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Teses / dissertações sobre o tema "Energy Localization"

Autor: Grafiati
Publicado: 19 de outubro de 2024
Última modificação: 31 de julho de 2025

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1

Shareef, Ali. "Localization and Energy Modeling in Wireless Sensor Networks." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/ShareefA2008.pdf.

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2

Ezanno, Philippe. "Vibration localization and statistical energy analysis in coupled systems." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-06112009-063056/.

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3

Vecchia, Davide. "Energy-efficient, Large-scale Ultra-wideband Communication and Localization." Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/349081.

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Among the low-power wireless technologies that have emerged in recent years, ultra-wideband (UWB) has successfully established itself as the reference for accurate ranging and localization, both outdoors and indoors. Due to its unprecedented performance, paired with relatively low energy consumption, UWB is going to play a central role in the next wave of location-based applications. As the trend of integration in smartphones continues, UWB is also expected to reach ordinary users, revolutionizing our lives the same way GPS and similar technologies have done. But the impact of UWB may not be l
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4

Zegeye, Wondimu, and Lawrence Lee. "LOCALIZATION OF MEDICAL DEVICES BASED ON BLUETOOTH LOW ENERGY (BTLE)." International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/626971.

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Wireless devices have invaded the medical industry with a wide range of capability as components of a wireless personal area network (WPAN) and Wireless Body Area Network (WBAN). The recent advances in Internet of Things (IoT) promises even larger contributions to the future of medical applications. This paper investigates the Bluetooth Low Energy (Bluetooth Smart- BTLE) for indoor localization of HealthCare devices used in medical telemetry applications and demonstrates the key role that localization plays in tracking of Bluetooth Low Energy enabled medical devices. Proper tracking of these d
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5

Alajlouni, Sa'ed Ahmad. "Energy-based Footstep Localization using Floor Vibration Measurements from Accelerometers." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/103466.

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This work addresses the problem of localizing an impact in a dispersive medium (waveguide) using a network of vibration sensors (accelerometers), distributed at various locations in the waveguide, measuring (and detecting the arrival of) the impact-generated seismic wave. In particular, the last part of this document focuses on the problem of localizing footsteps using underfloor accelerometers. The author believes the outcomes of this work pave the way for realizing real-time indoor occupant tracking using underfloor accelerometers; a system that is tamper-proof and non-intrusive compared
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6

Imam, Farasat. "Bluetooth Low Energy (BLE) based Indoor Localization using Fingerprinting Techniques." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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Positioning technologies have been created over the last few decades to provide users with location and navigation services by utilizing technological advancements in digital circuitry. GPS was one of the first positioning systems to be created (Global Positioning System). This system is a location-based navigation system that operates through satellites. Using GPS used to necessitate special (expensive) hardware, but smartphone technology has made it possible to use GPS on our handheld devices without the need for any additional equipment. We're all familiar with this; we use GPS on our smart
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7

MOHAPATRA, HEMANT R. "ENERGY-AWARE CLUSTERING AND LOCALIZATION ALGORITHMS FOR MOBILE SENSOR NETWORKS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1140533134.

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8

Fabbri, Davide <1990&gt. "Energy Autonomous RF Tags for Sensing and UWB Localization Applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9610/1/Fabbri_Davide_tesi.pdf.

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In the new scenarios foreseen by the Internet of Things (IoT), billions of smart devices are worldwide spread and connected to each other to provide sensing information or to detect and locate tagged items with high accuracy using cheap, energy autonomous, and disposable tags. In this context, the use of energy harvesting techniques to supply devices, nowadays, plays an important role in order to create energy autonomous systems able to reduce the use of batteries, by containing the infrastructure maintenance costs, for better environmental safeguard. Hence, by considering real scenarios in wh
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9

Giovanelli, Davide <1988&gt. "Bluetooth Low Energy based proximity detection and localization in smart communities." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/9015/1/giovanelli_davide_tesi.pdf.

