An AVAF inversion method for detecting hydrocarbons

A method for 2-dimensional inversion of gravity data

Applying 2D algorithms for inverting the potential field data is more useful and efficient than their 3D counterparts, whenever the geologic situation permits. This is because the computation time is less and modeling the subsurface is easier. In this paper we present a 2D inversion algorithm for interpreting gravity data by employing a set of constraints including minimum distance, smoothness,...

An Unsupervised Method for Detecting Grammatical Errors

We present an unsupervised method for detecting grammatical errors by inferring negative evidence from edited textual corpora. The system was developed and tested using essay-length responses to prompts on the Test of English as a Foreign Language (TOEFL). The errorrecognition system, ALEK, performs with about 80% precision and 20% recall.

An adaptive method for detecting dominant points

In this paper, we propose an adaptive method for the polygonal approximation of a digitized curve. Instead of setting a ÿxed length of support region in advance, the new method will compute the suitable length of support region for each point to ÿnd the best approximated curvature. The dominant points are identiÿed as the points with local maximum curvatures. In addition, the break point detect...

An Iterative Inversion Method For Blind Source Separation

An approximate method for Abel inversion using Chebyshev polynomials

Many problems in physics like reconstruction of the radially distributed emissivity from the line-of-sight projected intensity, the 3-D image reconstruction from cone-beam projections in computerized tomography, etc. lead naturally, in the case of radial symmetry, to the study of Abel’s type integral equation. In this paper, a new stable algorithm based on shifted Chebyshev polynomial approxima...