A5101885566- Physical Unclonable Functions (PUFs) and Hardware Security
- Integrated Circuits and Semiconductor Failure Analysis
- graph theory and CDMA systems
- Optical Network Technologies
- Advanced MIMO Systems Optimization
- Neuroscience and Neural Engineering
- Coding theory and cryptography
- Semiconductor Lasers and Optical Devices
- Advanced Wireless Communication Techniques
- Advanced Optical Sensing Technologies
- Millimeter-Wave Propagation and Modeling
- Wireless Communication Security Techniques
- Wireless Signal Modulation Classification
- Cell Image Analysis Techniques
- Nanofabrication and Lithography Techniques
- Neural Networks and Reservoir Computing
- Internet Traffic Analysis and Secure E-voting
- Advanced Neural Network Applications
- Sparse and Compressive Sensing Techniques
- Advanced Photonic Communication Systems
- Energy Harvesting in Wireless Networks
- Advanced Optical Imaging Technologies
- Access Control and Trust
- Advanced Image and Video Retrieval Techniques
- Terahertz technology and applications
Johns Hopkins University
2013-2025
Cardiff University
2025
University of Colorado Colorado Springs
2023
Loughborough University
2003
AstraZeneca (United Kingdom)
2003
Public Service Electric and Gas (United States)
1927
Office of the Secretary of Health and Human Services
1927
Tata Power Solar (India)
1927
University of Canterbury
1927
AT&T (United States)
1927
Physical unclonable functions (PUFs) serve as a hardware source of private information that cannot be duplicated and have applications in integrity security. Here we demonstrate photonic PUF based on ultrafast nonlinear optical interactions chaotic silicon micro-cavity. The device is probed with spectrally-encoded ultrashort pulse, which nonlinearly interacts the This interaction produces highly complex unpredictable, yet deterministic, response can unique "fingerprint" cavity for device's...
Abstract This paper introduces the Welsh Advanced Neuroimaging Database (WAND), a multi-scale, multi-modal imaging dataset comprising in vivo brain data from 170 healthy volunteers (aged 18–63 years), including 3 Tesla (3 T) magnetic resonance (MRI) with ultra-strong (300 mT/m) field gradients, structural and functional MRI nuclear spectroscopy at T 7 T, magnetoencephalography (MEG), transcranial stimulation (TMS), together trait questionnaire cognitive data. Data are organised using Brain...
A domain shift exists between the distributions of large scale, outdoor lidar datasets due to being captured using different types sensors, in locations, and under varying weather conditions. Inclement particular affects quality data, adding artifacts such as scattered missed points, leading a drop performance 3D object detection networks trained on standard datasets. Domain adaptation methods seek adapt source-trained neural target domain. Pseudo-label based self training approaches are...
The hallmark of the information age is ease with which stored, accessed, and shared throughout globe. This enabled, in large part, by simplicity duplicating digital without error. Unfortunately, an ever-growing consequence global threat to security privacy enabled our reliance. Specifically, modern secure communications authentication suffer from formidable threats arising potential for copying secret keys stored media. With relatively little transfer information, attacker can impersonate a...
Pseudo-label based self training approaches are a popular method for source-free unsupervised domain adaptation. However, their efficacy depends on the quality of labels generated by source trained model. These may be incorrect with high confidence, rendering thresholding methods ineffective. In order to avoid reinforcing errors caused label noise, we propose an uncertainty-aware mean teacher framework which implicitly filters pseudo-labels during training. Leveraging model uncertainty...
Wireless devices are ubiquitous and consequently the spectrum is congested. Dynamic access becoming more widespread in unlicensed bands as a means to allow secondary users white space licensed bands. Spectrum sensing capabilities cornerstone of dynamic access. In this paper, spectrum-sensing problem transformed into an image recognition machine learning employed distinguish between noise presence signal. An existing Convolutional Neural Network (CNN), AlexNet, repurposed sense for energy...
Line-of-sight (LOS) wireless communication at terahertz (THz) frequency bands is envisioned to play a major role in defining next-generation technologies. This work analyzes the performance of potential point-to-point (P2P) LOS THz system experiencing propagation loss and misaligned antenna beams. The channel particularities are discussed terms deterministic path loss, molecular absorption effect stochastic fading due pointing errors. Considering phase shift keying (PSK) modulation schemes,...
We present a secure communication system constructed using pairs of nonlinear photonic physical unclonable functions (PUFs) that harness chaos in integrated silicon micro-cavities. Compared to large, electronically stored one-time pad, our method provisions large amounts information within the intrinsically complex nanostructure By probing micro-cavity with rapid sequence spectrally-encoded ultrafast optical pulses and measuring lightwave responses, we experimentally demonstrate ability...
