Tesi sul tema "Biot Theory"
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Shen, Jonah Wai. "Finite difference methods applied to biot theory in porous medium". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA306214.
Testo completoThesis advisor(s):, Clyde Scandrett,Anthony A. Atchley. "September 1995." Bibliography: p. 43. Also available online.
Lind, Nordgren Eleonora. "A study of tailoring acoustic porous material properties when designing lightweight multilayered vehicle panels". Doctoral thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100701.
Testo completoQC 20120815
Nordgren, Eleonora. "A study of tailoring acoustic porous material properties when designing lightweight multilayered vehicle panels". Phd thesis, Conservatoire national des arts et metiers - CNAM, 2012. http://tel.archives-ouvertes.fr/tel-00780756.
Testo completoBoulos, Mario. "Déshydratation mécano-thermique d’un milieu poreux déformable : modélisation des transferts et développement d’outils de caractérisation adaptés". Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14074/document.
Testo completoThis thesis focuses on the characterization of strongly deformable porous media in order to model the transfer taking place during drying. The theory of consolidation of Biot reflects the hydro-mechanical coupling occurring during dehydration of a deformable porous medium. Cáceres developed a model based on this theory and on the classical Darcy’s law. It is suitable for large deformations of the solid skeleton and the stress tensor is decomposed according to the so-called Terzaghi’s principle. A simulation using this model requires the information in thermo-physical terms of characteristics. Two experimental setups were developed : one measuring the relaxation charge, the other called dynamic pressurization (DP). The first experiment allowed us to characterize the permeability, Poisson’s ratio and Young’s modulus as functions of water content of the gel. The second experiment showed the importance of taking into account the compressibility of the solid phase in the modeling of the drying of agar gel as well as the effect of the existence of bubbles on the bulk modulus of the water. The establishment of two models followed this experimental study. First, the DP is consistent with the hypothesis of small deformations, a numerical model based on Biot’s equations was carried out to validate the parameters measured and to correct the estimated value of the permeability. A second model reflects the thermo-hydro-mechanical coupling in the convective drying of highly deformable porous media such as agar gel and alumina. The latter is based on the Biot’s theory and on the thermodynamics study of Coussy. It uses the Euler’s method while staying adapted to large deformations
Barbagallo, Mathias. "Statistical energy analysis and variational principles for the prediction of sound transmission in multilayered structures". Doctoral thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118427.
Testo completoQC 20130218
Barrière, Julien. "Atténuation et dispersion des ondes P en milieu poreux partiellement saturé : approche expérimentale". Phd thesis, Université de Pau et des Pays de l'Adour, 2011. http://tel.archives-ouvertes.fr/tel-00734463.
Testo completoLei, Lei. "Étude des matériaux poreux thermo compressés pour la modélisation des écrans acoustiques automobiles". Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2428/document.
Testo completoThis work was carried out in the framework of the project EcOBEx, whose main objective was to reduce the passby noise by mean of acoustic shields in the engine compartment of the vehicle. The acoustic shields are manufactured by thermocompression of uniform porous materials. The material’s properties and thickness evolve according to the degree of compression experienced by the material. The objective of this work is to propose some laws to predict the evolution of the materials properties from their initial non compressed values and the compression rate. Firstly, we focus on the parameters of the Johnson-Champoux-Allard-Lafarge (JCAL) equivalent fluid model : porosity, air-flow resistivity, tortuosity, viscous characteristic lengths, thermal characteristic length, static thermal permeability. Some analytical expressions are proposed to predict the variation of these parameters as a function of compression. They are derived from a physical model of cylindrical fibres where the fibre orientation variations induced by the thermocompression can be taken into account. The results are in good agreement with the measurements made two types of materials (open cell foam and fibrous). A generalized empirical model is finally proposed for the air-flow resistivity.In a second part, we focus on the elastic parameters, which are necessary to take into account the vibration of the skeleton. The quasi-static experimental method is first applied to study the evolution of the Young’s modulus along the compression rate for fibrous and open cell foams. A power law is then proposed to predict these variations. Finally, an inverse method for estimating the elastic properties of an orthotropic poro-elastic material from a vibratory measurement of a thermocompressed three layer sandwich structure is proposed. This method allows us to characterize the elastic properties of a porous material in a situation close to its actual application
Aichele, Johannes. "Elastic waves in complex conditions : from the onset of rupture to viscous dispersion in foams". Electronic Thesis or Diss., Lyon, 2019. http://www.theses.fr/2019LYSE1217.
