Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"gridding"”.
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Improved Methods for Gridding, Stochastic Modeling, and Compact Characterization of Terrain Surfaces
… are dense and non-uniform, including efficient gridding, stochastic modeling, and compact characterization. Terrain measurements are not collected with uniform spacing, which is necessary for efficient data storage and simulation. Many techniques are developed to help effectively grid dense …
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An improved microarray image analysis architecture using mathematical morphology
… noise removal, and followed by location gridding. However, it remains as a challenging task for microarray analysis due to the variation of noise that infested the images. In this study, microarray analysis architecture using mathematical morphology was proposed, namely Mathematical …
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DNA microarray image processing based on advanced pattern recognition techniques
In the present thesis, a novel gridding technique, as well as, two new segmentation methods applied to complementary DNA (cDNA) microarray images is proposed. More precise, a new gridding method based on continuous wavelet transform (CWT) was performed. Line profiles of x and y axis were …
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Accurate image reconstruction in radio interferometry
… this conclusion, Chapter 3 seeks to optimise the gridding process so as to make accurate dirty images. Since the Fast Fourier transform (FFT) produces dirty images with a much lower computational cost than the Direct Fourier transform (DFT), a new gridding function is needed which minimises the …
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Critical Issues in the Processing of cDNA Microarray Images
… images can be subdivided in three phases: gridding, segmentation and data extraction. To measure the gene expression levels, the processing of cDNA microarray images must overcome a large set of issues in these three phases that motivates this study. This study presents automatic gridding …
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Application:S3********
… capturing, filming, collecting, repeating, gridding, talking, sewing and creating, the exhibition took its shape and narrated a rather short story about a long, long, long journey.
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Computational and Experimental Comparison of a Powered Lift, Upper Surface Blowing Configuration
… tend to over-predict values of CL due to gridding issues and/or turbulence model selection. This thesis attempted to address both issues by performing Richardson’s Extrpolation method to determine an acceptable mesh size and by using FLUENT’s 2-equation turbulence models. The experimental …
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Development of Automatic CFD Grid Generation for the Design of the Preliminary Wing Sweep Schedule for the Gulfstream Quiet Supersonic Jet
… CFD analysis methods. The use of automating the gridding procedure allowed for numerous cases to be investigated. The examination of the drag polar for different Mach cases indicated the optimum corresponding wing sweep position. The study results revealed that for the Mach 0.85 case, the wings …
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Development of a Terrain Pre-filtering Technique applicable to Probabilistic Terrain using Constraint Mode Tire Model
… is divided into three parts. First a stochastic gridding method is developed to include the measurement uncertainties in the gridded terrain profile used as input to the vehicle simulation. The obtained uniformly spaced terrain is considered probabilistic, with a series of gridding nodes with …
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The soft grid
… designs has lead to increased demand for soft gridding systems as is evidenced by the profusion of Voronoi diagrams, pixelations, distorted grids and Danzer tilings in student and conceptual work. However, the built scale of such projects is rarely beyond installation largely because of the …
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Improved estimates and understanding of interannual trends of CO₂ fluxes in the Southern Ocean
… by investigating: the impact of increasing the gridding resolution of input data and proxy variables, and Support vector regression (SVR) and Random Forest Regression (RFR) as alternate machine learning methods. It was found that the improvement gained by increasing gridding resolution was …
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A projected multigrid method for the solution of non-linear finite element problems on adaptively refined grids
… This allows for a straightforward adaptive gridding scheme that does not need to take any special measures to repair these hanging nodes for a standard element-by-element implementation of the finite element assembly process. Specifically, on each element, only the usual finite element basis …
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Numerical simulation of two-dimensional Wolfhard-Parker burner
… solve the coupled system of equations. Adaptive gridding, numerical evaluation of Jacobians and iterations within time step are implemented for computational efficiency. Numerical results have been obtained for different fuels under different conditions. Comparison with measured data by Smyth et …
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Entwicklung und Optimierung nicht-kartesischer Techniken für die Magnetresonanzbildgebung
… durch T2*-Relaxation führen. Beim Gridding-Bildrekonstruktionsalgorithmus liefert die Dichte-Präkompensation mit der besten der untersuchten Wichtungsfunktionen eine um 11% schmalere Halbwertsbreite (FWHM) als die Postkompensation, die dafür ein um 67% günstigeres …
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Fluid flow and heat transfer in transonic turbine cascades
… calculated loss levels are independent of the gridding used while the heat transfer rate predictions improve with finer grids.
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Modeling and Control of Tensegrity-Membrane Systems
… (LPV) controller during system deployment. A gridding method is employed to discretize the system operational region in order to carry out the LPV control synthesis.
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Automatisches Segmentieren von Mikroarraybildern
… practical concerns, automation of microarray gridding and feature segmentation is most important to achieve constant data quality, which is a precondition to the integration of different expression data sets. Therefore, image processing methods that are applicable regardless of the employed …
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Development and application of a parallel compositional reservoir simulator
… complex reservoirs requires fine and detailed gridding, which involves a significant amount of memory and is computationally expensive. Nowadays, clusters of PCs and high-performance computing (HPC) centers are widely available. These systems allow parallel processing, which helps large-scale …
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Development and Optimisation of Radial Techniques for Sodium Magnetic Resonance Imaging
… NMR signal for total 23Na content evaluation. A gridding reconstruction algorithm with a Kaiser-Bessel window and a rho filter was implemented and optimised for both 23Na and 1H MRI. At an acquisition time Tacq= 10min and a nominal resolution Dx= 4mm, the signal-to-noise ratio SNR of the in-vivo …
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Mean-value modelling and robust control of the airpath of a turbocharged diesel engine.
… controller is synthesised for this model using a gridding approach for the intake manifold pressure as scheduling variable. The designed controller is implemented on the engine in real-time. The experimental results are very promising and indicate that the quasi-LPV model captures the significant …
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