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Dissertations / Theses on the topic 'Neural fields'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 June 2024

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1

Ueda, Hiroyuki. "Studies on low-field functional MRI to detect tiny neural magnetic fields." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263666.

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付記する学位プログラム名: 京都大学卓越大学院プログラム「先端光・電子デバイス創成学」<br>京都大学<br>新制・課程博士<br>博士(工学)<br>甲第23205号<br>工博第4849号<br>京都大学大学院工学研究科電気工学専攻<br>(主査)教授小林哲生, 教授松尾哲司, 特定教授中村武恒<br>学位規則第4条第1項該当<br>Doctor of Philosophy (Engineering)<br>Kyoto University<br>DFAM

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2

Webber, Matthew. "Stochastic neural field models of binocular rivalry waves." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:c444a73e-20e3-454d-85ae-bbc8831fdf1f.

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Binocular rivalry is an interesting phenomenon where perception oscillates between different images presented to the two eyes. This thesis is primarily concerned with modelling travelling waves of visual perception during transitions between these perceptual states. In order to model this effect in such a way that we retain as much analytical insight into the mechanisms as possible we employed neural field theory. That is, rather than modelling individual neurons in a neural network we treat the cortical surface as a continuous medium and establish integro-differential equations for the activi

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3

Davenport, Christopher M. "Neural circuitry of retinal receptive fields in primate /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/10652.

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4

Arocena, Miguel. "Control of neural stem cell migration by electric fields." Thesis, University of Aberdeen, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540498.

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Neural stem cells showed strong electrotaxis, evidenced by highly directed migration towards the cathode. Optimal electrotaxis was found to require growth factors and phosphoinositide 3-kinase (PI3-K) signalling, although reduced electrotaxis could be obtained without growth factors at the highest EFs used. After EF exposure, neural stem cell trajectories became much more linear, and a reduction in the number of cell protrusions oriented towards the anode was observed. Also, protrusions initially orienting towards the cathode retracted after the polarity of the EF was reversed, suggesting t

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5

Ferguson, Archibald Stewart. "Theoretical calculation of magnetic fields generated by neural currents." Case Western Reserve University School of Graduate Studies / OhioLINK, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=case1055524502.

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6

Qi, Yang. "Anomalous neural pattern dynamics: formation mechanisms and functional roles." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18808.

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Spatiotemporal activity patterns with complex dynamics have been widely observed in the cortex, but their formation mechanisms and functional roles remain unclear. In this thesis, we first analyze how interactions of distributed bump activity patterns give rise to anomalous subdiffusive dynamics. Unlike normal diffusion whose mean squared error in representing working memory increases linearly with time, subdiffusion is characterized by a sublinear increase in its error, thereby significantly reducing memory degradation. The computational role of subdiffusive pattern dynamics in working memory

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7

Rohlén, Andreas. "UAV geolocalization in Swedish fields and forests using Deep Learning." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-300390.

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The ability for unmanned autonomous aerial vehicles (UAV) to localize themselves in an environment is fundamental for them to be able to function, even if they do not have access to a global positioning system. Recently, with the success of deep learning in vision based tasks, there have been some proposed methods for absolute geolocalization using vison based deep learning with satellite and UAV images. Most of these are only tested in urban environments, which begs the question: How well do they work in non-urban areas like forests and fields? One drawback of deep learning is that models are

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8

Curtis, Maurice A. "Neural progenitor cells in the Huntington's Disease human brain." Thesis, University of Auckland, 2004. http://hdl.handle.net/2292/3114.

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The recent demonstration of endogenous progenitor cells in the adult mammalian brain raises the exciting possibility that these undifferentiated cells may be able to generate new neurons for cell replacement in diseases such as Huntington's disease (HD). Previous studies have shown that neural stem cells in the rodent brain subependymal layer (SEL), adjacent to the caudate nucleus, proliferate and differentiate into neurons and glial cells but no previous study has characterised the human SEL or shown neurogenesis in the diseased human brain. In this study, histochemical and immunohistochemica

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9

Zhang, Yiming. "Applications of artificial neural networks (ANNs) in several different materials research fields." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/362.

