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Lim, Christopher. "Optimizing access radio in multi-radio mesh network /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CSED%202009%20LIM.
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Robles, Rico Pedro Francisco. "Investigation of IEEE standard 802.16 Medium Access." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7020.
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This paper is a study of IEEE Standard 802.16 Medium Access Control (MAC) Layer in Distributed Mesh Networks. IEEE Standard 802.16 is a Wireless Metropolitan Area Network (WMAN) technology that can connect different IEEE 802.11 (Wifi) host post with each other and to other parts of internet. It can provide network for a wireless router and at the same time this router can be installed in the office, house or university.
WiMAX (Worldwide Interoperability for Microwave Access) is a certification mark for products that pass conformity and interoperability tests for the IEEE 802.16 standards. Products that pass the conformity tests for WiMAX are capable of forming wireless connections between them to permit the carrying of internet packet data. The idea of WiMAX is similar than Wi-Fi but it is not the same. It is a step much higher than Wi-Fi because it is focused to offer internet for a whole city.
It has much higher capacity and longer distances. IEEE 802.16 defines a MAC Layer that supports multiple physical layer (PHY) Specifications and different topologies; Point to Multipoint (PMP) and Mesh Networks. In this first topology there exist a Base Station (BS) that have direct links with all the Subscriber Stations (SS). If any Subscriber Station requires transmitting to another SS, the message must convey the Base Station.
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Khaled, Shah Mostafa. "Heuristic algorithms for wireless mesh network planning." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Mathematics and Computer Science, c2012, 2012. http://hdl.handle.net/10133/3266.
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Technologies like IEEE 802.16j wireless mesh networks are drawing increasing attention of
the research community. Mesh networks are economically viable and may extend services
such as Internet to remote locations. This thesis takes interest into a planning problem in
IEEE 802.16j networks, where we need to establish minimum cost relay and base stations to
cover the bandwidth demand of wireless clients. A special feature of this planning problem
is that any node in this network can send data to at most one node towards the next hop,
thus traffic flow is unsplittable from source to destination.
We study different integer programming formulations of the problem. We propose four
types of heuristic algorithms that uses greedy, local search, variable neighborhood search
and Lagrangian relaxation based approaches for the problem. We evaluate the algorithms
on database of network instances of 500-5000 nodes, some of which are randomly generated
network instances, while other network instances are generated over geometric distribution.
Our experiments show that the proposed algorithms produce satisfactory result
compared to benchmarks produced by generalized optimization problem solver software.x, 131 leaves : ill. ; 29 cm
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Du, Peng. "Bandwidth allocation and channel assignment in WiMax mesh networks /." access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-cs-b30082547f.pdf.
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Thesis (Ph.D.)--City University of Hong Kong, 2009."Submitted to Department of Computer Science in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves 100-108)
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Nsoh, Stephen Atambire. "Resource allocation in WiMAX mesh networks." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Mathematics and Computer Science, c2012, 2012. http://hdl.handle.net/10133/3371.
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The IEEE 802.16 standard popularly known as WiMAX is at the forefront of the technological
drive. Achieving high system throughput in these networks is challenging due to
interference which limits concurrent transmissions. In this thesis, we study routing and link
scheduling inWiMAX mesh networks. We present simple joint routing and link scheduling
algorithms that have outperformed most of the existing proposals in our experiments. Our
session based routing and links scheduling produced results approximately 90% of a trivial
lower bound.
We also study the problem of quality of service (QoS) provisioning in WiMAX mesh
networks. QoS has become an attractive area of study driven by the increasing demand
for multimedia content delivered wirelessly. To accommodate the different applications,
the IEEE 802.16 standard defines four classes of service. In this dissertation, we propose a
comprehensive scheme consisting of routing, link scheduling, call admission control (CAC)
and channel assignment that considers all classes of service. Much of the work in the
literature considers each of these problems in isolation. Our routing schemes use a metric
that combines interference and traffic load to compute routes for requests while our link
scheduling ensures that the QoS requirements of admitted requests are strictly met. Results
from our simulation indicate that our routing and link scheduling schemes significantly
improve network performance when the network is congested.ix, 77 leaves : ill. ; 29 cm
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Russo, Joseph Anthony. "Test and evaluation of meshdynamics 802.11 multi-radio mesh modules in support of coalition riverine operations." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Jun%5FRusso.pdf.
