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Text comparison using data compression

Platos J., Prilepok M., Snasel V.

Przegląd Elektrotechniczny

2013

R. 89, nr 11

59-61

Similarity detection is very important in the field of spam detection, plagiarism detection or topic detection. The main algorithm for comparison of text document is based on the Kolmogorov Complexity, which is one of the perfect measures for computation of the similarity of two strings in defined alphabet. Unfortunately, this measure is incomputable and we must define several approximations which are not metric at all, but in some circumstances are close to this behaviour and may be used in practice.

W artykule omówiono metody rozpoznawania podobieństwa tekstu. Głównie używanym algorytmem jest Kolmogotov Complexity. Głównym ograniczeniem jest brak możliwości dane algorytmu są trudne do dalszego przetwarzania numerycznego – zaproponowano szereg aproksymacji.

Fault diagnosis of actual large-power high-voltage windings using transfer function method

Rahimpour E., Tenbohlen S.

Archives of Electrical Engineering

2011

Vol. 60, nr 3

269-281

The transfer function (TF) method is presently a well-known method used to detect various types of winding damage in power transformers. Although abundant research has been done on this subject using laboratory windings as test objects, it is hard to find one, whose test objects are actual large-power transformer windings. Hence, a 400 kV disc winding consisting of 86 discs is used in this paper to study turn-to-turn short circuit with the help of the TF method. To evaluate the effects of this type of fault on TF curves, some mathematical comparison algorithms are used in this research.