Nuzaer Omar

Nuzaer Omar

PhD Candidate at Missouri S&T · Research Intern at Argonne National Laboratory

I build robust and trustworthy ML/LLM systems, with a focus on black-box/zero-access adversarial attacks, LLM security, and unsupervised representation learning.

About Me

ML & LLM Researcher

Hello, I’m Nuzaer Omar, a doctoral student in Computer Science at Missouri University of Science and Technology (Missouri S & T), where I conduct research in the Wireless to Cloud Computing (W2C) Lab under the guidance of Dr. Sanjay Madria. I am currently completing the coursework phase of my PhD program, with an expected graduation date of July 2027.

My research is driven by the goal of building robust, reliable, and trustworthy NLP systems, with a particular focus on large language models (LLMs). I am especially interested in understanding and improving LLM behavior under adversarial and failure prone conditions, including black-box and zero-access attack settings that closely resemble real world deployment scenarios. My work emphasizes not only model accuracy, but also robustness, interpretability, and reproducibility, which I believe are essential for deploying LLM-based systems responsibly.

My interest in machine learning and AI emerged during my undergraduate studies in Electrical and Electronic Engineering at Chittagong University of Engineering & Technology (CUET). For my undergraduate thesis, I worked on the automated detection of cardiovascular diseases from ECG signals, where I combined deep learning and signal processing techniques to design interpretable diagnostic models. This work resulted in highly accurate yet low complexity models and later evolved into multi-class classification systems capable of distinguishing heart attack patients, other cardiac conditions, and healthy individuals. Through this process, I gained early exposure to data centric modeling, feature engineering, and the importance of domain aware interpretation principles that continue to shape my research today.

After completing my undergraduate degree, I joined Port City International University (PCIU), Bangladesh, as a Lecturer in the Department of Electrical & Electronic Engineering. In addition to teaching courses such as programming, electronics, signals and systems, and control systems, I supervised undergraduate student teams and mentored them in idea competitions and applied projects. These teaching and mentoring experiences strengthened my ability to communicate complex technical concepts clearly and reinforced my commitment to research that addresses real-world, human centered problems.

At Missouri S & T, I have continued to broaden my academic and professional engagement beyond core research. I have mentored undergraduate researchers, participated in research translation and commercialization initiatives such as NSF I-CORPS, and contributed to the scholarly community by serving as a peer reviewer for conferences including IEEE BigData and ECAI. These experiences have helped me develop a balanced perspective that bridges theoretical research, system-level implementation, and practical impact.

Looking ahead, my long term objective is to pursue a leadership role in applied research on large language systems, either in academia or in an industrial research environment. I aim to design AI systems that are not only powerful, but also safe, resilient, and aligned with human decision making, particularly in high stakes or uncertain settings. Ultimately, I hope my work will contribute to reducing cognitive burden for practitioners and improving the reliability of AI assisted decision support systems.

Education

  • Aug 2022 – Jul 2027 (expected)
    PhD, Computer Science — Missouri University of Science & Technology
    Advisor: Dr. Sanjay Madria · CGPA: 4.00/4.00
  • 2016 – 2021
    BSc, Electrical & Electronic Engineering — Chittagong University of Engineering & Technology
    CGPA: 3.69/4.00

Employment History

  • Jun 2026 – Present
    Research Intern — Argonne National Laboratory
    Lemont, Illinois, USA

    Conducting research on machine learning and signal-processing methods for gamma-ray source detection, anomaly identification, and robust multimodal modeling.

  • Aug 2022 – Present
    Graduate Research Assistant — Wireless to Cloud Computing Lab, Missouri University of Science & Technology
    Rolla, Missouri, USA · Advisor: Dr. Sanjay Madria

    Conducting research on robust and reliable language models, adversarial attacks and defenses, unsupervised text clustering, representation learning, and computer vision.

  • 2021 – 2022
    Lecturer — Port City International University
    Department of Electrical & Electronic Engineering · Bangladesh

    Taught programming, electronics, control systems, microprocessors, measurement and instrumentation, and related laboratory courses. Supervised student projects and mentored teams in national competitions.

Research Experience

Modular Feedback-Optimized Black-Box LLM Attack Framework

LLM Security · Adversarial NLP · Black-Box Evaluation

  • Designed a training-free black-box adversarial text attack framework integrating masked-language-model substitutions, phonetic perturbations, and pseudo-log-likelihood-ranked candidate selection.
  • Developed an iterative feedback-optimization process that refines adversarial candidates while preserving fluency, perplexity, and semantic similarity.
  • Improved attack success by up to 15% while maintaining semantic similarity above 80%.

Unsupervised Re-labeling and Robustness Enhancement

Unsupervised Learning · Representation Learning · Robust NLP

  • Built an unsupervised pipeline combining Sim-Text keyword attribution, Seq2Seq autoencoding, contrastive representation learning, and KL-divergence-based clustering.
  • Identified and corrected incorrectly labeled neutral samples without requiring additional labeled training data.
  • Improved F1 score by 10% and reduced adversarial attack success by 14% across multiple language-model classifiers.

