Дисертації з теми "Feedback Rate"
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Solanes, Galbis Juan Ernesto. "MULTI-RATE VISUAL FEEDBACK ROBOT CONTROL." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/57951.
Повний текст джерела[ES] La presente tesis propone soluciones para dos problemas característicos de los sistemas robóticos cuyo bucle de control se cierra únicamente empleando sensores de visión artificial: 1) la latencia del sensor; 2) la obtención de trayectorias factibles tanto para el robot así como para las medidas obtenidas en la imagen. Todos los métodos propuestos en este trabajo son analizados, validados e implementados utilizando brazo robot industrial de 6 grados de libertad y/o en un robot con ruedas. Atendiendo al problema de la latencia del sensor, esta tesis propone el uso de retenedores bi-frequencia de orden alto dentro de los lazos de control de robots. En este aspecto las principales contribuciones son: -Retenedores bi-frecuencia de orden alto basados en funciones primitivas dentro de lazos de control de robots (Capítulo 3): análisis del comportamiento del sistema con y sin el uso de esta técnica de control no convencional. Además, como consecuencia del empleo de los retenedores, obtención y validación de controladores multi-frequencia, concretamente de PIDs bi-frecuencia. -Retenedores bi-frecuencia asíncronos de orden alto basados en funciones primitivas con compensación de retardos (Capítulo 3): generalización de los retenedores bi-frecuencia asíncronos de orden alto incluyendo una componente de compensación del retardo en la señal de entrada, mejorando así las estimaciones inter-muestreo calculadas por el retenedor. Se proporciona un análisis de las propiedades de los retenedores con compensación del retardo, comparándolas con las obtenidas por sus predecesores sin compensación, así como su implementación y validación en un brazo robot de 6 grados de libertad. -Retenedores multi-frecuencia no lineales de orden alto (Capítulo 4): generalización del concepto de retenedor bi-frecuencia de orden alto con modelos de estimación no lineales, los cuales incluyen información tanto de la planta a controlar, como del controlador(es) y sensor(es) empleado(s), obtenida a partir de técnicas de aprendizaje. Así pues, para obtener dicho retenedor no lineal, se describe una metodología independiente de la herramienta de aprendizaje utilizada, aunque validada con el uso de redes neuronales artificiales. Finalmente se realiza un análisis de las propiedades de estos nuevos retenedores, comparándolos con sus predecesores basados en funciones primitivas, así como su implementación y validación en un brazo robot de 6 grados de libertad y en un robot móvil con ruedas. Por lo que respecta al problema de generación de trayectorias factibles para el robot y para la medida en la imagen, esta tesis propone la nueva estrategia de control basada en el filtrado de la referencia y su generalización desde el punto de vista multi-frecuencial. -Estrategia de control basada en el filtrado de la referencia (Capítulo 5): una nueva estrategia de control se propone para ampliar significativamente el espacio de soluciones de los sistemas robóticos realimentados con sensores de visión artificial. La principal idea es utilizar las trayectorias óptimas obtenidas por una trayectoria predicha por un filtro de Kalman seguido de un suavizado basado en el algoritmo Rauch-Tung-Striebel (RTS) como nuevas referencias para un controlador dado. En este trabajo se proporciona tanto la descripción del algoritmo como su implementación y validación empleando un brazo robótico industrial. -Estrategia de control bi-frecuencia basada en el filtrado de la referencia (Capítulo 5): generalización de la estrategia de control basada en filtrado de la referencia desde un punto de vista multi-frecuencial, con un filtro de Kalman multi-frecuencia y un Kalman-smoother dual basado en la relación existente entre las frecuencias del sensor y del controlador, reduciendo así el coste computacional del algoritmo y, al mismo tiempo, dando solución al problema de la latencia del sensor. La validación se realiza utilizando un barzo robot industria asi
[CAT] La present tesis proposa solucions per a dos problemes característics dels sistemes robòtics el els que el bucle de control es tanca únicament utilitzant sensors de visió artificial: 1) la latència del sensor; 2) l'obtenció de trajectòries factibles tant per al robot com per les mesures en la imatge. Tots els mètodes proposats en aquest treball son analitzats, validats e implementats utilitzant un braç robot industrial de 6 graus de llibertat i/o un robot amb rodes. Atenent al problema de la latència del sensor, esta tesis proposa l'ús de retenidors bi-freqüència d'ordre alt a dins del llaços de control de robots. Al respecte, les principals contribucions son: - Retenidors bi-freqüència d'ordre alt basats en funcions primitives a dintre dels llaços de control de robots (Capítol 3): anàlisis del comportament del sistema amb i sense l'ús d'aquesta tècnica de control no convencional. A més a més, com a conseqüència de l'ús dels retenidors, obtenció i validació de controladors multi-freqüència, concretament de PIDs bi-freqüència. - Retenidors bi-freqüència asíncrons d'ordre alt basats en funcions primitives amb compensació de retards (Capítol 3): generalització dels retenidors bi-freqüència asíncrons d'ordre alt inclouen una component de compensació del retràs en la senyal d'entrada al retenidor, millorant així les estimacions inter-mostreig calculades per el retenidor. Es proporciona un anàlisis de les propietats dels retenidors amb compensació del retràs, comparant-les amb les obtingudes per el seus predecessors sense la compensació, així com la seua implementació i validació en un braç robot industrial de 6 graus de llibertat. - Retenidors multi-freqüència no-lineals d'ordre alt (Capítol 4): generalització del concepte de retenidor bi-freqüència d'ordre alt amb models d'estimació no lineals, incloent informació tant de la planta a controlar, com del controlador(s) i sensor(s) utilitzat(s), obtenint-la a partir de tècniques d'aprenentatge. Així doncs, per obtindre el retenidor no lineal, es descriu una metodologia independent de la ferramenta d'aprenentatge utilitzada, però validada amb l'ús de rets neuronals artificials. Finalment es realitza un anàlisis de les propietats d'aquestos nous retenidors, comparant-los amb els seus predecessors basats amb funcions primitives, així com la seua implementació i validació amb un braç robot de 6 graus de llibertat i amb un robot mòbil de rodes. Per el que respecta al problema de generació de trajectòries factibles per al robot i per la mesura en la imatge, aquesta tesis proposa la nova estratègia de control basada amb el filtrat de la referència i la seua generalització des de el punt de vista multi-freqüència. - Estratègia de control basada amb el filtrat de la referència (Capítol 5): una nova estratègia de control es proposada per ampliar significativament l'espai de solucions dels sistemes robòtics realimentats amb sensors de visió artificial. La principal idea es la d'utilitzar les trajectòries optimes obtingudes per una trajectòria predita per un filtre de Kalman seguit d'un suavitzat basat en l'algoritme Rauch-Tung-Striebel (RTS) com noves referències per a un control donat. En aquest treball es proporciona tant la descripció del algoritme així com la seua implementació i validació utilitzant un braç robòtic industrial de 6 graus de llibertat. - Estratègia de control bi-freqüència basada en el filtrat (Capítol 5): generalització de l'estratègia de control basada am filtrat de la referència des de un punt de vista multi freqüència, amb un filtre de Kalman multi freqüència i un Kalman-Smoother dual basat amb la relació existent entre les freqüències del sensor i del controlador, reduint així el cost computacional de l'algoritme i, al mateix temps, donant solució al problema de la latència del sensor. L'algoritme d'implementació d'aquesta tècnica, així com la seua validaci
Solanes Galbis, JE. (2015). MULTI-RATE VISUAL FEEDBACK ROBOT CONTROL [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/57951
TESIS
Roh, June Chul. "Multiple-antenna communication systems with finite rate feedback /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3167845.
