Derek Abbott

Derek Abbott
University of Adelaide · School of Electrical and Electronic Engineering

PhD

About

1,114
Publications
881,115
Reads
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22,033
Citations
Introduction
http://scholar.google.com.au/citations?user=vqD_0uQAAAAJ Derek Abbott is a full professor of Electrical and Electronic Engineering at the University of Adelaide, Australia. He is a Fellow of the IEEE. His interests are in the exploitation of multidisciplinary engineering and physics in the areas of complex systems, photonics, and biomedicine. He is also interested in energy policy.
Additional affiliations
January 1987 - present
University of Adelaide
Position
  • Professor (Full)
January 1986 - January 1987
Austek MIcrosystems
Position
  • VLSI Analog Design Engineer
January 1978 - January 1986
GEC Hirst Research Centre
Position
  • Engineer
Education
January 1989 - January 1997
University of Adelaide
Field of study
  • Electrical & Electronic Engineering
January 1979 - January 1982
Loughborough University
Field of study
  • Physics

Publications

Publications (1,114)
Article
Full-text available
The nature of the relationship between mathematics and the physical world has been a source of debate since the era of the Pythagoreans. A school of thought, reflecting the ideas of Plato, is that mathematics has its own existence. Flowing from this position is the notion that mathematical forms underpin the physical universe and are out there wait...
Article
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Could nuclear power be rapidly expanded on a global scale? There are a number of practical limiting factors, including site availability and acceptability, nuclear waste disposal issues, and the risks of accidents and proliferation. But there are also a variety of resource limitations. One particular resource limitation that has not been clearly ar...
Article
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Metamaterials are artificial composites that acquire their electromagnetic properties from embedded subwavelength metallic structures. In theory, the effective electromagnetic properties of metamaterials at any frequency can be engineered to take on arbitrary values, including those not appearing in nature. As a result, this new class of materials...
Article
In 2008, researchers at HP Labs published a paper in {\it Nature} reporting the realisation of a new basic circuit element that completes the missing link between charge and flux-linkage, which was postulated by Leon Chua in 1971. The HP memristor is based on a nanometer scale TiO$_2$ thin-film, containing a doped region and an undoped region. Furt...
Article
In a game of chess, pieces can sometimes be sacrificed in order to win the overall game. Similarly, engineers know that two unstable systems, if combined in the right way, can paradoxically become stable. But can two losing gambling games be set up such that, when they are played one after the other, they becoming winning? The answer is yes. This i...
Article
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A high-performance electro-absorption optical modulator based on the epsilon-near-zero (ENZ) effect is proposed. The structure consists of a waveguide with a silicon (Si) core over which a stack of graphene/HfO2/graphene/ITO/HfO2/graphene is grown, covered by a Si cladding. An external voltage is applied across the graphene layers to change the car...
Preprint
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Deep learning models have been shown to be vulnerable to recent backdoor attacks. A backdoored model behaves normally for inputs containing no attacker-secretly-chosen trigger and maliciously for inputs with the trigger. To date, backdoor attacks and countermeasures mainly focus on image classification tasks. And most of them are implemented in the...
Conference Paper
Photovoltaic energy from renewable sources is becoming more prevalent nowadays, as part of the process of converting this energy to AC voltage and feeding it into the power grid network, the output voltage or injected current total harmonic distortion (THD) should be low, usually below 5 %. This unwanted distortion can lead to increased current in...
Preprint
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A backdoor deep learning (DL) model behaves normally upon clean inputs but misbehaves upon trigger inputs as the backdoor attacker desires, posing severe consequences to DL model deployments. State-of-the-art defenses are either limited to specific backdoor attacks (source-agnostic attacks) or non-user-friendly in that machine learning (ML) experti...
Article
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Amid the search for efficient terahertz transmission and gas sensing, all-polymer terahertz waveguides attract significant interest due to their compactness and capability for providing environmentally robust systems. The high loss within metals and dielectrics in the terahertz range makes it challenging to build a low loss, mechanically stable, an...
Article
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Using the non-causal nature of a fractional-order singular (FOS) model, this paper deals with the modification of an estimation algorithm developed in [1] and demonstrates how the derived estimation procedure can be adjusted by additional information related to the future dynamics. The procedure adopts the maximum likelihood (ML) method leading to...
Conference Paper
Optical resonators are of significant interest due to their strong light confinement ability. However, the resonator performance is often limited by the out-of-plane scattering caused by fabrication defects. A physical mechanism known as bound states in the continuum can potentially suppress the scattering, leading to improved optical devices. Usin...
Preprint
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There is currently a burgeoning demand for deploying deep learning (DL) models on ubiquitous edge Internet of Things devices attributing to their low latency and high privacy preservation. However, DL models are often large in size and require large-scale computation, which prevents them from being placed directly onto IoT devices where resources a...
Article
