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Dissertations / Theses on the topic 'Spatial frequencie'

Author: Grafiati

Published: 9 March 2023

Last updated: 19 July 2025

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1

SILVESTRI, VALENTINA. "AND I’LL SEE YOU IN THE HIGH AND LOW. The ontogenetic origins of sensitivity to facial cues to trustworthiness and emotion." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/379215.

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Una componente fondamentale della competenza sociale degli esseri umani è l'abilità di estrarre rapidamente e in modo spontaneo i segnali sociali che provengono dal volto, quali per esempio i tratti emotivi e di affidabilità. Il fatto che le risposte a queste configurazioni facciali siano rapide e automatiche suggerisce come esse derivino dalla pressione evolutiva a rilevare segnali di pericolo per aumentare le possibilità di sopravvivenza. Tuttavia, le origini ontogenetiche di queste abilità sociali sono ancora oggetto di dibattito. La presente tesi di dottorato si pone l'obiettivo di indaga

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2

McSorley, Eugene. "Spatiotemporal integration of spatial frequencies." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4615/.

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Spatial frequency processing delays suggest that their integration occurs from coarse to fine. However it may be the case that integration is flexible. The first aim of this thesis was to examine the integration of spatial frequencies and the second was to examine the delays involved in initial spatial frequency processing. A coarse to fine and a fine to coarse presentation order of filtered natural images were shown. The former is judged to be of a higher quality (experiment 1) but neither show any increase in incorrect detection reports of a fullbandwidth image (experiment 2, 3 and 4). When

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3

Costen, Nicholas Paul. "Spatial frequencies and face recognition." Thesis, University of Aberdeen, 1994. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU069146.

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If face images are degraded by spatial quantisation there is a non-linear acceleration of the decline of recognition accuracy as block-size increases, suggesting recognition requires a critical minimum range of object spatial frequencies. These may define the facial configuration, reflecting the structural properties allowing differentiation of faces. Experiment 1 measured speed and accuracy of recognition of six fronto-parallel faces shown with 11, 21 and 42 pixels/face, produced by quantisation, a Fourier low-pass filter and Gaussian blurring. Performance declined with image quality in a sig

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4

Jeantet, Coline. "Evaluation du traitement visuel précoce des visages chez les usagers de cannabis : étude par potentiels évoqués." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0329/document.

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Le cannabis est la drogue illégale la plus consommée actuellement en France. Le Δ9-tétrahydrocannabinol (Δ9-THC), en tant qu’excocannabinoïde, a un impact sur le système visuel via le système endocannabinoïde. Physiologiquement, parmi les deux voies majoritairement responsables de la transmission de l’information visuelle aux stades les plus précoces, la voie magnocellulaire pourrait être la plus sensible à l’effet du Δ9-THC. La perception des visages, stimuli complexes, nécessite le traitement précoce d’informations de bas niveaux : les fréquences spatiales. Or, les différentes gammes de fréq

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5

Wiles, Andrew Donald. "Modelling Framework for Radio Frequency Spatial Measurement." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/771.

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The main crux of this thesis was to produce a model that was capable of simulating the theoretical performance of different configurations for a spatial measurement system using radio frequency technology. It has been important to study new modalities of spatial measurement since spatial measurement systems are an enabling technology that have allowed for the creation of better medical procedures and techniques, provided valuable data for motion capture in animation and biomechanics, and have improved the quality of manufacturing processes in many industries. However, there has been room f

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Mudassar, Asloob Ahmad. "Active aperture synthesis using spatial frequency heterodyning." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/158.

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7

Elias, Bartholomew. "Cross-modal facilitation of spatial frequency discriminations through auditory frequency cue presentations." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/28611.

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8

Shrekenhamer, David. "Dynamic Control of Metamaterials at Terahertz Frequencies." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3152.

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Thesis advisor: Willie J. Padilla<br>Progress in the field of metamaterials has started coming to a point where the field may finally begin to emerge as a viable solution to many electromagnetic challenges facing the community. No where is that more true then at terahertz frequencies where there lies an immense opportunity for growth. The development of mature technologies within this region of the electromagnetic spectrum would provide a valuable resource to become available for a multitude of applications. In order to achieve this, the necessary first steps of identifying viable materials an

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9

Méred, Mohamed Chakib. "Théorie chromatique de l'effet Lau : Application au codage de fréquences spatiales et de densités en fausse couleur." Besançon, 1986. http://www.theses.fr/1986BESA2022.

