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๐Ÿ” robert lewis ๐Ÿ“‚ Engineering
Showing 163 results for "robert lewis" in Engineering
Engineering Preprint PDF DOI

Joint Secrecy and Covert Communication (JSACC): An Enhanced Physical Layer Security Approach

Yanyu Cheng, Haitao Du, Liqin Hu, Wei Yang Bryan Lim, Pan Li ยท 2026

In this paper, we propose an enhanced physical layer security approach, named joint secrecy and covert communication (JSACC), which aims to improve the performance of physical layer security (PLS). Thโ€ฆ

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Engineering Preprint PDF DOI

Hiding Secrets in the CSI Quotient: A Robust Wi-Fi CSI Steganography System

Jiamu Guo, Hailang Jia, Guanxiong Shen, Junqing Zhang, Linning Peng, Liquan Chen ยท 2026

Physical layer (PHY) steganography conceals secrets by making subtle modifications to transmitted radio waveforms, which can be applied to establish covert communication systems. Given the widespread โ€ฆ

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Engineering Preprint PDF DOI

Physics-informed, Generative Adversarial Design of Funicular Shells

Ruben Lourenco, Iciar Alfaro, Beatriz Moya, Elias Cueto ยท 2026

Shell structures are pivotal in the fields of architecture and engineering, due to their aesthetic appeal and structural efficiency. Recently, 3D concrete printing has reignited the interest in these โ€ฆ

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Engineering Preprint PDF DOI

Stealthy Cyber-Attacks on Vehicle Lateral Dynamics: A System-Theoretic Analysis

Ali Eslami, Jiangbo Yu, Mohammad Pirani ยท 2026

This paper studies the vehicle bicycle model under three classes of stealthy cyber-attacks: replay attacks, zero dynamics attacks, and covert attacks. Using a system-theoretic framework, we analyze thโ€ฆ

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Engineering Preprint PDF DOI

Structural Limits of Soft Fusion in Multi-Warden Covert Communication

Abbas Arghavani, Subhrakanti Dey, Anders Ahlen ยท 2026

This paper investigates covert wireless communication with a Fusion Center (FC) that aggregates raw energy measurements from multiple Wardens via soft fusion. Extending our prior work on power-threshoโ€ฆ

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Engineering Preprint PDF DOI

INTERACT: An AI-Driven Extended Reality Framework for Accesible Communication Featuring Real-Time Sign Language Interpretation and Emotion Recognition

Nikolaos D. Tantaroudas, Andrew J. McCracken, Ilias Karachalios, Evangelos Papatheou ยท 2026

Video conferencing has become central to professional collaboration, yet most platforms offer limited support for deaf, hard-of-hearing, and multilingual users. The World Health Organisation estimatesโ€ฆ

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Engineering Preprint PDF DOI

AI-Driven Modular Services for Accessible Multilingual Education in Immersive Extended Reality Settings: Integrating Speech Processing, Translation, and Sign Language Rendering

N.D. Tantaroudas, A.J. McCracken, I. Karachalios, E. Papatheou ยท 2026

This work introduces a modular platform that brings together six AI services, automatic speech recognition via OpenAI Whisper, multilingual translation through Meta NLLB, speech synthesis using AWS Poโ€ฆ

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Engineering Preprint PDF DOI

A Self-Calibrating SDR for High Fidelity Beam- and Null-forming Arrays

Yongjun Kim, Aditya Dhananjay, Sundeep Rangan, Sachin Shetty, C. Nicolas Barati, Michael Zappe, Kimberly Gold, Junil Choi ยท 2026

Null forming is increasingly essential in modern wireless systems for spectrum-sharing, anti-jamming, and covert communications in contested and congested environments. Achieving deep nulls, however, โ€ฆ

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Engineering Preprint PDF DOI

VisG AV-HuBERT: Viseme-Guided AV-HuBERT

Aristeidis Papadopoulos, Rishabh Jain, Naomi Harte ยท 2026

Audio-Visual Speech Recognition (AVSR) systems nowadays integrate Large Language Model (LLM) decoders with transformer-based encoders, achieving state-of-the-art results. However, the relative contribโ€ฆ

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Engineering Preprint PDF DOI

Stacked Intelligent Metasurfaces for Near-Field Multi-User Covert Communications

Ahmed M. Benaya, Ali A. Nasir, Khaled M. Rabie, Daniel B. da Costa ยท 2026

Reconfigurable intelligent surfaces have emerged as a cutting-edge technology for next-generation wireless communications that are capable of reconfiguring the wireless environment using a large numbeโ€ฆ

