46 research outputs found

    From MANET to people-centric networking: Milestones and open research challenges

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    In this paper, we discuss the state of the art of (mobile) multi-hop ad hoc networking with the aim to present the current status of the research activities and identify the consolidated research areas, with limited research opportunities, and the hot and emerging research areas for which further research is required. We start by briefly discussing the MANET paradigm, and why the research on MANET protocols is now a cold research topic. Then we analyze the active research areas. Specifically, after discussing the wireless-network technologies, we analyze four successful ad hoc networking paradigms, mesh networks, opportunistic networks, vehicular networks, and sensor networks that emerged from the MANET world. We also present an emerging research direction in the multi-hop ad hoc networking field: people centric networking, triggered by the increasing penetration of the smartphones in everyday life, which is generating a people-centric revolution in computing and communications

    Service Oriented Mobile Computing

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    La diffusione di concetti quali Pervasive e Mobile Computing introduce nell'ambito dei sistemi distribuiti due aspetti fondamentali: la mobilità dell'utente e l'interazione con l'ambiente circostante, favorite anche dal crescente utilizzo di dispositivi mobili dotati di connettività wireless come prodotti di consumo. Per estendere le funzionalità introdotte nell'ambito dei sistemi distribuiti dalle Architetture Orientate ai Servizi (SOA) e dal paradigma peer-to-peer anche a dispositivi dalle risorse limitate (in termini di capacità computazionale, memoria e batteria), è necessario disporre di un middleware leggero e progettato tenendo in considerazione tali caratteristiche. In questa tesi viene presentato NAM (Networked Autonomic Machine), un formalismo che descrive in modo esaustivo un sistema di questo tipo; si tratta di un modello teorico per la definizione di entità hardware e software in grado di condividere le proprie risorse in modo completamente altruistico. In particolare, il lavoro si concentra sulla definizione e gestione di un determinato tipo di risorse, i servizi, che possono essere offerti ed utilizzati da dispositivi mobili, mediante meccanismi di composizione e migrazione. NSAM (Networked Service-oriented Autonomic Machine) è una specializzazione di NAM per la condivisione di servizi in una rete peer-to-peer, ed è basato su tre concetti fondamentali: schemi di overlay, composizione dinamica di servizi e auto-configurazione dei peer. Nella tesi vengono presentate anche diverse attività applicative, che fanno riferimento all'utilizzo di due middleware sviluppati dal gruppo di Sistemi Distribuiti (DSG) dell'Università di Parma: SP2A (Service Oriented Peer-to-peer Architecture), framework per lo sviluppo di applicazioni distribuite attraverso la condivisione di risorse in una rete peer-to-peer, e Jxta-Soap che consente la condivisione di Web Services in una rete peer-to-peer JXTA. Le applicazioni realizzate spaziano dall'ambito della logistica, alla creazione di comunità per l'e-learning, all'Ambient Intelligence alla gestione delle emergenze, ed hanno come denominatore comune la creazione di reti eterogenee e la condivisione di risorse anche tra dispositivi mobili. Viene inoltre messo in evidenza come tali applicazioni possano essere ottimizzate mediante l'introduzione del framework NAM descritto, per consentire la condivisione di diversi tipi di risorse in modo efficiente e proattivo

    Revolutionizing history education : using augmented reality games to teach histories

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    Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Comparative Media Studies, 2005.Includes bibliographical references (leaves 154-162).In an ever-changing present of multiple truths and reconfigured histories, people need to be critical thinkers. Research has suggested the potential for using augmented reality (AR) games- location-based games that use wireless handheld devices to provide virtual game information in a physical environment-as educational tools. I designed "Reliving the Revolution" as a model for using AR games to teach historic inquiry, decision-making, and critical thinking skills. "Reliving the Revolution" takes place in Lexington, MA, the site of the Battle of Lexington (American Revolution) and simulates the activities of a historian, such as evidence collection and interpretation. Participants interact with virtual historic figures and gather virtual testimonials and evidence on the Battle, each triggered by GPS to appear on the handheld devices depending on one's specific location on or around the Lexington Common. The participants collect differing evidence based on their historic role in the game (Minuteman soldier, loyalist, African American/Minuteman soldier, or British soldier) and then collaboratively evaluate who fired the first shot to start the Battle of Lexington.(cont.) I envision "Reliving the Revolution" not as a standalone educational solution, but as an activity integrated into a broader history curriculum that teaches students how to approach and evaluate complex social problems. This thesis provides a detailed rationale for each of my design choices, as well as an assessment of each choice based on the results of iterative game testing. In my analysis of the game's design, I focus specifically on four game elements: (1) collaborative, (2) role-playing, (3) storytelling or narrative elements; and (4) kinesthetic and mobility. Results of trials of the game suggest that "Reliving the Revolution" and similar AR games can enhance the learning of: (1) historical name, places, and themes; (2) historical methodology and the limits to representations of the past; and (3) alternative perspectives and challenges to "master" historical interpretations. The game motivated participants to gather, evaluate, and interpret historical information, devise hypotheses and counter-arguments, and draw informed conclusions.(cont.) My trials also suggested that AR games such as "Reliving the Revolution" can enhance learning because it can: 1. Create an authentic "practice field" for solving problems and using real-world contexts and tools. 2. Increase the potential for collaboration among participants, and enhance opportunities for reflection. 3. Enable participants to take on and express new identities through role-playing. 4. Encourage participants to explore more deeply a physical site and to consider interactions between the real and virtual worlds.by Karen L. Schrier.S.M

    Immersive Telepresence: A framework for training and rehearsal in a postdigital age

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