Повний текст джерелаGoodie, Jeffrey L. "Transfer of heart rate feedback training to reduce heart rate response to laboratory tasks." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2118.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains vii, 123 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 59-66).
Farajian, Patrick. "Dynamic input rate control in queues with feedback delay." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26386.
Повний текст джерелаWalker, Vennessa L. "Effects of rate of feedback and reinforcement on novel responding." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5954.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains iv, 75 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 37-42).
Lassell, Deborah Deanna. "Heart rate monitor feedback and children's levels of physical activity /." view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1283960311&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.
Повний текст джерелаTypescript. Includes vita and abstract. Includes bibliographical references (leaves 111-116). Also available for download via the World Wide Web; free to University of Oregon users.
Dai, Wei. "Communications with finite rate feedback and quantization on Grassmann manifolds." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3273722.
Повний текст джерелаSyed, Shah Nemath Farhan. "IMPLEMENTATION OF INTERACTIVE REMOTE PHYSIOLOGICAL MONITORING AND FEEDBACK TRAINING SYSTEM." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1164666232.
Повний текст джерелаTorrellas, Socastro Marc. "Transmission strategies for interfering networks with finite rate and outdated channel feedback." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/392617.
Повний текст джерелаLa aparición de terminales móviles cada vez más potentes, e.g. smartphones o tablets, ha incrementado dramáticamente la demanda de tráfico de datos en redes inalámbricas en los últimos años. Las previsiones de crecimiento ya avisan que los estándares de comunicación actuales no serán capaces de sostener las demandas de tráfico en un futuro, por lo que se está investigando como aumentar la eficiencia de las redes inalámbricas. La tecnología MIMO, es decir, el uso de múltiples antenas, destaca como uno de los candidatos, permitiendo no sólo aumentar la fiabilidad y robustez (ganancia de diversidad), sino también la eficiencia de la comunicación (ganancia de multiplexado o grados de libertad (DoF)). Los DoF describen la pendiente de la capacidad del canal a muy alta relación señal a ruido (SNR), y para el canal punto a punto (P2P) son igual al mínimo entre el número de antenas en transmisión y recepción. Así pues, el rendimiento de la comunicación inalámbrica se escala de forma muy prometedora. Esta tesis aporta contribuciones en el conocimiento de los DoF para comunicaciones con interferencia (debido a que se sirven múltiples usuarios), cuyo comportamiento es aún un problema por resolver. La forma más trivial de abordar este problema es ortogonalizando las transmisiones, ya sea en tiempo, frecuencia o espacio. Sin embargo, no permite que los DoF escalen con el número de usuarios. Por ejemplo, si se ortogonaliza en tiempo, cada usuario se sirve sólo una fracción de tiempo inversamente proporcional a la cantidad de usuarios. Asimismo, si se ortogonaliza en espacio, se requerirán muchas antenas transmisoras, lo cual es costoso y poco práctico. La técnica de alineación de interferencia (IA) propone que en lugar de diseñar la transmisión para anular la interferencia en los receptores, estos observen todos los términos solapados. Esto permite reducir el espacio ocupado por interferencia, ensanchar el espacio de señales deseadas, pudiendo enviar más símbolos por usuario, y reducir el número de antenas requeridas. Así, IA permitió demostrar que los DoF escalan para el canal interferente con terminales equipado con una sola antena. Al principio, se suponía que los transmisores disponían de toda la información del estado del canal instantáneamente, y con calidad perfecta (CSIT completo). La primera parte de la tesis estudia este caso, y completa la caracterización de los DoF del canal interferente MIMO de 3 usuarios para ciertas configuraciones de antenas, cuando los coeficientes del canal son constantes en tiempo. En la práctica, el CSIT se debe obtener mediante reportes del canal, lo que conlleva retrasos y errores. En este contexto, y sobre todo dirigido a escenarios con alta movilidad, los conceptos de IA se extendieron al caso donde sólo está disponible información obsoleta del canal (delayed CSIT), e.g. cuando el retardo de los reportes es mayor el tiempo de coherencia del canal. Esta forma de IA se denota como retrospective IA, ya que la transmisión se lleva a cabo en múltiples fases, y las señales pueden ser alineadas a lo largo del espacio y las diferentes fases. La segunda parte de la tesis estudia los DoF de dos topologías de red con delayed CSIT, proponiendo estrategias de transmisión. Además, se demuestra que las estrategias propuestas superan el estado del arte en términos del compromiso DoF-retardo, lo que es relevante ya que la mayoría de las estrategias basadas en delayed CSIT requieren muchos usos de canal. Finalmente, la última parte de la tesis describe cómo uno de los esquemas propuestos en la segunda parte trabaja con errores, y en términos de net DOF. Este último indicador describe los DoF en función del tiempo de coherencia, y teniendo en cuenta todas las cuestiones relacionadas con la adquisición del canal, tanto en el transmisor como en el receptor: el consumo de los recursos para estimar el canal en recepción , para la transmisión de los reportes de canal, y las esperas hasta obtener los reportes.
Sigman, A. "The roles of attention in hypnotic and feedback control of heart rate." Thesis, University of East London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376106.
Повний текст джерелаCharny, Anna. "An algorithm for rate allocation in a packet-switching network with feedback." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12000.
Повний текст джерелаWood, Kieran Thomas. "Control strategy for MAVs with delayed, low rate monocular visual SLAM feedback." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687191.
Повний текст джерелаArvai, Amanda. "Vision-based navigation using multi-rate feedback from optic flow and scene reconstruction." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0013261.
Повний текст джерелаSiraj, Tazeen. "Event Rate as a Moderator Variable for Vigilance: Implications for Performance-Feedback and Stress." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1191856419.