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Internet of things will bring connected devices to a new level of pervasiveness, where any tangible thing of our daily life may embed some electronics. From a sophisticated smartwatch that embeds complex sensing and communication technologies, to the use of a basic electronic component to implement a digital signature, such as RFIDs. All these smart things worn or distributed around us enables multiple functionalities, when they can interact with each other. In this thesis, I describe the design, characterization and validation of a monitoring system based on Internet of Things technologies, f
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10

Snyder, Kenneth A. "Energy localization and transport in binary isotopically disordered Fermi-Pasta-Ulam chains." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2643.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.<br>Thesis research directed by: Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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11

Robles, Jorge Juan [Verfasser]. "Energy-Efficient Indoor Localization Based on Wireless Sensor Networks / Jorge Juan Robles." München : Verlag Dr. Hut, 2015. http://d-nb.info/1075408962/34.

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12

Schornak, Joseph George. "A Minimum-Bending-Energy Needle Model for Closed-Loop Localization During Image-Guided Insertion." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/311.

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Accurate needle placement is critical to the success of needle-based interventions. Needle deflection due to tissue non-homogeneity and dynamic forces results in targeting error, potentially requiring repeated insertions. Real-time imaging enables closed-loop control of the needle during insertion, improving insertion accuracy. The needle localization algorithm proposed in this thesis models the needle as a parametric polynomial equation optimized to minimize beam bending energy relative to a set of observed needle coordinates. Simulated insertions using an MRI dataset show that the minimum be
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13

Zorzi, Francesco. "Localization and network management in radio and underwater networks." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3426983.

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Wireless Sensor Networks (WSNs) have been widely studied in the last decade because of the large set of applications that can be potentially enabled by this novel network paradigm, as environmental monitoring, home automation, localization and tracking of mobile users, seamless and ubiquitous data exchange. However, the severe constraints in terms of energy, processing, memory and reliability of the low--cost sensor devices left a number of unresolved problems, open to research. This thesis tackles two of the most interesting problems concerning WSNs, namely localization and traffic managem
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14

Chlad, Miloslav. "Lokalizační systém." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318188.

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The intent of this master’s thesis is to look for the best solution of finding lost items of everyday use. Described solution is based on GPS for outdoor and Bluetooth Low Energy for indoor localization. User of this system will be able to find his/her lost items using smartphone application.
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15

Muschielok, Adam. "Development and application of a quantitative analysis method for fluorescence resonance energy transfer localization experiments." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-135739.

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16

Baker, Anton Martyn Roman. "Magnetotransport in graphene : a study of quantum Hall breakdown, energy loss rates, and weak localization." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:04d5ffde-000a-40ff-9953-453ff4b0d854.

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This thesis reports magnetotransport measurements in graphene Hall bar devices. Graphene samples fabricated from different techniques (epitaxial growth on silicon carbide, exfoliation, and CVD) are measured and compared. Measurements are taken primarily using a 21T magnet, at liquid Helium 4 temperatures. The first three chapters present the background for the work. Chapter One details the motivation for the thesis, and gives a general background to carbon and the state of carbon research. Chapter Two covers the theoretical background of graphene, including the anomalous quantum Hall effect an
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17

Díaz, Rubio Ana. "Control of electromagnetic energy by metamaterials." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/54137.

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[EN] Metamaterials are periodic structures whose unit cells are small compared to the wavelength at the operating frequency. Under these conditions, these artificial materials can be considered as homogeneous media whose constitutive parameters depend on the characteristics of the unit cells. The discovery of metamaterials opened a new research field that has produced many works with microwaves, optical waves and acoustic waves. In this context, the main goal of this thesis is the study of new structures based on metamaterials that allow controlling of electromagnetic energy. In particular, n
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18

Muschielok, Adam [Verfasser]. "Development and Application of a Quantitative Analysis Method for Fluorescence Resonance Energy Transfer Localization Experiments / Adam Muschielok." München : Verlag Dr. Hut, 2011. http://d-nb.info/1017353719/34.

