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Articles 1 - 30 of 35
Full-Text Articles in Engineering
Magneto-Optical Visualisation For High-Resolution Forensic Data Recovery Using Advanced Thin Film Nano-Materials, M Nur-E-Alam, Mikhail Vasiliev, Kamal Alameh, Craig Valli
Magneto-Optical Visualisation For High-Resolution Forensic Data Recovery Using Advanced Thin Film Nano-Materials, M Nur-E-Alam, Mikhail Vasiliev, Kamal Alameh, Craig Valli
International Cyber Resilience conference
We develop and characterise new high-performance nano-engineered magneto-optic materials for use in laser-microscopy- based magnetic field visualisers featuring high sensitivity and resolution, low cost and small size. This type of visualisers will make it possible for forensic experts to recover erased data previously stored in high- and ultrahigh-density magnetic disks and hard disk drives.
Opto-Vlsi-Based Tunable Linear-Cavity Fibre Laser, David Michel, Feng Xiao, Kamal Alameh
Opto-Vlsi-Based Tunable Linear-Cavity Fibre Laser, David Michel, Feng Xiao, Kamal Alameh
Research outputs pre 2011
A novel approach using an Opto-VLSI processor to achieve a tunable fibre laser is presented. The Opto-VLSI based fibre laser is able to tune wavelengths and maintain a high Side-Mode Suppression Ratio (SMSR) even when the output optical power is low. Experimental results show a continuously tunable fibre laser source with a tuning range as high as 30 nm and a SMSR exceeding 30 dB.
Pspice Simulation Of An Electro-Acoustic Communications Channel, Graham Wild, Steven Hinckley
Pspice Simulation Of An Electro-Acoustic Communications Channel, Graham Wild, Steven Hinckley
Research outputs pre 2011
In this paper, we present results from a circuit simulation of a proposed electro-acoustic communications channel. The communications channel was modeled in PSpice using Redwood's version of Mason's equivalent circuit. The simulations used binary phase shift keyed communications signals with a carrier frequency of 1.12 MHz. Results obtained from the model are comparable with the results obtained experimentally. The frequency response of the model matched the measured frequency response, predicting lower frequency resonances obtained in the experimental data. The transient response of the model compares almost identically with the transient response observed experimentally. This is a significant characteristic as the …
Wireless Acoustic Communications And Power Supply For In-Vivo Biomedical Devices, Graham Wild, Steven Hinckley
Wireless Acoustic Communications And Power Supply For In-Vivo Biomedical Devices, Graham Wild, Steven Hinckley
Research outputs pre 2011
Pacemakers are common biomedical devices used in the treatment of specific cardiovascular problems. Current research in biomedical engineering is investigating the use of so called brain pacemakers to regulate conditions such as Parkinson's and other neurological conditions. In this paper, we demonstrate the principle of acoustic communications and power harvesting, in vivo. The signals are intended to be used for fixed in vivo biomedical devices, such as pacemakers, were wired and wireless RF communications cannot be used. Results show the performance of the communications channel. The frequency response, transfer function and transient response (at resonance) of the communications channel were …
Effect Of A Polywell Geometry On A Cmos Photodiode Array, Paul V. Jansz, Steven Hinckley, Graham Wild
Effect Of A Polywell Geometry On A Cmos Photodiode Array, Paul V. Jansz, Steven Hinckley, Graham Wild
Research outputs pre 2011
The effect of a polywell geometry hybridized with a stacked gradient poly-homojunction architecture, on the response of a CMOs compatible photodiode array was simulated. Crosstalk and sensitivity improved compared to the polywell geometry alone, for both back and front illumination
Technological Challenges Of 1-Dimensional Magnetic Photonic Crystals, Mikhail Vasiliev, Kamal Alameh, Dmitry E. Balabanov, Vladimir I. Burkov, V. V. Koledov, Viacheslav A. Kotov, V. G. Shavrov, Anotoly K. Zvezdin
Technological Challenges Of 1-Dimensional Magnetic Photonic Crystals, Mikhail Vasiliev, Kamal Alameh, Dmitry E. Balabanov, Vladimir I. Burkov, V. V. Koledov, Viacheslav A. Kotov, V. G. Shavrov, Anotoly K. Zvezdin
Research outputs pre 2011
Visible-region magnetic photonic crystals (MPC) designed for higher-order bandgap operation have been proposed to overcome the technological restrictions originating from the strong thickness dependency of the individual magnetic layer properties observed in MPC structures.