Testo completoThis thesis is part of the research at Labtau (Laboratory of therapeutic applications of ultrasound) and ISTerre (Institut des sciences de la terre - earth science institute) at the interface of medical imaging and seismology, two research disciplines that are based on the propagation of elastic waves. It investigates the nature of elastic wave propagation in complex conditions by ultrafast ultrasound imaging, also known as transient elastography or shear wave imaging. This medical imaging technique allows for retrieval of the dynamic shear wave field inside a soft elastic material and is commonly applied in hospitals for elasticity mapping in, e.g., the liver and breast. In the present manuscript, two research questions of interest for bio- and geophysics are tackled. The first part treats elastic wave propagation in porous materials. The dispersion of the shear and secondary compression wave in lung-mimicking materials is analyzed experimentally and compared to Biot's theory of poro-elasticity. The results show a good agreement for the shear wave and qualitative agreement for the secondary compression wave. This has direct implications for elasticity imaging: the properties of the viscous fluid govern the shear wave dispersion in highly porous soft elastic materials. The thesis thus contributes to the emerging branch of lung elasticity imaging. The results could have clinical implications for other organs as well. The liver and spleen contain a high percentage of blood, a non-Newtonian fluid which exposes a highly varying viscosity. The conclusions drawn from the comparison of the experimental results and poro-elastic theory imply, that the role of the pore-filling fluid should be investigated in liver elastography: The clinically observed dispersion of shear waves in the liver remains partly unexplained by purely visco-elastic models. Furthermore, the experimental proof of the secondary compression wave is of general interest for poroelasticity. Originally, this wave has been the object of geophysical studies and has scarcely been shown experimentally. In the second part, the ultrafast ultrasound shear wave imaging technique is applied to a geophysical research question. What does the elastic wavefield, which is emitted by a frictional instability, reveal about the nature of dynamic rupture propagation? How does rupture, the process behind earthquakes, nucleate? By mapping the shear wave-field during rupture of a granular asperity at the source point and in the medium, unique insights into rupture nucleation are gained. The experimental setup, which relies on soft elastic phantoms, is shown to reproduce many characteristics of sliding friction that have been show for real rocks in the earth and the laboratory. These include supershear and sub-Rayleigh rupture propagation, a nucleation phase and stick-slip friction. Neither a singular-force nor a double-couple source mechanism explain the entirety of observed rupture modes. Finally, in order to statistically analyze the complex spatio-temporal evolution of the presented experiment, a semi-automated data analysis workflow, taking advantage of image segmentation and computer vision, is suggested
Shabani, Behnam. "Wave-Associated Seabed Behaviour near Submarine Buried Pipelines". Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3532.
Testo completoShabani, Behnam. "Wave-Associated Seabed Behaviour near Submarine Buried Pipelines". University of Sydney, 2008. http://hdl.handle.net/2123/3532.
