Dissertations / Theses on the topic 'Sensory synchronization'
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Cunic, Danny. "Discrimination of motor and sensory processing in human EEG by power and synchronization analysis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0024/MQ50458.pdf.
Brahimaj, Detjon. "Integrating haptic feedback in smart devices : multimodal interfaces and design guidelines." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILN002.
The growing interest in integrating haptic feedback into commercial products is a direct result of advancements in haptic technology. Notably, the proliferation of smartphones and tablets has led to the integration of haptic modalities for various interfaces.While extensive research has explored the integration of sensory modalities (visual, auditory, tactile) in passive touch, there is a relative dearth of knowledge regarding bimodality or multimodality in the context of active touch. Emerging technologies, like surface haptics, offer opportunities to investigate various aspects related to sensory integration.This work provides valuable guidelines for developers, drawing from experimental studies in the realm of active touch. Our initial investigation focuses on the temporal relationship between audio and tactile feedback, revealing a critical 200 ms threshold during sliding interactions on a haptic surface. Moreover, we identify an acceptable audio-tactile delay of 109 ms for click gestures with virtual buttons, emphasizing the need to prohibit or minimize haptic delay to less than 40 ms. A comparative study involving sighted and blind individuals unveils a crucial aspect of inclusion: adhering to synchronization boundaries of the sighted population, relative to virtual buttons, allows for the inclusive design of interfaces accommodating both populations.Additionally, we explore the impact of factors such as stereoscopy and surface deformation on the perception of texture roughness, demonstrating that their presence can alter the perceived roughness of smooth textures by over 20%.Furthermore, our research explores the potential of using vibration headphones for object localization, revealing a sensitivity of 7° for the haptic modality, 8° for auditory feedback, and 6° for audio-tactile. This highlights not only the viability of haptic feedback in virtual reality for object localization but also the improvement achieved by reinforcing the sensory experience with audio-tactile stimuli
Pallarés, Valls Oriol. "Time synchronization in underwater acoustic sensor networks." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/403876.
La sincronización temporal es una pieza clave de cualquier sistema distribuido. Las redes de sensores submarinas hacen uso de los sistemas de sincronización entre nodos para diversos servicios disponibles en cualquier red distribuida. Cabe mencionar que en las redes submarinas, las señales GPS (Global Positioning System) no están disponibles para la referencia temporal, y los sistemas de sincronización se tienen que basar principalmente en comunicaciones acústicas. Además, debido a la alta latencia de dichas redes, la portabilidad de protocolos de sincronización cableados o terrestres, es prácticamente imposible debido a las grandes diferencias de velocidades de propagación de las ondas electromagnéticas frente a las acústicas en el medio marino. Las señales acústicas se adecúan bien al medio submarino, pero presentan una serie de inconvenientes como el efecto Doppler, largas trayectorias multi-camino, además de una velocidad de transmisión baja, que han de ser corregidos en el equipo receptor. Se ha elegido el uso de "Orhtogonal Frequency-Division Multiplexing" (OFDM) como esquema de comunicaciones para el intercambio de datos entre nodos inalámbricos que tienen las bases temporales de cada uno de sus sensores. Este link de comunicaciones será usado, entre otros, para propagar los marcajes de tiempos entre mensajes necesarios para la sincronización de la red. En la literatura se pueden encontrar varios sistemas de sincronización para redes de sensores submarinas basadas en comunicación acústica como TSHL, D-SYNC, DA-Sync, pero sólo unos pocos tienen en cuenta toda la problemática del medio marino, como el bajo ancho de banda, los largos tiempos de propagación, o la movilidad de los sensores. Para resolver esta problemática de la sincronización temporal se ha empleado como referencia "Precision Time Protocol" (PTP) std. IEEE 1588, el cual es capaz de sincronizar dos relojes en una red cableada punto a punto con una precisión por debajo de los centenares de nanosegundos. Además se han empleado sistemas de mejora de la precisión temporal basados en ecuaciones cinemáticas de los nodos, tal y como se presenta en el estudio DA-Sync. En el protocolo PTP, los marcajes de tiempo se realizan en la capa física con el propósito de lograr la mayor precisión posible, ya que de este modo se evitan incertidumbres debidas a las temporizaciones de los sistemas operativos, o los algoritmos de acceso al medio. Análogamente, en esta tesis se presenta un sistema de marcaje de tiempos que extrae mediante hardware el marcaje temporal del inicio de la adquisición de datos. Difiriendo de las redes cableadas, la baja velocidad de propagación de las ondas acústicas en el medio marino hace que la comunicación sea altamente sensible al efecto Doppler, resultando en escalados frecuenciales no uniformes, que afectan a la base temporal dilatándola o comprimiéndola. Este escalado de frecuencia puede deberse a dos factores: movimiento (movimiento de sensores, variaciones del canal, etc.) o derivas del reloj de un nodo frente a otro nodo. Actualmente, para resolver este problema, algunos sistemas utilizan sistemas inerciales muy costosos para estimar el movimiento del sensor y relojes compensados por temperatura. En esta tesis se ha utilizado la información del canal respecto al escalado Doppler, además de las ecuaciones cinemáticas de primer orden, para estimar la movilidad y la deriva de los relojes. Finalmente, varios tests en laboratorio, tanque de agua, y experimentación en el mar son presentados para verificar el correcto funcionamiento de ambos sistemas de comunicación y sincronización. Los resultados validan el funcionamiento de todos los algoritmos software y del hardware, además de verificar el funcionamiento del sistema de sincronización aplicado a redes de sensores submarinas con comunicación acústica.
