The estimation of the fuzzy membership function parameters for interval type 2 logic system (IT2-FLS) is a challenging task in presence uncertainty and imprecision. Grasshopper optimization algorithm (GOA) fresh population based meta-heuristic that mimics swarming behavior grasshoppers nature, which has good convergence ability towards optima. main objective this paper to apply GOA estimate opt...

This paper presents the application of interval type-2 fuzzy inference systems (IT2FIS) in short term load forecasting (STLF) on special days. This is a continuation work of application interval type-2 fuzzy systems (IT2FSs) using Karnik Mendel algorithm. Special days here mean local Balinese holidays such as national and local culture-based public holidays, consecutive holidays, and days prece...

This article concerns a connection of fuzzy logic and lattice theory. Namely, the fuzzy sets form a Heyting lattice with union and intersection of fuzzy sets as meet and join operations. The lattice of fuzzy sets is defined as the product of interval posets. As the final result, we have characterized the composition of fuzzy relations in terms of lattice theory and proved its associativity.