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Articles 2251 - 2280 of 2936
Full-Text Articles in Social and Behavioral Sciences
Long-Distance Walking Effect On Below-Knee Amputee Compensatory Gait Patterns And Implications On Prosthetic Designs And Training, L F. Yeung, Aaron Leung, Ming Zhang, Winson Lee
Long-Distance Walking Effect On Below-Knee Amputee Compensatory Gait Patterns And Implications On Prosthetic Designs And Training, L F. Yeung, Aaron Leung, Ming Zhang, Winson Lee
Faculty of Engineering and Information Sciences - Papers: Part A
Trans-tibial amputees are advised to walk as much as able people to achieve healthy and independent life. However, they usually have difficulties in doing so. Previous researches only included data from a few steps when studying the gait of amputees. Walking over a long distance was rarely examined. The objective of this study was to investigate the changes in spatial-temporal, kinetic and kinematic gait parameters of trans-tibial amputees after long-distance walking. Six male unilateral trans-tibial amputees performed two sessions of 30-min walking on a level treadmill at their self-selected comfortable speed. Gait analysis was undertaken over-ground: (1) before walking, (2) …
A Real-Time In Vivo Dosimetric Verification Method For High-Dose Rate Intracavitary Brachytherapy Of Nasopharyngeal Carcinoma, Zhen-Yu Qi, Xiao-Wu Deng, X Cao, Shao-Min Huang, Michael L. Lerch, Anatoly B. Rosenfeld
A Real-Time In Vivo Dosimetric Verification Method For High-Dose Rate Intracavitary Brachytherapy Of Nasopharyngeal Carcinoma, Zhen-Yu Qi, Xiao-Wu Deng, X Cao, Shao-Min Huang, Michael L. Lerch, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
Purpose: A real-time in vivo dosimetric verification method using metal-oxide-semiconductor field effect transistor (MOSFET) dosimeters has been developed for patient dosimetry in high-dose rate (HDR) intracavitary brachytherapy of nasopharyngeal carcinoma (NPC). Methods: The necessary calibration and correction factors for MOSFET measurements in 192Iridium source were determined in a water phantom. With the detector placed inside a custom-made nasopharyngeal applicator, the actual dose delivered to the tumor was measured in vivo and compared to the calculated values using a commercial brachytherapy planning system. Results: Five MOSFETs were independently calibrated with the HDR source, yielding calibration factors of 0.48 ± 0.007 cGymV. …
Analysis Of Thermal Stress During Of Twin-Roll Casting Of Magnesium Alloy, Yucheng Zhang, T Han, Zhengyi Jiang, Dongbin Wei
Analysis Of Thermal Stress During Of Twin-Roll Casting Of Magnesium Alloy, Yucheng Zhang, T Han, Zhengyi Jiang, Dongbin Wei
Faculty of Engineering and Information Sciences - Papers: Part A
The process of twin-roll casting including pouring, solidifying, rolling and cooling can be accomplished in a very short time. Consequently, some important process parameters in the twin-roll casting that are difficult to be obtained in experiment can be acquired using numerical simulation. In this paper, a numerical simulation based on a 2D finite element model of vertical twin-roll strip casting of magnesium alloy has been conducted, and the thermal stress fields are significantly discussed. The influences of key process parameters consisting of submerged nozzle depth and nozzle spray angle have been studied. The thermal cracks on the surface of the …
Biocompatible Ferroelectric (Na,K)Nbo3 Nanofibers, A Jalalian, A M. Grishin
Biocompatible Ferroelectric (Na,K)Nbo3 Nanofibers, A Jalalian, A M. Grishin
Faculty of Engineering and Information Sciences - Papers: Part A
"Dense homogeneous textile composed from continuous bead-free sodium potassium niobate (NKN) nanofibers 100 mu m long and 50-200 nm in diameter was sintered by sol-gel calcination assisted electrospinning. High resolution electron microscopy and x-ray diffraction revealed preferential cube-on-cube growth of fibers in [001] direction. Raman spectrum of NKN fibers contains all the features characteristic to electrically poled orthorhombic phase. In contrast to polycrystalline ceramics, it shows relative enhancement of the Raman cross section of isotropic A(1g)(nu(1)) mode compared with polar axis defined F(2g)(nu(5)) and E(g)(nu(2)) vibrations. We interpret this as an evidence for superparaelectric state of NKN nanofibers. Spontaneous polarization …
