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Showing 1 to 16 of 16 for “"Data Cube"”.
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Multidimensional aggregation in OLAP systems
… processing (OLAP) provides multidimensional data analysis to support decision making. OLAP queries require extensive computation based on aggregation along many dimensions and hierarchies. The time required to process these queries has traditionally prevented the interactive analysis of large …
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Tweets2Cube: Interactive spatiotemporal knowledge acquisition from massive social media
We present the Tweets2Cube system that uncovers the patterns underlying people's spatiotemporal activities from massive online social media. Tweets2Cube organizes unstructured social media records into a multi-dimensional data cube along three dimensions: (1) what is the user's activity; (2) where …
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Data mining with bilattices
Data mining has become a key research area in database after Agrawal and Sirkant introduced association rules in data mining and proposed Apriori for mining association. However, most of the works focuses on finding patterns on itemsets, especially associations between items. With the fast …
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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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Spectral analysis of the helium nova V445 Puppis
… spectra were then recombined into a data cube to create a three-dimensional picture of the emission from the nova.
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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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Analysis of SALT Fabry-Pérot medium resolution data
… So optical high spatial resolution of 2 arcsec data of NGC 7361, NGC 7424 and NGC 7793 have been obtained. The major object of this thesis was to test SALT Fabry-Pérot medium resolution data in order to pursue the survey of all the MHONGOOSE sample, and to be able to compare the accuracy of the …
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ETANA-CMV: A coordinated multiple view visual browsing interface for ETANA-DL
… and easy to learn. This interface employs a data cube based browsing index to counter performance issues that usually limit the interactivity of visual browsing interfaces to DLs. The interface has been integrated with the existing Browse Interface and the search service in ETANA-DL. …
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Computational spectral microscopy and compressive millimeter-wave holography
… spatially encodes the object spectral data and nonnegative</p> <p>least squares inversion combined with a series of reconfigured two-dimensional (2D spatial-spectral) scanned measurements enables three-dimensional (3D) (x, y, λ) object estimation. The second sensor is a coded …
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Energy disaggregation techniques for visualization and improvement of energy efficiency in processes and buildings
… has coincided in time with the rise of data-driven models, such as machine learning or data visualization techniques, which has led many researches to incorporate data-driven solutions into energy efficiency problems, with the ultimate goal of increasing the energy awareness of the user. …
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Text cube: construction, summarization and mining
A large portion of real world data is either text or structured (\eg, relational) data. Such data objects are often linked together (\eg, structured product information linking with their descriptions and customer reviews.). To systematically analyze large numbers of such textual documents, it is …
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Efficient computation of advanced skyline queries.
… such as multi-criteria decision making, data mining and visualization, and user-preference queries. Due to its importance, skyline and its computation have received considerable attention from database research community recently. All the existing techniques, however, focus on the …
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Computational Optical Imaging Systems for Spectroscopy and Wide Field-of-View Gigapixel Photography
… between voxels in the spatial-spectral data cube to compressively sample the power spectral density with minimal loss in spatial-spectral resolution while maintaining high temporal resolution.</p><p>Photography is limited by similar physical constraints. Low f/# systems are required for …
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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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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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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 …