A review of the optimization methods used in the design of type-2 fuzzy systems, which are relatively novel models of imprecision, is presented in this paper. The main aim of the work is to study the basic reasons for optimizing type-2 fuzzy systems for solving problems different areas of application. Recently, nature-inspired methods have emerged as powerful optimization algorithms for solving...

Whether the design of knowledge base or the modeling of complex systems, when systems are characterized as complex systems with high dimension and a variety of variables and factors, to reduce complexity are necessary. Fuzzy cognitive maps (FCM) are a soft computing method for simulation and analysis of complex system, which combines the fuzzy logic with theories of neural networks. It is flexi...

Fuzzy logic is a powerful method because of its ability to allow the knowledge in the model to be extracted and interpreted by knowledge system. Fuzzy modeling is an approach which implements the fuzzy logic in the process of modeling the system. But in the construction of the complex system, there is a limitation of fuzzy model due to the large number of related input and output, dealing with ...

Users often have vague or imprecise ideas when searching the databases and thus may not know how to precisely formulate queries that lead to satisfactory answers. Based on the fuzzy set thoery, this paper proposes a fuzzy query approach which can support the expression of fuzzy queries and translate the fuzzy query into the precise query in order to provide relevant answers to the users. The fu...

Fuzzy set theory has been extensively applied to extend various data models and resulted in numerous contributions, mainly with respect to the popular relational model or to some related form of it. To satisfy the need of modeling complex objects with imprecision and uncertainty, recently many researches have been concentrated on fuzzy semantic (conceptual) and object-oriented data models. This...

many factors affect yield loss in wheat harvesting with a grain combine harvester and there is no mathematical model to describe the behavior of this complex system. thus in this study, a fuzzy logic controller (flc) was designed, implemented and tested for the automatic settings of cylinder speed, concave clearance, fan speed and forward speed of a model 955 john deere combine. first, the mech...