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Articles 571 - 600 of 2936
Full-Text Articles in Social and Behavioral Sciences
Spectral Flow For Nonunital Spectral Triples, A L. Carey, V Gayral, J Phillips, A Rennie, F A. Sukochev
Spectral Flow For Nonunital Spectral Triples, A L. Carey, V Gayral, J Phillips, A Rennie, F A. Sukochev
Faculty of Engineering and Information Sciences - Papers: Part A
We prove two results about nonunital index theory left open in a previous paper. The first is that the spectral triple arising from an action of the reals on a C*-algebra with invariant trace satisfies the hypotheses of the nonunital local index formula. The second result concerns the meaning of spectral flow in the nonunital case. For the special case of paths arising from the odd index pairing for smooth spectral triples in the nonunital setting, we are able to connect with earlier approaches to the analytic definition of spectral flow.
Free Paratopological Groups, Ali Sayed R. Elfard
Free Paratopological Groups, Ali Sayed R. Elfard
Faculty of Engineering and Information Sciences - Papers: Part A
Let FP(X) be the free paratopological group on a topological space X in the sense of Markov. In this paper, we study the group FP(X) on a Pα-space X where α is an infinite cardinal and then we prove that the group FP(X) is an Alexandroff space if X is an Alexandroff space. Moreover, we introduce a neighborhood base at the identity of the group FP(X) when the space X is Alexandroff and then we give some properties of this neighborhood base. As applications of these, we prove that the group FP(X) is T0 if X is T0, we characterize …
Maskdensity14: An R Package For The Density Approximant Of A Univariate Based On Noise Multiplied Data, Yan-Xia Lin, Mark James Fielding
Maskdensity14: An R Package For The Density Approximant Of A Univariate Based On Noise Multiplied Data, Yan-Xia Lin, Mark James Fielding
Faculty of Engineering and Information Sciences - Papers: Part A
Lin (2014) developed a framework of the method of the sample-moment-based density approximant, for estimating the probability density function of microdata based on noise multiplied data. Theoretically, it provides a promising method for data users in generating the synthetic data of the original data without accessing the original data; however, technical issues can cause problems implementing the method. In this paper, we describe a software package called MaskDensity14, written in the R language, that uses a computational approach to solve the technical issues and makes the method of the sample-moment-based density approximant feasible. MaskDensity14 has applications in many areas, such …
Solvability Conditions For Indefinite Linear Quadratic Optimal Stochastic Control Problems And Associated Stochastic Riccati Equations, Kai Du
Faculty of Engineering and Information Sciences - Papers: Part A
A linear quadratic optimal stochastic control problem with random coefficients and indefinite state/control weight costs is usually linked to an indefinite stochastic Riccati equation (SRE), which is a matrix-valued quadratic backward stochastic differential equation along with an algebraic constraint involving the unknown. Either the optimal control problem or the SRE is solvable only if the given data satisfy a certain structure condition that has yet to be precisely defined. In this paper, by introducing a notion of subsolution for the SRE, we derive several novel sufficient conditions for the existence and uniqueness of the solution to the SRE and for …
Oscillating Water Column Wave Energy Conversion Device Response Spectra, Brad Stappenbelt
Oscillating Water Column Wave Energy Conversion Device Response Spectra, Brad Stappenbelt
Faculty of Engineering and Information Sciences - Papers: Part A
The objective of the present work is to serve as a practical addendum to the discrete parameter Oscillating Water Column (OWC) Wave Energy Conversion (WEC) device model proposed by Folley and Whittaker [1] at the 24th International Conference on Offshore Mechanics and Arctic Engineering. In particular, a method for the interpretation of their discrete parameter model is presented, consisting of a translation from the tuning and air compressibility parameter map reported to a response spectrum representation. In this more commonly encountered form the model is more readily physically interpreted for design and analysis application.