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In materials science, the traditional methodological framework is the identification of the composition-processing-structure-property causal pathways that link hierarchical structure to properties. However, all the properties of materials can be derived ultimately from structure and bonding, and so the properties of a material are interrelated to varying degrees. The work presented in this thesis, employed artificial neural networks (ANNs) to explore the correlations of different material properties with several examples in different fields. Those including 1) to verify and quantify known corr

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10

Harris, William H. (William Hunt). "Machine learning transferable physics-based force fields using graph convolutional neural networks." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/128979.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2020<br>Cataloged from student-submitted PDF of thesis.<br>Includes bibliographical references (pages 22-24).<br>Molecular dynamics and Monte Carlo methods allow the properties of a system to be determined from its potential energy surface (PES). In the domain of crystalline materials, the PES is needed for electronic structure calculations, critical for modeling semiconductors, optical, and energy-storage materials. While first principles techniques can be used to obtain the PES to high accur

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11

Veltz, Romain, and Romain Veltz. "Nonlinear analysis methods in neural field models." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00686695.

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This thesis deals with mesoscopic models of cortex called neural fields. The neural field equations describe the activity of neuronal populations, with common anatomical / functional properties. They were introduced in the 1950s and are called the equations of Wilson and Cowan. Mathematically, they consist of integro-differential equations with delays, the delays modeling the signal propagation and the passage of signals across synapses and the dendritic tree. In the first part, we recall the biology necessary to understand this thesis and derive the main equations. Then, we study these equati

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12

Liu, Xinhe. "Implementation of dynamical systems with plastic self-organising velocity fields." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19550.

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To describe learning, as an alternative to a neural network recently dynamical systems were introduced whose vector fields were plastic and self-organising. Such a system automatically modifies its velocity vector field in response to the external stimuli. In the simplest case under certain conditions its vector field develops into a gradient of a multi-dimensional probability density distribution of the stimuli. We illustrate with examples how such a system carries out categorisation, pattern recognition, memorisation and forgetting without any supervision.

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13

Veltz, Romain. "Nonlinear analysis methods in neural field models." Thesis, Paris Est, 2011. http://www.theses.fr/2011PEST1056/document.

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Cette thèse traite de modèles mésoscopiques de cortex appelés champs neuronaux. Les équations des champs neuronaux décrivent l'activité corticale de populations de neurones, ayant des propriétés anatomiques/fonctionnelles communes. Elles ont été introduites dans les années 1950 et portent le nom d'équations de Wilson et Cowan. Mathématiquement, elles consistent en des équations intégro-différentielles avec retards, les retards modélisant les délais de propagation des signaux ainsi que le passage des signaux à travers les synapses et l'arbre dendritique. Dans la première partie, nous rappelons

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14

Prisilla, L., P. Simon Vasantha Rooban, and L. Arockiam. "A Novel Method for Water irrigation System for paddy fields using ANN." IJCSN, 2012. http://hdl.handle.net/10150/219532.

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In our country farmers have to face many difficulties because of the poor irrigation system. During flood situation, excessive waters will be staged in paddy field producing great loss and pain to farmers. So, proper Irrigation mechanism is an essential component of paddy production. Poor irrigation methods and crop management are rapidly depleting the country’s water table. Most small hold farmers cannot afford new wells or lawns and they are looking for alternative methods to reduce their water consumption. So proper irrigation mechanism not only leads to high crop production but a

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15

Hutt, Axel. "The study of neural oscillations by traversing scales in the brain." Habilitation à diriger des recherches, Université de Nice Sophia-Antipolis, 2011. http://tel.archives-ouvertes.fr/tel-00603975.

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16

Johnson, Jeffrey S. "A dynamic neural field model of visual working memory and change detection." Diss., University of Iowa, 2008. http://ir.uiowa.edu/etd/12.

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17

McNair, Nicolas A. "Input-specificity of sensory-induced neural plasticity in humans." Thesis, University of Auckland, 2008. http://hdl.handle.net/2292/3285.

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The aim of this thesis was to investigate the input-specificity of sensory-induced plasticity in humans. This was achieved by varying the characteristics of sine gratings so that they selectively targeted distinct populations of neurons in the visual cortex. In Experiments 1-3, specificity was investigated with electroencephalography using horizontally- and vertically-oriented sine gratings (Experiment 1) or gratings of differing spatial frequency (Experiments 2 & 3). Increases in the N1b potential were observed only for sine gratings that were the same in orientation or spatial frequency as t

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18

Jenkins, Glenn Llewellyn. "Evolved neural network approximation of discontinuous vector fields in unit quaternion space (S³) for anatomical joint constraint." Thesis, University of South Wales, 2007. https://pure.southwales.ac.uk/en/studentthesis/evolved-neural-network-approximation-of-discontinuous-vector-fields-in-unit-quaternion-space-s3-for-anatomical-joint-constraint(f375e712-038c-4a78-862a-944c0e36e360).html.

