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...Ijacsa international journal of advanced computer science and applications vol no feature engineering for human activity recognition basma a atalaa ibrahim ziedan ahmed alenany helmi department systems faculty zagazig university egypt abstract har techniques can relatively limited resources smart devices therefore significantly contribute to the enhancement health life numerous studies in literature have been conducted look care elderly people these which suitable representative features activities as well good generally operate on data collected from wearable sensors or enough models moreover benchmark datasets those embedded most phones attracted available are different type number increasing interest recently this paper random forest based recorded examples each experimental settings classifier is proposed i e controlled procedure whether indoor outdoor trained using set time domain extracted environments used sensor position raw after being segmented into windows subject body accor...