Identity-Based Multisignature With Message Recovery,
2013
University of Wollongong
Identity-Based Multisignature With Message Recovery, Kefeng Wang, Yi Mu, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
We present a new notion of short identity-based multisignature scheme with message recovery. We propose a concrete identity-based multisignature with message recovery scheme based on bilinear pairing in which multiple signers can generate a constant size multisignature on same message regardless of the number of signers. There is no requirement to transmit the original message to the verifier, since the original message can be recovered from the multisignature. Therefore, this scheme minimizes the total length of the original message and the appended multisignature. The proposed scheme is proven to be existentially unforgeable against adaptively chosen message attacks in the random …
A Unique Sandwich-Structured C/Ge/Graphene Nanocomposite As An Anode Material For High Power Lithium Ion Batteries,
2013
University of Wollongong
A Unique Sandwich-Structured C/Ge/Graphene Nanocomposite As An Anode Material For High Power Lithium Ion Batteries, Dan Li, Kuok H. Seng, Dongqi Shi, Zhixin Chen, Hua-Kun Liu, Zaiping Guo
Faculty of Engineering and Information Sciences - Papers: Part A
A unique sandwich-structured C/Ge/graphene composite with germanium nanoparticles trapped between graphene sheets is prepared by a microwave-assisted solvothermal reaction followed by carbon coating and thermal reduction. The graphene sheets are found to be effective in hindering the growth and aggregation of GeO2 nanoparticles. More importantly, the graphene sheets, coupled with the carbon coating, can buffer the volume changes of germanium in electrochemical lithium reactions. The unique sandwich structure features a highly conductive network of carbon, which can improve both the conductivity and the structural stability of the electrode material, and exemplifies a promising strategy for the development of new high …
Cost-Sensitive Cascade Graph Neural Networks,
2013
University of Wollongong
Cost-Sensitive Cascade Graph Neural Networks, Nguyen Van Tuc, Ah Chung Tsoi, Markus Hagenbuchner
Faculty of Engineering and Information Sciences - Papers: Part A
This paper introduces a novel cost sensitive weighted samples approach to a cascade of Graph Neural Networks for learning from imbalanced data in the graph structured input domain. This is shown to be very effective in addressing the effects of imbalanced data distribution on learning systems. The proposed idea is based on a weighting mechanism which forces the network to encode misclassified graphs (or nodes) more strongly. We evaluate the approach through an application to the well known Web spam detection problem, and demonstrate that the general-ization performance is improved as a result. Indeed the results obtained reported in this …
Rectifying Differences In Transport, Dynamic, And Quasi-Equilibrium Measurements Of Critical Current Density,
2013
University of Wollongong
Rectifying Differences In Transport, Dynamic, And Quasi-Equilibrium Measurements Of Critical Current Density, I A. Golovchanskiy, A V. Pan, O V. Shcherbakova, S A. Fedoseev
Faculty of Engineering and Information Sciences - Papers: Part A
The dependence of the critical current density (Jc ) on electric field criteria (E cr) is studied for high-quality YBCO (YBa2Cu3O7) thin films over the entire applied magnetic field (Ba) range. The quantitative model describing the Jc(Ba) dependence is compared and explained for the critical current densities obtained by different measurement techniques. Transport current and quasi-equilibrium magnetization measurement data can successfully be fitted by the model with appropriate electric field criteria. The dependence of the irreversibility field on the E cr criterion can be obtained within …
A Classification Theorem For Helfrich Surfaces,
2013
University of Wollongong
A Classification Theorem For Helfrich Surfaces, James Mccoy, Glen Wheeler
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper we study the functional W , which is the the sum of the Willmore energy, weighted surface area, and weighted volume, for surfaces immersed in R^3. This coincides with the Helfrich functional with zero `spontaneous curvature'. Our main result is a complete classification of all smooth immersed critical points of the functional with nonnegative surface area weight and small L^2 norm of tracefree curvature. In particular we prove the non-existence of critical points of the functional for which the surface area and enclosed volume are positively weighted.