Повний текст джерелаBabin, Paul D. "Simulation modeling and analysis of adjustable service-rate queueing models that incorporate feedback control." Thesis, Mississippi State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3737172.
Повний текст джерелаResearch shows that in a system model, when the production rate is adjusted based on the number of items in queue, the nature of the model changes from an open-loop queueing system to a closed-loop feedback control system. Service-rate adjustment can be implemented in a discrete event simulation model, but the effect of this adjustment has not been thoroughly analyzed in the literature. This research considers the design of feedback signals to generate realistic simulation models of production system behavior. A series of simulation experiments is conducted to provide practical guidance for simulation modelers on how adding a service-rate adjustment feedback loop to a queueing system affects system performance.
Bauer, Shelby E. "Written and Verbal Feedback: Comparative Effects on Rate of Behavior-Specific Praise in theClinical Setting." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1596036074087292.
Повний текст джерелаElton, Mark David. "Matching feedback with operator intent for efficient human-machine interface." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50152.
Повний текст джерелаPocock, Trudy Louise. "An Analysis of Precision teaching." The University of Waikato, 2006. http://hdl.handle.net/10289/2622.
Повний текст джерелаWickert, Mark, Shaheen Samad, and Bryan Butler. "AN ADAPTIVE BASEBAND EQUALIZER FOR HIGH DATA RATE BANDLIMITED CHANNELS." International Foundation for Telemetering, 2006. http://hdl.handle.net/10150/604050.
Повний текст джерелаMany satellite payloads require wide-band channels for transmission of large amounts of data to users on the ground. These channels typically have substantial distortions, including bandlimiting distortions and high power amplifier (HPA) nonlinearities that cause substantial degradation of bit error rate performance compared to additive white Gaussian noise (AWGN) scenarios. An adaptive equalization algorithm has been selected as the solution to improving bit error rate performance in the presence of these channel distortions. This paper describes the design and implementation of an adaptive baseband equalizer (ABBE) utilizing the latest FPGA technology. Implementation of the design was arrived at by first constructing a high fidelity channel simulation model, which incorporates worst-case signal impairments over the entire data link. All of the modem digital signal processing functions, including multirate carrier and symbol synchronization, are modeled, in addition to the adaptive complex baseband equalizer. Different feedback and feed-forward tap combinations are considered as part of the design optimization.
Newman, Jonathan P. "Optogenetic feedback control of neural activity." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52973.
Повний текст джерелаBica, Gustavo Alexandre da Fonseca Madeira Lopes. "Can you feel the spiders: haptic feedback on virtual reality." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23581.
Повний текст джерелаAnxiety disorders are the most common mental health problem in the world and it affects, on daily basis, a vast number of people all around the world. Even though there are a high number of people suffering from phobia, only a small percentage ever seeks treatment, usually sufferers avoid the source of the problem, even if it is meaning of constrains in daily and social activities. Due to the development and creation of new technologies with the focus on healthcare growing rapidly and a number of studies proving that virtual reality can be just as effective as in vivo exposure, while providing a less stressful experience, these findings can contribute to reduce the high number of people that never seeks treatment. In previous works of our group, the Veracity, virtual reality was already applied in the context of arachnophobia, an example of specific phobias as a mean to provide an exposure without any physical sensorial interaction. In this dissertation, we want to extend the system with a virtual haptic response when touching spiders. Although the use of haptic response has been used and it is being used successfully in other areas, to our knowledge this is a novelty in the relation to other works in the phobia treatment. The haptic feedback has impact in virtual spider’s level of realism/interaction, by adding the touch to the visual sensation. Through haptic feedback, while improving the realism, we aimed at maintaining the virtual experience "safe" in the phobic user perspective in comparison to in vivo exposure. In this work, we integrated the haptic feedback within the Veracity loop and evaluate the impact in the response of users to this new add-on. As in the original system we still collect physiological response of the users such as ECG, HR, Video and 3D tracking of Virtual objects that were used to compare the responses with and without haptic feedback. The preliminary evaluation of the system suggest that this approach is interesting to pursue but still need a more comprehensive evaluation to assert its usefulness and impact within the phobic users of the haptic feedback.
Os distúrbios de ansiedade são uma das doenças mentais mais comuns no mundo, afetando o quotidiano de um elevado número de pessoas. Embora exista um número significativo de pessoas que têm algum tipo de distúrbio de ansiedade, apenas uma pequena percentagem procura tratamento, preferindo simplesmente evitar a fonte da sua fobia, tendo como consequência a privação de momentos/atividades diárias. Com o rápido desenvolvimento e aparecimento de novas tecnologias, o número de soluções tecnológicas focadas em saúde tem vindo a crescer, juntamente com um número de estudos que demonstram que a realidade virtual permite resultados tão bons quanto o in vivo exposure, além de provocarem menores graus de stresse. Estes resultados podem contribuir para a redução do elevado número de pessoas que nunca chega a procurar tratamento. Um trabalho anterior do nosso grupo de investigação, o Veracity, utilizou realidade virtual no contexto da aracnofobia, um exemplo de fobia específica, de forma a proporcionar a exposição à fonte de fobia sem qualquer tipo de interação sensorial física. Com o Veracity, a interação foi realizada ao utilizar um dispositivo de reconhecimento gestual que permitia uma interação com o ambiente e aranhas, sem qualquer tipo de toque real. Nesta dissertação, quisemos acrescentar ao sistema uma resposta virtual háptica como feedback ao toque em aranhas. Apesar de o uso de respostas hápticas já ter sido usado ou estar a ser implementado com sucesso, noutras áreas, para nosso conhecimento, trata-se de uma inovação no que refere a trabalhos realizados na área do tratamento de fobias. O feedback háptico tem impacto no nível do realismo/interação das aranhas virtuais, ao adicionar o toque ao estimulo visual. Através do feedback háptico enquanto se aumentava o realismo tivemos como objetivo manter a experiência virtual segura do ponto de vista do utilizador fóbico, quando comparado com o in vivo exposure. Neste trabalho integrámos o feedback háptico dentro do loop do trabalho Veracity e avaliámos o impacto na resposta dos utilizadores, ao adicionar estas novas funcionalidades. Tal como no sistema original, continuámos a recolher as repostas fisiológicas, ECG, Frequência Cardíaca, Vídeo e Tracking 3D dos objetos virtuais, de forma a comparar as respostas dos utilizadores com, e sem respostas hápticas. Uma avaliação preliminar do sistema sugere que este método é de interesse para futuros trabalhos, apesar de necessitar de uma avaliação mais detalhada, por forma a garantir a sua utilidade e impacto do feedback háptico, entre os utilizadores fóbicos.
Chatel, Juliette. "On the assessment of pollutant emissions: the role of flue gas flow rate measurement : Critical review and industrial feedback." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200393.
