Visualização de mobilidade e multihoming em redes sem fios

Engenharia Eletrónica e TelecomunicaçõesNos últimos anos, as pessoas têm-se tornado cada vez mais dependentes do uso de dispositivos móveis pessoais. Desta forma, tornouse indispensável fornecer acesso à Internet aos dispositivos dos utilizadores, em qualquer lugar e em qualquer altura. Estes utilizadores estão em constante movimento, logo a mobilidade apresenta um fator chave nas comunicações nos dias de hoje. A utilização de Hostmultihoming permite que os dispositivos dos utilizadores, que possuam várias interfaces de rede, passam estar ligados simultaneamente a várias redes de acesso. Com esta abordagem é possível aproveitar melhor os recursos que se encontram ao alcance do utilizador e fornecer uma ligação mais fiável. Com a integração de mobilidade e multihoming em redes sem fios é possível satisfazer as exigências cada vez mais elevadas dos utilizadores e oferecer uma melhor experiência de utilização. Com estes mecanismos implementados na rede é agora importante apresentar as suas características e funcionalidades. A forma mais intuitiva e interessante de perceber as mudanças que ocorrem na rede é através de uma plataforma de visualização. Para demonstrar as funcionalidades é necessário interagir com os nós da rede e despoletar remotamente eventos na rede. Estes eventos também devem ser visualizados de modo a perceber as mudanças que ocorrem na rede. O objetivo desta dissertação é desenvolver uma plataforma de visualização capaz de visualizar mobilidade e multihoming na rede, e interagir com a rede para despoletar remotamente eventos na mesma. Para atingir este objetivo, desenvolveu-se e integrou-se uma framework num protocolo de mobilidade com suporte para multihoming. De forma a demonstrar as funcionalidades da plataforma desenvolvida, implementaram-se duas testbeds em ambiente laboratorial, e de seguida realizaram-se testes para verificar as funcionalidades implementadas e o seu desempenho.In the last years we have witnessed that people are becoming increasingly dependent on the use of personal mobile devices. Providing Internet access to users’ devices while maintaining Quality-of-service has become indispensable. The users are constantly moving, and mobility presents a key factor in today’s communications. Host-multihoming allows end-user devices equipped with multiple network interfaces to be simultaneously connected to multiple access networks. This can optimally leverage the resources that are in the range of the end-user device and provide a greater sense of connection reliability. Implementing both mobility and multihoming in wireless networks can accommodate the increasing demands of the users and provide better user experience and network utilization. When these mechanisms are implemented in the network, it is important to present their features and demonstrate their functionalities. Visualization provides an intuitive and interesting way of understanding the changes that occur in the network. In order to demonstrate the functionalities, it is necessary to interact with the network nodes and remotely trigger network actions. These actions should also be visualized to understand the changes that happened in the network. The objective of this Dissertation is to develop a visualization platform able both to visualize mobility and multihoming in the network, and interact with the network to remotely trigger network actions. For this purpose, a framework has been developed and integrated in a mobility protocol with multihoming support. To demonstrate the functionalities of the developed platform, a testbed has been deployed in the laboratory environment and tests were performed to verify the implemented functionalities and evaluate its performance. The results show that the platform is able to visualize both mobility and multihoming in real-time. Also, the platform can interact with the network nodes in order to trigger network related actions, and visualize the result of these actions

A visual multivariate dynamic egocentric network exploration tool

Visualizing multivariate dynamic networks is a challenging task. The evolution of the dynamic network within the temporal axis must be depicted in conjunction with the associated multivariate attributes. In this thesis, an exploratory visual analytics tool is proposed to display multivariate dynamic networks with spatial attributes. The proposed tool displays the distribution of multivariate temporal domain and network attributes in scattered views. Moreover, in order to expose the evolution of a single or a group of nodes in the dynamic network along the temporal axis, an egocentric approach is applied in which a node is represented with its neighborhood as an ego-network. This approach allows users to observe a node's surrounding environment along the temporal axis. On top of the traditional ego-network visualization methods, such as timelines, the proposed tool encodes ego-networks as feature vectors consisting of the domain and network attributes and projects them onto 2D views. As a result, distances between projected ego-networks represent the dissimilarity across temporal axis in a single view. The proposed tool is demonstrated with a real-world use case scenario on merchant networks obtained from a one-year long credit card transaction

GRRASP version 3.1 User Manual

This report is a comprehensive manual for GRRASP including also a detailed description of the installation procedure. The user manual describes the main functionalities of GRRASP as well as how the end user can apply the models included in GRRASP. This software platform is evolving so this manual is a living document which will be updated on the basis of new functionalities.JRC.E.2-Technology Innovation in Securit