Towards Formalizing A Reputation System For Cheating Detection In Peer-To-Peer-Based Massively Multiplayer Online Games, Willy Susilo, Yang-Wai Chow, Rungrat Wiangsripanawan
Towards Formalizing A Reputation System For Cheating Detection In Peer-To-Peer-Based Massively Multiplayer Online Games, Willy Susilo, Yang-Wai Chow, Rungrat Wiangsripanawan
Faculty of Engineering and Information Sciences - Papers: Part A
The rapidly growing popularity of Massively Multiplayer Online Games (MMOGs) has given rise to an increase in the number of players world wide. MMOGs enable many players interact together through a shared sense of presence created by the game. The Peer-to-Peer (P2P) network topology overcomes communication bottleneck problems associated with centralized client/server sys- tems. Thus, P2P-based MMOGs are seen as the way of the future, and many dierent P2P-based MMOG architectures have been proposed to date. However, many architectures are proposed in an ad hoc manner and enhancing the security of such systems is an elusive research problem. In this …
Recent Progress On Programming Methods For Industrial Robots, Zengxi Pan, Joseph Polden, Nathan Larkin, Stephen Van Duin, John Norrish
Recent Progress On Programming Methods For Industrial Robots, Zengxi Pan, Joseph Polden, Nathan Larkin, Stephen Van Duin, John Norrish
Faculty of Engineering and Information Sciences - Papers: Part A
"Although an automated flexible production cell is an intriguing prospect for small to median enterprises (SMEs) in current global market conditions, the complexity of programming remains one of the major hurdles preventing automation using industrial robots for SMEs. This paper provides a comprehensive review of the recent research progresses on the programming methods for industrial robots, including online programming, offline programming (OLP), and programming using Augmented Reality (AR). With the development of more powerful 3D CAD/PLM software, computer vision, sensor technology, etc. new programming methods suitable for SMEs are expected to grow in years to come. (C) 2011 Elsevier Ltd. …
Mechanics Of Design And Model Development Of Cvc-Plus Roll Curve, Jianzhong Xu, Dianyao Gong, Zhengyi Jiang, Xianghua Liu, Guodong Wang
Mechanics Of Design And Model Development Of Cvc-Plus Roll Curve, Jianzhong Xu, Dianyao Gong, Zhengyi Jiang, Xianghua Liu, Guodong Wang
Faculty of Engineering and Information Sciences - Papers: Part A
The mathematic model of CVC-Plus work roll curve is built. The ratio of the initial shifting value to the target crown is determined, and the mathematical model considering the relationship between the coefficients A2, A3, A4, A5 and is established. According to the theoretical analysis, the distance between the maximum or minimum point of the high order equivalent crown for work roll with CVC-plus roll curve and the rolling central point is the times of the roll barrel length. In general, the initial shifting value of the CVC-plus roll curve is not equal to the initial shifting value of the …
Multifactor Optimization Of A Fuzzy-Pid Controller Using Genetic Algorithm, Xiaofeng He, Wei Chen, Bihai Zhu, Zhengyi Jiang, Christopher David Cook
Multifactor Optimization Of A Fuzzy-Pid Controller Using Genetic Algorithm, Xiaofeng He, Wei Chen, Bihai Zhu, Zhengyi Jiang, Christopher David Cook
Faculty of Engineering and Information Sciences - Papers: Part A
The design of a Fuzzy-PID controller involves setting the fuzzy rules, membership functions and its associated scaling factors. How to obtain a better control result and how these scaling factors affect the controller's performance are still a challenge. In this paper, the automatic position control system of a Hille 100 experimental rolling mill was used as a research testbed. Based on the mathematical control model of the rolling mill, a Fuzzy-PID controller was developed, and the process of implementing global optimization considering all these factors simultaneously by using genetic algorithm is introduced in detail. Through simulation, the performance of the …
Study On Surface Roughness And Friction During Hot Rolling Of Stainless Steel 301, Dongbin Wei, Zhengyi Jiang, Junxia Huang, Aiwen Zhang, Xu Shi, Sihai Jiao
