Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-06-28T17:35:43Z No. of bitstreams: 1 2015 - Yusim? P?rez Lop?z.pdf: 5822047 bytes, checksum: 793648c4521da174315eeed1e9bc79dc (MD5) / Made available in DSpace on 2017-06-28T17:35:43Z (GMT). No. of bitstreams: 1 2015 - Yusim? P?rez Lop?z.pdf: 5822047 bytes, checksum: 793648c4521da174315eeed1e9bc79dc (MD5) Previous issue date: 2015-08-27 / CAPES / Monitoring of potentially contaminated areas, it is necessary the knowledge of the natural levels of heavy metals and variability factors in soils. The proposition reference value for heavy metals is essential to establish criteria for sustainable use and management, preventing risks to the environment and human health. In this context, the objectives of this research were to determine the quality reference values of heavy metals to soils representative of Artemisa and Mayabeque provinces; evaluating, by sequential extraction, the potential under natural conditions, bioavailability and mobility of heavy metals (Cu, Pb, Cr, Cd, Zn, Ni, Fe and Mn), and study the variability factors of these elements in the grazing areas in Alturas Nazareno-Mayabeque region. For the establishment of reference values, we selected 11 soil types, with minimal human disturbance, and collected soil samples from depths of 0-20 and 20-40 cm. In Alturas de Nazareno area soil samples were collected and representative plant in 45 points of grazing areas. To determine the contents pseudototais was used extraction with aqua regia according to ISO 11466 and ISO / DIS 12914 (2012). The geochemical fractionation was carried out by BCR (Community Bureau of Reference) evaluating the distribution of metals in four chemical fractions. Plants in metal contents were obtained by digestion seconds EPA 3052. Later, the data were analyzed by multivariate procedures: principal component analysis (PCA); cluster analysis and discriminant. For the representative soils of the provinces of Mayabeque and Artemisa the results indicated elevated associations between the levels of pseudototais metals (Ni, Cr, Mn, Cu and Zn) and bioavailable with Fe, H+Al, clay and pH. The samples were separated in four groups to better express the variability. Group 1 was characterized by lower concentrations of Ni and Cr and intermediate Cu, Zn, Pb and Cd. The group 2 showed intermediate values of Ni, Cr, Cu and Zn and lower Pb and Cd. Group 3 showed the highest levels of Cu, Zn, Pb and Cd and intermediate Ni and Cr and the group 4 showed very high contents of Ni and Cr and minor Cu, Zn, Pb and Cd. The heavy metals Cu, Pb, Cr, Cd, Zn, Ni, Fe and Mn in 11 soil types, had a strong association with the residual fraction (F4), mainly in soils with high levels of Fe. There was a low association with the fractions more labile F1 and F2 demonstrating lithogenic origin of these. Chemical attributes that most influence the speciation of metals in representative soils were: pH, Ca, Fe, Mn, H + Al and Mg. To study the variability factors in Nazareth height region, high correlations were observed between metals and especially with Fe and clay. The separation into two groups allowed for distribution within the most homogeneous groups, with Group 2 the highest risk. The Sporobollus indicus species (L) was a good indicator to study the transfer of heavy metals in plants. / No monitoramento de ?reas potencialmente contaminadas, faz-se necess?rio o conhecimento dos teores naturais de metais pesados e dos fatores de variabilidade em solos. A proposi??o de valores de refer?ncia para metais pesados ? fundamental para estabelecer crit?rios de uso e manejo sustent?vel, prevenindo riscos ao meio ambiente e ? sa?de humana. Neste contexto, os objetivos desta pesquisa foram: determinaros valores de refer?ncia de qualidade de metais pesados para solos representativos das prov?ncias Mayabeque e Artemisa; avaliar, mediante extra??o sequencial, o potencial, em condi??es naturais, de biodisponibilidade e mobilidade de metais pesados (Cu, Pb, Cr, Cd, Zn, Ni, Fe e Mn), e estudar os fatores de variabilidade desses elementos nas ?reas de pastagem na regi?o de Alturas de Nazareno-Mayabeque. Para o estabelecimento dos valores de refer?ncia, foram selecionados 11 tipos de solos, com m?nima perturba??o antr?pica, e coletadas amostras de terra nas profundidades 0-20 e 20-40 cm. Na regi?o de Alturas de Nazareno foram coletadas amostras de solo e planta representativas em 45 pontos de ?reas de pastagem. Para a determina??o dos teores