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Thesis (M.S. in Systems Technology (Command, Control and Communications (C3)))--Naval Postgraduate School, June 2006.Thesis Advisor(s): James Ehlert. "June 2006." Includes bibliographical references (p.199-201). Also available in print.
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Milicic, Gregory J. "An analysis of tactical mesh networking hardware requirements for airborne mobile modes /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FMilicic.pdf.
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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, March 2005.Thesis Advisor(s): Alexander Bordetsky. Includes bibliographical references (p. 39-40). Also available online.
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Nawrath, Thomas. "P2P-based Mobility Management for Heterogeneous Wireless Networks and Mesh Networks." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601065.
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Today Moblity Management is one of the most important
tasks that need to be accomplished to secure availability
and performance of communication between people. This paper
explains how moblity management is currently structured
and what algorithms and approaches from Peer-To-Peer
technology could be used to increase availability and
performance.
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Herzig, Joseph F. "An analysis of the feasibility of implementing ultra wideband and mesh network technology in support of military operations /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FHerzig.pdf.
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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, March 2005.Thesis Advisor(s): Alexander Bordetsky. Includes bibliographical references (p. 57-58). Also available online.
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Bach, Eric J. Fickel Mark G. "An analysis of the feasibility and applicability of IEEE 802.X wireless mesh networks within the Global Information Grid /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sep%5FBach.pdf.
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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, Sept. 2004.Thesis advisor(s): Alexander Bordetsky. Includes bibliographical references (p. 81-91). Also available online.
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Fickel, Mark G., and Eric J. Bach. "An analysis of the feasibility and applicability of IEEE 802.X wireless mesh networks within the Global Information Grid." Thesis, Monterey California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1462.
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Approved for public release; distribution is unlimitedThis thesis analyzes the feasibility, functionality, efficacy and usability of IEEE 802.x wireless mesh networks in multiple DoD contexts. Through multiple field and lab experiments and hardware investigations, an assessment is performed on the realistic implementation issues of wireless mesh networks and their possible applications. A detailed examination is conducted of the variable elements, operational constraints, and possible decision points for developing a usable, robust, self-organizing, wireless mesh network that can be leveraged for maximum usability and shared situational awareness in network-centric operations. The research investigates the suitability of currently available COTS hardware and software wireless mesh networking components for geographically distributed networks. Additionally, a product-line software architecture and a common data interchange XML vocabulary are proposed as the enabling technology elements to carry application layer mesh forward for integration of collaborative sensor-decision maker adaptive networks within the Global Information Grid. The thesis includes the design and implementation of the first Naval Postgraduate School testbed for tactical level mesh networking with unmanned vehicles, unattended sensors, and warrior networking nodes. This thesis also lays the groundwork for further research into lower OSI-layer routing protocols for DoD mesh networks, development of mesh-aware applications, as well as a GIG-wide mesh network architecture.
Lieutenant Commander, Supply Corps, United States Navy
Lieutenant Commander, United States Navy
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Selva, Lorenzo. "RELEASING COMPLEX TECTONICS . Robotic-fabricated adaptive formwork for non-standard architectural objects." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13961/.
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Candidato: Lorenzo Selva
Titolo Tesi: “Releasing Complex Tectonics: robotic-fabricated adaptive wireframe formwork for non-standard architectural objects"
La ricerca in questione si focalizza sullo studio di oggetti architettonici con geometria non-standard ed il parallelo sviluppo di un processo di fabbricazione digitale, in grado di snellirne e facilitarne la produzione. Lo stesso, come si può immaginare, sarà utilizzabile anche per oggetti con geometrie di minore complessità, uniformando in questo modo la logica costruttiva. Nello specifico, l’obiettivo è di esplorare le implicazioni architettoniche e le potenzialità formali che si generano dal rapporto tool - materiale. I processi oggi utilizzati, infatti, mostrano alcuni aspetti controversi che ne limitano efficienza ed applicabilità. Su tutti, operazioni di casseratura ed armatura altamente time e material-consuming ed il fatto che gli oggetti, sostanzialmente, vengono costruiti due volte: la prima durante fabbricazione e posa del cassero; la seconda durante il getto e la presa del materiale di filling. La conseguenza è una concreta anti-economicità su più fronti, che conduce talvolta alla ripetizione e alla semplificazione progettuale delle forme. Un approccio alternativo passa inevitabilmente dal superamento di questa logica, indagando la possibilità di fondere queste due operazioni. Releasing Complex Tectonics nasce appunto con l’idea di estrudere roboticamente mesh tridimensionali, denominate leaking fomworks, con integrata la duplice funzione di cassero e rinforzo. Un processo additivo che minimizza lo spreco di materiale, governato digitalmente e con elevato controllo spaziale e geometrico dell’oggetto prodotto, applicabile indistintamente in-situ e in laboratorio, in grado di svincolare la morfologia del prodotto finale dal tempo e dalla complessità delle operazioni necessarie alla sua realizzazione.
