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Ackermann, Marius Francois. "Satire, spraakvryheid, sensuur en siviele aanspreeklikheid en portretjie en ander verhale (Afrikaans)." Diss., University of Pretoria, 2010. http://hdl.handle.net/2263/26105.
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Kleyn, Leti. "’n Sisteemteoretiese kartering van die Afrikaanse literatuur vir die tydperk 2000–2009 : kanonisering in die Afrikaanse literatuur." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/32714.
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In hierdie studie word ondersoek ingestel na die rolspelers in die Afrikaanse literêre sisteem wat
tot kanonisering aanleiding gee. Die literêre sisteem word gekarteer deur die publikasies,
resepsie daarvan en openbare debatte daaroor vir die tydperk 2000–2009 te ondersoek. Daar
word aandag gegee aan die uitgewersbedryf; mediapraktyke; literêre pryse; vertalings;
bloemlesings; literatuurgeskiedenisse; skryfskole; verwerking van literêre werke vir film en die
uitvoerende kunste; die impak wat die sensuurwetgewing op die status van skrywers en die
bedryf gehad het; leeskringe en ’n aantal kleiner rolspelers soos boeksubsidies, biblioteke,
literêre tydskrifte, skrywersverenigings en literêre toerisme. Daar word verder ook aandag gegee
aan die wyse waarop hiërargieë in die sisteem tot stand kom, kanonisering bewerkstellig word,
knelpunte in die magspel tot uiting kom in veral openbare debatte, en die wyse waarop eksterne
faktore op die sisteem inspeel. Die studie wys op die fyn netwerk wat onstaan as verbande
tussen verskillende rolspelers in die literêre sisteem van nader ondersoek word.Thesis (PhD)--University of Pretoria, 2013.
gm2013
Information Science
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Nag, Chowdhury Suvam. "Conductive Polymer nanoComposite Quantum Resistive strain Sensors for structural composites damage monitoring." Thesis, Lorient, 2014. http://www.theses.fr/2014LORIS343.
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Un nouveau type de Senseur de déformation Résistif Quantique (QRS) à base de nanotubes de carbone (CNT) a été développé pour le suivi de santé de structures composites (SHM). Les senseurs ont été fabriqués directement par pulvérisation en couche par couche (sLBL) sur la surface de fibres de verre ou de carbone d'une formulation de nanoComposites Polymères Conducteurs (CPC). La réponse des transducteurs CPC a été étudiée sous diverses sollicitations mécaniques en mode statique et dynamique. Différentes stratégies de suivi de santé des composites à l'aide de senseurs piézo-résistifs ont été comparées en termes d'efficacité de suivi des sollicitations mécaniques dans les domaines élastique et plastique et des endommagements. Les résultats montrent que les réponses des senseurs conservent toutes les caractéristiques statiques et dynamiques d'entrée fournissant ainsi des informations utiles pour le SHM. Cela permet d'envisager leur déploiement dans des pièces composites de grandes dimensions, pour évaluer les déformations et les concentrations de contraintes locales et ainsi faciliter la simulation et la modélisation dans ces zones critiques. La réponse électrique des QRS a aussi été utilisée pour évaluer l'accumulation d'endommagement dans les composites en association avec la microscopie et l'émission acoustique (AE) afin de détecter l'initiation de fissures et leur propagation dans des composites stratifiés. Sur la base des résultats obtenus dans cette étude, les QRS étudiés peuvent être considérées comme des capteurs en temps réel peu intrusifs qui semblent être tout à fait appropriés pour effectuer des mesures dvnamioues dans des aoolications d'inoénierie structurelleA new type of carbon nanotubes based Quantum Resistive Strain sensor (QRS sensor) for structural health monitoring (SHM) has been developed directly on glass fibers' surface via spray layer by layer (slbl) technique. The response of similar transducers was investigated under varying static and dynamic sollicitations. Different strategies of piezo-resistive sensing in GFRP are compared in terms of efficiency to follow mechanical solicitations and damages in both elastic and plastic demains. The results demonstrate that the sensors' output retains ail static and dynamic features of the input thus providing useful information for SHM and further can be extended for composite parts with large dimensions, to probe local stress/strain concentrations and facilitate the simulation of these critical areas. The electrical responses of QRS combined with those of the acoustic emission (AE) technique and microscopy have allowed investigating damage initiation and propagation in laminated composites. Based on the results obtained in this study, the investigated QRS can be considered as real time in situ non strongly invasive sensors which appear to be suitable for performing dynamic measurements in structural engineering applications
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Gonzalez-Rubio, Garrido Paula. "Nouvelles perspectives pour comprendre la reconnaissance des défauts d'empaquetage lipidique par le senseur de courbure membranaire ALPS (Amphipathic Lipid Packing Sensor)." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2009. http://tel.archives-ouvertes.fr/tel-00813418.
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Des motifs structuraux largement impliqués dans les processus de modulation de la courbure membranaire sont les hélices amphipathiques. Parmi eux, un senseur de la courbure exhibant des propriétés particulières a été identifiée récemment : ALPS (ArfGAP1 Amphipathic lipid packing sensor). Il a été montré que son interaction avec la membrane était indépendante des charges Žlectrostatiques En effet, le modèle actuel suggère que les résidus hydrophobes soient les responsables de l'ancrage d'ALPS ˆ la membrane en reconaissant les défauts d'empaquetage lipidique. Par simulations par dynamique moléculaire des différentes membranes lipidiques avec le motif ALPS, nous montrons que ce senseur exhibe une considérable liberté conformationnelle et structurelle qui l'habilitent ˆ explorer les défauts d'empaquetage aux niveaux des têtes polaires ainsi qu'au niveau des chaînes aliphatiques. Nous proposons des nouvelles perspectives au niveau atomique de la reconnaissance des défauts d'empaquetage lipidique par ALPS o la déformabilité et flexibilité structurale ainsi que les propriétés dynamiques et physiques de la membrane jouent un r™le prépondérant.
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Bhuiya, Md Omar F. "DESIGN AND OPTIMIZATION OF A STRIPLINE RESONATOR SENSOR FOR MEASUREMENT OF RUBBER THICKNESS IN A MOVING WEB." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1164650416.
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Jackson, Philip Gordon. "Sensual culture : the socio-sensual practices of clubbing." Thesis, University College London (University of London), 2001. http://discovery.ucl.ac.uk/1317572/.
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This study is examines of the world of clubbing when viewed as a holistic field of socio-sensual practice. Over the course of this study I observed a consistent form of bodily practice, occurring in clubs, that had initially appeared very different from one another. This practice made these clubs more similar to one another than different and this socio-sensual similarity became the focus of this study. In order to examine this aspect of clubbing I have utilised a number of theoretical frameworks, that arose from a series of disparate fields, but which are still connected. From anthropology and sociology I have drawn upon the work of Pierre Bourdieu, Marcel Mauss, Michael Foucault, Norbert Elias and Chris Shilling. From Philosophy I have utilised the work of Maurice Merleau-Ponty, George Lakoff and Mark Johnson. From neuro-cognitive studies I was strongly influenced by the work of Antonio Damasio and Joseph LeDoux. These alternate perspectives consolidate one another's assertions, as to the nature of this experiential encounter, and I have used them to provide a connective thread across the realm of clubbing. Nevertheless the vast bulk of theoretical material in this work is derived from observing and participating in club nights and interviewing clubbers, both at a formal and informal level. This has created a study which explores two aspects of the club scene. The first arises from the actual practice of clubbing: what people experience, how it affects them, what they make of it, and it is grounded in an ethnographic analysis of the space. The second is a theory of sensuality, which is also derived from observations of the club space and is grounded in an examination of the way in which people experience and give meaning to their worlds through the sensual practice of inhabiting that world.
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Santoro, Sandra L. "Sensual shrines /." Online version of thesis, 1992. http://hdl.handle.net/1850/11654.