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Role du codage en fausse couleur dans l'analyse visuelle de l'information. Tour d'horizon comparatif des différentes méthodes de codage optiques. Codage en fausse couleur base sur l'effet lau. Théorie chromatique de l'effet lau et sa génération

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10

Foster, Collin David. "Spatial parameter estimation using measured frequency response functions." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314556.

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11

Freeman, Tyler E. "Investigating the role of spatial frequency bands in drawing." Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/2291.

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12

Mungara, Ratheesh Kumar. "System-level performance of interference-aware spatial frequency reuse." Doctoral thesis, Universitat Pompeu Fabra, 2016. http://hdl.handle.net/10803/400869.

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Spatial frequency reuse is a long-established approach for enhancing the capacity of wireless systems through increased spectral efficiency (bits per second per unit bandwidth). The future 5th generation of wireless systems is expected to incorporate various forms of frequency reuse. This includes multiple-input multiple-output (MIMO) communication enabling frequency reuse across antennas, device-to-device (D2D)-based densification allowing spectrum reuse across direct communication links, and full duplexing utilizing the same spectrum for communication in the transmit and receive directions.

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13

Friedrich, J. O. "Frequency and spatial selectivity in nuclear magnetic resonance spectroscopy." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234964.

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14

Cleary, Robert. "Spatial frequency selective processes in short range motion perception." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237562.

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15

Zheng, Xiao. "Mid-spatial frequency control for automated functional surface processing." Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34723/.

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Functional surfaces interact with surrounding substances, such as another solid, a liquid, gas, acoustic or electromagnetic waves etc., in order to achieve a required effect. Surfaces are increasingly required with complex forms and ever-increasing precision, can be very challenging to make. In particular, mid-spatial frequency (MSF) ripples are difficult to avoid for various reasons, but especially the changing misfit between a polishing tool as it moves across a complex workpiece surface. Current surface processing techniques are limited in their ability effectively to control or remove MSF

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Payne, Joseph Allen. "Spatial structure of very low frequency modulated ionospheric currents /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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17

Ajayi, Idowu Iseoluwa. "Enhanced Physical Layer Security through Frequency and Spatial Diversity." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS227.

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La sécurité de la couche physique (PLS) est un paradigme émergent qui se concentre sur l'utilisation des propriétés de la communication sans fil, telles que le bruit, l'évanouissement, la dispersion, l'interférence, la diversité, etc. pour assurer la sécurité entre les utilisateurs légitimes en présence d'un espion. Comme le PLS utilise des techniques de traitement du signal et de codage, il intervient au niveau de la couche physique et peut donc garantir le secret quelle que soit la puissance de calcul de l'espion. Cela en fait une approche intéressante pour compléter la cryptographie traditi

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18

Lingner, Andrea. "The Processing of Low-Frequency Spatial Cues – A Behavioral Approach." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-123605.

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Collin, Charles Alain. "Effects of spatial frequency overlap on face and object recognition." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36896.

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There has recently been much interest in how limitations in spatial frequency range affect face and object perception. This work has mainly focussed on determining which bands of frequencies are most useful for visual recognition. However, a fundamental question not yet addressed is how spatial frequency overlap (i.e., the range of spatial frequencies shared by two images) affects complex image recognition. Aside from the basic theoretical interest this question holds, it also bears on research about effects of display format (e.g., line-drawings, Mooney faces, etc.) and studies examining the

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Barr, J. M. "A study of visual detection latency using spatial frequency stimuli." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376874.

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Taylor, Neil Thomas. "A study of spatial and frequency compounding in sonar imaging." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/288.

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Wang, Shan. "Recognition of facial expressions of pain using spatial frequency information." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715254.

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Individuals’ pain experiences can be communicated both verbally and non-verbally. Facial expressions are a primary non-verbal channel of pain communication, and so need to be clearly and unambiguously recognised and differentiated from other non-noxious emotional expressions. It is known that we are able to identify others’ pain from their facial expressions in an accurate and efficient manner, even under challenging visual conditions. However, little is known about how facial expressions are processed by observers, and what information is actually used, to make the identification of pain poss

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Gray, Thomas S. M. (Thomas L. ). Massachusetts Institute of Technology. "Minimizing high spatial frequency residual in active space telescope mirrors." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45217.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2008.<br>Includes bibliographical references (p. 141-143).<br>The trend in future space telescopes is towards large apertures and lightweight, rib-stiffened, and actively controlled deformable mirrors. These mirror architectures permit the development of segmented and deployed primary mirrors that lead to tremendous advancement in space telescope performance. Rib-stiffened and discretely actuated deformable mirrors have been shown to effectively mitigate common low order disturbances, but they are inev

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Webb, Richard Davis 1957. "Spatial frequency based closed-loop control of sheet metal forming." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14827.