pseudototaisfoi utilizada a extra??o com ?gua r?gia, conforme a ISO 11466 e a Norma ISO/DIS 12914, (2012). Ofracionamento geoqu?mico foi realizado pelo m?todo BCR (Community Bureau of Reference) avaliando-se a distribui??o de metais em quatro fra??es qu?micas. Os teores de metais em plantas foram obtidos atrav?s de digest?o segundo EPA 3052. Posteriormente, os dados foram tratados por procedimentos multivariados: an?lises de componentes principais (ACP); an?lise de agrupamento, e discriminante. Para os solos representativos das prov?ncias de Mayabeque e Artemisa os resultados indicaram associa??es elevadas entre os teores de metais pseudototais (Ni, Cr, Mn, Cu e Zn) e biodispon?veis com os teores de Fe, H+Al, argila e pH. As amostras foram separadas em quatro grupos para expressar melhor a variabilidade. O grupo 1, foi caracterizado pelas menores concentra??es de Ni e Cr e intermedi?rias de Cu, Zn, Pb e Cd. O grupo 2, apresentava valores intermedi?rios de Ni, Cr, Cu e Zn e menores de Pb e Cd. O grupo 3 mostrou os teores mais elevados de Cu, Zn, Pb e Cd e intermedi?rios de Ni e Cr e o grupo 4 apresentouconte?dos muito elevados de Ni e Cr e os menores teores de Cu, Zn, Pb e Cd. Os metais pesados Cu, Pb, Cr, Cd, Zn, Ni, Fe e Mn, nos 11 tipos de solos, tiveram uma elevada associa??o com a fra??o residual (F4), principalmente, nos solos com teores mais elevados de Fe. Verificou-se uma baixa associa??o com as fra??es mais l?beis F1 e F2 demonstrando a origem litog?nica dos mesmos. Os atributos qu?micos que mais influenciaram na especia??o dos metais nos solos representativos foram: pH, Ca, Fe, Mn, H+Al e Mg.Para o estudo dos fatores de variabilidade, na regi?o de Altura de Nazareno,foram verificadas correla??es elevadas entre os metais e, principalmente, com o Fe e argila. A separa??o em dois grupos permitiu uma distribui??o dentro dos grupos mais homog?nea, sendo o grupo 2 o de maior risco.A esp?cie Sporobollus indicus (L) foi um bom indicador para estudar a transfer?ncia de metais pesados nas plantas.

Eating disorders can lead to a negative impact on students' academic growth, nutrition and can cause death (Claude-Pierre, 1997; Manley, Rickson, & Standeven, 2000; Romeo, 1996). Early intervention by referring students to professional counseling might help counter these negative consequences. The teacher is in the position to assist students by providing health information, identifying those with problems, and intervening for a variety of dysfunctions that may include the eating disorders called anorexia nervosa and bulimia nervosa (Myers-Clark & Christopher, 2000). However teachers are in a difficult position to know when to address student concerns and judge what action to take (Ransley,1999). Teachers' engagement seems crucial (Smolak, Harris, Levine, & Shisslak, 2001) since eating disorders are being identified in younger children.The purpose of this study was to examine (a) the relationships of the theoretical constructs, attitude, subjective norm, and perceived behavioral control of the theory of planned behavior as predictors of behavioral intention (Ajzen & Fishbein, 1980) of middle school teachers to identify and refer suspected anorexia nervosa (AN) and/or bulimia nervosa (BN) students for professional help; and (b) the actual behavior of middle school teachers who reported having ever referred a student suspected of having AN and BN and those teachers who reported not having made such a referral. One hundred fourteen middle school teachers in Broward County, Florida volunteered to participate in the ex post facto research. Data were collected from a questionnaire. Multiple regression analysis revealed that the constructs of subjective norm (perception of what others think about one's performance of behavior combined with motivation to comply) and perceived behavioral control (perception regarding the extent of the difficulty of performing the behavior) were predictive of teachers' intent (likelihood of engaging in a behavior) to refer. However, the analysis revealed that attitude (overall positive or negative feeling with respect to performing the behavior) was not predictive of teachers' intent. Discriminant function analysis revealed that both intent and perceived behavioral control were predictive of group membership, either having referred a student suspected of having an eating disorder for counseling or not having made such a referral. Attitude and subjective norm were not predictive of group membership.

