Дисертації з теми "Reconstruction approaches"
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Chen, Liyuan. "Variational approaches in image recovery and segmentation." HKBU Institutional Repository, 2015. https://repository.hkbu.edu.hk/etd_oa/227.
Повний текст джерелаKrolla, Bernd [Verfasser]. "Heterogeneous Reconstruction Approaches for Object and Scene Representation / Bernd Krolla." München : Verlag Dr. Hut, 2016. http://d-nb.info/1100967923/34.
Повний текст джерелаSantos, Botelho Oliveira Leite Ana Paula. "Integrative approaches for systematic reconstruction of regulatory circuits in mammals." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77783.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 141-149).
The reconstruction of regulatory networks is one of the most challenging tasks in systems biology. Although some models for inferring regulatory networks can make useful predictions about the wiring and mechanisms of molecular interactions, these approaches are still limited and there is a strong need to develop increasingly universal and accurate approaches for network reconstruction. This problem is particularly challenging in mammals, due to the higher complexity of mammalian regulatory networks and limitations in experimental manipulation. In this thesis, I present three systematic approachs to reconstruct, analyse and refine models of gene regulation. In Chapter 1, I devise a method for deriving an observational model from temporal genomic profiles. I use it to choose targets for perturbation experiments in order to determine a network controlling the responses of mouse primary dendritic cells to stimulation with pathogen components. In Chapter 2, I introduce the algorithm Exigo, for identifying essential interactions in regulatory networks reconstructed from experimental data where regulators have been silenced, using a network reduction strategy. Exigo outperforms previous approaches on simulated data, uncovers the core network structure when applied to real networks derived from perturbation studies in mammals, and improves the performance of network inference methods. Lastly, I introduce in Chapter 3 an approach to learn a module network from multiple highthroughput assays. Analysis of a diffuse large B-cell lymphoma dataset identifies candidate regulator genes, microRNAs and copy number aberrations with biological, and possibly therapeutic, importance.
by Ana Paula Santos Botelho Oliveira Leite.
Ph.D.
Urimi, Lakshmi P. "Image reconstruction techniques and measure of quality classical vs.modern approaches/." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2887.
Повний текст джерелаThesis research directed by: Applied Mathematics and Scientific Computation Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
khan, saad. "MULTI-VIEW APPROACHES TO TRACKING, 3D RECONSTRUCTION AND OBJECT CLASS DETECTION." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4066.
Повний текст джерелаPh.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Computer Science PhD
Fang, Yingying. "Investigations on models and algorithms in variational approaches for image restoration." HKBU Institutional Repository, 2020. https://repository.hkbu.edu.hk/etd_oa/804.
Повний текст джерелаBarnes, Karen 1977. "Through a gendered lens? : institutional approaches to gender mainstreaming in post-conflict reconstruction." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33870.
Повний текст джерелаSteel, Blair Andrew. "Molecular and palaeontological approaches to the reconstruction of neogene spinose planktic foraminiferal phylogeny." Thesis, Royal Holloway, University of London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429407.
Повний текст джерелаCoban, Sophia. "Practical approaches to reconstruction and analysis for 3D and dynamic 3D computed tomography." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/practical-approaches-to-reconstruction-and-analysis-for-3d-and-dynamic-3d-computed-tomography(f34a2617-09f9-4c4e-9669-f86f6cf2bce5).html.
Повний текст джерелаYang, G. "Numerical approaches for solving the combined reconstruction and registration of digital breast tomosynthesis." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1356652/.
Повний текст джерелаSmale, Kenneth. "Relating Subjective and Objective Knee Function After Anterior Cruciate Ligament Injury Through Biomechanical and Neuromusculoskeletal Modelling Approaches." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37947.
Повний текст джерелаAlkindy, Bassam. "Combining approaches for predicting genomic evolution." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2012/document.
