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Articles 31 - 52 of 52
Full-Text Articles in Engineering
Performance Of Reconfigurable Free-Space Card-To-Card Optical Interconnects Under Atmospheric Turbulence, Ke Wang, Ampalavanapillai Nirmalathas, Christina Lim, Efstratios Skafidas, Kamal Alameh
Performance Of Reconfigurable Free-Space Card-To-Card Optical Interconnects Under Atmospheric Turbulence, Ke Wang, Ampalavanapillai Nirmalathas, Christina Lim, Efstratios Skafidas, Kamal Alameh
Research outputs 2012
Free-space based card-to-card optical interconnects are promising candidates for the provision of parallel high-speed and reconfigurable interconnectivity in data-centers and high-performance computing clusters. However, the atmospheric turbulence may degrade the interconnect performance due to the beam wander, signal scintillation, and beam broadening effects. In this paper, the experimental investigation of the impact of both moderate and comparatively strong atmospheric turbulence on the bit-error-rate (BER) performance of our proposed reconfigurable free-space card-to-card optical interconnects is presented. Experimental results show that the BER performance does suffer power penalties of ∼0.5 dB and ∼1.6 dB at BER of 10 -9 under moderate and …
Performance Of Termite-Hill Routing Algorithm On Sink Mobility In Wireless Sensor Networks, Adamu M Zungeru, Li-Minn Ang, Kah Phooi Seng
Performance Of Termite-Hill Routing Algorithm On Sink Mobility In Wireless Sensor Networks, Adamu M Zungeru, Li-Minn Ang, Kah Phooi Seng
Research outputs 2012
High efficient and energy-aware routing is an important issue for the design of resource constrained environments like Wireless Sensor Networks (WSNs). Many protocols have been developed for WSN that try to overcome the constraints that characterized this type of networks. Termite based routing protocols can add a significant contribution to assist in the maximization of the network lifetime without performance degradation. But this is only possible by means of an adaptable and balanced algorithm that takes into account the main constraints of WSN. This paper presents a biological inspired self-organized routing protocol for WSN which is based on termite colony …
Gamma Irradiation In Fibre Bragg Gratings, Desmond Baccini, Steven Hinckley, Graham Wild, Connie Banos, Justin B. Davies
Gamma Irradiation In Fibre Bragg Gratings, Desmond Baccini, Steven Hinckley, Graham Wild, Connie Banos, Justin B. Davies
Research outputs 2012
We report a preliminary study of gamma radiation effects on the current generation of optical fibre Bragg grating sensors, and the effects of relaxation after gamma irradiation, as a function of dose.
Unidirectionally Optical Coupling From Free Space Into Silicon Waveguide With Wide Flat-Top Angular Efficiency, K Li, G Li, Feng Xiao, Fan Lu, Zhonghua Wang, A Xu
Unidirectionally Optical Coupling From Free Space Into Silicon Waveguide With Wide Flat-Top Angular Efficiency, K Li, G Li, Feng Xiao, Fan Lu, Zhonghua Wang, A Xu
Research outputs 2012
A grating coupling scheme from free-space light into silicon waveguide with a remarkable property of wide flat-top angular efficiency is proposed and theoretically investigated. The coupling structure is composed of two cascaded gratings with a proper distance between their peak angular efficiencies. A quantitative semi-analytical theory based on coupled-mode models is developed for performance prediction and validated with the fully vectorial aperiodic Fourier modal method (a-FMM). With the theory, wide flat-top angular response is achieved and the conditions are pointed out. Proof-of-principle demonstrations show that the -1 dB angular widtha figure of merit to evaluate the flat-top performanceis broadened to …
Polymer Chain Distribution Reorganization For Improving The Power Conversion Efficiency Of Polymer Solar Cells, Baofu Ding, Kamal Alameh
Polymer Chain Distribution Reorganization For Improving The Power Conversion Efficiency Of Polymer Solar Cells, Baofu Ding, Kamal Alameh
Research outputs 2012
We investigate the influence of the post solvent evaporation time delay on the performance of polymer solar cell (PSC) devices employing a bulk heterojunction photoactive polymer layer of regioregular poly(3-hexylthiophene) as electron donor and polymer [6,6]-thienylC61 butyric acid methyl ester as an electron acceptor. Characterization of the fabricated solar cell devices clearly demonstrates balanced transport of electrons and holes in the blend and confirms increased surface roughness and crystallinity of the films when post solvent evaporation time delay is optimised. An optimum device performance is obtained with 72 hours of post solvent evaporation time delay, achieving a power conversion efficiency …
Optimisation Of Power Detection Interrogation Methods For Fibre Bragg Grating Sensors, Graham Wild, Steven Richardson
Optimisation Of Power Detection Interrogation Methods For Fibre Bragg Grating Sensors, Graham Wild, Steven Richardson
Research outputs 2012
We present a method to optimise the performance of power detection interrogation systems for fibre Bragg grating sensors. The performance of the different systems can be optimised in terms of their sensitivity and/or dynamic range.