Made available in DSpace on 2014-12-17T15:38:55Z (GMT). No. of bitstreams: 1 AdrianaBR_DISSERT.pdf: 1721654 bytes, checksum: c674cc02c5cf1b9f45a2d13395454494 (MD5) Previous issue date: 2010-09-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The objective of this research was to investigate psychologist‟s practices at the Reference Specialized Center of Social Assistance (CREAS), special social care unit of medium complexity of the Unique System of Social Assistance (SUAS). With the creation of CREAS occurred the reorganization of specialized services and programs which were scattered within the socialassitantial network and began to be part of this center, creating a mosaic of actions directed to people with their rights violated. At the same time, there was a significant arrival of psychologists to the field of Social Assistance and their questioning facing specialized social demands and the (un)definitions of SUAS‟ policy concerning to special social protection. Was aimed in this research to investigate how psychologist‟s practices are developed at CREAS using semi-structured interviews and following the practices developed by three psychologists at a CREAS in the state of Rio Grande do Norte (RN), indicated by the Ministry of Social Development and Fight against Hunger (MDS) as one of the national references in 2008. It was highlighted a complex work field, which is delineated between the user?s rights perspective and the maintenance of historical difficulties concerning to the Social Assistance. In which the professional is requested to act toward the fight against rights violation, but does not find a field where is possible inter-sector and articulated work, in addition of being exposed to the precariousness of work and the weakness of employment ties, associated to the lack of formation to work in the area. Accordingly, there is still a range of challenges to psychologists in the building of a profession which confront risk situations and break off rights violation. / O objetivo desta pesquisa foi investigar a atua??o do psic?logo no Centro de Refer?ncia Especializado de Assist?ncia Social (CREAS), unidade da prote??o social especial de m?dia complexidade do Sistema ?nico de Assist?ncia Social (SUAS). Com a cria??o do CREAS ocorre o reordenamento de servi?os e programas especializados que estavam dispersos na rede socioassistencial que passam a compor esse centro, formando um mosaico de a??es voltadas para as pessoas com os direitos violados. Concomitantemente, h? a entrada significativa de psic?logos no campo da Assist?ncia Social e os questionamentos desses profissionais frente ?s demandas sociais especializadas e ?s (in)defini??es da pol?tica do SUAS quanto ? prote??o social especial. Buscou-se nesta pesquisa investigar como a atua??o do psic?logo ocorre no CREAS por meio de entrevista semi-estruturada e de acompanhamento das pr?ticas desenvolvidas por tr?s psic?logas em um CREAS no Rio Grande do Norte (RN), apontado como uma das refer?ncias nacionais pelo Minist?rio do Desenvolvimento Social e Combate ? Fome (MDS) em 2008. Evidenciou-se um campo complexo de atua??o, que se delineia entre a perspectiva do direito do usu?rio e a manuten??o de dificuldades hist?ricas pertinentes a Assist?ncia Social. Em que o profissional ? solicitado a agir para enfrentamento da viola??o do direito, mas n?o encontra um campo que possibilite o trabalho intersetorial e articulado, al?m de estar exposto a precariza??o do trabalho e a fragilidade dos v?nculos empregat?cios, associado ? falta de forma??o para atuar na ?rea. Portanto, ainda h? muitos desafios para os psic?logos na constru??o de um trabalho que enfrente as situa??es de risco e rompa com a viola??o de direitos.