Yang, Ying. "Time Synchronization in Wireless Sensor Networks:A Survey." Thesis, Mittuniversitetet, Institutionen för informationsteknologi och medier, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-16986.
Luo, Bin, and 羅斌. "Distributed clock synchronization for wireless sensor networks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/198812.
published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
Deconda, Keerthi. "Fault tolerant pulse synchronization." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2331.
Johansson, Malin. "Synchronization of Acoustic Sensors in a Wireless Network." Thesis, Linköpings universitet, Datorteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157765.
Saravanos, Yanos. "Energy-Aware Time Synchronization in Wireless Sensor Networks." Thesis, University of North Texas, 2006. https://digital.library.unt.edu/ark:/67531/metadc5438/.
Ying, Yeqiu. "Synchronization and data detection in wireless sensor networks." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485187.
Han, Cheng-Yu. "Clock Synchronization and Localization for Wireless Sensor Network." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS453/document.
Wireless sensor networks (WSNs) play an important role in applications such as environmental monitoring, source tracking, and health care,... In WSN, sensors have the ability to perform data sampling, distributed computing and information fusion. To perform such complex tasks, clock synchronization and localization are two fundamental and essential algorithms. WSNs have been widely studied in the past years, and the scientific literature reports many outcomes that make them applicable for some applications. For some others, research still needs to find solutions to some of the challenges posed by battery limitation, dynamicity, and low computing clock rate. With the aim of contributing to the research on WSN, this thesis proposes new algorithms for both clock synchronization and localization. For clock synchronization, sensors converge their local physical clock to perform data fusion. By applying the clock synchronization algorithm, sensors converge the time difference and therefore work at the same rate. In view of dynamicity, low computing and sparsity of WSN, a new pulse-coupled decentralized synchronization algorithm is proposed to improve the precision of the synchronization. The benefit of this kind of algorithm is that sensors only exchange zero-bit pulse instead of packets, so not only the communication is efficient but also robust to any failure of the sensors in the network. Localization of sensors has been widely studied. However, the quality and the accuracy of the localization still have a large room to improve. This thesis apply Leave-out Sign-dominant Correlated Regions (LSCR) algorithm to localization problem. With LSCR, one evaluates the accurate estimates of confidence regions with prescribed confidence levels, which provide not only the location but also the confidence of the estimation. In this thesis, several localization approaches are implemented and compared. The simulation result shows under mild assumptions, LSCR obtains competitive results compared to other methods
Sari, Ilkay. "Joint synchronization of clock phase offset, skew and drift in reference broadcast synchronization (RBS) protocol." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1781.
Sheriff, Nathirulla. "Time Synchronization In ANT Wireless Low Power Sensor Network." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Data- och elektroteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-15068.
Leng, Mei, and 冷梅. "New advances in clock synchronization for wireless sensor networks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45880451.
Gonzalez, Sara (Sara H. ). "A framework for collecting data : revising sensor synchronization methods." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112589.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 29).
Data collection is frequently carried out in research, as well as in industry for purposes ranging from quality control to assessing system limits. However, several complications may arise to hinder optimal data collection and analysis, including synchronization of different data types from a variety of sensors. A benchtop model was designed with the primary goal of understanding human-spacesuit interactions through the collection and analysis of force, pressure, and internal kinematics data. This thesis addresses shortcomings in the setup that led to difficulty in data analysis and synchronization and presents a revised framework for collecting these data. A system was designed such that the start of each trial of data collection can be synced across the three types of sensors: a load cell, a pressure mat, and inertial measurement units.
by Sara Gonzalez.
S.B.
Nadas, João Pedro Battistella. "Energy eficiente synchronization for alarm driven wireless sensor networks." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2309.
Many applications of wireless sensor networks require that nodes, besides monitoring a given phenomenon, must be able to detect and communicate asynchronous events (e.g. alarms), implying that they have to often listen to the medium in idle mode, which is inherently energy wasteful. In such a scenario time synchronization is crucial to efficiently operate in duty-cycles and minimize energy consumption. In this work we assess the impact of the trade-off between spending energy with more frequent synchronizations and in return saving it by reducing the idle listening window necessary for the desired reliability of the communication. The optimal frequency of time synchronizations is obtained analytically and corroborated by numerical results, showing that several times less overall energy may be spent with a finer synchronization when compared with maintaining the minimum clock precision required by the phenomenon being monitored, greatly extending the life-span of the network.Furthermore, a closed form upper bound to this optimal number is derived by approximating transmit power being of much more significance when compared to receive power. Using this result, we predict and then simulate that this optimal number will be increased by the listening power, the number of times which a node has to listen to the medium idly, the level of confidence at which the system is designed to work, the synchronization interval and the variance of the relative oscillation frequency between synchronizing nodes. On the other hand, this number will be smaller when the energy cost of synchronization is higher (e.g. when active communication energy increases).
