6 papers
Fractional elementary symmetric functions and Hessian estimates in the plane
Gautam Neelakantan Memana, Neil S. Trudinger, Po-Lam Yung
We prove an endpoint Pucci maximum principle for domains in , formulated using a generalization of elementary symmetric polynomials to noninteger orders. As a result,…
Sedentary Behavior Classification for Wearable Sensors with a CNN-BiLSTM Model
Yuliang Chen, Weiwei Shi, Jingjing Zou +10
Accurate detection of sedentary behavior is important for studying health risks related to prolonged sitting, but posture-based classification remains challenging with wearable sen…
Modeling Physical Activity Change as Smooth Transformations: Temporal and Amplitude Patterns Associated with Physical Function in Older Women
Rong W. Zablocki, Steve Nguyen, Yacun Wang +11
Purpose: To investigate whether longitudinal changes in timing and magnitude of PA are associated with physical function (PF) in older women. Methods: Women from OPACH study with a…
MoCA: Multi-modal Cross-masked Autoencoder for Time Series in Digital Health
Howon Ryu, Yuliang Chen, Yacun Wang +5
Wearable devices enable continuous multi-modal physiological and behavioral monitoring, yet analysis of these data streams faces fundamental challenges including the lack of gold-s…
A doubly robust estimator for the Mann Whitney Wilcoxon Rank Sum Test when applied for causal inference in observational studies
Ruohui Chen, Tuo Lin, Lin Liu +8
The Mann-Whitney-Wilcoxon rank sum test (MWWRST) is a widely used method for comparing two treatment groups in randomized control trials, particularly when dealing with highly skew…
A linear mixed model approach for measurement error adjustment: applications to sedentary behavior assessment from wearable devices
Ruohui Chen, Dori Rosenberg, Chongzhi Di +6
In recent years, wearable devices have become more common to capture a wide range of health behaviors, especially for physical activity and sedentary behavior. These sensor-based m…