Made available in DSpace on 2014-12-17T15:46:25Z (GMT). No. of bitstreams: 1 ValeriaRCO_DISSERT.pdf: 1256287 bytes, checksum: 332c4191ad68117fd9f3926a5bec4137 (MD5) Previous issue date: 2009-12-29 / This work demonstrates the results obtained from research on violence against women: an analysis of the work from reference center of the Social Assistance-CREAS, held in the city of Parnamirim/RN from September 2008 extending through the february of 2009. Having as goal to investigate and examine in a longitudinal cut, which specifically covers the period from 2006 to 2007, find out extent the actions taken by the Reference Center Specialized Social Assistance-CREAS, contributed to the change of women who were there, by checking if there was any change in their positions ahead of the violence and if they began to realize how social subjects, able to control their living conditions and interfere in the orientation of social dynamics Have a particular emphasis on the presence of work and schooling or lack of them is also a factor to be allied to the barriers and rules imposed on women in contemporary society. In this study it was found through a qualitative research guided by dialectical and implemented through the use of documentary research, observation, semi-structured interview and an extensive theoretical background on the subject in question that the woman victim of violence is in a complex and contradictory context where there is both the construction and deconstruction of rights, a view that there are strong influences of patriarchal culture and the consequences of social issues that specifically searched for the public, focuses on social, economic , political, social and cultural. In this sense, the National Policy to Combat Violence against Women, operated by CREASE Parnamirim, is also reflected in its early stages in the life of these women are to nurture a real chance for these victims of violence, to perceive themselves as social subjects can control their lives and interfere in their own destinies. We want this study to add more knowledge to help and most appropriate intervention in this reality, but without the intention of reaching exhaustion, but to subsidize future studies on the topic of women victims of violence / O presente trabalho apresenta os resultados obtidos atrav?s da pesquisa: viol?ncia contra a mulher: uma an?lise do trabalho do centro de refer?ncia da assist?ncia social-CREAS, realizada no munic?pio de Parnamirim/RN no per?odo de setembro de 2008 a fevereiro de 2009. Tendo como objetivo investigar e analisar, em um recorte longitudinal, que compreende especificamente o per?odo de 2006 a 2007, at? que ponto as a??es desenvolvidas pelo Centro de Refer?ncia Especializado de Assist?ncia Social-CREAS, contribuiram para a modifica??o das mulheres que foram atendidas, verificando se houve alguma mudan?a em suas posturas frente ? situa??o de viol?ncia, e se estas passaram a se perceber enquanto sujeitos sociais, capazes de interferir em suas situa??es de vida e na orienta??o da din?mica social, objetivou tamb?m verificar se a presen?a do trabalho e da escolariza??o (ou a falta destes) ? tamb?m um elemento a ser aliado aos entraves impostos ?s mulheres na sociedade contempor?nea. No referido estudo constatou-se, atrav?s de uma pesquisa qualitativa norteada pela concep??o dial?tica e aplicada atrav?s do emprego de pesquisa documental, observa??o, entrevistas semiestruturadas e fundamenta??o te?rica sobre a tem?tica em quest?o, que a mulher v?tima de viol?ncia, encontra-se em um complexo e contradit?rio contexto, no qual existe ao mesmo tempo a constru??o e a desconstru??o de direitos, tendo em vista a exist?ncia de fortes influ?ncias da cultura patriarcal e de manifesta??es da quest?o social na vida do p?blico pesquisado, incidindo nos aspectos sociais, econ?micos, pol?ticos, sociais e culturais. Neste sentido, a Pol?tica Nacional de Enfrentamento ? Viol?ncia contra a Mulher, operacionalizada pelo CREAS-Parnamirim, se traduz ainda de forma incipiente na vida destas mulheres n?o oportunizando possibilidades reais para essas v?timas de viol?ncia se perceberem enquanto sujeitos sociais capazes de controlar suas vidas e interferirem em seus pr?prios destinos. Desta feita o referido estudo, n?o tem a pretens?o de esgotar a tem?tica da viol?ncia contra mulher e sim subsidiar futuros estudos

