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 54 for “"MTF"”.
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Feature selection to enhance android malware detection using modified term frequency-inverse document frequency (MTF-IDF)
… Term Frequency – Inverse Document Frequency (MTF-IDF) algorithm give more focus on both sample and features to give correct weight value to some features. The proposed algorithm considered features based on its level of importance where weight given based on number of features involved in the …
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Effects of field of view, MTF shape, and noise upon the perception of image quality and motion
… that common display characteristics, such as MTF shape, noise, and field of view, have on a display observer's ability to perceive egocentric motion from a display. The third and final objective was to provide a discussion of the use of image quality metrics for the evaluation of displays that …
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The direct measurement of system Modulation Transfer Function (MTF) for an AN/AVS-6 Aviator's Night Vision Imaging System (ANVIS)
… has been ignored. Modulation Transfer Function (MTF) performance specifications have been extensively researched for the components of night vision imaging systems such as the lenses and the image intensifier tube. The current method for calculating the system MTF is to combine the MTFs of all …
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A Phenomenological Study of Acceptability of Preexposure Prophylaxis Therapy within the Lived Experiences of HIV Negative Male-to-Female Transgender Young Adults
The male-to-female transgender (MtF-TG) are individuals assigned a male gender at birth but self identify as female. MtF-TG young adults experience discrimination, stigmatization, isolation, and homelessness as a result of gender identity and gender expression. The transgender populations are …
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Theoretical and Experimental Evaluation of Spatial Resolution in a Variable Resolution X-Ray Computed Tomography Scanner
… presampling modulation transfer function (MTF), and the post-reconstruction spatial resolution, given by the scanner reconstruction MTF. The detector presampling MTF was modeled by the Monte Carlo simulation and measured by the moving-slit method. The modeled results showed the increase in …
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Using On-line Analytical Processing (OLAP) and data mining to estimate emergency room activity in DoD Medical Treatment Facilities in the Tricare Central Region
… of the Military Medical Treatment Facility (MTF) emergency room (ER) manager to improve ER staffing and utilization. MTF ER managers use statistical data analysis to help manage the efficient operation and use of ERs. As the size and complexity of databases increase, traditional statistical …
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Accurate characterization of nanophotonic grating structures
… the device using a Modulation Transfer Function, MTF, technique. MTF is commonly measured using either the line pair method or the slant edge method. This thesis proposes a new method to measure MTF using single pixel illumination and point spread function. Results from the two systems are …
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Design and optimization of imaging systems by engineering the pupil function
… systems are the modulation transfer function (MTF) and the point spread function (PSF). These two functions are standard measures for evaluating the performance of an imaging system. Usually during the design process one finds the PSF or MTF for all the possible degrees of freedom and chooses …
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Camera Spatial Frequency Response Derived from Pictorial Natural Scenes
… focuses on the Modulation Transfer Function (MTF), a widely used camera performance measurement employed to describe resolution and sharpness. Traditionally measured under controlled conditions with characterised test charts, the MTF is a measurement restricted to laboratory settings. The MTF …
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The Use of Morphogenic Transcription Factors to Enhance Plant Regeneration
… factors). Morphogenic transcription factors (MTFs) are a category of genes that coordinate the expression of multiple other genes, guiding the step-by-step formation of organs and embryos. We identified several MTFs that enhance root explant regeneration efficiency through a two-step …
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The Exploration of a Combination Therapy on Voice Feminization for Male-to-Female Transgender Individuals
… the voice and communication for male to female (MTF) trans individuals Method: Two MTF participants were randomly selected from a pool of 4 participants and were randomly assigned to a team of clinicians. CVC therapy was delivered once a week for 50 minutes for seven weeks. It targeted pitch, …
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Scene-Dependency of Spatial Image Quality Metrics
… image quality. The Modulation Transfer Function (MTF) and Noise Power Spectrum (NPS) describe the signal (contrast) transfer and noise characteristics of a system, respectively, with respect to spatial frequency. They are both, strictly speaking, only applicable to linear systems since they are …
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The role of Zinc and Reactive Oxygen Species in the Regulation of Endothelial Nitric Oxide Synthase
… heavy metal-responsive transcription factor 1, MTF-1, which then would bind to the eNOS 5'-regulatory MRE. We found that basal zinc levels in endothelial cells (ECs) helped maintain eNOS promoter activity and total protein levels, but did not affect eNOS dimer levels. However, supplementing ECs …
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The role of Zinc and Reactive Oxygen Species in the Regulation of Endothelial Nitric Oxide Synthase
… heavy metal-responsive transcription factor 1, MTF-1, which then would bind to the eNOS 5'-regulatory MRE. We found that basal zinc levels in endothelial cells (ECs) helped maintain eNOS promoter activity and total protein levels, but did not affect eNOS dimer levels. However, supplementing ECs …
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Spatial Resolution Analysis of a Variable Resolution X-ray Cone-beam Computed Tomography System
… and axial modulation transfer functions (MTF), are analyzed in three different situations: (1) when the FPD is tilted only about its vertical axis (<em>v</em>), (2) when the FPD is tilted only about its horizontal axis (<em>u</em>), and (3) when the FPD is tilted isotropically about both …
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Design of a dynamic calibration phantom to be used to calculate the temporal resolution of a tomographic imaging device
… of temporal Modulation Transfer Function (t-MTF) can be used to enable characterization of temporal resolution. A scanner's t-MTF represents the percent amplitude modulation in the image as a function of the input frequency. The calibration device uses slotted disks mounted to planetary gear …
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Analyse der T-Zellstimulation durch RNA-elektroporierte dendritische Zellen
… mit der RNA des Tumorantigens Melanotransferrin (Mtf) elektroporiert und mit T-Zellen, spezifisch für das erst kürzlich identifizierte HLA-DRB1*0401-präsentierte Mtf668-683-Epitop, inkubiert. Eine spezifische Stimulation der T-Zellen durch Mtf-RNA-elektroporierte DC konnte detektiert werden. …
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Modulation transfer function and the role of focal length of a photogrammetric camera in image generation.
… Function. A comparative study is made of the MTF obtained from two lens cones under various aperture settings, detail size and light conditions. This includes an analysis by graphical methods.
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System characterisation of a full body slit scanning radiography machine : theory and experiment
… detector was developed and the theoretical DQE, MTF and NPS were compared to measure values of the RQA7 beam quality described in IEC 6222-1. The effect on Detector DQE of various system parameters such as coupling efficiency, CCD noise and pixel binning was quantified. Also detector performance …
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