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Davis, Joseph A. "An analysis of network and sensor performance within IEEE 802.x wireless MESH networks in the Tactical Network Topology (TNT) /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FDavis.pdf.
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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, March 2005.Thesis Advisor(s): Alexander Bordetsky. Includes bibliographical references (p. 49-50). Also available online.
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Milicic, Gregory J. "Analysis of hardware requirements for airborne tactical mesh networking nodes." Thesis, Monterey California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2218.
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Approved for public release, distribution is unlimitedWireless mesh mobile ad hoc networks (MANETs) provide the military with the opportunity to spread information superiority to the tactical battlespace in support of network-centric warfare (NCW). These mesh networks provide the tactical networking framework for providing improved situational awareness through ubiquitous sharing of information including remote sensor and targeting data. The Naval Postgraduate School's Tactical Network Topology (TNT) project sponsored by US Special Operations Command seeks to adapt commercial off the shelf (COTS) information technology for use in military operational environments. These TNT experiments rely on a variety of airborne nodes including tethered balloon and UAVs such as the Tern to provide reachback from nodes on the ground to the Tactical Operations Center (TOC) as well as to simulate the information and traffic streams expected from UAVs conducting surveillance missions and fixed persistent sensor nodes. Airborne mesh nodes have unique requirements that can be implemented with COTS technology including single board computers and compact flash.
Lieutenant, United States Navy
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El, Masri Ali. "Towards efficient and fair resources management in wireless mesh networks." Thesis, Troyes, 2013. http://www.theses.fr/2013TROY0011/document.
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Le but principal des réseaux mesh sans fil (Wireless Mesh Networks-WMNs) est de fournir une dorsale de communication pour un grand nombre d'utilisateurs, car les WMNs doivent supporter un trafic énorme. Dans cette thèse, nous visons la maximisation d'utilisation et la répartition équitable de la bande passante dans les WMNs. Nous considérons deux environnements : WMN utilisant la norme IEEE 802.11 MAC, qui est caractérisée par son déploiement répandu et peu cher, et WMN utilisant les antennes directionnelles, qui représentent une technologie clé pour la réutilisation spatiale dans les réseaux sans fil. Pour les WMMs basés sur IEEE 802.11, nous concevons NICC, un protocole de contrôle de congestion qui reconnaît la congestion comme un problème lié au voisinage, et non pas au lien. NICC gère la congestion par une collaboration entre les nœuds d’un voisinage sans fil. En faisant usage de certains champs sous-exploités dans l'en-tête IEEE 802.11, NICC fournit un retour de congestion implicite et multi-bit. Ceci assure un contrôle précis du trafic sans affecter la bande passante. Pour les WMNs utilisant les antennes directionnelles, nous concevons FreeDMAC, un protocole MAC basé sur la technologie TDMA. FreeDMAC garantit que chaque nœud est conscient de toutes les transmissions dans son voisinage, ce qui évite les problèmes MAC causés par les antennes directionnelles, et ainsi, améliore l'utilisation de la bande passante. En outre, FreeDMAC est capable de fournir deux niveaux d’équité: équité entre les liens et équité entre les fluxThe main purpose of Wireless Mesh Networks (WMNs) is to provide a communication backbone for a high number of end-users, thus WMNs have to support heavy traffic load. In this thesis, we intend to maximize utilization and achieve fair allocation of the bandwidth resources in WMNs. We consider two WMN environments: WMN using the IEEE 802.11 MAC standard, which is characterized by its cheap devices and widespread deployment, and WMN using directional antennas, which are emerged as an attractive technology to enhance the spatial reusability in wireless networks. For WMM based on IEEE 802.11, we design NICC, a congestion control scheme that recognizes congestion as neighborhood-related problem, and not a link-based one. Indeed, complex interference among neighboring nodes is the main starvation cause in WMNs. Therefore, NICC handles congestion using mutual cooperation within a wireless neighborhood. NICC makes use of some underexploited fields in the IEEE 802.11frame header in order to provide an implicit multi-bit congestion feedback, and thus ensure accurate rate control without generating overhead, making efficient use of bandwidth. For WMN with directional antennas, we design FreeDMAC, a TDMA-based MAC scheme with contention-free scheduling. FreeDMAC guarantees that each node is aware of all ongoing transmissions in its neighborhood, and thus avoids directional-related problems such as deafness, making efficient use of bandwidth. Moreover, FreeDMAC presents a link-slot assignment that provides two levels of fairness: Per-link and per-flow fairness
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Moones, Emna. "Proposition d'une approche méthodologique d'interopérabilité multi-niveaux dans un environnement de PLM collaboratif." Thesis, Paris 8, 2017. http://www.theses.fr/2017PA080093/document.
