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Articles 3181 - 3210 of 14367

Full-Text Articles in Social and Behavioral Sciences

Computational Fluid Dynamics Simulation Of Carbon Dioxide Dispersion In A Complex Environment, Bin Liu, Xiong Liu, Cheng Lu, Ajit R. Godbole, Guillaume Michal, A Kiet Tieu Jan 2016

Computational Fluid Dynamics Simulation Of Carbon Dioxide Dispersion In A Complex Environment, Bin Liu, Xiong Liu, Cheng Lu, Ajit R. Godbole, Guillaume Michal, A Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part A

In order to quantitatively evaluate the risk associated with the Carbon Capture and Storage (CCS) technology, a deeper understanding of CO2 dispersion resulting from accidental releases is essential. CO2 is a heavier-than-air gas. Its dispersion patterns may vary according to local conditions. This study focuses on CO2 dispersion over complex terrains. Computational Fluid Dynamics (CFD) models were developed to simulate the CO2 dispersion over two hypothetical topographies: (1) a flat terrain with an axisymmetric hill and (2) a simplified model of an urban area with buildings. The source strength, wind velocity and height of the buildings were varied to investigate …

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Dynamic Response Of Symmetrical And Asymmetrical Sandwich Plates With Shear Thickening Fluid Core Subjected To Penetration Loading, Z. H. Tan, L Zuo, Weihua Li, L S. Liu, Peng Zhai Jan 2016

Dynamic Response Of Symmetrical And Asymmetrical Sandwich Plates With Shear Thickening Fluid Core Subjected To Penetration Loading, Z. H. Tan, L Zuo, Weihua Li, L S. Liu, Peng Zhai

Faculty of Engineering and Information Sciences - Papers: Part A

Symmetrical and asymmetrical sandwich plates with a shear thickening fluid (STF) core were designed to be penetrated by a cylindrical projectile at various impact velocities. These STFs consist of SiO2/PEG400, and the volume fractions of SiO2 nano-particles are 54% and 56%, respectively. Failure mode of the rear face sheet of the symmetrical sandwich plate is petal perforation, but the rear face sheet of the asymmetrical sandwich plate failed in plug perforation mode at the velocity of less than 80 m/s and in the petal perforation mode at the velocity faster than 90 m/s. The results showed that both the face …

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A Comparative Study Of Fluid Flow And Mass Transfer In A Trumpet-Shaped Ladle Shroud Using Large Eddy Simulation, Jiangshan Zhang, Jingshe Li, Yi Yan, Zhixin Chen, Shufeng Yang, Jingwei Zhao, Zhengyi Jiang Jan 2016

A Comparative Study Of Fluid Flow And Mass Transfer In A Trumpet-Shaped Ladle Shroud Using Large Eddy Simulation, Jiangshan Zhang, Jingshe Li, Yi Yan, Zhixin Chen, Shufeng Yang, Jingwei Zhao, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

The advantages of trumpet-shaped ladle shrouds (TLS) have been frequently demonstrated over conventional straight-bore ladle shrouds (CLS) with respect to production efficiency and molten steel quality in continuous casting practices. The present study is to shed some lights on why the TLS are better than the CLS design by examining the fluid dynamics and mass transfer using large eddy simulation. The obtained numerical results were validated with particle imaging velocimetry experiments. Flow velocity, deformation, turbulent energy dissipation, and mixing kinetics of tracer were discussed. The results showed that the entering jet of the CLS flowed straight down into the tundish …

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Effect Of Sterilization Methods On Electrospun Poly(Lactic Acid) (Pla) Fiber Alignment For Biomedical Applications, T A. M Valente, D M. Silva, P S. Gomes, M H. Fernandes, J D. Santos, Vitor Sencadas Jan 2016

Effect Of Sterilization Methods On Electrospun Poly(Lactic Acid) (Pla) Fiber Alignment For Biomedical Applications, T A. M Valente, D M. Silva, P S. Gomes, M H. Fernandes, J D. Santos, Vitor Sencadas

