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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Um framework baseado em modelos para desenvolvimento de sistemas multim?dia distribu?dos autoadaptativos

Pinto, Felipe Alves Pereira 19 January 2011 (has links)
Made available in DSpace on 2014-12-17T15:47:53Z (GMT). No. of bitstreams: 1 FelipeAPP_DISSERT.pdf: 2094888 bytes, checksum: 2f662bc70058d8584f0a23ab28517f43 (MD5) Previous issue date: 2011-01-19 / Distributed multimedia systems have highly variable characteristics, resulting in new requirements while new technologies become available or in the need for adequacy in accordance with the amount of available resources. So, these systems should provide support for dynamic adaptations in order to adjust their structures and behaviors at runtime. This paper presents an approach to adaptation model-based and proposes a reflective and component-based framework for construction and support of self-adaptive distributed multimedia systems, providing many facilities for the development and evolution of such systems, such as dynamic adaptation. The propose is to keep one or more models to represent the system at runtime, so some external entity can perform an analysis of these models by identifying problems and trying to solve them. These models integrate the reflective meta-level, acting as a system self-representation. The framework defines a meta-model for description of self-adaptive distributed multimedia applications, which can represent components and their relationships, policies for QoS specification and adaptation actions. Additionally, this paper proposes an ADL and architecture for model-based adaptation. As a case study, this paper presents some scenarios to demonstrate the application of the framework in practice, with and without the use of ADL, as well as check some characteristics related to dynamic adaptation / Sistemas multim?dia distribu?dos possuem caracter?sticas bastante vari?veis, podendo implicar em novos requisitos ? medida que novas tecnologias s?o disponibilizadas ou na necessidade de adequa??o de acordo com a quantidade de recursos dispon?veis. Dessa forma, tais aplica??es devem ser capazes de realizar ajustes e adapta??es din?micas, permitindo alterar sua estrutura e comportamento. Com o objetivo de prover capacidades de autoadapta??o nesses sistemas, este trabalho apresenta uma abordagem de adapta??o baseada em modelos. ? proposto um framework reflexivo e baseado em componentes para a constru??o e suporte de sistemas multim?dia distribu?dos autoadaptativos, fornecendo v?rias facilidades para o desenvolvimento e evolu??o de tais sistemas, como adapta??o din?mica. A proposta do framework ? manter um ou mais modelos de representa??o do sistema em tempo de execu??o, de modo que alguma entidade externa possa realizar uma an?lise desses modelos identificando problemas e tentando resolv?-los. Esses modelos integram o metan?vel reflexivo das aplica??es atuando como uma autorrepresenta??o do sistema. Para isso, o framework define um metamodelo para a descri??o de aplica??es multim?dia distribu?das autoadaptativas, o qual ? capaz de representar componentes e seus relacionamentos, pol?ticas para especifica??o de QoS e a??es de adapta??o. Adicionalmente, ? proposta uma ADL e uma arquitetura para adapta??o baseada em modelos. Como estudo de caso o trabalho apresenta alguns cen?rios buscando exemplificar o uso do framework na pr?tica, com e sem o uso da ADL, bem como verificar algumas caracter?sticas relacionadas ? adapta??o din?mica
32

Reabilitação sexual para homens com lesão medular adquirida : da auto-adaptação sexual à intervenção terapêutica / Sexual rehabilitation for spinal cord injured men: from sexual self-adjustment to the therapeutic intervention

