Uso de replicação móvel para distribuição de vídeo digital em redes de computadores

A maioria da soluções apresentadas como candidatas à implementação de serviços de distribuição de áudio e vídeo, têm sido projetadas levando-se em consideração determinadas condições de infra-estrutura, formato dos fluxos de vídeo a serem transmitidos, ou ainda os tipos de clientes que serão atendidos pelo serviço. Aplicações que utilizam serviços de distribuição de vídeo normalmente precisam lidar com grandes oscilações na demanda pelo serviço devido a entrada e saída de usuários do serviço. Com exemplo, basta observar a enorme variação nos níveis de audiência de programas de televisão. Este comportamento coloca um importante requisito para esta classe de sistemas distribuídos: a capacidade de reconfiguração como conseqüência de variações na demanda. Esta dissertação apresenta um estudo que envolveu o uso de agentes móveis para implementar os servidores de um serviço de distribuição de vídeo denominada DynaVideo. Uma das principais características deste serviço é a capacidade de ajustar sua configuração em conseqüência de variações na demanda. Como os servidores DynaVideo podem replicar-se e são implementados como código móvel, seu posicionamento pode ser otimizado para atender uma dada demanda e, como conseqüência, a configuração do serviço pode ser ajustada para minimizar o consumo de recursos necessários para distribuir vídeo para seus usuários. A principal contribuição desta dissertação foi provar a viabilidade do conceito de servidores implementados como agentes móveis Java baseados no ambiente de desenvolvimento de software Aglet.

GingaForAll: linha de Produtos do Middleware Ginga

Many challenges have been imposed on the middleware to support applications for digital TV because of the heterogeneity and resource constraints of execution platforms. In this scenario, the middleware must be highly configurable so that it can be customized to meet the requirements of applications and underlying platforms. This work aims to present the GingaForAll, a software product line developed for the Ginga - the middleware of the Brazilian Digital TV (SBTVD). GingaForAll adds the concepts of software product line, aspect orientation and model-driven development to allow: (i) the specification of the common characteristics and variables of the middleware, (ii) the modularization of crosscutting concerns - both mandatory and concepts variables - through aspects, (iii) the expression of concepts as a set of models that increase the level of abstraction and enables management of various software artifacts in terms of configurable models. This work presents the architecture of the software product line that implements such a tool and architecture that supports automatic customization of middleware. The work also presents a tool that implements the process of generating products GingaForAll

Arquitetura com elevada taxa de processamento e reduzida largura de banda de memória para a estimação de movimento em vídeos digitais

Nowadays several electronics devices support digital videos. Some examples of these devices are cellphones, digital cameras, video cameras and digital televisions. However, raw videos present a huge amount of data, millions of bits, for their representation as the way they were captured. To store them in its primary form it would be necessary a huge amount of disk space and a huge bandwidth to allow the transmission of these data. The video compression becomes essential to make possible information storage and transmission. Motion Estimation is a technique used in the video coder that explores the temporal redundancy present in video sequences to reduce the amount of data necessary to represent the information. This work presents a hardware architecture of a motion estimation module for high resolution videos according to H.264/AVC standard. The H.264/AVC is the most advanced video coder standard, with several new features which allow it to achieve high compression rates. The architecture presented in this work was developed to provide a high data reuse. The data reuse schema adopted reduces the bandwidth required to execute motion estimation. The motion estimation is the task responsible for the largest share of the gains obtained with the H.264/AVC standard so this module is essential for final video coder performance. This work is included in Rede H.264 project which aims to develop Brazilian technology for Brazilian System of Digital Television

Percepção de cuidadores de crianças acerca da prevenção de acidentes domésticos infantis: análise à luz do modelo de crenças em saúde

This study aimed to analyze the perception of home caregivers of children from zero to five years-old on child domestic accidents and their influence in preventing these events. Exploratory and descriptive study with a qualitative approach, conducted with 20 caregivers attended at the Family Health Unit of Cidade Nova in Natal/Rio Grande do Norte, Brazil. The participants should have age less than 18 years-old, being a caregiver of at least a five year-old child and living in the area ascribed of Family Health Unit in the neighborhood Cidade Nova. Data collection occurred between March and April 2013 and a semistructured interview script was used. This stage was preceded by the acquiescence of the director of health institution where the research was developed, the Health Department of the Municipality of Natal as well as the Ethics Committee in Research of Universidade Federal do Rio Grande do Norte under Opinion nº 219 872 and CAAE nº 12236013.7.0000.5537. It is noted that respondents were asked to formal authorization by the Term of Consent. The data were treated according to the technique of the Collective Subject Discourse and analyzed based on three dimensions of the Health Belief Model, relating to perceptions of susceptibility to infant domestic accidents, self-efficacy to prevent infant and indicia domestic accidents for action of preventing domestic accidents in childhood. The results revealed that all the respondents were women, who, in their majority, they are mothers of the children they care, and predominantly they are aged between 18 and 30 years-old, full high school education and unemployed. Concerning the perception of susceptibility, it was unveiled understanding of deponents on various types of accidents, which are considered preventable. For this purpose, it was highlighted that the constant surveillance of the children is essential, keeping in view their high degree of curiosity and immaturity. On the perceived selfefficacy, the participants reported adopting preventive measures; however, they reported experiencing falls, burns, electric shocks and dog bites. In regard to the meaning attributed to experienced accidents they highlighted their feelings of guilt and despair, particularly about the cases understood as serious. Regarding the last dimension analyzed, related to indications for action, family, friends and television were the main source of information about household accidents and their prevention methods; however, health professionals were rarely cited as issuers of such knowledge. It is concluded that there is a widespread perception of women about prevention of domestic accidents and the weakness in the view of health professionals, including nurses, as disseminators of this information. This suggests the need to strengthen the dialogue on the issue and encouraging the participation of caregivers actively in the prevention of child domestic accidents