Faculty of Engineering and Information Sciences - Papers: Part A

Medically approved sterility methods should be a major concern when developing a polymeric scaffold, mainly when commercialization is envisaged. In the present work, poly(lactic acid) (PLA) fiber membranes were processed by electrospinning with random and aligned fiber alignment and sterilized under UV, ethylene oxide (EO), and γ-radiation, the most common ones for clinical applications. It was observed that UV light and γ-radiation do not influence fiber morphology or alignment, while electrospun samples treated with EO lead to fiber orientation loss and morphology changing from cylindrical fibers to ribbon-like structures, accompanied to an increase of polymer crystallinity up to 28%. UV …

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Renewable Energy Management In A Remote Area Using Modified Gravitational Search Algorithm, Sahand Ghavidel, Jamshid Aghaei, Kashem M. Muttaqi, Alireza Heidari Jan 2016

Renewable Energy Management In A Remote Area Using Modified Gravitational Search Algorithm, Sahand Ghavidel, Jamshid Aghaei, Kashem M. Muttaqi, Alireza Heidari

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, a small remote area which is located in Nigeria has been considered as a model to be tested by a managing scheme for providing both electricity and water. In this strategy, the groundwater is pumped into a water tank which can be later used for supplying required irrigation and drinking water. A PAT (Pump as Turbine) is used as a hybrid system for supplying electricity and water as well as storing water in the water tank. Also, a PV (photovoltaic plant), a package of batteries (BAT) in addition to a diesel ICE (internal combustion engine) are used …

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Application Of Advanced Bounding Surface Plasticity Model In Static And Seismic Analyses Of Zipingpu Dam, Mojtaba E. Kan, Hossein A. Taiebat Jan 2016

Application Of Advanced Bounding Surface Plasticity Model In Static And Seismic Analyses Of Zipingpu Dam, Mojtaba E. Kan, Hossein A. Taiebat

Faculty of Engineering and Information Sciences - Papers: Part A

The strong ground motion of the Wenchuan earthquake that hit the Zipingpu Dam in China in 2008 has provided an excellent benchmark to study the behaviour of large modern rockfill dams subjected to seismic loading. The performance of the dam during construction and prior to and after the earthquake loading has been recorded with good accuracy, and provides a reliable database to examine the reliability of available constitutive models and numerical methods in predicting the static and dynamic behaviour of embankment dams. In this paper, an advanced bounding surface plasticity model has been used in a series of numerical analyses …

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Information-How, Nir Fresco Jan 2016

Information-How, Nir Fresco

Faculty of Engineering and Information Sciences - Papers: Part A

The distinction between knowledge-how and knowledge-that has long been debated in the literature. This distinction can, arguably, be better understood in terms of a more fundamental distinction between information-how and information-that. Informationhow is prescriptive and informs a cognitive agent about which action(s) can be performed to achieve a particular outcome. Information-that is descriptive and informs the agent about events, objects and states of affairs in the world. Since the latter has received more attention in the literature, this article focuses on the former. We offer a new account of information-how that answers the question: 'When do data qualify as information-how?'.

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Beam Perturbation Characteristics Of A 2d Transmission Silicon Diode Array, Magic Plate, Z A. Alrowaili, Michael L. F Lerch, Marco Petasecca, Martin Carolan, Peter E. Metcalfe, Anatoly B. Rosenfeld Jan 2016

Beam Perturbation Characteristics Of A 2d Transmission Silicon Diode Array, Magic Plate, Z A. Alrowaili, Michael L. F Lerch, Marco Petasecca, Martin Carolan, Peter E. Metcalfe, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

The main objective of this study is to demonstrate the performance characteristics of the Magic Plate (MP) system when operated upstream of the patient in transmission mode (MPTM). The MPTM is an essential component of a real-time QA system designed for operation during radiotherapy treatment. Of particular interest is a quantitative study into the influence of the MP on the radiation beam quality at several field sizes and linear accelerator potential differences. The impact is measured through beam perturbation effects such as changes in the skin dose and/or percentage depth dose (PDD) (both in and out of field). The MP …

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Bottom-Up Microfabrication Process For Individually Controlled Conjugated Polymer Actuators, Alexandre Khaldi, Ali Maziz, Gursel Alici, Geoffrey M. Spinks, Edwin W. Jager Jan 2016

Bottom-Up Microfabrication Process For Individually Controlled Conjugated Polymer Actuators, Alexandre Khaldi, Ali Maziz, Gursel Alici, Geoffrey M. Spinks, Edwin W. Jager

