Public Health

Real-Time Video Detection of Falls in Dementia Care Facility and Reduced Emergency Care

Xiong, Glen
Bayen, Eleonore
Nickels, Shirley
Subramaniam, Raghav
2019

An artificial intelligence-enabled video fall detection system using visual science reduced emergency department visits by 80% in 6 communities over 3 months.

Real-Time Estimation of Pollution Emissions and Dispersion from Highway Traffic

Samaranayake, Samitha
Glaser, Steven D.
Holstius, David
Monteil, Julien
Tracton, Ken
Bayen, Alexandre
2014

Traffic-related air pollution is a serious problem with significant health impacts in both urban and suburban environments. Despite an increased realization of the negative impacts of air pollution, assessing individuals' exposure to traffic-related air pollution remains a challenge. Obtaining high-resolution estimates are difficult due to the spatial and temporal variability of emissions, the dependence on local atmospheric conditions, and the lack of monitoring infrastructure. This presents a significant hurdle to identifying pollution concentration hot spots and understanding the...

Mobile Phones and Social Media Empower the Citizen Seismologist

Bray, J.
Dashti, S.
Reilly, J.
Bayen, A.M.
Glaser, S.D.
2014

Emergency responders must "see" the effects of an earthquake clearly and rapidly for effective response. Mobile phone and information technology can be used to measure ground motion intensity parameters and relay that information to emergency responders. However, the phone sensor is an imperfect device and has a limited operational range. Thus, shake table tests were performed to evaluate their reliability as seismic monitoring instruments. Representative handheld devices, either rigidly connected to the table or free to move, measured shaking intensity parameters well. Bias in 5%-damped...

Modeling and Estimation of the Humans' Effect on the CO2 Dynamics Inside a Conference Room

Weekly, Kevin
Bekiaris-Liberis, Nikolaos
Jin, Ming
Bayen, Alexandre M.
2015

We develop a data driven, partial differential equation-ordinary differential equation model that describes the response of the carbon dioxide (CO2) dynamics inside a conference room, due to the presence of humans, or of a user-controlled exogenous source of CO2. We conduct three controlled experiments to develop and tune a model whose output matches the measured output concentration of CO2 inside the room, when known inputs are applied to the model. In the first experiment, a controlled amount of CO2 gas is released inside the room from a regulated supply, and in the second and third...

Reduction in Fall Rate in Dementia Managed Care Through Video Incident Review: Pilot Study

Bayen, Eleonore
Jacquemot, Julien
Netscher, George
Agrawal, Pulkit
Noyce, Lynn Tabb
Bayen, Alexandre
2017

Background: Falls of individuals with dementia are frequent, dangerous, and costly. Early detection and access to the history of a fall is crucial for efficient care and secondary prevention in cognitively impaired individuals. However, most falls remain unwitnessed events. Furthermore, understanding why and how a fall occurred is a challenge. Video capture and secure transmission of real-world falls thus stands as a promising assistive tool. Objective: The objective of this study was to analyze how continuous video monitoring and review of falls of individuals with dementia can support...

Extended, Continuous Measures of Functional Status in Community Dwelling Persons with Alzheimer’s and Related Dementia: Infrastructure, Performance, Tradeoffs, Preliminary Data, and Promise

Zylstra, Bradley
Netscher, George
Jacquemot, Julien
Schaffer, Michael
Shen, Galen
Bayen, Alexandre M.
2018

Background
The past decades have seen phenomenal growth in the availability of inexpensive and powerful personal computing devices. Efforts to leverage these devices to improve health care outcomes promise to remake many aspects of healthcare delivery, but remain in their infancy.
New method
We describe the development of a mobile health platform designed for daily measures of functional status in ambulatory, community dwelling subjects, including those who have Alzheimer’s disease or related neurodegenerative disorders. Using Smartwatches and Smartphones we measure subject...

Building-in-Briefcase: A Rapidly-Deployable Environmental Sensor Suite for the Smart Building

Weekly, Kevin
Jin, Ming
Zou, Han
Hsu, Christopher
Soyza, Chris
Bayen, Alexandre M.
Spanos, Costas
2018

A building’s environment has profound influence on occupant comfort and health. Continuous monitoring of building occupancy and environment is essential to fault detection, intelligent control, and building commissioning. Though many solutions for environmental measuring based on wireless sensor networks exist, they are not easily accessible to households and building owners who may lack time or technical expertise needed to set up a system and get quick and detailed overview of environmental conditions. Building-in-Briefcase (BiB) is a portable sensor network platform that is trivially...

Long-Term Digital Device-Enabled Monitoring of Functional Status: Implications for Management of Persons with Alzheimer's Disease

Manley, Natalie A.
Bayen, Eleonore
Braley, Tamara L.
Merrilees, Jennifer
Clark, Amy M.
Zylstra, Bradley
Schaffer, Michael
Bayen, Alexandre
Possin, Katherine L.
2020

Introduction Informal caregiving is an essential element of health-care delivery. Little data describes how caregivers structure care recipients’ lives and impact their functional status. Methods We performed observational studies of community dwelling persons with dementia (PWD) to measure functional status by simultaneous assessment of physical activity (PA) and lifespace (LS). We present data from two caregiver/care-recipient dyads representing higher and average degrees of caregiver involvement. Results We acquired >42,800 (subject 1); >41,300 (subject 2) PA data points and >...

Health of California’s Loop Detector System

Rajagopal, Ram
Varaiya, Pravin
2007

The California Department of Transportation (Caltrans) freeway sensor network has two components: the sensor system of 25,000 inductive loop sensors grouped into 8,000 vehicle detector stations (VDS) and covering 30,500 freeway direction-miles; and the communication network over which the sensor measurements are transported to Caltrans Traffic Management Centers. The sensor network is virtually the only source of data for use in traffic operations, performance measurement, planning and traveler information. However, the value of these data is greatly reduced by the poor reliability of the...

Enfoque en Epidemiología de Campo

FOCUS, G de Trabajo
Nelson, A
Mountcastle, SB
Cáceres, DD
Rodriguez, D
2002

La decisión de investigar una epidemia puede estar determinada por varios factores importantes. La limitaciones de recursos financieros y humanos o personal experto pueden impedir hacer investigaciones; aunque estas limitaciones no siempre son insuperables. Existen oportunidades de entrenamiento y asistencia en investigaciones de epidemias, disponibles, por parte de diferentes agencias estatales y federales, como el CDC (Centers for Disease Control and Prevention, Centros de Control de Enfermedades y Prevención de los Estados Unidos). Aunque los costos directos de una investigación...