Повний текст джерелаIn Bioinformatics, understanding how DNA molecules have evolved over time remains an open and complex problem.Algorithms have been proposed to solve this problem, but they are limited either to the evolution of a given character (forexample, a specific nucleotide), or conversely focus on large nuclear genomes (several billion base pairs ), the latter havingknown multiple recombination events - the problem is NP complete when you consider the set of all possible operationson these sequences, no solution exists at present. In this thesis, we tackle the problem of reconstruction of ancestral DNAsequences by focusing on the nucleotide chains of intermediate size, and have experienced relatively little recombinationover time: chloroplast genomes. We show that at this level the problem of the reconstruction of ancestors can be resolved,even when you consider the set of all complete chloroplast genomes currently available. We focus specifically on the orderand ancestral gene content, as well as the technical problems this raises reconstruction in the case of chloroplasts. Weshow how to obtain a prediction of the coding sequences of a quality such as to allow said reconstruction and how toobtain a phylogenetic tree in agreement with the largest number of genes, on which we can then support our back in time- the latter being finalized. These methods, combining the use of tools already available (the quality of which has beenassessed) in high performance computing, artificial intelligence and bio-statistics were applied to a collection of more than450 chloroplast genomes
Wang, Yongchang. "Novel Approaches in Structured Light Illumination." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/116.
Повний текст джерелаFarahibozorg, Seyedehrezvan. "Uncovering dynamic semantic networks in the brain using novel approaches for EEG/MEG connectome reconstruction." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/278024.
Повний текст джерелаIVAN, MIHAI. "RETHINKING THE AXIS: APPROACHES IN THE DEVELOPMENT OF COMMUNIST INITIATED/UNCOMPLETED ARCHITECTURE IN BUCHAREST AFTER 1989." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155584865.
Повний текст джерелаHasse, Christoph [Verfasser], Johannes [Akademischer Betreuer] Albrecht, and Kevin [Gutachter] Kröninger. "Alternative approaches in the event reconstruction of LHCb / Christoph Hasse ; Gutachter: Kevin Kröninger ; Betreuer: Johannes Albrecht." Dortmund : Universitätsbibliothek Dortmund, 2019. http://d-nb.info/1201885574/34.
Повний текст джерелаBelhi, Abdelhak. "Digital Cultural Heritage Preservation : enrichment and Reconstruction based on Hierarchical Multimodal CNNs and Image Inpainting Approaches." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSE2019.
Повний текст джерелаCultural heritage plays an important role in defining the identity of a society. Long-term physical preservation of cultural heritage remains risky and can lead to multiple problems related to destruction and accidental damage. Digital technologies such as photography and 3D scanning provided new alternatives for digital preservation. However, adapting them to the context of cultural heritage is a challenging task. In fact, fully digitizing cultural assets (visually and historically) is only easy when it comes to assets that are in a good physical shape and all their data is at possession (fully annotated). However, in the real-world, many assets suffer from physical degradation and information loss. Usually, to annotate and curate these assets, heritage institutions need the help of art specialists and historians. This process is tedious, involves considerable time and financial resources, and can often be inaccurate. Our work focuses on the cost-effective preservation of cultural heritage through advanced machine learning methods. The aim is to provide a technical framework for the enrichment phase of the cultural heritage digital preservation/curation process. Through this thesis, we propose new methods to improve the process of cultural heritage preservation. Our challenges are mainly related to the annotation and enrichment of cultural objects suffering from missing and incomplete data (annotations and visual data) which is often considered ineffective when performed manually. Thus, we propose approaches based on machine learning and deep learning to tackle these challenges. These approaches consist of the automatic completion of missing cultural data. We mainly focus on two types of missing data: textual data (metadata) and visual data.The first stage is mainly related to the annotation and labeling of cultural objects using deep learning. We have proposed approaches, that take advantage of cultural objects’ visual features as well as partially available textual annotations, to perform an effective classification. (i) the first approach is related to the Hierarchical Classification of Objects to better meet the metadata requirements of each cultural object type and increase the classification algorithm performance. (ii) the second proposed approach is dedicated to the Multimodal Classification of cultural objects where any object can be represented, during classification, with a subset of available metadata in addition to its visual capture. The second stage considers the lack of visual information when dealing with incomplete and damaged cultural objects. In this case, we proposed an approach based on deep learning through generative models and image data clustering to optimize the image completion process of damaged cultural heritage objects. For our experiments, we collected a large database of cultural objects. We chose to use fine-art paintings in our tests and validations as they were the best in terms of annotations quality
Chaari, Lotfi. "Parallel magnetic resonance imaging reconstruction problems using wavelet representations." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00587410.
