ORCID Profile
0000-0001-8791-9068
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Civil Engineering | Infrastructure Engineering and Asset Management | Structural Engineering |
Urban and Industrial Water Management | Civil Construction Design
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 02-2020
Publisher: Wiley
Date: 15-03-2005
DOI: 10.1002/CNM.754
Publisher: Elsevier BV
Date: 04-2010
Publisher: Elsevier BV
Date: 12-2018
Publisher: SPIE
Date: 08-02-2007
DOI: 10.1117/12.698881
Publisher: Elsevier BV
Date: 2007
DOI: 10.1016/J.JBIOMECH.2006.10.027
Abstract: With advances in tissue engineering and improvement of surgical techniques, stentless biological valves and valve-sparing procedures have become alternatives to traditional aortic valve replacement with stented bioprostheses or mechanical valves. New surgical techniques preserve the advantages of native valves but require better understanding of the anatomical structure of the aortic root. Silicone rubber was injected in fresh aortic roots of nine human cadavers under the physiological closing pressure of 80 mmHg. The casts reproduced every detail of the aortic root anatomy and were used to digitize 27 leaflet attachment lines (LALs) of the aortic valves. LALs were normalized and described with a mathematical model. LALs were found to follow a pattern with the right coronary being the largest followed by the non-coronary and then the left coronary. During diastole, the aortic valve LAL can be described by an intersection between a created tube and an extruded parabolic surface. This geometrical definition of the LAL during end diastole gives a better understanding of the aortic root anatomy and could be useful for heart valve design and improvement of aortic valve reconstruction technique.
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 03-2010
Publisher: Springer Science and Business Media LLC
Date: 13-05-2022
Publisher: Emerald
Date: 05-06-2007
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 02-2023
Publisher: Wiley
Date: 10-07-2007
DOI: 10.1002/CNM.1026
Publisher: Elsevier BV
Date: 06-2014
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 2015
Publisher: Springer Science and Business Media LLC
Date: 24-01-2015
Publisher: Wiley
Date: 03-08-2004
DOI: 10.1002/NME.1056
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 07-2013
Publisher: Elsevier BV
Date: 2011
Publisher: Wiley
Date: 20-03-2012
DOI: 10.1002/NME.4284
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 06-2023
Publisher: Springer Science and Business Media LLC
Date: 28-07-2013
Publisher: Elsevier BV
Date: 10-2021
Publisher: Springer Science and Business Media LLC
Date: 27-03-2020
Publisher: Wiley
Date: 26-02-2018
DOI: 10.1002/NME.5770
Publisher: Elsevier BV
Date: 03-2022
Publisher: Wiley
Date: 21-07-2019
DOI: 10.1002/NME.6146
Publisher: Elsevier BV
Date: 10-2022
Publisher: Wiley
Date: 05-05-2016
DOI: 10.1002/NME.5259
Publisher: Elsevier BV
Date: 07-2019
DOI: 10.1016/J.CMPB.2019.04.028
Abstract: Recently, there have been calls for RFA to be implemented in the bipolar mode for cancer treatment due to the benefits it offers over the monopolar mode. These include the ability to prevent skin burns at the grounding pad and to avoid tumour track seeding. The usage of bipolar RFA in clinical practice remains uncommon however, as not many research studies have been carried out on bipolar RFA. As such, there is still uncertainty in understanding the effects of the different RF probe configurations on the treatment outcome of RFA. This paper demonstrates that the electrode lengths have a strong influence on the mechanics of bipolar RFA. The information obtained here may lead to further optimization of the system for subsequent uses in the hospitals. A 2D model in the axisymmetric coordinates was developed to simulate the electro-thermophysiological responses of the tissue during a single probe bipolar RFA. Two different probe configurations were considered, namely the configuration where the active electrode is longer than the ground and the configuration where the ground electrode is longer than the active. The mathematical model was first verified with an existing experimental study found in the literature. Results from the simulations showed that heating is confined only to the region around the shorter electrode, regardless of whether the shorter electrode is the active or the ground. Consequently, thermal coagulation also occurs in the region surrounding the shorter electrode. This opened up the possibility for a better customized treatment through the development of RF probes with adjustable electrode lengths. The electrode length was found to play a significant role on the outcome of single probe bipolar RFA. In particular, the length of the shorter electrode becomes the limiting factor that influences the mechanics of single probe bipolar RFA. Results from this study can be used to further develop and optimize bipolar RFA as an effective and reliable cancer treatment technique.
