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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

Building Blocks for Tomorrow's Mobile App Store

Manweiler, Justin Gregory January 2012 (has links)
<p>In our homes and in the enterprise, in our leisure and in our professions, mobile computing is no longer merely "exciting;" it is becoming an essential, ubiquitous tool of the modern world. New and innovative mobile applications continue to inform, entertain, and surprise users. But, to make the daily use of mobile technologies more gratifying and worthwhile, we must move forward with new levels of sophistication. The Mobile App Stores of the future must be built on stronger foundations. </p><p>This dissertation considers a broad view of the challenges and intuitions behind a diverse selection of such new primitives. Some of these primitives will mitigate existing and fundamental challenges of mobile computing, especially relating to wireless communication. Others will take an application-driven approach, being designed to serve a novel purpose, and be adapted to the unique and varied challenges from their disparate domains. However, all are related through a unifying goal, to provide a seamless, enjoyable, and productive mobile experience. This dissertation takes view that by bringing together nontrivial enhancements across a selection of disparate-but-interrelated domains, the impact is synergistically stronger than the sum of each in isolation. Through their collective impact, these new "building blocks" can help lay a foundation to upgrade mobile technology beyond the expectations of early-adopters, and into seamless integration with all of our lives.</p> / Dissertation
92

A Power Saving Mechanism for Web Traffic in IEEE 802.11 Wireless LAN

Jiang, Jyum-Hao 26 July 2010 (has links)
Web browsing via Wi-Fi wireless access networks has become a basic function on a variety of consumer mobile electronic devices, such as smart phones, PDAs, and the Apple iPad. It has been found that in terms of energy consumption, wireless communications/networking plays an important role in mobile devices. Since the power-saving mode (PSM) of the IEEE 802.11 a/b/g standard is not tailored for the HTTP protocol, we propose a novel power saving scheme that exploits the characteristics of web applications. After sending HTTP requests, the proposed power saving scheme updates the estimated value of RTT based on the information contained in the TCP timestamp header field. Next, the proposed scheme adjusts the value of the listening period based on the estimated value of RTT. When all TCP connections have been closed, the wireless network card could enter the deep-sleeping mode. In this case, the value of the listening period could be larger than one second, since the user is reading the webpage and is unlikely to send another HTTP request within one second. The usage of the deep-sleeping mode can significantly reduce the power consumption of mobile devices.
93

A Modified Distributed Coordination Function for Real-Time Traffic in IEEE 802.11 WLAN

Lin, An-Tai 01 September 2003 (has links)
The Distributed Coordination Function (DCF) which uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) and binary slotted exponential backoff scheme is the basis of the IEEE 802.11 Medium Access Control (MAC) protocol. However, the DCF is not suitable for real-time traffic control since the backoff scheme may cause huge frame delay and jitter. We propose a modified DCF which uses a forward backoff scheme to remedy this disadvantage. In addition, a call admission control (CAC) is also proposed. Our protocol can guarantee service qualities such as the network throughput, frame delay, and jitter for real-time traffics. Besides, the modified DCF is still compliant with the IEEE 802.11 standard. Simulation results have shown that our method performs better than other DCF disciplines.
94

Optimisation du Handover dans le protocole IPv6 mobile avec la méthode E-HCF

Wei, Guozhi Dupeyrat, Gérard Wei-Liu, Anne January 2008 (has links) (PDF)
Thèse de doctorat : Sciences informatiques : Paris Est : 2008. / Titre provenant de l'écran-titre.
95

Simulation de la propagation des ondes radio en environnement multi-trajets pour l'étude des réseaux sans fil

La Roche, Guillaume de Gorce, Jean-Marie Ubéda, Stéphane. January 2008 (has links)
Thèse doctorat : Télécommunications : Villeurbanne, INSA : 2007. / Titre provenant de l'écran-titre. Bibliogr. p. 180-192.
96

Gestion dynamique des topologies sans fils

Jabri, Issam Divoux, Thierry. Nasri, Salem. January 2008 (has links) (PDF)
Thèse de doctorat : Automatique, Traitement du Signal et Génie Informatique : Nancy 1 : 2008. Thèse de doctorat : Automatique, Traitement du Signal et Génie Informatique : Ecole Nationale d'Ingénieurs de Sfax : 2008. / Thèse soutenue en co-tutelle. Titre provenant de l'écran-titre.
97

Modélisation analytique et contrôle d'admission dans les réseaux 802.11e pour une maîtrise de la Qualité de Service

Taher, Nada Agoulmine, Nazim January 2009 (has links) (PDF)
Thèse de doctorat : Informatique : Evry-Val d'Essonne : 2009. / Titre provenant de l'écran-titre.
98

Session hijacking attacks in wireless local area networks /

Onder, Hulusi. January 2004 (has links) (PDF)
Thesis (M.S. in Computer Science)--Naval Postgraduate School, March 2004. / Thesis advisor(s): Geoffrey Xie. Includes bibliographical references (p. 131-132). Also available online.
99

Performance analysis of M-QAM with Viterbi soft-decision decoding /

Manso, Rogerio C. January 2003 (has links) (PDF)
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, March 2003. / Thesis advisor(s): Tri T. Ha, Jan E. Tighe. Includes bibliographical references (p. 105). Also available online.
100

CloudMAC Frame Prioritization : QoS and routing of IEEE802.11 frames in a Opendaylight controlled network / CloudMAC Ram Prioritering : Prioritering and dirigering av IEEE802.11 ramar i ett OpenDaylight kontrolleratnätverk

Joakim, Carlsson January 2015 (has links)
Wireless networks are common in large organisations that can cover multiple floors and buildings. Wireless networks become expensive as they grow and more control and coordination is needed to operate and management them. This thesis describes how CloudMAC, a software defined networking solution (SDN), were implemented in OpenDaylight Hydrogen, a SDN controller. CloudMAC reduces complexity in large wireless local area networks. CloudMAC splits access points (AP) into, a physical (accesses the wireless medium) and a logical (handles the processing of data) part. These two part are then placed in different locations in a wired network. The parts are connected by making tunnels through the network. Some of the communications in wireless networks are time sensitive. Such time sensitive communication is easily disturbed during congestion. To improve CloudMAC, quality of service (QoS) was implemented. QoS was used both in the wired network and in accessing the wireless medium. Evaluations shows how to evaluate queues utilization and performance.

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