Made available in DSpace on 2014-12-17T15:47:50Z (GMT). No. of bitstreams: 1 JoseDSS.pdf: 1294518 bytes, checksum: aa9617f35bc3b6c43b4ee10931265d07 (MD5) Previous issue date: 2009-02-26 / Middleware platforms have been widely used as an underlying infrastructure to the development of distributed applications. They provide distribution and heterogeneity transparency and a set of services that ease the construction of distributed applications. Nowadays, the middlewares accommodate an increasing variety of requirements to satisfy distinct application domains. This broad range of application requirements increases the complexity of the middleware, due to the introduction of many cross-cutting concerns in the architecture, which are not properly modularized by traditional programming techniques, resulting in a tangling and spread of theses concerns in the middleware code. The presence of these cross-cutting concerns limits the middleware scalability and aspect-oriented paradigm has been used successfully to improve the modularity, extensibility and customization capabilities of middleware. This work presents AO-OiL, an aspect-oriented (AO) middleware architecture, based on the AO middleware reference architecture. This middleware follows the philosophy that the middleware functionalities must be driven by the application requirements. AO-OiL consists in an AO refactoring of the OiL (Orb in Lua) middleware in order to separate basic and crosscutting concerns. The proposed architecture was implemented in Lua and RE-AspectLua. To evaluate the refactoring impact in the middleware architecture, this paper presents a comparative analysis of performance between AO-OiL and OiL / As plataformas de middlewares t?m sido amplamente utilizadas como infra-estrutura subjacente para o desenvolvimento de sistemas distribu?dos. Elas fornecem transpar?ncia de localiza??o e de heterogeneidade e um conjunto de servi?os que facilitam a constru??o de aplica??es distribu?das. Atualmente, os middlewares acomodam uma variedade crescente de requisitos a fim de atender aos mais variados dom?nios de aplica??o. Essa ampla variedade de requisitos procovou um aumento na complexidade dos middleware, devido a introdu??o de v?rios conceitos transversais na arquitetura. Tais conceitos n?o s?o modularizados adequadamente pelas t?cnicas de programa??o tradicionais, resultando no espalhamento e entrela?amento desses conceitos no c?digo do middleware. A presen?a de conceitos transversais limitam a escalabilidade do middleware. O paradigma orientado a aspectos tem sido utilizado com sucesso para melhorar a extensibilidade, a modularidade e a capacidade de personaliza??o das plataformas de middleware atrav?s da separa??o dos conceitos transversais do c?digo base da middleware. Este trabalho apresenta o AO-OiL, uma arquitetura de um middleware orientado a aspectos (OA) dinamicamente adapt?vel, baseado na arquitetura de refer?ncia para middlewares OA. O AO-OiL consiste em uma refatora??o orientada a aspectos do middleware OiL (Orb in Lua) para separa??o de conceitos b?sicos e conceitos transversais e segue a filosofia de que as funcionalidades do middleware devem ser ditadas pelos requisitos da aplica??o. A arquitetura proposta foi implementada em Lua e RE-AspectLua. Para avaliar o impacto da refatora??o na arquitetura, esse trabalho apresenta uma an?lise comparativa de desempenho entre o AO-OiL e o OiL

Background: Changing service demands require United Kingdom ambulance services to redefine their role and response strategies, in order to reduce unnecessary Emergency Department attendances. Treat and Refer guidelines have been developed with this aim in mind. However, these guidelines have been developed in the absence of reliable evidence or guiding mid-range theory. This has resulted in inconsistencies in clinical practice. One condition frequently included in Treat and Refer guidelines is hypoglycaemia. Therefore this thesis aimed to investigate prehospital hypoglycaemic emergencies in order to develop an evidence base for future interventions and guideline development. Research approach: A pragmatic and inductive applied health services research approach was employed. Multiple methods were used in a sequential explanatory design. Three linked studies were undertaken with the results of previous studies informing the development of the next. Study one: A scoping review of prehospital treatment of hypoglycaemic events. Aims: i) To describe the demographics of the patient population requiring ambulance service assistance for hypoglycaemic emergencies; ii) To determine the extent to which post-hypoglycaemic patients with diabetes, who are prescribed oral hypoglycaemic agents (OHA), experience repeat hypoglycaemic events (RHE) after being treated in the prehospital environment. Methods: A scoping literature review was conducted using an overlapping retrieval strategy that included both published and unpublished literature. Findings: Twenty-three papers and other relevant material were included. Hypoglycaemia related ambulance calls account for 1.3% to 5.2% of ambulance calls internationally. Transportation rates varied between studies (25%-73%). Repeat hypoglycaemic emergencies are experienced by 2-7% of patients within 48 hours. There was insufficient detail to determine any relationship