zwu76@jhu.edu

ECE Department
Johns Hopkins University

Publications

• AniRes2D: Anisotropic Residual-enhanced diffusion for 2D MR super-resolution
  Authors: Zejun Wu, Samuel W. Remedios, Blake E. Dewey, Aaron Carass, and Jerry L. Prince
  Conference: SPIE Medical Imaging - Clinical and Biomedical Imaging
  Meeting Dates: 18 - 22 February 2024
  Description: Anisotropic low-resolution (LR) magnetic resonance (MR) images are fast to obtain but hinder automated processing. We propose to use denoising diffusion probabilistic models (DDPMs) to super-resolve these 2D-acquired LR MR slices. This paper introduces AniRes2D, a novel approach combining DDPM with a residual prediction for 2D super-resolution (SR). Results demonstrate that AniRes2D outperforms several other DDPM-based models in quantitative metrics, visual quality and domain adaptation ability. Furthermore, we explored the use of noise conditioning augmentation (NCA) as an alternative augmentation technique for DDPM-based SR models, but it was found to reduce performance. Our findings contribute valuable insights to the application of DDPMs for SR of anisotropic MR images.

• BRNN-GAN: generative adversarial networks with bi-directional recurrent neural networks for multivariate time series imputation
  Authors: Zejun Wu, Chao Ma, Xiaochuan Shi, Libing Wu, Dian Zhang, Yutian Tang, and Milos Stojmenovic
  Conference: 2021 IEEE 27th International Conference on Parallel and Distributed Systems (ICPADS)
  Year: 2021
• Imputing missing indoor air quality data with inverse mapping generative adversarial network
  Authors: Zejun Wu, Chao Ma, Xiaochuan Shi, Libing Wu, Yi Dong, and Milos Stojmenovic
  Journal: Building and Environment
  Year: 2022