Повний текст джерелаJack, Dominic. "Deep learning approaches for 3D inference from monocular vision." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/204267/1/Dominic_Jack_Thesis.pdf.
Повний текст джерелаTran, Dai viet. "Patch-based Bayesian approaches for image restoration." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCD049.
Повний текст джерелаIn this thesis, we investigate the patch-based image denoising and super-resolution under the Bayesian Maximum A Posteriori framework, with the help of a set of high quality images which are known as standard images. Our contributions are to address the construction of the dictionary, which is used to represent image patches, and the prior distribution in dictionary space. We have demonstrated that the careful selection of dictionary to represent the local information of image can improve the image reconstruction. By establishing an exhaustive dictionary from the standard images, our main attribute is to locally select a sub-dictionary of matched patches to recover each patch in the degraded image. Beside the conventional Euclidean measure, we propose an effective similarity metric based on the Earth Mover's Distance (EMD) for image patch-selection by considering each patch as a distribution of image intensities. Our EMD-based super-resolution algorithm has outperformed comparing to some state-of-the-art super-resolution methods.To enhance the quality of image denoising, we exploit the distribution of patches in the dictionary space as a an image prior to regularize the optimization problem. We develop a computationally efficient procedure, based on piece-wise constant function estimation, for low dimension dictionaries and then proposed a Gaussian Mixture Model (GMM) for higher complexity dictionary spaces. Finally, we justify the practical number of Gaussian components required for recovering patches. Our researches on multiple datasets with combination of different dictionaries and GMM models have complemented the lack of evidence of using GMM in the literature
Horesh, Lior. "Some novel approaches in modelling and image reconstruction for multi-frequency Electrical Impedance Tomography of the human brain." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1444744/.
Повний текст джерелаMorris, Jennifer Louise. "Integrated approaches to the reconstruction of early land vegetation and environments from lower Devonian Strata, Central-South Wales." Thesis, Cardiff University, 2009. http://orca.cf.ac.uk/15352/.
Повний текст джерелаNi, Fenbiao. "Analysis and reconstruction of the relationship between a circulation anomaly feature and tree rings: Linear and nonlinear approaches." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/284104.
Повний текст джерелаAckermann, Jens [Verfasser], Michael [Akademischer Betreuer] Goesele, and Reinhard [Akademischer Betreuer] Klein. "Photometric Reconstruction from Images: New Scenarios and Approaches for Uncontrolled Input Data / Jens Ackermann. Betreuer: Michael Goesele ; Reinhard Klein." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2014. http://d-nb.info/1110978979/34.
Повний текст джерелаYe, Hongwei. "Development and implementation of fully three-dimensional iterative reconstruction approaches in spect with parallel, fan- and cone-beam collimators." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.
Повний текст джерелаBaker, Jennifer. "From Comparative Genomics to Synthetic Biology| Using Ancestral Gene Reconstruction Approaches to Test Hypotheses Regarding Proximate Mechanisms in our Evolutionary History." Thesis, The George Washington University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3688029.