Savall, Ana Carolina Rodrigues 11 April 2008 (has links)
Made available in DSpace on 2016-12-06T17:07:17Z (GMT). No. of bitstreams: 1 ANA CAROLINA RODRIGUES SAVALL.pdf: 3743284 bytes, checksum: 8a03e2cbfab2d798a7bd0caa156a97c5 (MD5) Previous issue date: 2008-04-11 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The present research was developed by means of three studies. The first one, composed by 62 men, aimed to evaluate the spinal cord injury impact on human sexuality, trying to identify the significantly affected sexual components. It was possible to verify alterations between the pre and post-injury periods: frequency and number of sexual partners significant reduction; anal sex practice considerable decrease; considerable modifications in the sexual preferences for hugging, vaginal penetration, vibrator use; variation in the pleasure originated in the following erogenous zones: mouth, neck, penis, thighs and legs; alterations in the sexual functions with significant reduction of the levels of desire, arousal and ejaculatory excitement, orgasm, as well as dysfunctions; sexual satisfaction significant reduction, even though some perceived alterations are equal to the general population. The results confirm the importance of giving assistance to the sexual sphere of these patients and found the proposal of sexual rehabilitation, serving as indicator. The second study involved the same population and aimed to analyze the sexual counseling, as well as understanding the post-injury sexual self-adaptation process. Between results, it was observed that less than half of the participants and only about one sixth of the partners received some type of sexual counseling. It was verified that the self-adaptation consists of a process influenced by some factors: age of incidence and time-of-onset, quality of received information, not being always successful, possessing peculiarities, such as the distinction between presence and absence of previous sexual experience before injury. The third study was composed by 25 people among researchers, relatives, health professionals, spinal cord injured men and their partners. It aimed to elaborate a sexual rehabilitation proposal that reflects the target population yearnings, necessities and potentialities. It was developed by means of Grupo Interdisciplinar de Apoio à Sexualidade Adaptada - GIASA, characterized by weekly 90 minutes meetings, divided in two stages: the first one, carried through May to September 2007, aiming to identify the pertinent subjects and the second one, between October and December 2007, with the purpose of presenting and discussing the subjects mentioned in the previous stage and to suggest evaluated strategies for the participants. While the first stage meetings had been marked by the discussion of free subjects, related to the sexuality, the second was composed for two moments: the first one, marked by seminaries, involving theoretical intervention on the previously definite subjects, with posterior opening for discussion, experiences exchange, reflection about the subjects and their respective approach, characterizing the focal group; and a second moment, where strategies characterizing the therapeutical interventions were applied, assessed and carried through interdisciplinarly, trying to involve the participants actively as citizens in the processes of focal discussion and theoretician-therapeutical intervention for the resolution of the diagnosed problem and considered for this research. Finally, based on the stages of the GIASA, it was elaborated a proposal of sexual rehabilitation called Grupo Interdisciplinar de Apoio à Saúde Sexual - GSex, generally directed to the community, and specially directed to the physically challenged people and/or chronic illnesses, being defined: purpose, action methodology, theoretical basis, principles, members functions, actions delineation, attendance process, among others topics. / A pesquisa desenvolveu-se mediante três estudos. O primeiro composto por 62 homens objetivou avaliar o impacto da lesão medular sobre a sexualidade humana, buscando identificar os componentes sexuais significativamente afetados. Verificou-se alterações entre os períodos pré e pós-lesão medular: diminuição significativa da freqüência e número de parceiros sexuais; redução sensível da prática sexual de sexo anal; modificações consideráveis nas preferências sexuais por abraço, penetração vaginal, utilização de vibrador; variação no prazer advindo das zonas erógenas da boca, pescoço, pênis, coxas e pernas; alterações nas funções sexuais com redução significativa dos níveis de desejo, excitação e orgasmo, bem como disfunções erétil e ejaculatória; redução significativa na satisfação sexual, embora algumas alterações percebidas equiparam-se à população em geral. Os resultados confirmam a importância de se prestar assistência à esfera sexual desses pacientes e embasam a proposta de reabilitação sexual, servindo como indicadores. O segundo estudo composto pela mesma população objetivou analisar o aconselhamento sexual e compreender o processo de auto-adaptação sexual pós-lesão medular. Entre os resultados observou-se que menos da metade dos participantes e apenas cerca de um a cada seis parceiros recebeu algum tipo de aconselhamento sexual. Verificou-se que a auto-adaptação consiste em processo influenciado por vários fatores: idade de incidência e tempo de lesão, qualidade das informações recebidas,não sendo sempre exitoso, possuindo peculiaridades como a distinção entre presença e ausência de experiência sexual prévia à lesão. O terceiro estudo foi composto por 25 pessoas entre pesquisadores, profissionais da saúde, homens com lesão medular, parceiras e familiares objetivando elaborar proposta de reabilitação sexual que refletisse os anseios, necessidades e potencialidades da população destinada. Desenvolveu-se por meio do Grupo Interdisciplinar de Apoio à Sexualidade Adaptada GIASA, caracterizado por encontros semanais com 90 minutos de duração, em duas etapas: a primeira realizada entre maio e setembro de 2007 que objetivou identificar os temas pertinentes e a segunda, entre outubro e dezembro, com a finalidade de apresentar e discutir com propriedade os temas propostos pela etapa anterior e sugerir estratégias avaliadas pelos participantes. Enquanto os encontros da primeira etapa foram marcados por discussões de temas livres relacionados à sexualidade, a segunda foi composta por dois momentos: um marcado por seminário, compreendendo intervenção teórica sobre os temas previamente definidos, com posterior abertura para discussão, troca de experiências, reflexão quanto à temática e forma de abordagem, caracterizando o grupo focal; e um segundo momento, onde foram aplicadas e avaliadas as estratégias caracterizando as intervenções terapêuticas, realizadas interdisciplinarmente, procurando-se envolver os participantes ativamente como sujeitos nos processos de discussão focal e intervenção teórico-terapêutica para a resolução do problema diagnosticado e proposto por esta pesquisa. Por fim, baseando-se nas etapas do GIASA, elaborou-se a proposta de reabilitação sexual denominada Grupo Interdisciplinar de Apoio à Saúde Sexual GSex, voltado à comunidade em geral, em especial a pessoas com deficiências físicas e/ou doenças crônicas, sendo definidos: finalidade, metodologia de ação, fundamentação teórica, princípios, funções dos membros, delineamento das ações, processo de atendimento, entre outros tópicos.
33

Applying Artificial Neural Networks to Reduce the Adaptation Space in Self-Adaptive Systems : an exploratory work

Buttar, Sarpreet Singh January 2019 (has links)
Self-adaptive systems have limited time to adjust their configurations whenever their adaptation goals, i.e., quality requirements, are violated due to some runtime uncertainties. Within the available time, they need to analyze their adaptation space, i.e., a set of configurations, to find the best adaptation option, i.e., configuration, that can achieve their adaptation goals. Existing formal analysis approaches find the best adaptation option by analyzing the entire adaptation space. However, exhaustive analysis requires time and resources and is therefore only efficient when the adaptation space is small. The size of the adaptation space is often in hundreds or thousands, which makes formal analysis approaches inefficient in large-scale self-adaptive systems. In this thesis, we tackle this problem by presenting an online learning approach that enables formal analysis approaches to analyze large adaptation spaces efficiently. The approach integrates with the standard feedback loop and reduces the adaptation space to a subset of adaptation options that are relevant to the current runtime uncertainties. The subset is then analyzed by the formal analysis approaches, which allows them to complete the analysis faster and efficiently within the available time. We evaluate our approach on two different instances of an Internet of Things application. The evaluation shows that our approach dramatically reduces the adaptation space and analysis time without compromising the adaptation goals.

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