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 9 of 9 for “"data cubes"”.
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Privacy-preserving data publishing and analytics using data cubes
Data cubes play an essential role in data analysis and decision support. In a data cube, data from a fact table is aggregated on subsets of the table's dimensions, forming a collection of smaller tables called cuboids. When the fact table includes sensitive data such as salary or diagnosis, …
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VRDAV is: remote visualisation of astronomy data with a standalone virtual reality device
… the challenges of visualising vast astronomy data cubes using a virtual reality environment, addressing the ever-increasing volume of data collected by radio astronomy instruments. As the amount of data grows year after year—ranging from terabytes to petabytes—radio astronomy researchers face …
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Smooth Interactive Visualization
… is a powerful tool for understanding large datasets. However, many commonly-used techniques in information visualization are not C^1 smooth, i.e. when represented as a function, they are either discontinuous or have a discontinuous first derivative. For example, histograms are a non-smooth …
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The automated detection and multiwavelength properties of LADUMA HI galaxies
… over the low redshift Early Science LADUMA data cube using the SoFiA-2 algorithm. The source finding mask created in this work will be used to clean the first public data release of the LADUMA data cubes, which will be outlined in an upcoming paper. We present the confirmed SoFiA-2 …
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Optimisation of galaxy identification methods on large interferometric surveys
The astronomical size of spectral data cubes that will result from the SKA pathfinders planned large HI surveys such as LADUMA; Fornax HI survey; DINGO; WALLABY; etc. necessitate fully automated three-dimensional (3D) source finding and parametrization tools. A fraction of the percentage difference …
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A multi-molecular line study of an entire giant molecular cloud
… were used to characterise this large set of data cubes: GAUSSCLUMPS and principal component analysis (PCA). We found the clumps are heavily fragmented with a beam filling factor of ~0.2. We found no correlation between clump radius and line width, contradicts to Larson's Law. Possible …
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Neutral hydrogen mass distributions in galaxies uncovered by three-dimensional stacking
… research extending this concept to the parent data-cube of the one-dimensional spectra is a growing area of research. Studies such as those by (Chen et al., 2021; Sinigaglia et al.,2022) focus on stacking in three-dimensions to improve the point-spread function, HI signal detectability, and …
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Towards interactive analytics over voluminous spatiotemporal data using a distributed, in-memory framework
The proliferation of heterogeneous data sources, driven by advancements in sensor networks, simulations, and observational devices, has reached unprecedented levels. This surge in data generation and the demand for proper storage has been met with extensive research and development in distributed …
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A Westerbork blind HI imaging survey of the Perseus-Pisces filament in the Zone of Avoidance
… of galaxies. With the resulting spectral line data cubes of an angular resolution of 23" x 16" and a velocity resolution of 16.5 km s⁻¹ with a rms sensitivity of ~ 0.4 mJy/beam, we detect 211 galaxies within the entire surveyed volume. These new HI detections reveal a total of four distinct …