2007000200008
Abstract: the theory of the experiential learning consists of a perspective about the development of the adult, in special, of the professional. according to its founder, the american david kolb, the profissionality is a permanent process of learning, provided the individual can assume appropriate the experiences of professional performance. the principles and basic concepts of this approach are presented, based on the relation between certain types of learning and the development of the affectivity, perception, cognition and behavior belonging to the professional life track or in specific situations as it is the case of projects of formation in service. the holistic and integrative perspective of the experiential learning has some proximity with contemporary approaches which emphasize the role of the reflective thought for improvement of the professional qualification. however, kolb?s theory follows a proper and original way, with great potential for studies and formative proposals for the professional development.
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