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activity recognition wearable sensors mhealth human behavior digital health sensor displacement motion sensors ontology android health devices mobile health emotion recognition wearable computing human behaviour sensor network kinect hci transfer learning weighted decision sensor fusion emg sensors human anatomy ontologies sensor placement context-awareness sensor selection quantified self big data smartphone segmentation machine learning motivational messages human behavior inference smart coaching cognitive assessment smartphones windowing mobile computing physiological monitoring portable sensors mhealth framework digital image watermarking discrete wavelet transform optimal color-channel selection coefficients quantization app ehealth window size knowledge bases big information user interface binary classification hierarchical classification benchmark dataset multisource fusion fitness exercises e-monitoring imu gesture recognition meta-classifier knowledge extraction decision fusion feature selection ambulatory monitoring real-world activity recognition sensor anomalies ambient sensors hierarchical weighted classifier biomedical sensors e-health inertial sensing ipr publications mhealth system android wear breast cancer heart rate sensor kinematics sensors smartwatch energy expenditure arm mobility mobile sens- ing natural language processing biosignal signal processing smart tech biodata artificial intelligence ai affective computing facial expression recognition speech recognition eeg ecg sensors social computing mobile phone e-coaching iot lifestyle user experience cloud computing personalized recommendations big knowledge social networks data fusion ensemble methods location detection social analysis trunk endurance physical therapy inertial sensors context inference onto- logical reasoning context recognition human behavior identication knee alignment depth video reflective markers frontal plane projection angle patellofemoral pain syndrome anterior cruciate ligament gamification wearables physical activity cancer performance status innovation patents