Testo completoSoil surrounding a submarine buried pipeline consolidates as ocean waves propagate over the seabed surface. Conventional models for the analysis of soil behaviour near the pipeline assume a two-dimensional interaction problem between waves, the seabed soil, and the structure. In other words, it is often considered that water waves travel normal to the orientation of pipeline. However, the real ocean environment is three-dimensional and waves approach the structure from various directions. It is therefore the key objective of the present research to study the seabed behaviour in the vicinity of marine pipelines from a three-dimensional point of view. A three-dimensional numerical model is developed based on the Finite Element Method to analyse the so-called momentary behaviour of soil under the wave loading. In this model, the pipeline is assumed to be rigid and anchored within a rigid impervious trench. A non-slip condition is considered to exist between the pipe and the surrounding soil. Quasi-static soil consolidation equations are then solved with the aid of the proposed FE model. In this analysis, the seabed behaviour is assumed to be linear elastic with the soil strains remaining small. The influence of wave obliquity on seabed responses, i.e. the pore pressure and soil stresses, are then studied. It is revealed that three-dimensional characteristics systematically affect the distribution of soil response around the circumference of the underwater pipeline. Numerical results suggest that the effect of wave obliquity on soil responses can be explained through the following two mechanisms: (i) geometry-based three-dimensional influences, and (ii) the formation of inversion nodes. Further, a parametric study is carried out to investigate the influence of soil, wave and pipeline properties on wave-associated pore pressure as well as principal effective and shear stresses within the porous bed, with the aid of proposed three-dimensional model. There is strong evidence in the literature that the failure of marine pipelines often stems from the instability of seabed soil close to this structure, rather than from construction deficiencies. The wave-induced seabed instability is either associated with the soil shear failure or the seabed liquefaction. Therefore, the developed three-dimensional FE model is used in this thesis to further investigate the instability of seabed soil in the presence of a pipeline. The widely-accepted criterion, which links the soil liquefaction to the wave-induced excess pressure is used herein to justify the seabed liquefaction. It should be pointed out that although the present analysis is only concerned with the momentary liquefaction of seabed soil, this study forms the basis for the three-dimensional analysis of liquefaction due to the residual mechanisms. The latter can be an important subject for future investigations. At the same time, a new concept is developed in this thesis to apply the dynamic component of soil stress angle to address the phenomenon of wave-associated soil shear failure. At this point, the influence of three-dimensionality on the potentials for seabed liquefaction and shear failure around the pipeline is investigated. Numerical simulations reveal that the wave obliquity may not notably affect the risk of liquefaction near the underwater pipeline. But, it significantly influences the potential for soil shear failure. Finally, the thesis proceeds to a parametric study on effects of wave, soil and pipeline characteristics on excess pore pressure and stress angle in the vicinity of the structure.
Matta, Sandrine. "Propagation des ondes acoustiques dans une multicouche composée de couches viscoélastiques liquides, solides et poreuses". Thesis, Valenciennes, 2018. http://www.theses.fr/2018VALE0035/document.
Testo completoThis thesis proposes a general formalism to model the acoustic wave propagation in a multilayer consisting of any combination of fluid, isotropic elastic solid, and isotropic poroelastic layers, the method having the flexibility to be extended to include other layer-natures. At a first stage, a stable algorithm is developed, based on the recursive stiffness matrix approach, to model the propagation of a plane wave incident on the multilayer as a function of its incidence angle and frequency. This algorithm merges recursively the structureindividual layers stiffness matrices into one total stiffness matrix and allows then the calculation of the reflection and transmission coefficients, as well as the displacement and stress components inside the multilayer for every incident plane wave direction. Secondly, to model the propagation of a bounded incident wave beam, the angular spectrum technique is used which is based on the decomposition of this beam into a spectrum of plane waves traveling in different directions. The corresponding reflected wave beam in the incidence medium, and the transmitted wave beam in the transmission medium, as well as the fields distributions (displacement and stress components) inside the multilayer are obtained by summing the contribution of all the plane waves traveling in different directions. As a numerical application, a three-layered solid-porous-solid structure immersed in water is simulated. The resulting reflection and transmission as well as the displacement and stress components in the multilayer corresponding to both, the incident plane wave in different directions and the incident bounded beam reveal the stability of the method and the continuity of the displacements and stresses at the interfaces
Zhao, Jieyu. "Stochastic bit stream neural networks : theory, simulations and applications". Thesis, Royal Holloway, University of London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338916.