A Framework For The Destructuring Of Clays During Compression, M D. Liu, S Horpibulsuk, Y J. Du
A Framework For The Destructuring Of Clays During Compression, M D. Liu, S Horpibulsuk, Y J. Du
Faculty of Engineering and Information Sciences - Papers: Part A
Based on the work by Liu and Carter (1999, 2000), a framework for the compression behaviour of structured clays is proposed, in which two entities of an existing soil are differentiated and described clearly: the original structure of the soil and the destructuring the soil has experienced. A theoretical Compression Destructuring Line (CDL) is proposed to describe the whole destructuring process of soil from its original or un-destructured state. Soils of the same original structure form a unique CDL, irrespective of loading history or structuring/destructuring history. The "theoretical" original structure of a soil is represented by parameters A and c, …
Application Of Optical-Fiber Bragg Grating Sensors In Monitoring The Rail Track Deformations, S.K. Karimullah Hussaini, Buddhima Indraratna, Jayan S. Vinod
Application Of Optical-Fiber Bragg Grating Sensors In Monitoring The Rail Track Deformations, S.K. Karimullah Hussaini, Buddhima Indraratna, Jayan S. Vinod
Faculty of Engineering and Information Sciences - Papers: Part A
The lateral flow of ballast during the passage of trains can reduce the stability of rail tracks. Therefore, it is important to monitor and restrain the movement of ballast accordingly in order to prevent track misalignment. This current study explored the use of optical-Fiber Bragg Grating (FBG) sensors to measure the lateral displacement of unreinforced and geogrid-reinforced ballast. The tests were conducted on fresh latite basalt at a loading frequency of 20 Hz and up to 250 000 load cycles. The test results showed that the FBG sensing system is fully capable of measuring the lateral displacement of ballast under …
Modelling The Shear Behaviour Of Sedimentary Rock Joints Under Constant Normal Stiffness Conditions, S Thirukumaran, B Indraratna, E T. Brown
Modelling The Shear Behaviour Of Sedimentary Rock Joints Under Constant Normal Stiffness Conditions, S Thirukumaran, B Indraratna, E T. Brown
Faculty of Engineering and Information Sciences - Papers: Part A
The typical shear behaviour of rock joints has been studied under a constant normal load (CNL) or zero normal stiffness condition, but recent studies have shown that this boundary condition may not replicate more practical situations, and that constant normal stiffness (CNS) is a more appropriate boundary condition to describe the stress-strain response of field joints. In addition to the effect of boundary conditions, the shear behaviour of a rough joint also depends on its surface properties and the initial stress acting on its interface. Despite this, exactly how these parameters affect the shear behaviour of joints is not fully …
Nepal Earthquake Of April 25, 2015, T G Sitharam, J S. Vinod
Nepal Earthquake Of April 25, 2015, T G Sitharam, J S. Vinod
Faculty of Engineering and Information Sciences - Papers: Part A
A powerful earthquake of magnitude (M) 7.8 occurred on April 25, 2015 at the plate boundary between Indian plate and Eurasian plate. The epicenter of this earthquake is located approximately 80 km northwest of Kathmandu, Nepal. This epicenter location is near to the district Gorkha for which it is also called as Gorkha earthquake. The convergent movement of the Indian plate with the Eurasian plate resulted in the strain accumulation along major faults and hence produced many significant earthquakes along the boundary in past. This earthquake is as severe as its predecessor event, the 1934 Nepal-Bihar earthquake where the fatalities …
Current Msis Students' Views On Program Outcomes, Heikki Topi, Helena Karsten, Susan A. Brown, Joao Alvaro Carvalho, Brian Donnellan, Jun Shen, Bernard C. Y Tan, Mark F. Thouin
Current Msis Students' Views On Program Outcomes, Heikki Topi, Helena Karsten, Susan A. Brown, Joao Alvaro Carvalho, Brian Donnellan, Jun Shen, Bernard C. Y Tan, Mark F. Thouin
Faculty of Engineering and Information Sciences - Papers: Part A
This paper reports the results of a pilot survey sent to current specialized master’s students in Information Systems at several universities around the world. The survey was developed to support the MSIS revision process, but the results will also provide insights on the perceptions of current IS master’s students regarding their current degree program. The results suggest that the respondents valued individual foundational skills and high-level business competences more than technical or lower-level managerial competences. The study utilized competence specifications from the European e-CF 3.0 model, which was useful and performed well as a competence framework.