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Engineering Preprint PDF DOI

Joint Sensing and Covert Communications in RIS-NOMA Systems

Jiayi Lei, Xidong Mu, Tiankui Zhang, Wenjun Xu, Ping Zhang ยท 2026

A reconfigurable intelligent surface (RIS)-assisted non-orthogonal multiple access (NOMA) system is investigated, where the transmitter (Alice) is a dual functional radar communication (DFRC) base staโ€ฆ

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Engineering Preprint PDF DOI

Multi-User Covert Communication in Spatially Heterogeneous Wireless Networks

Jinyoung Lee, Hyeonsik Yeom ยท 2026

This paper investigates an uplink multi-user covert communication system with spatially distributed users. Unlike prior works that approximate channel statistics using averaged parameters and homogeneโ€ฆ

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Engineering Preprint PDF DOI

Crab: Multi Layer Contrastive Supervision to Improve Speech Emotion Recognition Under Both Acted and Natural Speech Condition

Lucas H. Ueda, Joao G. T. Lima, Paula D. P. Costa ยท 2026

Speech Emotion Recognition (SER) in real-world scenarios remains challenging due to severe class imbalance and the prevalence of spontaneous, natural speech. While recent approaches leverage self-supeโ€ฆ

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Engineering Preprint PDF DOI

RF-Fencing: A Novel RIS-Based Service for Proactive Covert Communications

Alexandros I. Papadopoulos, Dimitrios Tyrovolas, Alexandros Pitilakis, Panagiotis D. Diamantoulakis, Antonios Lalas, Konstantinos Votis, Nikolaos V. Kantartzis, Sotiris Ioannidis, Christos Liaskos ยท 2026

Programmable wireless environments (PWEs), empowered by reconfigurable intelligent surfaces (RISes), have emerged as a transformative paradigm for next-generation networks, enabling deterministic contโ€ฆ

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Engineering Preprint PDF DOI

Simultaneous Multi-Modal Covert Communications: Analysis and Optimization

Justin H. Kong, Terrence J. Moore, Fikadu T. Dagefu ยท 2026

This paper investigates the problem of covert communications in a heterogeneous wireless network where multiple communication modalities are used simultaneously. In this setup, a legitimate transmitteโ€ฆ

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Engineering Preprint PDF DOI

Rotatable Antenna Enabled Covert Communication

Qi Dai, Beixiong Zheng, Yanhua Tan, Weidong Mei, Shiqi Gong, Jie Tang, Chengwen Xing ยท 2026

Unlike conventional fixed-antenna architectures, rotatable antenna (RA) has shown great potential in enhancing wireless communication performance by exploiting additional spatial degrees of freedom (Dโ€ฆ

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Engineering Preprint PDF DOI

Extending 2D foundational DINOv3 representations to 3D segmentation of neonatal brain MR images

Annayah Usman, Behraj Khan, Tahir Qasim Syed ยท 2026

Precise volumetric delineation of hippocampal structures is essential for quantifying neurodevelopmental trajectories in pre-term and term infants, where subtle morphological variations may carry progโ€ฆ

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Engineering Preprint PDF DOI

Covert Routing with DSSS Signaling Against Cycle Detectors

Swapnil Saha, Rahul Aggarwal, Fikadu Dagefu, Justin Kong, Jihun Choi, Brian Kim, Predrag Spasojevic ยท 2026

This paper investigates covert multi-hop communication in wireless networks where an adversary employs a cyclostationary (cycle) detector to reveal hidden transmissions. The covert route employs direcโ€ฆ

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Engineering Preprint PDF DOI

H.265/HEVC Video Steganalysis Based on CU Block Structure Gradients and IPM Mapping

Xiang Zhang, Haiyang Xia, Ziwen He, Wenbin Huang, Fei Peng, Zhangjie Fu ยท 2026

Existing H.265/HEVC video steganalysis research mainly focuses on detecting the steganography based on motion vectors, intra prediction modes, and transform coefficients. However, there is currently nโ€ฆ

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Engineering Preprint PDF DOI

Unsupervised Semi-Parametric Plug-in Likelihood-Ratio Detection for Covert Communications in the Presence of Disco Reconfigurable Intelligent Surfaces

Luyao Sun, Huan Huang, Yongxing Song, Zhongxing Tian, Hongliang Zhang, Weidong Mei, Dongdong Zou, Yi Cai ยท 2026

Covert communications, also referred to as low probability of detection (LPD) communications, provide a higher level of privacy protection than cryptography and physical-layer security (PLS) by hidingโ€ฆ

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