Design Of Functionally Graded Carbon Coatings Against Contact Damage, Rajnish K. Singh, Zhifeng Zhou, Lawrence Kwok Yan Li, Paul Munroe, Mark Hoffman, Zonghan Xie
Design Of Functionally Graded Carbon Coatings Against Contact Damage, Rajnish K. Singh, Zhifeng Zhou, Lawrence Kwok Yan Li, Paul Munroe, Mark Hoffman, Zonghan Xie
Research outputs pre 2011
Three different functionally graded amorphous carbon (a-C) thin films were deposited on to aluminium substrates using a closed-field unbalanced magnetron sputtering ion plating method. The closed-field configuration prohibits the loss of secondary electrons and consequently enhances the plasma density significantly. The functional gradient of the a-C films was achieved by varying the bias voltage linearly during deposition. Three graded a-C systems possessing different variations in Young's modulus were deposited with the highest Young's modulus at the (i) top surface, (ii) interface or (iii) middle of the film. Of the three systems investigated, the one with the highest Young's modulus at …
A 1x2 Adaptive Optical Splitter Based On Opto-Vlsi Processor, Haithem Mustafa, Feng Xiao, Kamal Alameh
A 1x2 Adaptive Optical Splitter Based On Opto-Vlsi Processor, Haithem Mustafa, Feng Xiao, Kamal Alameh
Research outputs pre 2011
A 1×2 adaptive optical splitter structure is proposed and experimentally demonstrated. The 1×2 adaptive optical splitter structure is based on Opto-VLSI in conjunction with 4-f imaging system. An Opto-VLSI processor is software driven and capable of splitting an optical beam into different directions when a multicasting phase hologram is uploaded. An input optical signal launched into an input optical fiber port is split and coupled into two output optical fiber ports with arbitrary splitting ratios over a wavelength range exceeding 50 nm.
Photovoltaic Micro-Cell Design For Distrubuted Power In Sensor Networks, Gary A. Allwood, Graham Wild, Steven Hinckley
Photovoltaic Micro-Cell Design For Distrubuted Power In Sensor Networks, Gary A. Allwood, Graham Wild, Steven Hinckley
Research outputs pre 2011
We present a new study of power over optical fiber, for use in optical fiber smart sensor networks, using silicon-based photovoltaic micro-cells. A number of parameters in the design of the micro-cell for implementation in a power converter chip have been investigated. Matching the beam profile to the active region, as well as maximizing the contact area improves the device efficiency. The effect of doping profile and junction type on the device performance, suggests silicon is a cost effective and suitable material for this application.
Opto-Vlsi-Based Rf Beamformer For Space Division Multiple Access Network, Budi Juswardy, Feng Xiao, Kamal Alameh
Opto-Vlsi-Based Rf Beamformer For Space Division Multiple Access Network, Budi Juswardy, Feng Xiao, Kamal Alameh
Research outputs pre 2011
In this paper, the architecture of a photonic-assisted smart antenna for Space-division Multiple Access (SDMA) is described. Antenna beam steering is achieved by generating independent true-time delay (TTD) for each element in the antenna arrays, through the use of an Opto-VLSI Processor in conjunction with a 10-km single mode optical fibre. Experimental results demonstrate RF beam steering in 4-element linear patch antenna array operating at 1.85GHz are presented.