Magnetorheological Elastomers And Their Applications,
2013
University of Wollongong
Magnetorheological Elastomers And Their Applications, W H. Li, X Z. Zhang, H Du
Faculty of Engineering and Information Sciences - Papers: Part A
Magnetorheological elastomers (MRE) are smart materials whose modulus or mechanical performances can be controlled by an external magnetic field. In this chapter, the current research on the MRE materials fabrication, performance characterisation, modelling and applications is reviewed and discussed. Either anistropic or isotropic or MRE materials are fabricated by different curing conditions where magnetic field is applied or not. Anistropic MREs exhibit higher MR effects than isotropic MREs. Both steady-state and dynamic performances were studied through both experimental and theoretical approaches. The modelling approaches were developed to predict mechanical performances of MREs with both simple and complex structures. The sensing …
Self-Adaptation-Based Dynamic Coalition Formation In A Distributed Agent Network: A Mechanism And A Brief Survey,
2013
University of Wollongong
Self-Adaptation-Based Dynamic Coalition Formation In A Distributed Agent Network: A Mechanism And A Brief Survey, Dayong Ye, Minjie Zhang, Danny Sutanto
Faculty of Engineering and Information Sciences - Papers: Part A
In some real systems, e.g., distributed sensor networks, individual agents often need to form coalitions to accomplish complex tasks. Due to communication and computation constraints, it is infeasible for agents to directly interact with all other agents to form coalitions. Most previous coalition formation studies, however, overlooked this aspect. Those studies did not provide an explicitly modeled agent network or assumed that agents were in a fully connected network, where an agent can directly communicate with all other agents. Thus, to alleviate this problem, it is necessary to provide a neighborhood network structure, within which agents can directly interact only …
Effects Of Tungsten Addition And Heat Treatment Conditions On Microstructure And Mechanical Properties Of Microalloyed Forging Steels,
2013
University of Wollongong
Effects Of Tungsten Addition And Heat Treatment Conditions On Microstructure And Mechanical Properties Of Microalloyed Forging Steels, Jingwei Zhao, Zhengyi Jiang, Chong Soo Lee
Faculty of Engineering and Information Sciences - Papers: Part A
In the present work, the effects of tungsten (W) addition and heat treatment conditions on the microstructure, impact toughness and tensile properties of microalloyed forging steels were studied. Four kinds of microalloyed forging steels were produced by varying W additions (0, 0.5, 1 and 2 wt%). Heat treatment was carried out at temperatures ranging from 840 to 950 °C followed by air and furnace cooling. Mechanical tests were used to evaluate the room temperature Charpy impact and tensile properties. The resulting microstructures were analysed via optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show …
Enhancing Impact Fracture Toughness And Tensile Properties Of A Microalloyed Cast Steel By Hot Forging And Post-Forging Heat Treatment Processes,
2013
University of Wollongong
Enhancing Impact Fracture Toughness And Tensile Properties Of A Microalloyed Cast Steel By Hot Forging And Post-Forging Heat Treatment Processes, Jingwei Zhao, Zhengyi Jiang, Chong Soo Lee
Faculty of Engineering and Information Sciences - Papers: Part A
In the present work, the effects of hot forging and post-forging heat treatment on the impact fracture toughness and tensile properties of a microalloyed cast steel were investigated. Mechanical tests were used to evaluate the room temperature impact fracture toughness and tensile properties of the steel. The resulting microstructures were analysed by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The extraction replica technology was used to investigate the characterisation of complex precipitates formed during heat treatment. The obtained results showed that the coarse-grained microstructure of the forged specimen was significantly refined after post-forging heat treatment. …
Modeling The Internal Erosion Behavior Of Lignosulfonate Treated Soil,
2013
University of Wollongong
Modeling The Internal Erosion Behavior Of Lignosulfonate Treated Soil, Rasika Athukorala, Buddhima Indraratna, Jayan S. Vinod