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The creation of anatomically correct three-dimensional joints for the simulation of humans is a complex process, a key difficulty being the correction of invalid joint configurations to the nearest valid alternative. Personalised models based on individual joint mobility are in demand in both animation and medicine [1]. Medical models need to be highly accurate animated models less so, however if either are to be used in a real time environment they must have a low temporal cost (high performance). This work briefly explores Support Vector Machine neural networks as joint configuration classif

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19

AL-Rashidi, Abdulrahman F. "Designing neural networks for the prediction of the drilling parameters for Kuwait oil and gas fields." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1209.

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Thesis (M.S.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains x, 76 p. : ill. (some col.), map (some col.). Includes abstract. Includes bibliographical references (p. 54-55).

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20

Lohmann, Kenneth John. "Neural correlates of magnetic field detection and geomagnetic orientation by the marine mollusk Tritonia diomedea / by Kenneth John Lohmann." Thesis, Connect to this title online; UW restricted, 1988. http://hdl.handle.net/1773/5247.

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21

Liu, Xiaochen. "Modelling Functional Maps and Associated Visual Gamma Activities in the Primary Visual Cortex." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/28536.

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The mammalian primary visual cortex (V1) has been extensively studied over the last decades to probe the neural mechanisms behind visual perception of elementary visual features such as edges, direction of motion, and colour. Numerous experiments have visualized the ordered arrangement of various functional maps in V1 and measured the neural activity patterns associated with them. However, only a few studies have quantitatively modelled the influences of the spatial structure of the functional maps on the neural activities. Moreover, the experimental maps usually show a great degree of irregul

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22

Lang, Eva [Verfasser], Wilhelm [Akademischer Betreuer] Stannat, Wilhelm [Gutachter] Stannat, Dirk [Gutachter] Blömker, and Olivier [Gutachter] Faugeras. "Traveling waves in stochastic neural fields / Eva Lang ; Gutachter: Wilhelm Stannat, Dirk Blömker, Olivier Faugeras ; Betreuer: Wilhelm Stannat." Berlin : Technische Universität Berlin, 2016. http://d-nb.info/1156011817/34.

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23

Hallström, Eric. "Relation Extraction on Swedish Text by the Use of Semantic Fields and Deep Multi-Channel Convolutional Neural Networks." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-262494.

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This thesis makes two contributions to the research domain of relation extraction (RE), i.e., the automated discovery of semantic links in unstructured text. The first contribution is a method for creating a dataset for RE, and using it to create the first Swedish RE dataset involving nine relationships between persons, locations and vehicles. The second contribution is a variety of experiments on this new dataset providing baselines. The relation extraction systems created in this thesis include deep multi-channel convolutional neural networks, and Word2Vec embeddings. A manual labeling of a

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24

Sanz, Leon Paula. "Development of a computational and neuroinformatics framework for large-scale brain modelling." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM5036/document.

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The central theme of this thesis is the development of both a generalised computational model for large-scale brain networks and the neuroinformatics platform that enables a systematic exploration and analysis of those models. In this thesis we describe the mathematical framework of the computational model at the core of the tool The Virtual brain (TVB), designed to recreate collective whole brain dynamics by virtualising brain structure and function, allowing simultaneous outputs of a number of experimental modalities such as electro- and magnetoencephalography (EEG, MEG) and functional Magne

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25

Grehl, Stephanie. "Stimulation-specific effects of low intensity repetitive magnetic stimulation on cortical neurons and neural circuit repair in vitro (studying the impact of pulsed magnetic fields on neural tissue)." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066706/document.

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Les champs électromagnétiques sont couramment utilisés pour stimuler de manière non-invasive le cerveau humain soit à des fins thérapeutiques ou dans un contexte de recherche. Les effets de la stimulation magnétique varient en fonction de la fréquence et de l'intensité du champ magnétique. Les mécanismes mis en jeu restent inconnus, d'autant plus lors de stimulations à faible intensité. Dans cette thèse, nous avons évalué les effets de stimulations magnétiques répétées à différentes fréquences appliqués à faible intensité (10-13 mT ; Low Intensity Repetitive Magnetic Stimulation : LI-rMS) in v

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26

Ariza, Carlos Atico. "Topography, extracellular matrix proteins, secreted molecules and endogenous electric fields cues that influence the differentiation of neural progenitor cells /." [Ames, Iowa : Iowa State University], 2009. 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:3389082.