between repeat events and OHA. The low quality of included papers means that the results should be cautiously interpreted. The safety of leaving patients on OHA at home post hypoglycaemic emergency is unknown. Consequently patients taking OHAs who experience a hypoglycaemic emergency should be transported to hospital for observation. There was a lack of knowledge about the Scottish demographics of the patient population. Study two: A retrospective cross-sectional observational study of diabetes related emergency calls. Aims: To investigate i) the patient demographics and characteristics of hypoglycaemia related emergency calls; ii) the incidence of repeat hypoglycaemic events; and iii) the factors associated with emergency calls that result in individuals being left at home. Methods: A retrospective observational cross-sectional study conducted using Medical Priority Dispatch System® call data from West of Scotland Ambulance Control Centre over a 12 month period. Data were extracted on age, gender, dispatch code, time of call, deprivation category, and immediate outcome (home or hospital). Multiple regression analysis was used to determine predictors of remaining at home. Findings: 1319 calls for hypoglycaemia were received. Patient demographics were similar to the scoping review findings. Most patients remained at home (N = 916 vs N = 380; p < .001). RHE’s were experience by 3.1% within 48 hours, and 10.6% within two weeks. The most significant independent predictor for patients remaining at home was a prior call to the ambulance service (OR of 2.4 [95%CI 1.5 to 3.7]). Patients’ reasons for remaining at home and the causes of subsequent severe events are unknown. It is likely that non-clinical factors may explain some of this behaviour. Study 3: Investigating patients’ experiences of prehospital hypoglycaemic care. Aim: To investigate the experiences of patients who are attended by ambulance clinicians for a hypoglycaemic emergency. Methods: In-depth interviews with adults with diabetes who had recently experienced a hypoglycaemic emergency treated by ambulance clinicians. Participants were recruited from Greater Glasgow and Clyde and Lanarkshire Health Board areas. Data were analysed using Framework Analysis. Findings: Twenty six patients were interviewed. Three key themes were developed. Firstly, an explanation for help seeking behaviour; patients’ impaired awareness of hypoglycaemia as well as the inability of friends and relatives to cope can contribute to an ambulance call-out. Secondly, the perceptions of ambulance service care; patients felt the service provided was good; however ambulance clinicians’ advice was inconsistent. Thirdly, the influences on uptake of follow-up care; patient preferences for follow-up care were influenced by previous experiences of home, hospital and primary care. Post-hoc analysis identified three psychological theories that may explain these findings and provide a useful basis for intervention development: Common Sense Model (Leventhal et al, 1998); Health Belief Model (Rosenstock, 1966); Ley’s cognitive hypothesis model of communication (Ley and Llewelyn, 1995; 1981). Conclusion: Most people treated for severe hypoglycaemia by ambulance clinicians remain at home and do not follow-up their care. A few experience repeat hypoglycaemic emergencies. Key causal, but modifiable factors, contributing to this include:- impaired awareness of hypoglycaemia; inconsistent delivery of ambulance clinician referral advice; and patients’ perceptions of the costs and benefits of follow-up care. Ambulance services cannot address all these factors in isolation. The studies in this thesis have generated an evidence base and identified plausible candidate theories. This will support the future development of novel interventions to improve severe hypoglycaemic emergency follow-up.

Made available in DSpace on 2014-12-17T14:36:28Z (GMT). No. of bitstreams: 1 EugenioPAF_DISSERT.pdf: 1419317 bytes, checksum: 6c7f01966147b6a5c73876d1d6a87da8 (MD5) Previous issue date: 2010-10-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This dissertation was written for the making of a model to be used as reference to the construction and diagnoses of educational projects in on-line environments. The model approaches a series of characteristics, technical and humans, which if considered can increase the potential of awake the interests to the active use of these projects for the students and build conditions to the development of an active posture by the students, fundamental factor to the educational advances. Focused in the students, not in the technology in use, we propose this model as a guide, reference to be used in a critical way in relation with every educational context. This research was made from the qualitative category, trough the method of study of