ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada / In NGN, the open interfaces and the IP protocol make the hazard of security aspect increased accordingly. Thereby, it is a very important premise for NGN network operation to afford a good secure media stream communication. In this paper, we will present a secure media stream communication for NGN. Then we will discuss the three parts of the media stream secure communication——media stream source authentication, secret key negotiation and distribution; media stream encryption/decryption in detail. It can effectively realize media stream end-to-end secure communication. Meanwhile, it also makes use of the expanding of former protocol during the secret key negotiation process.

Social Media Streams allow users to share user-generated content as well as aggregate different streams into one single stream. Additional Enterprise Social Media Streams organize the stream messages into projects with different usage patterns compared to public collaboration platforms such as Twitter. The aggregated stream helps the user to access the information in one single place but also leads to an information overload. Here, a recommendation engine can help to distinguish between relevant and irrelevant information for the users. In previous work we showed how features inferred from messages can predict relevant information and can be used to learn a user model. In this paper we show how this approach can be used in a productive enterprise social media stream application without using explicit user feedback. We develop a time binned evaluation measure which suits the scenario to steadily recommend messages of the stream. Finally, we evaluate our algorithm in different variations and show that it helps to identify relevant messages.

A grande evolução nos sistemas de comunicação, relacionados à transmissão de conteúdo multimídia nas redes de comunicação de dados e de transmissão de TV, demanda soluções de gerência da qualidade de serviço fim-a-fim. Diante deste cenário é proposta nesse trabalho a definição, implementação e validação de uma solução para monitoramento de transmissão de mídia que permite ser aplicada em arquiteturas de redes heterogêneas. Essas redes possuem a característica de integrar diversas tecnologias de redes de comunicação de dados e de telecomunicações, envolvendo redes modernas e antigas, padronizadas e proprietárias. Este trabalho apresenta um sistema de monitoramento para transmissão de TV Digital em ambientes heterogêneos convergentes, isto é, redes que utilizam tecnologias e meios de transmissão distintos para transmissão de vários tipos de fluxos, e com foco na aplicação TV Digital. Para isso, são discutidos aspectos fundamentais para o monitoramento de fluxo de TV Digital neste tipo de rede e é feita uma análise da comunicação entre os subsistemas do ambiente. O sistema de monitoramento possui uma arquitetura definida que se baseia no protocolo RTP Real-time Transport Protocol, para suportar a transmissão de mídias, como áudio e vídeo, em redes heterogêneas. A fim de validar esta arquitetura foi implementado um protótipo, como prova de conceito, que obtém dados através da base de informações de gerência (MIB) RTP. Os resultados gerados pelo protótipo consolidam informações relativas à variação de atraso em uma interface web de gerenciamento através de monitores distribuídos pela rede. / The great evolution in the telecommunication systems related to the transmission of multimidia contents in the data communication networks and TV transmission, demands management solutions in which regards quality of end-to-end services. Taking this scenario into consideration, it is proposed in this work the definition and implementation of a solution to monitor media transmition that can be applied to heterogeneous network architectures. The feature of such networks is to integrate different data communication network technologies and telecommunication, involving legacy and modern networks, standarized and proprietary. This work presents a monitoring system for digital TV transmission in heterogeneous converging environments, that is, networks that use different technologies and transmission means for the Digital TV application. Therefore, key aspects for monitoring the digital TV flow in this kind of network are pointed out, as well as an analysis of the communication among the environment subsystems. The monitoring system has a defined architecture, based on the RTP Real-time Transport Protocol, to support the media transmission, such as audio and video, in heterogeneous networks. In order to validate this architecture, a prototype was implemented, as concept evidence, that obtains data from the management information base (MIB) RTP. The results generated by the prototype consolidate information related to the delay variation (jitter) in a management web interface through monitors distributed around the network.

A grande evolução nos sistemas de comunicação, relacionados à transmissão de conteúdo multimídia nas redes de comunicação de dados e de transmissão de TV, demanda soluções de gerência da qualidade de serviço fim-a-fim. Diante deste cenário é proposta nesse trabalho a definição, implementação e validação de uma solução para monitoramento de transmissão de mídia que permite ser aplicada em arquiteturas de redes heterogêneas. Essas redes possuem a característica de integrar diversas tecnologias de redes de comunicação de dados e de telecomunicações, envolvendo redes modernas e antigas, padronizadas e proprietárias. Este trabalho apresenta um sistema de monitoramento para transmissão de TV Digital em ambientes heterogêneos convergentes, isto é, redes que utilizam tecnologias e meios de transmissão distintos para transmissão de vários tipos de fluxos, e com foco na aplicação TV Digital. Para isso, são discutidos aspectos fundamentais para o monitoramento de fluxo de TV Digital neste tipo de rede e é feita uma análise da comunicação entre os subsistemas do ambiente. O sistema de monitoramento possui uma arquitetura definida que se baseia no protocolo RTP Real-time Transport Protocol, para suportar a transmissão de mídias, como áudio e vídeo, em redes heterogêneas. A fim de validar esta arquitetura foi implementado um protótipo, como prova de conceito, que obtém dados através da base de informações de gerência (MIB) RTP. Os resultados gerados pelo protótipo consolidam informações relativas à variação de atraso em uma interface web de gerenciamento através de monitores distribuídos pela rede. / The great evolution in the telecommunication systems related to the transmission of multimidia contents in the data communication networks and TV transmission, demands management solutions in which regards quality of end-to-end services. Taking this scenario into consideration, it is proposed in this work the definition and implementation of a solution to monitor media transmition that can be applied to heterogeneous network architectures. The feature of such networks is to integrate different data communication network technologies and telecommunication, involving legacy and modern networks, standarized and proprietary. This work presents a monitoring system for digital TV transmission in heterogeneous converging environments, that is, networks that use different technologies and transmission means for the Digital TV application. Therefore, key aspects for monitoring the digital TV flow in this kind of network are pointed out, as well as an analysis of the communication among the environment subsystems. The monitoring system has a defined architecture, based on the RTP Real-time Transport Protocol, to support the media transmission, such as audio and video, in heterogeneous networks. In order to validate this architecture, a prototype was implemented, as concept evidence, that obtains data from the management information base (MIB) RTP. The results generated by the prototype consolidate information related to the delay variation (jitter) in a management web interface through monitors distributed around the network.

Social Media Streams allow users to share user-generated content as well as aggregate different streams into one single stream. Additional Enterprise Social Media Streams organize the stream messages into projects with different usage patterns compared to public collaboration platforms such as Twitter. The aggregated stream helps the user to access the information in one single place but also leads to an information overload. Here, a recommendation engine can help to distinguish between relevant and irrelevant information for the users. In previous work we showed how features inferred from messages can predict relevant information and can be used to learn a user model. In this paper we show how this approach can be used in a productive enterprise social media stream application without using explicit user feedback. We develop a time binned evaluation measure which suits the scenario to steadily recommend messages of the stream. Finally, we evaluate our algorithm in different variations and show that it helps to identify relevant messages.