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27

Perone, Sammy. "Using dynamic neural fields to understand the development of metric representations in typically developing and at-risk infant populations." Diss., University of Iowa, 2010. https://ir.uiowa.edu/etd/872.

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During the past half-century, the experimental use of looking measures have led to many new discoveries about the origins of cognition. Across the first year, infants' looking changes in predictable ways, they form memories more quickly, and they begin to discriminate between subtly different stimuli. However, a rich understanding of the link between looking and cognitive dynamics has yet to be achieved. This was the overarching goal of this thesis. I developed a new Dynamic Field Theory of infant looking and memory and formally implemented this theory in a Dynamic Neural Field model. In Exper

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28

Yu, Hsin-Hao. "Integration of visual information and the organization of receptive fields in V1 of the California ground squirrel." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3283974.

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Thesis (Ph. D.)--University of California, San Diego, 2007.<br>Title from first page of PDF file (viewed January 8, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 112-124).

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29

Khouzam, Bassem. "Neural networks as cellular computing models for temporal sequence processing." Thesis, Supélec, 2014. http://www.theses.fr/2014SUPL0007/document.

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La thèse propose une approche de l'apprentissage temporel par des mécanismes d'auto-organisation à grain fin. Le manuscrit situe dans un premier temps le travail dans la perspective de contribuer à promouvoir une informatique cellulaire. Il s'agit d'une informatique où les calculs se répartissent en un grand nombre de calculs élémentaires, exécutés en parallèle, échangeant de l'information entre eux. Le caractère cellulaire tient à ce qu'en plus d’être à grain fin, une telle architecture assure que les connexions entre calculateurs respectent une topologie spatiale, en accord avec les contrain

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30

Köhler, Rolf [Verfasser], and Hendrik [Akademischer Betreuer] Lensch. "Advances in computational imaging : Benchmarking Deblurring Algorithms, Deep Neural Inpainting, Depth Estimation from Light Fields / Rolf Köhler ; Betreuer: Hendrik Lensch." Tübingen : Universitätsbibliothek Tübingen, 2016. http://d-nb.info/1164170279/34.

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31

Plaut, Maxwell Ethan. "Characterizing hydrogel imposed strain fields on brain tissue phantom for use in neural implant device coatings in presence of micromotion." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/89977.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 27-30).<br>Glial scar tissue forms in the brain as a response to the implant injury and hampers the effectiveness of the implant treatment. Constant relative micromotion between the mechanically mismatched neural implant and brain tissue is thought to play a key role glial scar formation. This study investigated the effects of poly(ethylene glycol) (PEG) hydrogel coatings for glass brain implant device

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32

Winter, Luca. "Algoritmy pro rozpoznávání pojmenovaných entit." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-320108.

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The aim of this work is to find out which algorithm is the best at recognizing named entities in e-mail messages. The theoretical part explains the existing tools in this field. The practical part describes the design of two tools specifically designed to create new models capable of recognizing named entities in e-mail messages. The first tool is based on a neural network and the second tool uses a CRF graph model. The existing and newly created tools and their ability to generalize are compared on a subset of e-mail messages provided by Kiwi.com.

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Lukačovič, Martin. "Segmentace obrazu s využitím hlubokého učení." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-317124.

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This thesis deals with the current methods of semantic segmentation using deep learning. Other approaches of neaural networks in the area of deep learning are also discussed. It contains historical solutions of neural networks, their development, and basic principle. Convolutional neural networks are nowadays the most preferable networks in solving tasks as detection, classification, and image segmentation. The functionality was verified on a freely available environment based on conditional random fields as recurrent neural networks and compered with the deep convolutional neural networks usi

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Hassan, K. J. "Application of artificial neural networks for understanding and diagnosing the state of mastitis in dairy cattle." Lincoln University, 2007. http://hdl.handle.net/10182/633.

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Bovine mastitis adversely affects the dairy industry around the world. This disease is caused by a diverse range of bacteria, broadly categorised as minor and major pathogens. In-line tools that help identify these bacterial groupings in the early stages of the disease are advantageous as timely decisions could be made before the cow develops any clinical symptoms. The first objective of this research was to identify the most informative milk parameters for the detection of minor and major bacterial pathogens. The second objective of this research was to evaluate the potential of supervise

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Ling, Hong. "Implementation of Stochastic Neural Networks for Approximating Random Processes." Master's thesis, Lincoln University. Environment, Society and Design Division, 2007. http://theses.lincoln.ac.nz/public/adt-NZLIU20080108.124352/.