Bandwidth Allocation And Routing Information For Wireless Mobile Ad-Hoc Networks, Rajeshkumar Ramraj
Bandwidth Allocation And Routing Information For Wireless Mobile Ad-Hoc Networks, Rajeshkumar Ramraj
Research outputs pre 2011
An admission control Algorithm must organize among flows and should afford assurance of how the medium is shared between nodes. In a wired network, nodes can keep an eye on the medium to see how much bandwidth is being used by the network. On the other hand, in an Ad-Hoc network, during communication nodes possibly will use the bandwidth of neighbouring nodes. Consequently, the bandwidth consumption of flows and the accessible resources to a node are not local concepts, other than it being linked to the neighbouring nodes in carrier-sensing range. Current solutions do not address how to perform admission …
Jpeg Compression Of Monochrome 2d-Barcode Images Using Dct Coefficient Distributions, Keng Teong Tan, Douglas Chai
Jpeg Compression Of Monochrome 2d-Barcode Images Using Dct Coefficient Distributions, Keng Teong Tan, Douglas Chai
Research outputs pre 2011
Two dimensional (2D) barcodes are becoming a pervasive interface for mobile devices, such as camera phones. Often, only monochrome 2D-barcodes are used due to their robustness in an uncontrolled operating environment of camera phones. Most camera phones capture and store such 2D-barcode images in the baseline JPEG format. As a lossy compression technique, JPEG does introduce a fair amount of error in the decoding of captured 2D-barcode images. In this paper, we introduce an improved JPEG compression scheme for such barcode images. By altering the JPEG compression parameters based on the DCT coefficient distribution of such barcode images, the improved …
Challenges And Opportunities For Simulation Modelling Integrating Mine Haulage And Truck Shop Operations, Melinda Hodkiewicz, Steven Richardson, Richard Durham
Challenges And Opportunities For Simulation Modelling Integrating Mine Haulage And Truck Shop Operations, Melinda Hodkiewicz, Steven Richardson, Richard Durham
Research outputs pre 2011
Historically considerable work has been done to develop models that simulate truck haulage for both underground and open-pit operations. However, this work frequently simplifies or overlooks aspects such as the reliability of the trucks, priority setting and maintenance strategies in the truck shop, and resourcing of the repair facilities. This paper provides an overview of work in this area that is specific to the mining industry and also relevant work from other sectors that might inform how improvements can be made. The paper proposes some specific projects that will assist in identifying technical issues. Initially, it is important to understand …
Groove Shape-Dependent Absorption Enhancement Of 850 Nm Msm Photodetectors With Nano-Gratings, Narottam Das, Ayman Karar, Mikhail Vasiliev, Chee Leong Tan, Kamal Alameh, Yong Tak Lee
Groove Shape-Dependent Absorption Enhancement Of 850 Nm Msm Photodetectors With Nano-Gratings, Narottam Das, Ayman Karar, Mikhail Vasiliev, Chee Leong Tan, Kamal Alameh, Yong Tak Lee
Research outputs pre 2011
Finite difference time-domain (FDTD) analysis is used to investigate the light absorption enhancement factor dependence on the groove shape of the nano-gratings etched into the surfaces of metal-semiconductor-metal photodetector (MSM-PD) structures. By patterning the MSM-PDs with optimized nano-gratings a significant improvement in light absorption near the design wavelength is achieved through plasmon-assisted electric field concentration effects. Simulation results show about 50 times light absorption enhancement for 850 nm light due to improved optical signal propagation through the nano-gratings.
High-Performance Thin-Film Garnet Materials For Magneto-Optic And Nanophotonic Applications, Mikhail Vasiliev, Mohammad Nur E Alam, Viacheslav Kotov, Kamal Alameh
High-Performance Thin-Film Garnet Materials For Magneto-Optic And Nanophotonic Applications, Mikhail Vasiliev, Mohammad Nur E Alam, Viacheslav Kotov, Kamal Alameh
Research outputs pre 2011
Since the 1960's, Magneto-optic (MO) garnet materials have been studied extensively. These materials can possess world-record MO performance characteristics in terms of Faraday rotation and optical quality. Among the rear-earth-doped garnets, the Bi-substituted iron garnet is the best candidate for use as a functional material in different integrated-optics, imaging/image processing applications and also in forward-looking applications e.g. the design of metamaterials with non-reciprocal properties. We have established a set of technologies for fabricating ferrimagnetic garnet films of type (BiDy)3(FeGa)5O12 and also garnet-oxide nanocomposite (BiDy)3(FeGa)5O12 : Bi2O3 layers possessing record-high MO quality across the visible spectral range using RF-magnetron sputtering and …
Design Of High-Sensitivity Plasmonics-Assisted Gaas Metal-Semiconductor-Metal Photodetectors, Ayman Karar, Narottam Das, Chee Leong Tan, Kamal Alameh, Yong Lee
Design Of High-Sensitivity Plasmonics-Assisted Gaas Metal-Semiconductor-Metal Photodetectors, Ayman Karar, Narottam Das, Chee Leong Tan, Kamal Alameh, Yong Lee
Research outputs pre 2011
In this paper, we use the finite difference timedomain (FDTD) method to optimize the light absorption of an ultrafast plasmonic GaAs metal-semiconductor-metal photodetector (MSM-PD) employing metal nano-gratings. The MSM-PD is optimized geometrically, leading to improved light absorption near the designed wavelength of GaAs through plasmon-assisted electric and magnetic field concentration through a subwavelength aperture. Simulation results show up to 10-times light absorption enhancement at 867 nm due to surface plasmon polaritons (SPPs) propagation through the metal nano-grating, in comparison to conventional MSM-PD.
