Author

Guannan Zhang

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Preprint Sep 2026

From Variational Optimization to Flow-Based Transport: Posterior-Geometry Regularization for Ill-Conditioned Data Assimilation

Variational data assimilation computes a Bayesian update through optimization on a fixed posterior geometry, whose conditioning is determined by the prior covariance and the observation operator. In strongly anisotropic, weakly observed, or highly informative regimes, this geometry can become severely ill conditioned,...

Si-Ming Liang, Feng Bao, Hristo G. Chipilski et al. · 0 citations

#machine learning Preprint Sep 2026

A Pre-trained Variational Autoencoder for Gyrokinetic Plasma Turbulence Surrogate Modeling

Machine learning surrogate models offer a promising path toward accelerating plasma turbulence simulations. We present PreVAE-Turb, a surrogate modeling framework that leverages pre-trained variational autoencoders (VAEs) from the Stable Diffusion image generation model for efficient spatial compression of turbulence f...

Ming-Lei Yang, Marshall Nicholson, D. del-Castillo-Negrete et al. · 0 citations

#generative ai Preprint Sep 2026

Score-Based Generative Data Assimilation for Integrating Aggregated Surveillance Data into Agent-Based Models in Epidemic Tracking

Reliable epidemic monitoring often requires inferring regional infection burden and transmission heterogeneity from noisy, spatially aggregated, and potentially sparse surveillance data. Agent-based models (ABMs) are attractive for this task because they represent individual behavior, contact heterogeneity, and localiz...

Siming Liang, Jacob Hauck, Minglei Yang et al. · 0 citations

#artificial intelligence Apr 2026

Global Attention with Linear Complexity for Exascale Generative Data Assimilation in Earth System Prediction

STORM is introduced, a one-stage generative AI framework that reformulates DA as diffusion-based Bayesian posterior sampling, replacing online PDE ensemble forecasts with scalable AI inference, enabling high-resolution, long-context Earth modeling and demonstrating improved accuracy.

Xiao Wang, Ze-Zhong Zhang, Isaac Lyngaas et al. · arXiv.org · 1 citation