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Artificial Neural Networks (ANNs) can be viewed as a mathematical model to simulate natural and biological systems on the basis of mimicking the information processing methods in the human brain. The capability of current ANNs only focuses on approximating arbitrary deterministic input-output mappings. However, these ANNs do not adequately represent the variability which is observed in the systems natural settings as well as capture the complexity of the whole system behaviour. This thesis addresses the development of a new class of neural networks called Stochastic Neural Networks (SNNs) in

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TAVARES, Hugo Saraiva. "Conjunto invariantes para tricotomia exponencial e aplicações a campos neurais." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1409.

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Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-08-11T14:07:58Z No. of bitstreams: 1 HUGO SARAIVA TAVARES - DISSERTAÇÃO PPGMAT 2016..pdf: 830543 bytes, checksum: d315a3d95e0d2b08d4251cbb487964b6 (MD5)<br>Made available in DSpace on 2018-08-11T14:07:58Z (GMT). No. of bitstreams: 1 HUGO SARAIVA TAVARES - DISSERTAÇÃO PPGMAT 2016..pdf: 830543 bytes, checksum: d315a3d95e0d2b08d4251cbb487964b6 (MD5) Previous issue date: 2016-06<br>Capes<br>Para ler o resumo deste trabalho recomendamos o download do arquivo, uma vez que o mesmo possui fórmulas e caracteres matemáticos que não fo

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Sun, Zhibin. "Application of artificial neural networks in early detection of Mastitis from improved data collected on-line by robotic milking stations." Lincoln University, 2008. http://hdl.handle.net/10182/665.

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Two types of artificial neural networks, Multilayer Perceptron (MLP) and Self-organizing Feature Map (SOM), were employed to detect mastitis for robotic milking stations using the preprocessed data relating to the electrical conductivity and milk yield. The SOM was developed to classify the health status into three categories: healthy, moderately ill and severely ill. The clustering results were successfully evaluated and validated by using statistical techniques such as K-means clustering, ANOVA and Least Significant Difference. The result shows that the SOM could be used in the robotic milki

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Förster, Jona. "ERP and MEG Correlates of Visual Consciousness : An Update." Thesis, Högskolan i Skövde, Institutionen för biovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-17375.

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Two decades of event-related potential (ERP) research have established that the most consistent correlates of the onset of visual consciousness are the early visual awareness negativity (VAN), a negative component in the N2 time range over posterior electrode sites, and the late positivity (LP), a positive component in the P3 time range over fronto-parietal electrode sites. A review by Koivisto & Revonsuo (2010) had looked at 39 studies and concluded that the VAN is the earliest and most reliable correlate of visual phenomenal consciousness, whereas the LP probably reflects later processes

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Uwamahoro, Jean. "An analysis of sources and predictability of geomagnetic storms." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1005236.

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Solar transient eruptions are the main cause of interplanetary-magnetospheric disturbances leading to the phenomena known as geomagnetic storms. Eruptive solar events such as coronal mass ejections (CMEs) are currently considered the main cause of geomagnetic storms (GMS). GMS are strong perturbations of the Earth’s magnetic field that can affect space-borne and ground-based technological systems. The solar-terrestrial impact on modern technological systems is commonly known as Space Weather. Part of the research study described in this thesis was to investigate and establish a relationship be

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Pontin, David R. "Factors influencing the occurrence of stinging jellyfish (Physalia spp.) at New Zealand beaches." Lincoln University, 2009. http://hdl.handle.net/10182/1580.

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Individuals of the cnidarian genus Physalia are a common sight at New Zealand beaches and are the primary cause of jellyfish stings to beachgoers each year. The identity of the species and the environmental factors that determine its presence are unknown. Lack of knowledge of many marine species is not unusual, as pelagic invertebrates often lack detailed taxonomic descriptions as well as information about their dispersal mechanisms such that meaningful patterns of distribution and dispersal are almost impossible to determine. Molecular systematics has proven to be a powerful tool for species

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Roy, Nipa. "Neural Field Theory of Nonlinear Wave-Wave and Wave-Neuron Processes." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18791.

