A data warehouse stores huge amounts of data collected from multiple sources and enables users to query that data for analytical and reporting purposes. Data in a data warehouse can be represented as a multidimensional cube. Data warehouse queries tend to be very complex, thus their evaluation requires long hours. Precomputing a proper set of the queries (building subcubes) may significantly re...

Full-color displays have become commonplace with the advent of the Web. Typically they are rendered from desktop computers equipped with 16-bit color palettes capable of generating 65K unique colors. Thus a chart or scale is needed for making informed color selections for graphics applications. In SAS, the programmer has access to both the RGB (red/green/blue) and HLS (hue/light/saturation) cod...

introduction: wavelet transform is one of the useful and suitable tools for time series and signal analysis. nowadays wavelet transform is frequently used in geophysical data processing and interpretation, especially seismic data. however, the use of this method isn’t widespread in gravity and geomagnetic. fedi and quarta (1998), martelet et al. (2001) and de oliveira lyrio (2004) used the wave...

This paper describes a high-performance &pecial-purpose system, the Cube-3 machine, for displaying and manipulating high-resolution volumetric datasets in real-time. Cube-3 will allow scientists, engineers, and biomedical researchers to interactively visualize and investigate their static high-resolution sampled, simulated, or computed volumetric dataset . Furthermore, once acquisition devices ...

spectral decomposition is a powerful tool for analysis of seismic data. fourier transform determines the frequency contents of a signal. but for analysis of non-stationary signals, 1-d transform to frequency domain is not sufficient. in early years, transforming of seismic traces into time and frequency domain was done via windowed fourier transform, called a short time fourier transform (stft)...

Introduction Musculoskeletal MRI is commonly done with two-dimensional fast-spin-echo (2D-FSE) and multiple acquisition planes. This results in anisotropic voxels, partial volume artifact and slice gaps. Three-dimensional fast-spin-echo (3D-FSE-Cube), allows for isotropic voxel acquisition with FSE contrast, diminishing the drawbacks of 2D-FSE while reducing exam time and allowing for image ref...

In recent years, Global Positioning System (GPS) has been greatly utilized in collecting real-time geographic data for a mobile unit. With the latest developments in the technologies of Geographic Information System (GIS) and wireless communications, the location data collected by a GPS unit could be easily displayed in a real-time fashion. However, for large scale applications such as a taxi f...

Pre-computed data cube facilitates OLAP (On-Line Analytical Processing). It is a well-known fact that data cube computation is an expensive operation, which attracts a lot of attention. While most proposed algorithms devoted themselves to optimizing memory management and reducing computation costs, less work addresses one of the fundamental issues: the size of a data cube is huge when a large b...

Recent research on external-memory search has shown that disks can be effectively used as secondary storage when performing large breadthfirst searches. We introduce the Write-Minimizing Breadth-First Search (WMBFS) algorithm which is designed to minimize the number of writes performed in an external-memory BFS. WMBFS is also designed to store the results of the BFS for later use. We present th...