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Nos travaux de thèse concernent l’´étude de l’interopérabilité dans un environnement collaboratif et dynamique d’entreprise. Elle est considérée comme un facteur clé de collaboration qui doit être pris en compte tout au long du cycle de vie du produit. Ceci est particulièrement important en ce qui concerne les réseaux d'entreprise collaboratifs, tel que DMN, où un groupe distinct de partenaires est connecté dans un modèle en forme de chaîne et où la coopération est cruciale pour atteindre un objectif spécifique. Ce contexte a fait émerger la nécessité de faire inter-opérer une multitude de systèmes d’information, distribués, autonomes et hétérogènes. Sur la base d'une analyse approfondie des problèmes d'interopérabilité au sein du DMN, ces travaux ont abouti `à une approche générique conceptuelle d’interopérabilité multi-niveaux. Cette approche repose sur le standard ISA95 et l’approche d’ingénierie dirigée par les modèles (IDM), notre démarche vise à contribuer à l'amélioration de l'interopérabilité des systèmes d’entreprises au cours de la phase de fabrication du produit dans un DMN collaboratif. En s’intéressant aux trois niveaux d’interopérabilité, cette approche permet de s’assurer que les informations sont physiquement échangées (l'interopérabilité technique), sont comprises (l'interopérabilité sémantique) et sont bien utilisées pour atteindre le but pour lequel elles ont été produites (l'interopérabilité organisationnelle). La qualité et l'efficacité de l'approche proposée ont été confirmées par une application sur un cas concret de collaboration entre ERP et MES dans une usine de fabrication de stylos DEKENZOur thesis work deals with the study of interoperability in a collaborative and dynamic enterprise environment. Interoperability is considered as a key factor for collaboration that must be considered throughout the life cycle of the product. This is particularly important for collaborative enterprise networks, such as DMN, where a group of partners is connected in a chain model and where cooperation is crucial to achieve a specific goal.This context has led to the need for inter-operate a multitude of distributed, autonomous and heterogeneous information systems.Basis on a thorough analysis of the interoperability problems within the DMN, this work proposed a generic conceptual multi-level approach of interoperability. This approach relies on the use of ISA95 standard and Model Driven Engineering (MDE) method. It aims to contribute to the improvement of the interoperability of information systems during the manufacturing phase of the product in a collaborative DMN. By focusing on the three levels of interoperability, this approach ensures that information is physically exchanged (technical interoperability), is understood (semantic interoperability), and is well used to achieve the purpose for which it have been produced (organizational interoperability). The quality and effectiveness of the proposed approach were confirmed by an application on a concrete case of collaboration between ERP and MES in a DEKENZ pen manufacturing plant
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Botta, Sara. "Italianismi nella stampa austriaca. Un'indagine nei mesi di marzo, aprile e maggio 2017." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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La tesi si propone di verificare la presenza di italianismi nella stampa austriaca del giorno d'oggi in quattro testate giornalistiche, Die Presse, Der Standard, Salzburger Nachrichten e Falter, monitorate per un breve arco di tempo (marzo, aprile e maggio 2017). L'elaborato traccia a grandi linee una storia dei contatti linguistici fra Austria e Italia e una breve sintesi della storia della stampa austriaca. Infine verrà stilato un elenco degli italianismi presenti nelle testate analizzate verificandone l'attestazione nei dizionari tedeschi, il contesto e il significato con cui vengono utilizzati.
