Richard H. Y. So
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View article: DiffPhys: Enhancing Signal-to-Noise Ratio in Remote Photoplethysmography Signal Using a Diffusion Model Approach
DiffPhys: Enhancing Signal-to-Noise Ratio in Remote Photoplethysmography Signal Using a Diffusion Model Approach Open
Remote photoplethysmography (rPPG) is an emerging non-contact method for monitoring cardiovascular health based on facial videos. The quality of the captured videos largely determines the efficacy of rPPG in this application. Traditional r…
View article: Feasibility and Acceptability of Universal Adult Screening for Chronic Hepatitis B in Primary Care Clinics
Feasibility and Acceptability of Universal Adult Screening for Chronic Hepatitis B in Primary Care Clinics Open
Consistent with Centers for Disease Control and Prevention guidelines, implementing universal chronic hepatitis B screening in primary care clinics in Northern California was feasible, was acceptable to providers and patients, eased health…
View article: Contactless Blood Oxygen Saturation Estimation from Facial Videos Using Deep Learning
Contactless Blood Oxygen Saturation Estimation from Facial Videos Using Deep Learning Open
Blood oxygen saturation (SpO2) is an essential physiological parameter for evaluating a person’s health. While conventional SpO2 measurement devices like pulse oximeters require skin contact, advanced computer vision technology can enable …
View article: Identification of the human cerebral cortical hemodynamic response to passive whole-body movements using near-infrared spectroscopy
Identification of the human cerebral cortical hemodynamic response to passive whole-body movements using near-infrared spectroscopy Open
The human vestibular system is crucial for motion perception, balance control, and various higher cognitive functions. Exploring how the cerebral cortex responds to vestibular signals is not only valuable for a better understanding of how …
View article: SE Territory: Monaural Speech Enhancement Meets the Fixed Virtual Perceptual Space Mapping
SE Territory: Monaural Speech Enhancement Meets the Fixed Virtual Perceptual Space Mapping Open
Monaural speech enhancement has achieved remarkable progress recently. However, its performance has been constrained by the limited spatial cues available at a single microphone. To overcome this limitation, we introduce a strategy to map …
View article: Prediction of Higher Heating Values in Bio-Oil from Solvothermal Biomass Conversion and Bio-Oil Upgrading Given Discontinuous Experimental Conditions
Prediction of Higher Heating Values in Bio-Oil from Solvothermal Biomass Conversion and Bio-Oil Upgrading Given Discontinuous Experimental Conditions Open
Both the conversion of lignocellulosic biomass to bio-oil (BO) and the upgrading of BO have been the targets of many studies. Due to the large diversity and discontinuity seen in terms of reaction conditions, catalysts, solvents, and feeds…
View article: Vection induced by a pair of patches of synchronized visual motion stimuli covering total field of views as small as 10 square-degrees
Vection induced by a pair of patches of synchronized visual motion stimuli covering total field of views as small as 10 square-degrees Open
Vection (illusion of self-motion) is known to be induced by watching large field-of-view (FOV) moving scenes. In our study, we investigated vection induced by small FOV stimuli. Three experiments were conducted in 45 sessions to analyze ve…
View article: Robust Heart Rate Variability Measurement from Facial Videos
Robust Heart Rate Variability Measurement from Facial Videos Open
Remote Photoplethysmography (rPPG) is a contactless method that enables the detection of various physiological signals from facial videos. rPPG utilizes a digital camera to detect subtle changes in skin color to measure vital signs such as…
View article: Blood Pressure Measurement: From Cuff-Based to Contactless Monitoring
Blood Pressure Measurement: From Cuff-Based to Contactless Monitoring Open
Blood pressure (BP) determines whether a person has hypertension and offers implications as to whether he or she could be affected by cardiovascular disease. Cuff-based sphygmomanometers have traditionally provided both accuracy and reliab…
View article: Geometric simplification for reducing optic flow in VR
Geometric simplification for reducing optic flow in VR Open
Today virtual reality (VR) technologies became more and more
\nwidespread and found strong applications in various domains. However
\nthe fear to experience motion sickness is still an important
\nbarrier for new VR users. Instead of movin…
View article: Harvesting Partially-Disjoint Time-Frequency Information for Improving Degenerate Unmixing Estimation Technique
Harvesting Partially-Disjoint Time-Frequency Information for Improving Degenerate Unmixing Estimation Technique Open
The degenerate unmixing estimation technique (DUET) is one of the most efficient blind source separation algorithms tackling the challenging situation when the number of sources exceeds the number of microphones. However, as a timefrequenc…
View article: Deep Learning Methods for Remote Heart Rate Measurement: A Review and Future Research Agenda
Deep Learning Methods for Remote Heart Rate Measurement: A Review and Future Research Agenda Open
Heart rate (HR) is one of the essential vital signs used to indicate the physiological health of the human body. While traditional HR monitors usually require contact with skin, remote photoplethysmography (rPPG) enables contactless HR mon…
View article: Active head rolls enhance sonar-based auditory localization performance
Active head rolls enhance sonar-based auditory localization performance Open
Animals utilize a variety of active sensing mechanisms to perceive the world around them. Echolocating bats are an excellent model for the study of active auditory localization. The big brown bat ( Eptesicus fuscus ), for instance, employs…
View article: Visually Induced Roll Circular Vection: Do Effects of Stimulation Velocity Differ for Supine and Upright Participants?
