Automatic development of fuzzy membership functions on hepatitis patients data using particle swarm optimization (PSO)

Information about the status of disease (prognosis) for patients with hepatitis is important to determine the type of action to stabilize and cure this disease. among some system,fuzzy system is one of the methods that can be used to obtain this prognosis. in the fuzzification process,the determination of the exact range of membership function will influence the calculation of membership degree and of course will affect the final value of fuzzy system. this range and function can usually be formed using intuition or by using an algorithm. in this paper,particle swarm optimization (pso) algorithm is implemented to form the triangular membership functions in the case of patients with hepatitis. for testing process,this paper conducts four scenarios to find the best combination of pso parameter values . based on the testing it was found that the best parameters to form a membership function range for the hepatitis data is about 0.9,0.1,2,2,100,500 for inertia max,inertia min,local ballast constant,global weight constant,the number of particles,and maximum iterations respectively. © 2015 penerbit utm press. all rights reserved.