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Articles 1081 - 1110 of 2377
Full-Text Articles in Physical Sciences and Mathematics
Voltage Unbalance Emission Assessment In Radial Power Systems, U Jayatunga, S Perera, P Ciufo
Voltage Unbalance Emission Assessment In Radial Power Systems, U Jayatunga, S Perera, P Ciufo
Associate Professor Sarath Perera
Voltage unbalance (VU) emission assessment is an integral part in the VU-management process where loads are allocated a portion of the unbalance absorption capacity of the power system. The International Electrotechnical Commission Report IEC/TR 61000-3-13:2008 prescribes a VU emission allocation methodology establishing the fact that the VU can arise at the point of common connection (PCC) due to upstream network unbalance and load unbalance. Although this is the case for emission allocation, approaches for post connection emission assessment do not exist except for cases where the load is the only contributor to the VU at the PCC. Such assessment methods …
The Electrical Performance Of Modern Compact Fluorescent Lamps, Sean Elphick, Philip Ciufo, Sarath Perera
The Electrical Performance Of Modern Compact Fluorescent Lamps, Sean Elphick, Philip Ciufo, Sarath Perera
Associate Professor Sarath Perera
Compact Fluorescent Lamps (CFL) are highly non-linear devices which are likely to experience very high growth in penetration levels, especially in domestic environments, in Australia over the next 2 – 3 years. This will occur due to the decision taken by the Australian Federal Government to ban the sale of incandescent light globes after 2009 as measures towards meeting the needs for demand side management and climate change abatement. While CFL technology has been in existence since the late 1980s penetration levels are now increasing to a point where the total CFL load cannot be considered negligible compared to other …
Review Of Disturbance Emissions Assessment Techniques, D Arlt, H Bronzeado, R Cai, E De Jaeger, Z Emin, M Halpin, F Klein, I Papic, P Paranavithana, S Perera, H Renner, F Zavoda
Review Of Disturbance Emissions Assessment Techniques, D Arlt, H Bronzeado, R Cai, E De Jaeger, Z Emin, M Halpin, F Klein, I Papic, P Paranavithana, S Perera, H Renner, F Zavoda
Associate Professor Sarath Perera
No abstract provided.
The Analysis Of Utility Voltage Sag Data, Victor Gosbell, D Robinson, Sarath Perera
The Analysis Of Utility Voltage Sag Data, Victor Gosbell, D Robinson, Sarath Perera
Associate Professor Sarath Perera
No abstract provided.
Review Of Flicker Objectives For Lv, Mv And Hv Systems, Detmar Arlt, Herivelto Bronzeado, Rong Cai, Emmanuel De Jaeger, Zia Emin, David Guillot, Mark Halpin, Naoki Kobayashi, Matti Lahtinen, Igor Papic, Francisco Pazos, Sarath Perera, Jeremy Price, Herwig Renner, Xavier Yang, Francisc Zavoda
Review Of Flicker Objectives For Lv, Mv And Hv Systems, Detmar Arlt, Herivelto Bronzeado, Rong Cai, Emmanuel De Jaeger, Zia Emin, David Guillot, Mark Halpin, Naoki Kobayashi, Matti Lahtinen, Igor Papic, Francisco Pazos, Sarath Perera, Jeremy Price, Herwig Renner, Xavier Yang, Francisc Zavoda
Associate Professor Sarath Perera
No abstract provided.
Power Quality: Recommendations For The Application Of As/Nzs 61000.3.6 And As/Nzs 6100.3.7, Victor Gosbell, Sarath Perera, Victor Smith, D Robinson, Graeme Sanders
Power Quality: Recommendations For The Application Of As/Nzs 61000.3.6 And As/Nzs 6100.3.7, Victor Gosbell, Sarath Perera, Victor Smith, D Robinson, Graeme Sanders
Associate Professor Sarath Perera
No abstract provided.