Повний текст джерелаVallejo, Mauricio. "Noradrenergic tuning, not simple rate effects, produces temperature-sensitivity of the respiratory network in bullfrogs." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1527181646566301.
Повний текст джерелаSuliman, Ahmad. "A test case for implementing feedback control in a micro hydro power plant." Kansas State University, 2010. http://hdl.handle.net/2097/6847.
Повний текст джерелаDepartment of Electrical and Computer Engineering
Dwight D. Day
Micro-hydro turbines generate power for small villages and industries in Afghanistan. They usually produce less than 100 kW of power. Currently the flow into the turbine is controlled manually and the voltage is controlled automatically with an electronic load controller. Excess power not used by the village is dumped into a community water heater. For larger sites that have a reservoir and/or large variable load throughout the day and night, the turbine needs to be fitted with an automatic flow control system to conserve water in the reservoir or deal with the variable loads. Large turbines usually use hydraulic governors that automatically adjust the flow of water into the turbine. For micro-hydro sized plants this method would be too expensive and be difficult to build and maintain locally. For this reason, a 3 phase AC induction motor will be used to move the internal flow control valve of the turbine. Because a sudden change in load is possible (30 – 40%) for micro-hydro plants, the electronic load controller will also be needed to respond to quick changes in load so that the village voltage does not exceed 220V. This report documents the process of building a test system comprising of a dynamic resistive load, microcontroller controlled resistive load, a three phase AC generator and a DC Motor. Where the dynamic resistive load represents the load of the village, the computer controlled resistive load would represent the community water heater, the three phase AC generator represents the Generator on site and the DC Motor together with its DC input voltage would emulate the turbine and its water flow respectively. The DC input voltage would be also controlled with a PWM signal through a delay loop to represent the water gate delay effects on the turbine as close as possible. With this, it would be possible to completely build and test a control system that emulates the dynamics of a water turbine generator.
Cerovic, Stefan. "Cooperative wireless communications in the presence of limited feedback." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC079/document.
Повний текст джерелаIn this thesis, cooperation techniques have been studied for Multiple Access Multiple Relay Channel, consisted of at least two sources which communicate with a single destination with the help of at least two half-duplex relaying nodes. Time Division Multiplexing is assumed. First, the link adaptation algorithm is performed at the centralised scheduler. Sources transmit in turns in consecutive time slots during the first transmission phase. In each time slot of the second phase, the destination schedules a node to transmit redundancies, implementing a cooperative Hybrid Automatic Repeat reQuest (HARQ) protocol, where bidirectional limited control channels are available from sources and relays towards the destination. In the first part of the thesis, centralized node selection strategies are proposed for the second phase. The scheduling decisions are made based on the knowledge of the correctly decoded source sets of each node, with the goal to maximize the average spectral efficiency. An information outage analysis is conducted and Monte-Carlo (MC) simulations are performed to evaluate their performance. In the second part, a slow-link adaptation algorithm is proposed which aims at maximizing the average spectral efficiency under individual QoS targets for a given modulation and coding scheme family relying on the reported Channel Distribution Information of all channels. Discrete source rates are first determined using the "Genie-Aided" assumption, which is followed by an iterative rate correction algorithm. The resulting link adaptation algorithm yields performance close to the exhaustive search approach as demonstrated by MC simulations. In the third part, performances of Incremental Redundancy (IR) HARQ with Single and Multi User encoding, as well as the Chase Combining HARQ with Single User encoding are compared. MC simulations demonstrate that IR-HARQ with Single User encoding offers the best trade-off between performance and complexity for a small number of sources in our setting. Practical coding scheme is proposed and validated using MC simulations
Al, Roumy Jalal. "Analysis of the different signal acquisition schemes of an optical feedback based laser diode interferometer." Thesis, Toulouse, INPT, 2016. http://www.theses.fr/2016INPT0070/document.
Повний текст джерелаThe optical feedback interferometry phenomenon occurs when a portion of the output optical power is back-scattered from a remote target and coupled into the laser cavity to vary the laser’s emission properties (frequency and power mostly). Thus, this scheme results in a compact, self-aligned and contact-less interferometric sensor. Recent applications of optical feedback interferometer in the domains of microfluidics or acoustics have shown promising results and open new fields of researches. However in these applications, the amplitude of the sensing signal is extremely small due to the weakness of the backscattered power changes that are measured. In this thesis, an analytical model that describes the laser injection current and temperature dependence of the optical feedback interferometry signal strength for a single-mode laser diode has been derived from the Lang and Kobayashi rate equations. The model has been developed for all the known signal acquisition methods of the optical feedback interferometry scheme: from the package included monitoring photodiode, by collection of the laser power with an external photodetector and by amplification of the variations in the laser junction voltage. The model shows that both the photodiodes and the voltage signals strengths are related to the laser slope efficiency, which itself is a function of the laser injection current and of the temperature. Moreover, the model predicts different behaviors of the photodiodes and the voltage signal strengths with the change of the laser injection current and the temperature; an important result that has been proven by conducting measurements on all three signals for a wide range of injection current and temperature. Therefore, this simple model provides important insights into the radically different biasing strategies required to achieve optimal sensor sensitivity for the different interferometric signal acquisition schemes. In addition, the phase and amplitude relationships between the external and the in-package photodiode signals have been investigated theoretically and experimentally demonstrating unexpected results. Based on our model and on experimental observations, a critical study has been performed on the impact of the combination of the three signals in the signal processing strategy in order to improve the sensor sensibility to low amplitude optical feedback
Guvensen, Gokhan Muzaffer. "Near Capacity Operating Practical Transceivers For Wireless Fading Channels." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610398/index.pdf.
Повний текст джерелаon the other hand, it reduces the complexity of demodulation at the receiver by converting the channel into noninterfering subchannels. However, it is shown in this thesis that it is still possible to achieve a performance very close to the outage probability and exploit the space-frequency diversity benefits of the wireless fading channel without compromising the receiver complexity, even if the CSIT is not used. The proposed receiver structure is based on iterative forward and backward filtering to suppress the interference both in time and space followed by a spacetime decoder. The rotation of multidimensional constellations for block fading channels and the single-carrier frequency domain equalization (SC-FDE) technique for wideband MIMO channels are studied as example applications.
Cao, Pan. "Resource Allocation for Multiple-Input and Multiple-Output Interference Networks." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-161382.
Повний текст джерелаErdemli, Cigdem. "Does Enriched Mode Of Communication Make A Difference In Performance Feedback For The Rater And The Ratee? Comparing Written Feedback With Written Plus Verbal Feedback." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607719/index.pdf.