Diffraction Of Digital Micromirror Device Gratings And Its Effect On Properties Of Tunable Fiber Lasers, Xiao Chen, Binbin Yan, Feijun Song, Yiquan Wang, Feng Xiao, Kamal Alameh
Diffraction Of Digital Micromirror Device Gratings And Its Effect On Properties Of Tunable Fiber Lasers, Xiao Chen, Binbin Yan, Feijun Song, Yiquan Wang, Feng Xiao, Kamal Alameh
Research outputs 2012
A digital micromirror device (DMD) is a kind of widely used spatial light modulator. We apply DMD as wavelength selector in tunable fiber lasers. Based on the two-dimensional diffraction theory, the diffraction of DMD and its effect on properties of fiber laser parameters are analyzed in detail. The theoretical results show that the diffraction efficiency is strongly dependent upon the angle of incident light and the pixel spacing of DMD. Compared with the other models of DMDs, the 0.55 in. DMD grating is an approximate blazed state in our configuration, which makes most of the diffracted radiation concentrated into one …
Modular Dynamic Rbf Neural Network For Face Recognition, Sue Inn Ch'ng, Kah Phooi Seng, Li-Minn Ang
Modular Dynamic Rbf Neural Network For Face Recognition, Sue Inn Ch'ng, Kah Phooi Seng, Li-Minn Ang
Research outputs 2012
Over the years, we have seen an increase in the use of RBF neural networks for the task of face recognition. However, the use of second order algorithms as the learning algorithm for all the adjustable parameters in such networks are rare due to the high computational complexity of the calculation of the Jacobian and Hessian matrix. Hence, in this paper, we propose a modular structural training architecture to adapt the Levenberg-Marquardt based RBF neural network for the application of face recognition. In addition to the proposal of the modular structural training architecture, we have also investigated the use of …
Developing An Educational Video For Utilising An Oscilloscope In First Year Physics, Daniel Oswald, Graham Wild, Steven Hinckley
Developing An Educational Video For Utilising An Oscilloscope In First Year Physics, Daniel Oswald, Graham Wild, Steven Hinckley
Research outputs 2012
We report the development of a multimedia resource designed to aid undergraduate engineering and physics students in learning the operation and functions of a Digital Storage Oscilloscope.
In-Ground Optical Fibre Bragg Grating Pressure Switch For Security Applications, Gary Allwood, Graham Wild, Steven Hinckley
In-Ground Optical Fibre Bragg Grating Pressure Switch For Security Applications, Gary Allwood, Graham Wild, Steven Hinckley
Research outputs 2012
In this study, a fibre Bragg grating (FBG) was embedded beneath three common flooring materials acting as a pressure switch for in-ground intrusion detection. This is achieved using an intensiometric detection system, where a laser diode and FBG were optically mismatched so that there was a static dc offset from the transmitted and reflected optical power signals. As pressure was applied, in the form of a footstep, a strain induced wavelength shift occurred that could then be detected by converting the wavelength shift into an intensity change. The change in intensity caused a significant change in the DC offset which …
Graph Theory For Survivability Design In Communication Networks, Daryoush Habibi, Quoc Viet Phung
Graph Theory For Survivability Design In Communication Networks, Daryoush Habibi, Quoc Viet Phung
Research outputs 2012
Design of survivable communication networks has been a complex task. Without establishing network survivability, there can be severe consequences when a physical link fails. Network failures which may be caused by dig-ups, vehicle crashes, human errors, system malfunctions, fire, rodents, sabotage, natural disasters (e.g. floods, earthquakes, lightning storms), and some other factors, have occurred quite frequently and sometimes with unpredictable consequences. To tackle these, survivability measures in a communication network can be implemented at the service layer, the logical layer, the system layer, and the physical layer.