Повний текст джерелаAt its core human evolutionary biology seeks to answer the question of how the defining characteristics of modern humans evolved, such as large-brains, obligatory bipedal gait, extended juvenile period, and increased longevity. Traditional fossil-based research uses morphology to infer behavior and life history and only recently have researchers been able to make predictions regarding the effect of modifications to the DNA and proteins of our forbearers. Using these innovative methods we investigated the molecular evolution of a superfamily of transcription factors called the Nuclear Receptors. The patterns of sequence evolution observed in our bioinformatic analyses suggest a shift in the intensity of selection pressure occurred on NR2C1, a gene that plays a role early in embryonic stem cell proliferation and neuronal differentiation. Methods are now available to reconstruct ancestral DNA and its corresponding protein sequences and thus generate testable hypotheses about the functional evolution of genes on specific lineages. These methods allowed us to analyze how modifications to the modern human version of NR2C1 affected the ability of an embryonic stem cell to remain in its proliferative state. We began by creating three different copies of our gene of interest: the human copy, the chimpanzee copy, and the ancestral copy of NR2C1 for the inferred last common ancestor of chimpanzee and modern humans. Inserting these three different gene variants into mouse embryonic stem cells that have had NR2C1 knocked down allowed us to quantitatively analyze the transcriptional and regulatory functions of NR2C1.
Lopez, Radcenco Manuel. "Data-driven approaches for ocean remote sensing : from the non-negative decomposition of operators to the reconstruction of satellite-derived sea surface dynamics." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2018. http://www.theses.fr/2018IMTA0107/document.
Повний текст джерелаIn the last few decades, the ever-growing availability of multi-source ocean remote sensing data has been a key factor for improving our understanding of upper ocean dynamics. In this regard, developing efficient approaches to exploit these datasets is of major importance. Particularly, the decomposition of geophysical processes into relevant modes is a key issue for characterization, forecasting and reconstruction problems. Inspired by recent advances in blind source separation, we aim, in the first part of this thesis dissertation, at extending non-negative blind source separation models to the problem of the observation-based characterization and decomposition of linear operators or transfer functions between variables of interest. We develop mathematically sound and computationally efficient schemes. We illustrate the relevance of the proposed decomposition models in different applications involving the analysis and forecasting of geophysical dynamics. Subsequently, given that the ever-increasing availability of multi-source datasets supports the exploration of data-driven alternatives to classical model-driven formulations, we explore recently introduced data-driven models for the interpolation of geophysical fields from irregularly sampled satellite-derived observations. Importantly, with a view towards the future SWOT mission, the first satellite mission to produce complete two-dimensional wide-swath satellite altimetry observations, we focus on assessing the extent to which SWOT data may lead to an improved reconstruction of altimetry fields
Tulipani, Svenja. "Novel biomarker and stable isotopic approaches for palaeoenvironmental reconstruction of saline and stratified ecosystems : the modern Coorong Lagoon and Devonian reefs of the Canning Basin." Thesis, Curtin University, 2013. http://hdl.handle.net/20.500.11937/147.
Повний текст джерелаBaumann, Andrea Barbara. "Clash of organisational cultures? : a comparative analysis of American and British approaches to the coordination of defence, diplomacy and development in stability operations, 2001-2010." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:80c8f9c6-fb4f-4c03-9f8f-26d89fcb8339.
Повний текст джерелаFuchs, Mirco Verfasser], Jens [Akademischer Betreuer] [Haueisen, Thomas R. [Gutachter] Knösche, and Christoph [Gutachter] Braun. "The smoothness constraint in spatially informed minimum norm approaches for the reconstruction of neuroelectromagnetic sources / Mirco Fuchs ; Gutachter: Thomas R. Knösche, Christoph Braun ; Betreuer: Jens Haueisen." Ilmenau : TU Ilmenau, 2017. http://d-nb.info/1178141594/34.
Повний текст джерелаEickel, Klaus [Verfasser], Matthias [Akademischer Betreuer] Günther, Matthias [Gutachter] Günther, and Tony [Gutachter] Stöcker. "New Approaches to Simultaneous Multislice Magnetic Resonance Imaging : Sequence Optimization and Deep Learning based Image Reconstruction / Klaus Eickel ; Gutachter: Matthias Günther, Tony Stöcker ; Betreuer: Matthias Günther." Bremen : Staats- und Universitätsbibliothek Bremen, 2019. http://d-nb.info/1186248920/34.