Faculty of Engineering and Information Sciences - Papers: Part A

Handling of soft and fragile sub-millimeter sized samples such as cells and tissues requires new tools that allow delicate manipulation. Conducting polymer actuators show unique characteristics suitable to driving such manipulators, however despite their potential, the current fabrication method of the trilayer structures does not allow constructing advanced micromanipulators operating in air using this technology. Here we show a novel bottom-up microfabrication process for conjugated polymer trilayer actuators using various solid polymer electrolytes. In addition, the process design integrates contact pads, which has been an issue for small scale conducting polymer actuators. The microfabrication process starts with a patterned layer …

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A Strategy For Configuration Of An Integrated Flexible Sulfur Cathode For High-Performance Lithium-Sulfur Batteries, Hongqiang Wang, Wenchao Zhang, Hua-Kun Liu, Zaiping Guo Jan 2016

A Strategy For Configuration Of An Integrated Flexible Sulfur Cathode For High-Performance Lithium-Sulfur Batteries, Hongqiang Wang, Wenchao Zhang, Hua-Kun Liu, Zaiping Guo

Faculty of Engineering and Information Sciences - Papers: Part A

Lithium-sulfur batteries are regarded as promising candidates for energy storage devices owing to their high theoretical energy density. The practical application is hindered, however, by low sulfur utilization and unsatisfactory capacity retention. Herein, we present a strategy for configuration of the sulfur cathode, which is composed of an integrated carbon/sulfur/carbon sandwich structure on polypropylene separator that is produced using the simple doctor-blade technique. The integrated electrode exhibits excellent flexibility and high mechanical strength. The upper and bottom carbon layers of the sandwich-structured electrode not only work as double current collectors, which effectively improve the conductivity of the electrode, but also …

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Occurrence Of Trace Organic Contaminants In Wastewater Sludge And Their Removals By Anaerobic Digestion, Shufan Yang, Faisal I. Hai, William E. Price, James Mcdonald, Stuart J. Khan, Long D. Nghiem Jan 2016

Occurrence Of Trace Organic Contaminants In Wastewater Sludge And Their Removals By Anaerobic Digestion, Shufan Yang, Faisal I. Hai, William E. Price, James Mcdonald, Stuart J. Khan, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part A

This study aims to evaluate the occurrence of trace organic contaminants (TrOCs) in wastewater sludge and their removal during anaerobic digestion. The significant occurrence of 18 TrOCs in primary sludge was observed. These TrOCs occurred predominantly in the solid phase. Some of these TrOCs (e.g. paracetamol, caffeine, ibuprofen and triclosan) were also found at high concentrations (>10,000. ng/L) in the aqueous phase. The overall removal of TrOCs (from both the aqueous and solid phase) by anaerobic digestion was governed by their molecular structure (e.g. the presence/absence of electron withdrawing/donating functional groups). While an increase in sludge retention time (SRT) …

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Modelling Of Geocell-Reinforced Subballast Subjected To Cyclic Loading, M. Mahdi Biabani, Buddhima Indraratna, Ngoc Trung Ngo Jan 2016

Modelling Of Geocell-Reinforced Subballast Subjected To Cyclic Loading, M. Mahdi Biabani, Buddhima Indraratna, Ngoc Trung Ngo

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents the experimental and numerical studies of geocell-reinforced subballast subjected to cyclic loading. A series of laboratory experiments were conducted using a large-scale prismoidal triaxial apparatus that was subjected to relatively low confining pressures of σ'3 = 10-30 kPa and a frequency of f = 10 Hz. Numerical simulations were performed using the commercial finite element package ABAQUS in three dimensions to realistically model cellular confinement, and to study the effectiveness of geocell reinforcement on subballast. A cyclic loading with a periodic and positive full-sine waveform was adopted to model the geocell-reinforced subballast, which is similar to the …

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Load-Deformation Behaviour Of A Stone Column Using The Coupled Dem-Fdm Method, N T. Ngo, B Indraratna, C Rujikiatkamjorn Jan 2016

Load-Deformation Behaviour Of A Stone Column Using The Coupled Dem-Fdm Method, N T. Ngo, B Indraratna, C Rujikiatkamjorn

