Search Results for author: Ismail Alkhouri

Found 7 papers, 2 papers with code

Improving Efficiency of Diffusion Models via Multi-Stage Framework and Tailored Multi-Decoder Architectures

no code implementations14 Dec 2023 Huijie Zhang, Yifu Lu, Ismail Alkhouri, Saiprasad Ravishankar, Dogyoon Song, Qing Qu

This is due to the necessity of tracking extensive forward and reverse diffusion trajectories, and employing a large model with numerous parameters across multiple timesteps (i. e., noise levels).

Robust MRI Reconstruction by Smoothed Unrolling (SMUG)

1 code implementation12 Dec 2023 Shijun Liang, Van Hoang Minh Nguyen, Jinghan Jia, Ismail Alkhouri, Sijia Liu, Saiprasad Ravishankar

To address this problem, we propose a novel image reconstruction framework, termed Smoothed Unrolling (SMUG), which advances a deep unrolling-based MRI reconstruction model using a randomized smoothing (RS)-based robust learning approach.

Adversarial Defense Image Classification +1

Robust Physics-based Deep MRI Reconstruction Via Diffusion Purification

1 code implementation11 Sep 2023 Ismail Alkhouri, Shijun Liang, Rongrong Wang, Qing Qu, Saiprasad Ravishankar

In particular, we present a robustification strategy that improves the resilience of DL-based MRI reconstruction methods by utilizing pretrained diffusion models as noise purifiers.

Adversarial Defense MRI Reconstruction

On the Robustness of AlphaFold: A COVID-19 Case Study

no code implementations10 Jan 2023 Ismail Alkhouri, Sumit Jha, Andre Beckus, George Atia, Alvaro Velasquez, Rickard Ewetz, Arvind Ramanathan, Susmit Jha

To measure the robustness of the predicted structures, we utilize (i) the root-mean-square deviation (RMSD) and (ii) the Global Distance Test (GDT) similarity measure between the predicted structure of the original sequence and the structure of its adversarially perturbed version.

Protein Folding

Controller Synthesis for Omega-Regular and Steady-State Specifications

no code implementations5 Jun 2021 Alvaro Velasquez, Ismail Alkhouri, Andre Beckus, Ashutosh Trivedi, George Atia

Given a Markov decision process (MDP) and a linear-time ($\omega$-regular or LTL) specification, the controller synthesis problem aims to compute the optimal policy that satisfies the specification.

Steady-State Planning in Expected Reward Multichain MDPs

no code implementations3 Dec 2020 George K. Atia, Andre Beckus, Ismail Alkhouri, Alvaro Velasquez

In this paper, we explore this steady-state planning problem that consists of deriving a decision-making policy for an agent such that constraints on its steady-state behavior are satisfied.

Decision Making

Large-Scale Spectrum Occupancy Learning via Tensor Decomposition and LSTM Networks

no code implementations10 May 2019 Mohsen Joneidi, Ismail Alkhouri, Nazanin Rahnavard

A new paradigm for large-scale spectrum occupancy learning based on long short-term memory (LSTM) recurrent neural networks is proposed.

Computational Efficiency Tensor Decomposition +2

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