Hydrogen Energy Storage For A Permanent Magnet Wind Turbine Generator Based Autonomous Hybrid Power System, Nishad Mendis, Saad Sayeef, Kashem Muttaqi, Sarath Perera
Hydrogen Energy Storage For A Permanent Magnet Wind Turbine Generator Based Autonomous Hybrid Power System, Nishad Mendis, Saad Sayeef, Kashem Muttaqi, Sarath Perera
Associate Professor Sarath Perera
The Performance of a novel hybrid Remote Area Power Supply (RAPS) system consisting of a Permanent Magnet Synchronous Generator (PMSG), fuel cell system, electrolyser and synchronous condenser is investigated in this paper. The fuel cell system is used to provide power during under-generation scenarios whereas the electrolyser absorbs excess power during over-generation conditions. A synchronous condenser is incorporated into the RAPS system to provide better reactive power and inertial support. Individual controllers for each system module have been developed and implemented. A control coordination methodology is established with a view to regulate the active and reactive power balance of the …
Automatic Detection Of Microcalcifications In Mammorgams Using A Fuzzy Classifier, Fazel Naghdy, Golshah Naghdy, Agustinus Drijarkara
Automatic Detection Of Microcalcifications In Mammorgams Using A Fuzzy Classifier, Fazel Naghdy, Golshah Naghdy, Agustinus Drijarkara
Associate Professor Golshah Naghdy
No abstract provided.
Objective Functional Capacity Assessment Using Inertial Sensor, David Stirling, Fazel Naghdy, Golshah Naghdy, M. Field, R. Arunglabi, D. Kilpatrick
Objective Functional Capacity Assessment Using Inertial Sensor, David Stirling, Fazel Naghdy, Golshah Naghdy, M. Field, R. Arunglabi, D. Kilpatrick
Associate Professor Golshah Naghdy
Functional capacity assessment is carried out to measure the functional limitations of a subject. While the clinical assessment can be validated against various standards, quantifying the assessment and achieving an objective, repeatable, and reliable score in the clinical assessment is a challenge. Current methods are subjective. The Progressive Iso inertial Lifting Evaluation (PILE) is a lifting test developed for functional capacity assessment. The primary aim of this study is to improve reliability and repeatability of PILE through objective measurement of patient's performance. This is achieved by recording and analysing the movement of a patient by a motion capture system based …
Morphological Characteristics Of Cervical Cells For Cervical Cancer Diagnosis, - Rahmadwati, Golshah Naghdy, Montserrat Ros, Catherine Todd
Morphological Characteristics Of Cervical Cells For Cervical Cancer Diagnosis, - Rahmadwati, Golshah Naghdy, Montserrat Ros, Catherine Todd
Associate Professor Golshah Naghdy
This paper investigates cervical cancer diagnosis based on the morphological characteristics of cervical cells. The developed algorithms cover several steps: pre-processing, image segmentation, nuclei and cytoplasm detection, feature calculation, and classification. The K-means clustering algorithm based on colour segmentation is used to segment cervical biopsy images into five regions: background, nuclei, red blood cell, stroma and cytoplasm. The morphological characteristics of cervical cells are used for feature extraction of cervical histopathology images. The cervical histopathology images are classified using four well known discriminatory features: 1) the ratio of nuclei to cytoplasm, 2) the diameter of nuclei, 3) the shape factor …
Performance Enhancement For Fuzzy Adaptive Resonance Theory (Art) Neural Networks, Golshah Naghdy, Jiazhao Wang, Philip Ogunbona
Performance Enhancement For Fuzzy Adaptive Resonance Theory (Art) Neural Networks, Golshah Naghdy, Jiazhao Wang, Philip Ogunbona
Associate Professor Golshah Naghdy
A modified fuzzy adaptive resonance theory neural network (ART) is used as a classifier for a texture recognition system. The system consists of a wavelet based low level feature detector and a high level ART classifier. The performance improvement is measured in terms of identification accuracy and computational burden.
