Curriculum Vitae

Professional Experience

CTO (part-time)

01/2026 – Present

PlesmoSense, Sousse, Tunisia

Defining the company biosensing technology stack and vision for remote physiological monitoring products and consulting services.

Lead Applied Scientist

07/2019 – 11/2025

Centan Inc., Tokyo, Japan

Specialized in DSP and signal processing for remote and wearable biometric acquisition and interpretation. Led the full technical stack from experiment design through biometric extraction to validation, with a deep focus on the signal processing pipeline. Architected end-to-end rPPG and non-contact biometric systems covering optical signal extraction, real-time processing, and vital-sign estimation. Developed ML models for physiological parameter estimation: blood pressure, heart rate, HRV, and derived biometrics. Implemented advanced DSP algorithms (EMD, VMD, adaptive filtering, PPG waveform restoration) for robust physiological signal recovery under real-world conditions.

Senior Researcher

11/2017 – 06/2019

Centan Inc., Tokyo, Japan

Focused on EEG and ECG denoising algorithms and DSP for biosignal quality enhancement. Led the development of blind source separation and adaptive filtering pipelines (ICA, PCA, wavelet thresholding) to isolate and clean physiological signals from noisy recordings. Built reusable DSP modules adopted in production workflows.

Postdoctoral Researcher

05/2016 – 03/2017

University of Electro-Communications, Tokyo, Japan

Investigated thermal-resilient photonic Network-on-Chip architectures for many-core systems. Designed and evaluated non-blocking photonic switching mechanisms for high-throughput interconnects.

Teaching Experience

Invited Lecturer

07/2017

National School of Engineering of Tunis (ENIT), Tunisia

Delivered a specialized lecture series on Advanced Interconnection Networks (On-Chip and Off-Chip Systems), connecting theoretical NoC design concepts with real-world high-performance computing architectures.

Teaching Assistant & Lab Instructor

2011 – 2016

University of Aizu, Graduate School of Computer Science and Engineering, Japan

Conducted laboratory sessions in Computer Architecture, Embedded Systems & Digital Logic Design, Information Theory, Mathematical Logic & Applied Geometry, and Java Programming. Guided students in programming assignments and hardware design exercises. Assisted in course preparation, grading, and student mentoring. Delivered lectures as substitute instructor when required.

Research Interests

  • Multimodal physiological sensing and signal processing for non-contact and wearable monitoring.
  • Trustworthy and explainable machine learning (XAI) for biomedical systems: interpretable and robust models for physiological parameter estimation.
  • Computationally efficient biomedical AI: scalable, real-time algorithms for clinical and edge-computing deployment.

Teaching Interests

Graduate:
  • Biomedical Signal Processing
  • Biomedical Image and Video Processing
  • Computational Imaging for Physiological Sensing
  • Embedded Systems & IoT for Wearable Devices
Undergraduate:
  • Signals and Systems
  • Introduction to Digital Signal Processing
  • Introduction to Biosensors

Technical Skills

PythonNumPySciPyPandasMATLABOpenCVMediaPipescikit-learnPyTorchPyCaretOptunaDSPWaveletEMD/VMDICA/PCAAdaptive FilteringTime-SeriesrPPGComputer VisionC++FastAPIStreamlitPySide6DockerGitCI/CDJetsonRaspberry PiLLM Fine-TuningRAGSLMEmbedded Systems

Education

Ph.D. in Computer Science and Engineering2013 – 2016

University of Aizu, Japan

M.Sc. in Computer Engineering2011 – 2013

University of Aizu, Japan

B.Sc. in Physics2004 – 2008

Faculty of Sciences of Sfax, Tunisia

Languages

Arabic (Native)English (Fluent)French (Fluent)Japanese (Intermediate)

Publications

Journal Articles

  1. A. Ben Ahmed, "Spatial Artifact Coherence Determines Codec Robustness in Patch-Based rPPG," submitted to IEEE Trans. Biomedical Engineering, 2026. [arXiv:2606.04198]
  2. A. Ben Ahmed, "Template Collapse and Information-Theoretic Limits in Camera rPPG Pulse Morphology Restoration," submitted to IEEE J. Biomedical and Health Informatics, 2026. [arXiv:2606.03802]
  3. Z. Wang, Y. Liang, A. Ben Ahmed, et al., "Edge-Driven Dynamic Two-Tier Blockchain for Energy Trading in Vehicle-To-Grid Networks," IEEE Trans. Vehicular Technology, 2025.
  4. A. Ben Ahmed et al., "Scalable Photonic Networks-on-Chip Architecture Based on a Novel Wavelength-Shifting Mechanism," IEEE Trans. Emerging Topics in Computing, vol. 8, no. 2, 2017.
  5. A. Ben Ahmed and A. Ben Abdallah, "An Energy-Efficient High-Throughput Mesh-Based Photonic On-Chip Interconnect," Photonics, vol. 3, no. 2, 2016.
  6. A. Ben Ahmed and A. Ben Abdallah, "Hybrid Silicon-photonic NoC for Future Generations of High-performance Many-core Systems," J. Supercomputing, vol. 71, no. 12, 2015.
  7. A. Ben Ahmed and A. Ben Abdallah, "Architecture and Design of Real-Time System for Elderly Health Monitoring," Int. J. Embedded Systems, vol. 9, no. 5, 2017.

Conference Papers

  1. A. Ben Ahmed et al., "Hybrid Photonic NoC Based on Non-blocking Photonic Switch and Light-weight Electronic Router," IEEE SMC, Hong Kong, 2015.
  2. A. Ben Ahmed et al., "Contention-free Routing for Hybrid Photonic Mesh-based Network-on-Chip Systems," IEEE MCSoC, Torino, 2015.
  3. A. Ben Ahmed et al., "Non-blocking Electro-optic NoC Router for High-throughput and Low-power Many-core Systems," WCITCA, Hammamet, 2015.
  4. A. Ben Ahmed et al., "Efficient Router Architecture, Design and Performance Exploration for Many-core Hybrid Photonic NoC," IEEE ICISC, 2015.
  5. A. Ben Ahmed and A. Ben Abdallah, "PHENIC: Towards Photonic 3D-NoC Architecture," IEEE STA, Sousse, 2013.
  6. A. Ben Ahmed and A. Ben Abdallah, "Hardware/Software Prototyping of Dependable Real-Time System for Elderly Health Monitoring," IEEE ICMAES, Sousse, 2013.
  7. A. Ben Ahmed et al., "Towards Smart Health Monitoring System for Elderly People," IEEE iCAST, Seoul, 2012.