Summarize each article in one page:

1. Glabella: Continuously Sensing Blood Pressure Behaviour using an Unobtrusive Wearable Device
2. HeartSense: Ubiquitous Accurate Multi-Modal Fusion-based Heart Rate Estimation Using Smartphones
3. Predicting System Trajectories of Schizophrenia using Mobile Sensing
4. SeismoWatch: Wearable Cuffless Blood Pressure Monitoring Using Pulse Transit Time
5. SugarMate: Non-intrusive Blood Glucose Monitoring with Smartphones

1. (Holz & Wang, 2017) – Glabella: Continuously Sensing Blood Pressure Behaviour using an Unobtrusive Wearable Device

Problem Addressed or problem statement

Cardiac health serves as a significant indicator related to patients' health. To monitor cardiac health, blood pressure is monitored because it keeps changing during a patient's regular work and due to seasons. A method or system to continuously monitor blood pressure in response to various stimuli is needed. BP data is required for physicians to understand how the individual will respond to certain foods, drugs, and observe variations in blood pressure throughout the day to understand patterns with cardiac health. 

Proposed solution

By Monitoring blood pressure physicians can manage and adjust patient's prescription according to patient responses to treatment. The authors present Glabella – a lightweight wearable device which measures continuous blood pressure using pulse sensors fit into the frame in a pair of glasses. The device will measure the pulse signals at three places around the patient's head to monitor the patient's blood pressure on a beat-by-beat basis conveniently, unobtrusively and throughout the day.

Technique used (method, devices, etc.)

Glabella will sense pulse reflections from three locations on the head to record motions and pulse transit time. It runs on a battery. The pulse signals collected are processed to extract the wearer's pulse transit time, measured as the temporal difference in pulse arrival times between two time intervals, between two sensors – the preauricular skin pit on the patient's angular artery and the orbital region on the wearer's superficial temporal artery or the area behind the ear (occipital artery).

The devices used are sensors (to capture pulse), the processor to process the signal collected from the sensors, and storage.

Evaluation

The Glabella device was tested with four users for five days, throughout the day (12 hours). The device was evaluated by comparing its effectiveness with wearable cuff and smartphone-based monitoring. The data collected from Glabella sensors were analysed using statistical techniques.

Results

Glabella showed the potential to collect data continuously and record the signals. It is a viable option to continuously monitor blood pressure on short-term basis, and the device is a socially acceptable prototype which is unobtrusive for the user.

(Some parts of the solution has been blurred due to privacy protection policy)