3d Geometric And Haptic Modeling Of Hand-Woven Textile Artifacts, Hooman Shidanshidi, Fazel Naghdy, Golshah Naghdy, Diana Wood Conroy
3d Geometric And Haptic Modeling Of Hand-Woven Textile Artifacts, Hooman Shidanshidi, Fazel Naghdy, Golshah Naghdy, Diana Wood Conroy
Associate Professor Golshah Naghdy
Haptic Modeling of textile has attracted significant interest over the last decade. In spite of extensive research, no generic system has been proposed. The previous work mainly assumes that textile has a 2D planar structure. They also require time-consuming objective measurement of textile propel1ies in mechanicaVphysjcal model constrUction. A novel approach for haptic modeling of textile is proposed to overcome the existing shortcomings. The method is generic, assumes a 3D structure textile artifact, and deploys computational intelligence to estimate textile mechanical and physical properties. The approach is designed primarily for display of textile artifacts in museums. The haptic model is …
Assessment Of Distributed Generation Impacts On Distribution Networks Using Unbalanced Three-Phase Power Flow Analysis, Md Jan-E- Alam, Kashem Muttaqi, Danny Sutanto
Assessment Of Distributed Generation Impacts On Distribution Networks Using Unbalanced Three-Phase Power Flow Analysis, Md Jan-E- Alam, Kashem Muttaqi, Danny Sutanto
Associate Professor Kashem Muttaqi
Impacts of Distributed Generation (DG) resources on distribution networks have been studied. A Newton-Raphson algorithm based three phase unbalance power flow program has been developed to incorporate the effects of system unbalance and single phase DG injection. Power flow equations have been formulated and solved in phase coordinated form. Effects of substation load-tap changer, voltage regulator, shunt capacitor and different type of load models have been considered in the development of the program. Phase asymmetry of distribution networks has been treated by modifying the Jacobian matrix. The proposed technique has been tested on IEEE 34 bus distribution test system for …
A Short Length Window-Based Method For Islanding Detection In Distributed Generation, Mollah Alam, Kashem Muttaqi, Abdesselam Bouzerdoum
A Short Length Window-Based Method For Islanding Detection In Distributed Generation, Mollah Alam, Kashem Muttaqi, Abdesselam Bouzerdoum
Associate Professor Kashem Muttaqi
Distributed generation (DG) has recently drawn the interest to meet the increased load demand with minimum investment. But cohesive operation of these DG sources, in a grid-connected environment, gives rise to several issues during abnormal conditions of the utility system. This paper addresses the detection method of one such crucial event which is “islanding”. A short length window based Mahalanobis Distance method has been proposed in this paper to detect islanding. A trade-off between computational time and accuracy has been maintained to make it reliable and acceptable. In this method, network parameters such as rate of change of frequency (ROCOF), …
Dynamic Modelling Of Hydroelectric Turbine-Generator Unit Connected To A Hvdc System For Small Signal Stability Analysis, Yin Chin Choo, Ashish Agalgaonkar, Kashem Muttaqi, Sarath Perera, Michael Negnevitsky
Dynamic Modelling Of Hydroelectric Turbine-Generator Unit Connected To A Hvdc System For Small Signal Stability Analysis, Yin Chin Choo, Ashish Agalgaonkar, Kashem Muttaqi, Sarath Perera, Michael Negnevitsky
Associate Professor Kashem Muttaqi
This paper presents the linearised small-signal dynamic modelling of hydroelectric turbine-generator (TG) unit with CIGRE first high-voltage direct current (HVDC) benchmark system in the synchronously rotating D-Q reference frame for small-signal stability analysis. The interaction behaviour between the hydroelectric unit and the dynamics and control of HVDC system is investigated utilising eigen-analysis,participation factor analysis and by conducting sensitivity studies. The computation of eigenvalues and eigenvectors for small signal stability analysis provides an invaluable insight onto the power system dynamic behaviour by characterising the damping and frequency of the system oscillatory modes. Theconsequences of different operating conditions, such as active and …
A Novel Control Strategy For Stand-Alone Operation Of A Wind Dominated Raps System, Sarath Perera, Kashem Muttaqi, Nishad Mendis, M.N Uddin,
A Novel Control Strategy For Stand-Alone Operation Of A Wind Dominated Raps System, Sarath Perera, Kashem Muttaqi, Nishad Mendis, M.N Uddin,
Associate Professor Kashem Muttaqi
This paper presents a novel control strategy for a high penetrated wind based hybrid Remote Area Power Supply (RAPS) system. The proposed RAPS system consists of a Permanent Magnet Synchronous Generator (PMSG) based variable speed wind turbine and a battery energy storage system with a dump load for DC bus voltage control and a diesel generator as a back-up supply. An integrated control approach based on active and reactive power balance of the proposed RAPS system has been proposed and developed with a view to regulate the voltage and frequency within an acceptable bandwidth. The proposed integrated control algorithm is …
A Comprehensive Assessment Tool For Solar Pv Impacts On Low Voltage Three Phase Distribution Networks, M J E Alam, K Muttaqi, Danny Sutanto
A Comprehensive Assessment Tool For Solar Pv Impacts On Low Voltage Three Phase Distribution Networks, M J E Alam, K Muttaqi, Danny Sutanto
Associate Professor Kashem Muttaqi
Modern low voltage (LV) distribution networks are experiencing significant solar photovoltaic (PV) integration. Analysis of changing network behavior, resulting from daylong variation of feeder loads and PV outputs are becoming essential to capture the network response throughout the day under high PV penetration. A comprehensive tool has been presented in this paper to investigate the daylong changes in network behavior due to PV integration. The tool is capable of modeling the asymmetry and unbalance related complexities of distribution networks and also the effect of single phase PV on three phase distribution feeders. Analysis of PV impact has been performed using …