Повний текст джерелаLutzweiler, Christian [Verfasser], Vasilis [Akademischer Betreuer] [Gutachter] Ntziachristos, Hans-Joachim [Gutachter] Bungartz, and Oliver [Gutachter] Hayden. "Towards Real-Time Clinical Imaging with Multi-Spectral Optoacoustic Tomography: Reconstruction Approaches and Initial Experimental Studies / Christian Lutzweiler ; Gutachter: Hans-Joachim Bungartz, Vasilis Ntziachristos, Oliver Hayden ; Betreuer: Vasilis Ntziachristos." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1140165836/34.
Повний текст джерелаRobin, Vincent. "Reconstruction of fire and forest history on several investigation sites in Germany, based on long and short-term investigations - Multiproxy approaches contributing to naturalness assessment on a local scale." Thesis, Aix-Marseille 3, 2011. http://www.theses.fr/2011AIX30057.
Повний текст джерелаConsidering two global observations in Central Europe of, firstly, the need for, and development of, sustainable and biological conservation practices for forest and/or woodland areas and, secondly, the lack of long-term fire history, an attempt has been made to reconstruct the fire and the forest history at several investigation sites in Germany. The overall data set gathered and analyzed has been used for on-site naturalness assessment. This latter notion is crucial for forest system conservation/restoration planning, considering the past human impact on forest dynamics. Also, in view of this past human impact on forest systems, which is well-documented for Central Europe, as occurring on a multi-millennium scale, an historical perspective perceptive that combined a long and short temporal scale of investigation was used.Nine investigation sites were selected, in order to include various and representative types of Central European forest. Therefore, the investigation sites were located in two main investigation areas. One is in Northern Germany (Schleswig-Holstein) and includes four investigation sites. The other is in Central Germany (Harz Mountains) and includes five investigation sites. Four main approaches were used. To assess the current state of the investigated site, forest stand characterization was undertaken (i.e. based on various forest attributes that concern stand structure and composition). Tree ring series were analyzed to provide insights about short-term forest tree population dynamics. Then, charcoal records from soil (combined with soil analysis) and peat sequences were qualitatively and quantitatively analyzed. These last two approaches also provide information about the past fire history. Forest current and short-term dynamics illustrated various levels of stand complexity, often corresponding to various levels of human impact that had been postulated. Eight mean site tree-ring chronologies, standardized in high and mid-frequency signal, spanning at a maximum of up to AD 1744 and at a minimum of up to AD 1923, were obtained. The insight, about the identification of events of growing changes and the correlated temporal and, if possible, spatial patterns, was discussed. Charcoal analysis provided a long-term insight about fire history. Based on 71 charcoal radiocarbon dates, it was shown on a macro-scale that there were two phases that had a greater frequency of fire - one during the transition from the late Pleistocene to the early Holocene, and one during the mid- and late Holocene. A strong human control during the most recent fire phase has been postulated. This is supported by on-site soil and peat charcoal record analysis, allowing one to point out the event of environmental changes (disturbances), at local scales. In the end, the on-site data from the various indicators were combined to assess the fire and forest history and the naturalness level of the investigated sites, based on past insights, thereby contributing to a better understanding of the present and helping to anticipate the future
Nifuku, Ko. "Oceanic redox conditions during the Early Aptian Oceanic Anoxic Event (OAEla) in the Vocontian Basin, SE France: A high-resolution reconstruction from a combination of ichnological and geochemical approaches." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120669.
Повний текст джерелаRobin, Vincent [Verfasser]. "Reconstruction of fire and forest history on several investigation sites in Germany, based on long and short-term investigations - Multiproxy approaches contributing to naturalness assessment on a local scale / Vincent Robin." Kiel : Universitätsbibliothek Kiel, 2011. http://d-nb.info/1045968153/34.
Повний текст джерелаKucharczak, Florentin. "Quantification en tomographie par émission de positons au moyen d'un algorithme itératif par intervalles. Contributions au diagnostic des démences neurodégénératives." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS048.
