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P. Goupillaud,
A. Grossman,
and J. Morlet.
Cycle-Octave and Related Transforms in Seismic Signal Analysis.
Geoexploration,
23:85--102,
1984.
Keywords:
Wavelets,
Multiscale Analysis.
| Abstract: |
High-resolution seismic methods are needed especially in oil and gas field development. They involve the use of backscattered energy rather than that of reflected signals, and make it interesting to look for representations of seismic traces in the time-frequency domain. One such representation was introduced by D. Gabor in 1946 into signal analysis; it is based on the consideration of a family of ``elementary wavelets'' that can be obtained from one ``basic wavelet'' by shifts in time and in frequency. We present here a different representation, in which frequency shifts are replaced by dilations. The resulting ``voice transformation'' and ''cycle-octave transform'' are briefly described from the mathematical point of view and illustrated by numerical examples. |
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Donald E. Knuth.
Literate Programming.
The Computer Journal,
27(2):97-111,
1984.
Keywords:
Literate Programming.
| Abstract: |
The author and his associates have been experimenting for the past several years with a programming language and documentation system called WBE. This paper presents WEB by example, and discusses why the new system appears to be an improvement over previous ones. |
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Shokri Z. Selim and M. A. Ismail.
Soft Clustering of Multidimensional Data: A Semi-Fuzzy Approach.
PR,
17(5):559--568,
1984.
Keywords:
Classification,
Clustering.
| Abstract: |
This paper discusses new approaches to unsupervised fuzzy classification of multidimensional data. In the developed clustering models, patterns are considered to belong to some but not necessarily all clusters. Accordingly, such algorithms are called `semi-fuzzy' or `soft' clustering techniques. Several models to achieve this goal are investigated and corresponding implementation algorithms are developed. Experimental results are reported. |
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