Testo completoMasmoudi, Khaled. "Schémas de codage bio-inspirés". Phd thesis, Université de Nice Sophia-Antipolis, 2012. http://tel.archives-ouvertes.fr/tel-00850287.
Testo completoAlexopoulos, Kyriakos. "Phase spectral representation for low bit rate speech coding". Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249314.
Testo completoEaston, Mark. "Fast algorithms for low bit rate digital speech coding". Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240500.
Testo completoKweh, Teck Hock. "Improved quality block-based low bit rate video coding". Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/844563/.
Testo completoLaurenson, Lawrie Jon Bain. "Colonisation theory and invasive biota : the Great Fish river, a case history". Thesis, Rhodes University, 1986. http://hdl.handle.net/10962/d1005905.
Testo completoGouvianakis, Nikolaos. "Speech coding at medium bit rates using analysis by synthesis techniques". Thesis, Loughborough University, 1989. https://dspace.lboro.ac.uk/2134/27741.
Testo completoYeldener, Suat. "Sinusoidal model based low bit rate speech coding for communication systems". Thesis, University of Surrey, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359842.
Testo completoAtungsiri, Samuel Asangbeng. "Joint source and channel coding for low bit rate speech communication systems". Thesis, University of Surrey, 1991. http://epubs.surrey.ac.uk/989/.
Testo completoXu, Chunmei. "Sparsity optimization and RRSP-based theory far l-bit compressive sensing". Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6443/.
Testo completoRice, Malachy. "Analysis and simulation of high bit-rate digital transmission over wire-pair channels". Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361303.
Testo completoChan, C. F. "Low bit-rate speech coding : A parallel processing approach using digital signal processors". Thesis, University of Essex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375652.
Testo completoREBILLARD, PASCAL. "Prediction de l'impedance de surface des materiaux poreux stratifies par la theorie de biot". Le Mans, 1991. http://www.theses.fr/1991LEMA1006.
Testo completoChilton, Edward. "Factors affecting the quality of linear predictive coding of speech at low bit-rates". Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/843568/.
Testo completoLavayen, Farfán Daniel. "Non-linear beam theory in context of bio-inspired sensing of flows". Master's thesis, Pontificia Universidad Católica del Perú, 2016. http://tesis.pucp.edu.pe/repositorio/handle/123456789/8324.
Testo completoTesis
Kritzinger, Carl. "Low bit rate speech coding". Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2078.
Testo completoDespite enormous advances in digital communication, the voice is still the primary tool with which people exchange ideas. However, uncompressed digital speech tends to require prohibitively high data rates (upward of 64kbps), making it impractical for many applications. Speech coding is the process of reducing the data rate of digital voice to manageable levels. Parametric speech coders or vocoders utilise a-priori information about the mechanism by which speech is produced in order to achieve extremely efficient compression of speech signals (as low as 1 kbps). The greater part of this thesis comprises an investigation into parametric speech coding. This consisted of a review of the mathematical and heuristic tools used in parametric speech coding, as well as the implementation of an accepted standard algorithm for parametric voice coding. In order to examine avenues of improvement for the existing vocoders, we examined some of the mathematical structure underlying parametric speech coding. Following on from this, we developed a novel approach to parametric speech coding which obtained promising results under both objective and subjective evaluation. An additional contribution by this thesis was the comparative subjective evaluation of the effect of parametric speech coding on English and Xhosa speech. We investigated the performance of two different encoding algorithms on the two languages.
Chen, Wei 1976. "Perceptual postfiltering for low bit rate speech coders". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112563.
