A technique for reducing a tagset used for n-gram part-of-speech disambiguation is introduced and evaluated in an experiment. The technique ensures that all information that is provided by the original tagset can be restored from the reduced one. This is crucial, since we are interested in the linguistically motivated tags for part-of-speech disambiguation. The reduced tagset needs fewer parame...

The main task of the present work is to apply some methods for knowledge reductions in the case of knowledge based on equivalence relations. Topological techniques are applied to construct knowledge bases via general relations. Topological structures are used to obtain discernibility matrix and discernibility function for knowledge reduction and decision making. Topology plays a significant rol...

Rough sets theory is a method to represent, analyze, and manipulate knowledge in an information table. To remove superfluous attributes without changing the original knowledge, reduction is a must in rough sets. The process of finding all reducts has been proven to be NP-hard. In order to find an efficient method to generate all reducts, this paper develops the pseudo consistency method. Simula...

Vowel reduction suppresses phonetic information in the speech signal and should be understood as having an analogous impact on phonological representations. Reduction follows two apparently contradictory routes in vowel space, yielding either centralised values (the ‘centripetal’ pattern) or the corner values a, i, u (the ‘centrifugal’ pattern). What unifies these vowels is the relative simplic...