Distributed Sensing, Communications, And Power In Optical Fibre Smart Sensor Networks For Structural Health Monitoring, Graham Wild, Gary Allwood, Steven Hinckley
Distributed Sensing, Communications, And Power In Optical Fibre Smart Sensor Networks For Structural Health Monitoring, Graham Wild, Gary Allwood, Steven Hinckley
Research outputs pre 2011
With distributed optical fibre sensors, a single source, a single detector, and a single fibre can be used for up to 1000 fibre Bragg grating sensors. However, this multiplexing architecture is not robust. Damage to any of these individual components can render the entire sensing system useless. To achieve a robust structural health monitoring system, this type of multiplexing cannot be utilised. To overcome the lack of robustness associated with multiplexing optical fibre sensors together, intelligence along with sensors needs to be distributed around a structure. Distributed Optical Fibre Smarts Sensing (DOFSS) represents a sensing architecture for the structural health …
Comparison Between Neural Network Based Pi And Pid Controllers, Mohammed Hassan, Ganesh Kothapalli
Comparison Between Neural Network Based Pi And Pid Controllers, Mohammed Hassan, Ganesh Kothapalli
Research outputs pre 2011
The Pneumatic actuation systems are widely used in industrial automation, such as drilling, sawing, squeezing, gripping, and spraying. Also, they are used in motion control of materials and parts handling, packing machines, machine tools, and in robotics; e.g. two-legged robot. In this paper, a Neural Network based PI controller and Neural Network based PID controller are designed and simulated to increase the position accuracy in a pneumatic servo actuator. In these designs, a well-trained Neural Network provides these controllers with suitable gains depending on feedback representing changes in position error and changes in external load force. These gains should keep …
A New Perspective On First Read Rate Of 2d Barcodes In Mobile Applications, Keng Tiong (Alf) Tan, Douglas Chai
A New Perspective On First Read Rate Of 2d Barcodes In Mobile Applications, Keng Tiong (Alf) Tan, Douglas Chai
Research outputs pre 2011
The first read rate (FRR) has been one of the traditional benchmark metric for measuring the performance of barcode systems. In recent studies, it has been noted that the FRR alone is not a complete measure of user experience, especially of barcodes in mobile applications. In this paper, we present a further three factors that would influence the user experience of mobile 2D barcodes. Our investigation is based on a quantitative survey of a controlled study participated by 250 lay users of mobile phones, through reading QRCode and Data Matrix barcodes with a variety of camera mobile phones. Observations from …
The Use Of Alignment Cells In Mmcc Barcode, Siong Khai Ong, Douglas Chai, Alexander Rassau
The Use Of Alignment Cells In Mmcc Barcode, Siong Khai Ong, Douglas Chai, Alexander Rassau
Research outputs pre 2011
The QR code, a monochrome 2D barcode, is a popular and commonly used barcode system worldwide. QR codes can easily be read using a mobile phone with the appropriate decoder. As there is an increasing need for higher data capacity barcodes, some newer 2D barcodes, such as the MMCC code, have adopted the use of colour. However, the use of colour introduces more challenges for mobile phone decoders than with monochrome codes. In this paper, the use of alignment cells within the MMCC code is proposed to improve the robustness of the colour barcode when used in a mobile environment. …
High Utility Video Surveillance System On Public Transport Using Wimax Technology, Iftekhar Ahmad, Daryoush Habibi
High Utility Video Surveillance System On Public Transport Using Wimax Technology, Iftekhar Ahmad, Daryoush Habibi
Research outputs pre 2011
Video surveillance on public transport is a useful tool to fight against anti-social behaviour like vandalism, harassment, graffiti and terrorism. Real-time video surveillance on moving public transport faces serious technological challenges mainly due to limited throughput offered by existing communication technologies at high vehicular speeds. Success of real-time video surveillance on public transport heavily depends on future communication technologies like WiMAX. WiMAX has emerged as an exciting technology with promises to offer high throughput and improved quality of services (QoS), key requirements for video surveillance on public transport. WiMAX however, offers limited throughput at high vehicular speeds mainly because of …
Simulation Of A Hybrid Polywell And Stacked Gradient Poly-Homojunction Cmos Photodiode, Paul V. Jansz, Steven Hinckley
Simulation Of A Hybrid Polywell And Stacked Gradient Poly-Homojunction Cmos Photodiode, Paul V. Jansz, Steven Hinckley
Research outputs pre 2011
In this paper, we have simulated the performance of a photodiode array that has multiple wells per pixel as well as a stacked-gradient poly-homojunction (StaG) geometry. The pixel response resolution was improved when the first StaG epilayer was within 2 μm of the space charge region (SCR).