Study On Surface Roughness And Friction During Hot Rolling Of Stainless Steel 301, Dongbin Wei, Zhengyi Jiang, Junxia Huang, Aiwen Zhang, Xu Shi, Sihai Jiao
Faculty of Engineering and Information Sciences - Papers: Part A
A well-defined boundary condition is important for generating an accurate model for simulating metal forming process. It is important to characterize the features of the oxide scale in hot rolling of stainless steel strip. Short time oxidation tests in humid air with water vapor content of 7.0 vol. % were carried out using Gleeble 3500 thermo-mechanical simulator. The deformation, surface morphology of oxide scale, and the friction in hot rolling were studied by conducting hot rolling tests. The results show that the surface roughness decreases with an increase of reduction. The effect of oxide scale on friction and surface roughness …
Nonlinear Analysis Of Biaxially Loaded High Strength Rectangular Concrete-Filled Steel Tubular Slender Beam-Columns, Part I: Theory, Qing Quan Liang, Vipulkumar Ishvarbhai Patel, Muhammad N. S Hadi
Nonlinear Analysis Of Biaxially Loaded High Strength Rectangular Concrete-Filled Steel Tubular Slender Beam-Columns, Part I: Theory, Qing Quan Liang, Vipulkumar Ishvarbhai Patel, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a new numerical model for the nonlinear inelastic analysis of biaxially loaded high strength thin-walled rectangular concrete-filled steel tubular (CFST) slender beam-columns. The numerical model considers the effects of progressive local buckling, initial geometric imperfections, high strength materials and second order. The accurate fiber element method is used to model the inelastic behavior of composite cross-sections. Theoretical models are developed that simulate the load-deflection responses and strength envelopes of thin-walled rectangular CFST slender beamcolumns under biaxial loads. New computational algorithms based on the M ller's method are developed to adjust the depth and orientation of the neutral …
The Benefits Of Introducing Electronic Health Records In Residential Aged Care Facilities: A Multiple Case Study, Yiting Zhang, Ping Yu, Jun Shen
The Benefits Of Introducing Electronic Health Records In Residential Aged Care Facilities: A Multiple Case Study, Yiting Zhang, Ping Yu, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part A
Purpose: Information and communications technology solutions have been introduced into the residential aged care system in order to improve the effectiveness and efficiency of aged care, however to date, the actual benefits have not been systematically analysed. The aim of this study was to identify the benefits of electronic health records (EHR) in residential aged care services and to examine how the benefits have been achieved. Method: A qualitative interview study was conducted in nine residential aged care facilities (RACFs) belonging to three organisations in the Australian Capital Territory (ACT), New South Wales (NSW) and Queensland, Australia. A longitudinal investigation …
Recrystallisation Behaviour Of Low Carbon Steel With And Without Addition Of Chromium, Azdiar A. Gazder, Vladimir Bata, Sujoy S. Hazra, Elena V. Pereloma
Recrystallisation Behaviour Of Low Carbon Steel With And Without Addition Of Chromium, Azdiar A. Gazder, Vladimir Bata, Sujoy S. Hazra, Elena V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
The effects of 0.74wt% Cr addition on the recrystallisation kinetics of low carbon (LC) steel was investigated using Vickers hardness testing, optical metallography and Electron Back- Scattering Diffraction (EBSD). Compared to the unalloyed steel, Cr addition significantly delays the time for recrystallisation and increases the JMAK pre-exponential factor (k) by an order of magnitude. During initial softening, EBSD returned similar orientations for nucleated and growing grain fractions in both steels. However with longer annealing times the micro-texture of recrystallised grains differs from their earlier counterparts. Overall, the effect of fine Cr carbides on grain boundary mobility in the LC-Cr steel …
Strain-Induced Phase Transformation During Thermo-Mechanical Processing Of Titanium Alloys, A Dehghan-Manshadi, Rian J. Dippenaar