Visually Induced Roll Circular Vection: Do Effects of Stimulation Velocity Differ for Supine and Upright Participants? Open
Visually induced circular vection (CV) has been the subject of a wide range of functional brain and behavioral research. Participants in MRI or PET studies on CV were mostly in a supine viewing position, while participants in behavioral st…
View article: Prevalent osteoporotic vertebral fractures more likely involve the upper endplate than the lower endplate and even more so in males
Prevalent osteoporotic vertebral fractures more likely involve the upper endplate than the lower endplate and even more so in males Open
Osteoporotic EPFs more likely involve the upper endplate rather than lower endplate, with a trend for this effect to be greater in men than in women. These characteristics may help radiographic differential diagnosis for osteoporotic EPF.
View article: Adversarial relationship between combined medial olivocochlear (MOC) and middle-ear-muscle (MEM) reflexes and alarm-in-noise detection thresholds under negative signal-to-noise ratios (SNRs)
Adversarial relationship between combined medial olivocochlear (MOC) and middle-ear-muscle (MEM) reflexes and alarm-in-noise detection thresholds under negative signal-to-noise ratios (SNRs) Open
The role of auditory efferent feedback from the medial olivocochlear system (MOCS) and the middle-ear-muscle (MEM) reflex in tonal detection tasks for humans in the presence of noise is not clearly understood. Past studies have yielded inc…
View article: Normative Performance on the Balance Error Scoring System by Youth, High School, and Collegiate Athletes
Normative Performance on the Balance Error Scoring System by Youth, High School, and Collegiate Athletes Open
Context: Annually, more than 1 million youth athletes in the United States receive or are suspected of receiving a concussion. The Balance Error Scoring System (BESS) is the most commonly used clinical balance evaluation designed to provid…
View article: Duration of vection generated by rotating dot patterns in peripheral correlates with VEP suppression in central visual field
Duration of vection generated by rotating dot patterns in peripheral correlates with VEP suppression in central visual field Open
Exposed to large coherently moving scene can generate illusion of self-motion perception (vection) among stationary viewers. Depending on the susceptibility to visually induced motion sickness (VIMS), the vection experiences can vary. Past…
View article: Interaction Effect of Frequency, Velocity and Amplitude on Perceived Vection Magnitude for Yaw Visual Oscillation
Interaction Effect of Frequency, Velocity and Amplitude on Perceived Vection Magnitude for Yaw Visual Oscillation Open
The phenomenon of vection (also referred to as illusive sensation of self-motion) is commonly perceived by stationary observers when watching coherently moving visual stimuli. For oscillatory visual stimuli, relation of the oscillation fre…
View article: How Does Parametric Reverberation Change the Space of Instrument Emotional Characteristics
How Does Parametric Reverberation Change the Space of Instrument Emotional Characteristics Open
Previous research has shown that the distinctive emotional characteristics in musical instruments can be significantly changed with reverberation. This paper considers whether these changes in character are relatively uniform or instrument…
View article: An Investigation into How Reverberation Effects the Space of Instrument Emotional Characteristics
An Investigation into How Reverberation Effects the Space of Instrument Emotional Characteristics Open
Previous research has shown that musical instruments have distinctive emotional characteristics and that these characteristics can be significantly changed with reverberation. This research examines if the changes in character are relative…
View article: How vertical stripes affect recognition of Chinese characters
How vertical stripes affect recognition of Chinese characters Open
Stripes have been known to cause visual stress (Wilkins and Evans, 2007). The occurrences of stripes in nature often signify the possibility of poison (e.g., venomous snake, centipede) (Cole and Wilkins, 2011). Most alphabets contain verti…