Catherine Liao

Techniques to acquire non-invasive cuffless blood pressure (BP) involve measuring arterial pulsations to analyze pulse waveform shape (i.e. pulse waveform analysis [PWA]) or propagation time of the pulse wave (i.e. pulse transit time, [PTT]) then correlating with BP. Several sensor types can be utilized for this purpose. We present a common database of arterial pulse pressure waveforms from a PPG sensor, an applanation tonometer, a continuous noninvasive arterial pressure (CNAP) reference… Show more

Techniques to acquire non-invasive cuffless blood pressure (BP) involve measuring arterial pulsations to analyze pulse waveform shape (i.e. pulse waveform analysis [PWA]) or propagation time of the pulse wave (i.e. pulse transit time, [PTT]) then correlating with BP. Several sensor types can be utilized for this purpose. We present a common database of arterial pulse pressure waveforms from a PPG sensor, an applanation tonometer, a continuous noninvasive arterial pressure (CNAP) reference device, and our own millimeter-wave wearable radar device. Show less

We present a novel approach that uses radar for continuous and cuffless noninvasive BP (cNIBP) in a wrist-worn device. Radar's non-contact nature means arterial pulsation can be captured without needing tight contact against skin.

Wearable monitors for measuring vital signs such as blood pressure will greatly impact the medical field. This work presents a millimeter-wave, radar-based system for performing accurate measurements of systolic and diastolic blood pressure at the radial artery. A 120-subject study was conducted to assess the feasibility of the proposed approach. Blood pressure was determined using a one-time initialization process that converts radar output into pressure units (in mmHg). Measured systolic and… Show more

Wearable monitors for measuring vital signs such as blood pressure will greatly impact the medical field. This work presents a millimeter-wave, radar-based system for performing accurate measurements of systolic and diastolic blood pressure at the radial artery. A 120-subject study was conducted to assess the feasibility of the proposed approach. Blood pressure was determined using a one-time initialization process that converts radar output into pressure units (in mmHg). Measured systolic and diastolic blood pressure values against a clinical reference device show promise for beat-to-beat blood pressure measurement in a variety of healthcare settings. Show less

A new wearable sensor using millimetre-wave radar and electromagnetic technology provides 64 signals reflected from one radar sinusoidal signal beamed around the radial artery. It is non-invasive, can be non-contact, and is potentially simpler in acquiring the radial pulse then tonometry.

Wearable monitors for measuring vital signs such as blood pressure will greatly impact the medical field. This work presents a millimeter-wave, radar-based system for performing accurate measurements of arterial pulse waveforms without contacting the region that is pulsing. Electromagnetic and radar-system simulation models are utilized to demonstrate the viability and safety of this approach. This is followed by hardware/software implementation and a study on 12 human subjects. Measured radial… Show more

Wearable monitors for measuring vital signs such as blood pressure will greatly impact the medical field. This work presents a millimeter-wave, radar-based system for performing accurate measurements of arterial pulse waveforms without contacting the region that is pulsing. Electromagnetic and radar-system simulation models are utilized to demonstrate the viability and safety of this approach. This is followed by hardware/software implementation and a study on 12 human subjects. Measured radial arterial waveforms exhibit signal strengths that are well above the noise floor of the system and a morphology that would be expected in an arterial pulse. Finally, comparison of the radar-based signals with a reference tonometer indicates a strong correlation between waveforms, as well as similar spectral signatures. The results observed suggest a millimeter-wave based approach for arterial pulse detection is very promising for future applications in pulse wave analysis and pulse transit time measurement for blood pressure tracking. Show less

Mobile apps have become big business. Once they came pre-loaded onto mobile phones and were largely distributed by mobile phone carriers. Consumers had limited choice, and developers had limited access to the market. All that changed with the arrival of the app store: first from Apple, and then from every other major platform. App stores have been with us for less than a decade but already there are more than a million mobile apps available across the mobile platforms, and by 2016 the mobile… Show more

Mobile apps have become big business. Once they came pre-loaded onto mobile phones and were largely distributed by mobile phone carriers. Consumers had limited choice, and developers had limited access to the market. All that changed with the arrival of the app store: first from Apple, and then from every other major platform. App stores have been with us for less than a decade but already there are more than a million mobile apps available across the mobile platforms, and by 2016 the mobile app market is expected to generate $74 billion in revenue.

While there exist a host of different models to make money through mobile apps, there is an expectation that most apps will be free. Competition is also strong in the mobile app market. Each week tens of thousands of new mobile apps are released and app developers have to work hard to get their mobile apps noticed. Only mobile apps that truly innovative can rise above the crowd.

This book looks to provide its readers a deeper understanding of the evolution and dynamics of the mobile app economy. Using a combination of primary research and case studies, the book provides useful tools for evaluating the market potential of new mobile apps and how to market them. The research findings and case studies also provide food for thought in defining a new business model or reinforcing existing decisions. Show less