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 23 for “"subsampled"”.
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Pel-adaptive model-based interpolation of spatially subsampled images
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Development of a three-dimensional camera based on subsampled optical coherence tomography (OCT)
… Next, to demonstrate high-speed optical domain subsampled imaging, we developed a novel wavelength-stepped laser source based on intra-cavity pulse compression/stretching; this source provided an A-line rate of ~19 MHz. We then built a polarization-based quadrature interferometer to remove …
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Optical domain subsampling for data-efficient optical coherence tomography (OCT)
… reducing the acquisition bandwidth. Optically subsampled lasers utilize a discrete set of wavelengths to alias fringe signals along an extended depth range into a bandwidth limited window. By detecting the complex fringe signals and under the assumption of a depth-constrained signal, optical …
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Novel Fast Algorithms For Low Rank Matrix Approximation
… allowing fast multiplication by a vector. The Subsampled Randomized Hadamard Transform (SRHT) is the most popular among transforms. An m x n matrix can be multiplied by an n x l SRHT matrix in O(mn log l) arithmetic operations where typically l << min(m, n). This dissertation introduces an …
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Holocene environmental change and the vegetation community dynamics of the Kynsna forest : pollen and charcoal analysis of sediments from Groenvlei, Southern Cape, South Africa
… were described, dated by radiocarbon means and subsampled for the analysis of fossil pollen and charcoal particles, environmental proxies used respectively to infer a vegetation and fire history for the region.
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Effects of Aerial LiDAR Data Density on the Accuracy of Building Reconstruction
… BC to different densities and inputting each subsampled dataset to reconstruction using two different reconstruction methods. We then determine the accuracy of reconstruction based on manually created reference data, in terms of both 2D footprint accuracy and 3D model accuracy. We find that …
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THE BROWN BEAR GUT MICROBIOME: A NOVEL TOOL FOR CONSERVATION & MANAGEMENT
… bear health metrics. To achieve these aims, I subsampled archived brown bear fecal samples collected during United States National Park Service research activities at three National Parks and Preserves and extracted microbial DNA for 16S rRNA amplicon sequencing and microbial taxonomic …
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SIP : a smart digital image processing library
… including direct application of transforms in subsampled YCbCr and YCrCb images.
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Essays in Problems in Sequential Decisions and Large-Scale Randomized Algorithms
… squares algorithm, \textit{Guluru}, based on subsampled randomized Hadamard transform, to solve a wide class of generalized linear models.
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Statistical analysis of networks with community structure and bootstrap methods for big data
… We develop a new resampling method called subsampled double bootstrap (SDB) for both independent and stationary data. SDB works by choosing small random subsets of the massive data, and then constructing a single resample from that subset using bootstrap (for independent data) or moving …
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Effects of hexavalent chromium on the growth and reproduction of Chironomus riparius (Diptera)
… and chromium-treated 21 1 aquaria. Larvae were subsampled at 5-day intervals, measured for length, and weighed to generate growth curves. Emerging adults were allowed to mate and oviposit. Twenty female pupae were collected from control and treatment (0.5 mg/1) populations within 12 hours of …
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Modal analysis of vertical array receptions for the Heard Island Feasibility Test
… The least squares performance given a subsampled basis set of modes was studied and improved upon through the use of diagonal loading. Lack of array orientation data hindered the analysis, and least squares fitting was used to estimate the most likely orientation. The least squares …
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Use of bioelectrical impedance analysis (BIA) to predict water and energy content of juvenile Rainbow Trout (Oncorhynchus mykiss)
… testing. Tissue samples were collected from the subsampled trout for future caloric and compositional analysis via bomb calorimetry and proximate analysis. It was found that BIA demonstrated a strong predictive relationship with regard to energy content (r2 = 0.90), total body water (r2 = 0.89) …
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A multi-disciplinary approach to the characterization of waterlogged burial environments : assessing the potential for the in situ preservation of organic archaeological remains
… Hatfield Moor and Sutton Common. Cores were subsampled at depth intervals down to 100 cm depth, to allow for the examination of the vertical distributions of the variables being studied. Redox potential, water level variation and other physico-chemical parameters were measured down the soil …
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Physiological and behavioral responses, and their variability, in squid, Doryteuthis pealeii, embryos and paralarvae reared under chronic ocean acidification
… season. I ran swimming behavior experiments with subsampled paralarvae from 2013 - 2015 and developed a novel 3D recording and analysis tracking system in the process. The 2D data from 2013 showed significant decreases in time spent near surface, while 3D data in subsequent years showed slight …
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Physical Control of Biological Processes in the Central Equatorial Pacific: A Data Assimilative Modeling Study
… models. When assimilating synthetic data subsampled using the resolution of the JGOFS EqPac cruises, parameters governing processes such as grazing, growth, mortality and recycling can be recovered exactly. The assimilation of phytoplankton time-series data, as are currently available from …
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Penalised regression for high-dimensional data: an empirical investigation and improvements via ensemble learning
… We apply a penalised regression method to each subsampled dataset and average the results. In the first step, subsampling is informed by variable correlation structure, and in the second step, by variable importance measures from the first step. STRANDS can be used with any sparse penalised …
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Archean continental crust formation and the rise of atmospheric oxygen
… In order to obtain suitable precision for subsampled domains, it was necessary to develop analytical techniques (Chapter 3) suited to small-volume analysis of the U-Pb and Lu-Hf isotope systems in zircon (via both laser ablation and solution analysis). In contrast to the whole rock Nd …
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Persistence of Depositional Features in a Strongly Seasonal, Tide-Dominated Delta
… characteristics on tidal channel banks, and subsampled for subsequent textural analysis. In more than half of the cores examined there is no change in the style of the laminations, suggesting that the processes controlling deposition remain constant throughout the year, despite a change in …
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Analyzing the Dynamics of Biological and Artificial Neural Networks with Applications to Machine Learning
… estimations of critical brain dynamics even from subsampled data. Finally, we bridge the gap between machine learning and neuroscience by exploring the concept of excitatory-inhibitory balance, a crucial feature of neuronal networks in the brain, within the framework of reservoir computing. We …
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