Publisher: Wiley
Date: 21-07-2015
DOI: 10.1002/NME.4965
Publisher: Elsevier BV
Date: 11-2021
Publisher: Springer Science and Business Media LLC
Date: 24-07-2017
Publisher: Wiley
Date: 19-02-2014
DOI: 10.1002/NME.4645
Publisher: World Scientific Pub Co Pte Lt
Date: 10-05-2021
DOI: 10.1142/S0219876220410078
Abstract: In this paper, an adaptive phase-field scaled boundary finite element method for fracture in functionally graded material (FGM) is presented. The model accounts for spatial variation in the material and fracture properties. The quadtree decomposition is adopted for refinement, and the refinement is based on an error indicator evaluated directly from the solutions of the scaled boundary finite element method. This combination makes it a suitable choice to study fracture using the phase field method, as it reduces the mesh burden. A few standard benchmark numerical ex les are solved to demonstrate the improvement in computational efficiency in terms of the number of degrees of freedom.
Publisher: Springer Singapore
Date: 02-12-2017
Publisher: Elsevier BV
Date: 07-2007
Publisher: Elsevier BV
Date: 06-2022
DOI: 10.1016/J.COMPBIOMED.2022.105494
Abstract: Thermochemical ablation (TCA) is a thermal ablation therapy that utilises heat released from acid-base neutralisation reaction to destroy tumours. This procedure is a promising low-cost solution to existing thermal ablation treatments such as radiofrequency ablation (RFA) and microwave ablation (MWA). Studies have demonstrated that TCA can produce thermal damage that is on par with RFA and MWA when employed properly. Nevertheless, TCA remains a concept that is tested only in a few animal trials due to the risks involved as the result of uncontrolled infusion and incomplete acid-base reaction. In this study, a computational framework that simulates the thermochemical process of TCA is developed. The proposed framework consists of three physics, namely chemical flow, neutralisation reaction and heat transfer. An important parameter in the TCA framework is the neutralisation reaction rate constant, which has values in the order of 10
Publisher: Elsevier BV
Date: 07-2011
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 02-2020
DOI: 10.1016/J.CMPB.2019.105289
Abstract: The majority of the studies on radiofrequency ablation (RFA) have focused on enlarging the size of the coagulation zone. An aspect that is crucial but often overlooked is the shape of the coagulation zone. The shape is crucial because the majority of tumours are irregularly-shaped. In this paper, the ability to manipulate the shape of the coagulation zone following saline-infused RFA by altering the location of saline infusion is explored. A 3D model of the liver tissue was developed. Saline infusion was described using the dual porosity model, while RFA was described using the electrostatic and bioheat transfer equations. Three infusion locations were investigated, namely at the proximal end, the middle and the distal end of the electrode. Investigations were carried out numerically using the finite element method. Results indicated that greater thermal coagulation was found in the region of tissue occupied by the saline bolus. Infusion at the middle of the electrode led to the largest coagulation volume followed by infusion at the proximal and distal ends. It was also found that the ability to delay roll-off, as commonly associated with saline-infused RFA, was true only for the case when infusion is carried out at the middle. When infused at the proximal and distal ends, the occurrence of roll-off was advanced. This may be due to the rapid and more intense heating experienced by the tissue when infusion is carried out at the electrode ends where Joule heating is dominant. Altering the location of saline infusion can influence the shape of the coagulation zone following saline-infused RFA. The ability to 'shift' the coagulation zone to a desired location opens up great opportunities for the development of more precise saline-infused RFA treatment that targets specific regions within the tissue.