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Haines, Ross. "Simultaneous reconstruction of spatial frequency fields and field sample locations." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:aa35073d-003b-4939-bf0e-8348243871b7.

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Classically, spatial smoothing methods such as kriging estimate smooth interpolating fields for features measured at well-located points. In this thesis, we make a simultaneous reconstruction of interpolating spatial fields and measurement locations. We give models, and sample-based Bayesian inference, for estimating locations of dialect samples on a map of England. The method exploits dialect-based spellings to locate these samples. The data are feature vectors extracted from written dialect samples. Just a fraction of the feature vectors ('anchors') have an associated spatial location. When

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Poplawski, Jaroslaw. "Very low frequency - Magnetic spatial position detection range and map." Thesis, University of Ballarat, 2008. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/40771.

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Automated positioning systems designed to measure three-dimensional locations of objects are of paramount importance to flexible manufacturing applications. These systems should perform in an industrial environment, withstanding obstacles of solid objects and must be immune from external influences including changes in atmospheric conditions and surrounding noise. Automated positioning systems should also be free of mechanical contact and able to perform without having to establish a line-of-sight with the measured object. In this thesis, a novel design is proposed for the spatial measurement

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Poplawski, Jaroslaw. "Very low frequency - Magnetic spatial position detection range and map." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/15472.

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Automated positioning systems designed to measure three-dimensional locations of objects are of paramount importance to flexible manufacturing applications. These systems should perform in an industrial environment, withstanding obstacles of solid objects and must be immune from external influences including changes in atmospheric conditions and surrounding noise. Automated positioning systems should also be free of mechanical contact and able to perform without having to establish a line-of-sight with the measured object. In this thesis, a novel design is proposed for the spatial measurement

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Huang, Ben. "Removing Textured Artifacts from Digital Photos Using Spatial Frequency Filtering." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/148.

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An abstract of the thesis of Ben Huang for the Master of Science in Electric and Computer Science presented [August 12nd, 2010]. Title: Removing textured artifacts from digital photos by using spatial frequency filtering Virtually all image processing is now done with digital images. These images, captured with digital cameras, can be readily processed with various types of editing software to serve a multitude of personal and commercial purposes. But not all images are directly captured and even of those that are directly captured many are not of sufficiently high quality. Digital images are

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Kauffmann, Louise. "Mécanismes et bases cérébrales du traitement des fréquences spatiales lors de la catégorisation de scènes visuelles." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAS047/document.

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L'analyse visuelle de scènes débute par l'extraction en parallèle de l'information à différentes fréquences spatiales, en suivant un mode de traitement par défaut « coarse-to-fine ». L'analyse rapide de l'information grossière (« coarse ») en basses fréquences spatiales fournirait un aperçu global de la scène, qui serait ensuite affiné par l'analyse des détails de la scène (« fine ») en hautes fréquences spatiales. L'objectif de cette thèse a été de préciser les bases cérébrales du traitement des fréquences spatiales lors de la catégorisation de scènes. A travers deux études comportementales,

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Masud, Salwa Fatima. "The role of high-frequency envelope cues for spatial hearing in rooms." Thesis, Boston University, 2014. https://hdl.handle.net/2144/21215.

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Thesis (M.Sc.Eng.) PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>Perception of sound laterality (left-right angle) is mediated by both interaural time differences (ITD) and interaural level differences (ILD). Previous localization studies in anechoic settings consistently show that low-freq

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Munding-Minier, Dashiel. "La dynamique spatio-temporelle de la production des mots : études par magnétoencéphalographie." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM3061/document.

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Cette thèse porte sur l'utilisation de la magnétoencéphalographie (MEG) comme outil d'étude de la dynamique des réponses corticales durant la production de mots. Les données empiriques accumulées dans la littérature sont évaluées au regard des modèles psycho- et neuro-linguistiques de la production des mots et du langage. Nous réalisons une exploration de l'évolution des modèles psycho-linguistiques et effectuons en ce sens une revue de la littérature MEG. Les forces et limites de la technique et des données empiriques existantes sont considérées et utilisées pour établir un protocole de dénom

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Cepeda, Miguel D. "Effects of spatial separation on across-frequency grouping in narrowband speech." Thesis, Boston University, 2013. https://hdl.handle.net/2144/12067.