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Fernandez, Alejandro Arteaga. "Sensuous framing." Doctoral thesis, Humboldt-Universität zu Berlin, Philosophische Fakultät I, 2011. http://dx.doi.org/10.18452/16370.
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In dieser Dissertation wird eine ästhetische Praxis – das „sensuous framing“ – charakterisiert. Im Zuge dessen bilden einerseits das enaktivistische Wahrnehmungskonzept und andererseits der Begriff der „Fadheit“, so er wie von François Jullien dargelegt wird, die kognitionswissenschaftliche und die ästhetisch-philosophische Grundlage für diese Charakterisierung. Die „SozialePlastik“, insbesondere die Arbeit von Shelley Sacks, wird dabei als Beispiel einer ästhetischen Praxis analysiert, die ebenso erkenntnistheoretisch begründet ist.This dissertation outlines an aesthetic practice of “sensuous framing“. The enactivist concept of perception and the concept of “blandness,” described by François Jullien, underpin its theoretical framework, and link it to the fields of cognitive science and philosophy of aesthetics. “Social sculpture,” specifically focusing on the work of Shelley Sacks, is analyzed as an example of this practice and presents an aesthetic approach to theories of epistemology.
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Frykberg, Wallin Fanny. "Sensum." Thesis, KTH, Arkitektur, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298500.
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Som moderna människor lever vi idag i ett samhälle med högt tempo, en digital livsstil och ständig uppkoppling som leder till en ohälsosam livsstil. En högpresterande kultur där den digitala världen har en stor plats i våra liv med ett konstant flöde av händelser och information, en parallell värld som aldrig vilar. I en storstad som Stockholm samsas många funktioner på samma yta och innefattar en miljö med många intryck och signaler för oss som människor att förhålla sig till och för vår hjärna att sortera. Behovet av att finna en lugn tillvaro och en paus i vardagen för rekreation och återhämtning är stor. I mitt examensarbete har jag jobbat med dessa frågor som problematik och utgångspunkt. Visionen har varit att skapa en plats i förebyggande syfte för denna problematik, och genom det skapa en plats för kontemplation. Detta har resulterat i en i form av modern stadspark och kontemplativt rum ett av Stockholms mest centrala och trafikerade stadsrum, Brunkebergstorg, där de arkitektoniska greppen och upplevelsen genom våra sinnen av den gestaltade miljön har används som ett distraherande gestaltningsgrepp.In todays society, we live live in a stressful environment with a high pace, with a digitalism that leads to an unhealthy lifestyle. A world where performance and high results is used as a high status symbol, we live with a parallel digital world with constant flow of information that never rests. In a capital city like Stockholm, many functions and gatherings of people are taking place in the same area wich results in a lot of information and signals for our minds to process. The need for recreation and break in the everyday -life is greater than ever before. In my thesis, I have worked with these issues and problems and starting point. The main goal has been to create a space to prevent these issues and furthermore create a place aimed for contemplation. As a result, my design takes form as a modern citypark in one of Stockholms most busy parts of the city, Brunkebergstorg. A contemplative space where the experience through our senses has been used as a distaction of our minds.
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Geiger, Remi. "Senseur inertiel à ondes de matière aéroporté." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00651016.
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cette thèse porte sur l'étude d'un accéléromètre à ondes de matière fonctionnant à bord d'un avion effectuant des vols paraboliques et permettant des expériences en micro-gravité (0-g). Un interféromètre à atomes de 87Rb refroidis par laser, et dont les états quantiques sont manipulés à l'aide de transitions Raman stimulées, constitue l'élément physique du capteur. Lors de la conception du dispositif expérimental, un effort particulier a été apporté au choix d'une source laser transportable, stable, et robuste. Nous démontrons pour la première fois le fonctionnement aéroporté d'un senseur inertiel à ondes de matière, à la fois en 0-g et durant les phases de gravité des vols (1-g). Nous proposons une technique combinant le signal de l'interféromètre à celui d'accéléromètres mécaniques auxiliaires pour effectuer des mesures au dela de la dynamique intrinsèque du capteur atomique. Nous expliquons comment bénéficier du haut niveau de sensibilité de l'interféromètre dans l'avion, et indiquons des voies d'améliorations significatives de notre dispositif pour le futur. En 0-g, nous montrons une amélioration de la sensibilité de l'accéléromètre jusque 2 x 10-4 m.s-2 à une seconde, et étudions une réjection des vibrations de l'avion à l'aide d'un interféromètre à quatre impulsions Raman. L'objectif de notre projet consiste en un test du principe d'universalité de la chute libre avec un double accéléromètre à atomes de 87Rb et de 39K. Notre système laser double-espèce emploie des composants optiques fibrés aux longueurs d'onde de 1.56 et 1.54 μm, ainsi qu'un doublage de fréquence pour obtenir la lumière utile à 780 et 767 nm pour le refroidissement et la manipulation des deux atomes. Nous étudions théoriquement la sensibilité d'une mesure de leur différence d'accélération en tenant compte des vibrations de l'avion, et précisons comment une résolution de l'ordre de 10-10 m.s-2 pourra être atteinte dans le futur avec notre expérience aéroportée.
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Normandeau, Charles-Olivier. "Développement d’un senseur ionique sélectif au phosphate." Master's thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26495.
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De nos jours, les normes environnementales sont de plus en plus restrictives. En agriculture, ces restrictions environnementales sont souvent reliées à la quantité d’engrais utilisée dans les sols. Pour s’assurer du respect des normes en vigueur plusieurs analyses de sols et de cours d’eau sont nécessaires. La majorité de ces analyses de sols sont réalisées en laboratoire, ce qui occasionne un délai et des coûts importants. C’est pourquoi les analyses in situ sont de plus en plus envisagées, leur coût théorique étant moindre. L’inconvénient est que les technologies d’analyses in situ visant à réduire le coût d’analyse en laboratoire présentement disponibles deviennent rapidement coûteuses lors d’une utilisation à grande échelle comme dans un champ ou dans une serre hydroponique. L’élaboration d’une nouvelle technologie d’analyse ionique pour le phosphate est présentée dans ce mémoire. Le but de cette technologie est d’analyser le phosphate in situ. Son intérêt est de le réaliser à moindre coût. Cette technologie est basée sur le développement d’un senseur à membrane sélective, présenté ici, dans lequel sera mesurée avec précision l’impédance électrique. Comparativement aux systèmes potentiométriques existants, cette technologie électrique permet l’élimination de composantes coûteuses telles que les électrodes de calomel. La preuve de concept associée au projet sera présentée en première partie. Elle sera suivie de la présentation de l’élaboration d’un prototype, puis de son évolution vers le modèle céramique présentement testé. Les résultats des tests de développement, de la stabilité de la membrane, de la dégradation du senseur, de la sensibilité et de la sélectivité seront exposés. Puis, les résultats du senseur seront soumis à une comparaison et à une analyse en lien avec les quantités de phosphate nécessaires pour l’eutrophisation des eaux. Les standards d’eutrophisation sont des barèmes que notre senseur doit pouvoir atteindre pour permettre l’analyse environnementale. Finalement, un autre modèle de senseur sera présenté, le senseur plan, de même que ses avantages industriels et les tests préliminaires lui étant associés.
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Damianakis, John. "Proximity sensor network for sensor-based manipulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29588.pdf.
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Grivault, Ludovic. "Architecture multi-agent pour la conception et l'ordonnancement de systèmes multi-senseur embarqués sur plateformes aéroportées." Electronic Thesis or Diss., Sorbonne université, 2018. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2018SORUS152.pdf.