Testo completoThis thesis introduces a novel perceptual postfiltering system for low bit rate speech coders. The proposed postfilter works at the decoder, as is the case for the conventional adaptive postfilter. Specific human auditory properties are considered in the postfilter design to improve speech quality. A Gaussian Mixture Model based Minimum Mean Squared Error estimation of the perceptual postfilter is performed with the received information at the decoder. Perceptual postfiltering is then applied to the reconstructed speech to improve speech quality. Test results show that the proposed system gives better perceptual speech quality over conventional adaptive postfiltering.
Furbeck, David S. "Fast determination of bit error rates on impulsive noise channels". Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15656.
Testo completoWoynarski, Lisa Christine. "Towards an ecological performance aesthetic for the bio-urban : a non-anthropocentric theory". Thesis, Royal Central School of Speech & Drama, 2015. http://crco.cssd.ac.uk/551/.
Testo completoHurley, M. T. "The application of Biot's theory to sea-bed sediments". Thesis, Bangor University, 1989. https://research.bangor.ac.uk/portal/en/theses/the-application-of-biots-theory-to-seabed-sediments(db8adbfb-ed81-4cc9-a064-87a8da3bf815).html.
Testo completoKim, Choon S. "Low bit-rate subband coding of image and video signals using vector quantization". Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/15889.
Testo completoChu, Chung Cheung. "Tree encoding of speech signals at low bit rates". Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65459.
Testo completoHuang, Yuheng. "Bit-interleaved coded modulation with iterative decoding for wireless communications /". Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5903.
Testo completoKim, Hyun Soo Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "Speech analysis techniques useful for low or variable bit rate coding". Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2005. http://handle.unsw.edu.au/1959.4/22050.
Testo completoSipitca, Mihai. "A conditional entropy approach to encoding DCT coefficients for low bit rate video compression". Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13404.
Testo completoLee, Im Soo. "Computational Techniques for Efficient Solution of Discretized Biot's Theory for Fluid Flow in Deformable Porous Media". Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28179.
Testo completoPh. D.
DE, POLLIER CLAUDE. "Theorie de biot et prediction des proprietes acoustiques des materiaux poreux : propagation dans les milieux acoustiques desordonnes". Le Mans, 1989. http://www.theses.fr/1989LEMA1001.
Testo completoSarkar, Mitradeep. "Hybrid surface plasmon modes in metallic nanostructures : Theory, numerical analysis and application to bio-sensing". Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS251/document.
Testo completoThe surface plasmons on metallic surfaces are excited by the collective oscillations of free electrons. They satisfy certain resonance conditions and their dispersion can be considered as modes of the system. The plasmons at uniform metal-dielectric interfaces manifest as evanescent electromagnetic (EM) fields confined to a few hundreds of nanometers from the metallic surface and propagate along the interface. This mode is called the Propagating surface plasmon (PSP) and is a fundamental plasmonic mode. The other fundamental modes, which are non-propagative, results from collective oscillations of free electrons on curved surfaces of metallic nano-particles. They are called localized surface plasmon (LSP) modes. We have shown that the polarizability of complex geometries with an underlying substrate can be calculated analytically and the results obtained closely approximate the resonance conditions for such geometries.In this work, various other plasmonic modes originating from the two fundamental modes were studied in details and described by their corresponding analytical formulation. In a binary metallic arrays on glass substrate, plasmonic modes are excited by diffraction orders, called the Wood-Rayleigh modes (WRM). In metallic strips the PSP is confined by the finite edges of the strips and propagate along the length of the strips, called the confined propagating plasmons (CPP).For arrays of metallic nano-particles on a metallic film, the Bragg modes (BM) are excited by diffraction of the PSP. In such structures the LSP of the nano-particles and the PSP of the film can undergo a harmonic coupling to give rise to the hybrid lattice plasmon (HLP). The characteristics of the HLP mode for an array of metallic nano-cylinders on a metallic film is presented in details.The