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19

Saraswat, Suraj. "Investigation of Energy Transfer, Quantification, and Localization of Peptides and Proteins by Fluorescence Spectroscopy and Mass Spectrometry." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1341599821.

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20

Whitney, Ann M. "INDOOR-WIRELESS LOCATION TECHNIQUES AND ALGORITHMS UTILIZING UHF RFID AND BLE TECHNOLOGIES." UKnowledge, 2019. https://uknowledge.uky.edu/me_etds/138.

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The work presented herein explores the ability of Ultra High Frequency Radio Frequency (UHF RF) devices, specifically (Radio Frequency Identification) RFID passive tags and Bluetooth Low Energy (BLE) to be used as tools to locate items of interest inside a building. Localization Systems based on these technologies are commercially available, but have failed to be widely adopted due to significant drawbacks in the accuracy and reliability of state of the art systems. It is the goal of this work to address that issue by identifying and potentially improving upon localization algorithms. The work
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21

Szilassy, Martin, and Daniel Örn. "Low Energy GPS Positioning : A device-server approach." Thesis, Linköpings universitet, Reglerteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118788.

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GPS is widely used for localization and tracking, however traditional GPS receivers consume too much energy for many applications. This thesis implements and evaluates the performance of a low energy GPS solution, including a working hardware prototype, that reduces energy consumption significantly. The prototype operates for 2 years on a coin cell battery, sampling every minute. The corresponding time for a traditional receiver is 2 days. The main difference is that a traditional receiver requires 30 seconds of data to estimate a position; this solution only requires 2 milliseconds of data, a
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22

Stephens, Bonnie Baggett. "Chemosensory Responses in Azospirillum brasilense." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/biology_diss/11.

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The ability to swim and navigate the surrounding environment confers an advantage to motile bacteria, allowing the occupation of niches that are optimum for survival and growth. Bacteria are too small to sense their environment spatially, so they must sense the environment temporally by comparing the past and present environments and altering their motility accordingly. Chemotaxis systems coordinate flagellar motility responses with temporal sensing of the environment. Chemotaxis is proposed to be involved in plant root colonization by directing soil bacteria toward root exudates of various c
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23

Zhang, Rui. "Sink localization and topology control in large scale heterogeneous wireless sensor networks." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002048.

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24

Johnson, Adiv Adam. "Effects of Disease-Causing Mutations Associated with Five Bestrophinopathies on the Localization and Oligomerization of Bestrophin-1." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/314121.

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Mutations in BEST1, the gene encoding for Bestrophin-1 (Best1), cause five, clinically distinct inherited retinopathies: Best vitelliform macular dystrophy (BVMD), adult-onset vitelliform macular dystrophy (AVMD), autosomal recessive bestrophinopathy (ARB), autosomal dominant vitreoretinochoroidopathy (ADVIRC), and retinitis pigmentosa (RP). Little is known regarding how BEST1 mutations cause disease and why mutations cause multiple disease phenotypes. Within the eye, Best1 is a homo-oligomeric, integral membrane protein that is exclusively localized to the basolateral plasma membrane of the r
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25

Collin, Maria. "Brain control of energy balance : localization and regulation of proteins involved in the central control of food intake and body weight /." Stockholm, 2004. http://diss.kib.ki.se/2004/91-7349-818-1/.

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26

Nilsson, Anders. "Studies of the Carbon and Energy Metabolism in the Moss Physcomitrella patens." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-109358.

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27

Dowlati, Milesarah Shakiba. "Design of biperiodic structures for vibration energy harvesting." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCD026.