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents a novel coupled model of discrete element method (DEM) and finite difference method (FDM) to investigate the load-deformation of stone columns reinforced soft clay. In the proposed model, the soft clay domain was modelled by the continuum method using FLAC and stone column was modelled by the discrete element method using PFC2D. Algorithms and mathematical framework to assist coupling between the two domains were introduced, in which the DEM transfers forces and moment to the FDM and then the FDM provides an update of displacements to the DEM. The predicted load-deformation responses obtained from the coupling model …

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Experimental And Discrete Element Modelling Of Geocell-Stabilized Subballast Subjected To Cyclic Loading, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn, M. Mahdi Biabani Jan 2016

Experimental And Discrete Element Modelling Of Geocell-Stabilized Subballast Subjected To Cyclic Loading, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn, M. Mahdi Biabani

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents a study of the load-deformation behaviour of geocell-stabilised sub-ballast subjected to cyclic loading using a novel track process simulation apparatus. The tests were conducted at frequencies varying from 10-30 Hz. This frequency range is generally representative of Australian Standard Gauge trains operating up to 160 km/h. The discrete element method (DEM) was also used to model geocell-reinforced sub-ballast under plane strain conditions. The geocell was modelled by connecting a group of small circular balls together to form the desired geometry and aperture using contact and parallel bonds. Tensile and bending tests were carried out to calibrate the …

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Effect Of Different Frp Wrapping Arrangements On The Confinement Mechanism, Thong M. Pham, Jim Youssed, Muhammad N. S Hadi, Tung M. Tran Jan 2016

Effect Of Different Frp Wrapping Arrangements On The Confinement Mechanism, Thong M. Pham, Jim Youssed, Muhammad N. S Hadi, Tung M. Tran

Faculty of Engineering and Information Sciences - Papers: Part A

This study aims to investigate the structural behavior and failure modes of fiber-reinforced-polymer (FRP) confined concrete wrapped with different FRP arrangements. A total of twenty four specimens were cast and tested, with three of these specimens acting as reference specimens and the remaining specimens wrapped with different types of FRP (CFRP and GFRP) by different wrapping arrangements. They include fully wrapped, partially wrapped and non-uniformly wrapped concrete cylinders. The nonuniformly wrapped concrete cylinders provided higher compressive strengths and strain for FRP-confined concrete, in comparison with conventional fully wrapping arrangements. The effect of confinement level on the effectiveness of FRP confinement …

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Application Of Artificial Neural Network Coupled With Genetic Algorithm And Simulated Annealing To Solve Groundwater Inflow Problem To An Advancing Open Pit Mine, Saeed Bahrami, Faramarz Doulati Ardejani, Ernest Baafi Jan 2016

Application Of Artificial Neural Network Coupled With Genetic Algorithm And Simulated Annealing To Solve Groundwater Inflow Problem To An Advancing Open Pit Mine, Saeed Bahrami, Faramarz Doulati Ardejani, Ernest Baafi

Faculty of Engineering and Information Sciences - Papers: Part A

In this study, hybrid models are designed to predict groundwater inflow to an advancing open pit mine and the hydraulic head (HH) in observation wells at different distances from the centre of the pit during its advance. Hybrid methods coupling artificial neural network (ANN) with genetic algorithm (GA) methods (ANN-GA), and simulated annealing (SA) methods (ANN-SA), were utilised. Ratios of depth of pit penetration in aquifer to aquifer thickness, pit bottom radius to its top radius, inverse of pit advance time and the HH in the observation wells to the distance of observation wells from the centre of the pit …

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The Primitive Ideals Of Some Etale Groupoid C*-Algebras, Aidan Sims, Dana P. Williams Jan 2016

The Primitive Ideals Of Some Etale Groupoid C*-Algebras, Aidan Sims, Dana P. Williams

Faculty of Engineering and Information Sciences - Papers: Part A

We consider the Deaconu-Renault groupoid of an action of a finitely generated free abelian monoid by local homeomorphisms of a locally compact Hausdorff space. We catalogue the primitive ideals of the associated groupoid C∗-algebra. For a special class of actions we describe the Jacobson topology.