effect of the surrounding medium on the plasmonic modes is used in surface plasmon resonance (SPR) detectors which probe the shift in resonance condition of the modes. Such shift is dependent on the intrinsic dispersion of the modes. The aim of this work is to optimize the SPR detectors for affinity biosensing where probe and analyte molecules are bound to the metallic surface. We have shown that by selective functionalization of the metallic biochip surface, an enhancement of the performance of such detection can be achieved in terms of the amount of analyte used. Also the near field enhancement plays a major role in surface enhanced Raman scattering (SERS). We have shown that the presence of certain modes in the system can enhance the recorded SERS intensity.Rigorous numerical methods, adapted to the particular geometry under study, were developed to compute the near and far field characteristics of different structures. The experimental excitation of the modes and their application in SPR detection was demonstrated using a setup based on a spectral scanning modality operating in the Kretschmann configuration. The various structures were fabricated on a biochip using e-beam lithography at IEF, University Paris Sud and the reflectivity dispersion from the biochip was recorded. Such experimental results were shown to be in close agreement with the theoretical results. SERS experiments were carried out in collaboration with CSPBAT at University Paris 13 and the results were seen to fit closely the theoretically predicted trends.Such detailed description of plasmonic modes can offer a complete understanding of the surface plasmon resonance phenomenon in metallic structures and be optimized as per required for various applications. The theories presented in this work can be used to effectively describe the EM properties of different geometries and experimental configurations. From a comprehensive representation of plasmonic modes, different aspects of the photon-plasmon interactions can thus be elucidated
McCorkle, Warren Benson Jr. "Tongue, nib, block, bit: rhetorical delivery and technologies of writing". The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1125329989.
Testo completoAbdullah, S. N. "Data transmission at 9600 bit/sec over an HF radio link". Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/7432.
Testo completoSimard, Jean-Raymond. "Classical and quantum strategies for bit commitment schemes in the two-prover model". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101174.
Testo completoPujaico, Rivera Fernando 1982. "Algoritmos bit-flipping para decodificação conjunta de fontes correlacionadas em canais ruidosos". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260833.
Testo completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-25T19:09:11Z (GMT). No. of bitstreams: 1 PujaicoRivera_Fernando_D.pdf: 1689945 bytes, checksum: b226b1d9cf87f31fc3d470ac895b0e33 (MD5) Previous issue date: 2014
Resumo: Esta tese propõe um sistema de transmissão de informação de várias fontes correlacionadas sobre canais ruidosos. Inicialmente se aborda o problema da codificação fonte-canal conjunta. Para este problema se definirá conceitos de taxas ótimas e se apresentará a maneira de obtê-las. Posteriormente, será proposto um algoritmo de decodificação conjunta com complexidade tratável. Diversos resultados de desempenho do algoritmo proposto serão apresentados. Estes resultados mostram um bom compromisso entre desempenho e complexidade quando comparados com a decodificação independente. Finalmente, o algoritmo de decodificação conjunta seguido de uma proposta de regra de fusão é usado no problema CEO e o desempenho deste novo algoritmo é apresentado
Abstract: This thesis proposes a system that transmits information from various correlated sources over noisy channels. Initially, it addresses the problem of joint source-channel coding. To solve this problem, concepts of optimal rates will be defined and the way to obtain them will be presented. Subsequently, a joint decoding algorithm with a tractable complexity is proposed. Several performance results of the proposed algorithm will be presented. These results show a good compromise between performance and complexity when compared to the non-joint decoding. Finally, the joint decoding algorithm, followed by a proposal for a fusion rule is used in the CEO problem and the performance of this new algorithm is presented
Doutorado
Telecomunicações e Telemática
Doutor em Engenharia Elétrica
Xiao, Hong. "Joint source-channel coding for noisy channels and its applications for low-bit-rate multimedia transmission". Thesis, The University of Sydney, 2001. https://hdl.handle.net/2123/27824.
