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| Reference | Research findings | Limitations |
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| A. M. Khan et al. (2010) | An accelerometer sensor depends on human-activity recognition | A single triaxial accelerometer connected to the chest produced an average accuracy of 97.9%. |
| J. Parkka et al. (2006) | Classification of activities using wearable sensor-based MD | Less classification accuracy using decision tree classifier and also for Artificial Neural Network (ANN) |
| M. A. Case et al. (2015) | Tracking activity and health of humans while walking on treadmill using MD | Results did not produce significant clinical benefit for patients having chronic knee pain |
| Mao Ye et al. (2011) | POI recommendation service through social networks | Social and geographical influence produces less effectiveness due to miscommunication through the social network. |
| Q. Tang et al. (2016) | A privacy-preserving hybrid RS using incremental matrix factorization and user-based collaborative filtering component | Feature vector components produce less efficient for privacy-preserving |
| S.L. Wang et al. (2016) | A hybrid predictive model that combines Markov chain and Grey Theory for predicting moving object’s path | The cost for tracking errors is more for moving objects |
| Samsung, Apple (2017) | They have developed a wearable device for monitoring the heartbeat. | Less accuracy while measuring the heartbeat of human |
| D. Singh et al. (2015) | E-healthcare monitoring applications that require secure 6LoWPAN networks | Communication through protocols produces more challenges through embedding services. |
| A.H. Sodhro et al. (2018) | A novel framework for highly prevalent healthcare that manages to combine data transmission control and duty-cycle adaptation. | Produces more energy consumption while processing through the on-WBAN channel. |
| T. Shaw et al. (2017) | Developed a conceptual practice-based model of e-health to assist health professionals | Thermotical analyses produce less specific by restrictive ease of translation. |
| Samir Mustapha et al. (2020) | Continuous structural health monitoring systems to detect damage assessment and failure prediction. | Costlier while moving for real-time monitoring system |
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