Ageev, Anton. "Time Synchronization and Energy Efficiency in Wireless Sensor Networks." Doctoral thesis, Università degli studi di Trento, 2010. https://hdl.handle.net/11572/367826.
Ageev, Anton. "Time Synchronization and Energy Efficiency in Wireless Sensor Networks." Doctoral thesis, University of Trento, 2010. http://eprints-phd.biblio.unitn.it/260/1/Ageev_PhD_Thesis.pdf.
Hult, Alfred. "Time Synchronization of TDOA Sensors Using a Local Reference Signal." Thesis, Linköpings universitet, Kommunikationssystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166744.
Noh, Kyoung Lae. "New advances in designing energy efficient time synchronization schemes for wireless sensor networks." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1493.
Kaya, Zahit Evren. "Time Synchronization In Measurement Networks." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12611585/index.pdf.
Zennaro, Davide. "Clock Synchronization in Wireless Sensor Networks: Statistical and Algorithmic Analysis." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422165.
Negli ultimi anni abbiamo assistito alla continua comparsa di applicazioni distribuite, la cui implementabilita' risulta consentita dalla possibilita' di avere a disposizione sensori piccoli ed economici. I recenti progressi tecnologici nel settore micro-elettronico-meccanico hanno infatti consentito una miniaturizzazione dei nodi sensore. La comunita' scientifica si e' oramai abituata alla possibilita', con una spesa minima, di collocare piccoli dispositivi intelligenti lungo un'area specifica. Sensori economici e a basso consumo, una volta muniti dell'hardware necessario per le telecomunicazioni, risultano ideali per l'utilizzo in reti senza infrastruttura, uno scenario in cui spicca l'assenza di un nodo centrale e la robustezza diviene quindi una proprieta' fondamentale. Monitoraggio ambientale e sorveglianza militare sono solamente un paio di esempi di applicazioni adatte a reti di sensori, cosi' come la domotica e l'ambito sanitario risultano scenari in cui l'uso di una rete distribuita di sensori puo' rivelarsi, in effetti, utile e vantaggiosa. I sensori necessitano di una base temporale comune. Questo bisogno risulta fondamentale al fine di prolungare il tempo di vita di una rete, ottimizzando schemi di accesso deterministico al mezzo, ad esempio, oppure schedulando i periodi di attivita' dei nodi in maniera precisa. La sincronizzazione risulta fondamentale anche in applicazioni legate alla localizzazione, o piu' genericamente, per permettere l'elaborazione distribuita di dati raccolti dai sensori stessi. Dal momento che la nozione di tempo locale in un sensore e' fornita da un oscillatore di bassa qualita', anche minime perturbazioni delle condizioni ambientali (come temperatura e pressione) si riflettono in modifiche nella frequenza di oscillazione del cristallo di quarzo, producendo discrepanze nel comportamento tra oscillatori in diversi sensori, che diventano non trascurabili man mano che il tempo scorre. Questa tesi affronta il problema della sincronizzazione di clock in reti di sensori, sia da una prospettiva di stima dei parametri di clock, sia da un punto di vista algoritmico lungo tutta la rete, con l'obiettivo finale di permettere ai nodi interessati di trovare una concordanza su una scala temporale comune. Nella prima parte di questa tesi viene analizzato il processo di scambio di informazioni tra due nodi chiamato two-way message exchange. Dopo aver richiamato la letteratura esistente sulla stima dei parametri del clock utilizzando questo protocollo di scambio dati attravero il canale wireless, viene introdotto un nuovo framework matematico per permettere un'assunzione piu' generale riguardo i ritardi casuali presenti nei dati raccolti. Basandosi su questo framework, viene proposto e studiato un nuovo stimatore del clock offset basato sulla teoria dei factor graphs. Dal confronto della varianza dell'errore di stima con classici limiti inferiori presenti in letteratura risulta che il nuovo stimatore proposto permette degli ottimi risultati, per cui puo' a pieno titolo essere considerato meritevole di menzione nella teoria della stima Bayesiana applicata al clock offset. La seconda parte della tesi riguarda invece la progettazione di algoritmi di consensus distribuiti per reti di sensori wireless, in special modo per operazioni di averaging svolte in maniera distribuita. Viene proposto e valutato un nuovo algoritmo di consensus velocizzato basato su alternating direction multipliers method, un metodo distribuito per risolvere problemi di minimizzazione in modo iterativo. Il nuovo algoritmo di consensus viene confrontato con lo stato dell'arte del consensus velocizzato, mostrando un'eccellente velocita' di convergenza e una resistenza al rumore migliore rispetto agli altri algoritmi presenti in letteratura. Lo schema proposto viene poi applicato al problema della sincronizzazione di clock in reti di sensori wireless, assumendo presenza di clock skew e clock offset tra i vari oscillatori della rete. L'algoritmo di sincronizzazione risultante consente un rilevante miglioramento delle prestazioni rispetto a schemi di sincronizzazione basati su consensus proposti in precedenza. Infine, nell'Appendice viene descritto un lavoro il cui argomento si discosta da quello principale della tesi: in reti cellulari in uplink, in base alla statistica del canale le stazioni base cooperanti vengono selezionate tramite l'utilizzo di tecniche iterative con l'obiettivo di garantire al terminale mobile una certa qualita' del servizio in termini di probabilta' di disservizio massima permessa e allo stesso tempo di minimizzare l'utilizzo della rete di backhaul.