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Le problème de planification et d'ordonnancement des capteurs d'une plateforme aéroportée peut être assimilé à un problème de perception active avec maximisation de la connaissance de l'environnement et optimisation des actions senseurs qui en découlent. La problématique de la prise de décision fait naître le besoin d'une architecture au sein de laquelle les algorithmes de décision, les produits des capteurs et les données permettant leur interprétation sont organisés le plus efficacement possible tout en étant conformes avec les contraintes apportées par le contexte. Les produits de la phase de planification doivent ensuite être exécutés avec un délai minimal par les capteurs et nécessitent ainsi un ordonnancement réactif et efficace adapté à la criticité des missions et à la complexité de l'environnement. La décision des actions capteurs à exécuter au regard de l'environnement de la plateforme et du commandement demande une capacité de planification propre à l'ensemble des capteurs, afin de prendre des décisions en fonction des perceptions et contraintes de fonctionnement de chaque capteur. Un système multi-capteur, tel que présenté dans ce manuscrit, peut s'apparenter formellement à un atelier du type job-shop dans lequel les machines correspondent aux capteurs du SMS. Ces dernières années les capteurs embarqués à bord des plateformes aéroportées n'ont cessé de se développer. Nous verrons dans ce manuscrit comment le paradigme multi-agent permet de concevoir une architecture répondant au contexte et à ses évolutions moyen terme puis comment un ordonnancement à base d'heuristiques permet d'optimiser globalement les capteurs présents à bord de la plateformeThe problem of planning and scheduling the sensors of an airborne platform can be likened to an active perception problem with maximization of the environment knowledge and optimization of resulting sensors actions. The problem of decision-making entails the need for an architecture within the decision algorithms, the products of the sensors and the data allowing their interpretation are organized as efficiently as possible while being in conformity with the constraints brought by the context. The products of the planning phase must then be executed with minimal delay by the sensors and thus require a reactive and efficient scheduling adapted to mission criticality and the complexity of the environment. The decision of the sensor actions to be performed with regard to the environment of the platform and the command requires a planning capability specific to all sensors, in order to make decisions according to the perceptions and operating constraints of each sensor. A multi-sensor system, as presented in this manuscript, can be formally related to a job-shop type of workshop in which the machines correspond to the SMS sensors. In recent years the sensors on board airborne platforms have continuously grown. We will see in this manuscript how the multi-agent paradigm enables to design an architecture that responds to the context and its medium-term evolution, then how heuristic-based scheduling optimizes the sensors on board
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Jones, Peter B. (Peter B. ). S. M. Massachusetts Institute of Technology. "Dynamic sensor tasking in heterogeneous, mobile sensor networks." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/35782.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.Includes bibliographical references (leaves 97-101).
Modern sensor environments often attempt to combine several sensors into a single sensor network. The nodes of this network are generally heterogeneous and may vary with respect to sensor complexity, sensor operational modes, power costs and other salient features. Optimization in this environment requires considering all possible sensor modalities and combinations. Additionally, in many cases there may be a time critical objective, requiring sensor plans to be developed and refined in real-time. This research will examine and expand on previous work in multi-sensor dynamic scheduling, focusing on the issue of near optimal sensor-scheduling for real-time detection in highly heterogeneous networks. First, the issue of minimum time inference is formulated as a constrained optimization problem. The principles of dynamic programming are applied to the problem. A network model is adopted in which a single "leader" node makes a sensor measurement. After the measurement is made, the leader node chooses a successor (or chooses to retain network leadership). This model leads to an index rule for leader/action selection under which the leader is the sensor node with maximum expected rate of information acquisition. In effect, the sensor and modality with the maximum ratio of expected entropic decrease to measurement time is shown to be an optimal choice for leader.
(cont.) The model is then generalized to include networks with simultaneously active sensors. In this case the corresponding optimization problem becomes prohibitively difficult to solve, and so a game theoretic approach is adopted in order to balance the preferences of the several sensors in the network. A novel algorithm for multiplayer coordination is developed that uses iterative partial utility revelation to achieve bounded Pareto inefficiency of the solution.
by Peter Jones.
S.M.
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Firouzi, Fereshteh. "Sensor Placement for Damage Localization in Sensor Networks." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6019.
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The objective of this thesis is to formulate and solve the sensor placement problem for damage localization in a sensor network. A Bayesian estimation problem is formulated with the time-of-flight (ToF) measurements. In this model, ToF of lamb waves, which are generated and received by piezoelectric sensors, is the total time for each wave to be transmitted, reflected by the target, and received by the sensor. The ToF of the scattered lamb wave has characteristic information about the target location. By using the measurement model and prior information, the target location is estimated in a centralized sensor network with a Monte Carlo approach. Then we derive the Bayesian Fisher information matrix (B-FIM) and based on that posterior Cramer-Rao lower bound (PCRLB), which sets a limit on the mean squared error (MSE) of any Bayesian estimator. In addition, we develop an optimal sensor placement approach to achieve more accurate damage localization, which is based on minimizing the PCRLB. Simulation results show that the optimal sensor placement solutions lead to much lower estimation errors than some sub-optimal sensor placement solutions.
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Hameed, Tariq, Ahsan Ashfaq, and Rabid Mehmood. "Intelligent Sensor." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-17310.
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The task is to build an intelligent sensor that can instruct a Lego robot to perform certain tasks. The sensor is mounted on the Lego robot and it contains a digital camera which takes continuous images of the front view of the robot. These images are received by an FPGA which simultaneously saves them in an external storage device (SDRAM). At one time only one image is saved and during the time it is being saved, FPGA processes the image to extract some meaningful information. In front of digital camera there are different objects. The sensor is made to classify various objects on the basis of their color. For the classification, the requirement is to implement color image segmentation based object tracking algorithm on a small Field Programmable Gate array (FPGA). For the color segmentation in the images, we are using RGB values of the pixels and with the comparison of their relative values we get the binary image which is processed to determine the shape of the object. A histogram is used to retrieve object‟s features and saves results inside the memory of FPGA which can be read by an external microcontroller with the help of serial port (RS-232).
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Saillant, Vincent. "Comprendre le mécanisme du système senseur d’hème des bactéries pathogènes, une cible antibiotique innovante A novel Enterococcus faecalis heme transport regulator (FhtR) is a heme sensor in the gastrointestinal tract." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASB023.
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L’hème, une structure porphyrique contenant un atome de fer, est un cofacteur essentiel à de nombreuses fonctions bactériennes. Cependant, le fer de l’hème génère des radicaux libres, ce qui explique sa toxicité. Un des mécanismes principaux de détoxification de l’hème est l’expression, par les bactéries à Gram positif, d’un transporteur d’efflux de la famille ABC, HrtBA. La régulation de ce transporteur a été étudiée chez deux bactéries pathogènes opportunistes Enterococcus faecalis et Staphylococcus aureus, responsables d’infection nosocomiales multirésistantes. Chez E. faecalis, un nouveau régulateur de la famille TetR, FhtR, a été identifié et caractérisé. L’inhibition de la transcription de hrtBA par FhtR est levée par sa liaison à l’hème. FhtR a aussi un impact important sur l’activité de la catalase à hème, KatA. FhtR a donc un rôle majeur dans l’homéostasie intracellulaire de l’hème. Dans un modèle de transit intestinal chez la souris, HrtBA est induit, suggérant que ce mécanisme est important pour E. faecalis, une bactérie commensale de l’intestin, dans cet environnement. Chez S. aureus, la transcription de hrtBA est régulée par un système à deux composants HssRS. L’étude du mécanisme du senseur membranaire HssS a révélé que la partie cytoplasmique de l’histidine kinase était impliquée dans la liaison et la transduction du signal hème pour l’expression de HrtBA. L’ensemble de ces résultats démontrent que, bien que HrtBA soit conservée, plusieurs systèmes distincts régulent son expression, suggérant une adaptation complexe de la réponse bactérienne à l’hème de l’hôte et son importance dans la relation hôte-pathogène. Bloquer HrtBA ou la transduction du signal hème par ces deux senseurs d’hème pourrait constituer une cible pour la recherche antibiotique chez ces deux pathogènesHeme, a porphyrin containing an iron atom, is an essential cofactor of several bacterial functions. Heme is also toxic because of the reactivity of the iron generating reactive oxygen species. One of the main mechanisms of heme detoxification, in Gram-positive bacteria, relies on the expression of a heme efflux ABC transporter, HrtBA. The regulation of this transporter has been investigated in two opportunistic pathogens, Enterococcus faecalis and Staphylococcus aureus, two bacteria responsible for multiresistant nosocomial infections. In E. faecalis, a new TetR family regulator, FhtR, has been identified and characterized. The FhtR dependent transcriptional inhibition of hrtBA is lifted by its binding to heme. FhtR controls the intracellular heme pools as showed par the activity of the endogenous heme dependent catalase, KatA. FhtR is thus a master regulator of heme intracellular homeostasis in E. faecalis. In a mouse model of intestinal transit, HrtBA is expressed, demonstrating the relevance of this system in the gastrointestinal tract where E. faecalis is a commensal resident. In S. aureus, hrtBA transcription is controled by the two-component system, HssRS. The study of the mechanism of the membrane heme sensor HssS showed that the intracytoplasmic of the histidine kinase was responsible of the binding and heme signal transduction for HrtBA expression. Alltogether, these results demonstrate that while HrtBA is conserved among Gram positive bacteria, the regulating mechanisms leading to its expression are varied. This suggests that the host heme response is dependent of the bacteria lifestyle and underlies the importance of this cofactor in the host-pathogen relationship. Inhibiting heme effux by HrtBA or the heme sensing mechanisms could lead to new antibiotic strategies
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Liess, Martin. "Design neuer Sensoren unter Berücksichtigung von Strukturaspekten." Aachen : Shaker, 2005. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB12103500.