Strain-Induced Phase Transformation During Thermo-Mechanical Processing Of Titanium Alloys, A Dehghan-Manshadi, Rian J. Dippenaar
Faculty of Engineering and Information Sciences - Papers: Part A
Strain-induced phase transformation studies have been conducted in a Ti-6Al-2Sn-4Zr-6Mo alloy. This alloy was subjected to b sub-transus deformation upon slow cooling from the b-phase field and the effect of strain on the extent and morphology of the phase transformation during hot-deformation was determined. In addition, the transformation kinetics and the morphology of the newly formed a-phase were studied following deformation under different cooling conditions. By applying strain, the rate of the b-to-a phase transformation increased significantly during deformation as well as during slow cooling following deformation. This increase in the kinetics of the b-to-a transformation can be ascribed to …
Comparison Of Some Tests Of Fit For The Inverse Gaussian Distribution, D J. Best, John C. W Rayner, Olivier Thas
Comparison Of Some Tests Of Fit For The Inverse Gaussian Distribution, D J. Best, John C. W Rayner, Olivier Thas
Faculty of Engineering and Information Sciences - Papers: Part A
This paper gives an empirical investigation of some tests of goodness of fit for the inverse Gaussian distribution.
Synthesis And Electrochemical Properties Of Sn-Sno2/C Nanocomposite, Chuanqi Feng, Meiyu Dan, Chaofeng Zhang, Zaiping Guo, Shiquan Wang, R Zeng
Synthesis And Electrochemical Properties Of Sn-Sno2/C Nanocomposite, Chuanqi Feng, Meiyu Dan, Chaofeng Zhang, Zaiping Guo, Shiquan Wang, R Zeng
Faculty of Engineering and Information Sciences - Papers: Part A
A Sn-Sn02/C nanocomposite was synthesized using the electrospinning method. Thermal analysis was used to determine the content range of Sn and Sn02 in the composite. The composite was characterized by X-ray diffraction, and the particle size and shape in the Sn-SnOiC composite were determined by scanning and transmission electron microscopy. The results show that the Sn-Sn02/C composite takes on a nanofiber morphology, with the diameters of the nanofibers distributed from 50 to 200 nm. The electrOChemical properties of the Sn-SnOiC composite were also investigated. The Sn-SnOiC composite as an electrode material has both higher reversible capacity (887 mAh· g-I). and …
Multi-Level Controlled Signature, Pairat Thorncharoensri, Willy Susilo, Yi Mu
Multi-Level Controlled Signature, Pairat Thorncharoensri, Willy Susilo, Yi Mu
Faculty of Engineering and Information Sciences - Papers: Part A
In this work, we present and establish a new primitive called Multi-level Controlled Signature. This primitive allows a signer to specify a security level to limit the verifiability of the signature. This primitive works as follows. Without losing generality, we assume the security levels of a group of users are defined in ascending order, where “A” represents the lowest security level and “Z” represents the highest security level, respectively. When a signer signs a message by specifying a security level “C”, all users who have a security level greater than “C” will be able to verify while other users whose …
Perm: Practical Reputation-Based Blacklisting Without Ttps, Man Ho Allen Au, Apu Kapadia
Perm: Practical Reputation-Based Blacklisting Without Ttps, Man Ho Allen Au, Apu Kapadia
Faculty of Engineering and Information Sciences - Papers: Part A
Some users may misbehave under the cover of anonymity by, e.g., defacing webpages on Wikipedia or posting vulgar comments on YouTube. To prevent such abuse, a few anonymous credential schemes have been proposed that revoke access for misbehaving users while maintaining their anonymity such that no trusted third party (TTP) is involved in the revocation process. Recently we proposed BLACR, a TTP-free scheme that supports ‘reputation-based blacklisting’ — the service provider can score users’ anonymous sessions (e.g., good vs. inappropriate comments) and users with insufficient reputation are denied access. The major drawback of BLACR is the linear computational overhead in …
Voltage Unbalance Management In Power Systems Based On Iec 61000-3-13:2008: Implications On The Use Of 'Kue Factor', Upuli Jayatunga, Sarath Perera, Philip Ciufo