Loke, Yong. "Sensor synchronization, geolocation and wireless communication in a shipboard opportunistic array." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FLoke.pdf.
Zheng, Jun. "Unified approach to time synchronization and localization in wireless sensor networks." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42841434.
Gimelli, Gabriele. "Studio e valutazione sperimentale di tecniche di sincronizzazione per reti di sensori 6LoWPAN." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15434/.
Bheemidi, Dheeraj Reddy. "A Wrapper-based Approach to Sustained Time Synchronization in Wireless Sensor Networks." Cleveland State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1231440842.
Chaudhari, Qasim Mahmood. "Estimation of clock parameters and performance benchmarks for synchronization in wireless sensor networks." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2945.
Park, Sung C. "A hybrid time synchronization algorithm based on broadcast sequencing for wireless sensor networks." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/43973.
In recent years, time synchronization has emerged as an essential research topic for wireless sensor networks. Numerous wireless network applications require a common reference time for collaborative data fusion and communications. Other time synchronization protocols have been proposed over the years, but none have eliminated the possibility of collisions associated with wireless packet transmissions while maintaining a precise level of synchronization for any given topology. In this thesis, we present a new hybrid time synchronization scheme that provides a high degree of network-wide synchronization and eliminates the possibility of collisions when transmitting timestamp messages. We propose an algorithm that allows a network to determine a broadcast sequence by which nodes transmit and forward messages and then conducts a network-wide synchronization based on received timestamp information. The proposed hybrid time synchronization scheme utilizes two existing protocols, namely relative referenceless receiver/receiver synchronization and ratio-based synchronization protocol, that provide a high degree of precision. We implement our broadcast sequencing algorithm in simulations and demonstrate its effective performance for a series of network topologies. We also present results demonstrating an improvement in network-wide synchronization using our hybrid scheme over other time synchronization protocols.
Suul, Jon Are. "Control of Grid Integrated Voltage Source Converters under Unbalanced Conditions : Development of an On-line Frequency-adaptive Virtual Flux-based Approach." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16254.
Cho, Sunghwan. "Cooperative analog and digital (CANDI) time synchronization protocol for large multi-hop networks." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42915.
Bruscato, Leandro Tavares. "Proposta de métodos de sincronização de rede de sensores sem fio." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/169790.
Environmental monitoring systems are gaining more and more space, concepts such as smart cities and the Internet of things demonstrate that this technology has been developing a lot. Consequently, many applications of this technology are being developed, many of them are dependent on wireless sensor networks, which collect data in inhospitable or difficult-to-access environments. In order to these collected data from several devices to be analyzed together it is necessary that the data collection be simultaneous or at close intervals, which implies that the entire network of sensors has a high precision in the synchronism. In addition, several wireless communication protocols use the synchronism to establish sharing of medium networks, thus having a greater efficiency in the exchange of data. Observing the importance of time synchronization, this work focuses in proposing, implementing and testing time synchronization protocols for low power wireless sensor networks using real time low frequency clocks. To implement this service, three algorithms based on different strategies are proposed to achieve the desired synchronization. The first is based on the simple metric for self-correction; the second is based on a prediction mechanism; while the third uses a more complex mechanism for analytical correction. All the algorithms have the same goal: to make the clock of the sensor nodes converge in an agile way, then to keep them with the greatest possible similarity. The objective of this work is to present the best method to guarantee the synchronization, keeping the low power consumption in a network, sporadically, transmissions. The experimental results provide evidence of success in achieving this goal, as well as providing means to compare these three approaches considering the best synchronization results and their costs in terms of energy consumption. Keywords: Internet of things.
Tonsing, Christoph Erik. "Energy-efficient MAC protocol for wireless sensor networks." Diss., University of Pretoria, 2008. http://hdl.handle.net/2263/31247.
Dissertation (MEng)--University of Pretoria, 2008.
Electrical, Electronic and Computer Engineering
MEng
Unrestricted
Dehmelt, Chris. "Integration of Smart Sensor Buses into Distributed Data Acquisition Systems." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/604924.
