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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.

Deployment & scheduling in Wimax with relays : IEEE802.16j / Déploiement et ordonnancement dans Wimax avec relais : IEEE802.16j

Nguyen, Hai Dang 01 July 2011 (has links)
WiMAX mobile cellulaire systèmes ont pour objective de fournir des services multimédias à haut débit à n'importe quel moment, n'importe quel endroit avec un prix abordable. La combinaison d'orthogonale accès multiples (OFDMA) et le relais en Wimax donnent plusieurs opportunités pour des réseaux moins coûteux et plus performances. La norme Wimax 802.16j élargit non seulement la couverture de la cellule, mais aussi augmente le débit moyen des utilisateurs. Plusieurs recherches de cette norme ont été publiées afin d'optimiser la performance du réseau. Cependant, lorsque nous étudions les architectures existantes du Wimax 802.16j standard et leur rendement, nous nous sommes aperçus que le débit du système pourrait être encore amélioré à l'aide de la réutilisation de fréquence. Dans la première partie de ce travail de recherche, nous avons examiné l'architecture existante de la norme 802.16j. Le débit total du système est légèrement plus élevé dans ces architectures que dans la norme sans relais. Afin d'améliorer le rendement du système de cette norme, nous avons proposé une nouvelle architecture de cette norme avec réutilisation de fréquence et de la technique de sectorisation. Le débit total augmente fortement dans notre approche comparant aux études existantes. Dans la deuxième partie, nous avons étudié l'impact de l'interférence dans notre modèle de relais. Les résultats de simulation montrent que les SINR de station mobile augmentent très légèrement. Cet impact d’interférence est assez faible et pourrait être négligeable. Nous concluons que notre proposition fournit toujours une meilleure performance. Dans la troisième partie, nous avons proposé une nouvelle approche d’allocation de ressources en liaison descendante afin de garantir les mêmes qualités de service pour les utilisateurs en maintenant un haut débit total. Les résultats de simulation montrent qu'il existe un compromis entre l'équité de la qualité de service et le débit total du système. / Wimax mobile cellular systems are envisioned to provide high data rate multimedia services to users at anytime, anywhere at an affordable cost. The combination of orthogonal division multiple accesses (OFDMA) and relaying in Wimax provide rich opportunities for cost-effective and high performance networks. Wimax standard 802.16j extends not only the coverage of the cell but also increases the average throughput of the users. Much research of this standard has been published in order to optimize the performance of this network. However, when we reviewed the existing architectures of Wimax standard 802.16j and assessed their performance, we realized that the throughput of the system could still be enhanced by using a more efficient frequency reuse and scheduling algorithm. In the first part of the thesis, we review the existing standard 802.16j architectures in which the total throughput of system is slightly higher than that in the standard without relay one. To enhance even more the system performance of this standard, we propose a new architecture built on frequency reuse and sectoring technique. The total throughput increased strongly in our approach compared with to the existing studies. In the second part of the thesis, we study the impact of interference in our relay model. The simulation results showed that the SINR of mobile stations in our approach increase very slightly comparing to the one in Wimax with relay without frequency reuse and sectoring. Therefore the impact of interference is small and can be considered as negligible. We concluded that our proposition still provide a better performance. In the third part of the thesis, we proposed a new radio resource management approach in downlink in order to guarantee the user’s fairness but still maintain a high total throughput. The simulation results showed that there was a trade-off between the fairness-aware and the total throughput of the system.

Towards Taxonomizing of Core Software Handover Activities

Khan, Ahmad Salman, Kajko-Mattsson, Mira, Shahid, Muhammad Imran January 2010 (has links)
Handover is an essential component in the total lifecycle management of software systems. Despite this, the software community has not agreed on its basic activities and concepts yet.  In this paper, we evaluate a preliminary version of EM3 taxonomy of handover activities. Our goal is to evaluate its credibility in an industrial setting and find feedback for creating a transition process.  The evaluation is made in the context of an in-house handover process. / QC 20120221