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Colin, de Verdiere Mathieu. "Damage and strain rate optical characterisation of standard and tufted non crimp fabric carbon composites for meso-scale impact models." Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/7595.
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As global warming is a prime concern to the wellbeing of the planet, lighter planes are a requirement to reduce CO2 emissions. Light structures made of carbon epoxy composite materials are of particular interest but are sensitive to impacts such as hail or bird strikes. Static and dynamic testing of composite specimens and structures (from aeronautical standard) through novel testing methods was the first aim of this PhD research. Subsequently it led to novel material characterisation and material parameters calibration for which numerical simulations of impact responses could be developed. In this research further investigation under static, dynamic and impact loading of two certified aeronautical materials occurred. Carbon non crimp fabric epoxy (tufted and untufted) response was investigated. Novel tests and testing methods were developed for in-plane and for delamination focussing on the use of optical analysis using digital image correlation (DIC) and high speed cameras. A novel damage detection method was proposed using DIC. The experimental data set was used to calibrate a damage model with imposed strain rate laws and added delamination Mode I and II interface prior to a punch validation study. A novel compression apparatus designed for DIC usage worked well in static and dynamic. A novel intermediate strain rate tensile test worked better on bias direction lay-up than on axial one. Dynamic DIC method proved of interest to record strains up to strain rate achieved with a Split Hopkinson pressure bar apparatus. In quasi static tufting reduced axial properties considerably but had little effect in shear loading, in addition it increased significantly the resistance to delamination and reduced the crack speed in dynamic. The damage fields generated allowed for the detection of damage progression for various load cases. More damage occurred in compression and shear than in tension as the tufted laminate showed more pronounced damage than the untufted one. The dynamic effect of tufting on in-plane and impact response was reduced as it increased considerably delamination resistance in Mode I and II. For both tufted and untufted NCF composites, strong strain rate effects were detected from a low speed on the in–plane strength and failure strain as no or little effects were recorded on the material stiffness. Novel dynamic delamination Mode I and II tests combined with optical analysis provided possibilities to detect rate effects and crack speed propagation while loaded in pure mode I and II. No strain rate effects were recorded in delamination Mode I apart from a slight effect during crack initiation which was stronger for the tufted material. In Mode II a slight rate effect was detected for the tufted interface during crack propagation. During out-of-plane impact loading at intermediate speed, a minor negative loading rate effect was detected.The model calibrated in damage, delamination and strain rate prove useful for dynamic DCB representation and assessment of possible mix mode crack loading. Modelling tufts as P-link was of interest but requires further investigation. Damage and strain rate was well modelled in tension, compression and bias direction loading, even if the strain rate shear law would require some modification. A Meso-scale model was validated successfully by means that the model responses would follow the experimental trends in quasi static loading but with the modification of 4 parameters among ±50. Further research could extend its use for impact modelling. This research showed the complexity of the failure mechanism occurring in composite materials, modelling them at high speed in the plane and in out of plane impact remains a difficult challenge. Carbon composites damage sensitivity is significant and invisible to the naked eye for some load cases and lay-ups necessitating regular non destructive testing on aging airframe.
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Soukup, Milan. "Analýza a návrh rozšiřitelnosti MES řešení v potravinářské společnosti." Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-149992.
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The effective use of information system MES (Manufacturing Execution System) in the food company is the main topic of this master's thesis. The modularly built system provides valuable support of the production process on operational level. The thesis concentrates on the analysis of already implemented standard solution in the company's factory. Main goal is to propose expansion of the functioning area to the already existing solution, aiming for effective use of energy resources. It was necessary, in order to be able to achieve the goal, to get familiar with the complex corporate IT/ICT construction in alignment with the company's energy concept. The proposed solution is leaning on application of internal MES project methodology, leading to exact specification of energy component in the factory production frame. The thesis conclusions, besides the proposed solution itself should serve as an argument about the efficiency of starting MES system in other production factories of the company.
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Herzig, Joseph F. Jr. "An analysis of the feasibility of implementing ultra wideband and mesh network technology in support of military operations." Thesis, Monterey California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2285.