As requirements for the amount of test data continues to increase, instrumentation engineers are under pressure to deploy data acquisition systems that reduce the amount of associated wiring and overall system complexity. Smart sensor buses have been long considered as one approach to address this issue by placing the appropriate signal conditioners close to their respective sensors and providing data back over a common bus. However, the inability to adequately synchronize the operation of the sensor bus to the system master, which is required to correlate analog data measurements, has precluded their use. The ongoing development and deployment of smart sensor buses has reached the phase in which integration into a larger data acquisition system environment must be considered. Smart sensor buses, such as IntelliBus™, have their own unique mode of operation based on a pre-determined sampling schedule, which however, is typically asynchronous to the operation of the (master or controller) data acquisition system and must be accounted for when attempting to synchronize the two systems. IRIG Chapter 4 type methods for inserting data into a format, as exemplified by the handling of MIL-STD-1553 data, could be employed, with the disadvantage of eliminating any knowledge as to when a particular measurement was sampled, unless it is time stamped (similar to the time stamping function that is provided to mark receipt of 1553 command words). This can result in excessive time data as each sensor bus can manage a large number of analog sensor inputs and multiple sensor buses must be accommodated by the data acquisition system. The paper provides an example, using the Boeing developed IntelliBus system and the L3 Communications - Telemetry East NetDAS system, of how correlated data can be acquired from a smart sensor bus as a major subsystem component of a larger integrated data acquisition system. The focus will be specifically on how the IntelliBus schedule can be synchronized to that of the NetDAS formatter. Sample formats will be provided along with a description of how a standalone NetDAS stack and an integrated NetDAS-IntelliBus system would be programmed to create the required output, taking into account the unique sampling characteristics of the sensor bus.
García, Pineda Miguel. "A group-based architecture and protocol for wireless sensor networks." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/27599.
García Pineda, M. (2013). A group-based architecture and protocol for wireless sensor networks [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/27599
TESIS
Premiado
Martirosyan, Anahit. "Towards Design of Lightweight Spatio-Temporal Context Algorithms for Wireless Sensor Networks." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19857.
Zhang, Boyang. "Real-time software-defined-radio implementation of time-slotted carrier synchronization for distributed beamforming." Worcester, Mass. : Worcester Polytechnic Institute, 2009. http://www.wpi.edu/Pubs/ETD/Available/etd-050509-200154/.
Keywords: distributed beamforming; carrier synchronization; software-defined-radio; sensor networks; wireless networks; cooperative transmission; virtual antenna arrays. Includes bibliographical references (leaves 168-169).
Ostrander, Charles Nicholas. "Phase alignment of asynchronous external clock controllable devices to periodic master control signal using the Periodic Event Synchronization Unit." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/ostrander/OstranderC0509.pdf.
Orhan, Ibrahim. "Performance Monitoring and Control in Wireless Sensor Networks." Licentiate thesis, KTH, Data- och elektroteknik (Stängd 20130701), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-94545.
QC 20120529
Salustiano, Rogerio Esteves 1978. "Núcleo de simulação computacional baseado na sincronização por barreiras com aplicação em redes de sensores sem fio." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260659.
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: O principal objetivo deste trabalho é a proposta e a implementação de um núcleo de simulação do tipo event-driven baseado em agentes destinado ao estudo e previsão de desempenho de Redes de Sensores Sem Fio. O núcleo de simulação, BaSS ¿ Barrier Synchronization Simulator, foi desenvolvido a partir do modelo básico de sincronização por barreiras, cujas funcionalidades foram ampliadas com a inclusão de temporização e interrupção nos eventos de sincronização, sendo esta a contribuição mais relevante do trabalho. Sendo parte de um projeto com metas mais ambiciosas, em particular a busca de estruturas de Redes de Sensores Sem Fio mais eficientes, contando para isto com o envolvimento de múltiplas expertises, dentre as quais projeto de circuitos integrados, eficiência energética e protocolos de comunicação, o presente trabalho foi motivado pela necessidade de uma ferramenta de simulação suficientemente flexível para acomodar os dispositivos que estariam sendo desenvolvidos e usados nas novas Redes de Sensores Sem Fio. Como resultado, considera-se que os frutos tangíveis deste trabalho são: primeiro, um framework que pode ser utilizado no desenvolvimento de simuladores do tipo event-driven com aplicações diversas e, segundo, um simulador com aplicação específica em Redes de Sensores Sem Fio, que permite a modelagem comportamental dos seus elementos, tais como as propriedades dos sensores, as características de transmissão e recepção e as cargas das baterias. O simulador tem uma interface gráfica que permite a visualização dinâmica da rede e a inclusão de recursos de avaliação e controle da simulação
Abstract: The main objective of this work is the proposal and the implementation of an event-driven simulation kernel based on agents for the study and performance prediction of Wireless Sensor Networks The simulation kernel, BaSS - Barrier Synchronization Simulator, was developed based on the barrier synchronization model, whose features were expanded with the inclusion of interruptions and timers in the synchronization of events, which is the most important contribution of this work. As a part of a project with more ambitious purposes, particularly pursuing the development of more efficient wireless sensor networks, counting for this with the involvement of diverse expertises, including design of integrated circuits, energy efficiency and communication protocols, the herein presented work was motivated by the need of a flexible simulation tool to accommodate the devices that would be developed and used in the new wireless sensor networks. As a result, it is understood that the tangible contributions of this work are: first, a framework that can be used in the development of any kind of event-driven simulators and, second, a simulator with a specific application in Wireless Sensor Networks, which allows the behavioural modelling of their elements, such as sensors proprieties, transmission and reception characteristics and batteries charges. The simulator has a graphical interface that allows the dynamic visualization of the network and the use of evaluation resources and controls of the simulation
Doutorado
Eletrônica, Microeletrônica e Optoeletrônica
Doutor em Engenharia Elétrica
Karlsson, Leif. "Time-synchronized wireless mesh networks using battery-powered nodes." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-75050.