Syndrome polynomials produced in a BCH decoder span an ideal multivariate polynomial ring. Because the error locators satisfy every member of ideal, theory is used to find another, more easily solvable system equations having same roots. One such equation (univariate) locator polynomial. The Letter shows how write this one mathematical step from syndrome polynomials.
A novel coherent optical code-division multiple access (OCDMA) scheme is proposed that uses spectral line pairing to generate signals suitable for heterodyne decoding. Both signal and local reference are transmitted via a single fiber simple balanced receiver performs sourceless detection, canceling speckle noise multiple-access interference (MAI). To validate the idea, 16 user fully loaded phase encoded system simulated. Effects of dispersion on performance studied as well. second third...
Compressive sensing channel estimation techniques can be used to exploit the sparse nature of virtual when dimensions are larger than then number physical paths in multipath channel. Through use compressive and recovery we achieve better estimates with fewer pilot resources traditional techniques. We present an analysis stopping criteria using Orthogonal Matching Pursuit (OMP) method estimate a single input output Frequency Division Multiplexed show that under ideal conditions, lower bound...
A novel coherent optical code-division multiple-access (OCDMA) network based on spectral phase coding and polarization diversity balanced reception is proposed. rigorous model of the developed, which shows that efficiencies 1 bps/Hz beyond can be achieved by minimizing interference (MAI) canceling beat noise. While system achieves full capacity under bit synchronism, it also offers competitive performance at up to 25% capacity, even when completely asynchronous. Tree ring configurations...
We demonstrate a cryptographic primitive and authentication system based on the ultrafast response of reverberant integrated photonic cavities formed in silicon, which leverage unpredictability leaky chaotic systems.
We demonstrate that nonlinear silicon photonic Physical Unclonable Functions (PUFs) are resistant to adversarial deep learning attacks. find this resistance is rooted in the optical nonlinearity of PUF token.
Every surgical item used during surgery (e.g., sponges) must be accounted for after to ensure that none of these items is left inside the patient. Despite numerous precautions in place, approximately 1 1500 cases, something gets behind patient's body. This paper presents ASSIST, an automated system instrument and sponge tracking increases safety procedures. ASSIST utilizes RFID (Radio Frequency Identification) technology aid accounting all surgery. The design takes into account safety,...
A phase sensitive receiver for Optical Code Division Multiplexing (OCDMA) waveforms generated by spectral coding (SPC) using and polarization diversity offers expanded system capacity due to low values of multiple access interference (MAI).
We investigate usage of nonlinear wave chaotic amorphous silicon (a-Si) cavities as physically unclonable functions (PUF). Machine learning attacks on integrated electronic PUFs have been demonstrated to be very effective at modeling PUF behavior. Such a-Si photonic are investigated through application algorithms including linear regression, k-nearest neighbor, decision tree ensembles (random forests and gradient boosted trees), deep neural networks (DNNs). found that DNNs performed the best...
We demonstrate an on-chip photonic physical unclonable function using integrated evanescently coupled multimode spiral cavities formed in silicon nitride.
We present a comprehensive ray tracing analysis of novel photonic physical unclonable function (PUF) based upon the ultrafast nonlinear optical interactions in silicon chaotic micro-cavity exploited for secure authentication and communication. The cavity's design exhibits complex behavior that ensures extreme sensitivity to precise structure made unique through fabrication variances. As such, PUF's security is partly ensured by difficultly faced simulating response with significant accuracy....
We present a comprehensive investigation into the complexity of new private key storage apparatus: novel silicon photonic physical unclonable function (PUF) based on ultrafast nonlinear optical interactions in chaotic microcavity that is both and impossible to emulate. This device provides remarkable improvements total information content (raw cryptographic material), density, generation rates over existing scattering PUFs also more easily integrated with CMOS electronics telecommunications...
Spectrally phase-coded optical code division multiple access (OCDMA), demodulated with phase and polarization diversity devices, exhibits high spectral efficiency low Multiple Access Interference (MAI). Use in a passive network (PON) is discussed.
Spectrally phase-coded optical code division multiple access (OCDMA), demodulated with phase and polarization diversity devices, exhibits high spectral efficiency low interference (MAI). Use in a passive network (PON) is discussed.
We present the first experimental demonstration of a practical, fully coherent, optical code division multiple access (OCDMA) scheme that can suppress interference (MAI) and speckle noise without phase locking or thresholding gating. The is sourced from an comb generator uses spectral encoding heterodyne receiver with balanced detection. Here we results for four-user configuration at 50% load. At 4.5 Gbits/s per user, system achieves signal to MAI ratio 648 bit error rate 10(-7).
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text Y. Yang, A. B. Cooper, J. Khurgin, and U. Kang, "Sequences for Impairment Mitigation in Coherent SPE-OCDMA," Advanced Photonics, OSA Technical Digest (CD) (Optica Publishing Group, 2011), paper SPWD6. Export BibTex Endnote (RIS) HTML Plain alert Save article