TY JOUR TI APPROACH TO IMPROVING THE EFFICIENCY OF BUILDING REAL-TIME PERSONALIZED RECOMMENDATIONS IN CLOUD E-LEARNING SYSTEMS KW recommender systems KW e-learning systems KW graph databases JO Automation and modeling in design and management AU Gerashchenkova, T.M. AU Goncharov, D.I. AU Markelov, A.O. PY 2022 IS 2022 PB Bryansk State Technical University