. 2020 Nov 20;17(22):8644. doi: 10.3390/ijerph17228644

Table 3.

Initial configuration of the technical risk inference system

Technical Risk Fuzzy Inference System.
Input data	Range	Output data	Range
Oxygen saturation	70–100%	Technical Risk	0–100 ¹
		¹ Actual range is 10–100, for more details see Section 2.2.1.
Temperature	33–41 °C	Initial configuration
		Fuzzy structure: Mamdani–type. Membership function type: trapezoidal. Defuzzification method: centroid [58].	Implication method: MIN. Aggregation method: MAX. Number of fuzzy rules: 45.
Heart rate	15–180 b.p.m	Subset of the 45 fuzzy rules 1. IF (O2_Saturation is Very_Low) AND (Pulse is Normal) THEN (Technical_Risk is R5) 2. IF (O2_Saturation is not Very_Low) AND (Temperature is Normal) AND (Heart_Rate is Normal) THEN (Technical_Risk is R1) 3. IF (O2_Saturation is not Very_Low) AND (Temperature is Normal) AND (Heart_Rate is High) THEN (Technical_Risk is R1)

Example of combination of fuzzy rules 2 and 3