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L’introduction de légères perturbations dans la périodicité d’oscillateurs périodiques faiblement couplés s’avère être une solution prometteuse pour améliorer la puissance récupérée ainsi leur bande passante. Ces légères perturbations dans la périodicité des récupérateurs d’énergie créent des modes de vibration localisés, permettant de réduire considérablement leur nombre de transducteurs et leur encombrement. Cette thèse de doctorat porte sur l’optimisation du design de structures périodiques et bi-périodiques pour la récupération d’énergie vibratoire. Tout d’abord, le design d’oscillateurs p
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28

Oztarak, Hakan. "An Energy-efficient And Reactive Remote Surveillance Framework Using Wireless Multimedia Sensor Networks." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614328/index.pdf.

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With the introduction of Wireless Multimedia Sensor Networks, large-scale remote outdoor surveillance applications where the majority of the cameras will be battery-operated are envisioned. These are the applications where the frequency of incidents is too low to employ permanent staffing such as monitoring of land and marine border, critical infrastructures, bridges, water supplies, etc. Given the inexpensive costs of wireless resource constrained camera sensors, the size of these networks will be significantly larger than the traditional multi-camera systems. While large number of cameras ma
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29

Shah, Ghalib Asadullah. "Energy-efficient Real-time Coordination And Routing Framework For Wireless Sensor And Actor Networks." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608239/index.pdf.

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In Wireless Sensor Actor Networks (WSANs), sensor nodes perform the sensing task and actor nodes take action based on the sensed phenomenon. The presence of actors in this configuration can not be benefited from, unless they are able to execute actions at right place and right time in the event region. The right place can be related to the accurate position of the sensor nodes. While, the right time is related to delivering the packets directly to the appropriate actors within the event specific response times. Hence, the efficient localization of sensor nodes, sensor-actor/actor-actor coordin
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30

Muschielok, Adam [Verfasser], and Jens [Akademischer Betreuer] Michaelis. "Development and application of a quantitative analysis method for fluorescence resonance energy transfer localization experiments : Bayesian inference of macromolecule structures / Adam Muschielok. Betreuer: Jens Michaelis." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2011. http://d-nb.info/1016419813/34.

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31

Wahalathantri, Buddhi Lankananda. "Damage assessment in reinforced concrete flexural members using modal strain energy based method." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/59509/1/Buddhi_Wahalathantri_Thesis.pdf.

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Damage assessment (damage detection, localization and quantification) in structures and appropriate retrofitting will enable the safe and efficient function of the structures. In this context, many Vibration Based Damage Identification Techniques (VBDIT) have emerged with potential for accurate damage assessment. VBDITs have achieved significant research interest in recent years, mainly due to their non-destructive nature and ability to assess inaccessible and invisible damage locations. Damage Index (DI) methods are also vibration based, but they are not based on the structural model. DI meth
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32

Chaitanya, Deshpande. "Multi-Agent Based Fault Localizationand Isolation in Active DistributionNetworks." Thesis, KTH, Industriella informations- och styrsystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169221.

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Liberalized electricity markets, increased awareness of clean energy resources and theirdecreasing costs have resulted in large numbers of distributed power generators beinginstalled on distribution network. Installation of distributed generation has altered thepassive nature of distribution grid. A concept of Active Distribution Network is proposedwhich will enable present day infrastructure to host renewable energy resources reliably.Fault management that includes fault localization, isolation and service restoration ispart of active management of distribution networks.This thesis aims to in
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33

Theljeoui, Adel. "Système hybride de localisation des personnes âgées dans un habitat intelligent." Thesis, Toulouse 2, 2017. http://www.theses.fr/2017TOU20123.

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Durant la dernière décennie, les personnes âgées vivant seules sont de plus en plus nombreuses. Ainsi, afin de leur assurer une assistance à domicile continue, la notion de "maison intelligente" est apparue. Notre travail consiste à combiner trois technologies (Bluetooth Low Energy, audio et LiFi) afin de proposer un système hybride de localisation d'une personne âgée dans une maison intelligente, qui soit efficace et précis. Le principe d’hybridation de ces trois sous-systèmes repose sur la fusion de leurs résultats respectifs via la proposition de trois nouvelles métriques « DOP-Like » perme
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34

Maňák, Jiří. "Energetická náročnost lokalizačních algoritmů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219344.

