Features Extraction

Ravi et al. extracted features from raw data using a window size of 256 samples with 128 overlapping between consecutive windows. Sampling rate used is 50Hz which equivalent to 5.12s for each window. The calculated features are mean, standard deviation, energy and correlation. A single triaxial accelerometer was worn near the pelvic region in the…

Window Segmentation Techniques

Preece et al. explained windowing techniques are used in most activity classification researches. In real-time applications, windows are defined concurrently with data collection. There are three different windowing techniques which are sliding windows, event-defined windows and activity-defined windows. The sliding window technique divided signals into fixed length (window) with no inter-window gap. The range of…

Body Area Sensor Networks: Requirements, Operations, and Challenges

B. Johny and A. Anpalagan suggested health-care monitoring challenges can be tackled by interfacing sensors and actuators which form body area networks (BANs) with the human body together with the support of wireless technology and mobile and cloud computing [1]. Three stages of health-care monitoring system have been defined, which are sensors, data hub and…

Focus areas of context-aware research

1. Activity recognition [1][4][5][8][13] 2. Specific activity [2] 3. System [3][9][11] 4. Energy management [6][15] 5. Augmentation [7] 6. Data intepretation/Processing [10][19] 7. Reasoning [1][12][16][17][18] 8. Modeling [14] [1] F. Zhou, J. Jiao, S. Chen, and D. Zhang, ‘A Case-Driven Ambient Intelligence System for Elderly in-Home Assistance Applications’, IEEE Transactions on Systems, Man, and Cybernetics,…

Class of physical activities

Physical activities can be classified into dynamic, static and postural transition. Activities that are characterized by large movements such as walking and running are classified as dynamic activity, while static activity is defined by activities that involve small movement such as sitting, lying down and standing. Postural transitions is the movements that change from one…