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Iqbal, Javed, and Farhan Moughal. "Wireless Sensor Network Setup : Wireless sensor motes embedded programing." Thesis, Halmstad University, Halmstad Embedded and Intelligent Systems Research (EIS), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-5005.
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Exploitation of wireless sensor networks (WSNs) in ubiquitous computing environments is continuously increasing for gathering data. Contemporary distributed software systems on WSNs for pragmatic business applications have become extremely adaptive, dynamic, heterogeneous and large scaled. Management of such system is not trivial to fulfil these features, leading to more and more complex management and configuration. Along with encompassing state of art and novel techniques for such diversely dynamic system, in this thesis two alternative techniques namely “task initiation by command” and “run-time task deployment and processing” are compared, for such system’s setup and configuration. Both techniques have their own pros and cons which makes them suitable according to the requirements and contextual situations. A lot of effort has been put to make WSNs more and more efficient in terms of computations and power consumption. Hence comparative analysis of both techniques used in this report to setup and configure WSN can be a benchmark to lead towards most appropriate solution to compensate the need of efficient energy and resource consumption.Both alternative schemes are implemented to setup WSN on Sun Microsystems sunSPOT (Small Programmable Object Technology) sensor nodes which are embedded microcontrollers and programmed them in java (j2me). It performs radio communication between wireless sensors and host via sink node also called base station, along with over the air run-time management of sensors. SunSPOTs built in libraries and KSN libraries are used to implement these alternatives and compare the memory footprint, communication pattern and energy consumption.Exploitation of wireless sensor networks (WSNs) in ubiquitous computing environments is continuously increasing for gathering data. Contemporary distributed software systems on WSNs for pragmatic business applications have become extremely adaptive, dynamic, heterogeneous and large scaled. Management of such system is not trivial to fulfil these features, leading to more and more complex management and configuration. Along with encompassing state of art and novel techniques for such diversely dynamic system, in this thesis two alternative techniques namely “task initiation by command” and “run-time task deployment and processing” are compared, for such system’s setup and configuration. Both techniques have their own pros and cons which makes them suitable according to the requirements and contextual situations. A lot of effort has been put to make WSNs more and more efficient in terms of computations and power consumption. Hence comparative analysis of both techniques used in this report to setup and configure WSN can be a benchmark to lead towards most appropriate solution to compensate the need of efficient energy and resource consumption.Both alternative schemes are implemented to setup WSN on Sun Microsystems sunSPOT (Small Programmable Object Technology) sensor nodes which are embedded microcontrollers and programmed them in java (j2me). It performs radio communication between wireless sensors and host via sink node also called base station, along with over the air run-time management of sensors. SunSPOTs built in libraries and KSN libraries are used to implement these alternatives and compare the memory footprint, communication pattern and energy consumption.
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Govindaraj, Santhosh. "Calculation of sensor redundancy degree for linear sensor systems." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/503.
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The rapid developments in the sensor and its related technology have made automation possible in many processes in diverse fields. Also sensor-based fault diagnosis and quality improvements have been made possible. These tasks depend highly on the sensor network for the accurate measurements. The two major problems that affect the reliability of the sensor system/network are sensor failures and sensor anomalies. The usage of redundant sensors offers some tolerance against these two problems. Hence the redundancy analysis of the sensor system is essential in order to clearly know the robustness of the system against these two problems. The degree of sensor redundancy defined in this thesis is closely tied with the fault-tolerance of the sensor network and can be viewed as a parameter related to the effectiveness of the sensor system design.
In this thesis, an efficient algorithm to determine the degree of sensor redundancy for linear sensor systems is developed. First the redundancy structure is linked with the matroid structure, developed from the design matrix, using the matroid theory. The matroid problem equivalent to the degree of sensor redundancy is developed and the mathematical formulation for it is established. The solution is obtained by solving a series of l1-norm minimization problems. For many problems tested, the proposed algorithm is more efficient than other known alternatives such as basic exhaustive search and bound and decomposition method.
The proposed algorithm is tested on problem instances from the literature and wide range of simulated problems. The results show that the algorithm determines the degree of redundancy more accurately when the design matrix is dense than when it is sparse. The algorithm provided accurate results for most problems in relatively short computation times.
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Costa, Ana Ravena Alcântara da. "Avaliação de um sensor capacitivo para o melhoramento de perdas durante a colheita mecanizada da cana-de-açúcar." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/262022.
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Orientador: Carlos Alberto dos Reis FilhoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: O plantio e a colheita da cana-de-açúcar são atividades da agroindústria brasileira que ainda possuem uma série de desafios tecnológicos. Dentre esses desafios destaca se a busca de uma solução adequada para a redução das perdas associadas à separação da cana da palha durante a colheita. O trabalho que foi desenvolvido buscou solucionar este particular problema, avaliando a adequação de um sistema de placas condutoras paralelas ao monitoramento contínuo do fluxo da mistura entre elas. Considerando que a cana-de-açúcar possui alto teor de umidade, foram realizadas simulações com o software COMSOL para avaliar o impacto da adição de um material com constante dielétrica próxima à da água com diferentes orientações em um meio formado predominantemente por ar. Um circuito com excitação DC foi projetado e os resultados da medição comparados com os de um circuito AC. Os valores obtidos com cana e palha recém-colhidas mostraram que a palha seca não altera significativamente a capacitância medida, mas a palha verde e a cana influenciam de forma determinante. Apesar da interferência alta, que chegou ao patamar de 50 mV, a presença dos toletes de cana foi detectável dependendo da sua orientação e distribuição no interior do sistema de placas. A variação de capacitância encontrada para um único tolete com comprimento de 86 cm na direção longitudinal ao campo chegou a 61fF. Por outro lado, os testes e simulações também mostraram que a distribuição de material na direção do campo elétrico aplicado influencia de maneira mais importante que a diferença entre as constantes elétricas do meio e do material adicionado
Abstract: Plantation and harvesting of sugar cane are agricultural activities in Brazil that still have a number of technological challenges. Among them the search for a suitable solution to reduce losses in the separation of cane and dry or fresh leaves during harvesting shows up. The developed work searched for a solution to this specific problem and evaluated a system of parallel conducting plates to continuous monitoring the flux between them of a mixture of sugar cane and vegetable impurities. Considering a high moisture content for sugar cane, simulations with COMSOL software were conducted to evaluate the impacts of a material with a dielectric constant near to that of water in different orientations and distributions in a medium formed mainly by air. A circuit with DC excitation was developed and the measuring results were compared to those of an AC circuit. The values with cane and fresh leaves showed that when dried leaves are present capacitance variations are negligible, but cane and green leaves are determinants. Despite of strong interferences, which reached voltage oscillations up to 50mV the presence of cane billets was detectable depending on its orientation and distribution within the sensor arrangement. Capacitance variations due to a single cane billet with 86cm in length on a longitudinal orientation to the field reached 61fF. On the other hand, tests and simulations showed that material distribution in the direction of the electric field influences in a stronger way than the difference between dielectric constants of the medium and the added material
Mestrado
Eletrônica, Microeletrônica e Optoeletrônica
Mestra em Engenharia Elétrica
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Johansson, Marcus. "Energy-efficient sensor management : How dynamic sensor management affects energy consumption in battery-powered mobile sensor devices." Thesis, Högskolan i Skövde, Institutionen för kommunikation och information, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-6114.