Master’S Degree Programs In Information Systems: A Global View, Helena Karsten, Heikki Topi, Susan A. Brown, Joao Alvaro Carvalho, Brian Donnellan, Jun Shen, Bernard C. Y Tan, Mark F. Thouin
Master’S Degree Programs In Information Systems: A Global View, Helena Karsten, Heikki Topi, Susan A. Brown, Joao Alvaro Carvalho, Brian Donnellan, Jun Shen, Bernard C. Y Tan, Mark F. Thouin
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we present an analysis of 254 master’s degree programs in Information Systems, offered by 229 universities in 32 countries. The entry requirements usually include a Bachelor’s degree in IS or a related subject. In some countries such as USA any kind of Bachelor’s degree is acceptable. In a few countries significant relevant work experience can replace or supplement the BSc. The duration of the degrees varies between one to two years, with the student workload between 1350-3200 hours. If we take into consideration the differences in entering the program (from none to four years of IS studies), …
A Summary Of The Special Issue “Cybersecurity And Cryptography”, Qiong Huang, Guomin Yang
A Summary Of The Special Issue “Cybersecurity And Cryptography”, Qiong Huang, Guomin Yang
Faculty of Engineering and Information Sciences - Papers: Part A
Nowadays in the cyber world, massive amounts of data are being collected, transmitted, and stored by different organizations and individuals. As an important asset, data must be well protected in storage and during transmission. Data security is a crucial factor to the success of new information technologies and infrastructures, such as Cloud Computing and Big Data. This Special Issue includes seven research articles presenting new findings and technologies in the area of cybersecurity and cryptography.
The Effects Of It Application Orchestration Capability On Performance, Magno Queiroz, Rajeev Sharma, Tim Coltman, Paul Tallon
The Effects Of It Application Orchestration Capability On Performance, Magno Queiroz, Rajeev Sharma, Tim Coltman, Paul Tallon
Faculty of Engineering and Information Sciences - Papers: Part A
This paper investigates the effects on performance of a firm's capability to orchestrate its portfolio of IT applications. It conceives of IT application orchestration as a dynamic capability and develops a model where the effects of this capability on performance are mediated by an important IT-enabled business outcome: Process agility. Results from an international survey of IT executives show that IT application orchestration capability has a direct positive effect on agility, which in turn improves performance. Further, we show that agility fully mediates the effect of IT application orchestration capability on performance. This paper extends prior theory by proposing and …
Using The Wii Remote For Mobile Device Application Testing: A Proof-Of-Concept, Mark Freeman
Using The Wii Remote For Mobile Device Application Testing: A Proof-Of-Concept, Mark Freeman
Faculty of Engineering and Information Sciences - Papers: Part A
There has been a dramatic shift in the interaction methods of mobile devices over the past decade. From devices simply being able to make phone calls to being able to handle complex tasks traditionally performed on personal computers PCs; this change has led to new interaction issues that need to be understood during the application development process, particularly as these devices now commonly incorporate a touch-screen as their primary source of input. Currently, the methods of conducting software user experience testing of these devices employs techniques that were developed for PCs, however mobile devices are used within different contexts of …
Telemetry, Tracking And Command Subsystem For Libyasat-1, Faisel Em M Tubbal, Akram Alkaseh, Asem Elarabi
Telemetry, Tracking And Command Subsystem For Libyasat-1, Faisel Em M Tubbal, Akram Alkaseh, Asem Elarabi
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper we present the design and the analysis of Telemetry, Tracking and Command Subsystem (TT&CS) for Libyan imaging mini-satellite (LibyaSat-1). This subsystem is the brain and the operating system of any satellite or spacecraft as it performs three important functions; tracking mini-satellite position, monitoring mini-satellite health and status and processing received and transmitted data. Moreover, the uplink and downlink budgets for s-band and x-band antennas are presented. We also designed s-band C-shaped patch antenna for command receiver (2.039 GHz). Electromagnetic simulation was performed to this antenna High Frequency Structure Simulator (HFSS). Our results show that the s-band C-shaped …
Sparse Approximate Inference For Spatio-Temporal Point Process Models, Botond Cseke, Andrew Zammit-Mangion, Tom Heskes, Guido Sanguinetti
Sparse Approximate Inference For Spatio-Temporal Point Process Models, Botond Cseke, Andrew Zammit-Mangion, Tom Heskes, Guido Sanguinetti
Faculty of Engineering and Information Sciences - Papers: Part A
Spatio-temporal log-Gaussian Cox process models play a central role in the analysis of spatially distributed systems in several disciplines. Yet, scalable inference remains computationally challenging both due to the high resolution modelling generally required and the analytically intractable likelihood function. Here, we exploit the sparsity structure typical of (spatially) discretised log-Gaussian Cox process models by using approximate message-passing algorithms. The proposed algorithms scale well with the state dimension and the length of the temporal horizon with moderate loss in distributional accuracy. They hence provide a flexible and faster alternative to both non-linear filtering-smoothing type algorithms and to approaches that implement …
Thz Spectroscopic Characterization Of Biochar, Lucia Lepodise, R A. Lewis, Stephen D. Joseph, Joseph Horvat
Thz Spectroscopic Characterization Of Biochar, Lucia Lepodise, R A. Lewis, Stephen D. Joseph, Joseph Horvat
Faculty of Engineering and Information Sciences - Papers: Part A
Fertile dark soils made by humans in the Amazon basin, terra preta, have influenced the manufacture of the biochar based fertilizers. Different types of biochar exist but not all of them are good in improving the quality of the soil. FTIR was used to distinguish between the more and the less fertile biochar.
