Fuzzification of the Input

The rules that the fuzzy system uses are expressed in terms such as a high or a medium pH, while the experimental input data are numerical quantities. The first stage in applying these rules is to transform the input data into a degree of membership for each variable in each class through the use of membership functions. 

The pKa values for the two ionizations of fumarase can be determined experimentally to be approximately 5.9 and 7.5, thus these figures provide an appropriate way to define what, in the context of this problem, is meant by medium pH (Table 8.3). 

Relationship between pH and Membership of the Low, Medium, and High pH Sets 

The relationship between concentration and membership in the low and high concentration sets. TABLE 8.4 

---