Taha, Abu Snaineh Sami. "AUTOMATIC PERFORMANCE LEVEL ASSESSMENT IN MINIMALLY INVASIVE SURGERY USING COORDINATED SENSORS AND COMPOSITE METRICS." UKnowledge, 2013. http://uknowledge.uky.edu/cs_etds/12.
Yang, Jue. "Design and Implementation of Large-Scale Wireless Sensor Networks for Environmental Monitoring Applications." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc28493/.
Lopes, Sérgio Ivan Fernandes. "In search of reliable centimeter-level indoor positioning: a smartphone-based approach." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14100.
This thesis describes the design and implementation of a reliable centimeter-level indoor positioning system fully compatible with a conventional smartphone. The proposed system takes advantage of the smartphone audio I/O and processing capabilities to perform acoustic ranging in the audio band using non-invasive audio signals and it has been developed having in mind applications that require high accuracy, such as augmented reality, virtual reality, gaming and audio guides. The system works in a distributed operation mode, i.e. each smartphone is able to obtain its own position using only acoustic signals. To support the positioning system, a Wireless Sensor Network (WSN) of synchronized acoustic beacons is used. To keep the infrastructure in sync we have developed an Automatic Time Synchronization and Syntonization (ATSS) protocol with a standard deviation of the sync offset error below 1.25 μs. Using an improved Time Difference of Arrival (TDoA) estimation approach (which takes advantage of the beacon signals’ periodicity) and by performing Non-Line-of-Sight (NLoS) mitigation, we were able to obtain very stable and accurate position estimates with an absolute mean error of less than 10 cm in 95% of the cases and a mean standard deviation of 2.2 cm for a position refresh period of 350 ms.
Esta tese descreve o projeto e a implementação de um sistema de localização para ambientes interiores totalmente compatível com um smartphone convencional. O sistema proposto explora a capacidade de aquisição de sinais áudio e de processamento do smartphone para medir distâncias utilizando sinais acústicos na banda do audível; foram utilizados sinais áudio não-invasivos, i.e. com reduzido impacto perceptual em humanos. No desenvolvimento deste sistema foram consideradas aplicações que exigem elevada exatidão, na ordem dos centímetros, tais como realidade aumentada, realidade virtual, jogos ou guias virtuais. Utilizou-se uma infraestrutura de faróis de baixo custo suportada por uma rede de sensores sem fios (RSSF). Para manter a infraestrutura síncrona, foi desenvolvido um protocolo de sincronização e sintonização automática, (Automatic Time Synchronization and Syntonization - ATSS) que garante um desvio padrão do erro de offset abaixo de 1.25 μs. Cada smartphone efectua medidas MT-TDoA que posteriormente são utilizadas pelo algoritmo de localização hiperbólica. As estimativas de posição resultantes são estáveis e precisas, com um erro médio absoluto menor do que 10 cm em 95% dos casos e um desvio padrão médio de 2.2 cm, para um período de atualização de posição de 350 ms.
Zhang, Xiaohu. "VHF & UHF energy harvesting radio system physical and MAC layer considerations." Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1435.
Cridland, Doug, and Chris Dehmelt. "LONG TERM VEHICLE HEALTH MONITORING." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604406.
While any vehicle that is typically part of a flight test campaign is heavily instrumented to validate its performance, long term vehicle health monitoring is performed by a significantly reduced number of sensors due to a number of issues including cost, weight and maintainability. The development and deployment of smart sensor buses has reached a time in which they can be integrated into a larger data acquisition system environment. The benefits of these types of buses include a significant reduction in the amount of wiring and overall system complexity by placing the appropriate signal conditioners close to their respective sensors and providing data back over a common bus, that also provides a single power source. The use of a smart-sensor data collection bus, such as IntelliBus™1 or IEEE-1451, along with the continued miniaturization of signal conditioning devices, leads to the interesting possibility of permanently embedding data collection capabilities within a vehicle after the initial flight test effort has completed, providing long-term health-monitoring and diagnostic functionality that is not available today. This paper will discuss the system considerations and the benefits of a smart sensor based system and how pieces can be transitioned from flight qualification to long-term vehicle health monitoring in production vehicles.
Meghji, Mahir Lumumba. "On a Joint Physical Layer and Medium Access Control Sublayer Design for Efficient Wireless Sensor Networks and Applications." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2013. https://ro.ecu.edu.au/theses/590.
Ferrigo, Samuel Francisco. "Momicare: um middleware móvel para smartphones para gerenciamento de uma rede de sensores sem fio corporais." Universidade do Vale do Rio dos Sinos, 2017. http://www.repositorio.jesuita.org.br/handle/UNISINOS/6631.