Hydrogen Energy Storage For A Permanent Magnet Wind Turbine Generator Based Autonomous Hybrid Power System, Nishad Mendis, Saad Sayeef, Kashem Muttaqi, Sarath Perera
Hydrogen Energy Storage For A Permanent Magnet Wind Turbine Generator Based Autonomous Hybrid Power System, Nishad Mendis, Saad Sayeef, Kashem Muttaqi, Sarath Perera
Associate Professor Kashem Muttaqi
The Performance of a novel hybrid Remote Area Power Supply (RAPS) system consisting of a Permanent Magnet Synchronous Generator (PMSG), fuel cell system, electrolyser and synchronous condenser is investigated in this paper. The fuel cell system is used to provide power during under-generation scenarios whereas the electrolyser absorbs excess power during over-generation conditions. A synchronous condenser is incorporated into the RAPS system to provide better reactive power and inertial support. Individual controllers for each system module have been developed and implemented. A control coordination methodology is established with a view to regulate the active and reactive power balance of the …
Investigating The Operation Of Multiple Voltage Regulators And Dg In A Distribution Feeder, Dothinka Ranamuka, A Agalgaonkar, K Muttaqi
Investigating The Operation Of Multiple Voltage Regulators And Dg In A Distribution Feeder, Dothinka Ranamuka, A Agalgaonkar, K Muttaqi
Associate Professor Kashem Muttaqi
Integration of distributed generation (DG) in a distribution network may introduce adverse effects including control interaction, oscillatory transients and operational conflicts. This paper investigates the operation of multiple voltage regulators such as on-load tap changer (OLTC) and step voltage regulator (SVR), and DG in a medium voltage distribution feeder. Investigations have been carried out using time domain simulation studies conducted using MATLAB-SimPowerSystems. The results are reported for a case study involving radial distribution feeder, derived from New South Wales (NSW) electricity distribution network in Australia.
Optimal Allocation Of Renewable Enegy Resources For Minimising Emissions In The Distribution Network, M. Abdullah, A. Agalgaonkar, K. Muttaqi
Optimal Allocation Of Renewable Enegy Resources For Minimising Emissions In The Distribution Network, M. Abdullah, A. Agalgaonkar, K. Muttaqi
Associate Professor Kashem Muttaqi
Integration of renewable Distributed Generation (DG) into the distribution networks is one of the effective ways to ensure emission reduction with the added benefits of network support and transmission and distribution system expansion deferral. Emission reduction by renewable DGs mostly depends on the generation technology, size and type of DG units and curtailment of fossil fuel based grid energy. This paper proposes a strategy for evaluating the size and type of renewable DG and determining the best mix of different renewable DG technologies by minimising primary and operational emissions without violating network constraints. A methodology based on time sequential optimisation …
Designing A Culturally Specific E-Learning Website, Penelope Mcfarlane
Designing A Culturally Specific E-Learning Website, Penelope Mcfarlane
Dr Penelope McFarlane
Western Universities have delivered subjects via a variety of means for years. Although business has explored the concept of different cultures requiring different interfaces on their web sites; little has been done to explore the impact of culture on e-learning. This paper explores the development of culturally specific e-learning web sites based in Australia but being delivered in Dubai. The theories of Geert Hofstede were used to explore the culture of Dubai. The web construct was based on St Amant’s work on culturally specific web sites. Computer science students were then surveyed to determine their reaction to the culturally specific …
Dual Boundary Integral Formulation For 2-D Crack Problems, Xiaoping Lu, Wei-Liang Wu
Dual Boundary Integral Formulation For 2-D Crack Problems, Xiaoping Lu, Wei-Liang Wu
Xiaoping Lu
An efficient integral equation formulation for two-dimensional crack problems is proposed with the displacement equation being used on the outer boundary and the traction equation being used on one of the crack faces. Discontinuous quarter point elements are used to correctly model the displacement in the vicinity of crack tips. Using this formulation a general crack problem can be solved in a single-region formulation, and only one of the crack faces needs to be discretised. Once the relative displacements of the cracks are solved numerically, physical quantities of interest, such as crack tip stress intensity factors can be easily obtained. …
A New Exact Solution For Pricing European Options In A Two-State Regime-Switching Economy, Song-Ping Zhu, Alexander Badran, Xiaoping Lu
A New Exact Solution For Pricing European Options In A Two-State Regime-Switching Economy, Song-Ping Zhu, Alexander Badran, Xiaoping Lu
Xiaoping Lu
In this study, we derive a new exact solution for pricing European options in a two-state regime-switching economy. Two coupled Black-Scholes partial differential equations (PDEs) under the regime switching are solved using the Fourier Transform method. A key feature of the newly-derived solution is its simplicity in the form of a single integral with a real integrand, which leads to great computational efficiency in comparison with other closed-form solutions previously presented in the literature. Numerical examples are provided to demonstrate some interesting results obtained from our pricing formula.