Повний текст джерелаWu, Fei. "Ultra-Low Delay in Complex Computing and Networked Systems: Fundamental Limits and Efficient Algorithms." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu155559337777619.
Повний текст джерелаJin, Lina. "Scheduling, spectrum sensing and cooperation in MU-MIMO broadcast and cognitive radio systems." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/scheduling-spectrum-sensing-and-cooperation-in-mumimo-broadcast-and-cognitive-radio-systems(300c7498-c0fb-478a-9f8d-39d005838fb6).html.
Повний текст джерелаRobertsson, Göran. "International portfolio choice and trading behavior." Doctoral thesis, Handelshögskolan i Stockholm, Finansiell Ekonomi (FI), 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:hhs:diva-624.
Повний текст джерелаDiss. Stockholm : Handelshögsk.
Thunberg, Andreas. "Energieffektivisering av luftningssteget på Käppalaverket, Lidingö." Thesis, Uppsala University, Department of Earth Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88824.
Повний текст джерелаThis master thesis in energy optimization was made during the autumn of 2006 at Käppala wastewater treatment plant in Lidingö, Stockholm. A preceding thesis, where all electricity consumption was mapped, showed that the aeration in the biological treatment is the single largest consumer in the plant, and it is therefore of interest to reduce this cost. The oxygen control strategy used at Käppala WWTP is working well from a nutrient removal point of view, but not from an economic one. The last aerobic zones have a very low oxygen consumption during low loading periods which give rise to enhanced dissolved oxygen concentrations with excessive costs and reduced denitrification as a result. But also during periods of normal loading unnecessary high oxygen concentration are sometimes given.
By modifying the aeration control strategy three full-scale experiments have been made, with the intention to reduce the air consumption. The experiments were carried out during week 37-50 in the autumn of 2006 and showed that savings could be made.
The regular oxygen control at Käppala WWTP controls the oxygen level in the aerobic compartment with two DO-setpoints; one in the first aerobic zone and one in the last. The zones in between are controlled by an airflow fractionation depending on the oxygen level in the first and last zone. In the first strategy to be evaluated, all four zones in the aerated part were individually controlled with its own setpoint. Two different setpoint combinations were tested. By using the fact that the efficiency in the oxygen transfer rate was higher at low airflows, savings of approximately 16 % were achieved. In the second strategy tested, an ammonia-feedback control combined with a DO-feedback controlled the DO-set point in the first aerobic zone. This strategy adjusted the DO- set points to the loading variations, and this gave a decreased airflow of approximately 9 %. Finally the two strategies were combined. All zones were then controlled individually with DO-set points set by an ammonium-feedback and a DO-feedback. The strategy gave savings in the airflow of approximately 18 %. In all three trials the aerated zones were more efficiently used, and the estimated savings are 550 000 SEK/year, and with a preserved nutrient removal efficiency.
Under hösten 2006 har ett examensarbete om energieffektivisering på Käppalaverket på Lidingö utförts. Ett föregående examensarbete där all elenergiförbrukning kartlades visade att blåsmaskinerna i biosteget står för den enskilt största förbrukningen i verket och det är därför av intresse att minska denna kostnad. Syrestyrningsstrategin som används på Käppalaverket fungerar mycket bra ur reningssynpunkt, men är inte optimal ur energisynpunkt. Dels luftas de första aeroba zonerna för mycket vid låg belastning vilket ger upphov till kraftigt förhöjda syrekoncentrationer i de sista aeroba zonerna med höga luftningskostnader och risk för försämrad denitrifikation, men även under normal belastning har det visat sig att onödigt höga syrekoncentrationer ibland ges.
Tre fullskaliga optimeringsförsök har utförts, med syfte att minska luftförbrukningen med bibehållen reningsgrad. Försöken pågick från vecka 37 till 50 hösten 2006, och visade att det finns möjlighet att spara energi genom att modifiera syrestyrningsstrategin.
Den reguljära syreregleringen i Käppalaverket styr syrehalten i den aeroba bassängen mot två syrebörvärden; ett i den första luftade zonen och ett i den sista. Luftflödet till de mellanliggande zonerna styrs av luftflödesandelar beroende på syrehalten i dessa två zoner. Den första strategin som utvärderades styrde istället samtliga zoner individuellt med egna börvärden, där två olika strukturer på de satta börvärdena användes. Genom att utnyttja en högre effektivitet i syreöverföringshastigheten vid låga luftflöden uppnåddes luftflödesbesparingar på ca 16 % i första försöket.
I den andra strategin styrdes syrebörvärdet i den första luftade zonen med hjälp av två återkopplingar, en från utgående ammoniumhalt och en från syrehalten i den sista luftade zonen.
Tack vare att strategin anpassade syrebörvärdena efter belastningen av syretärande ämnen erhölls luftflödesbesparingar på ca 9 %. Slutligen kombinerades de två strategierna; samtliga zoner styrdes individuellt med börvärden satta av en ammonium-återkoppling och en syre-återkoppling. Strategin medförde luftflödesbesparingar på ca 18 %. I samtliga försök utnyttjades de luftade zonerna bättre, och besparingspotentialen uträknad från 2005 års elpriser blev som mest 550 000 SEK/år, detta med en bibehållen reningsgrad.
Dornhege, Guido. "Increasing information transfer rates for brain-computer interfacing." Phd thesis, [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=98051276X.
Повний текст джерелаMoreira, Manoel Rodrigo [UNESP]. "Controle robusto com realimentação derivativa de sistemas não lineares via LMI." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/87046.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Em alguns problemas práticos, por exemplo, no controle de vibrações de sistemas mecânicos utilizando acelerômetros como sensores, é mais fácil obter a da derivada do vetor de estado do que o vetor de estado. Esta dissertação mostra que plantas lineares e invariantes no tempo descritas pelas matrizes {A,B,C,D}, cuja saída é a derivada do vetor de estado, são não observáveis e não estabilizáveis com realimentação da saída, quando det(A)=0. A impossibilidade de rejeição de distúrbios constantes, somados à entrada da planta quando det(A) 6= 0, realimentando-se a saída com controladores estáticos, foi também demonstrada. Adicionalmente, são propostas novas técnicas de controle para uma classe de sistemas não lineares com incertezas variantes no tempo. Condições na forma de desigualdades matriciais lineares, em inglês Linear Matrix Inequalities (LMIs), para o projeto de sistemas de controle empregando realimentação derivativa estática da derivada do vetor de estado, que ao mesmo tempo estabiliza a planta e maximiza o limite de incerteza do termo não linear, são estabelecidas com base em funções quadráticas de Lyapunov. Posteriormente estendem-se as condições de estabilidade robusta para sistemas não lineares com incertezas variantes no tempo e incertezas politópicas, que podem também representar falhas estruturais. O projeto do controlador é realizado através de condições baseadas em LMIs que, quando factíveis, podem ser resolvidas facilmente utilizando técnicas de programação convexa. Essa metodologia permite a inclusão de restrições de desempenho no projeto, como por exemplo, na taxa de decaimento e na norma de ganho dos controladores, de modo a atender às restrições do projeto. São apresentadas análises e resultados considerando o sinal de controle nulo e empregando realimentação derivativa estática do vetor de estado...
