Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2017-01-30T18:17:26Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) DISSERTACAO_LEO_DEFESA - FINAL - CATALOGADA PDF.pdf: 4585329 bytes, checksum: 4b70c80127866cd2da97a6217bb6a34f (MD5) / Made available in DSpace on 2017-01-30T18:17:27Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) DISSERTACAO_LEO_DEFESA - FINAL - CATALOGADA PDF.pdf: 4585329 bytes, checksum: 4b70c80127866cd2da97a6217bb6a34f (MD5) Previous issue date: 2016-08-16 / CNPQ / Um dos principais desafios no projeto de sensores baseados em Ressonância de Plasmons de Superfície — RPS — é maximizar sua sensibilidade. Neste trabalho é proposto o uso de dois algoritmos heurísticos, Monte Carlo e Enxame de Partículas, para otimização de sensores baseados em RPS em interfaces planares, i.e, nas configurações de Kretschmann e de Otto, sem o auxílio da aproximação lorentziana para a curva de ressonância. Devido à natureza probabilística dos algoritmos, consegue-se obter um método simples e robusto para atingir essa otimização. É feita uma comparação quanto à eficiência computacional dos algoritmos em relação ao método tradicional de otimização, ficando demonstrado que o método de Enxame de Partículas é o mais eficiente em relação às outras técnicas. Com o emprego desse método, a dependência espectral dos parâmetros ótimos é obtida para sensores utilizando vários metais nas configurações de Kretschmann e de Otto, tanto para aplicações em meios gasosos quanto em meios aquosos. Um aplicativo foi desenvolvido e sua funcionalidade demonstrada, que pode ser executado diretamente via web, com base na metodologia proposta, para otimização de sensores RPS em interfaces planares. / One of the main challenges in the design of surface plasmon resonance – SPR – sensor systems is to maximize their sensitivity. In this work one proposes the use of two heuristic algorithms, Monte Carlo and Particle Swarm, for optimization of SPR sensors in planar interfaces, i.e, in the Kretschmann and Otto configurations, without use of the Lorentzian approximation to the resonance curve. Because of the probabilistic nature of the algorithms, one manages to obtain a simple and robust method to achieve optimization. A comparison is made on the computational efficiency of the algorithm relative to the traditional method of optimization, showing that the particle swarm optimization method is more efficient compared to other techniques. By employing this method, the spectral dependence of optimum parameters is obtained for sensors using a wide range of metal films in the Kretschmann and Otto configurations, both for applications in gaseous an in aqueous media. An app was developed and its functionality can be demonstrated, by direct execution via web, based on the proposed methodology for optimization of SPR sensors on planar interfaces.

Speech signal is being used in the meaning of nonlinear dynamic system. As such, it is transform to multidimensional phase space, where filtration method based on time series neighbors of analysed signal is used. For embedding phase space methods time delay and false nearest neighbors are applied.

Dans un contexte d’intensification du travail, sont apparus au-devant de la scène les risques psychosociaux (RPS). Au fil des années, la prévention des RPS et la qualité de vie au travail sont devenus des enjeux de santé publique, et les entreprises privées et publiques s’y intéressent plus que jamais. La littérature nous avait permis d’identifier, au-delà des facteurs de RPS tels que les caractéristiques des postes, la justice organisationnelle comme un prédicteur de santé au travail (Elovainio et al., 2003 ; Robbins et al., 2012). Notre première étude avait pour objectif de mieux comprendre les mécanismes par lesquels les dimensions de justice exercent un effet sur les variables de bien-être et de retrait. Nos résultats ont révélé à ce sujet que les perceptions de justice jouent un rôle médiateur dans la relation entre les caractéristiques des postes et les variables de bien-être telle que la satisfaction, l’attachement, l’épuisement émotionnel et les intentions de retrait, même si la médiation est partielle la plupart du temps. En effet, certaines caractéristiques des postes comme le soutien du supérieur continuent à maintenir un rôle prédictif et direct important, plaçant le supérieur au cœur du dispositif de prévention. Notre seconde étude a porté sur l’introduction des principes de justice au cœur d’une formation aux RPS pour les cadres d’un hôpital. L’évaluation des effets de cette action sur le sentiment de justice des personnels a montré l’utilité de former les supérieurs à la justice. Ainsi, nous avons pu élargir les possibilités d’actions sur le terrain pour prévenir les RPS en rendant incontournables les principes de la justice dans la conception du travail. / In the context of intensification of work, psychosocial risks (PSR) have attracted great interest. Over the past few years, PSR prevention and the quality of worklife have become public health issues, and have more than ever drawn both private and public companies' attention. Beyond PSR factors such as job characteristics, the literature helped us identify organizational justice as a predictor of occupational health (Elovainio et al., 2003; Robbins et al., 2012). Our first study’s goal was to gain a better understanding of the mechanisms with which justice dimensions affect well-being and withdrawal variables. Our results revealed that justice perceptions act as a mediator in the relationship between job characteristics and well-being variables such as satisfaction, commitment, burnout (or emotional exhaustion), and withdrawal intentions, even if most of the time the mediation is partial. Indeed, some job characteristics, such as supervisory support maintain an important and direct predictive role, putting management at the center of the prevention system. Our second study focused on the introduction of organizational justice principles at the core of a PSR training course for executive staff in a hospital. Evaluating the effects of this action on the personnel's feelings of justice showed the utility of training the Executive staff in justice principles. Thus, we have been able to extend the scope of PSR prevention in the field by showing the pivotal role the principles of justice play in work design.

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Power flow (PF) control can increase the utilization of the transmission system and connect lower cost generation with load. While PF controllers have demonstrated the ability to realize dynamic PF control for more than 25 years, PF control has been sparsely implemented. This research re-examines PF control in light of the recent development of fractionally-rated PF controllers and the incremental power flow (IPF) control concept. IPF control is the transfer of an incremental quantity of power from a specified source bus to specified destination bus along a specified path without influencing power flows on circuits outside of the path. The objectives of the research are to develop power system operation and planning methods compatible with IPF control, test the technical viability of IPF control, develop transmission planning frameworks leveraging PF and IPF control, develop power system operation and planning tools compatible with PF control, and quantify the impacts of PF and IPF control on multi-decade transmission planning. The results suggest that planning and operation of the power system are feasible with PF controllers and may lead to cost savings. The proposed planning frameworks may incent transmission investment and be compatible with the existing transmission planning process. If the results of the planning tool demonstration scale to the national level, the annual savings in electricity expenditures would be $13 billion per year (2010$). The proposed incremental packetized energy concept may facilitate a reduction in the environmental impact of energy consumption and lead to additional cost savings.