Voltage Unbalance Management In Power Systems Based On Iec 61000-3-13:2008: Implications On The Use Of 'Kue Factor', Upuli Jayatunga, Sarath Perera, Philip Ciufo
Faculty of Engineering and Information Sciences - Papers: Part A
Voltage unbalance emission allocation principles prescribed in IEC61000-3-13:2008 Technical Report utilise a factor, kuE, which allows separation of the total voltage unbalance that arises at a point of evaluation due to both the load under consideration and the supply network. As per the definition given, this factor (kuE) accounts for the unbalance emission that arises due to the load whereas (1-kuE) accounts for unbalance that arises due to the network. The technical report prescribes a range of values from which a suitable value can be chosen based on the system characteristics, however, no systematic methodologies exist to-date to determine the …
Simulation Model Of A Grid-Connected Single-Phase Photovoltaic System In Pscad/Emtdc, Brian K. Perera, Sridhar R. Pulikanti, Philip Ciufo, Sarath Perera
Simulation Model Of A Grid-Connected Single-Phase Photovoltaic System In Pscad/Emtdc, Brian K. Perera, Sridhar R. Pulikanti, Philip Ciufo, Sarath Perera
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, a complete simulation model of a grid-connected single-phase two-stage photovoltaic (PV) system with associated controllers is presented. The simulation model is developed in PSCAD/EMTDC simulation program. The component models of the grid-connected PV system include a PV array, a dc-dc boost converter, a voltage source converter (VSC) and an LCL filter. Components of the LCL filter, the dc-link capacitor of the VSC and the inductor of the dc-dc boost converter are established theoretically and that are used in modelling the grid-connected PV system. The control architecture of the presented system incorporates a synchronous reference frame phase-locked-loop (s-PLL), …
The Effect Of Incomplete Mixing Upon The Belousov-Zhabotinskii Reaction, Ahmed Hussein Msmali, Mark I. Nelson, Maureen P. Edwards
The Effect Of Incomplete Mixing Upon The Belousov-Zhabotinskii Reaction, Ahmed Hussein Msmali, Mark I. Nelson, Maureen P. Edwards
Faculty of Engineering and Information Sciences - Papers: Part A
The aim of this research to investigate the effect of incomplete mixing upon the existence of periodic solutions. To this end we study the behaviour of the Belousov- Zhabotinskii (B-Z) reaction in a batch reactor. The B-Z reaction is a well studied chemical system that exhibits periodic behaviour. Furthermore, simplified mathematical models exist which have been validated both against experimental data and larger chemical mechanisms. Specifically, we study the `Oregonator' model for the B-Z reaction due to Field and Noyes (1974). This consists of five chemical reactions involving three independent chemical intermediates. We extend this model by combining it with …
Underground Coal Mine Delay Data Analysis System, Ernest Y. Baafi, Ian Porter
Underground Coal Mine Delay Data Analysis System, Ernest Y. Baafi, Ian Porter
Faculty of Engineering and Information Sciences - Papers: Part A
Due to the high levels of uncertainty in underground coal mining operations, delays occur regularly which inadvertently reduce the utilisation of mining equipment. In most coal mines delay data is primarily sourced from shift reports, machine monitoring and production systems. The recording process is initiated commonly at the end of a shift to ensure the correct information is recorded for the managerial decision process. An issue that the Australian coal industry faces is the lack of a standardised delay recording process and delay classification system. Tools used within the industry to analyse delay data are mostly mine specific and offer …
Modelling A Longwall Production System Using Flexsim 3d Simulation Software, D Cai, E Baafi, I Porter
Modelling A Longwall Production System Using Flexsim 3d Simulation Software, D Cai, E Baafi, I Porter
Faculty of Engineering and Information Sciences - Papers: Part A