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Single Joint Robotic Orthoses For Gait Rehabilitation: An Educational Technical Review, Shahid Hussain, Prashant K. Jamwal, Mergen H. Ghayesh Jan 2016

Single Joint Robotic Orthoses For Gait Rehabilitation: An Educational Technical Review, Shahid Hussain, Prashant K. Jamwal, Mergen H. Ghayesh

Faculty of Engineering and Information Sciences - Papers: Part A

Robot-assisted physical gait therapy is gaining recognition among the rehabilitation engineering community. Several robotic orthoses for the treatment of gait impairments have been developed during the last 2 decades, many of which are designed to provide physical therapy to a single joint of the lower limb; these are reviewed here. The mechanism design and actuation concepts for these single joint robotic orthoses are discussed. The control algorithms developed for these robotic orthoses, which include trajectory tracking control and assist-as-needed control, are described. Finally, the mechanism design and control of single joint robotic orthoses are discussed. There is a strong need …

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Field Study Of Air Conditioning And Thermal Comfort In Residential Buildings, Jungsoo Kim, Richard De Dear, Tom Parkinson, Christhina Candido, Paul Cooper, Zhenjun Ma, Wasim Saman Jan 2016

Field Study Of Air Conditioning And Thermal Comfort In Residential Buildings, Jungsoo Kim, Richard De Dear, Tom Parkinson, Christhina Candido, Paul Cooper, Zhenjun Ma, Wasim Saman

Faculty of Engineering and Information Sciences - Papers: Part A

The aim of this study is to better understand the external and internal drivers that affect residential air-conditioning (A/C) use decisions and occupant comfort. Field observations were carried out using instrumental measurements and smartphone questionnaires, recording householder's A/C usage patterns, indoor/outdoor climatic factors, perception of thermal comfort and adaptive behaviours.

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Encoding And Communicating Navigable Speech Soundfields, Xiguang Zheng, Christian H. Ritz, Jiangtao Xi Jan 2016

Encoding And Communicating Navigable Speech Soundfields, Xiguang Zheng, Christian H. Ritz, Jiangtao Xi

Faculty of Engineering and Information Sciences - Papers: Part A

This paper describes a system for encoding and communicating navigable speech soundfields for applications such as immersive audio/visual conferencing, audio surveillance of large spaces and free viewpoint television. The system relies on recording speech soundfields using compact co-incident microphone arrays that are then processed to identify sources and their spatial location using the well-known assumption that speech signals are sparse in the time-frequency domain. A low-delay Direction of Arrival (DOA)-based frequency domain sound source separation approach is proposed that requires only 250 ms of speech signal. Joint compression is achieved through a previously proposed perceptual analysis-by-synthesis spatial audio coding scheme …

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High Intrinsic Sensitivity Etched Polymer Fiber Bragg Grating Pair For Simultaneous Strain And Temperature Measurements, Kishore Bhowmik, Gang-Ding Peng, Yanhua Luo, Eliathamby Ambikairajah, Vedran Lovric, William R. Walsh, Ginu Rajan Jan 2016

High Intrinsic Sensitivity Etched Polymer Fiber Bragg Grating Pair For Simultaneous Strain And Temperature Measurements, Kishore Bhowmik, Gang-Ding Peng, Yanhua Luo, Eliathamby Ambikairajah, Vedran Lovric, William R. Walsh, Ginu Rajan

Faculty of Engineering and Information Sciences - Papers: Part A

A sensing configuration for simultaneous measurement of strain and temperature with enhanced intrinsic sensitivity based on a fiber Bragg grating (FBG) pair with one grating inscribed in the etched and the other in unetched polymer fiber region is demonstrated. A poly (methyl methacrylate) based single-mode polymer fiber is etched to different diameters, and it is observed that etching can lead to change in the material properties of the fiber, such as Young's modulus and thermal expansion coefficient, which can play a vital role in improving its intrinsic sensing capabilities. Thus, exploiting the different strain and temperature sensitivities exhibited by etched …

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Nonlocal Transistor Based On Pure Crossed Andreev Reflection In A Euo-Graphene/Superconductor Hybrid Structure, Yee Sin Ang, Lawrence Ang, C Zhang, Zhongshui Ma Jan 2016

Nonlocal Transistor Based On Pure Crossed Andreev Reflection In A Euo-Graphene/Superconductor Hybrid Structure, Yee Sin Ang, Lawrence Ang, C Zhang, Zhongshui Ma