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Thesis (M.S.)--Boston University<br>Understanding how we perceive speech in the face of competing sound sources coming from a variety of directions is an important goal in psychoacoustics. In everyday situations, noisy interference can obscure the content of a conversation and require listeners to integrate speech information across different frequency regions. Two studies will be explained that investigate the effects of spatial separation on the grouping of two spectrally separated, narrow bands of target speech with a variety of filler stimuli centered in between these bands. Target sentenc

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Callegary, James Briggs. "Spatial sensitivity of low-induction-number frequency-domain electromagnetic-induction instruments." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/282901.

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Numerical simulations were used to study spatial averaging in low-induction-number frequency-domain electromagnetic induction (LIN FEM) instruments. Local ( LS) and cumulative (CS) sensitivity were used to analyze three different aspects of LIN FEM spatial sensitivity. LS is the variation in a measured property given a small change at a given location of the property of interest. CS contours are derived from LS and reveal the shape and the fraction of total instrument sensitivity enclosed within the contours. The first study re-evaluated the asymptotic approach to LIN FEM spatial sensitivity.

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Senesi, Matteo. "Frequency steerable acoustic transducers." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44819.

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Structural health monitoring (SHM) is an active research area devoted to the assessment of the structural integrity of critical components of aerospace, civil and mechanical systems. Guided wave methods have been proposed for SHM of plate-like structures using permanently attached piezoelectric transducers, which generate and sense waves to evaluate the presence of damage. Effective interrogation of structural health is often facilitated by sensors and actuators with the ability to perform directional scanning. In this research, the novel class of Frequency Steerable Acoustic Transducers (FSAT

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Kim, Youngtae. "Spatial resolution limits for the reconstruction of acoustic source distribution by inverse techniques." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274706.

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Kramer, Michael L. "Collinearity and Surround Size Effects on Spatial Discrimination Tasks." Miami University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=miami1154716341.

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Gu, Xun. "Measuring Ultracomplex Supercontinuum Pulses and Spatio-Temporal Distortions." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5082.

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This thesis contains two components of research: studies of supercontinuum pulses generated in the novel microstructure fiber, and research on spatio-temporal coupling in ultrafast laser beams. One of the most exciting developments in optics in recent years has been the invention of the microstructure optical fiber. By controlling the structural parameters of these novel fibers in design and manufacturing, their dispersion profile can be freely tailored, opening up a huge application base. One particularly interesting effect in the microstructure fiber is the generation of ultrabroadband sup

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Ayalew, Tibebu Bekele. "Physical basis of the power-law spatial scaling structure of peak discharges." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1537.

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Key theoretical and empirical results from the past two decades have established that peak discharges exhibit power-law, or scaling, relation with drainage area across multiple scales of time and space. This relationship takes the form Q(A)= $#945;AΘ where Q is peak discharge, A is the drainage area, Θ is the flood scaling exponent, and α is the intercept. Motivated by seminal empirical studies that show that the flood scaling parameters α and Θ change from one rainfall-runoff event to another, this dissertation explores how certain rainfall and catchment physical properties control the flood

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Kim, Yong Sang. "Effects of luminance, color, and spatial frequency variations on perceived image quality." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40190.

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The primary objective of this dissertation was to investigate the effects of varying levels of luminance, color, and spatial frequency content on the perceived image quality of a soft-copy color image. A secondary objective was to test the robustness of selected image quality metrics (MTFA, SQRI, and ICS) to the color variations as measured by the change in correlations between the perceived quality ratings and the values of the image quality metrics. To accomplish these objectives, a color image was selected and its luminance, color, and spatial frequency components were attenuated systematic

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McCormick, Jackson C. "Spatial and temporal ionospheric monitoring using broadband sferic measurements." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54469.

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The objective of this thesis is to use radio emissions from lightning, known as `radio atmospherics' or `sferics', to study the temporal and spatial variation of the lower ionosphere, a layer of ionized atmosphere beginning at $\sim$70 km altitude (D-region). Very Low Frequency (VLF, 3$-$30kHz) radio waves are a useful diagnostic for lower ionospheric monitoring due to their reflection from this region and global propagation. Traditionally, the lower ionosphere has been sensed using single-frequency VLF transmitters allowing for analysis of a single propagation path, as there are only a small

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Palmer, Chris M. "Topographic and laminar models for the development and organisation of spatial frequency and orientation in V1." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/4114.