Повний текст джерелаPositron emission tomography (PET) is a nuclear imaging modality that has a prominent place in the neurodegenerative dementias diagnosis. After a reconstruction step, the most widely used radiopharmaceutical tracer, the 18F-FDG, provides a volume mapping of brain metabolism. The scintigraphic argument for dementia is based on the finding of a relative hypo-metabolism of one particular region of interest (ROI) to another, usually its contralateral symmetric. However, some case studies are very difficult to interpret with the naked eye, mainly at an early stage of the disease’s development. Until now, the development of (semi-)automatic tools for direct comparison of ROIs has been limited by the lack of statistical knowledge of the reconstructed data ; the main methods already developed preferring to use large databases to evaluate the reconstruction through a dissimilarity score compared to a group of control patients. In this thesis, we propose a new, fully integrated methodology, from reconstruction to assistance in the diagnosis of dementia. Based on the reconstruction of confidence intervals, the proposed approach allows 1/ direct access to information on the statistical variability of the data, 2/ reconstruction of qualitatively and quantitatively convincing images to facilitate the reading of the examination by the physician, 3/ provision of a risk score for the patient to be affected by a neurodegenerative dementia. The results obtained with the latter are comparable with tools validated in clinical routine, except that this method does not require any other information than PET acquisition data itself
Hammad, Mira. "Reconstruction of auricular cartilage using natural-derived scaffolds with an in vivo application in rabbit model Effects of hypoxia on chondrogenic differentiation of progenitor cells from different origins Cell sheets as tools for ear cartilage reconstruction in vivo Cartilage tissue engineering using apple cellulosic scaffolds Cell-secreted matrices as cell supports: Novel approaches for cell culture applications." Thesis, Normandie, 2021. http://www.theses.fr/2021NORMC404.
Повний текст джерелаSuccessful reconstruction of auricular cartilage defects requires the appropriate restoration of the cartilaginous deformities by potential cell sources as well as providing suitable tissue supports. This work aimed to investigate different scaffolds and biomaterials for in vitro auricular cartilage engineering as well as in vivo auricular cartilage repair in rabbit models. We first showed that auricular perichondrocytes are the best candidates for auricular cartilage regeneration and hypoxia is not necessary for their chondrogenic differentiation. These cells successfully formed cartilaginous cell sheets which were used to regenerate cartilage tissue in vitro and to fill and reconstruct cartilage defects in vivo in allogenic rabbit models. Furthermore, we tested cellulose-derived tissue by decellularizing apple tissue and its use as a scaffold. Repopulated with cells, these scaffolds surpassed alginate hydrogels by enhancing colonization and upregulating the cartilaginous expression in different mammalian cells. In the final part of the thesis, we examined cell-secreted matrices and used them as a coating for different cell culture applications. Interestingly, these coatings promoted both allo- and xenogeneic cell culture, increased proliferation, and boosted chondrogenesis. We also highlighted phenotype preservation during chondrocytes expansion on these cell-secreted matrices. Our study provides novel tools and approaches for multiple cell culture applications
Rambour, Clément. "Approches tomographiques structurelles pour l'analyse du milieu urbain par tomographie SAR THR : TomoSAR." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT007/document.
Повний текст джерелаSAR tomography consists in exploiting multiple images from the same area acquired from a slightly different angle to retrieve the 3-D distribution of the complex reflectivity on the ground. As the transmitted waves are coherent, the desired spatial information (along with the vertical axis) is coded in the phase of the pixels. Many methods have been proposed to retrieve this information in the past years. However, the natural redundancies of the scene are generally not exploited to improve the tomographic estimation step. This Ph.D. presents new approaches to regularize the estimated reflectivity density obtained through SAR tomography by exploiting the urban geometrical structures
Conjeevaram, Krishnakumar Naveen Kartik. "A Bayesian approach to feed reconstruction." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82414.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 83-86).
In this thesis, we developed a Bayesian approach to estimate the detailed composition of an unknown feedstock in a chemical plant by combining information from a few bulk measurements of the feedstock in the plant along with some detailed composition information of a similar feedstock that was measured in a laboratory. The complexity of the Bayesian model combined with the simplex-type constraints on the weight fractions makes it difficult to sample from the resulting high-dimensional posterior distribution. We reviewed and implemented different algorithms to generate samples from this posterior that satisfy the given constraints. We tested our approach on a data set from a plant.
by Naveen Kartik Conjeevaram Krishnakumar.