In some practical problems, for instance in the control of mechanical systems using accelerometers as sensors, it is easier to obtain the state-derivative vectors than the state vectors. This dissertation shows that (i) linear time-invariant plants given by the state-space model matrices {A,B,C,D} with output equal to the state-derivative vector are not observable and can not be stabilizable by using an output feedback if det(A) = 0 and (ii) the rejection of a constant disturbance added to the input of the aforementioned plants, considering det(A) 6= 0, and a static output feedback controller is not possible. The proposed results can be useful in the analysis and design of control systems with state-derivative feedback. Additionally, a new procedure for the control of a class of nonlinear systems with time-varying uncertainties using static statederivative feedback is proposed. Conditions based on Linear Matrix Inequalities (LMIs) for the design of robust controllers using state-derivative feedback, which simultaneously stabilizes the system and maximizes the uncertainty bound of the nonlinear term are proposed. Robust stability conditions for nonlinear systems with uncertainties and time-varying polytopic uncertainties, known as structural failures, are also presented. The controller design are based on LMIs which, when feasible, can be easily solved using convex programming techniques. This methodology allows the inclusion of performance constraints on the design, such as the decay rate and gain bounds in order to meet the design requirements. The dissertation considered cases where the control signal is equal to zero and with a state-derivative feedback. The elaboration of the theory for systems with n nonlinearities is illustrated through examples covering a single nonlinearity, with and without two polytopic uncertainties (and structural failures), and two nonlinearities... (Complete abstract click electronic access below)
Moreira, Manoel Rodrigo. "Controle robusto com realimentação derivativa de sistemas não lineares via LMI /." Ilha Solteira : [s.n.], 2011. http://hdl.handle.net/11449/87046.
Повний текст джерелаBanca: Edvaldo Assunção
Banca: Celso Pascoli Bottura
Resumo: Em alguns problemas práticos, por exemplo, no controle de vibrações de sistemas mecânicos utilizando acelerômetros como sensores, é mais fácil obter a da derivada do vetor de estado do que o vetor de estado. Esta dissertação mostra que plantas lineares e invariantes no tempo descritas pelas matrizes {A,B,C,D}, cuja saída é a derivada do vetor de estado, são não observáveis e não estabilizáveis com realimentação da saída, quando det(A)=0. A impossibilidade de rejeição de distúrbios constantes, somados à entrada da planta quando det(A) 6= 0, realimentando-se a saída com controladores estáticos, foi também demonstrada. Adicionalmente, são propostas novas técnicas de controle para uma classe de sistemas não lineares com incertezas variantes no tempo. Condições na forma de desigualdades matriciais lineares, em inglês Linear Matrix Inequalities (LMIs), para o projeto de sistemas de controle empregando realimentação derivativa estática da derivada do vetor de estado, que ao mesmo tempo estabiliza a planta e maximiza o limite de incerteza do termo não linear, são estabelecidas com base em funções quadráticas de Lyapunov. Posteriormente estendem-se as condições de estabilidade robusta para sistemas não lineares com incertezas variantes no tempo e incertezas politópicas, que podem também representar falhas estruturais. O projeto do controlador é realizado através de condições baseadas em LMIs que, quando factíveis, podem ser resolvidas facilmente utilizando técnicas de programação convexa. Essa metodologia permite a inclusão de restrições de desempenho no projeto, como por exemplo, na taxa de decaimento e na norma de ganho dos controladores, de modo a atender às restrições do projeto. São apresentadas análises e resultados considerando o sinal de controle nulo e empregando realimentação derivativa estática do vetor de estado... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: In some practical problems, for instance in the control of mechanical systems using accelerometers as sensors, it is easier to obtain the state-derivative vectors than the state vectors. This dissertation shows that (i) linear time-invariant plants given by the state-space model matrices {A,B,C,D} with output equal to the state-derivative vector are not observable and can not be stabilizable by using an output feedback if det(A) = 0 and (ii) the rejection of a constant disturbance added to the input of the aforementioned plants, considering det(A) 6= 0, and a static output feedback controller is not possible. The proposed results can be useful in the analysis and design of control systems with state-derivative feedback. Additionally, a new procedure for the control of a class of nonlinear systems with time-varying uncertainties using static statederivative feedback is proposed. Conditions based on Linear Matrix Inequalities (LMIs) for the design of robust controllers using state-derivative feedback, which simultaneously stabilizes the system and maximizes the uncertainty bound of the nonlinear term are proposed. Robust stability conditions for nonlinear systems with uncertainties and time-varying polytopic uncertainties, known as structural failures, are also presented. The controller design are based on LMIs which, when feasible, can be easily solved using convex programming techniques. This methodology allows the inclusion of performance constraints on the design, such as the decay rate and gain bounds in order to meet the design requirements. The dissertation considered cases where the control signal is equal to zero and with a state-derivative feedback. The elaboration of the theory for systems with n nonlinearities is illustrated through examples covering a single nonlinearity, with and without two polytopic uncertainties (and structural failures), and two nonlinearities... (Complete abstract click electronic access below)
Mestre
Broďák, Kamil. "Napájecí zdroj elektrostatického odlučovače." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221177.
Повний текст джерелаGalindo, Guarch Francisco Javier. "Digital hardware architectures for beam synchronous processing and of synchronization of particle accelerators." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672314.