case, using as reference to the analysis the use of the website guanabara.info - website outside of the school context - by it users, heard through the internet, by the use of semi-opened interview, in a data taken of the primary type. We follow as theoretical references Paulo Freire?s work, considering his vision of education and the building of knowledge as a process which occurs between man, and Celest?n Freinet, in his pedagogy of humanized and critical insertion of the technologies in the school. At the end, we show the practical utilization of the model constructed using it for the diagnostics of an educational project in the on-line educational environmental moodle / Esta disserta??o foi realizada no intuito da elabora??o de um modelo a ser usado como refer?ncia na constru??o e diagn?stico de projetos educativos em ambiente on-line. O modelo aborda uma s?rie de caracter?sticas, t?cnicas e humanas, que, se trabalhadas, podem ampliar o potencial de despertar o interesse, al?m da simples obriga??o institucional, ao uso desses projetos por parte dos alunos e, por consequ?ncia, criar condi??es prop?cias ao poss?vel desenvolvimento de uma postura ativa desses, fator fundamental aos avan?os educativos. Focando-se nos alunos, e n?o na tecnologia utilizada, propomos este modelo como guia, refer?ncia a ter sua aplica??o realizada de forma cr?tica, relativizada a cada contexto educativo. Esta pesquisa foi realizada a partir da categoria qualitativa, pelo m?todo de observa??o participante, utilizando como refer?ncia ?s an?lises o uso dos sujeitos participantes do site "guanabara.info" - site educativo fora do contexto escolar - entrevistados a dist?ncia, pela internet, a partir do uso da t?cnica de entrevista semi-aberta, em uma coleta de dados do tipo prim?rios. Seguimos como referenciais te?ricos os trabalhos de Paulo Freire, considerando sua vis?o de educa??o e forma??o do conhecimento como um processo entre os homens, e de C?lestin Freinet, em sua pedagogia de inser??o humanizada e cr?tica de tecnologias na escola. Ao final, demonstramos a utiliza??o pr?tica do modelo elaborado aplicando-o ao diagn?stico de um projeto educativo realizado na plataforma on-line moodle

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-29T21:40:50Z No. of bitstreams: 1 CarlosAlbertoNunesMachado_TESE.pdf: 4383936 bytes, checksum: f242b77bd956f24ec3818296ce30b852 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-01T19:53:18Z (GMT) No. of bitstreams: 1 CarlosAlbertoNunesMachado_TESE.pdf: 4383936 bytes, checksum: f242b77bd956f24ec3818296ce30b852 (MD5) / Made available in DSpace on 2016-03-01T19:53:18Z (GMT). No. of bitstreams: 1 CarlosAlbertoNunesMachado_TESE.pdf: 4383936 bytes, checksum: f242b77bd956f24ec3818296ce30b852 (MD5) Previous issue date: 2015-01-29 / A computa??o ub?qua ? um paradigma no qual dispositivos com capacidade de processamento e comunica??o s?o embutidos nos elementos comuns de nossas vidas (casas, carros, m?quinas fotogr?ficas, telefones, escolas, museus, etc), provendo servi?os com um alto grau de mobilidade e transpar?ncia. O desenvolvimento de sistemas ub?quos ? uma tarefa complexa, uma vez que envolve v?rias ?reas da computa??o, como Engenharia de Software, Intelig?ncia Artificial e Sistemas Distribu?dos. Essa tarefa torna-se ainda mais complexa pela aus?ncia de uma arquitetura de refer?ncia para guiar o desenvolvimento de tais sistemas. Arquiteturas de refer?ncia t?m sido usadas para fornecer uma base comum e dar diretrizes para a constru??o de arquiteturas de softwares para diferentes classes de sistemas. Por outro lado, as linguagens de descri??o arquitetural (ADLs) fornecem uma sintaxe para representa??o estrutural dos elementos arquiteturais, suas restri??es e intera??es, permitindo-se expressar modelo arquitetural de sistemas. Atualmente n?o h?, na literatura, ADLs baseadas em arquiteturas de refer?ncia para o dom?nio de computa??o ub?qua. De forma a permitir a modelagem arquitetural de aplica??es ub?quas, esse trabalho tem como objetivo principal especificar UbiACME, uma linguagem de descri??o arquitetural para aplica??es ub?quas, bem como disponibilizar a ferramenta UbiACME Studio, que permitir? arquitetos de software realizar modelagens usando UbiACME. Para esse fim, inicialmente realizamos uma revis?o sistem?tica, de forma a investigar na literatura relacionada com sistemas ub?quos, os elementos comuns a esses sistemas que devem ser considerados no projeto de UbiACME. Al?m disso, com base na revis?o sistem?tica, definimos uma arquitetura de refer?ncia para sistemas ub?quos, RA-Ubi, que ? a base para a defini??o dos elementos necess?rios para a modelagem arquitetural e, portanto, fornece subs?dios para a defini??o dos elementos de UbiACME. Por fim, de forma a validar a linguagem e a ferramenta, apresentamos um experimento controlado onde arquitetos modelam uma aplica??o ub?qua usando UbiACME Studio e comparam com a modelagem da mesma aplica??o em SySML.