Video on demand (VoD) services are becoming more and more popular today. As high bandwidth communication infrastructure is being established in many countries around the world, high bandwidth communication lines will reach millions of family in the near future. Due to the increasing improvement of communication technology, more and more families enjoy the VoD services which are provided by telecommunication companies and cable TV provider via the Internet. In such a case, scalability and fault tolerance will be the key issues. We propose an architecture for VoD services which is based on multi-server circumstance. In our proposed architecture, each movie is replicated on a subset of the servers. When a server crashes or disconnects from its clients, it is replaced by another server in a transparent way. Regarding of load balancing problem, clients are also migrated from one server to another when a new server is brought up. The benefit of our service is to use common hardware and general network technologies (e.g. TCP/IP). In addition, we provide a machine-independent environment to let the servers and clients execute on any machine through the network. Furthermore, we can get the media players from a web browser by utilizing the cross-platform characteristics of Java. The client host does not need to install any relevant applications. Since Java Media Framework (JMF) provides a unified architecture and messaging protocol for managing the acquisition, processing, and delivery of time-based media data. It can support many standard media content types, such as AIFF, AVI, MIDI, MPEG, QuickTime, and WAV. Using JMF, we can create applets and applications to present, manipulate, and store time-based media.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-04-26T15:18:35Z No. of bitstreams: 1 talitalucarellimoreira.pdf: 1298986 bytes, checksum: f34a21b456528506c0f4d813673e06de (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-05-02T00:53:08Z (GMT) No. of bitstreams: 1 talitalucarellimoreira.pdf: 1298986 bytes, checksum: f34a21b456528506c0f4d813673e06de (MD5) / Made available in DSpace on 2016-05-02T00:53:08Z (GMT). No. of bitstreams: 1 talitalucarellimoreira.pdf: 1298986 bytes, checksum: f34a21b456528506c0f4d813673e06de (MD5) Previous issue date: 2016-02-25 / Propõe-se neste trabalho uma análise da cobertura das Manifestações de Junho de 2013 no jornal Folha de S. Paulo e nos programas televisivos do Horário Gratuito de Propaganda Eleitoral (HGPE) de 2014. Parte-se da hipótese de que, considerando o poder de mobilização dos eventos ocorridos em junho de 2013, estes ganhariam destaque tanto na cobertura jornalística quando no discurso apresentado pelos presidenciáveis no HGPE. Tomando como recorte as publicações referentes às manifestações veiculadas nas capas da Folha de S. Paulo, no período de 07 a 21 de junho, identificam-se, por meio da Análise de Conteúdo (BARDIN, 1977), os enquadramentos noticiosos pelos quais os fatos se tornaram notícia, a partir da perspectiva construcionista que norteia os estudos recentes das teorias do jornalismo. No que diz respeito ao HGPE, foram analisadas as peças veiculadas pelos quatro principais candidatos à presidência, Dilma Rousseff (PT), Aécio Neves (PSDB), Marina Silva (PSB) e Luciana Genro (PSOL). Verifica-se de que forma cada um dos presidenciáveis se apropriou da temática relativa às manifestações e em que medida elas estiveram presentes nos discursos destes atores, tendo a Análise de Conteúdo categorial como suporte metodológico. Para que seja possível perceber as relações entre a comunicação e a política, são estabelecidos diálogos entre autores que trabalham a interseção entre estes dois campos, percebendo as atuações da mídia como palco de disputas simbólicas e, ao mesmo tempo, como ator social e político. A partir dos dados coletados e analisados neste trabalho, foi possível observar que a Folha produziu enquadramentos que retratavam as manifestações sob vieses predominantemente negativos, enquanto os principais presidenciáveis envolvidos na disputa eleitoral utilizaram-se do HGPE para produzir retóricas de campanha através das quais as jornadas de junho foram apropriadas a partir do perfil ideológico de cada um dos candidatos. / In this thesis we make a coverage analysis of the 2013 June manifestations focusing on the newspaper Folha de S. Paulo and the television programs of the 2014 HGPE. Starting with the hypothesis that, considering the power of mobilizing the events occurred in 2013 June, they are able to gain prominence both in the news coverage and in the speech of presidential candidates debate on the HGPE. We will take as a sample the publications about the manifestations conveyed on the Folha de S. Paulo covers between 07 and 21 of June. Using as basis the Bardin (1977) methods of categorical content analysis, we intend to identify the media framework on the facts departing from the constructionist perspective that leads the recent journalism studies. On the HGPE we analyzed the programs broadcasted by the four main candidates: Dilma Rousseff (PT), Aécio Neves (PSDB), Marina Silva (PSB) e Luciana Genro (PSOL). We want to verify the way the presidential candidates appropriated the discourse the thematic related to the manifestations and in what sense they were present in it using the categorical content analysis as a methodological support. To be able to measure the relations between communication and politics we will establish dialogues among the authors that discuss the relation of the two fields and highlighted the symbolic actuations of the media on the disputes not just as a stage in the political scene but as an active part of it. From the data collected and analyzed in this study it was observed that Folha produced frameworks that portrayed the demonstrations in predominantly negative bias, while the main presidential candidates involved in the electoral race we used the HGPE to produce campaign rhetoric through which journeys june were appropriate from the ideological profile of each candidate.