S.M.
Saribekyan, Hayk. "An amalgamating approach to connectomic reconstruction." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113173.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 57-60).
The reconstruction of neurons from connectomics image stacks presents a challenging problem in computer vision. The neuronal objects and their shapes, unlike the objects in natural images, vary greatly in shape and size. Recent methods for reconstruction of individual objects like the flood-filling networks and mask-extend showed a possibility of a new direction in the field. By using a CNN to track a single continuously changing object in the stack, much like a human tracer would do, they achieve a better accuracy than previous agglomeration algorithms. Unfortunately, these methods are costly for dense reconstruction of neurons in a volume as the number of CNN computations increases linearly in the number of objects. The cross classification clustering algorithm generalizes these accurate methods and tracks all objects in the volume at the same time. It uses only a logarithmic number of fully convolutional CNN passes by reformulating the complex clustering problem of unknown number of objects into a series of independent classifications on image pixels. These classifications together uniquely define the labels in each slice of the volume. We present a pipeline based on cross classification clustering that delivers improved reconstruction accuracy. A significant contribution of our pipeline is its streaming nature which will allow very large datasets to be segmented without storing them.
by Hayk Saribekyan.
M. Eng.
M.Eng. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
Scholze, Stephan. "A probabilistic approach to building roof reconstruction /." [S.l.] : [s.n.], 2002. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=14932.
Повний текст джерелаMoothandassery, Ramdevan Krishnadev. "Reconstruction Approach for Partially Truncated CT Data." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231159.
Повний текст джерелаTechnology
Liu, Peng. "Nonlinear statistical approach for 2.5D human face reconstruction." Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607166.
Повний текст джерелаChou, George Tao-Shun. "Large-scale 3D reconstruction : a triangulation-based approach." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86296.
Повний текст джерелаIncludes bibliographical references (p. [153]-157).
by George Tao-Shun Chou.
Ph.D.
Broadgate, Marianne L. "An integrated approach to palaeoenvironmental reconstruction using GIS." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/16947.
Повний текст джерелаAli, Zehra (Zehra Hyder). "Sustainable shelters for post disaster reconstruction : an integrated approach for reconstruction after the South Asia earthquake." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40402.
Повний текст джерелаIncludes bibliographical references (p. 67-69).
A year after the South Asia earthquake, over 60% of the survivors are still vulnerable due to the lack of adequate shelter, the absence of basic facilities for water and sanitation and livelihood restoration. The harsh topography, limited financial and human resources of the displaced and the environmental impact have resulted in the construction of shelters that do not directly address the improvement in living conditions and remain vulnerable to future disasters. This thesis presents an overview of an integrated approach towards making the reconstruction in the earthquake affected areas of Northern Pakistan more sustainable. The review of shelter solutions and practical recommendations aim at showing that there is no 'single best' solution in terms of shelter design. Rather a synthesis of low tech solutions for improving the sustainability and safety of existing shelters has been provided along with an understanding of the social mechanisms necessary to address local needs and priorities. There are three main components that have been included to provide the primary context and discuss the role and design for sustainable shelters in the earthquake affected areas of Northern Pakistan are the 'Review of Housing', 'Design' and the 'Structural test'.
(cont.) The review of housing focuses on understanding the current role of stakeholder participation in the construction of homes, the feasibility of constructing homes using indigenous building technology, criteria for assessing the sustainability of designs and in depth case studies on the different housing mechanisms ( owner driven reconstruction, participatory housing and contractor driven reconstruction). The best practices for shelter design and construction have been rearticulated in the 'Design' section, which provides an overview of some of the construction practices that exist and are being implemented in the field for the reasons of their efficiency, affordability and resourcefulness. The 'Structural Test' corroborates suggestions for improving layout and floor plan of unreinforced masonry construction. Apart from the design of the main structural components, innovations for improved seismic resistance, thermal efficiency, ventilation and roof-rainwater harvesting have been presented to improve the functionality of shelter. Thus by integrating use of suitable shelter materials, design and construction techniques, while also considering the implications indoor lighting, ,heating and cooking and the opportunities for livelihood generation, the construction of sustainable and safer shelters has been encouraged.
by Zehra Ali.