A TV como objeto de leitura da imagem no contexto escolar: uma pesquisa-ação com alunos do ensino médio

This research seeks to reflect on the dynamics of television reception, studying the Brazilian TV miniseries Hoje é Dia de Maria, produced by Globo Television Network, and aims to generally promote inferences in the process of image reading, mainly for aesthetic reading in school context, aiming at the formation of visual proficient readers. The research was conducted with students from the third grade of a state high school, geographically located in the city of Natal, Rio Grande do Norte. The theoretical framework comes from the assumptions of cognitive social interactionism to understand language, and it is also based on the ideas of Bakhtin (1992) and Vygotsky (1998), which enabled us to understand the social interaction and the Theory of Aesthetics Reception and Aesthetic Effect with Jauss (1979) and Iser (1999), which provided a better understanding of aesthetic experience, aesthetic effects and production of meaning. The methodological approach assumes a qualitative nature and an interpretive bias, accomplished through interviews, observation, questionnaire and application of a set of investigative activities, such as introductory exposition of themes, handing out of images and mediation process. This research is the result of a research-action process in a pedagogical intervention in a state school. The results indicate that the interactional linguistic resources used by the speakers demonstrated lack of prior knowledge and repertoire regarding image reading, which initially led them to do a cursory reading. It was evident that the respondents were unaware of the initial proposal. However, throughout the meetings, it was possible to realize their transformation, because the pre-established concepts were analyzed with the help of mediation, so that the group felt more autonomous and safe to read images at the end. The survey also showed significant data, so that the school could develop new methods of teaching televisual reading.

Jornalismo público em questão: uma análise do TVU Notícias

Esta dissertação analisa um programa jornalístico da TV Universitária do RN e sua possível contribuição para a formação cidadã. O objetivo principal é analisar se o telejornal TVU Notícias contribui para a formação cidadã dos seus telespectadores, a partir das escolhas dos assuntos e da angulação das matérias exibidas no programa. Busca-se compreender os princípios, os conceitos e as práticas do jornalismo público, movimento formado por um grupo de jornalistas norte-americanos que pretendiam recuperar a ética e os princípios democráticos no processo de formulação de notícias. Pretende-se apresentar e analisar o jornalismo público como uma forma possível de desenvolver a cidadania e verificar se os conceitos que conduzem este tipo de jornalismo podem ser encontrados no jornalismo da televisão pública brasileira. Para consecução do objetivo deste trabalho, foi realizada pesquisa bibliográfica acerca do jornalismo público, da evolução do jornalismo, dos efeitos da mídia e do conceito de TV pública. Foi, também, realizada pesquisa empírica através da observação do processo de produção do programa, relacionando-se as matéria/pautas, revendo-se os arquivos dos textos das matérias, e para complementar o estudo assistiu-se os áudios das matérias gravados em mídia DVD. A análise envolveu 12 programas e 12 matérias veiculados no período de 2009 a 2014. Os resultados da pesquisa permitiram constatar que a amostra das notícias apresentadas no programa sugere que os assuntos agendados são, em sua maioria, de interesse público e valor social, mas carecem de mais contextualização, profundidade e pluralidade de fontes. A partir desses resultados e tendo como diretriz o papel e a função da TV pública, concluiu-se que para o TVU Notícias possa contribuir efetivamente para a formação de seus telespectadores precisa superar a superficialidade das matérias apresentadas, aproximando-se mais do jornalismo que se espera de uma TV pública.

Atitudes e conhecimento dos consumidores sobre os alimentos irradiados: um inquérito conduzido em Natal, Brasil

The aim of this study is to assess the attitudes and knowledge of consumers about irradiated foods. The study sample corresponded to 65.52% women and the mean age was 41.82 (SD: 14.33) years. Only 66.9% of respondents consumers consult the list of ingredients on the label of packaged foods, and 13.4% of them said they had detected the phrase “FOOD TREATED BY IRRADIATION PROCESS.” Furthermore, 86.6% considered that irradiation becomes unsafe food and thus 94.9% of those not consume these foods, as well as 29.6% of those who felt otherwise. Women had a score of attitude towards irradiated foods less favorable than men. The television was considered the most efficient means of communication to report on irradiated foods. We conclude that consumers of the city of Natal lack information about food irradiation and acceptance of these products depends on how the policies are directed to food security and health education, including through the use of sources of mass information dissemination. The information on the labels of irradiated foods is controversial, although sufficient instruments for detection of irradiated foods by these consumers.