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-15T20:05:32Z No. of bitstreams: 1 RenataLeirosRomano_DISSERT.pdf: 1008486 bytes, checksum: f2d46f6f630afa5c5fa1d8dd0dd5b332 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-19T23:10:42Z (GMT) No. of bitstreams: 1 RenataLeirosRomano_DISSERT.pdf: 1008486 bytes, checksum: f2d46f6f630afa5c5fa1d8dd0dd5b332 (MD5) / Made available in DSpace on 2016-04-19T23:10:42Z (GMT). No. of bitstreams: 1 RenataLeirosRomano_DISSERT.pdf: 1008486 bytes, checksum: f2d46f6f630afa5c5fa1d8dd0dd5b332 (MD5) Previous issue date: 2015-06-23 / Os geradores s?ncronos, predominantes nos sistemas de gera??o de energia el?trica, devem fornecer valores de tens?o e frequ?ncia constantes para que seja obtida uma boa qualidade da energia gerada. Por?m, para situa??es em que esses sistemas sofrem gran- des varia??es de carga, h? dificuldade de que sejam mantidos os valores nominais nas sa?das do gerador devido ?s incertezas param?tricas, n?o linearidades e alto grau de aco- plamento entre as vari?veis. Prop?e-se, ent?o, a aplica??o do Controlador em Modo Dual Adaptativo Robusto (DMARC) para o controle do fluxo de campo, em substitui??o aos tradicionais controladores PIs. O DMARC estabelece uma liga??o entre um controlador adaptativo por modelo de refer?ncia (MRAC) e um controlador adaptativo por modelo de refer?ncia e estrutura vari?vel (VS-MRAC), incorporando as vantagens de desempenho transit?rio do controlador VS-MRAC com as propriedades de regime permanente do con- trolador MRAC convencional. S?o feitas an?lises atrav?s de simula??es como forma de verificar o funcionamento do controlador proposto, bem como compar?-lo com o sistema atualmente em uso. / Synchronous machines, widely used in energy generation systems, require constant voltage and frequency to obtain good quality of energy. However, for large load variati- ons, it is difficult to maintain outputs on nominal values due to parametric uncertainties, nonlinearities and coupling among variables. Then, we propose to apply the Dual Mode Adaptive Robust Controller (DMARC) in the field flux control loop, replacing the tradi- tional PI controller. The DMARC links a Model Reference Adaptive Controller (MRAC) and a Variable Structure Model Reference Adaptive Controller (VS-MRAC), incorpora- ting transient performance advantages from VS-MRAC and steady state properties from MRAC. Moreover, simulation results are included to corroborate the theoretical studies.

Made available in DSpace on 2014-12-17T14:54:50Z (GMT). No. of bitstreams: 1 CaioDC.pdf: 2782026 bytes, checksum: ffc0e89b5e796daecc6152d3075b6918 (MD5) Previous issue date: 2008-01-24 / The so-called Dual Mode Adaptive Robust Control (DMARC) is proposed. The DMARC is a control strategy which interpolates the Model Reference Adaptive Control (MRAC) and the Variable Structure Model Reference Adaptive Control (VS-MRAC). The main idea is to incorporate the transient performance advantages of the VS-MRAC controller with the smoothness control signal in steady-state of the MRAC controller. Two basic algorithms are developed for the DMARC controller. In the first algorithm the controller's adjustment is made, in real time, through the variation of a parameter in the adaptation law. In the second algorithm the control law is generated, using fuzzy logic with Takagi-Sugeno s model, to obtain a combination of the MRAC and VS-MRAC control laws. In both cases, the combined control structure is shown to be robust to the parametric uncertainties and external disturbances, with a fast transient performance, practically without oscillations, and a smoothness steady-state control signal / Neste trabalho ? apresentada uma proposta de um controlador, denominado Controlador em Modo Dual Adaptativo Robusto (DMARC), que estabelece uma liga??o entre um controlador adaptativo por modelo de refer?ncia (MRAC) e um controlador adaptativo por modelo de refer?ncia e estrutura vari?vel (VS-MRAC). A id?ia b?sica ? incorporar as vantagens de desempenho transit?rio do controlador VS-MRAC com as propriedades de regime permanente do controlador MRAC convencional. S?o desenvolvidos dois algoritmos b?sicos para o controlador DMARC. No primeiro o ajuste do controlador ? feito, em tempo real, atrav?s da varia??o de um par?metro na lei de adapta??o. No segundo algoritmo a lei de controle ? gerada, utilizando o modelo Takagi-Sugeno da l?gica nebulosa, para obter uma composi??o ponderada das leis de controle do MRAC e do VS-MRAC. Em ambos os casos, o esquema combinado de controle ? mostrado ser robusto ?s incertezas param?tricas e perturba??es externas, al?m de apresentar um desempenho r?pido e pouco oscilat?rio durante o transit?rio e um sinal de controle suave em regime permanente