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Articles 271 - 300 of 14367

Full-Text Articles in Social and Behavioral Sciences

Puncturable Encryption: A Generic Construction From Delegatable Fully Key-Homomorphic Encryption, Willy Susilo, Dung Hoang Duong, Quoc Huy Le, Josef Pieprzyk Jan 2020

Puncturable Encryption: A Generic Construction From Delegatable Fully Key-Homomorphic Encryption, Willy Susilo, Dung Hoang Duong, Quoc Huy Le, Josef Pieprzyk

Faculty of Engineering and Information Sciences - Papers: Part B

© Springer Nature Switzerland AG 2020. Puncturable encryption (PE), proposed by Green and Miers at IEEE S&P 2015, is a kind of public key encryption that allows recipients to revoke individual messages by repeatedly updating decryption keys without communicating with senders. PE is an essential tool for constructing many interesting applications, such as asynchronous messaging systems, forward-secret zero round-trip time protocols, public-key watermarking schemes and forward-secret proxy re-encryptions. This paper revisits PEs from the observation that the puncturing property can be implemented as efficiently computable functions. From this view, we propose a generic PE construction from the fully key-homomorphic encryption, …

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Periodic Lattice Porous Structure Produced By Selective Laser Melting: Process, Experiment And Numerical Simulation Analysis, Jianrui Zhang, Min Chi, Bo Qian, Zhijun Qiu Jan 2020

Periodic Lattice Porous Structure Produced By Selective Laser Melting: Process, Experiment And Numerical Simulation Analysis, Jianrui Zhang, Min Chi, Bo Qian, Zhijun Qiu

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 Tech Science Press. All rights reserved. To accurately perform the coupled simulation of temperature field and stress field of complex parts and porous structures under the optimal manufacturing process parameters, three kinds of porous structures with different complexity were designed in this paper. Firstly, ANSYS additive software was used to conduct the stress/deformation simulation of the whole structure under different scanning strategies. Secondly, the optimal scanning strategy for different porous structures was determined, then the experimental preparation was performed, and mechanical properties of compression were tested and studied. The results show that the elastic modulus and yield strength …

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Increase In Volumetric Electrical Power Density Of A Linear Generator By Winding Optimization For Wave Energy Extraction, Selim Molla, Omar Farrok, Abidur Rahman, Md Samiul Bashir, Md Rabiul Islam, Abbas Z. Zouzani, M. A Parvez Mahmud Jan 2020

Increase In Volumetric Electrical Power Density Of A Linear Generator By Winding Optimization For Wave Energy Extraction, Selim Molla, Omar Farrok, Abidur Rahman, Md Samiul Bashir, Md Rabiul Islam, Abbas Z. Zouzani, M. A Parvez Mahmud

Faculty of Engineering and Information Sciences - Papers: Part B

In this article, a method of winding optimization of the linear generator is proposed to increase the electrical power generation from the oceanic wave. A linear generator is designed in the ANSYS/Maxwell environment to analyze the proposed winding optimization method. The electrical and magnetic properties of the generator are extensively analyzed. The cross-sectional area and the number of turns of the copper conductor are optimized to maximize the output power. Load characteristics are also considered for different conductor sizes and turn numbers to determine a suitable operating point. A cooling system is also incorporated in the optimized linear generator to …

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Hydrological Drought In Dongting Lake Area (China) After The Running Of Three Gorges Dam And A Possible Solution, Yizhuang Liu, Shu-Qing Yang, Changbo Jiang, Yuannan Long, Bin Deng, Shixiong Yan Jan 2020

Hydrological Drought In Dongting Lake Area (China) After The Running Of Three Gorges Dam And A Possible Solution, Yizhuang Liu, Shu-Qing Yang, Changbo Jiang, Yuannan Long, Bin Deng, Shixiong Yan

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Dongting Lake is located at the downstream of Three Gorges Dam (TGD) and the hydrological drought is intensified after the impoundment of TGD as the dry period has been extended from 123 days/year before the operation of TGD (1981–2002) to 141 days/year (2003–2016) on average. Particularly, the Dongting Lake’s water shortage becomes very severe. To solve the problem caused by upstream dams, an innovative flood control scheme (IFCS) was introduced, and its feasibility of application in Dongting Lake is studied using the hydrodynamic module of Mike 21. The results show the …

