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 26 for “"Sub-sampling"”.
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Efficient Community Detection for Large Scale Networks via Sub-sampling
… One of the main contributions is proposing a new sub-sampling method to make existing spectral clustering method scalable by reducing the computational complexity. Also, we have implemented extreme points algorithm for a general multiple communities detection case along with a sub-sampling based …
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An optical-electrical sub-sampling down-conversion receiver with continuous-time [Sigma] [Delta] modulation
… and implementation of an optical-electrical sub-sampling down-conversion receiver that employs [Sigma] [Delta] modulation. Accurate sub-sampling of an electrical RF signal in the optical domain is achieved by using a low-jitter mode-locked-laser and a high-bandwidth interferometer. The …
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Advanced parallel magnetic resonance imaging methods with applications to MR spectroscopic imaging
… for parallel MRI with arbitrary k-space sub-sampling is developed. Regularization methods using the singular value decomposition of the encoding matrix and pre-conditioning of the forward model are proposed to desensitize the solution from data noise and model errors. Variable density …
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Statistical Methods for Reliability Data from Designed Experiments
… data from life tests. We focus on data from a sub-sampling experimental design. The new analysis methods are illustrated on a popular reliability data set, which contains sub-sampling. Monte Carlo simulation studies evaluate the capabilities of the new modeling methods. Additionally, Monte …
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Pseudoproxy modelling to explore ecosystem dynamics and assess uncertainties in palaeoecology
… of uncertainty introduced from core mixing, sub-sampling and proxy counting to determine which individual and combined sources of uncertainty have the greatest influence on the analyses. Results suggest that individual sources of uncertainty, such as sub-sampling frequency, have a greater …
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An on-chip test circuit for characterization of MEMS resonators
… and with decreasing device size into the submicron scale, variability has started to become a critical issue in MEMS resonators, and thus vigorous characterization of important device parameters has become necessary. This project proposes an on-chip test circuit that can accurately …
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Sampling characteristics of the bus route survey technique in the James River, Virginia
… system, I conducted four 4-day intensive sampling days, two weekend and two week days, in Areas 1 and 4 during each year. During these periods a complete as possible access-point survey was conducted simultaneously with the bus route survey. Surveyors for both techniques collected effort, …
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An examination of block motion compensation algorithms for MPEG-2 and prediction of bit rates from video sequence measurements
… MAD and MSE, and maximises cross-correlation. Sub-sampling, hierarchical and feature domain methods were examined. Finally some new algorithms are proposed and further areas of research suggested. The new algorithms suggested perform close to optimum, particularly those algorithms searching …
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Fish scales as ecological indicators: empirical approaches to improve their practical application to fish ecology
… family as the focal species. Cyprinids are of substantial global, socio-economic importance as their communities are valued ecologically, commercially and recreationally. The research assessed current methodologies, highlighted extant gaps in knowledge and sought to resolve these issues. It …
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Multi-resolution dental image registration based on genetic algorithm
… develop techniques for registration of extracted subject regions of interest with corresponding reference regions of interest.;We investigated and implemented registration using two multi resolution techniques namely image sub sampling and wavelet decomposition. Multi resolution techniques help in …
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Development of error correction techniques for nitrate-N load estimation models
… nutrient loads. This study used a Monte Carlo sub-sampling method and error-corrected statistical models to estimate annual nitrate-N loads from two watersheds in central Illinois. The performance of three load estimation methods (the seven-parameter log-linear model, the ratio estimator, and …
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Past Environmental Change On The Eastern Andean Flank, Ecuador
… older material. <br></br><br></br> A statistical sub-sampling tool was developed (debate i), capable of producing statistically robust count sizes for each pollen sample; MTW and MTE count sizes ranged from 196-982 showing the diversity within sequences. The depositional environment of MTE was …
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Data Driven Selective Sensing for 3D Image Acquisition
… systems to make educated decisions. While sub-sampling offers a naïve solution for reducing dataset dimension after acquisition, it does not capitalize on the knowledge available in already acquired data to selectively and dynamically drive the acquisition process over the most significant …
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Cluster-Based Bounded Influence Regression
… include (1) computational approximations and sub-sampling variability, (2) dramatic coefficient sensitivity with respect to very slight differences in initial values, (3) internal instability when determining the general trend and (4) performance in low-breakdown scenarios. A new …
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Compositions, logratios and geostatistics: An application to iron ore
… density. This assertion is tested through sub-sampling of the initial data to create four subsets of successively lower spatial densities representing densities, spacings, and orientations typical of the different stages of mine development. The same compositional geostatistical approach …
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Probabilistic models for mobile phone trajectory estimation
… two ways to address these limitations: (a) subsampling GPS to save energy, and (b) using alternatives to GPS such as WiFi localization, cellular localization, and inertial sensing (with the accelerometer and gyroscope) that consume less energy and work indoors. The key challenge is to match …
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Spectrum sharing in next generation wireless communication networks
… and our approach reduces the exclusion zone size substantially. We also propose the access methods between different tiers in LSA and SAS, regarding the interference measurement and user selection of secondary users, efficient PAL detection with sub-sampling and LTE/WiFi coexistence in the …
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DISSOLUTION OF AEROSOL IRON IN SEA WATER USING FLOW-INJECTION WITH CHEMILUMINESCENCE DETECTION
… and integrated with an incubation system for sub-sampling during dissolution experiments of aerosol iron in seawater. Fast release of iron f r om the aerosol particles occurred within the first 2 h, followed by a decrease over 1 day. Preliminary experiments w i t h UV-irradiated seawater …
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Content and Stylistic Models for Authorship, Stance, and Hyperpartisan Detection
… hyperpartisan news detection after topic-based sub-sampling of the news training data.
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Systems and circuits for broadband contactless and wireline transceivers
… PLL and an open loop quadrupler. A sub-sampling error extraction (SSEE) technique is introduced to fully detect the deterministic jitter (DJ) in the output clock at much lower speeds with minimal power overhead. An orthogonal 3-path LMS-based adaptation algorithm is implemented to …
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