Publisher: Elsevier BV
Date: 03-2018
Publisher: The Electrochemical Society
Date: 02-2022
Abstract: The polygonal finite element method (PFEM) is proposed as a fast and accurate technique to simulate the impedance spectroscopy (IS) of polycrystalline materials. While conventional finite element method (FEM) requires explicit meshing of the grains and grain boundaries, in PFEM each region can be treated as an element. We demonstrate that the number of degrees of freedom in PFEM can be lower by a factor of 30 when compared to FEM, thus speeding up simulations by a factor of 3.5. A simple ex le demonstrates the use of PFEM to generate IS on s les with various grain boundary widths.
Publisher: Springer Science and Business Media LLC
Date: 29-12-2022
Publisher: Elsevier BV
Date: 10-2012
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 11-2021
Publisher: Informa UK Limited
Date: 28-02-2018
DOI: 10.1080/02656736.2018.1437282
Abstract: A recent study by Ooi and Ooi (EH Ooi, ET Ooi, Mass transport in biological tissues: Comparisons between single- and dual-porosity models in the context of saline-infused radiofrequency ablation, Applied Mathematical Modelling, 2017, 41, 271-284) has shown that single-porosity (SP) models for describing fluid transport in biological tissues significantly underestimate the fluid penetration depth when compared to dual-porosity (DP) models. This has raised some concerns on whether the SP model, when coupled with models of radiofrequency ablation (RFA) to simulate saline-infused RFA, could lead to an underestimation of the coagulation size. This paper compares the coagulation volumes obtained following saline-infused RFA predicted based on the SP and DP models for fluid transport. Results showed that the SP model predicted coagulation zones that are consistently 0.5 to 0.9 times smaller than that of DP model. This may be explained by the low permeability value of the tissue interstitial space, which causes the majority of the saline to flow through the vasculature. The absence of fluid flow tracking in the vasculature in the SP model meant that any flow of saline into the vasculature is treated as losses and do not contribute to the saline penetration depth of the tissue. Comparisons with experimental results from the literature revealed that the DP models predicted coagulation zone sizes that are closer to the experimental values than the SP models. This supports the hypothesis that the SP model is a poor choice for simulating the outcome of saline-infused RFA.
Publisher: Wiley
Date: 07-09-2006
DOI: 10.1002/CNM.893
Publisher: SPIE
Date: 09-02-2006
DOI: 10.1117/12.642177
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 04-2020
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.719
Abstract: Crack propagation is modelled using scaled boundary polygons. The polygons discretise the computational domain and can be of any number of sides, leading to more flexible mesh generation. The scaled boundary finite element method is used to construct shape functions of the polygon elements. These shape functions form a partition of unity and are linearly complete. They can accurately model any kind of stress singularity without local mesh refinement or asymptotic enrichment functions. The scaled boundary shape functions enable the method to be further developed to model the response of heterogeneous and nonlinear materials. As the polygons can be of any number of sides, simple re-meshing algorithms can be devised to model crack propagation. Two numerical benchmarks are modeled to illustrate the salient features of the scaled boundary polygons.
Publisher: Wiley
Date: 15-05-2023
DOI: 10.1002/NME.7287
Abstract: A general technique to develop arbitrary‐sided polygonal elements based on the scaled boundary finite element method is presented. Shape functions are derived from the solution of the Poisson's equation in contrast to the well‐known Laplace shape functions that are only linearly complete. The application of the Poisson shape functions can be complete up to any specific order. The shape functions retain the advantage of the scaled boundary finite element method allowing direct formulation on polygons with arbitrary number of sides and quadtree meshes. The resulting formulation is similar to the finite element method where each field variable is interpolated by the same set of shape functions in parametric space and differs only in the integration of the stiffness and mass matrices. Well‐established finite element procedures can be applied with the developed shape functions, to solve a variety of engineering problems including, for ex le, coupled field problems, phase field fracture, and addressing volumetric locking in the near‐incompressibility limit by adopting a mixed formulation. Application of the formulation is demonstrated in several engineering problems. Optimal convergence rates are observed.