Faculty of Engineering and Information Sciences - Papers: Part A

We study the interband transport in a superconducting device composed of graphene with EuO-induced exchange interaction. We show that pure crossed Andreev reflection can be generated exclusively without the parasitic local Andreev reflection and elastic cotunnelling over a wide range of bias and Fermi levels in an EuO-graphene/superconductor/EuO-graphene device. The pure nonlocal conductance exhibits rapid on-off switching and oscillatory behavior when the Fermi levels in the normal and the superconducting leads are varied. The oscillation reflects the quasiparticle propagation in the superconducting lead and can be used as a tool to probe the subgap quasiparticle mode in superconducting graphene, which …

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Performance Of High Strength Concrete Columns Reinforced With Hybrid Steel Fiber Under Different Loading Conditions, Emdad K. Z Balanji, M Neaz Sheikh, Muhammad N. S Hadi Jan 2016

Performance Of High Strength Concrete Columns Reinforced With Hybrid Steel Fiber Under Different Loading Conditions, Emdad K. Z Balanji, M Neaz Sheikh, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part A

The strength and ductility of high strength concrete columns improve with the addition of steel fiber. This paper reports the behavior of circular High Strength Concrete (HSC) columns reinforced with Hybrid Steel Fibers (HSF) under different loading conditions. In this study, HSF consisted of a combination of macro steel fibers and micro steel fibers. A total of eight circular specimens of 205 mm diameter and 800 mm height were cast and tested. All specimens were reinforced with same amount of steel reinforcements. The specimens were divided into two groups of four specimens. Group RC (reference group) contained no steel fibers. …

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An Alternative Form Used To Calibrate The Heston Option Pricing Model, Xin-Jiang He, Song-Ping Zhu Jan 2016

An Alternative Form Used To Calibrate The Heston Option Pricing Model, Xin-Jiang He, Song-Ping Zhu

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents an alternative form of the Heston model that preserves an essential advantage of the Heston model, its analytic tractability, by imposing the necessary and sufficient conditions for the existence of a solution in affine form, while it is in a different form so that it offers certain advantages in parameter determination. To demonstrate this, we conducted some empirical studies, exploring if this new form does have certain advantages over the original version under certain market conditions.

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Spatial And Temporal Antarctic Ice Sheet Mass Trends, Glacio-Isostatic Adjustment, And Surface Processes From A Joint Inversion Of Satellite Altimeter, Gravity, And Gps Data, Alba Martín-Español, Andrew Zammit-Mangion, Peter J. Clarke, Thomas Flament, Veit Helm, Matt A. King, Scott B. Luthcke, Elizabeth Petrie, Frederique Rémy, Nana Schön, Bert Wouters, Jonathan Bamber Jan 2016

Spatial And Temporal Antarctic Ice Sheet Mass Trends, Glacio-Isostatic Adjustment, And Surface Processes From A Joint Inversion Of Satellite Altimeter, Gravity, And Gps Data, Alba Martín-Español, Andrew Zammit-Mangion, Peter J. Clarke, Thomas Flament, Veit Helm, Matt A. King, Scott B. Luthcke, Elizabeth Petrie, Frederique Rémy, Nana Schön, Bert Wouters, Jonathan Bamber

Faculty of Engineering and Information Sciences - Papers: Part A

The Authors. We present spatiotemporal mass balance trends for the Antarctic Ice Sheet from a statistical inversion of satellite altimetry, gravimetry, and elastic-corrected GPS data for the period 2003-2013. Our method simultaneously determines annual trends in ice dynamics, surface mass balance anomalies, and a time-invariant solution for glacio-isostatic adjustment while remaining largely independent of forward models. We establish that over the period 2003-2013, Antarctica has been losing mass at a rate of -84 ± 22 Gt yr-1, with a sustained negative mean trend of dynamic imbalance of -111 ± 13 Gt yr-1. West Antarctica is the largest contributor with -112 …

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Bring Your Own Device: An Overview Of Risk Assessment, Robert Ogie Jan 2016