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This masters thesis deals with technics of localization for wireless senzor networks with a focus on anchor free location algorithm by authors G. Jianquan and Z. Wei. It also describes the available simulations frameworks based on OMNeT++ platform and implementation of the anchor free algorithm in the simulation program Castalia. Furthermore, it deals with the energy demands of this algorithm based on results of simulations that were done for the communication unit IRIS.
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35

Güvenç, İsmail. "Towards practical design of impulse radio ultrawideband systems: Parameter estimation and adaptation, interference mitigation, and performance analysis." Scholar Commons, 2006. http://scholarcommons.usf.edu/etd/2541.

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Ultrawideband (UWB) is one of the promising technologies for future short-range high data rate communications (e.g. for wireless personal area networks) and longer range low data rate communications (e.g. wireless sensor networks).Despite its various advantages and potentials (e.g. low-cost circuitry, unlicensed reuse of licensed spectrum, precision ranging capability etc.), UWB also has its own challenges. The goal of this dissertation is to identify and address some of those challenges, and provide a framework for practical UWB transceiver design.In this dissertation, various modulation opti
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36

Antepli, Mehmet Akif. "A Study On Certain Theoretical And Practical Problems In Wireless Networks." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612603/index.pdf.

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The aim of the thesis is to investigate the design of efficient wireless networks through practical as well as theoretical considerations. We constructed a wireless sensor network (WSN) testbed with battery operated nodes capable of RF communication. The system is a centralized tree-based WSN to study challenges of target modeling, detection, and localization. The testbed employed magnetic sensors, on which relatively few results have been reported in the literature. A ferrous test target is modeled as magnetic dipole by validating experimentally. The problem of sensor sensitivity variation i
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37

Battistini, Nicholas. "Digital design of an EPC Gen2 controller for enhanced RFID tags." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19641/.

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This thesis presents an improvement of the long range battery-less UHF RFID platform for sensor applications which is based on the open source Wireless Identification and Sensing Platform (WISP) project. The purpose of this work is to design a digital logic that performs the RFID EPC gen2 protocol communication, is able to acquire information by sensors and provide an accurate estimation of tag location ensuring low energy consumption. This thesis will describe the hardware architecture on which the digital logic was inserted, the Verilog code developed, the methods by which the digital logic
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38

Vieira, Renato Juliani Ribamar. "Laser a base de pó de neodímio com granulação nanométrica." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-25082011-151007/.

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O interesse na pesquisa de Lasers randômicos, meios dispersivos com alto ganho, tem crescido nos últimos anos em virtude das novas possibilidades advindas ao se trabalhar com estes sistemas, como emissões em bandas com baixo ganho, bicromaticidade, localização da luz em meios difusos e sistemas ópticos mais compactos. Nesse trabalho serão discutidos temas como espalhamento da luz por partículas, intensidade de retroespalhamento, ganho em meios desordenados e as transições energéticas do neodímio, correlacionando as emissões características obtidas nos experimentos com a teoria. Quanto aos resu
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39

Isacco, Laurie. "Utilisation des substrats énergétiques à l'exercice chez la femme : influence de la contraception orale, de la prise alimentaire et de la localisation des graisses." Thesis, Clermont-Ferrand 2, 2012. http://www.theses.fr/2012CLF20060.

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La production endogène ou la prise exogène d’hormones sexuelles chez la femme génère un climat hormonal qui lui est propre. Ces particularités endocriniennes influent sur la composition corporelle et modifient les sécrétions et/ou la sensibilité de certaines hormones clés du métabolisme énergétique pouvant conduire à une utilisation spécifique des substrats énergétiques à l’exercice. L’objectif de ce travail était d’étudier l’influence d’une contraception orale (CO : mini dosée monophasique), de la prise alimentaire pré-exercice et de la localisation des graisses sur les réponses métaboliques
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40

Perraud, Simon. "Etude de puits quantiques semiconducteurs par microscopie et spectroscopie à effet tunnel". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2007. http://tel.archives-ouvertes.fr/tel-00606632.