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This thesis has investigated how the energy consumption can be reduced in a mobile sensor unit by using a dynamic measurement scheme. This was done by developing a scheme based on inspiration from existing works in related areas and on techniques found in literature. The developed scheme was then implemented on a mobile sensor unit and tests were conducted where the energy consumed by the scheme was measured. This was compared to a static baseline approach in order to evaluate the efficiency of the scheme. The results showed that on the platform used in this thesis the developed scheme can reduce the energy consumption in a typical scenario by 4.7% or 6.7% depending on which sensors are used. A conclusion drawn is that the platform has a major impact on how effective the scheme can be.
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Erdelj, Milan. "Mobile wireless sensor network architecture : applications to mobile sensor deployment." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2013. http://tel.archives-ouvertes.fr/tel-00914987.
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Les progrès de la robotique mobile nous permettent aujourd'hui d'ajouter la notion de mobilité dans plusieurs classes de réseaux de capteurs sans fil. Le déploiement de capteurs mobiles est possible et utile dans de nombreuses applications, comme la surveillance de l'environnement, les applications dans l'industrie, dans la santé et le domaine militaire. Le terme robot mobile peut représenter n'importe quel type de robot avec la capacité de modifier sa position. Cette notion inclut une vaste gamme de robots industriels utilisés dans les lignes de production. Dans le contexte spécifique de cette thèse, l'attention se focalise uniquement sur les robots mobiles et plus particulièrement les véhicules autonomes dont les mouvements ne sont pas limités par leur taille physique. Ainsi, un robot ou un groupe de robots mobiles peuvent être utilisés pour explorer des environnements inconnus et effectuer une variété de fonctions. La mobilité du robot dans le contexte des réseaux de capteurs, nous permet de résoudre les problèmes qui ne pourraient pas être résolues dans un cas statique. Les robots mobiles permettent d'augmenter la robustesse du réseau en remplaçant des nœuds de capteurs et de s'adapter aux environnements inconnus ou dynamiques. Deux thèmes sont abordées dans cette thèse : la conception d'un intergiciels pour les réseaux de robots mobiles et un ensemble d'approches pour le déploiement de robots mobiles dans le cadre de réseaux de capteurs sans fil. L'intergiciel proposé et décrit dans cette thèse permet à l'utilisateur de facilement mettre en œuvre différents types d'algorithmes de déploiement pour les robots mobiles. Il permet de déployer une application sur la station de base centrale qui permet à un utilisateur de rassembler toutes les informations captées par la flotte de robots. L'application de la station de base permet à un utilisateur d'envoyer des commandes à un groupe ou à un robot, introduisant ainsi la commande manuelle en option dans le réseau robotique. L'intergiciel présenté dans ce travail est dédié à être utilisé avec des robots mobiles Wifibot. Il permet réaliser plusieurs tâches. Tout d'abord, il interagit avec le microgiciel du robot pour piloter les moteurs des roues et recueille les informations concernant la sortie du capteur et de l'état de la batterie. Deuxièmement, il gère la communication avec d'autres robots et les stations de base du réseau. Troisièmement, il traite les informations sur l'environnement et les messages reçus des voisins dans le réseau. Enfin, il réagit et il s'adapte de manière rapide et fiable pour aux événements de l'environnement. Dans la deuxième partie de la thèse, trois problèmes sont présentés et analysés : le problème de l'amélioration de la qualité de service avec l'utilisation des réseaux robotiques mobiles, la couverture du point d'intérêt avec des robots mobiles et la découverte de points d'intérêt et leur couverture avec l'utilisation des robots mobiles. Le premier problème est résolu avec l'utilisation de l'algorithme de déploiement qui améliore les performances de la transmission multimédia. Cet algorithme utilise une méthode intrusive pour réunir les métriques de qualité de service. Ensuite, l'attention est focalisé sur l'application des réseaux de capteurs sans fil est la surveillance de l'environnement. Au lieu de surveiller toute la région, couvrir seulement un ensemble de points d'intérêt spécifiques accroît les performances du réseau et réduit le coût de déploiement. Nous faison l'hypothèse que la station de base fixe est placé à l'intérieur du domaine d'intérêt, tandis que les robots mobiles disponibles couvrent le point d'intérêt et relayent l'information vers la station de base. L'approche pour résoudre le dernier problème est basée sur le mouvement continu et à vitesse variable de capteurs mobiles, qui suivent des trajectoires circulaires concentriques afin d'explorer et de couvrir le domaine d'intérêt. En se déplaçant constamment, les capteurs exécutent la tâche de découverte de l'environnement et, en ajustant la vitesse de déplacement, ils répondent aux contraintes de la couverture et la connectivité avec la station de base. L'algorithme installé sur tous les capteurs mobiles est distribué et introduit une nouvelle technique de calcul de la vitesse en fonction des informations disponibles à partir des capteurs dans le voisinage à un-saut. Ces algorithmes de déploiement de robots mobiles ont prouvé leur faisabilité à travers de nom- breuses simulations ainsi que dans la mise en pratique en s'appuyant sur l'intergiciel proposé.
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Ali, Arshad. "Advanced sensor positioning in wireless sensor nerworks using kriging interpolation." Thesis, Lancaster University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.659448.
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Wireless Sensor Networks (WSN) have an important role to play in applications involving surveillance, security and autonomous systems. Furthermore, recent technological advances have allowed wireless sensor networks to be applied to a plethora of areas such as environment monitoring, traffic control, health, agriculture, medical, home applications, as well as fire fighting, and object tracking. One of the main, generic WSN requirements is the collection of large amounts of data which can be afterwards used in classification and decision making processes. Within such a general WSN framework, this dissertation studies sensor node positioning strategies. Thus given a fixed number of sensors operating in a completely unknown environment, work is focussed on the development of efficient sensor positioning techniques. Efficiency here relates to i) collection of data in order to characterize (for a given accuracy) the environment, with a minimum number of sensor moving steps i.e. as quickly as possible, and ii) the location and tracking of major features of the environment, for example the maxima of data distributions used to form in simulations the data profile of a given environment. Furthermore, the above WSN movement/positioning methodologies are applied to both data static and data dynamic environments. Note that these methodologies contain two key processes: i) data interpolation; and data prediction as applied to trajectories of moving environment features. Thus WSN data is interpolated using a form of Kriging interpolation whereas prediction is performed using a polynomial based approach. Experimentation has been performed using computer simulation of proposed methods and experimental results are presented in the thesis which allows proposed schemes to be compared in terms of different criteria. Results associated to systems employing ground truth data, as a substitute for ideal interpolation and prediction processes, are also presented and are taken as providing bounds of system performance.
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Hu, Xi. "Network and sensor management for mulitiple sensor emitter location system." Diss., Online access via UMI:, 2008.
Find full textAbstract:
Thesis (Ph. D.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Electrical and Computer Engineering, 2008.Includes bibliographical references.
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Adulyasas, Attapol. "Connected coverage assurance for sensor scheduling in wireless sensor networks." Thesis, University of Surrey, 2015. http://epubs.surrey.ac.uk/809497/.