Testo completoDavis, Thomas A. "The evolution of literary theory towards a bio-cultural approach to literature through Jane Austen's Northanger Abbey /". Diss., Click here for available full-text of this thesis, 2006. http://library.wichita.edu/digitallibrary/etd/2006/t075.pdf.
Testo completoDavis, Thomas Arthur. "The evolution of literary theory: towards a bio-cultural approach to literature through Jane Austen’s Northanger Abbey". Thesis, Wichita State University, 2006. http://hdl.handle.net/10057/390.
Testo completoThesis (M.A.)--Wichita State University, Dept. of English.
"May 2006."
Includes bibliographic references (leaves 36-39)
Freitas, Salgueiredo Camila. "Biomimicry and the low carbon vehicle : generation of innovative bio-inspired concepts using the C-K theory". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLE021/document.
Testo completoBiologically inspired design, also called bioinspired design, biomimetics or biomimicryproposes the use of Nature, or biological knowledge, as a source of inspiration to improve orconceive new designs. Integrating the biologically inspired design approach into theinnovation process of companies could then allow the generation of more innovative and sustainable concepts.This thesis, realized during three years at a French automaker (Renault) research and development department had two objectives: to understand the mechanisms of the biologically inspired design and to apply this approach to a case belonging to an innovation field of the automotive sector.In order to understand the mechanisms of biologically inspired design we studied theliterature about bio-inspired concepts and inventions.We have chosen a design theory, the C-K theory, to analyse the design process of these literature examples. This allowed us to propose a model for bio-inspiration.We applied this model inspired by the C-K theory to the low carbon vehicle innovation field.This field includes the development of innovations allowing passenger cars to reduce theirenvironmental footprint, mainly the reduction of carbon dioxide (CO2) emissions. Thecarbon dioxide is a greenhouse gas that contributes to the climate change phenomena. Theidentification of the path where concept partitioning is required in this field began with theconstruction of a concepts space, using knowledge of company experts on the subject.Reorganizing these concepts and building a knowledge base on the strategies for CO2 emissions allowed us to map this innovation field. The vehicles with more than oneenergy source, such as electrified internal combustion engine vehicles and hybrid vehicleswere the path chosen for the research of bio-inspired concepts.A research about energy in nature led us to identify the energy in animal cells, particularlythose in humans as an interesting biological knowledge base. Human energy properties suchas cells with more than one kind of energy storage, with at least two metabolic pathways torecharge these stores are interesting to revise the knowledge about energy store andconversion in multi-energy vehicles. Besides, the human sportive performance has appearedto be an interesting knowledge base, as the training techniques and the running techniquesduring a race can influence the way athletes use their energy.These two biological bases have led us to formulate a bio-inspired concept based on therunning patterns observed in runners during races superior to 1500~m. The speed profilesrecorded show a spontaneous speed variation chosen by the runner, in order to better use itslimited anaerobic energy stores. For a vehicle, this could mean that varying its speed couldallow a lower fuel consumption than using a constant speed. This bio-inspired concept wasexplored in this thesis with the realization of tests in a dedicated test track and simulations. These tests show the potential of this concept for conventional vehicles and its limitations.This work opens the way for analysing the vehicle energetics in the light of human energetics.The versatility of human activities could help on the development of vehicles adapting todifferent use cases. Further research could also use the knowledge about the dynamic modelling of energy in vehicles to complete the empirical approaches used to model the human energy management, allowing a betteroptimization of running strategies. The study of the bio-inspiration process using a designtheory also allowed a better comprehension of the reasons for using this approach and of theconditions for successfully applying it in the innovative process of a company
Docef, Alen. "Telemedicine applications of subband image coding at very low bit rates". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/14776.
Testo completoCai, Jianfei. "Robust error control and optimal bit allocation for image and video transmission over wireless channels /". free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3052158.
Testo completoLiu, Sam J. "Low bit-rate image and video compression using adaptive segmentation and quantization". Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/14850.
Testo completo