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A Internet das Coisas, ou simplesmente IoT, apresenta inúmeras soluções para a área da saúde. Diversos sensores podem ser colocados ao redor do corpo humano para monitoramento de seus sinais vitais e, a partir disso, prever problemas de saúde. Gerenciar esses sensores apresenta uma série de desafios que não são resolvidos pelos trabalhos relacionados pesquisados, como a busca pela eficiência energética na transmissão de dados, a segurança, a interoperabilidade e sincronização entre sensores que formam uma rede de sensores sem fio corporais. Uma solução para estes problemas é apresentada pelo modelo MOMICARE, um middleware móvel para smartphones para gerenciamento de uma rede de sensores sem fio corporais. O MOMICARE permite que um smartphone receba dados de diversos sensores, armazene-os e retransmita-os às aplicações médicas que necessitem usar esses dados, oferecendo baixo consumo de energia, segurança, independência de protocolos de redes de sensores sem fios e sincronismo entre os dados coletados pelos sensores. As principais contribuições científicas deste trabalho são a redução do consumo energético de dispositivos que formam uma rede Wireless Body Area Network, e o oferecimento de um sincronismo temporal entre os dados desses dispositivos. O modelo foi analisado por meio da implementação de um protótipo e um ambiente de simulação, onde foram realizadas avaliações de: (1) consumo de energia dos dispositivos da rede Wireless Body Area Network, (2) sincronização entre os dispositivos e o middleware, e (3) carga sobre o dispositivo onde o protótipo foi executado, considerando o uso de diversas aplicações simultâneas. Como resultados obtidos, verificou-se que, em dispositivos Bluetooth Low Energy, a redução no consumo de energia superou 10% em relação a aplicações convencionais, enquanto que em dispositivos padrão IEEE 802.15.4 a redução no consumo energético chegou a até 7,8%, quando comparado ao uso de aplicações convencionais. Outro resultado obtido foi a variação de sincronização inferior a 0,5 segundos, valores aceitáveis no que diz respeito a dispositivos médicos. Por fim, em todos os testes realizados, não foi verificado qualquer tipo de sobrecarga, sendo que a média de uso do processador apresentou valores médios inferiores a 1%.
The Internet of Things, or simply IoT, presents numerous solutions for the health area. Several sensors can be placed around the human body to monitor your vital signs and, from there, predict health problems. Managing these sensors presents a number of challenges that are not resolved by related research, such as the search for energy efficiency in data transmission, security, interoperability and synchronization between sensors that form a network of wireless body sensors. One solution to these problems is presented by the MOMICARE model, a mobile middleware for smartphones for managing a network of wireless body sensors. MOMICARE allows a smartphone to receive data from multiple sensors, store and re-transmit it to medical applications that need to use that data, offering low power consumption, security, wireless sensor network protocol independence and synchronization between data collected by sensors. The main scientific contributions of this work are the reduction of the energy consumption of devices that form a Wireless Body Area Network, and the offer of a temporal synchronism between the data of these devices. The model was analyzed through the implementation of a prototype and simulation environment, where evaluations were made of: (1) energy consumption ofWireless Body Area Network devices, (2) synchronization between devices and middleware, and 3) load on the device where the prototype was executed, considering the use of several simultaneous applications. As results obtained, it has been found that in Bluetooth Low Energy devices, the reduction in energy consumption exceeded 10% compared to conventional applications, whereas in standard devices IEEE 802.15.4 reduction in energy consumption reached up to 7.8%, when compared to the use of conventional applications. Another result obtained was the synchronization variation less than 0.5 seconds, acceptable values with respect to medical devices. Finally, in all the tests performed, no type of overload was verified, and the average use of the processor presented average values lower than 1%.
Nguyen, Theanh. "SHM through flexible vibration sensing technologies and robust safety evaluation paradigm." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/78632/5/Andy%20Nguyen%20Thesis.pdf.
Fiorilli, Luca. "Identificazione strutturale mediante l’algoritmo "Stochastic Subspace Identification - SSI"." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Boem, Francesca. "Distributed Methods for Estimation and Fault Diagnosis: the case of Large-scale Networked Systems." Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8534.
