8 papers · 1 filter
AURORA: Contextual Orthogonalization for Geometric Representation Learning in Healthcare Foundation Models
Yuanyun Zhang, Shi Li
Recent healthcare foundation models have achieved strong predictive performance through large scale self supervised learning, yet their latent representations frequently entangle p…
WISTERIA: Learning Clinical Representations from Noisy Supervision via Multi-View Consistency in Electronic Health Records
Ruan Dong, Yuanyun Zhang, Shi Li
Representation learning in electronic health records (EHR) has largely followed paradigms inherited from natural language processing, relying on sequence modeling and reconstructio…
Event Fields: Learning Latent Event Structure for Waveform Foundation Models
Li Na, Yuanyun Zhang, Shi Li
We propose a new class of waveform foundation models that departs from conventional sequence based representations by modeling physiological time series as realizations of latent e…
Uncertainty-Aware Foundation Models for Clinical Data
Qian Zhou, Yuanyun Zhang, Shi Li
Healthcare foundation models have largely followed paradigms from natural language processing and computer vision, emphasizing large scale pretraining and deterministic representat…
Learning Clinical Representations Under Systematic Distribution Shift
Yuanyun Zhang, Shi Li
Clinical machine learning models are increasingly trained using large scale, multimodal foundation paradigms, yet deployment environments often differ systematically from the data…
Dense Feature Learning via Linear Structure Preservation in Medical Data
Yuanyun Zhang, Mingxuan Zhang, Siyuan Li +4
Deep learning models for medical data are typically trained using task specific objectives that encourage representations to collapse onto a small number of discriminative directio…
Learning Longitudinal Health Representations from EHR and Wearable Data
Yuanyun Zhang, Han Zhou, Li Feng +2
Foundation models trained on electronic health records show strong performance on many clinical prediction tasks but are limited by sparse and irregular documentation. Wearable dev…
ChronoFormer: Time-Aware Transformer Architectures for Structured Clinical Event Modeling
Yuanyun Zhang, Shi Li
The temporal complexity of electronic health record (EHR) data presents significant challenges for predicting clinical outcomes using machine learning. This paper proposes ChronoFo…