Adiabatic Coherent Quantum Tunneling Of Ultracold Atoms Trapped In An Asymmetrical Two-Dimensional Magnetic Lattices, Ahmed Abdelrahman, Kamal Alameh, Peter Hannford
Adiabatic Coherent Quantum Tunneling Of Ultracold Atoms Trapped In An Asymmetrical Two-Dimensional Magnetic Lattices, Ahmed Abdelrahman, Kamal Alameh, Peter Hannford
Research outputs pre 2011
We propose a new method to realize a two-dimensional magnetic lattice, having two different configurations of asymmetric magnetic lattice, which exhibits magnetic band gap structure, and a symmetric magnetic lattice. We also describe the tunneling mechanisms of magnetically trapped ultracold atoms, prepared in a degenerate quantum gas such as Bose-Einstein Condensate (BEC). A coherent quantum tunneling of ultracold atoms between the sites of the asymmetrical magnetic lattice can be realized which induces the adiabatically controlled dc Josephson current. At critical phase transitions, namely at certain values of site phase difference and population fraction, a plasma oscillation can be observed in …
Adaptive Multi/Demultiplexers For Optical Signals With Arbitrary Wavelength Spacing, Feng Xiao, Kamal Alameh
Adaptive Multi/Demultiplexers For Optical Signals With Arbitrary Wavelength Spacing, Feng Xiao, Kamal Alameh
Research outputs pre 2011
We propose and demonstrate the principle of a novel adaptive wavelength division multiplexer/demultiplexer structure based on Opto-VLSI processing. By driving an Opto-VLSI processor with an appropriate phase hologram, optical signals of arbitrary wavelengths from different input fiber ports can be multiplexed into a common output fiber port. In addition, wavelength division multiplexed channels of arbitrary wavelength spacings can also be demultiplexed and dynamically routed into arbitrary output fiber ports. A proof-of-principle 1×3 adaptive multiplexer/demultiplexers is experimentally demonstrated.
Cladding Modes Analysis Of Photonics Crystal Fiber For Refractive Index Sensors Using Finite Element Method, Naeem Khurram, Linh Viet Nguyen, Kamal Alameh, Youngjoo Chung
Cladding Modes Analysis Of Photonics Crystal Fiber For Refractive Index Sensors Using Finite Element Method, Naeem Khurram, Linh Viet Nguyen, Kamal Alameh, Youngjoo Chung
Research outputs pre 2011
We developed a Finite Element package to analyze cladding mode field extensions into the air-holes of photonics crystal fiber for refractive index sensing. Our analysis could determine the most sensitive cladding mode for liquid sensing.