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Des puits quantiques à base d'hétérostructures In0.53 Ga0.47 As/In0.52 Al0.48 As, fabriqués par épitaxie par jets moléculaires sur substrats InP(111)A, sont étudiés par microscopie et spectroscopie à effet tunnel à basse température et sous ultra-vide. La première partie est consacrée à une étude de la surface épitaxiée (111)A de In0.53 Ga0.47 As de type n. Il est découvert que le niveau de Fermi de surface est positionné dans la bande de conduction, à proximité du niveau de Fermi de volume, et peut être partiellement contrôlé en variant la concentration d'impuretés de type n dans le volume. Ce
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41

Šimek, Milan. "Výběr referenčních uzlů pro bezkotevní lokalizační techniky v bezdrátových senzorových sítích." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-233511.

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Dizertační práce se zabývá návrhem nového bezkotevního lokalizačního algoritmu sloužícího pro výpočet pozice uzlů v bezdrátových senzorových sítích. Provedené studie ukázaly, že dosavadní bezkotevní lokalizační algoritmy, pracující v paralelním režimu, dosahují malých lokalizačních chyb. Jejich nevýhodou ovšem je, že při sestavení množiny referenčních uzlu spotřebovávají daleko větší množství energie než algoritmy pracující v inkrementálním režimu. Paralelní lokalizační algoritmy využívají pro určení pozice referenční uzly nacházející se na protilehlých hranách bezdrátové sítě. Nový lokalizačn
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42

Olesen, Ole Berdiin. "Smarter Fault Localization in Distribution Systems : A Self-Sustained Sensor for Current Measurement." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-27227.

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This thesis deals with the development of self-sustained sensors based on non-conventional measurement techniques. The motivation behind this topic is to help utility companies reduce their fault handling time and improve the way faults are handled. As of today, the distribution system does not have widespread surveillance and automation systems in place. The thesis therefore investigates a sensor design based on Rogowski coils (RC), with both measurement and power supply capabilities.The concept of printed-circuit-board Rogowski coils (PCB RC) and conventional RCs for current measurement is p
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43

Jouni, Zalfa. "Analog spike-based neuromorphic computing for low-power smart IoT applications." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST114.

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Avec l'expansion de l'Internet des objets (IoT) et l'augmentation des appareils connectés et des communications complexes, la demande de technologies de localisation précises et économes en énergie s'est intensifiée. Les techniques traditionnelles de machine learning et d'intelligence artificielle (IA) offrent une haute précision dans la localisation par radiofréquence (RF), mais au prix d'une complexité accrue et d'une consommation d'énergie élevée. Pour relever ces défis, cette thèse explore le potentiel de l'informatique neuromorphique, inspirée par les mécanismes du cerveau, pour permettre
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44

Trambly, de Laissardière Guy. "Etude théorique de la structure électronique des matériaux quasicristallins." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10075.

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Les quasicristaux sont des solides ordonnes presentant une coherence orientationnelle a longue distance sans periodicite de translation. Leurs proprietes electroniques sont spectaculaires. Par exemple, la phase alpdre presente une resistivite de semi-conducteur (> 10 ohm. Cm a 4 k), bien que sa densite d'etats au niveau de fermi soit environ 1/10 de celle de l'aluminium pur. Une etude numerique de plusieurs alliages intermetalliques a base d'aluminium et d'approximants realistes de quasicristaux a permis de degager deux caracteristiques essentielles de leur structure electronique: un creusemen
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45

Ngapasare, Arnold. "Waves in disordered and nonlinear mechanical structures." Thesis, Le Mans, 2020. http://www.theses.fr/2020LEMA1036.

