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FClass/RClass systems - the fuzzy sets and rough sets based approaches to classification under uncertainty

Drwal G.

Archiwum Informatyki Teoretycznej i Stosowanej

2000

T. 12, z. 2

89-105

This paper presents a new software environment designed as a tool for data validation and the classification of uncertain information. The environment consists of two systems: FClass and RClass. These systems use fuzzy set theory-based methods (FClass) and rough set theory-base methods (RClass) to allow handling of uncertain information. We have also proposed and implemented two hybrid classification methods (so-called fuzzy-rough and rough-fuzzy), in which we tried to combine the advantages of both fuzzy and rough methods. The FClass/RClass systems were designed as typical knowledge based systems consisting of three main parts: knowledge base, inference engine and user interface. Such architecture made it easier to implement them as object-oriented applications.

Artykuł przedstawia środowisko programowe przeznaczone do klasyfikacji danych niepwenych. System składa się z dwóch części: FClass i RClass. Część FClass wykorzystuje zbiory rozmyte, natomiast część RClass została zbudowana w oparciu o zbiory przybliżone. Proponowane podejście do problemu klasyfikacji wykorzystuje obydwie te teorie, próbując połączyć je dla uzyskania lepszych rezultatów dzięki połączeniu zalet obydwóch metod.

Statistical and deterministic aspects of treatment decision making in patients with multivessel coronary artery disease

Walichiewicz P., Mróz Z., Drwal G.

Archives of Control Sciences

2000

Vol. 10, no. 3/4

185-196

Data of 137 patients with multivessel coronary artery disease were analyzed retrospectively to determine what clinical information had any relation with the selected treatment method. The deterministic analysis indicates a larger number of factors influencing the choice of treatment than the statistical analysis. Elements significant for the choice of treatment, determined both by deterministic analysis and statistical analysis: state of LAD below D1, state of D1, peripheral part of RCA, systolic function of antero-lateral segment, global left ventricular ejection fraction in angiography and echocardiography. Deterministic analysis proved that in the process of reaching the decision about choice of treatment, physicians took into consideration the results of large randomized trials, i.e. patient's age, state of left ventricular ejection fraction and state of proximal LAD segment (in this paper: state of LAD above first diagonal branch). Statistical analysis pointed only to the state of ejection fraction.