A New Approach To Reduce The Expected Energy Not Supplied In A Power Plant Located In A Non-Expandable Transmission System, Hadi Lomei, Danny Sutanto, Kashem M. Muttaqi, Mohsen Assili
A New Approach To Reduce The Expected Energy Not Supplied In A Power Plant Located In A Non-Expandable Transmission System, Hadi Lomei, Danny Sutanto, Kashem M. Muttaqi, Mohsen Assili
Faculty of Engineering and Information Sciences - Papers: Part A
The main objective of most of power plants is to inject power as much as possible into the grid from the power plants. However, the transmission system may restrain the output capability of the power plant, especially, if the power plant is located in an area of non-expandable transmission system. In this situation, any disturbance in the nearby transmission system may force the plant to generate lower than its rated value, which disables it from selling the remaining available generated power to the costumers and also increases the cost of energy not supplied. In this paper, an efficient method is …
Evaluating Distributed Generations In Utility Operation And Planning Issues Using A Novel Fusion Pso-Sfla Algorithm, Esmaeil Mahboubi-Moghaddam, Jamshid Aghaei, Kashem M. Muttaqi, Behrouz Zoghdar-Moghadam-Shahrekohne, Mohammad Rasoul Narimani
Evaluating Distributed Generations In Utility Operation And Planning Issues Using A Novel Fusion Pso-Sfla Algorithm, Esmaeil Mahboubi-Moghaddam, Jamshid Aghaei, Kashem M. Muttaqi, Behrouz Zoghdar-Moghadam-Shahrekohne, Mohammad Rasoul Narimani
Faculty of Engineering and Information Sciences - Papers: Part A
Increasing demand of electrical energy has leaded to utilization of more and more Distributed generation (DG) sources in distribution systems. Since the locations and capacities of the DG sources connected to the distribution system profoundly impact on reducing system loss and improving system reliability, so placement and sizing indication of DGs is the most substantial process in distribution systems. By adding the reliability objective to this problem, it becomes more complicated than before and it needs to be solved with an accurate algorithm. To this reason, to solve the proposed problem a new approach based on the mixture of two …
Characteristics Of Power Quality Disturbances In Australia: Voltage Dips At Low-Voltage Sites, Sean T. Elphick, Victor W. Smith, Victor J. Gosbell, Sarath Perera, Philip Ciufo, Gerrard M. Drury
Characteristics Of Power Quality Disturbances In Australia: Voltage Dips At Low-Voltage Sites, Sean T. Elphick, Victor W. Smith, Victor J. Gosbell, Sarath Perera, Philip Ciufo, Gerrard M. Drury
Faculty of Engineering and Information Sciences - Papers: Part A
Voltage dips are considered to be one of the costliest of all power quality disturbances due to their disruption of industrial and commercial operations. The ability to characterise the voltage dip performance of distribution networks has many benefits for industry. There is considerable potential for industry to make large economic gains if voltage dip behaviour can be better understood and planned for. To put strategies in place to deal with voltage dips, there is a need for extensive data collection and analysis so that correct planning decisions can be made. This study details the characteristics of voltage dip data which …
Optimization Of The Number Of Rays In Interpolation For Light Field Based Free Viewpoint Systems, Hooman Shidanshidi, Farzad Safaei, Wanqing Li
Optimization Of The Number Of Rays In Interpolation For Light Field Based Free Viewpoint Systems, Hooman Shidanshidi, Farzad Safaei, Wanqing Li
Faculty of Engineering and Information Sciences - Papers: Part A