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Ce travail est consacré à l’ étude théorique et numérique de la propagation des ondes élastiques dans les structures mécaniques désordonnées. L’ objectif principal est d’ étudier comment la localisation induite par le désordre est affectée par la non-linéarité et par la présence de mouvements de rotations. Nous étudions d’abord une chaîne granulaire finie et montrons que non seulement la localisation d’ Anderson est rompue mais aussi que l’ équipartition de l’ énergie est réalisée grâce à la non-linéarité discontinue propre aux chaînes granulaires. De plus, nous étendons nos études à un reseau
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46

Hartig, Michael. "Loi de van der Waals-London pour les systèmes d'atomes et de molécules relativistes." Thesis, Toulon, 2019. http://www.theses.fr/2019TOUL0009.

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On considère un système constitué de plusieurs atomes où les noyaux sont supposés fixes et ponctuels. Les particules interagissent via le potentiel de Coulomb et les électrons ont une énergie cinétique pseudo-relativiste donnée par (p2+m2)1/2-m. On démontre la loi de van der Waals-London qui dit que l'énergie d'interaction entre atomes neutres décroit comme |D|-6 où |D| est la distance entre atomes. Nous calculons rigoureusement tous les termes de l'énergie de liaison jusqu'à l'ordre |D|-9 avec un terme d'erreur en O(|D|-10). Comme étape intermédiaire, nous établissons la décroissance exponent
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47

Georgescu, Ionut. "Rare-gas clusters in intense VUV laser fields." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1226316004337-66645.

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A hybrid quantum-classical approach to the interaction of atomic clusters with intense laser fields in the vacuum ultra-violet (VUV) has been developed. Much emphasis is put on localized electrons, those quasi-free electrons which localize about the ions and screen them. These electrons set a time scale, which is used to interpolate between the quantum, rate based description of photon absorption by bound electrons and the classical, deterministic description of the cluster nano-plasma. Typical observables such as total energy absorption, electron and ion spectra are in very good agreement wit
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48

Georgescu, Ionut. "Rare-gas clusters in intense VUV laser fields." Doctoral thesis, Technische Universität Dresden, 2008. https://tud.qucosa.de/id/qucosa%3A24072.

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A hybrid quantum-classical approach to the interaction of atomic clusters with intense laser fields in the vacuum ultra-violet (VUV) has been developed. Much emphasis is put on localized electrons, those quasi-free electrons which localize about the ions and screen them. These electrons set a time scale, which is used to interpolate between the quantum, rate based description of photon absorption by bound electrons and the classical, deterministic description of the cluster nano-plasma. Typical observables such as total energy absorption, electron and ion spectra are in very good agreement wit
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49

Fuentes, Ronald Adrian Poma. "Localização de faltas em linhas de transmissão baseada em métodos heurísticos utilizando dados de um terminal." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-20072016-150100/.

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Este trabalho apresenta o desenvolvimento e a implementação computacional de um algoritmo para a localização de faltas em linhas de transmissão. O algoritmo proposto é baseado em métodos heurísticos, isto é, Algoritmos Genéticos (AG) e Pattern Search (PS), sendo capaz de identificar o ponto de ocorrência da falta utilizando fasores de tensão e corrente de pré e pós-falta, estimados a partir de medições disponíveis apenas no terminal local da linha de tranmsissão. Nesta abordagem, ambas as ferramentas de otimização possuem natureza heurísticas sendo menos propensas a cair em valores mínimos loc
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50

Tabella, Gianluca. "Subsea Oil Spill Risk Management based on Sensor Networks." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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This thesis consists of the evaluation of sensor-based risk management against oil spills using an underwater distributed sensor network. The work starts by highlighting the importance of having a performing leak detection system both from an environmental, safety and economic point of view. The case study is the Goliat FPSO in the Barents Sea which has to meet requirements dictated by Norwegian authorities to prevent oil spills. The modeled network is made of passive acoustic sensors monitoring the subsea manifolds. These sensors send their local 1-bit decision to a Fusion Center which takes
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