Kurniasari, Dian and Mahyunis, Ranti Vidia and Warsono, Warsono and Nuryaman, Aang (0223) IMPLEMENTATION OF ARTIFICIAL NEURAL NETWORK (ANN) USING BACKPROPAGATION ALGORITHM BY COMPARING FOUR ACTIVATION FUNCTIONS IN PREDICTING GOLD PRICES. Kumpulan JurnaL Ilmu Komputer (KLIK), 10 (1). pp. 93-105. ISSN 2406-7857