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents the development of an analytical model to predict the erosion rate of stabilised soil based on the law of conservation of energy. The model incorporates the strain energy intensity until failure, obtained from the stress-strain curves of lignosulfonate treated soil, to account for the stabilisation. The novel approach of this model is to correlate the shear strength characteristics with the erosion resistance. The proposed equation was used to predict the erosion rates of a non-plastic silty sand treated with lignosulfonate. The erosion resistance was interpreted in terms of the coefficient of soil erosion and the critical shear …
On The Weighting Of The Mean-Absolute-Deviation Cost Minimization Model,
2013
National University of Singapore
On The Weighting Of The Mean-Absolute-Deviation Cost Minimization Model, S Wang, Q Meng, Z Liu
Faculty of Engineering and Information Sciences - Papers: Part A
The mean-absolute-deviation cost minimization model, which aims to minimize sum of the mean value and the absolute deviation (AD) of the total cost multiplied by a given non-negative weighting, is one of a number of typical robust optimization models. This paper first uses a straightforward example to show that the solution obtained by this model with some weightings is not actually an optimal decision. This example also illustrates that the mean-absolute-deviation cost minimization model cannot be regarded as the conventional weighted transformation of the relevant multiobjective minimization model aiming to simultaneously minimize the mean value and AD. This paper further …
Strength And Bonding In Reduced Ironsand-Coal Compacts,
2013
University of Wollongong
Strength And Bonding In Reduced Ironsand-Coal Compacts, R J. Longbottom, B J. Monaghan, S A. Nightingale, J G. Mathieson
Faculty of Engineering and Information Sciences - Papers: Part A
In this investigation, the strength and bonding within reduced ironsand-coal compacts were studied, with the aim of better understanding the binding mechanisms in the reduced compacts and, based on this understanding, to improve their strength. Ironsand ore and sub-bituminous coal were mixed and pressed into compacts, which were reduced by heating in a thermogravimetric furnace to temperatures between 1273 and 1573 K under argon. The progress of the reaction was monitored by measuring the weight loss with time. The reduced compacts were found to have low strength in compression testing. The main form of bonding between the reduced ironsand particles …
Enhancing Mechanical Properties Of A Low-Carbon Microalloyed Cast Steel By Controlled Heat Treatment,
2013
University of Wollongong
Enhancing Mechanical Properties Of A Low-Carbon Microalloyed Cast Steel By Controlled Heat Treatment, Jingwei Zhao, Jeong Hun Lee, Yong Woo Kim, Zhengyi Jiang, Chong Soo Lee
Faculty of Engineering and Information Sciences - Papers: Part A
In the present work, detailed studies were made on the optimization of microstructure and mechanical properties of a low-carbon microalloyed cast steel through control of heat treatment conditions. Specimens were austenitized at temperatures ranging from 950 to 1200 °C for 2 h followed by different cooling methods (furnace, air and water). For analyzing the effect of holding time on mechanical properties, some cast specimens were austenitized at 1100 °C for different times followed by furnace cooling. After heat treatment, mechanical tests were employed to evaluate the room temperature Charpy impact and tensile properties. The characterization of complex precipitates formed during …
Strong Amicable Orthogonal Designs And Amicable Hadamard Matrices,
2013
University of Wollongong
Strong Amicable Orthogonal Designs And Amicable Hadamard Matrices, Jennifer Seberry
Faculty of Engineering and Information Sciences - Papers: Part A
Amicable orthogonal designs have renewed interest because of their use in mobile communications. We show the existence of strong amicable orthogonal designs, AOD(n: 1, n - 1; 1, n - 1), for n = pr + 1, p ≡ 3 (mod 4) a prime and for n = 2r, n a non-negative integer in a form more suitable for communications. Unfortunately the existence of amicable Hadamard matrices is not enough to demonstrate the existence of strong amicable orthogonal designs.