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The reversible insulating-to-conducting phase transition (ICPT) of vanadium dioxide (VO 2 ) makes it a versatile candidate for the implementation of integrated optical devices. In this paper, a bi-functional in-line optical device based on a four-layer stack of PMMA/graphene/VO 2 /graphene deposited on a side-polished fiber (SPF) is proposed. The s...
Article
Despite the wide range of applications and versatility, actively Q-switched fiber lasers (AQS-FLs) suffer from the multi-peak phenomenon or stepwise pulse generation under certain conditions. As such, the advantage of the stepwise tendency in AQS-FL to modify the pulse shape and create a temporal profile that minimizes the power of stimulated Brill...
Conference Paper
Subaperture Topography and Aperture (SATA) dependent azimuthal motion compensation (MOCO) can yield satisfactory target focusing at slow to moderate track deviations. However, at faster track deviations, the algorithm has to make a trade-off between handling higher motion error frequency and finer instantaneous squint angles. Subaperture selection...
Preprint
Though deep neural network models exhibit outstanding performance for various applications, their large model size and extensive floating-point operations render deployment on mobile computing platforms a major challenge, and, in particular, on Internet of Things devices. One appealing solution is model quantization that reduces the model size and...
Article
Over the last decade, dc-dc power converters have attracted significant attention due to their increased use in a number of applications from aerospace to renewable energy. The interest in wide bandgap (WBG) power semiconductor devices stems from outstanding features of WBG materials, power device operation at higher temperatures, larger breakdown...
Article
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Cardiovascular diseases continue to be a significant global health threat. The electrocardiogram (ECG) signal is a physiological signal that plays a major role in preventing severe and even fatal heart diseases. The purpose of this research is to explore a simple mathematical feature transformation that could be applied to ECG signal segments in or...
Article
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Hypertension affects an estimated 1.4 billion people and is a major cause of morbidity and mortality worldwide. Early diagnosis and intervention can potentially decrease cardiovascular events later in life. However, blood pressure (BP) measurements take time and require training for health care professionals. The measurements are also inconvenient...
Article
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A hollow core antiresonant photonic crystal fiber (HC-ARPCF) is analyzed for terahertz applications. A numerical analysis of the proposed fiber is first carried out to minimize coupling between the core and cladding modes. The modeling of the scaled-up and inhibited coupling fiber is carried out by means of a Finite Element Method (FEM), which is t...
Article
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We propose and numerically analyze various hollow-core antiresonant fiber (HC-ARF) for operation at terahertz frequencies. We compare typical HC-ARF designs with nested and adjacent nested designs while analyzing performance in terms of loss and single-mode guidance of terahertz waves. With optimized fiber dimensions, the fundamental core mode, cla...
Article
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Si3N4 has emerged as a prominent material for expanding the capability of silicon photonics to wavelengths below < 1 μm. However, realizing an efficient optical modulator, a key building block for any integrated optics platform, remains a major challenge in Si3N4 mainly because this material has a vanishing Pockels coefficient. Here, we propose a...
Article
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The optical properties of polymers and glasses useful for terahertz applications are experimentally characterized using terahertz time-domain spectroscopy (THz-TDS). A standard system setup utilizing transmission spectroscopy is used to measure different optical properties of materials including refractive index, relative permittivity, loss tangent...
Article
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Lying between optical and microwave ranges, the terahertz band in the electromagnetic spectrum is attracting increased attention. Optical fibers are essential for developing the full potential of complex terahertz systems. In this manuscript, we review the optimal materials, the guiding mechanisms, the fabrication methodologies, the characterizatio...
Article
For ac electricity grids, the aim has always been at low-cost and disruption-proof solutions. The power grid is inherently vulnerable to environmental disturbances. However, the introduction of power electronics (PEs) and changes in load and generator characteristics have introduced a game changer at an unprecedented pace over the last decade. Duri...
Article
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Elevated blood pressure (BP) is a major cause of death, yet hypertension commonly goes undetected. Owing to its nature, it is typically asymptomatic until later in its progression when the vessel or organ structure has already been compromised. Therefore, noninvasive and continuous BP measurement methods are needed to ensure appropriate diagnosis a...
Article
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In this paper, a simple, fast, and novel method for designing a tunable terahertz absorber with arbitrary central frequency and desired fractional bandwidth is presented. The proposed absorber consists of a single layer periodic array of graphene ribbons (PAGRs), placed a quarter wavelength from a metallic ground, separated by a dielectric material...
Article
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Silicon photonic platforms are of significant interest for a variety of applications that 56 in the mid-infrared regime. However, the realization of efficient mid-IR modulators, key components in any integrated optics platform, is still a challenging topic. Here, an ultra compact high-speed hybrid Si/VO2 modulator operating at a mid-IR wavelength o...