Повний текст джерелаEn un Acelerador de Partículas, el Low Level RF (LLRF) es el sistema de control de la RF, e implícitamente, de la transferencia de energía y aceleración de partículas, objetivo último de la máquina. El LLRF implementa algoritmos que sincronizan la transferencia de energía de RF hacia el haz, y controla sus parámetros longitudinales. Usa señales del haz, cuyo contenido espectral se modifica con la aceleración. El incremento en energía implica un incremento en velocidad del haz que, para aceleradores circulares (Sincrotrones), resulta en un decremento del periodo de revolución. Esto es relevante en aceleradores de Hadrones, en los cuales la baja energía de inyección favorece grandes incrementos de velocidad antes de alcanzar valores relativistas. El LLRF necesita por tanto sintonizar continuamente el procesado y el haz (Beam Synchronous Processing). Una misión del LLRF es la compensación de la tensión inducida por el haz en cavidades aceleradoras (Beam Loading). En el sincrotrón SPS del CERN, el ancho de banda de regulación cubre 5 MHz a cada lado de la RF (200 MHz). Con un periodo de revolución de aproximadamente 23 µs, más de cien harmónicos de la frecuencia de revolución, presentes en la señal del haz, aparecen en las bandas alrededor de la RF. La variación en velocidad del haz cambia la posición y espaciado de estos harmónicos en el espectro. Su número y posición cambiante hacen una opción poco deseable la reconfiguración en algoritmos de control. La solución histórica es un reloj de sistema derivado de la RF, por tanto variable, que liga por diseño el muestreo y procesado al haz. Aún en uso en varias máquinas, este reloj es ahora un factor limitante para el uso de nuevas tecnologías. Esta Tesis presenta una nueva Arquitectura para Tratamiento Síncrono de Señales derivadas del Haz, mediante un reloj de sistema con frecuencia fija, que posibilita el tratamiento de señales periódicas en las que el harmónico fundamental tiene una frecuencia variable y conocida. La Arquitectura es una alternativa válida al problema de reconfiguración de algoritmos de procesado; sintoniza el espectro al procesado mediante el re-muestreo de los datos. Dos Re-muestreadores (Resamplers) son combinados en el denominada sándwich de re-muestreo. El algoritmo requiriendo sincronismo con el haz, se sitúa en medio de este sándwich. El elemento clave es un novedoso Resampler digital que acepta relaciones de re-muestreo arbitrarias y modificables en tiempo real. El hardware usa un único reloj de sistema de frecuencia fija, facilitando la implementación en FPGAs, ASICs y sistemas de última generación, como los controladores uTCA en los sistemas LLRF del SPS en el CERN. Los puertos de entrada y salida del Resampler, y todo el procesado en la Arquitectura, son síncronos a este reloj, y aceptan señales con una frecuencia de muestreo variable en tiempo real.La Arquitectura ha sido implementada en un controlador uTCA de una cavidad del SPS albergando el algoritmo One Turn FeedBack. El algoritmo compensa el Beam Loading. La Arquitectura demuestra ser viable operando sintonizada a una rampa de aceleración del haz, con una RF cuya frecuencia varia linealmente a 2.4 MHz por segundo siguiendo un patrón en diente de sierra. La implementación de la Arquitectura ha pasado toda la validación funcional y test cualitativos. La Arquitectura se adapta de manera sin igual a dos cambios de paradigma tecnológico adoptados por el LLRF del SPS; primero, la distribución del valor instantáneo de la frecuencia de RF es ahora hecho mediante una palabra digital con una red determinista, White Rabbit. Y segundo, la señal de referencia es ahora un reloj con frecuencia fija extraído de esta red. La adopción de ambos paradigmas se ve beneficiada por el uso de la Arquitectura y Resampler, que satisfacen los requerimientos técnicos y tecnológicos para la implementación de nuevos algoritmos y soluciones LLRF.
Dans le monde des Accélérateurs de Particules, le Low-Level RF (LLRF) est le système de contrôle de la RF et, in-fine, du transfert d'énergie et de l'accélération des particules. Il met en oeuvre des algorithmes synchronisant la RF transférant l'énergie au faisceau et adaptant ses paramètres longitudinaux. Pour cela, le LLRF utilise des signaux liés au faisceau dont le contenu spectral est modifié par l'accélération. L'augmentation d'énergie se traduit par une augmentation de la vitesse du faisceau, et pour les accélérateurs circulaires (Synchrotrons), une diminution de la période de révolution. Cela est particulièrement pertinent pour les machines à Hadrons dont l’énergie d’injection est faible, avec la conséquence d’une augmentation significative de leur vitesse durant l’accélération. Le LLRF doit donc ajuster en permanence son traitement au faisceau ; nous appelons cette exigence Beam Synchronous Processing. Une tâche importante du LLRF est la compensation de la tension induite par le faisceau (Beam Loading). Dans le SPS au CERN, la régulation couvre 5 MHz de chaque côté de la RF (200 MHz). Avec une période de révolution autour de 23 μs, plus d'une centaine d’harmoniques de fréquence de révolution, présentes dans le spectre du faisceau, tombent dans la bande +- 5 MHz. La variation de vitesse du faisceau modifie la position et l'espacement des harmoniques dans le spectre. Le grand nombre de raies spectrales et leur position variable font de la reconfiguration de l'algorithme une option indésirable. Les solutions digitales existantes ont donc préféré changer l’horloge d’échantillonnage : Celle-ci est verrouillée sur la RF, ce qui synchronise par conception l'échantillonnage et le traitement du faisceau. Cette solution historique, toujours en usage dans plusieurs machines, est aujourd'hui un facteur limitant pour les technologies modernes. La Thèse présente une nouvelle Architecture de traitement synchrone de faisceau, utilisant une horloge fixe, et capable de traiter des signaux périodiques de fréquence fondamentale connue et possiblement variable. L'Architecture apporte une alternative au fardeau de la reconfiguration dans les algorithmes ; il ajuste le spectre au traitement en rééchantillonnant les données d'entrée. Deux Rééchantillonneurs ont été combinés dans le sandwich de rééchantillonnage. L'algorithme d'application nécessitant un synchronisme avec le signal d'entrée est placé au milieu. L'élément clé est un nouveau Ré-échantillonneur entièrement numérique basé sur une architecture Farrow, qui accepte des taux de rééchantillonnage arbitraires pouvant également être modifiés en temps réel. L’implémentation utilise une seule horloge système à fréquence fixe, ce qui rend sa mise en œuvre possible dans les FPGA, ASIC et systèmes de pointe comme la nouvelle plate-forme uTCA actuellement déployée dans le SPS du CERN. L’entrée et la sortie du Ré-échantillonneur, et tout le traitement dans l'Architecture, sont synchrones avec cette horloge et acceptent un taux d’échantillonnage variable que peut être modifiée en temps réel. L'Architecture a été déployée dans un châssis uTCA hébergeant l'algorithme One Turn FeedBack pour contrôler une véritable cavité SPS. L'algorithme compense le Beam Loading. L'Architecture a démontré sa capacité à suivre en temps réel une rampe d'énergie avec une fréquence RF suivant une modulation en dent de scie, à 2.4 MHz par seconde. L’implémentation complète sur uTCA a passé avec succès les tests de validation fonctionnelle et qualitative. L'Architecture convient parfaitement aux deux paradigmes technologiques adoptés pour le nouveau système LLRF du SPS ; premièrement, la valeur instantanée de la fréquence RF est transmise sous forme de mot numérique (qui donnera le taux de rééchantillonnage), via un réseau déterministe, le White Rabbit. Et deuxièmement, le signal de référence est maintenant l'horloge à fréquence fixe récupérée de ce réseau. La solution présentée respecte ces deux paradigmes grâce au Réchantillonneur entièrement numérique et à l'horloge fixe.