Bring Your Own Device: An Overview Of Risk Assessment, Robert Ogie

Faculty of Engineering and Information Sciences - Papers: Part A

As organizations constantly strive to improve strategies for ICT management, one of the major challenges they must tackle is bring your own device (BYOD). BYOD is a term that collectively refers to the related technologies, concepts, and policies in which employees are allowed to access internal corporate IT resources, such as databases and applications, using their personal mobile devices like smartphones, laptop computers, and tablet PCs [1]. It is a side effect of the consumerization of IT, a term used to describe the growing tendency of the new information technologies to emerge first in the consumer market and then spread …

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Presenting Traveller Preference Heterogeneity In The Context Of Agency Theory: Understanding And Minimising The Agency Problem, Ahm Mehbub Anwar Jan 2016

Presenting Traveller Preference Heterogeneity In The Context Of Agency Theory: Understanding And Minimising The Agency Problem, Ahm Mehbub Anwar

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper agency theory has been used to interpret traveller preference heterogeneity in mode choice to understand agency problems. An agency problem is defined as a principal’s dissatisfaction with the outcome of an agent’s performance. Sydney statistical division travellers are considered as the principal and Transport for NSW (TfNSW) is treated as the agent. An agent performs the tasks that are delegated by the principal and thus a metaphoric contract is developed between them and travellers, for instance, show their satisfaction with the reliability and comfort of the transport service. TfNSW is expected to satisfy travellers’ desired services. Therefore, …

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On The Accuracy Of Dose Prediction Near Metal Fixation Devices For Spine Sbrt, Zhangkai J. Cheng, Regina M. Bromley, Bradley M. Oborn, Martin Carolan, Jeremy T Booth Jan 2016

On The Accuracy Of Dose Prediction Near Metal Fixation Devices For Spine Sbrt, Zhangkai J. Cheng, Regina M. Bromley, Bradley M. Oborn, Martin Carolan, Jeremy T Booth

Faculty of Engineering and Information Sciences - Papers: Part A

The metallic fixations used in surgical procedures to support the spine mechanically usually consist of high-density materials. Radiation therapy to palliate spinal cord compression can include prophylactic inclusion of potential tumor around the site of such fixation devices. Determination of the correct density and shape of the spine fixation device has a direct effect on the dose calculation of the radiation field. Even with the application of modern computed tomography (CT), under- or overestimation of dose, both immediately next to the device and in the surrounding tissues, can occur due to inaccuracies in the dose prediction algorithm. In this study, …

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Radar Imaging Of Stationary Indoor Targets Using Joint Low-Rank And Sparsity Constraints, Van Ha Tang, Abdesselam Bouzerdoum, Son Lam Phung, Fok Hing Chi Tivive Jan 2016

Radar Imaging Of Stationary Indoor Targets Using Joint Low-Rank And Sparsity Constraints, Van Ha Tang, Abdesselam Bouzerdoum, Son Lam Phung, Fok Hing Chi Tivive

Faculty of Engineering and Information Sciences - Papers: Part A

This paper introduces a joint low-rank and sparsity-based model to address the problem of wall-clutter mitigation in compressed through-the-wall radar imaging. The proposed model is motivated by two observations that wall reflections reside in a low-rank subspace, and target signals tend to be sparse. In the proposed approach, the task of segregating target returns from wall reflections is formulated as a joint low-rank and sparsity constrained optimization problem. Here, the low rank constraint is imposed on the wall component and the sparsity constraint is used to model the target component. An iterative soft thresholding algorithm is developed to estimate a …

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Variational Inference For Infinite Mixtures Of Sparse Gaussian Processes Through Kl-Correction, Thi Nhat Anh Nguyen, Abdesselam Bouzerdoum, Son Lam Phung Jan 2016

Variational Inference For Infinite Mixtures Of Sparse Gaussian Processes Through Kl-Correction, Thi Nhat Anh Nguyen, Abdesselam Bouzerdoum, Son Lam Phung

Faculty of Engineering and Information Sciences - Papers: Part A

We propose a new approximation method for Gaussian process (GP) regression based on the mixture of experts structure and variational inference. Our model is essentially an infinite mixture model in which each component is composed of a Gaussian distribution over the input space, and a Gaussian process expert over the output space. Each expert is a sparse GP model augmented with its own set of inducing points. Variational inference is made feasible by assuming that the training outputs are independent given the inducing points. In previous works on variational mixture of GP experts, the inducing points are selected through a …

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