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A long operational lifetime is one of ultimate goals of wireless sensor networks (WSNs) due to the limited energy resources of sensors. As sensors are often randomly deployed in vast and inaccessible areas, it is impractical to recharge or replace their energy resources such as batteries. Thus, energy efficiency is likely to be a highly important issue for the WSNs. A key approach to enhancing energy efficiency is sensor scheduling. Sensor scheduling means that in each operational round certain sensors are selected to be active, whilst others are pushed into sleep mode. However, the required quality of sensing coverage and network connectivity must be guaranteed. The former is that the entire monitored area must be fully covered at a given level called a desired coverage degree (k). Meanwhile, the latter is that every active sensor must be connected with others. Both properties together are known as the connected coverage assurance. This thesis proposes a series of sensor scheduling methods, namely 6-Triangle (6-Tri), 4-Square (4-Sqr), 3-Symmetrical area (3-Sym) and Optimum-Symmetrical area (O-Sym). The 6-Tri method uses a hexagon tessellation as a virtual partition in order to group sensors into hexagonal cells. This method activates 6 sensors from each cell. Otherwise, the 4-Sqr method uses a virtual square partition instead in order to divide the sensors into square cells. A cell consists of 4 sub-squares, within each of which a sensor is activated. Similar to the 6-Tri method, the 3-Sym method has a hexagon tessellation as its virtual partition. As only three sensors whose position is symmetrical with each other are selected in each cell, the 3-Sym method can significantly reduce the number of active sensors, compared to both the 6-Tri and 4-Sqr methods. The O-Sym method enhances the 3-Sym method by optimising coverage efficiency. It firstly investigates coverage redundancy, which is produced by the 3-Sym method, and then tries to minimise the redundancy to the desired coverage degree. This method achieves both energy efficiency and coverage efficiency, which are the main objectives of this thesis.
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Kangerud, Jim. "Sensor Fusion : Applying sensor fusion in a district heating substation." Thesis, Blekinge Tekniska Högskola, Avdelningen för för interaktion och systemdesign, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4884.
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Many machines in these days have sensors to collect information from the world they inhabit. The correctness of this information is crucial for the correct operation. However, at times sensors are not so reliable since they are sometimes affected of some type of noise and thus give incorrect information. Another drawback might be lack of information due to shortage of existing sensors. Sensor fusion is trying to overcome these drawbacks by integrating or combining information from multiple sensors. The heating of a building is a slow and time consuming process, i.e. either the flow or energy consumption are object to drastically changes. On the other hand, the tap water system, i.e. the heating of tap water can be the source to severe changes in both flow and energy consumption. This because of that the flow is stochastic in the tap water system, at any given time a tap may be opened or closed and therefore drastically change the flow. The purpose of this thesis is to investigate if is it possible to use sensor fusion to get accurate continuous flow values from a district heating substation. This is done by integrating different sensor fusion algorithms in a district heating substation simulator.
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Jingjing, Hao. "Distributed sensor fault detection and isolation over wireless sensor network." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/254423.
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Wireless sensor networks (WSNs) can provide new methods for information gathering for a variety of applications. In order to ensure the network quality of service, the quality of the measurements has to be guaranteed. Distributed fault detection and isolation schemes are preferred to centralized solutions to diagnose faulty sensors in WSNs. Indeed the first approach avoids the need for a central node that collects information from every sensor node, and hence it limits complexity and energy cost while improving reliability.In the case of state estimation over distributed architectures, the sensor faults can be propagated in the network during the information exchanging process. To build a reliable state estimate one has to make sure that the measurements issued by the different sensors are fault free. That is one of the motivations to build a distributed fault detection and isolation (FDI) system that generates an alarm as soon as a measurement is subject to a fault (has drift, cdots ). In order to diagnose faults with small magnitude in wireless sensor networks, a systematic methodology to design and implement a distributed FDI system is proposed. It resorts to distinguishability measures to indicate the performance of the FDI system and to select the most suitable node(s) for information exchange in the network with a view to FDI. It allows one to determine the minimum amount of data to be exchanged between the different nodes for a given FDI performance. In this way, the specifications for FDI can be achieved while the communication and computation cost are kept as small as possible. The distributed FDI systems are designed both in deterministic and stochastic frameworks. They are based on the parity space approach that exploits spacial redundancy as well as temporal redundancy in the context of distributed schemes. The decision systems with the deterministic method and the stochastic method are designed not only to detect a fault but also to distinguish which fault is occurring in the network. A case study with a WSN is conducted to verify the proposed method. The network is used to monitor the temperature and humidity in a computer room. The distributed FDI system is validated both with simulated data and recorded data.Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
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Börjesson, Johan, and Johan Nilsson. "Sensor för hydraulolja." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1647.
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This is the final documentation of the basis that can be the foundation of how to solve the
problem with leaking hydraulic oil in a shoe press at the company Albany International
AB in Halmstad, Sweden.
The project has been performed at Halmstad University as a degree project commissioned
by Albany International AB. The purpose of the degree project was to find a way of
detecting the hydraulic leak of a shoe press. The reason is that the shoe press runs
unattended during nights and weekends, this can cause an extensive decontamination
work and production stop if leak. The hydraulic oil could be leaking in large amounts or
slowly as a fine mist. The development of a working system that can detect a hydraulic
oil leak and stop the machine before a large amount of hydraulic oil leaks out would
considerably reduce the cost of the decontamination work. It would also reduce the
interruption time of the production. When the hydraulic oil is leaking as a fine mist and
spreading in the facility, the risk of fire is much higher and will be reduced if detected in
time.
The outcome of the degree project is this document containing results of investigations
and a suggestion on how to make a prototype. In benefit of investigations, inquiry and
tests the project group has been able to choose a suitable method of how to detect a
hydraulic leak. The prototype has been tested in laboratory environment and showed a
god ability to detect hydraulic oil.
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Trolliet, Alexia. "Pressure Sensor Miniaturization." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175784.
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As far as the Printed Circuit Boards (PCB) manufacture industry is concerned, for high production volumes, solder paste is applied on the connection pads through customized stencils. This is a very productive method, yet if the design has to be updated, cost is increasing as the stencil should be changed. For higher exibility, such as in rapid prototyping, jet-printing machines similar to Mycronic MY500 are used. In these equipments, solder paste is jet-printed on the circuit board. The shooting is done by a piston moving on the vertical axis at high speed, hence projecting solder paste onto the connection pads of the PCB. In order to improve the understanding of the jetting process, it is important to collect data on pressure uctuations in the jetting head. To do so, this project is using a strain gauge to sense the strain applied by the piston on the nozzle. The gauge is connected in a Wheatstone bridge, and the differential signal is extracted and amplified a first time with an instrumentation amplifier. The remaining amplification is then performed with the help of an operational amplifier so that the signal matches the Analog to Digital Converter (ADC) levels. Finally, the converted results are transmitted to a personal computer for further analysis.
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Fraher, Patrick M. A. "Environmental sensor validation." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308651.
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Wadhawan, Jay D. "Electrochemical sensor engineering." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.483494.
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KARLSSON, SIMON, and YOUSEF TAVAKOLI. "Unified Flow Sensor." Thesis, KTH, Tillämpad maskinteknik (KTH Södertälje), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-139107.
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Ismail, Abd Khamim. "MEMS mass sensor." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430353.
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Haala, Norbert. "Multi-Sensor-Photogrammetrie." [S.l. : s.n.], 2005. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-26984.
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Assam, Aieat. "Sensor-enhanced imaging." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4268/.
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Most approaches to spatial image management involve GPS or image processing. In this thesis, a sensor-focused alternative is explored. It requires user and camera tracking, particularly challenging in indoor environments. Possible indoor tracking methods are evaluated and pedestrian dead reckoning is selected. A study is conducted to evaluate sensors and choose a combination for pedestrian and camera tracking. Gyroscope and accelerometer offer comparable step detection performance, with gyroscope and tilt compensated compass providing heading data. Images taken from the same viewpoint are successfully arranged using panorama stitching without any image processing. The results compare favourably to conventional methods. While lacking visual definition of image processing methods, they can complement them if used in tandem. Sensor compositing and pedestrian tracking are implemented in a unified system. Several methods for fusing compass and gyroscope data are compared, but do not produce statistically significant improvement over using just the compass. The system achieves loop closure accuracy of 91% of path length and performs consistently across multiple participants. The final system can be used in GPS-denied locations and presents an image content independent way of managing photographs. It contributes to pedestrian tracking and image composting fields and has potential commercial uses (illustrated by an example Android app).