Light field (LF) rendering is widely used in free viewpoint video systems (FVV). Different methods have been proposed to employ depth maps to improve the rendering quality. However, estimation of depth is often error-prone. In this paper, a new method based on the concept of effective sampling density (ESD) is proposed for evaluating the depth-based LF rendering algorithms at different levels of errors in the depth estimation. In addition, for a given rendering quality, we provide an estimation of number of rays required in the interpolation algorithm to compensate for the adverse effect caused by errors in depth maps. The …
Multi-View Indoor Scene Reconstruction From Compressed Through-Wall Radar Measurements Using A Joint Bayesian Sparse Representation, Van Ha Tang, Abdesselam Bouzerdoum, Son Lam Phung, Fok Hing Chi Tivive
Multi-View Indoor Scene Reconstruction From Compressed Through-Wall Radar Measurements Using A Joint Bayesian Sparse Representation, Van Ha Tang, Abdesselam Bouzerdoum, Son Lam Phung, Fok Hing Chi Tivive
Faculty of Engineering and Information Sciences - Papers: Part A
This paper addresses the problem of scene reconstruction, incorporating wall-clutter mitigation, for compressed multi-view through-the-wall radar imaging. We consider the problem where the scene is sensed using different reduced sets of frequencies at different antennas. A joint Bayesian sparse recovery framework is first employed to estimate the antenna signal coefficients simultaneously, by exploiting the sparsity and correlations between antenna signals. Following joint signal coefficient estimation, a subspace projection technique is applied to segregate the target coefficients from the wall contributions. Furthermore, a multitask linear model is developed to relate the target coefficients to the scene, and a composite scene image …
Investigation Of Ultrasmall 1 X N Awg For Soi-Based Awg Demodulation Integration Microsystem, Hongqiang Li, Wentao Gao, Enbang Li, Chunxiao Tang
Investigation Of Ultrasmall 1 X N Awg For Soi-Based Awg Demodulation Integration Microsystem, Hongqiang Li, Wentao Gao, Enbang Li, Chunxiao Tang
Faculty of Engineering and Information Sciences - Papers: Part A
Optoelectronic integration technologies based on silicon-on-insulator (SOI) can bring revolutionary change to on-chip arrayed waveguide grating (AWG) demodulation systems. In this study, we present several ultrasmall 1 x N AWGs for an SOI-based AWG demodulation integration microsystem of different scales. The core sizes of the fabricated AWGs are smaller than 400 x 600 μm2. Experimental results match the simulation results, indicating that AWGs have a good transmission spectrum of low crosstalk below -20 dB and low insertion loss below -6.5 dB. The fabricated AWGs can be perfectly applied to improve the integration level and performance of the SOI-based AWG demodulation …
Single Molecular Shuttle-Junction: Shot Noise And Decoherence, Wenxi Lai, C Zhang, Zhongshui Ma
Single Molecular Shuttle-Junction: Shot Noise And Decoherence, Wenxi Lai, C Zhang, Zhongshui Ma
Faculty of Engineering and Information Sciences - Papers: Part A
Single molecular shuttle-junction is one kind of nanoscale electromechanical tunneling system. In this junction, a molecular island oscillates depending on its charge occupation, and this charge dependent oscillation leads to modulation of electron tunneling through the molecular island. This paper reviews recent development on the study of current, shot noise and decoherence of electrons in the single molecular shuttle-junction. We will give detail discussions on this topic using the typical system model, the theory of fully quantum master equation and the Aharonov-Bohm interferometer.