Article
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One in three adults worldwide has hypertension, which is associated with significant morbidity and mortality. Consequently, there is a global demand for continuous and non-invasive blood pressure (BP) measurements that are convenient, easy to use, and more accurate than the currently available methods for detecting hypertension. This could easily b...
Article
We propose a plasmon induced tunable metasurface for multiband superabsorption and terahertz sensing. It consists of a graphene sheet that facilitates perfect absorption where the graphene pattern at the top layer creates an~enhanced evanescent wave that facilitates the metasurface to work as a sensor. The modelling and numerical analysis are carri...
Article
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A hollow core antiresonant photonic crystal fiber (HC-ARPCF) with metal inclusions is numerically analyzed for transmission of terahertz (THz) waves. The propagation of fundamental and higher order modes are investigated and the results are compared with conventional dielectric antiresonant (AR) fiber designs. Simulation results show that broadband...
Article
The development of a bio-inspired image sensor that can match the functionality of the vertebrate retina in terms of image resolution, power dissipation and dynamic resolution demands an extremely challenging standard in terms of efficiency and performance [1]–[4]. At present, functional biological image processing possesses extremely high temporal...
Article
A physical unclonable function (PUF) is a device that exploits inherent randomness introduced during manufacturing to give a physical entity a unique ‘fingerprint’ or trust anchor. These devices are .of potential use in a variety of applications from anti-counterfeiting, identification, authentication and key generation to advanced protocols such a...
Article
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This paper presents a comparative study of discrete proportional integral (PI) and proportional resonant (PR) current control for single-phase uninterruptible power supply (UPS) inverters. There is an increasing requirement for current and voltage-controlled UPS inverters with very low or zero steady-state error, improved transient response and low...
Article
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Many physical systems can be adequately modelled using asecond-order approximation. Thus, the problem of systemidentification often reduces to the problem of estimating theposition of a single pair of complex–conjugate poles. Thispaper presents a convenient but approximate technique forthe estimation of the position of a single pair of complex–conj...
Article
Full-text available
Hypertension is one of the most prevalent diseases and is often called the “silent killer” because there are usually no early symptoms. Hypertension is also associated with multiple morbidities, including chronic kidney disease and cardiovascular disease. Early detection and intervention are therefore important. The current routine method for diagn...
Article
We investigate the stochastic resonance phenomenon in a discrete Hopfield neural network for transmitting binary amplitude modulated signals, wherein the binary information is represented by two stored patterns. Based on the potential energy function and the input binary signal amplitude, the observed stochastic resonance phenomena involve two gene...
Article
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Game theory is an established branch of mathematics that offers a rich set of mathematical tools for multi-person strategic decision making that can be used to model the interactions of decision makers in security problems who compete for limited and shared resources. This article presents a review of the literature in the area of game theoretical...
Article
Artificial intelligence (AI) is becoming a vital concept in medicine leading to a rapid emergence of important tools for medical diagnostics. Now, as a crucial machine learning tool in the field of computer vision, deep learning (DL) is being widely used in medical imaging. Furthermore, as reported in the medical literature, DL has been widely used...
Article
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We propose and numerically characterize an exposed core photonic crystal fiber (PCF) for biosensing applications. Surface plasmons are excited within gold (\rm Au) strips and titanium dioxide ($\rm TiO_2$) is employed to support adhesion of $\rm Au$ with glass. In consideration of ease of fabrication, only four air holes are used to simplify the se...
Article
Full-text available
The measurement of blood pressure (BP) is critical to the treatment and management of many medical conditions. High blood pressure is associated with many chronic disease conditions, and is a major source of mortality and morbidity around the world. For outpatient care as well as general health monitoring, there is great interest in being able to a...
Article
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The truel is a three person competition that generalises the classic duel. In this game three players try to eliminate each other in a series of one-to-one duels until there is only one survivor. The players’ marksmanship, shooting order and strategies for choosing a target play a significant role in individual’s survival probability. Strategies su...
Article
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In this work, a simple, miniature, and highly sensitive photonic crystal fiber (PCF) based surface plasmon resonance (SPR) sensor is proposed. The target analyte and the plasmonic material are at the outer surface of the fiber making practical applications feasible. A $30$~nm gold (Au) layer supports surface plasmons. A thin titanium dioxide (TiO$_...
Conference Paper
Full-text available
We propose a plasmon induced graphene metasurface for terahertz absorption and sensing. The modelling and numerical analysis are carried out using CST microwave studio and a genetic algorithm (GA) is used to optimize the parameters. The metasurface is tunable by means of changing the graphene applied gate voltage. By tuning and exploiting its prope...