LLM-Guided Text Clustering

Unsupervised Clustering · LLM Reasoning · Semantic Representation

  • Developed SCALE, a semantic constraint-aware framework for efficient LLM-guided text clustering.
  • Combined lexicon-guided semantic representations with targeted LLM decisions for uncertain samples.
  • Reduced unnecessary LLM inference while preserving the intended category granularity across multiple text-clustering datasets.

Physics-Informed Semantic Attacks on Thermal Object Detectors

Computer Vision · Adversarial ML · Thermal Imaging

  • Developed a physics-informed adversarial framework using class-aware GAN thermal priors, diffusion-guided object perturbations, and distance-aware contextual manipulation.
  • Evaluated the method on the FLIR dataset and the proposed MineThermal dataset.
  • Achieved approximately 76% attack success against YOLOv11 while maintaining perceptual realism, including SSIM of 0.850 and LPIPS of 0.256.
  • Demonstrated transferability across Faster R-CNN, YOLOv11, and RT-DETR.

Gamma-Ray Source and Anomaly Detection

Argonne National Laboratory · Signal Processing · Transformer Models

  • Investigating transformer-based and CNN-transformer architectures for identifying radioactive source presence and isotope categories from gamma-ray spectra.
  • Developing temporal spectrum representations, count-rate features, masked-spectrum pretraining, and source-query decoding methods.
  • Exploring robust anomaly-detection strategies for separating source signatures from changing environmental backgrounds.

Feature-Driven Myocardial Infarction Detection

Biomedical Signal Processing · ECG · Deep Learning

  • Developed a multi-class myocardial infarction detection framework using 21 temporal ECG features extracted from fiducial points.
  • Reduced feature redundancy and addressed class imbalance while achieving an AUC of 99.25% and F1 score of 98.86%.
  • Proposed temporal feature-extraction algorithms for reliable and clinically meaningful cardiovascular-disease classification.

Publications

Conference

  1. Leveraging Pre-Trained Language Models for Realistic Adversarial Attacks
    Nuzaer Omar, Sanjay Madria, Ademola Adesokan
    IEEE International Conference on Big Data, 2025
  2. Detection of Myocardial Infarction from ECG Signal Through Combining CNN and Bi-LSTM
    Nuzaer Omar, M. U., M. Dey
    ICECE, 2020 · DOI: 10.1109/ICECE51571.2020.9393090

Journal

  1. Temporal Feature-Based Classification into Myocardial Infarction and other CVDs Merging CNN and Bi-LSTM from ECG signal
    Nuzaer Omar, M. U., M. Dey
    IEEE Sensors Journal, 2021 · DOI: 10.1109/JSEN.2021.3079241

Projects

Modular Black-Box Adversarial Attack Framework

NLP · LLM Security · Robustness Evaluation

  • Real-time, training-free attack system with MLM perturbations, similarity filters, topic guidance, and phonetics.
  • Designed for practical black-box evaluation settings.

Unsupervised Re-labeling & Robustness Enhancement

Unsupervised Learning · Clustering · Representation Learning

  • Sim-Text keyword attribution + Seq2Seq autoencoding + contrastive learning + KL clustering.
  • Targets noisy labels and robustness in downstream classifiers.

Computer Vision Projects

Detection · Segmentation

  • YOLOv5 object detection on FLIR thermal dataset for low-visibility robustness.
  • Semantic segmentation on CARLA for pixel-level road scene parsing.

More highlights

  • Chess: from-scratch chess with optimized move generation and search.
  • NN from scratch: binary classifier with custom init, gradients, and GD training.

Teaching

Skills

Programming

Python, MATLAB, C/C++, R, Verilog, x86 Assembly

Tools & Frameworks

PyTorch, TensorFlow, Hugging Face, scikit-learn, OpenAttack, Pandas, OpenCV, spaCy, NLTK, Ollama, vLLM

Databases

SQL, MySQL, MongoDB, Redis

Software & Research Tools

LaTeX, Overleaf, Git, Docker, Slurm, GNS3, Proteus, Cadence Virtuoso, PSpice

Machine Learning

CNNs, Autoencoders / VAEs, Contrastive Learning, Representation Learning, YOLOv5 / YOLOv8, Clustering

NLP / LLMs

Transformer Models (BERT, T5, GPT, BART, LLaMA), Adversarial Attacks & Defenses, Prompt Engineering, Decoding Strategies, Semantic Similarity (SBERT), Text Generation, Topic Modeling, Phonetic & Lexical Perturbations

Optimization & Modeling

Loss Design (Contrastive, Reconstruction, Triplet, KL), Hyperparameter Tuning, Model Calibration

Awards & Service

Awards & Programs

  • Kummer Innovation & Entrepreneurship Doctoral Fellows Program (2022–2026)
  • NSF Local I-CORPS, Great Lakes Region (2025)
  • Mentored a PCIU team: Top-20 placement in “Mujib 100 Idea Contest” (2022)

Professional Service

  • Reviewer: ICDM 2025, IEEE Big Data 2024–2025, ECML 2025, etc.

Contact

Email: nom8m@umsystem.edu · nuzaeromar97@gmail.com