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.COMPBIOMED.2019.01.003
Abstract: Effects of different boundary conditions prescribed across the boundaries of radiofrequency ablation (RFA) models of liver cancer are investigated for the case where the tumour is at the liver boundary. Ground and Robin-type conditions (electrical field) and body temperature and thermal insulation (thermal field) conditions are examined. 3D models of the human liver based on publicly-available CT images of the liver are developed. An artificial tumour is placed inside the liver at the boundary. Simulations are carried out using the finite element method. The numerical results indicated that different electrical and thermal boundary conditions led to different predictions of the electrical potential, temperature and thermal coagulation distributions. Ground and body temperature conditions presented an unnatural physical conditions around the ablation site, which results in more intense Joule heating and excessive heat loss from the tissue. This led to thermal damage volumes that are smaller than the cases when the Robin type or the thermal insulation conditions are prescribed. The present study suggests that RFA simulations in the future must take into consideration the choice of the type of electrical and thermal boundary conditions to be prescribed in the case where the tumour is located near to the liver boundary.
Publisher: Elsevier BV
Date: 09-2018
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 04-2011
Publisher: Elsevier BV
Date: 12-1976
Publisher: Wiley
Date: 2021
Abstract: The paper presents a comparative study of the finite element method (FEM) and the scaled boundary finite element method (SBFEM) for the numerical evaluation of the volume‐averaged stress of composites. Two‐dimensional meso‐scale models of concrete represented by digital images and discretized using an automatic mesh generation algorithm are considered. The different computational approaches are discussed and compared with respect to accuracy and efficiency for both scenarios.
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 07-2021
Publisher: World Scientific Pub Co Pte Lt
Date: 03-2012
DOI: 10.1142/S0219876212400166
Abstract: This study reviews our recent efforts in the development and application of crack propagation modeling approaches based on the scaled boundary finite element method (SBFEM). These include models for linear and nonlinear, static and dynamic, and single and multiple crack propagation problems, and application to efficient prediction of deterministic size effect laws and complicated fracture behavior of reinforced concrete structures. The advantages and disadvantages of these approaches are compared with the FEM.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2022
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 08-2015
Publisher: Springer Science and Business Media LLC
Date: 02-08-2017
Publisher: Elsevier BV
Date: 04-2022
Publisher: Wiley
Date: 17-06-2019
DOI: 10.1002/NME.6095
Publisher: Elsevier BV
Date: 08-2017
Publisher: Wiley
Date: 16-05-2012
Publisher: Elsevier BV
Date: 07-2014
Publisher: Wiley
Date: 07-04-2011
DOI: 10.1002/NME.3177
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 02-2023
Publisher: Wiley
Date: 04-08-2022
DOI: 10.1002/NAG.3431
Abstract: Mine slope design is a complex task that requires consideration of geotechnical analysis, structural stability, economics and the environment. Economic factors usually drive mine slope design, particularly in the case of open‐pit designs, where the process of steepening slope walls by several degrees can have profound financial implications. Due to the risks associated with catastrophic slope collapse, slope stability analysis is an integral component of open‐pit engineering projects. However, initial design concepts and geotechnical assessments are often considered separately. In this study, a technique is developed that combines the scaled boundary finite element method (SBFEM) with genetic algorithms (GAs) to simultaneously perform slope stability analysis and optimise the slope profile. The iterative design approach optimises characteristics of the slope profile such as the slope height, width, angle and number of benches while ensuring the factor of safety (FoS) remains above a threshold value. A salient feature of the technique is the ability to automatically address the modifications to the geometry of the slope by updating the digital images used in the analysis to assess the stability of each instance in the optimisation process and determine the optimum slope geometry. The results highlight the application of the developed technique to determine appropriate slope excavation designs as well as slope backfilling scenarios. The method is exemplified in several cases where complex stratigraphies and spatially variable materials are considered. As such, the GA‐driven slope design process conveys an optimised, automated tool, combining mine slope design and slope stability analysis.
Publisher: Wiley
Date: 22-06-2020
DOI: 10.1002/CNM.3374
Publisher: Wiley
Date: 21-05-2018
DOI: 10.1002/NME.5832
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 07-2009
Publisher: Elsevier BV
Date: 03-2020
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 12-2017
End Date: 12-2023
Amount: $351,731.00
Funder: Australian Research Council
View Funded Activity