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Over the past several decades, experimental studies of the organisation of spatial frequency (SF) preference in mammalian visual cortex (V1) have reported a wide variety of conflicting results. A consensus now appears to be emerging that in the superficial layers SF is mapped continuously across the cortical surface. However, other evidence suggests that SF may differ systematically with cortical depth, at least in layer 4, where the magnocellular (M) and parvocellular (P) pathway afferents terminate in different sublaminae. It is not yet clear whether the topographic organisation for SF obser

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Shorrock, Heather. "Optical, neural and perceptual basis of blur sensitivity and the effect of text detail in myopes and emmetropes." Thesis, Anglia Ruskin University, 2013. http://arro.anglia.ac.uk/305407/.

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Retinal blur experienced by myopes during near work has been linked to myopia development and progression. Whether poor responses to blur signals are due to poor perceptual blur sensitivity (subjective depth of focus), poor neural accommodation responses (objective depth of focus) to blur or optical differences such as higher order aberrations making blur detection difficult is yet unclear. This study investigates whether myopes respond to blur differently compared to emmetropes and whether filtering spatial frequencies in reading text influence accommodation responses. Accommodative functions

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Shorrock, Heather. "Optical, neural and perceptual basis of blur sensitivity and the effect of text detail in myopes and emmetropes." Thesis, Anglia Ruskin University, 2013. https://arro.anglia.ac.uk/id/eprint/305407/1/Heather%20Shorrock%20-%20PhD%20Thesis.pdf.

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Retinal blur experienced by myopes during near work has been linked to myopia development and progression. Whether poor responses to blur signals are due to poor perceptual blur sensitivity (subjective depth of focus), poor neural accommodation responses (objective depth of focus) to blur or optical differences such as higher order aberrations making blur detection difficult is yet unclear. This study investigates whether myopes respond to blur differently compared to emmetropes and whether filtering spatial frequencies in reading text influence accommodation responses. Accommodative function

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Persanyi, Mary Wylie. "Individual differences in spatial frequency-dependent visible persistence: The role of temporal summation." Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1057952547.

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Herold, F. W., and J. A. Kaiser. "ELIMINATION OF SIDELOBE RESPONSE." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607377.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>Conventional phased arrays nominally sum the signals received by the elements prior to detection. By multiplying rather than summing signals received from pairs of elements, i.e., interferometer pairs, a set of Spatial Frequencies (SFs) is obtained. Obtaining the SFs requires employment of a multiple local oscillator technique. When summed, these spatial frequencies produce a single lobed (voltage) radiation pattern which, when passed through

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Lee, Stan S. "Disparity contingent high spatial frequency constraints on the upper velocity limit of stereopsis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ60961.pdf.

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Kuo, Yun-Ching. "Determination of image quality for added noise as a function of spatial frequency /." Online version of thesis, 1989. http://hdl.handle.net/1850/11527.

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Carvajal, Alexander. "Temporal and spatial dependency of high frequency wave collisions in rat somatosensory cortex." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Summer2008/A_Carvajal_062208.pdf.

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Lalonde, Jasmin. "Task-dependent transfer of perceptual to memory representations during delayed spatial frequency discrimination." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33911.

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Discrimination thresholds were obtained during a delayed spatial frequency discrimination task. In Experiment 1, we found that presentation of a mask 3 s before onset of a reference Gabor patch caused selective interference in a subsequent discrimination task. However, a 10 s interval abolished this masking effect. In Experiment 2, the mask was associated with a second spatial frequency discrimination task so that a representation of the mask had to be coded into short-term perceptual memory. The presence of this second discrimination task now caused similar interference effects on the primary

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Adams, Agur S. "Source localization in a cognitive radio environment consisting of frequency and spatial mobility." Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10719.

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Abstract:

Cognitive radio presents a unique challenge to source localization in that the radio has the ability to adapt to the environment, thus rendering current localization techniques ineffective due to a shifting combination of spatial, frequency, and temporal parameters. For any localization scheme to be effective, it must be able to adapt over time as a cognitive radio adapts to its surroundings. In this thesis an extended semi range-based localization scheme is proposed to accomplish this task. The proposed scheme estimates the position of a cognitive radio using the collaborative spectrum s

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