A Framework For Optimizing Inter-Operating Business Process Portfolio, Tri Kurniawan, Aditya Ghose, Lam-Son Le
A Framework For Optimizing Inter-Operating Business Process Portfolio, Tri Kurniawan, Aditya Ghose, Lam-Son Le
Dr Lam-Son Le
No abstract provided.
Child's Addition In The Stern-Brocot Tree, Bruce Bates, Martin Bunder, Keith Tognetti
Child's Addition In The Stern-Brocot Tree, Bruce Bates, Martin Bunder, Keith Tognetti
Dr Martin Bunder
We use child's addition and cross-differencing to discover significant relationships for diagonals, paths and branches within the Stern-Brocot tree and the Stern-Brocot sequence. This allows us to develop results for continued fraction summation under child's addition.
Case Study On The Pattern Change In Arabidopsis Thaliana Intron Sequence, Ren Zhang, Rachel Caldwell, Yan-Xia Lin, Jinda Kongcharoen, Yiren Yang
Case Study On The Pattern Change In Arabidopsis Thaliana Intron Sequence, Ren Zhang, Rachel Caldwell, Yan-Xia Lin, Jinda Kongcharoen, Yiren Yang
Associate Professor Yan-Xia Lin
A large portion in eukaryotic genomes is introns but their function is not yet fully elucidated. The aims of this study are to employ the generalized Bernoulli modeling approach to estimate the change points based on GC distribution in intron sequences of Arabidopsis thaliana and to investigate whether there is any correlation between gene properties (the gene expression level and the protein function) and these intron pattern changes. The influence of the intron length and the number of GC on the intron sequence pattern changes is demonstrated. Among the random sampled intron sequences, 10.71% have been identified to have pattern …
The Analysis Of Pattern Change In Intron Sequences, Jinda Kongcharoen, Yan-Xia Lin, Rachel Caldwell, Yiren Yang, Ren Zhang
The Analysis Of Pattern Change In Intron Sequences, Jinda Kongcharoen, Yan-Xia Lin, Rachel Caldwell, Yiren Yang, Ren Zhang
Associate Professor Yan-Xia Lin
The Generalized Bernoulli Modeling approach is used to analyze the pattern change in intron sequences of a model plant species Arabidopsis thaliana. The influence of the intron length and the number of GC on the intron sequence pattern changes is examined. Two other gene properties, the gene expression level and the protein function encoded are also assessed. Among the random sampled intron sequences,10.71% of them have been identified to have sequence pattern change. Our study shows that the number of GC and the intron length significantly influence the intron pattern change while the gene expression level and the protein function …
Loss Protection In Pairs Trading Through Minimum Profit Bounds: A Cointegration Approach, Chandra Gulati, Yan-Xia Lin, Michael Mccrae
Loss Protection In Pairs Trading Through Minimum Profit Bounds: A Cointegration Approach, Chandra Gulati, Yan-Xia Lin, Michael Mccrae
Associate Professor Yan-Xia Lin
No abstract provided.
Improving Promoter Prediction For The Nnpp2.2 Algorithm: A Case Study Using Escherichia Coli Dna Sequences, Ren Zhang, Alexandra Burden, Yan-Xia Lin
Improving Promoter Prediction For The Nnpp2.2 Algorithm: A Case Study Using Escherichia Coli Dna Sequences, Ren Zhang, Alexandra Burden, Yan-Xia Lin
Associate Professor Yan-Xia Lin
No abstract provided.
Assessment Of Length Distributions Between Non-Coding And Coding Sequences Amongst Two Model Organisms, Ren Zhang, Rachel Caldwell, Yan-Xia Lin
Assessment Of Length Distributions Between Non-Coding And Coding Sequences Amongst Two Model Organisms, Ren Zhang, Rachel Caldwell, Yan-Xia Lin
Associate Professor Yan-Xia Lin
No abstract provided.