WiPal: Efficient Offline Merging of IEEE 802.11 Traces

Merging wireless traces is a fundamental step in measurement-based studies involving multiple packet sniffers. Existing merging tools either require a wired infrastructure or are limited in their usability. We propose WiPal, an offline merging tool for IEEE 802.11 traces that has been designed to be efficient and simple to use. WiPal is flexible in the sense that it does not require any specific services, neither from monitors (like synchronization, access to a wired network, or embedding specific software) nor from its software environment (e.g. an SQL server). We present WiPal's operation and show how its features - notably, its modular design - improve both ease of use and efficiency. Experiments on real traces show that WiPal is an order of magnitude faster than other tools providing the same features. To our knowledge, WiPal is the only offline trace merger that can be used by the research community in a straightforward fashion.Comment: 6 page

Plausible Mobility: Inferring Movement from Contacts

We address the difficult question of inferring plausible node mobility based only on information from wireless contact traces. Working with mobility information allows richer protocol simulations, particularly in dense networks, but requires complex set-ups to measure, whereas contact information is easier to measure but only allows for simplistic simulation models. In a contact trace a lot of node movement information is irretrievably lost so the original positions and velocities are in general out of reach. We propose a fast heuristic algorithm, inspired by dynamic force-based graph drawing, capable of inferring a plausible movement from any contact trace, and evaluate it on both synthetic and real-life contact traces. Our results reveal that (i) the quality of the inferred mobility is directly linked to the precision of the measured contact trace, and (ii) the simple addition of appropriate anticipation forces between nodes leads to an accurate inferred mobility.Comment: 8 pages, 8 figures, 1 tabl

Using Neighborhood Beyond One Hop in Disruption-Tolerant Networks

Most disruption-tolerant networking (DTN) protocols available in the literature have focused on mere contact and intercontact characteristics to make forwarding decisions. Nevertheless, there is a world behind contacts: just because one node is not in contact with some potential destination, it does not mean that this node is alone. There may be interesting end-to-end transmission opportunities through other nearby nodes. Existing protocols miss such possibilities by maintaining a simple contact-based view of the network. In this paper, we investigate how the vicinity of a node evolves through time and whether such information can be useful when routing data. We observe a clear tradeoff between routing performance and the cost for monitoring the neighborhood. Our analyses suggest that limiting a node's neighborhood view to three or four hops is more than enough to significantly improve forwarding efficiency without incurring prohibitive overhead.Comment: 5 pages, 5 figures, 1 tabl

G Suite como solução em ferramentas de trabalho colaborativas, acadêmicas e profissionais

The wonders brought by innovations from cloud computing help collaborative productivity and work management processes, revolutionize the way we learn and work, mitigate boundaries, in addition to expanding services and reducing costs for companies and people globally. In this perspective, the objective of the present research is to present the G Suite functionalities as a productivity, storage and cooperation tool. In order to achieve the proposed objective, an investigation was carried out on the Google Docs application, understood as an essential tool in the creation, edition, management and sharing of office-type documents – office applications, which is part of the G Suite solution. This study was carried out exploring the Google Docs tool, as well as books, articles, websites, blogs and technical documents. The following was concluded, among other things: G Suite is a powerful and complex tool for productivity, storage and collaborative work, with Google Docs as its greatest exponent; the G Suite is the evolution of Google Apps, the latter representing free tools, including Google Docs; and, access to office type tools requires the user to have an active Gmail account.Las maravillas que traen las innovaciones de la computación en la nube ayudan a la productividad colaborativa y a los procesos de gestión del trabajo, revolucionan la forma en que aprendemos y trabajamos, mitigan los límites, además de ampliar los servicios y reducir los costos para las empresas y las personas a nivel mundial. En esta perspectiva, el objetivo de la presente investigación es presentar las funcionalidades de G Suite como una herramienta de productividad, almacenamiento y cooperación. Para lograr el objetivo propuesto, se llevó a cabo una investigación sobre la aplicación Google Docs, entendida como una herramienta esencial en la creación, edición, gestión y uso compartido de documentos de tipo office, aplicaciones de oficina, que forma parte de la solución G Suite. Este estudio se llevó a cabo explorando la herramienta Google Docs, así como libros, artículos, sitios web, blogs y documentos técnicos. Se concluyó lo siguiente, entre otras cosas: (1)G Suite es una herramienta poderosa y compleja para la productividad, el almacenamiento y el trabajo colaborativo, con Google Docs como su mayor exponente; (2)G Suite es la evolución de Google Apps, esta última representa herramientas gratuitas, incluidos Google Docs; y, (3)el acceso a las herramientas de tipo oficina requiere que el usuario tenga una cuenta de Gmail activa.As maravilhas trazidas pelas inovações a partir da computação em nuvem auxiliam nos processos de produtividade e gerenciamento de trabalho colaborativos, revolucionam a forma como aprendemos e trabalhamos, atenuam fronteiras, além de ampliarem os serviços e reduzirem custos para empresas e para pessoas à nível global. Nessa perspectiva, o objetivo da presente pesquisa é apresentar as funcionalidades do G Suite enquanto ferramenta de produtividade, de armazenamento e de cooperação. Para atingir o objetivo proposto, foi realizada uma investigação sobre o aplicativo Google Docs, entendido como ferramenta essencial na criação, na edição, no gerenciamento e no compartilhamento de documentos do tipo office – aplicativos de escritório, sendo este uma vertente da solução G Suite. Este estudo foi realizado explorando a ferramenta Google Docs, bem como livros, artigos, sites, blogs e documentos técnicos. Concluiu-se, entre outras coisas, o seguinte: (1)o G Suite é uma poderosa e uma complexa ferramenta de produtividade, de armazenamento e de trabalho colaborativo, tendo no Google Docs seu maior expoente; (2)o G Suite é a evolução do Google Apps, este último representante das ferramentas de caráter gratuito, incluindo o Google Docs; e, (3)o acesso às ferramentas tipo office exigem que o usuário tenha uma conta Gmail ativa