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Approved for public release, distribution is unlimitedThis thesis analyzes the feasibility, functionality, and usability of Ultra Wideband technology as an alternative to 802.11 in wireless mesh networks for multiple DoD contexts. Ultra wideband and wireless mesh network technologies and applications are researched and analyzed through multiple field and lab experiments for usability in current, real-world situations. Hardware and software investigations are conducted to determine any implementation issues between ultra wideband and wireless mesh networks. A detailed assessment is conducted of the various elements and operational constraints for developing an ultra wideband mesh network that can be utilized to improve situational awareness in network-centric operations. Through joint research with Lawrence Livermore National Laboratories, various hardware and software components are developed to create a test bed for tactical level ultra wideband and mesh networking experimentation in a highly mobile environment. This thesis also lays the groundwork into future ultra wideband and mesh networking applications.
Lieutenant, United States Navy
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Karapetsas, Konstantinos. "Building a simulation toolkit for wireless mesh clusters and evaluating the suitability of different families of ad hoc protocols for the Tactical Network Topology." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://handle.dtic.mil/100.2/ADA432399.
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Thesis (M.S. in Information Technology Management and M.S. in Computer Science)--Naval Postgraduate School, March 2005.Thesis Advisor(s): Alexander Bordetsky, Gilbert M. Lundy. Includes bibliographical references (p. 69-75). Also available online.
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Davis, Joseph A. Sr. "An analysis of network and sensor performance within IEEE 802.x wireless MESH networks in the Tactical Network Topology (TNT)." Thesis, Monterey California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2297.
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Approved for public release, distribution is unlimitedThe objective of this research is to analyze the network performance and sensor functionality, efficacy and usability of IEEE 802.x wireless MESH networks within a DoD Tactical network environment. Multiple sensor configurations operating with wireless MESH network technologies will be researched and analyzed for performance in expeditionary environment situations. Specifically, this thesis will attempt establish the foundation for the development of wireless MESH "network health" models by examining the performance of sensors operating within a MESH network and define which network performance metrics equate to good quality of service. This research will experiment with different application, sensor, and network configurations of currently available COTS components, such as, voice, video and data hardware. This thesis will lay the groundwork for wireless network MESH predictability, which will enable the optimal use of sensors within a tactical network environment.
Lieutenant Commander, United States Navy
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Sieklik, Ivan. "Thread Smart Home Model." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316420.
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This thesis is focused on smart buildings where communication and automatization technologies are deployed. It includes overview and description of frequently applied network protocols in smart homes and their side by side comparison with an emphasis on Thread networking protocol. The next chapters describe details and parameters of used development boards provided by NXP Semiconductors and their implementation in a smart home model. Subsequent chapters are focused on hardware and software components which are the basis for smart home model’s internal workings. The last chapter highlights how a physical model of a smart home was developed with suggestions for future improvements.
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Klopson, Jadon E., and Stephen V. Burdian. "Collaborative applications used in a wireless environment at sea for use in Coast Guard Law Enforcement and Homeland Security missions." Thesis, Monterey, California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2311.
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Approved for public release, distribution is unlimitedThis thesis analyzes the potential impact of incorporating wireless technologies, specifically an 802.11 mesh layer architecture and 802.16 Orthogonal Frequency Division Multiplexing, in order to effectively and more efficiently transmit data and create a symbiotic operational picture between Coast Guard Cutters, their boarding teams, Coast Guard Operation Centers, and various external agencies. Two distinct collaborative software programs, Groove Virtual Office and the Naval Postgraduate School's Situational Awareness Agent, are utilized over the Tactical Mesh and OFDM network configurations to improve the Common Operating Picture of involved units within a marine environment to evaluate their potential impact for the Coast Guard. This is being done to increase the effectiveness and efficiency of Coast Guard units while they carry out their Law Enforcement and Homeland Security Missions. Through multiple field experiments, including Tactical Network Topology and nuclear component sensing with Lawrence Livermore National Laboratory, we utilize commercial off the shelf (COTS) equipment and software to evaluate their impact on these missions.
Lieutenant Commander, United States Coast Guard
Lieutenant, United States Coast Guard
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Badawi, Hawazin Faiz. "DT-DNA: Devising a DNA Paradigm for Modeling Health Digital Twins." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/41906.