Device Deployment Strategies for Large-scale Wireless Sensor Networks

Xu, Kenan 16 January 2008 (has links)
Planning device deployment is a fundamental issue in implementing wireless sensor network (WSN) applications. This design practice determines types, numbers and locations of devices in order to build a powerful and effective system using devices of limited energy supply and constrained capacities. The deployment plan decides the limits of many intrinsic properties of a WSN, such as coverage, connectivity, cost, and lifetime. In this thesis, we address the device deployment planning issues related to large-scale WSN systems. We consider a typical deployment planning scenario in a heterogeneous two-tier WSN composed of sensor nodes and relay nodes. Sensor nodes form the lower tier of the network and are responsible for providing satisfactory sensing coverage to the application. Relay nodes form the upper tier of the network and they are responsible for forwarding data from sensor nodes to the base station. As so, relay nodes should provide reliable connectivity to sensor nodes for an extended period of time. We therefore address the sensor node deployment in terms of the sensing coverage and relay node deployment in terms of the communication connectivity and system lifetime. For sensor node deployment, we propose a coverage-guaranteed sensor node deployment design technique. Using this technique, the sensing coverage is complete even if sensor nodes are randomly dispersed within a bounded range from its target locations according to a given grid pattern. In order to curb the increased cost due to extra sensor nodes that are used in the coverage-guaranteed deployment, while still maintaining a high-quality sensing coverage, we further study the probabilistic properties of the grid-based sensor node deployment in the presence of deployment errors. For relay node deployment, we propose to extend the system lifetime by distributing relay nodes according to a density function, which is optimized in response to the energy consumption rate, so that the energy is dissipated at an approximately same rate across the network. We further craft the deployment density function to reconcile the needs of balanced energy consumption and strong sensor node connectivity. The techniques proposed in this thesis fill the blank of available literature and can serve as guidelines for WSN designers, solution providers and system integrators of WSN applications. / Thesis (Ph.D, Electrical & Computer Engineering) -- Queen's University, 2008-01-15 09:33:53.917

The effect of deployment on Canadian military families : a phenomenological study

Roberts, Elna Dorothy 18 April 2013 (has links)
Throughout history, the Canadian Forces has been well known for both its peacekeeping and peace-making roles. This changed, however, after September 11, 2001,when the United States launched an international campaign against terrorism. The Canadian government subsequently committed 2,200 soldiers to assist in this endeavour. Currently the Canadian Forces has about 8,000 members preparing for, engaged in, or returning from an overseas mission on any given day (Department of National Defence, 2008). The purpose of this study is to examine the lived experiences of military female partners whose partners have been deployed, and, in particular, to explore how the military female partner experiences the situation within the family context. The central research question of this study is: From the perspective of the female partner, how has deployment affected her family?

Effectively managing multi-source, Multi-site technology deployments

Emanuel, Mark Eugene 03 October 2011 (has links)
Information Technology infrastructures continue to be dynamic, evolving, and business critical investments for companies of all sizes. Even with moves to virtualize end user computing functions, the evolution of network architectures, mobile computing devices and corporate security requirements will continue to necessitate technology upgrades requiring, at their core, the rudimentary act of placing hardware at specific physical locations on a prescribed timeline. In distributed corporate environments, deploying a range of devices sourced from multiple suppliers into geographically dispersed locations can be a challenge in material management and logistics planning. This Multi-Source, Multi-Site style of deployment is a complex balance of competing timelines where failures to meet delivery targets can have costly impacts that cascade throughout the project. Perturbations in global supply chains, manufacturing schedules, and local shipping capacities drive fluctuations in a supplier's ability to consistently and predictably execute to delivery timelines so it is the task of a deployment Project Manager to interpret a variety supply chain signals and take action to minimize the negative impacts of supply chain challenges. In that effort, the deployment PM will benefit from a structured approach to defining how available supply chain data will be used to help manage expectations, monitor execution, and effect the overall deployment success. In this paper, I present an approach that breaks deployment planning into 3 primary deliverables; the Site Plan, the Data Plan, and the Monitoring Plan. Executing those three plans will drive a PM to understand the supply chain data available to them, translate that data into information useful and understandable by all stakeholders, and monitor the progress of the supply chain against a deployment schedule. In practical terms, those plans culminate in a data mining and data management methodology that can be supported with spreadsheet based dashboards that provide both a fixed Snapshot of the status of the deployment as well as a rolling Timeline of key material movements over the duration of the deployment. The data management approach described here is specifically designed to avoid complex macro development, database queries, or software purchases that may not be available to all Project Managers. Applying the Multi-Source, Multi-Site approach, a PM can gain useful and relevant information from various streams of supply chain data using straightforward spreadsheet manipulations. With a clearer picture of supply chain execution, a PM tasked with a Multi-Source, Multi-Site deployment can better leverage project change control methods to improve their chances of successfully meeting their schedule and cost targets. / text

A study into the technical and managerial manpower in the construction industry

Nazem, S. M. January 1969 (has links)
No description available.

Reproductive energetics of the Common Goby, Pomatoschistus microps (Teleostei : Gobioidei)

Rogers, S. I. January 1986 (has links)
No description available.

Integration of urban wastewater treatment with agricultural reuse in developing countries

Alka, U. January 1985 (has links)
No description available.

A tabu search approach to strategic mobility mode selection

McKinzie, Kaye, Barnes, J. Wesley, January 2005 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2005. / Supervisor: J. Wesley Barnes. Vita. Includes bibliographical references.

Advanced food product quality planning using integrated quantitative techniques

Pable, Anant. January 2007 (has links)
Thesis (M.S.)--State University of New York at Binghamton, Dept. of Systems Science and Industrial Engineering, 2007. / Includes bibliographical references.

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