Activity classifications Activity recognition 1 Classification accuracy 1 Decision trees 1 Elderly people 1 Electric power transmission networks 1 Grid monitoring 1 K-means clustering 1 Learning algorithms 1 Monitoring 1 Monitoring environment 1 Monitoring system 1 Open systems 1 Pattern recognition 1 Smart grid 1 Smart power grids 1 Stackings 1 Supervised learning 1 Wired and wireless 1