Ciència i enginyeria de materials
Hickey, Chelsea Aleena. "Digital Feedback: Trends in Constituents\' Communication with Elected Officials." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23097.
Повний текст джерелаMaster of Arts
Kielty, Lori S. "Feedback In Distance Learning: Do Student Perceptions Of Corrective Feedback Affect Retention In Distance Learning?" [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000255.
Повний текст джерелаCorderman, David Sandt. "Perceptual Agreement Between Multi-rater Feedback Sources in the Federal Bureau of Investigation." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11165.
Повний текст джерелаPh. D.
Kim, Thanh Tùng. "Quantized Feedback for Slow Fading Channels." Licentiate thesis, KTH, School of Electrical Engineering (EES), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3952.
Повний текст джерелаTwo topics in fading channels with a strict delay constraint and a resolution-constrained feedback link are treated in this thesis.
First, a multi-layer variable-rate single-antenna communication system with quantized feedback, where the expected rate is chosen as the performance measure, is studied under both short-term and long-term power constraints. Iterative algorithms exploiting results in the literature of parallel broadcast channels are developed to design the system parameters. A necessary and sufficient condition for single-layer coding to be optimal is derived. In contrast to the ergodic case, it is shown that a few bits of feedback information can improve the expected rate dramatically. The role of multi-layer coding, however, reduces quickly as the resolution of the feedback link increases.
The other part of the thesis deals with partial power control systems utilizing quantized feedback to minimize outage probability, with an emphasis on the diversity-multiplexing tradeoff. An index mapping with circular structure is shown to be optimal and the design is facilitated with a justified Gaussian approximation. The diversity gain as a function of the feedback resolution is analyzed. The results are then extended to characterize the entire diversity-multiplexing tradeoff curve of multiple-antenna channels with resolution-constrained feedback. Adaptive-rate communication is also studied, where the concept of minimum multiplexing gain is introduced. It is shown that the diversity gain of a system increases significantly even with coarsely quantized feedback, especially at low multiplexing gains.
Baldry, Caroline Jane. "The impact of multi-source multi-rater (MSMR) feedback on management development." Thesis, Goldsmiths College (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248198.
Повний текст джерелаFlores, Catalina. "Linking Diversity Climate and Feedback Seeking Through Interpersonal Processes and Race Effects." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron161778390895531.
Повний текст джерелаFalkendal, Theresa Maria. "Constraining star formation rates and AGN feedback in high-z radio galaxies." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS248.
Повний текст джерелаThe evolution of galaxies is something that is still not well understood. The cosmic star formation rate density peaks between 1 < z < 3. It is therefore important to investigate the high-z Universe and the mechanisms which triggers or quenches star-formation in galaxies. In this thesis I investigate the effects of AGN feedback by studying high-z radio galaxies (HzRGs). For a sample of 25 HzRGs at 1 < z < 5.2, I add new ALMA data and determine the star formation rates (SFR) by multi-wavelength spectral energy distribution fitting. The ALMA data reveals that the mm continuum emission can be complicated, with contributions from several thermal dust emission components and/or synchrotron emission. The new estimated SFRs are 7 times lower than in previous studies. We might therefore be observing the effect of the AGN suppressing the growth of the host galaxy. For one source I explore the possibilities of constraining the gas Physics of the host galaxy and the halo gas by combining MUSE and ALMA data cubes. Quiescent ionized halo gas is detected, which coincide with a molecular gas reservoir detected with ALMA in [C I]. These observations probe the complex multi-phase halo gas and show the power of multi-wavelength observations
Ackerman, Michelle Lynn. "The impact of feedback on self-rated driving ability among older adults." Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2009r/ackermand.pdf.
Повний текст джерелаTitle from PDF title page (viewed Sept. 21, 2009). Additional advisors: Michael Crowe, Cynthia Crowley, Virginia G. Wadley, David E. Vance. Includes bibliographical references (p. 31-34).
Oliveira, Jaderson Pereira. "Análise e Desenvolvimento de um Filtro alfa-beta para Medição Indireta de Sistemas Dinâmicos de Primeira Ordem." Universidade Federal do Maranhão, 2006. http://tedebc.ufma.br:8080/jspui/handle/tede/364.
Повний текст джерелаWe present in this work the development of an α-β filter for indirect measurement in 1st order dynamic systems, derived from the known equations for the α-β filter applied to systems with a pure integer. The main α-β filter design parameters analyzed are: the variance reduction factor of the measurement noise and the total transient error for a step input. Further, we present the development of the equations for the calculation of a critically dumped filter. As example of application, we use the concepts developed for the design of an α-β filter for the indirect measurement of the oxygen up-take rate in activated sludge systems in a dissolved oxygen feedback configuration, which can be viewed as a 1st order system. Simulations and comparisons with other methods are carried out in order to illustrate the proposed formulations.
Neste trabalho, apresenta-se o desenvolvimento do filtro α-β para medição indireta em sistemas dinâmicos de 1ª ordem a partir das equações conhecidas do filtro α-β aplicados a sistemas com um integrador puro. Os principais parâmetros de projeto do filtro analisado são: o fator de redução de variância do ruído de medição e o erro total de transitório para uma entrada do tipo degrau. Além disso, apresenta-se o desenvolvimento das equações para o cálculo de um filtro criticamente amortecido. Como exemplo de aplicação, utiliza-se os conceitos desenvolvidos para o projeto de um filtro α-β para medição indireta da taxa de consumo de oxigênio em sistemas de tratamento de esgotos de lodo ativado em uma configuração de realimentação da concentração de oxigênio dissolvido, o qual pode ser considerado um sistema de 1ª ordem. Simulações e comparações com outros métodos são apresentadas de forma a ilustrar a formulação proposta.
Weinberg, Lisa Munson. "Parents' educational expectations for their young children SES, race/ethnicity and school feedback /." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-11092009-182202/.
Повний текст джерелаAdvisor: John Reynolds, Florida State University, College of Social Sciences and Public Policy, Dept. of Sociology. Title and description from dissertation home page (viewed on Mar. 29, 2010). Document formatted into pages; contains xi, 78 pages. Includes bibliographical references.
Bell, Heather C., and University of Lethbridge Faculty of Arts and Science. "Playful feedback and the developing brain." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2008, 2008. http://hdl.handle.net/10133/747.
Повний текст джерелаx, 93 leaves : ill. ; 29 cm.
Lin, Chang-Ho. "The capacity of multi-access TD/CCSK with decision feedback and transmitted reference." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178217163.
Повний текст джерела