L’obiettivo di questa tesi è il monitoraggio di sistemi complessi a larga-scala. L’importanza di questo argomento è dovuto alla rinnovata enfasi data alle problematiche riguardanti la sicurezza e l’affidabilità dei sistemi, diventate requisiti fondamentali nella progettazione. Infatti, la crescente complessità dei moderni sistemi, dove le relazioni fra i diversi componenti, con il mondo esterno e con il fattore umano sono sempre più importanti, implica una crescente attenzione ai rischi e ai costi dovuti ai guasti e lo sviluppo di approcci nuovi per il controllo e il monitoraggio. Mentre nel contesto centralizzato i problemi di stima e di diagnostica di guasto sono stati ampiamente studiati, lo sviluppo di metodologie specifiche per sistemi distribuiti, larga scala o “networked”, come i Cyber-Physical Systems e i Systems-of-Systems, è cominciato negli ultimi anni. Il sistema fisico è rappresentato come l’interconnessione di sottosistemi ottenuti attraverso una decomposizione del sistema complesso dove le sovrapposizioni sono consentite. L’approccio si basa sul modello dinamico non-lineare dei sottosistemi e sull’approssimazione adattativa delle non note interconnessioni fra i sottosistemi. La novità è la proposta di un’architettura unica che tenga conto dei molteplici aspetti che costituiscono i sistemi moderni, integrando il sistema fisico, il livello sensoriale e il sistema di diagnostica e considerando le relazioni fra questi ambienti e le reti di comunicazione. In particolare, vengono proposte delle soluzioni ai problemi che emergono dall’utilizzo di reti di comunicazione e dal considerare sistemi distribuiti e networked. Il processo di misura è effettuato da un insieme di reti di sensori, disaccoppiando il livello fisico da quello diagnostico e aumentando in questo modo la scalabilità e l’affidabilità del sistema diagnostico complessivo. Un nuovo metodo di stima distribuita per reti di sensori è utilizzato per filtrare le misure minimizzando sia la media sia la varianza dell’errore di stima attraverso la soluzione di un problema di ottimizzazione di Pareto. Un metodo per la re-sincronizzazione delle misure è proposto per gestire sistemi multi-rate e misure asincrone e per compensare l’effetto dei ritardi nella rete di comunicazione fra sensori e diagnostici. Poiché uno dei problemi più importanti quando si considerano sistemi distribuiti e reti di comunicazione è per l’appunto il verificarsi di ritardi di trasmissione e perdite di pacchetti, si propone una strategia di compensazione dei ritardi , basata sull’uso di Time Stamps e buffer e sull’introduzione di una matrice di consenso tempo-variante, che permette di gestire il problema dei ritardi nella rete di comunicazione fra diagnostici. Gli schemi distribuiti per la detection e l’isolation dei guasti sono sviluppati, garantendo la convergenza degli stimatori e derivando le condizioni sufficienti per la detectability e l’isolability. La matrice tempo-variante proposta permette di migliorare queste proprietà definendo delle soglie meno conservative. Alcuni risultati sperimentali provano l’efficacia del metodo proposto. Infine, le architetture distribuite per la detection e l’isolation, sviluppate nel caso tempo-discreto, sono estese al caso tempo continuo e nello scenario in cui lo stato non è completamente misurabile, sia a tempo continuo che a tempo discreto.
This thesis deals with the problem of the monitoring of modern complex systems. The motivation is the renewed emphasis given to monitoring and fault-tolerant systems. In fact, nowadays reliability is a key requirement in the design of technical systems. While fault diagnosis architectures and estimation methods have been extensively studied for centralized systems, the interest towards distributed, networked, large-scale and complex systems, such as Cyber-Physical Systems and Systems-of-Systems, has grown in the recent years. The increased complexity in modern systems implies the need for novel tools, able to consider all the different aspects and levels constituting these systems. The system being monitored is modeled as the interconnection of several subsystems and a divide et impera approach allowing overlapping decomposition is used. The local diagnostic decision is made on the basis of the knowledge of the local subsystem dynamic model and of an adaptive approximation of the uncertain interconnection with neighboring subsystems. The goal is to integrate all the aspects of the monitoring process in a comprehensive architecture, taking into account the physical environment, the sensor layer, the diagnosers level and the communication networks. In particular, specifically designed methods are developed in order to take into account the issues emerging when dealing with communication networks and distributed systems. The introduction of the sensor layer, composed by a set of sensor networks, allows the decoupling of the physical and the sensing/computation topologies, bringing some advantages, such as scalability and reliability of the diagnosis architecture. We design the measurements acquisition task by proposing a distributed estimation method for sensor networks, able to filter measurements so that both the variance and the mean of the estimation error are minimized by means of a Pareto optimization problem. Moreover, we consider multi-rate systems and non synchronized measurements, having in mind realistic applications. A re-synchronization method is proposed in order to manage the case of multi-rate systems and to compensate delays in the communication network between sensors and diagnosers. Since one of the problems when dealing with distributed, large-scale or networked systems and therefore with a communication network, is inevitably the presence of stochastic delays and packet dropouts, we propose therefore a distributed delay compensation strategy in the communication network between diagnosers, based on the use of Time Stamps and buffers and the definition of a time-varying consensus matrix. The goal of the novel time-varying matrix is twofold: it allows to manage communication delays, packet dropouts and interrupted links and to optimize detectability and isolability skills by defining less conservative thresholds. The distributed fault detection and isolation schemes are studied and analytical results regarding fault detectability, isolability and estimator convergence are derived. Simulation results show the effectiveness of the proposed architecture. For the sake of completeness, the monitoring architecture is studied and adapted to different frameworks: the fault detection and isolation methodology is extended for continuous-time systems and the case where the state is only partially measurable is considered for discrete-time and continuous-time systems.
XXV Ciclo
1985
Řezáč, Martin. "Podpůrné algoritmy pro řízení elektrických motorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221272.