Longwall mining accounts for more than 75% of underground coal production in Australia. It is a popular underground coal mining method worldwide, mainly due to its high extraction ratio, high productivity and increased safety due to improved powered support units. A longwall system requires significant capital investment, and it is necessary to minimise the financial risk associated with this investment. Minimisation of this financial risk requires a sound knowledge of the relationship between underlying operational/technical constraints and associated costs. A discrete simulation model using the Flexsim 3D virtual reality environment has been developed to assist management evaluate the impact of …
Thermodynamic Analysis Of A High-Yield Biochemical Process For Biofuel Production, M Imroz Sohel, Michael W. Jack
Thermodynamic Analysis Of A High-Yield Biochemical Process For Biofuel Production, M Imroz Sohel, Michael W. Jack
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a thermodynamic analysis of a high-yield biochemical process for biofuel production from lignocelluosic biomass based on a previously proposed process. Unlike the standard biochemical process, which ferments sugar intermediates to ethanol, the process under consideration converts sugars to acetic acid which is esterified and hydrogenated to produce ethanol. This process has a significantly higher yield and produces no carbon dioxide. However, we find that the thermodynamic efficiency of the process is not increased in proportion to the yield gain. An additional survey of various biofuel production processes showed no direct correlation between yield and thermodynamic efficiency. This …
Measuring Face Familiarity And Its Application To Face Recognition, Ce Zhan, Wanqing Li, Philip O. Ogunbona
Measuring Face Familiarity And Its Application To Face Recognition, Ce Zhan, Wanqing Li, Philip O. Ogunbona
Faculty of Engineering and Information Sciences - Papers: Part A
The familiarity of faces is one of the key factors that come into play during human face analysis. However, there is very little research that studies face familiarity. In this paper, two methods are proposed to quantitatively measure the degree of familiarity of a face with respect to a known set. The methods are in accordance with the psychological study. In particular, non-negative matrix factorization (NMF) is extended to learn a localized non-overlapping subspace representation of commonly experienced facial patterns from known faces. The familiarity of a given face is then measured based on its reconstruction error after being projected …
Beyond Simple Classifications: Contemporary Information Systems Development Projects As Complex Adaptive Systems, Karlheinz Kautz
Beyond Simple Classifications: Contemporary Information Systems Development Projects As Complex Adaptive Systems, Karlheinz Kautz
Faculty of Engineering and Information Sciences - Papers: Part A
Contemporary Information Systems Development (ISD) takes place in a dynamic environment and is generally acknowledged as a complex activity. We investigate whether complex adaptive systems (CAS) theory is relevant as a theoretical foundation for understanding ISD, and if so, what kind of conception can be achieved by utilizing the theory? We introduce key CAS concepts and describe an emergent method framework for understanding ISD. Extending existing research, our main contribution is twofold: We first show how CAS and CAS principles are advantageous for comprehending and organizing ISD in general, beyond any particular development approach chosen for the execution of a …
An Ontology Development Methodology To Integrate Existing Ontologies In An Ontology Development Process, Nelson K. Y Leung, Sim Kim Lau, Nicole Tsang
An Ontology Development Methodology To Integrate Existing Ontologies In An Ontology Development Process, Nelson K. Y Leung, Sim Kim Lau, Nicole Tsang
Faculty of Engineering and Information Sciences - Papers: Part A
Ontology is defmed as an explicit specification of a conceptualization while a conceptualization is an abstract, simplified view of the world that we wish to represent for some purpose. To build high quality ontologies, developers are required to choose and follow a suitable ontology development methodology in which containing a series of steps, activities and guidelines that are put together in an organized and systematic manner. Literatures show that building ontologies by reusing existing ontologies is more cost effective than building from scratch. However, majority of the methodologies only provide a very limited discussion about how to perform integration or …