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Simkhada, Shailendra, Christopher Lee, David Venderwerf, Miranda Tyree, and Tyler Lacey. "Wireless Sensor Network." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595644.
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ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, NevadaThe scope of this document is the description of design and implementation of the wireless sensor network realized as a part of our Senior Design Capstone Project. The various components and sub-systems that comprise the final product are discussed, followed by the implementation procedures and results.
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Pereira, Maurício Neves Rodrigues da Silva. "Wearable optical sensor." Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/1947.
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Mestrado em Engenharia Electrónica e TelecomunicaçõesNeste trabalho foi desenvolvido um sensor para medição do ângulo de flexão do cotovelo de um indivíduo. Este sensor é uma ajuda na aferição da recuperação de uma pessoa que sofreu um acidente cardiovascular e que tenha perdido mobilidade no conjunto ombro-braço. Embora o sensor por si só não desempenhe uma função vital na recuperação de um paciente com as características referidas, espera-se que se torne uma ajuda na motivação da pessoa bem como uma maneira de quantificar o desenvolvimento por parte do profissional de saúde. Para este efeito, foi usada uma fibra óptica de plástico uma vez que reúne algumas características importantes para o trabalho a realizar, como é o caso do seu reduzido tamanho, peso e custo de produção, a sensibilidade a flexões macroscópicas e, devido ao diâmetro consideravelmente largo, facilidade em ser manuseada. Foram ainda investigados alguns métodos para tornar a referida fibra verdadeiramente sensível sendo também apresentados os resultados obtidos. Com o intuito de inovar, foi apresentado um novo método para a realização desta medição sendo o seu comportamento comparado com os procedimentos anteriores. No âmbito desta dissertação, o sensor foi também integrado num sistema inteligente que permite o envio dos valores obtidos para um computador, sendo possível posteriormente a sua representação numa aplicação gráfica para uma melhor visualização. Este sistema possui um módulo de comunicações sem fios que visa aumentar a liberdade de movimentos do utilizador durante a execução do teste bem como diminuir ao máximo o incómodo causado pelo sensor. ABSTRACT: In this work a sensor to measure the bending angle of the elbow of an individual was developed. This sensor is a helping tool to ascertain the degree of recovery of a person who suffered a cerebral vascular accident resulting in a loss of mobility of the shoulder-arm set. Although the sensor itself plays no vital role in recovery of a patient with the mentioned damages it is expected that it will become a mean of motivation of the patient and also a way of measuring the progress by the health professional. For this purpose a polymer optical fibre was used because it gathers some important features for the aim of this work such as being small and of little weight and not costly to develop, sensitive to macroscopic bendings and, due to its considerably large diameter, of easy handling. One has also investigated some methods to make the mentioned fibre truly sensitive to bending and the achieved results are also displayed. With the view to innovate a new method to perform this measurement is introduced and its behaviour compared to the previous procedures. Within the frame of this thesis, the sensor has also been integrated in a smart system that allows capture and transmission of the achieved results to a computer to enable their posterior graphical representation for a better vision. This system has a unit of wireless communication aiming the increase freedom of movement of the user during tests and also to reduce as far as possible the discomfort caused by wearing the sensor.
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Forsberg, Linus, and Maximilian Falkenström. "Mobile Sensor Gateway." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20464.
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Den här uppsatsen beskriver processen av att skapa en plattformsoberoende mobilapplikation för att koppla upp mobila enheter mot trådlösa sensorer med hjälp av Bluetooth Low Energy, samla in data från uppkopplade sensorer och ladda upp den insamlade datan till en molnlagringstjänst. Allt eftersom konsumenter och forskare använder fler sensorer och andra Bluetooth-enheter, [1] ökar behovet av simplare och standardiserade lösningar för att arbeta med dessa. En litteraturstudie har genomförts där information om närliggande forskning insamlats och viktig information om de nödvändiga mjukvarukomponenter som krävs har utvärderats. I kombination med litteraturstudien har en IT-artefakt utvecklats i form av en mobilapplikation som har testats utefter insamlade krav för att säkerställa applikationens funktionalitet. Syftet med det här arbetet är att tydliggöra och konkretisera en mjukvaruutvecklingsprocess som kan användas för att skapa en mobilapplikation av det här slaget, samt vilka potentiella svårigheter som finns i dagsläget med att utforma den här typen av applikationer. Resultaten visar att en del tillverkare inte följer standarden för Bluetooth-kommunikation, detta gör det svårt att skriva generaliserade metoder för att hämta data från sensorer av alla typer och från samtliga tillverkare.This thesis describes the process of creating a platform-independent mobile application for connecting mobile devices to wireless sensors using Bluetooth Low Energy, collecting data from connected sensors and uploading the collected data to a cloud storage service. As consumers and researchers use more sensors and other Bluetooth-devices, [1] one could argue that there is a need for simpler and standardised solutions to working with these. A literature study has been conducted where information on related research has been collected and important information about the necessary software components has been evaluated. In combination with the literature study, an IT artefact has been developed in the form of a mobile application that has been tested according to collected requirements to ensure the application's functionality. The purpose of this work is to contribute with a clear scientific process over what is required to create a mobile application of this kind and what potential difficulties exist in present-day design of this type of applications. The results show that some manufacturers may not be following the standards for Bluetooth data communication, thus making it hard to write generalized methods for retrieving data from sensors of any type or manufacturer.
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Schroeder, Wade Anthony. "Conductivity Sensor Circuit." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1429537491.
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Ward, Andrew Martin Robert. "Sensor-driven computing." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/252816.
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A context-aware computing system is one that can deduce the state of its surroundings using input from sensors and can change its behaviour accordingly. Context-aware devices might personalise themselves to their current user, alter their functionality based on where they were being used, or take advantage of nearby computing and communications resources. Location-aware systems, whose behaviour is determined by the positions of objects in the environment, represent a practical subset of the context-aware computing paradigm, and several systems of this nature have already been demonstrated. The location sensors used by those systems, however, report the positions of objects to only a room-scale granularity, limiting the extent to which devices and applications can adapt to their surroundings. Sensor technologies that can provide more detailed information about the locations of objects must therefore be investigated. This dissertation describes a new ultrasonic location sensor, which may be deployed in indoor environments such as offices and homes. The sensor can provide fine-grain , three-dimensional position and orientation information, and its characteristics are well suited to the demands of location-aware computing- the sensor is simple, low-powered and unobtrusive. Furthermore, the location system is scalable, in both the number of objects that it can track and the volume within which they may be monitored. A thorough assessment of the sensor's performance is presented in the dissertation, so that location-aware applications can be tailored to its properties. Subsequently, a software architecture that can efficiently distribute finegrain location information to applications is described. The software system provides support for the types of query that will be made frequently by location-aware applications, such as those concerning the spatial relationships between objects and their proximity to one another. The dissertation concludes by examining the use of the ultrasonic location sensor and software architecture to implement a set of novel location-aware applications.
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Pasca, Codrin. "Smart tactile sensor." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26741.
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This thesis presents an experimental smart tactile sensor system based on a 16-by-16 array of Force Sensing Resistor (FSR) elements. The tactile image data are acquired, memorized, and then transferred to a PC by an electronic interface using a PICmicro microcontroller. A user-friendly graphical user interface, integrates all the functions needed to acquire, process, display and save the tactile measurement data. Experiments on a set of 3D geometric symbols illustrate the functionality of the tactile sensor system. Finally, an application of the smart tactile sensor for robotic tactile object recognition is presented.