Solidworks Secondary Development With Visual Basic 6 For An Automated Modular Fixture Assembly Approach, Uday Farhan, Simona O'Brien, Majid Tolouei Rad
Solidworks Secondary Development With Visual Basic 6 For An Automated Modular Fixture Assembly Approach, Uday Farhan, Simona O'Brien, Majid Tolouei Rad
Research outputs 2012
Modular fixtures (MFs) play an important role in terms of cost and production time reduction in manufacturing processes. In this paper, the authors illustrate an automated approach for MFs design and assembly. This approach is based on the secondary development of SolidWorks integrating with Visual Basic (VB) 6 programing language. SolidWorks API (Application programming interface) functions were applied in order to control SolidWorks commands and assembly operations. An ActiveX DLL project was created in VB 6 and a plug-in file in .dll format was generated. The outcomes were creating new menus in SolidWorks environment for selecting, inserting, and assembling MFs …
A New Wsn Paradigm For Environmental Monitoring And Data Collection, Eric Dines, Hasanain Al-Majeed, Asanka Fernando, Mutaz Abdalla, Jaydeepsinh Gohil
A New Wsn Paradigm For Environmental Monitoring And Data Collection, Eric Dines, Hasanain Al-Majeed, Asanka Fernando, Mutaz Abdalla, Jaydeepsinh Gohil
Research outputs 2012
Data collection of environmental phenomena has traditionally been a very manual process. Even the advent of electronic data logging instruments has not significantly reduced the workload for managing instruments in the field. Recently however, low-cost microcontroller systems with wireless connectivity, called wireless sensor networks (WSNs) have been developed. With the proliferation of low-cost sensing elements, WSNs should be transforming environmental monitoring, but certain shortcomings in the current WSN paradigm have conspired against widespread field deployment. These are: battery capacity limitations; specialised wireless protocols that exclude WSNs from direct integration into existing data networks; and closed rather than open and extensible …
Fuzzy Interference System In Energy Demand Prediction, Thair Mahmoud, Daryoush Habibi, Octavian Bass, Stefan Lachowicz
Fuzzy Interference System In Energy Demand Prediction, Thair Mahmoud, Daryoush Habibi, Octavian Bass, Stefan Lachowicz
Research outputs 2012
No abstract available.
Metal-Semiconductor-Metal Photodetector With Enhanced Te-Polarization Transmission, Ayman Karar, Chee Leong Tan, Kamal Alameh, Yong Lee, Ampalavanapillai Nirmalathas
Metal-Semiconductor-Metal Photodetector With Enhanced Te-Polarization Transmission, Ayman Karar, Chee Leong Tan, Kamal Alameh, Yong Lee, Ampalavanapillai Nirmalathas
Research outputs 2012
In this paper, we use the finite difference time-domain (FDTD) method to optimize the TE-polarized light transmission of a metal-semiconductor-metal photodetector (MSMPD) employing a dielectric waveguide on top of metal nano-gratings. Simulation results demonstrate that the funneling transmission of the TE-polarized light through the nanoslit of the structure is highly dependent on the structure geometries such as the waveguide and nano-grating heights. We also demonstrate that adding a dielectric waveguide layer on top of the nano-metal grating supports both the TM- and TE polarizations, and enhances the light transmission for TE-polarization approximately 3-times.