Experimental Investigation Of Magnetic Circular Dichroism Spectrum And Stress Induced Optical Activity In A Single-Defect Photonic Crystal, Mikhail Vasiliev, Kamal Alameh, Vladimir I. Burkov, V. V. Koledov, Viacheslav A. Kotov, V. G. Shavrov, Anotoly K. Zvezdin
Experimental Investigation Of Magnetic Circular Dichroism Spectrum And Stress Induced Optical Activity In A Single-Defect Photonic Crystal, Mikhail Vasiliev, Kamal Alameh, Vladimir I. Burkov, V. V. Koledov, Viacheslav A. Kotov, V. G. Shavrov, Anotoly K. Zvezdin
Research outputs pre 2011
Experimental investigation results for the magnetic circular dichroism spectrum (MCD) of a photonic crystal (PC) are presented. We found that in the vicinity of the transmission peak within the photonic bandgap and also near the bandgap edges, the circular dichroism is measurable even in the absence of any applied magnetic field. The application of magnetic field leads to generating an additional MCD signal measurable at the wavelengths near the “defect mode” transmittance line.
Call Admission Control Scheme For Improved Quality Of Service In Wimax Communication At Vehicular Speeds, Iftekhar Ahmad, Daryoush Habibi
Call Admission Control Scheme For Improved Quality Of Service In Wimax Communication At Vehicular Speeds, Iftekhar Ahmad, Daryoush Habibi
Research outputs pre 2011
The IEEE 802.16e standard, also known as mobile WiMAX, has emerged as an exciting mobile wireless communication technology that promises to offer both high throughput and guaranteed quality of service (QoS). Call admission control (CAC) scheme serves as a useful tool for WiMAX, which ensures that resources are not overcommitted and thereby, all existing connections enjoy guaranteed QoS. Existing CAC schemes largely depend on readily available information like currently available resources and bandwidth demand of the new call while making an acceptance or rejection decision once a new request arrives. Since wireless channels are not as reliable as wired communication, …
The Properties Of Nanocomposite (Bidy)3(Fega)5o12:Bi2o3 Magneto-Optic Garnet Films For Applications In Nanophotonics, Ultrafast Switching And Integrated Optoelectronics, Mikhail Vasiliev, Mohammad Nur E Alam, Viacheslav Kotov, Kamal Alameh
The Properties Of Nanocomposite (Bidy)3(Fega)5o12:Bi2o3 Magneto-Optic Garnet Films For Applications In Nanophotonics, Ultrafast Switching And Integrated Optoelectronics, Mikhail Vasiliev, Mohammad Nur E Alam, Viacheslav Kotov, Kamal Alameh
Research outputs pre 2011
We investigate the properties and applications of newly-developed RF-sputtered nano-composites with record-high magneto-optic quality (exceeding 25° at 532 nm and 42° at 635 nm). Bi-substituted dysprosium-gallium iron garnet layers with excess co-sputtered bismuth oxide content are demonstrated to possess very attractive optical and magnetic properties, which makes them suitable for novel magneto-optic and nanophotonic applications.
Multi-Wavelength Laser Scanning Architecture For Object Discrimination, Kavitha Venkataraayan, Sreten Askraba, Kamal Alameh, Clifton Smith
Multi-Wavelength Laser Scanning Architecture For Object Discrimination, Kavitha Venkataraayan, Sreten Askraba, Kamal Alameh, Clifton Smith
Research outputs pre 2011
A novel method for identifying and discriminating various objects using five different lasers is described. This method uses a laser combination module that allows five laser diodes of different wavelengths to sequentially emit identically polarized light beams through a common aperture, along one optical path. Each laser beam enters a custom-made curved optical cavity for multi-beam spot generation through internal partial beam reflection. The intensity of the reflected light beams from each spot is detected by a high-speed area scan image sensor. Object discrimination based on analyzing the Gaussian profile of reflected laser light at distinguishing wavelengths is demonstrated.
Call Admission Control Scheme For The Ieee 802.16e At Vehicular Speeds, Iftekhar Ahmad, Daryoush Habibi
Call Admission Control Scheme For The Ieee 802.16e At Vehicular Speeds, Iftekhar Ahmad, Daryoush Habibi
Research outputs pre 2011
The IEEE 802.16e standard has emerged as an exciting mobile wireless broadband technology that promises to deliver both high throughput and guaranteed quality of service (QoS). Call admission control (CAC) scheme serves as a great utility for WiMAX, which ensures that resources are not over committed and thereby, all existing connections enjoy guaranteed quality of service. Existing CAC schemes largely depend on computation of available resources while making an acceptance or rejection decision once a new request arrives. Since wireless channels are not as reliable as wired communication, CAC scheme in WiMAX communication faces a serious challenge of making a …