Speed-Based Toll Design For Cordon-Based Congestion Pricing Scheme,
2013
Monash University
Speed-Based Toll Design For Cordon-Based Congestion Pricing Scheme, Zhiyuan Liu, Qiang Meng, Shuaian Wang
Faculty of Engineering and Information Sciences - Papers: Part A
The cordon-based Electronic Road Pricing (ERP) system in Singapore adopts the average travel speed as an index for evaluating the traffic congestion within a cordon area, and the maintenance of the average travel speed within a satisfactory range is taken as the objective of the toll adjustment. To formulate this practical speed-based toll design problem, this paper proposes a mathematical programming with equilibrium constraint (MPEC) model with the objective of maintaining the traffic condition in the cordon area. In the model, the network users' route choice behavior is assumed to follow probit-based stochastic user equilibrium with elastic demand, asymmetric link …
Predicting Additive And Non-Additive Genetic Effects From Trials Where Traits Are Affected By Interplot Competition,
2013
Queensland Department of Agriculture
Predicting Additive And Non-Additive Genetic Effects From Trials Where Traits Are Affected By Interplot Competition, Colleen H. Hunt, Alison B. Smith, David R. Jordan, Brian R. Cullis
Faculty of Engineering and Information Sciences - Papers: Part A
There are two key types of selection in a plant breeding program, namely selection of hybrids for potential commercial use and the selection of parents for use in future breeding. Oakey et al. (in Theoretical and Applied Genetics 113, 809-819, 2006) showed how both of these aims could be achieved using pedigree information in a mixed model analysis in order to partition genetic effects into additive and non-additive effects. Their approach was developed for field trial data subject to spatial variation. In this paper we extend the approach for data from trials subject to interplot competition. We show how the …
Modelling Microbial Growth In A Closed Environment,
2013
University of Wollongong
Modelling Microbial Growth In A Closed Environment, Maureen P. Edwards, Ulrike Schumann, Robert S. Anderssen
Faculty of Engineering and Information Sciences - Papers: Part A
The formulation of models for the growth of microbes (fungi; bacteria) must not only take account of the current number of the microbes but also of the effect of the environment in which the growth is occurring and of the type of measurements used to record the growth. In industrial processes, the effect of physiological (morphological) changes on the growth must be taken into account. When growth is occurring in an open environment which achieves an equilibrium (e.g. balancing growth and harvesting) and is measured as the time evolution of the total number of microbes present (alive and dead), autonomous …
Utilising Confinement Reinforcement For Shear Resistance In Reinforced Concrete Structures,
2013
University of Wollongong
Utilising Confinement Reinforcement For Shear Resistance In Reinforced Concrete Structures, Kamal Jaafar
Faculty of Engineering and Information Sciences - Papers: Part A
Common transverse reinforcement of reinforced concrete members with circular cross-section consists of round ties or spirals. Its purpose in members that are not subjected to significant shear loading is to provide proper confinement for concrete, and eliminate buckling of the longitudinal reinforcement bars. If spirals are to be used as both shear enabler and confiner for reinforced concrete beams then, under combined action of moment and shear, spirals will be required to provide or contribute to proper shear resistance. Hence, a proper assessment for spiral shear contribution is required. The validity of concepts which underline current methods for shear design …
Modeling Dense-Phase Pneumatic Conveying Of Powders Using Suspension Density,
2013
Thapar University
Modeling Dense-Phase Pneumatic Conveying Of Powders Using Suspension Density, S S. Mallick, P W. Wypych, R Pan
Faculty of Engineering and Information Sciences - Papers: Part A
This article presents results of an investigation into the modeling of pressure drop in horizontal straight pipe section for fluidized dense-phase pneumatic conveying of powders. Suspension density and superficial air velocity have been used to model pressure drop for two-phase solids-gas flow. Two applicable models formats (developed by other researchers using two different definitions of suspension density) were used to represent the pressure drop due to solids-gas flow through straight pipe sections. Models were generated based on the test data of conveying power-station fly ash and electrostatic precipitator (ESP) dust (median particle diameter: 30 and 7 µm; particle density: 2300 …
Mechanical Properties Of Al-Mg-Si Alloy Sheets Produced Using Asymmetric Cryorolling And Ageing Treatment,
2013
University of Wollongong
Mechanical Properties Of Al-Mg-Si Alloy Sheets Produced Using Asymmetric Cryorolling And Ageing Treatment, Hai-Liang Yu, A Kiet Tieu, Cheng Lu, Xiang-Hua Liu, Ajit Godbole, Charlie Kong
Faculty of Engineering and Information Sciences - Papers: Part A
An asymmetric cryorolling technique was used to reduce the thickness of an Al-Mg-Si alloy sheet from 1.5 mm to 0.19 mm. The samples were subsequently aged for 48 h at 100 degrees celcius. The hardness and tensile strength of both rolled and aged sheets increased with the number of passes up to the sixth pass, but the tensile stress decreased after the seventh pass. Investigation of the microstructure of the sheets showed that the grain size after seven passes was about 235 nm and revealed the presence of Fe-Cr-Mn-Si particles in the samples. The deformation of Fe-Cr-Mn-Si particles and sheet …