Stability Analysis Of An Autonomous Microgrid Operation Based On Particle Swarm Optimization, Waleed Al-Saedi, Stefan Lachowicz, Daryoush Habibi, Octavian Bass
Stability Analysis Of An Autonomous Microgrid Operation Based On Particle Swarm Optimization, Waleed Al-Saedi, Stefan Lachowicz, Daryoush Habibi, Octavian Bass
Research outputs 2012
This paper presents the stability analysis for an inverter based Distributed Generation (DG) unit in an autonomous microgrid operation. The small-signal model of the controlled Voltage Source Inverter (VSI) system is developed in order to investigate the dynamic stability for the given operating point and under the proposed power controller. This model includes all the details of the proposed controller, while no switching actions are considered. System oscillatory modes and the sensitivity to the control parameters are the main performance indices which are considered, particularly when the microgrid is islanded or under the load change condition. In this work, the …
Fuzzy Logic For Smart Utilisation Of Storage Devices In A Typical Microgrid, Thair Mahmoud, Daryoush Habibi, Octavian Bass
Fuzzy Logic For Smart Utilisation Of Storage Devices In A Typical Microgrid, Thair Mahmoud, Daryoush Habibi, Octavian Bass
Research outputs 2012
Efficient utilisation of Storage Devices (SD) among multiple sources of dispatch within a typical microgrid have a substantial impact on reducing the economic and environmental generation costs in that particular microgrid. Eventually, managing the multiple sources that supply energy simultaneously is a big engineering challenge. The complexity rises due the uncertainty of demand, generation cost, availability of renewable energy sources and (charging/discharging) time and price for the installed SD. This paper introduces a utilisation method that makes the SD more efficient in supplying the electricity within a typical medium size enterprise microgrid. The method is simply targeting the dynamic charging …
Low Coherence Interferometry Modelling Using Combined Broadband Gaussian Light Sources, Paul Jansz, Graham Wild, Steven Richardson, Steven Hinckley
Low Coherence Interferometry Modelling Using Combined Broadband Gaussian Light Sources, Paul Jansz, Graham Wild, Steven Richardson, Steven Hinckley
Research outputs 2012
Using a Low Coherence Interferometry (LCI) model, a comparison of broadband single-Gaussian and multi-Gaussian light sources has been undertaken. For single-Gaussian sources, the axial resolution improved with source bandwidth, confirming the coherence length relation that resolution for single Gaussian sources improves with increasing spectral bandwidth. However, narrow bandwidth light sources resulted in interferograms with overlapping strata peaks and the loss of individual strata information. For multiple-Gaussian sources with the same bandwidth, spectral side lobes increased, reducing A-scan reliability to show accurate layer information without eliminating the side lobes. The simulations show the conditions needed for resolution of strata information for …
Wavelength Division Multiplexing Of A Fibre Bragg Grating Sensor Using Transmit-Reflect Detection System, Gary Allwood, Graham Wild, Steven Hinckley
Wavelength Division Multiplexing Of A Fibre Bragg Grating Sensor Using Transmit-Reflect Detection System, Gary Allwood, Graham Wild, Steven Hinckley
Research outputs 2012
Here we have performed dense wavelength division multiplexing of a single fibre Bragg grating (FBG) sensor interrogated using a transmit-reflect detection system. The FBG was used to sense an applied ultrasonic signal.
Low-Cost Educational Optical Coherence Tomography System For Thickness Measurmentstomography System For Thickness Measurments, Joshua Barr, Paul V. Jansz, Steven Hinckley, Graham Wild
Low-Cost Educational Optical Coherence Tomography System For Thickness Measurmentstomography System For Thickness Measurments, Joshua Barr, Paul V. Jansz, Steven Hinckley, Graham Wild
Research outputs 2012
We have developed an inexpensive rudimentary low coherence interferometer that can be used to measure sample thickness in the micron to mm range, and for exploring educational aspects of interferometry and optical coherence tomography.
Fuzzy-Based Adaptive Pricing Rules For A Typical Microgrid Energy Management System, Thair Mahmoud, Daryoush Habibi, Octavian Bass
Fuzzy-Based Adaptive Pricing Rules For A Typical Microgrid Energy Management System, Thair Mahmoud, Daryoush Habibi, Octavian Bass
Research outputs 2012
This paper details the implementation of adaptive pricing rules for a typical autonomous microgrid. The proposed rules aim at generating competitive prices based on monitoring the microgrid's operation conditions, thus maximising the profit from selling electricity to the utility grid throughout the microgrid's lifetime. A decision tree based linear programming and fuzzy system are developed to generate the proposed rules. Microgrid's operation conditions such as electricity demand, generation price and amount of generation are considered in the generated pricing rules. To simulate the behaviour of electronic competition, we have implemented a Multi-Agent System (MAS) to represent the performance of two …
Biomedical Image Signal Processing For Reflection-Based Imaging, Paul Jansz, Steven Richardson, Graham Wild, Steven Hinckley
Biomedical Image Signal Processing For Reflection-Based Imaging, Paul Jansz, Steven Richardson, Graham Wild, Steven Hinckley
Research outputs 2012
Optical coherence tomography (OCT), ultrasound and other reflection based biomedical imaging technologies involve image signal processing that is primarily a filtering, digitizing and summing process so that the tissue cross-section can be visualized. In particular, in OCT, a series of adjacent one dimensional in-vivo axial interferograms (A-scan) are summed to form a two dimensional (B-scan) reflection map or reflectogram. Further graphical combinations can add adjacent B-scan together to form three dimensional C-scans. A physician can make a subjective interpretation and evaluation from the B and/or C-scans that may lead to actions impacting on the patient’s prognosis. More objective information can …