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The potential of Digital twin (DT) technology outside of the industrial field has been recognized by researchers who have promoted the vision of applying DTs technology beyond manufacturing, to purposes such as enhancing human well-being and improving quality of life (QoL). The expanded definition of DTs to incorporate living and nonliving physical entities into the definition of DTs was a key motivation behind the model introduced in this thesis for building health digital twins of citizens. In contrast with DTs that have been developed in more industrial fields, this type of digital twins modeling necessitates protecting each citizen's unique identity while also representing features common to all citizens in a unified way. In nature, DNA is an example of a model that is both unified, common to all humans, and unique, distinguishing each human as an individual. DNA’s architecture is what inspired us to propose a digital twin DNA (DT-DNA) model as the basis for building health DTs for citizens. A review of the literature shows that no unified model for citizens’ health has been developed that can act as a base for building digital twins of citizens while also protecting their unique identity thus we aim to fill this gap in this research. Accordingly, in this thesis, we proposed a DT-DNA model, which is specifically designed to protect the unique identity of each citizen’s digital twin, similar to what DNA does for each human. We also proposed a DT-DNA-based framework to build standardized health digital twins of citizens on micro, meso and macro levels using two ISO standards: ISO/IEEE 11073 (X73) and ISO 37120. To achieve our goal, we started by analyzing the biological DNA model and the influencing factors shaping health in smart cities. The purpose of the first is to highlight the DNA model features which provide the building blocks for our DT-DNA model. The purpose of the latter is to determine the main bases of our DT-DNA model of health DTs. Based on the analysis results; we proposed DT-DNA to model health DTs for citizens. In keeping with our DNA analogy, we have identified four bases, A, T, G, and C, for our unified and unique DT-DNA model. The A base in the proposed model represents a citizen’s anthropometric when we build the DT-DNA on an individual level and represents the city’s regulatory authorities when we build the DT-DNA on community and city levels. The T base represents different tasks included in the provided health data that are required to model citizens’ health DT-DNA on different levels. The G base represents the geographic and temporal information of the city, where the citizen exists at the time of data collection. The C base represents the context at the time of data collection. To proof the concept, we present our initial work on building health DTs for citizens in four case studies. The first two case studies are dedicated for health DTs at the micro level, the third case study is dedicated for health DTs at the meso level and the fourth case study is dedicated for health DTs at the macro level. In addition, we developed an algorithm to compare cities in terms of their community fitness and health services status. The four case studies provide promising results in terms of applicability of the proposed DT-DNA model and framework in handling the health data of citizens, communities and cities, collected through various sources, and presenting them in a standardized, unique model.
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Alsmadi, Laith, and 哈馬迪. "A Study on Wireless Mesh Networks based on the IEEE 802.11s Standard." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/62604114781641464397.
Full textAbstract:
碩士國立交通大學
電信工程研究所
99
Wireless mesh networking based on 802.11 Wireless Local Area Network (WLAN) has been explored for a few years. To improve the performance of WLAN mesh networks, a few new communication protocols have been developed in recent years. However, these solutions are usually proprietary and prevent WLAN mesh networks from interworking with each other. Thus, a standard becomes indispensable for WLAN mesh networks. To meet this need, an IEEE 802.11 task group, i.e., 802.11s, is specifying a standard for WLAN mesh networks. Although several standard drafts have been released by 802.11s, many issues still remain to be resolved. In order to understand what functions can be expected from the existing framework of 802.11s standard and what additional functionalities shall be added to 802.11s standard to improve its performance, a detailed study on wireless mesh networks based on the existing 802.11s standard is given in this work.
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Anh, Hoang, and 黃英. "Study on Elliptic Curve Cryptography schemes for IEEE 802.16 Standard in Mesh Networks." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/63070240144188915968.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
98
WiMAX is a promising technology for next generation Broadband Wireless Access. In term of security, until recently, most of the wireless industry and its users mistakenly believed that the standard’s major security weakness was its use of 56-bit Data Encryption Standard. In fact, the key size is one of the standard’s most insignificant security weaknesses. In this thesis, we studied on cryptosystems. By employing Elliptic Curve Cryptography schemes, we can achieve the secure communication in case of WiMAX Mesh networks. There are significant schemes was used, such as: Key agreement schemes provide a shared secret key; Digital signature scheme is used for authenticating a device or a message send by a device; Encryption schemes are method for providing privacy. However, we have to analyses the threats before we can propose or design any security solutions. Therefore, the WiMAX Security threats analyses method also was used. In addition, we propose the security architecture for IEEE 802.16 mesh mode to improve the security based on cryptosystems. In fact, RSA is by far the most widely used public-key algorithm today. However, ECC offers equivalent security at much smaller key sizes. ECC is especially attractive for constrained wireless devices because the smaller keys result in memory, bandwidth and computational savings. In summary, security area is an excellent combination between mathematic and engineering, which we have done in the thesis.