Master’s thesis is trying to create opensource IM application for communication in Jabber network. In nowadays it is getting more and more popularity as at providers, so mainly at end users. In first half of thesis are explained basics of whole issues and in second half is described resulting application, which has been created by using of object oriented programming language Java. Java is very extended between programmers for her simplicity and great support. Thanks this is available a many external libraries and extensions. Application has been written on Smack library in version 3.04 and VoIP module on JMF (Java Media Framework). Graphic interface has been created by using of standard Java visual components (javax.swing).

The main goal of this thesis is to design videoconferential system by Java Media Framework. This means to write two programs. One will capture multimedia data from webcam and will sent it into network. The second application which can receive this data is supposed to be on another computer. The multimedia data are transmitted by using Java Media Framework library. We suppose one lector and group of students. Video and audio channel is transmitted to all students. Communication between lector and student  is solved using chat. Lector has possibility open another audio or video channel with all students. Multimedia data will be transferred using Real-time Transport Protocol (RTP). The message including information about student is transferred by Transmission Control Protocol (TCP).

Com a rápida evolução tecnológica e o crescimento da aplicação de novas tecnologias digitais na educação - em especial em cursos a distância - o mais importante tem sido a criação de novos ambientes de aprendizagem que estimulam a interatividade, desenvolvem a capacidade de formular, de resolver questões e, acima de tudo, possibilitam a participação de forma colaborativa, embora estando fisicamente distante. A idéia de uma escola \"expandida\" visa atender a diversas áreas de ensino, entre elas a necessidade de treinamentos no setor corporativo para os profissionais que já estão no mercado de trabalho, a formação escolar para jovens e adultos que enfrentam dificuldades pela distância ou indisponibilidade de horário, ou mesmo a qualificação docente em grande demanda por aperfeiçoamento. Para atingir um nível bom de participação em encontros virtuais, faz-se necessário contar com tecnologias de comunicação e informação que medeiam a interação entre os envolvidos no processo de ensino. Afinal, a aprendizagem, que não é apenas individual mas coletiva, se baseia na convivência entre os participantes, na troca de informações entre eles. Quando um conteúdo é ministrado a distância, por meio da Internet, em videoconferência, permite-se criar um espaço ideal para uma colaboração distribuída. Por conta dessa necessidade, este trabalho apresenta um ambiente que oferece a comunicação por vídeo, voz e texto, para aulas ao vivo entre vários participantes, cuja participação é controlada pelo moderador, ao mesmo tempo em que conta com um sistema de registro de atividades para interação assíncrona. Além do ambiente desenvolvido, o trabalho introduz um breve estudo de conceitos envolvidos na videoconferência, as tecnologias disponíveis, bem como as utilizadas para o desenvolvimento deste projeto. Alguns resultados foram obtidos após realização de testes e utilização do ambiente, tal como a análise de desempenho a partir dos recursos disponíveis na rede. / With the fast technological evolution and the growth of the new digital technologies application in the education, in special in long-distance education courses is observed that the majority of these courses has favored great parcel of people. The most important it has been the creation of new learning environment that stimulates the participation, developing the capacity to formulate, to decide questions and all above of everything participating in a collaborative way. The idea of a expanded school aims at to take care of diverse areas of education, between them the necessity of training in the corporative sector for the professionals who already are in the work market, the formation pertaining to school for young and adult that faces difficulties for the distance or non-availability of schedule or the teaching qualification in great demand for perfectioning. A learning that is not only individual, but collective, is basead on the relationship between the participants, in the exchange of information between them. Therefore, in the long-distance education makes necessary the communication technologies and information that measured the interaction between the involved education process. When a content is given in the distance, by means of the Internet, video conferencing and video lessons, is allowed to create an ideal space for the distributed contribution. For this necessity, this work show an environment for lessons live between some participants, that offers the communication by video, voice and text. The participation is controlled by moderator, being able to be a professor or the person that give a lecture. Contains also a system of register of activities for asynchronous interaction. Beyond the developed environment, the work introduces a briefing study of involved concepts in the video conferencing, the available technologies, as well as the used ones for the development of this project. Some results had been gotten after accomplishment of tests, allowing to verify different performances depending on the available resources in the net.