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Biophysical processes related to the modulation of cellular mechanisms occur due to either presynaptic or postsynaptic effects. These processes involve some physiological phenomena whose different dynamics can potentially be distinguished via traces they leave in the power spectra of brain activity and/or connectivity fluctuations. Systematic expansion of NFT equations in terms of nonlinear response functions is formulated in Chapter 2 to enable a wide variety of nonlinear wave-wave and wave-neuron processes. This theory helps to handle neural quantities such as firing rates, neural field, som

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Venkov, Nikola A. "Dynamics of neural field models." Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517742.

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Chappet, de Vangel Benoît. "Modèles cellulaires de champs neuronaux dynamiques." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0194/document.

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Dans la recherche permanente de solutions pour dépasser les limitations de plus en plus visibles de nos architectures matérielles, le calcul non-conventionnel offre des alternatives variées comme l’ingénierie neuromorphique et le calcul cellulaire. Comme von Neumann qui s’était initialement inspiré du cerveau pour concevoir l’architecture des ordinateurs, l’ingénierie neuromorphique prend la même inspiration en utilisant un substrat analogique plus proche des neurones et des synapses. Le calcul cellulaire s’inspire lui des substrats de calcul naturels (chimique, physiques ou biologiques) qui i

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Kilingar, Nanda Gopala. "Generation and data-driven upscaling of open foam representational volume elements." Doctoral thesis, Universite Libre de Bruxelles, 2021. https://dipot.ulb.ac.be/dspace/bitstream/2013/313595/4/toc.pdf.

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In this work, a Representative Volume Element (RVE) generator based on the distance fields of arbitrary shaped inclusion packing is used to obtain morphologies of open-foam materials. When the inclusions are spherical, the tessellations of the resultant packing creates morphologies that are similar to physical foam samples in terms of their face-to-pore ratio, edge-to-face ratio and strut length distribution among others. Functions that combine the distance fields can be used to obtain the tessellations along with the necessary variations in the strut geometry and extract these open-foam morph

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Schmidt, Helmut. "Interface dynamics in neural field models." Thesis, University of Nottingham, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597110.

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Neural fields models have been developed. to emulate large scale brain dynamics. They exhibit similar types of patterns as observed in real cortical tissue, such as travelling waves and persistent localised activity. The study of neural field models is yet a growing field of research, and in this thesis we contribute by developing new approaches to the analysis of pattern formation. A particular focus is on interface methods in one and two spatial dimensions. In the first part of this thesis we Study the influence of inhomogeneities on the velocity of propagating waves. We examine periodically

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Bonaccini, Calia Andrea. "Graphene field-effect transistors as flexible neural interfaces for intracortical electrophysiology." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/671635.

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En els últims anys s’han produït desenvolupaments tecnològics innovadors en el camp dels implants neuronals per a aplicacions mèdiques. La comprensió de el cervell humà es considera com un dels majors reptes científics del nostre temps; com a conseqüència, estem sent testimonis d’una intensificació de la investigació en el desenvolupament de les interfícies cervell-màquina (IMC) per llegir i estimular l’activitat cerebral. No obstant això, els implants neuronals actualment disponibles ofereixen una eficàcia clínica modesta, en part a causa de les limitacions que plantegen la invasivitat dels m

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Martí, Edo Albert. "Transmissió de potencials d'acció basada en la propagació de camps elèctrics intra-membrana." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/457974.

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Current theories and mechanisms of nerve impulse propagation inside neurons do not give a satisfactory explanation to the nanoscale processes that occur inside the membrane. Propagation at the dendritic zones, and at the myelinated and unmyelinated axons, presents effects and events that, despite numerical calculations of current models fit with biological results obtained with macroscopic measurements, are far from giving an explanation to the real operation of biological mechanisms and to the effects and behaviors that the involved biological elements support. Current biological knowledge

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Zhao, Xue Long. "Bursting Dynamics in Corticothalamic Neural-Field Theory." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14201.

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A computationally efficient, biophysically-based model of single-neuron dynamics is studied. The model equations are shown to provide a wide array of physiological dynamics in terms of spiking patterns, bursting, sub-threshold oscillations, and chaotic firing. Despite its simplicity, the model is capable of simulating an extensive range of spiking patterns. This simple model is suitable for use in neural field theory . A variant of the single-neuron model is incorporated into a physiologically-based corticothalamic neural field model to study slow wave oscillations including cortical UP

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Canning, Andrew Magnus. "Ising spin models of partially connected neural networks." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/13304.

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Hurley, S. J. "Neutral hydrogen observations of three fields of galaxies." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376579.

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