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Yu-Hsin, Chen, and 陳又新. "A QoS Preserved Scheme based on IEEE 802.11e Standard Deployed by a mesh network." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/58422479325826043136.
Full textAbstract:
碩士東海大學
資訊工程與科學系
95
Due to incessant advancement of communication technology, wireless networking has become one of the most popular techniques in next generation of network area. Recent wireless network protocols have evolved swiftly to provide with extensive and flexible wireless services to users. Lots of products have been designed and marketed. Many researchers have studied how to improve routing efficiency and channel utilization of wireless networks. The Voice over Internet Protocol (VoIP) supported by wireless technology has made Internet accesses more versatile and flexible than before. However, the more sessions established for communication, the longer the transmission delay and the higher the packet dropping rate. In this paper, an efficient scheme developed on the IEEE 802.11e standard for mesh network is proposed. It not only provides qualified transmission, but also increases communication channel utilization. Experimental results show that this approach significantly improves a system’s throughput as compared with those developed on 802.11b and other schemes.
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Moleme, Nametshego Hanah. "Cross-layer optimization for video-streaming applications over IEEE 802.11 wireless Mesh network." 2008. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000647.
Full textAbstract:
M. Tech. Electrical Engineering.Discusses the transport of real time data in WMNs as a challenging problem. The main cause of this problem is transport layer protocols. These protocols have traditionally been used successfully for wired networks. However, their raw implementation in wireless networks has proven to be inefficient, since wireless channels are characterized by a higher Bit Error Rate (BER), Packet Loss Rate (PLR), interference, bandwidth limitations and mobility when compared to wired network channels. Thus, for the efficient transport of real time video in WMNs, transport protocols need to be adapted to be adapted to wireless networks since they were not originally developed for this application.
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Andrighetti, Traci Lee. "Setting a new standard: a sociolinguistic analysis of the regional Italian of Sicily in Andrea Camilleri’s Commissario Montalbano mystery series." 2009. http://hdl.handle.net/2152/7554.
Full textAbstract:
The purpose of this study was to conduct a sociolinguistic analysis of the regional Italian of Sicily in Andrea Camilleri’s Un mese con Montalbano (A Month with Montalbano). The lexical portion of a model developed by Sgroi (1990) to examine the use of regional Italian in literature was applied to the thirty short stories in Camilleri’s text to isolate the components of this variety. The study also attempted to identify the socio-economic features of the characters who speak regional Italian, the contexts of use of this variety and what the regionalisms in the stories indicate about Italy and the speech of Italians. The model revealed that Camilleri utilizes three main types of language to regionalize his prose: Sicilian Italian regionalisms; phonological adaptations of Sicilian dialect terms; and, hyperfrequent Italian words. The regional terms comprise only 24.4% of the lexemes identified by the model, while 40.4% represent Italianizations of Sicilian dialect that may be artistic adaptations of the author. A surprising 33.4% of the terms are standard Italian words that appear to have been chosen by Camilleri due to their similarity to equivalent Sicilian dialect terms. With respect to the sociolinguistic aspects of the study, the findings were somewhat problematic owing to the nature of the mystery genre. Specifically, middle-aged policemen and police-related contexts of use are disproportionately represented in the stories. Nevertheless, it was determined that regional Italian is spoken by male and female characters who represent a wide range of ages and occupations. Furthermore, results illustrated that regionalisms are uttered most frequently in professional, public and formal contexts. The requisites of the mystery genre also affected the findings in regard to Camilleri’s portrayal of Italy and Italian speech. Much of the regional language used in the text exaggerates the criminal aspects of Italian society and the expressive quality of this variety. In a more realistic vein, however, many regionalisms emphasize the multi-cultural makeup of the country and the intangible facet of Italianness. In general, the textual analysis indicates that regional Italian is a complex variety which may enjoy a broader usage in contemporary Italy than the traditional dialects.text