Appendix C:Types of Fuzzy Membership Function
There are many kinds of fuzzy membership functions. Commonly used fuzzy membership functions are mainly Z-type, S-type, the intermediate symmetric type, and so on.
1. Z-type
Z-type is also known as partial small type, and it is suitable for membership function of small u. Because the membership function distributes in the first quadrant, the values of u are positive. The descending semi-rectangular distribution, descending semi-normal distribution, descending semi-г distribution, descending semi-Cauchy distribution, descending semi-trapezoid distribution, descending semi-mountain-shaped distribution, descending semi-concave (convex) distribution, and so on belong to this class.
(1) Descending semi-trapezoid ...
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