In a previous paper, we have proposed a fuzzy extension of Allen’s Interval Algebra, called IA, which is able to model soft temporal constraints and uncertainty in a unified way. In this paper, we address the problem of finding tractable subalgebras of IA, as it has been done in the classical case. In particular, we show that the fuzzy extensions of classical SAc and SA subalgebras are tractabl...

In this paper we shall study some properties for upper Qfuzzy subgroups, some lemma and theorem for this subject. We shall study the upper Qfuzzy index with the upper fuzzy sub groups; also we shall give some new definitions for this subject. On the other hand we shall give the definition of the upper normal fuzzy subgroups, and study the main theorem for this. We shall also give new results on...

The genetic algorithm has been widely used in many fields as an easy robust global search and optimization method. This paper introduces a new approach to find fuzzy rules using niche genetic algorithms with elitist migrating operator. It uses binary coding scheme. In order to make search results stable, elitist migrating operator reserves good individuals into an elitist sub-population. The si...

This study deals with prioritization of sustainable supply chin measurement indicators which are calculated by using Chang’s extent method of Fuzzy AHP. Within the model of Fuzzy AHP, main attributes, sub attributes and indicators are defined. The weights of them are calculated from the answers of questionnaire, which is formed for pair-wise comparison of attributes and indicators. The results ...

The identiication of fuzzy models can sometimes be a diicult problem, often characterized by lack of data in some regions, collinearities and other data deecien-cies, or a sub-optimal choice of model structure. Regu-larization is suggested as a general method for improving the robustness of standard parameter identiication algorithms leading to more accurate and well-behaved fuzzy models. The p...

Rigorous analysis of the determinants of volumetric mass transfer coefficient (kLa) and its accurate forecasting are of vital importance for effectively designing and operating stirred reactors. Majority of the available literature is limited to systems with low solids concentration, while there has always been a need to investigate the gas-liquid hydrodynamics in tanks handling ...

Sensitivity Analysis of Combat Desertification Strategies in Fuzzy Environment Yazd-Khezrabad Sub-Catchment (Saduq County)

In this contribution, the biological problem of extracting promoters (composed of two nucleotide sequences, TTGACA and TATAAT, separated by among 15 and 22 pairs of bases) from E. coli DNA sequences is tackled. Classical approaches for this problem, based on considering probabilistic models of the promoter motifs, fail at performing accurate predictions due to the difficulty of properly integra...