4. Inference process
The swine disease diagnosis used a forward inference. The inference process was divided into three steps. First
step was inference in disease screening, second step was inference in the diagnosis using symptom and third step
was inference in the diagnosis using lesion are shown in fig.1
First step, the inference began from taking the input swine’s gender and age range. Result of disease screening
was preliminarily possible disease. Second step, the inference began from taking the input symptoms and its
certainty factor to calculate the certainty factor of the E (CF(E)), and then calculated the certainty factor of occurred
disease (CF(H,E)), performed rule selection and made diagnosis respectively. Result of diagnosis was possible
swine disease. Third step, the inference began from taking the input lesion and made diagnosis respectively. Result
of diagnosis was confirmation of morbidness.