Com a rápida evolução tecnológica e o crescimento da aplicação de novas tecnologias digitais na educação - em especial em cursos a distância - o mais importante tem sido a criação de novos ambientes de aprendizagem que estimulam a interatividade, desenvolvem a capacidade de formular, de resolver questões e, acima de tudo, possibilitam a participação de forma colaborativa, embora estando fisicamente distante. A idéia de uma escola \"expandida\" visa atender a diversas áreas de ensino, entre elas a necessidade de treinamentos no setor corporativo para os profissionais que já estão no mercado de trabalho, a formação escolar para jovens e adultos que enfrentam dificuldades pela distância ou indisponibilidade de horário, ou mesmo a qualificação docente em grande demanda por aperfeiçoamento. Para atingir um nível bom de participação em encontros virtuais, faz-se necessário contar com tecnologias de comunicação e informação que medeiam a interação entre os envolvidos no processo de ensino. Afinal, a aprendizagem, que não é apenas individual mas coletiva, se baseia na convivência entre os participantes, na troca de informações entre eles. Quando um conteúdo é ministrado a distância, por meio da Internet, em videoconferência, permite-se criar um espaço ideal para uma colaboração distribuída. Por conta dessa necessidade, este trabalho apresenta um ambiente que oferece a comunicação por vídeo, voz e texto, para aulas ao vivo entre vários participantes, cuja participação é controlada pelo moderador, ao mesmo tempo em que conta com um sistema de registro de atividades para interação assíncrona. Além do ambiente desenvolvido, o trabalho introduz um breve estudo de conceitos envolvidos na videoconferência, as tecnologias disponíveis, bem como as utilizadas para o desenvolvimento deste projeto. Alguns resultados foram obtidos após realização de testes e utilização do ambiente, tal como a análise de desempenho a partir dos recursos disponíveis na rede. / With the fast technological evolution and the growth of the new digital technologies application in the education, in special in long-distance education courses is observed that the majority of these courses has favored great parcel of people. The most important it has been the creation of new learning environment that stimulates the participation, developing the capacity to formulate, to decide questions and all above of everything participating in a collaborative way. The idea of a expanded school aims at to take care of diverse areas of education, between them the necessity of training in the corporative sector for the professionals who already are in the work market, the formation pertaining to school for young and adult that faces difficulties for the distance or non-availability of schedule or the teaching qualification in great demand for perfectioning. A learning that is not only individual, but collective, is basead on the relationship between the participants, in the exchange of information between them. Therefore, in the long-distance education makes necessary the communication technologies and information that measured the interaction between the involved education process. When a content is given in the distance, by means of the Internet, video conferencing and video lessons, is allowed to create an ideal space for the distributed contribution. For this necessity, this work show an environment for lessons live between some participants, that offers the communication by video, voice and text. The participation is controlled by moderator, being able to be a professor or the person that give a lecture. Contains also a system of register of activities for asynchronous interaction. Beyond the developed environment, the work introduces a briefing study of involved concepts in the video conferencing, the available technologies, as well as the used ones for the development of this project. Some results had been gotten after accomplishment of tests, allowing to verify different performances depending on the available resources in the net.

<p>The last ten years have been the witnesses of the emergence of any kind of video content. Moreover, the appearance of dedicated websites for this phenomenon has increased the importance the public gives to it. In the same time, certain individuals are deaf and occasionally cannot understand the meanings of such videos because there is not any text transcription available. Therefore, it is necessary to find solutions for the purpose of making these media artefacts accessible for most people. Several software propose utilities to create subtitles for videos but all require an extensive participation of the user. Thence, a more automated concept is envisaged. This thesis report indicates a way to generate subtitles following standards by using speech recognition. Three parts are distinguished. The first one consists in separating audio from video and converting the audio in suitable format if necessary. The second phase proceeds to the recognition of speech contained in the audio. The ultimate stage generates a subtitle file from the recognition results of the previous step. Directions of implementation have been proposed for the three distinct modules. The experiment results have not done enough satisfaction and adjustments have to be realized for further work. Decoding parallelization, use of well trained models, and punctuation insertion are some of the improvements to be done.</p>

The last ten years have been the witnesses of the emergence of any kind of video content. Moreover, the appearance of dedicated websites for this phenomenon has increased the importance the public gives to it. In the same time, certain individuals are deaf and occasionally cannot understand the meanings of such videos because there is not any text transcription available. Therefore, it is necessary to find solutions for the purpose of making these media artefacts accessible for most people. Several software propose utilities to create subtitles for videos but all require an extensive participation of the user. Thence, a more automated concept is envisaged. This thesis report indicates a way to generate subtitles following standards by using speech recognition. Three parts are distinguished. The first one consists in separating audio from video and converting the audio in suitable format if necessary. The second phase proceeds to the recognition of speech contained in the audio. The ultimate stage generates a subtitle file from the recognition results of the previous step. Directions of implementation have been proposed for the three distinct modules. The experiment results have not done enough satisfaction and adjustments have to be realized for further work. Decoding parallelization, use of well trained models, and punctuation insertion are some of the improvements to be done.