S.B.
Baumgartner, Kyrie A. "Neogene Climate Change in Eastern North America: A Quantitative Reconstruction." Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etd/2348.
Повний текст джерелаYin, Jianfeng. "Toward an alternative approach to multi-camera scene reconstruction." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21970.
Повний текст джерелаCette dissertation traite de différents aspects reliés à la reconstruction d'objets en 3D à partir d'images provenant de plusieurs caméras dans un environnement immersif de projection vidéo. Un des aspects est la correction des couleurs servant à compenser les différences entre caméras et projecteurs. Plusieurs méthodes sont analysées et une approche basée sur les réseaux neuronaux est proposée comme solution. Le probléme des régions cachées ou uniformes sur la construction des cartes de profondeur est aussi considéré. Comme amélioration, l'information de profondeur est propagée à l'aide de traitement non linéaire de diffusion basé sur des contraintes de gradient d'image. Contrairement aux méthodes traditionnelles telles le space carving et le shape-from-silhouettes, cette dissertation considére la reconstruction 3D comme un probléme de classication. Le défi consiste à trouver un attribut approprié afin de distinguer les points de surface de ceux qui n'en sont pas. Deux attributs sont proposés, l'un basé sur l'histogramme de couleurs des projections de chaque voxel sur toutes les caméras, l'autre sur la norme de Frobenius de la matrice d'entente des caméras. Le vote de tenseurs est employé pour raffiner la reconstruction et les résultats sont évalués expérimentalement sur des données réelles et synthétiques.
Robinson, Bruce T. "A multilevel approach to the algebraic image reconstruction problem." Thesis, Monterey, California. Naval Postgraduate School, 1994. http://hdl.handle.net/10945/28382.
Повний текст джерелаThe problem of reconstructing an image from its Radon transform profiles is outlined. This problem has medical, industrial and military applications. Using the computer assisted tomography (CAT) scan as an example, a discretization of the problem based on natural pixels is described, leading to a symmetric linear system that is in general smaller than that resulting from the conventional discretization. The linear algebraic properties of the system matrix are examined, and the convergence of the Gauss-Seidel iteration applied to the linear system is established. Next, multilevel technology is successfully incorporated through a multilevel projection method (PML) formulation of the problem. This results in a V-cycle algorithm, the convergence of which is established. Finally, the problem of spotlight computed tomography, where high quality reconstructions for only a portion of the image are required, is outlined. We establish the formalism necessary to apply fast adaptive composite (FAC) grids in this setting, and formulate the problem in a block Gauss-Seidel form. Numerical results and reconstructed images are presented which demonstrate the usefulness of these two multilevel approaches
Singh, Inderjeet. "Curve based approach for shape reconstruction of continuum manipulators." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1I042/document.
Повний текст джерелаThis work provides a new methodology to reconstruct the shape of continuum manipulators using a curve based approach. Pythagorean Hodograph (PH) curves are used to reconstruct the optimal shape of continuum manipulators using minimum potential energy (bending and twisting energy) criteria. This methodology allows us to obtain the optimal kinematics of continuum manipulators. The models are applied to a continuum manipulator, namely, the Compact Bionic Handling Assistant (CBHA) for experimental validation under free load manipulation. The calibration of the PH-based shape reconstruction methodology is performed to improve its accuracy to accommodate the uncertainties due to the structure of the manipulator. The proposed method is also tested under the loaded manipulation after combining it with a qualitative Neural Network approach. Furthermore, the PH-based methodology is extended to model multi-section heterogeneous bodies. This model is experimentally validated for a closed loop kinematic chain formed using two CBHA manipulating jointly a rope