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 36 for “"correction algorithm"”.
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Development of correction algorithm for pulsed terahertz computed tomography (THz-CT)
… inside the material. In this dissertation, an algorithm has been developed to remove these refractive and finite beam size effects from THz-CT reconstructed images. The algorithm is successfully implemented on cylindrical shaped objects. A longer term goal of the research is to study the …
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Implementation,Validation and Application of an Automated Motion Correction Algorithm in Hepatic Perfusion CT for Image-Guided Radiotherapy
… are: 1) to develop and validate a registration algorithm to reduce breathing motion artifacts in hepatic perfusion CT, and 2) to evaluate the potential of perfusion CT to improve radiotherapy of liver cancer. An automated one-dimensional correlation-based registration algorithm was developed and …
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Effects of OCR errors on text categorization
… In, particular, we present a lexicon-based error correction algorithm to improve the categorization process. This algorithm is based on edit distance techniques and information from highly weighted words in the categorizers.
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Design and development of an autonomous scaled electric combat vehicle
… previously developed mapping and path planning algorithms in addition to a developed localization algorithm are implemented to achieve autonomous navigation. Furthermore, a vision-based close quarter pose correction algorithm is designed and developed to improve upon the limitations imposed by …
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Acoustic Frequency Domain Reflectometry
… is tested using several novel signal processing algorithms for strain determination and is estimated to have a resolution of 0.58 °C over a 20 cm gauge length. An error correction algorithm to improve SNR in the measurement of strain is proposed and validated. The sensing system has a theoretical …
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Development of novel methodologies for utilising low-cost sensors for ambient Particulate Matter measurement
… application and assessment of a three-stage correction process which allows low-cost sensors to provide quantitative PM measurements. The first step is to account for the particle hygroscopic growth under high RH conditions. This led to the development of two correction methodologies: 1) a …
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Seawinds Radiometer Brightness Temperature Calibration And Validation
… vector. On QuikSCAT, a ground data processing algorithm was developed, which allowed the instrument to function as a QuikSCAT Radiometer (QRad) and measure the ocean microwave emissions (brightness temperature, Tb) simultaneously with the backscattered power. When SeaWinds on ADEOS was …
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Diffractive optics for maskless lithography and imaging
… theoretical studies. A novel proximity-effect correction algorithm that was implemented effectively in a ZPAL system is also described. Variations to another diffractive lens known as the photon sieve are proposed. The first ever lithography results performed using these new elements are …
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Cross-validation of spaceborne radar and ground polarimetric radar observations
… impair the accuracy of rain rate retrieval algorithms derived from PR signal returns, which makes it necessary to compensate for attenuation effects. Independent evaluation and verification of attenuation correction, and subsequent rain rate estimation, derived from spaceborne algorithms is …
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Implementation of a snow routine into the hydrological model WASA-SED and its validation in a mountainous catchment
… snow cover data. Furthermore, a rainfall gauge correction algorithm to restore the liquid precipitation signal of measurements affected by solid precipitation was applied. The snow module proved to be able to capture the dynamics of the snow cover forming during the cold months of the year. The …
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Algorithms for indoor localization based on IEEE 802.15.4-2011 UWB and inertial sensors
… novel bilateral transmitter output power control algorithm which is demonstrated to be able to stabilize the multipath channel, and enable sub 5cm instant ranging accuracy in line of sight conditions. A fully-coupled architecture is proposed for the localization system using a combination of IEEE …
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Efficient automatic correction and segmentation based 3D visualization of magnetic resonance images
… volumes has increased substantially. Existing algorithms, however, still often require manual interaction, and newly developed automated techniques are often intended for a narrow segment of processing needs. The goal of this research was to develop algorithms suitable for fast and effective …
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Analysis and Improvement of the bRAPID Algorithm and its Implementation
… and the implementation and validation of two new algorithms for improved burnup simulation. bRAPID is a fuel burnup algorithm capable of performing full core 3D assembly-wise burnup calculations in real time, through its use of the RAPID Fission Matrix methodology. A study into the effect of time …
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Uncertainty analysis of acoustic flow measuring instruments for characterization of high energetic river flow
… on multiple inputs which are processed using algorithms made accessible online. A typical result of the error analysis at a velocity of 1.10 m/s a maximum deviation of 23% is observed between the measured and expected streamwise velocity at an instrument pitch angle of 45 degree. After …
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Direct numerical simulation of bubble-bubble and droplet-droplet interaction using a Surface Thin Film model
… grid on parallel processors using a pressure correction algorithm to converge the pressure at each time step. The study is restricted to gas-liquid systems where particles could either be bubbles or droplets; rigid particles are not considered. The model is tested against experimental results …
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New Model And Simulation Algorithm Of Nonstationary Non-gaussian Ground Motions Based On S-transform
… be Gaussian. A new iterative power and amplitude correction algorithm is proposed to simulate nonstationary non-Gaussian stochastic processes. This procedure is successfully implemented and illustrated by numerical examples.
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Design, Implementation and Validation of an Attitude Determination Subsystem for Nanosatellites
… of each sensing items. Results shown that a lens correction algorithm is needed to have a better accuracy on data computed from the camera used. The current design show that the sun sensor is accurate within 8 degree half cone and the earth sensor is accurate within 1 degree half cone. First …
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Techniques for Stochastic Implicit Surface Modelling and Rendering
… form of new and improved modelling and rendering algorithms to deal with stochastic implicit surfaces that can be complex and feature fractal scaling properties. On the modelling side, a new topological correction algorithm is proposed to detect disconnected surface parts that arise as a …
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Development and validation of a gastroenterology probe capable of measuring the position of the squamo-columnar junction
… drift, capable of causing misdiagnosis. A correction algorithm was produced which corrected linear drift, removing time dependant drift leading to significantly more accurate pressure readings. Catheter based upper gastro-oesophageal measurements have the potential to cause transient lower …
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