Power-Aware Routing In Networks With Delay And Link Utilization Constraints, Gongqi Lin, Sieteng Soh, Mihai Lazarescu, Kwan-Wu Chin
Power-Aware Routing In Networks With Delay And Link Utilization Constraints, Gongqi Lin, Sieteng Soh, Mihai Lazarescu, Kwan-Wu Chin
Faculty of Engineering and Information Sciences - Papers: Part A
Current network infrastructures are over-provisioned and thus exhibit poor power efficiency at low traffic load. In this paper, we consider networks comprising of bundled links, whereby each link has one or more physical cables that can be switched off independently. The problem at hand is then to switch off redundant cables during off peak periods, while retaining the QoS provided to existing traffic demands. Unfortunately, the problem to maximally shutdown redundant cables is an NP-complete problem. Henceforth, we design a fast heuristic, called Multiple Paths by Shortest Path First (MSPF), that aims to maximize the number of switched-off cables subject …
Segmentations Of Through-The-Wall Radar Images, C H. Seng, M G. Amin, F Ahmad, A Bouzerdoum
Segmentations Of Through-The-Wall Radar Images, C H. Seng, M G. Amin, F Ahmad, A Bouzerdoum
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we examine the use of image segmentation approaches for target detection in TWRI. The betweenclass variance thresholding, entropy-based segmentation, and Kmeans clustering are applied to segment target and clutter regions. Real 2D polarimetric images are used to demonstrate that simple histogram-based segmentation methods produce either comparable or improved performance over the Likelihood Ratio Tests (LRT) detector. Specifically, the results show that, for the cases considered, the entropy-based segmentation outperforms the other image segmentation methods and the LRT detector.
Improvements In Dose Calculation Accuracy For Small Off-Axis Targets In High Dose Per Fraction Tomotherapy, Nicholas Hardcastle, Adam Bayliss, Jeannie Wong, Anatoly B. Rosenfeld, Wolfgang A. Tome
Improvements In Dose Calculation Accuracy For Small Off-Axis Targets In High Dose Per Fraction Tomotherapy, Nicholas Hardcastle, Adam Bayliss, Jeannie Wong, Anatoly B. Rosenfeld, Wolfgang A. Tome
Faculty of Engineering and Information Sciences - Papers: Part A
Purpose: A recent field safety notice from TomoTherapy detailed the underdosing of small, off-axis targets when receiving high doses per fraction. This is due to angular undersampling in the dose calculation gantry angles. This study evaluates a correction method to reduce the underdosing, to be implemented in the current version (v4.1) of the TomoTherapy treatment planning software. Methods: The correction method, termed "Super Sampling" involved the tripling of the number of gantry angles from which the dose is calculated during optimization and dose calculation. Radiochromic film was used to measure the dose to small targets at various off-axis distances receiving …
The Seven-Level Flying Capacitor Based Anpc Converter For Grid Intergration Of Utility-Scale Pv Systems, Georgios Konstantinou, Sridhar R. Pulikanti, Mihai Ciobotaru, Vassilios G. Agelidis, Kashem Muttaqi
The Seven-Level Flying Capacitor Based Anpc Converter For Grid Intergration Of Utility-Scale Pv Systems, Georgios Konstantinou, Sridhar R. Pulikanti, Mihai Ciobotaru, Vassilios G. Agelidis, Kashem Muttaqi
Faculty of Engineering and Information Sciences - Papers: Part A
The installed capacity of grid connected PV plants has increased significantly over the past few years and is expected to continue its growth over the next decade due to the continuous demand for renewable energy and distributed generation systems. This paper presents a seven-level flying capacitor (FC) based active neutral point clamped (ANPC) converter for the connection of utility-scale PV system to the electricity grid. The multilevel voltage output of the topology provides high quality waveforms while maintaining the operational characteristics of NPC based converters for PV systems. The converter topology together with a method to regulate the FC voltages …