Simple Method For Measuring The Linewidth Enhancement Factor Of Semiconductor Lasers, Yuanlong Fan, Yanguang Yu, Jiangtao Xi, Ginu Rajan, Qinghua Guo, Jun Tong
Simple Method For Measuring The Linewidth Enhancement Factor Of Semiconductor Lasers, Yuanlong Fan, Yanguang Yu, Jiangtao Xi, Ginu Rajan, Qinghua Guo, Jun Tong
Faculty of Engineering and Information Sciences - Papers: Part A
A simple method for measuring the linewidth enhancement factor (LEF) of semiconductor lasers (SLs) is proposed and demonstrated in this paper. This method is based on the self-mixing effect when a small portion of optical signal intensity emitted by the SL reflected by the moving target re-enters the SL cavity, leading to a modulation in the SL's output power intensity, in which the modulated envelope shape depends on the optical feedback strength as well as the LEF. By investigating the relationship between the light phase and power from the well-known Lang and Kobayashi equations, it was found that the LEF …
Factor Analytic Mixed Models For The Provision Of Grower Information From National Crop Variety Testing Programs, Alison B. Smith, Aanandini Ganesalingam, Haydn Kuchel, Brian R. Cullis
Factor Analytic Mixed Models For The Provision Of Grower Information From National Crop Variety Testing Programs, Alison B. Smith, Aanandini Ganesalingam, Haydn Kuchel, Brian R. Cullis
Faculty of Engineering and Information Sciences - Papers: Part A
Crop variety testing programs are conducted in many countries world-wide. Within each program, data are combined across locations and seasons, and analysed in order to provide information to assist growers in choosing the best varieties for their conditions. Despite major advances in the statistical analysis of multi-environment trial data, such methodology has not been adopted within national variety testing programs. The most commonly used approach involves a variance component model that includes variety and environment main effects, and variety by environment ( VxE ) interaction effects. The variety predictions obtained from such an analysis, and subsequently reported to growers, are …
Zero Carbon Homes: Perceptions From The Uk Construction Industry, Emma Elizabeth Heffernan, Wei Pan, Xi Liang, Pieter De Wilde
Zero Carbon Homes: Perceptions From The Uk Construction Industry, Emma Elizabeth Heffernan, Wei Pan, Xi Liang, Pieter De Wilde
Faculty of Engineering and Information Sciences - Papers: Part A
The take-up of the many voluntary energy efficiency standards which exist in the UK and internationally has been limited. As a result, governments have recognised the need to introduce mandatory schemes through legislation, e.g. from 2016 all new build homes in the UK will be required to achieve zero carbon in regulated energy consumption. However, as 2016 approaches, very few zero carbon homes are being delivered. This paper explores the drivers and barriers for zero carbon homebuilding. The perceptions of the wider construction industry were gathered through a series of semi-structured interviews with professionals involved in commissioning, designing, constructing and …
Towards Knowledge Sharing In Disaster Management: An Agent Oriented Knowledge Analysis Framework, Dedi Iskandar Inan, Ghassan Beydoun, Simon Opper
Towards Knowledge Sharing In Disaster Management: An Agent Oriented Knowledge Analysis Framework, Dedi Iskandar Inan, Ghassan Beydoun, Simon Opper
Faculty of Engineering and Information Sciences - Papers: Part A
Disaster Management (DM) is a complex set of interrelated activities. The activities are often knowledge intensive and time sensitive. Sharing the required knowledge timely is critical for DM. In developed countries, for recurring disasters (e.g. floods), there are dedicated document repositories of Disaster Management Plans (DMP) that can be accessed as needs arise. However, accessing the appropriate plan in a timely manner and sharing activities between plans often requires domain knowledge and intimate knowledge of the plans in the first place. In this paper, we introduce an agent-based knowledge analysis method to convert DMPs into a collection of knowledge units …
Loss Of Derivatives In The Infinite Type, Tran Vu Khanh, Stefano Pinton, Giuseppe Zampieri
Loss Of Derivatives In The Infinite Type, Tran Vu Khanh, Stefano Pinton, Giuseppe Zampieri
Faculty of Engineering and Information Sciences - Papers: Part A
We prove hypoellipticity with loss of ϵϵ derivatives for a system of complex vector fields whose Lie-span has a superlogarithmic estimate. In CxRCxR, the model is (L¯¯¯¯,f¯¯¯kL)(L¯,f¯kL) where f¯¯¯=z¯¯¯hf¯=z¯h for h≠0h≠0 and LL is the vector field tangential to the exponentially non-degenerate hypersurface of infinite type defined by x2=e−1∣z∣αx2=e−1∣z∣α for α<1
Attenuation And Propagation Of Voltage Unbalance In Radial Distribution Networks, Devinda Perera, Philip Ciufo, Lasantha G. Meegahapola, Sarath Perera
Attenuation And Propagation Of Voltage Unbalance In Radial Distribution Networks, Devinda Perera, Philip Ciufo, Lasantha G. Meegahapola, Sarath Perera
Faculty of Engineering and Information Sciences - Papers: Part A
Recently published International Electrotechnical Committee (IEC) technical reports IEC 61000-3-13 provides detailed methodologies for managing voltage unbalance (VU) in electric power systems. A key aspect in the VU emission allocation process is the estimation of VU propagation in different parts of the network. Although the VU propagation from upstream networks to downstream networks is adequately addressed, the attenuation of VU when propagating from downstream to upstream networks at the same voltage level has not been properly taken into account in the aforementioned methodologies. Furthermore, mains connected three-phase induction motors are known to attenuate VU, and there is no methodology currently …