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Ferguson, Eugene M., and David J. Hepner. "PINHOLE YAWSONDE SENSOR." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/608333.
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International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, CaliforniaThe yawsonde is a device used at the U.S. Army Research Laboratory (ARL) to investigate the in-flight behavior of spinning projectiles. The standard yawsonde consists of a pair of solar cells and slits that respond to solar rays. The sun is used as an inertial reference to measure the pitching and yawing motions of the projectile. An FM telemetry package transmits the sensor data to a ground receiving station for analysis. The standard yawsonde package is housed in an M577-type artillery fuse body. The spinning motion of the projectile serves as the sampling rate for the measurements. When the spin rate is not significantly higher than the yaw rate, multiple sets of sensors must be used to effectively increase the sampling rate. The pinhole yawsonde sensor was developed for projectiles that require multiple sets of sensors in a very limited space. This pinhole yawsonde consists of a number of sensors located behind pinholes placed around the projectile's circumference. Since each pinhole makes a yaw measurement, many measurements, or samples, are taken with each projectile spin revolution. More pinhole sensors may be added to increase the measurement sampling rate. One application of this yawsonde is to aid in evaluating the performance of tactical devices and inertial systems onboard projectiles with limited space for instrumentation.
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Karaaslan, Ibrahim. "Anti-sensor Network: Distortion-based Distributed Attack In Wireless Sensor Networks." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609276/index.pdf.
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In this thesis, a novel anti-sensor network paradigm is introduced against wireless sensor networks (WSN). Anti-sensor network (ASN) aims to destroy application reliability by adaptively and anonymously introducing adequate level of artificial distortion into the communication of the event features transported from the sensor nodes (SN) to the sink. ASN is composed of anti-sensor nodes (aSN) randomly distributed
over the sensor network field. aSNs pretend to be SNs tomaintain anonymity and so improve resiliency against attack detection and prevention mechanisms. Performance
evaluations via mathematical analysis and simulation experiments show that ASN can effectively reduce the application reliability of WSN.
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Deleskog, Viktor. "Sensor Localization Calibration of Ground Sensor Networks with Acoustic Range Measurements." Thesis, Linköpings universitet, Reglerteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-81655.
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Advances in the development of simple and cheap sensors give new possibilities with large sensor network deployments in monitoring and surveillance applications. Commonly, the sensor positions are not known, specifically, when sensors are randomly spread in a big area. Low cost sensors are constructed with as few components as possible to keep price and energy consumption down. This implies that self-positioning and communication capabilities are low. So the question: “How do you localize such sensors with good precision with a feasible approach?” is central. When no information is available a stable and robust localization algorithm is needed. In this thesis an acoustic sensor network is considered. With a movable acoustic source a well-defined and audible signal is transmitted at different spots. The sensors measure the time of arrival which corresponds to distance. A two-step sensor localization approach is applied that utilizes the estimated distances. A novel approach in the first step is presented to incorporate more measurements and gain more position information. Localization and ranging performance is evaluated with simulations and data collected at field trials. The results show that the novel approach attains higher accuracy and robustness.
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Mereddy, Sandeep Reddy. "Adaptive algorithms for sensor activation in renewable energy-based sensor systems." Thesis, Wichita State University, 2009. http://hdl.handle.net/10057/2505.
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Future sensor networks would comprise of sensing devices with energy harvesting capabilities from renewable energy sources such as solar power. A key research question in such sensor systems is to maximize the asymptotic event detection probability achieved in the system, in the presence of energy constraints and uncertainties. This thesis focuses on the design of adaptive algorithms for sensor activation in the presence of uncertainty in the event phenomena. Ideas from increase/decrease algorithms used in TCP congestion avoidance are applied to design an online and adaptive activation algorithm that varies the subsequent sleep interval according to additive increase and multiplicative decrease based upon the sensor's current energy level. In addition, the proposed algorithm does not depend on global system parameters, or on the degree of event correlations, and hence can easily be deployed in practical scenarios. Through extensive simulations, it is demonstrated that the proposed algorithm not only achieves near-optimal performance, but also exhibits more stability with respect to sensor's energy level and sleep interval variations.Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical Engineering and Computer Science
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Singh, Abhay Kumar. "Sensor network and soft sensor design for stable nonlinear dynamic systems." Diss., Texas A&M University, 2006. http://hdl.handle.net/1969.1/4326.
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In chemical processes, online measurements of all the process variables and parameters required for process control, monitoring and optimization are seldom available. The use of soft sensors or observers is, therefore, highly significant as they can estimate unmeasured state variables from available process measurements. However, for reliable estimation by a soft sensor, the process measurements have to be placed at locations that allow reconstruction of process variables by the soft sensors. This dissertation presents a new technique for computing an optimal measurement structure for state and parameter estimation of stable nonlinear systems. The methodology can compute locations for individual sensors as well as networks of sensors where a trade-off between process information, sensor cost, and information redundancy is taken into account. The novel features of the approach are (1) that the nonlinear behavior that a process can exhibit over its operating region can be taken into account, (2) that the technique is applicable for systems described by lumped or by distributed parameter models, (3) that the technique reduces to already established methods, if the system is linear and only some of the objectives are examined, (4) that the results obtained from the procedure can be easily interpreted, and (5) that the resulting optimization problem can be decomposed, resulting in a significant reduction of the computational effort required for its solution. The other issue addressed in this dissertation is designing soft sensors for a given measurement structure. In case of high-dimensional systems, the application of conventional soft sensor or observer designs may not always be practical due to the high computational requirements or the resulting observers being too sensitive to measurement noise. To address these issues, this dissertation presents reduced-order observer design techniques for state estimation of high-dimensional chemical processes. The motivation behind these approaches is that subspaces, which are close to being unobservable, cannot be correctly reconstructed in a realistic setting due to measurement noise and inaccuracies in the model. The presented approaches make use of this observation and reconstruct the parts of the system where accurate state estimation is possible.
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Wang, Will (Wei). "Analysis of an implantable lactate sensor mathematical modeling of sensor response." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p1450158.
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Thesis (M.S.)--University of California, San Diego, 2008.Title from first page of PDF file (viewed March 25, 2008). Available via ProQuest Digital Dissertations. Includes bibliographical references (p. 99-105).
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Karlsson, Anna. "Device Sensor Fingerprinting : Mobile Device Sensor Fingerprinting With A Biometric Approach." Thesis, Linköpings universitet, Informationskodning, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119341.
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The number of connected devices connected to the Internet is growing rapidly. When talking about devices it also covers the ones not having any contact with humans. This type of devices are the ones that are expected to increase the most. That is why the field of device fingerprinting is an area that requires further investigation. This thesis measures and evaluates the accelerometer, camera and gyroscope sensor of a mobile device to the use as device fingerprinting. The method used is based on previous research in sensor identification together with methods used for designing a biometric system. The combination with long-proven methods in the biometric area with new research of sensor identification is a new approach of looking at device fingerprinting.
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Al-Saleh, Mohammad. "Sensor Package Analysis and Simulation for Direct Sensor-to-Satellite Links." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/76907.
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This thesis investigates the design and the performance of low-power microsensors that communicate directly to a satellite or a constellation of satellites. Information is spread using pseudo noise (PN) or Barker codes. The sensors use a single circular microstrip patch element with a wide beamwidth or a miniature phased array antenna that continuously scans to access the satellite(s). The array beam is controlled with a beam-forming network (BFN), which contains 3 or 4-bit phase shifters, which can be made in micro-electro-mechanical systems (MEMS) or in monolithic microwave integrated circuits (MMIC). The antennas are designed using array simulation program called 'ARRAY' and the results are used in another simulation program called Advanced Design System (ADS) to simulate the whole sensor package that uses one of the antennas. The simulation results show that a sensor as small as 2.35 cm in diameter is able to send information with data rate of 1 kbps at bit error rate less than 10?? to low-earth orbit (LEO) satellites with a transmitted power of 27.5 microwatts (-15.6 dBm).Master of Science