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Role Of Tio2 Phase Composition Tuned By Lioh On The Electrochemical Performance Of Dual-Phase Li4ti5o12-Tio2 Microrod As An Anode For Lithium-Ion Battery, Lukman Noerochim, Wahyu Caesarendra, Abdulloh Habib, - Widyastuti, - Suwarno, Yatim Nimah, Achmad Subhan, Bambang Prihandoko, Buyung Kosasih Jan 2020

Role Of Tio2 Phase Composition Tuned By Lioh On The Electrochemical Performance Of Dual-Phase Li4ti5o12-Tio2 Microrod As An Anode For Lithium-Ion Battery, Lukman Noerochim, Wahyu Caesarendra, Abdulloh Habib, - Widyastuti, - Suwarno, Yatim Nimah, Achmad Subhan, Bambang Prihandoko, Buyung Kosasih

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. In this study, a dual-phase Li4Ti5O12-TiO2 microrod was successfully prepared using a modified hydrothermal method and calcination process. The stoichiometry of LiOH as precursor was varied at mol ratio of 0.9, 1.1, and 1.3, to obtain the appropriate phase composition between TiO2 and Li4Ti5O12. Results show that TiO2 content has an important role in increasing the specific capacity of electrodes. The refinement of X-ray diffraction patterns by Rietveld analysis confirm that increasing the LiOH stoichiometry suppresses the TiO2 phase. In the scanning electron microscopy images, the microrod morphology was formed after …

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Numerical Study On The Fracture Characteristics And Failure Mode Of Hard Coal Under Coupled Static And Dynamic Loads, Lihai Tan, Ting X. Ren, Xiaohan Yang, Xueqiu He Jan 2020

Numerical Study On The Fracture Characteristics And Failure Mode Of Hard Coal Under Coupled Static And Dynamic Loads, Lihai Tan, Ting X. Ren, Xiaohan Yang, Xueqiu He

Faculty of Engineering and Information Sciences - Papers: Part B

© The Authors, published by EDP Sciences, 2020. It has been well accepted by mining researchers that coal tends to undergo abrupt fracture under the coupling effect of dynamic and static loads. Hence, the study of influence of coupled static and dynamic loads on coal failure behaviour is meaningful for the understanding of coal burst. In this paper, PFC modelling of SHPB test is adopted to investigate the fracture mode and energy evolution of Australian hard coal under different combinations of pre-stress levels and impact velocities. Results have shown that high dynamic load will make the fracture mode and energy …

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Impact Of Magnetic Field Regulation In Conjunction With The Volumetric Repainting Technique On The Spot Positions And Beam Range In Pencil Beam Scanning Proton Therapy, Suresh B Rana, Jaafar Bennouna, Alonso Gutierrez, Anatoly B. Rosenfeld Jan 2020

Impact Of Magnetic Field Regulation In Conjunction With The Volumetric Repainting Technique On The Spot Positions And Beam Range In Pencil Beam Scanning Proton Therapy, Suresh B Rana, Jaafar Bennouna, Alonso Gutierrez, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine Purpose: The objective of this study was to evaluate the impact of the magnetic field regulation in conjunction with the volumetric repainting technique on the spot positions and range in pencil beam scanning proton therapy. Methods: “Field regulation” — a feature to reduce the switching time between layers by applying a magnetic field setpoint (instead of a current setpoint) has been implemented on the proton beam delivery system at the Miami Cancer Institute. To investigate the …

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Evaluation Of Gate-Rtion (Gate/Geant4) Monte Carlo Simulation Settings For Proton Pencil Beam Scanning Quality Assurance, Carla Winterhalter, Michael Taylor, David Boersma, Alessio Elia, Susanna Guatelli, Ranald Mackay, Karen Kirkby, Lydia Maigne, Vladimir Ivanchenko, Andreas Resch, David Sarrut, Peter Sitch, Marie Vidal, Loic Grevillot, Adam Aitkenhead Jan 2020

Evaluation Of Gate-Rtion (Gate/Geant4) Monte Carlo Simulation Settings For Proton Pencil Beam Scanning Quality Assurance, Carla Winterhalter, Michael Taylor, David Boersma, Alessio Elia, Susanna Guatelli, Ranald Mackay, Karen Kirkby, Lydia Maigne, Vladimir Ivanchenko, Andreas Resch, David Sarrut, Peter Sitch, Marie Vidal, Loic Grevillot, Adam Aitkenhead

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 The Authors. Medical Physics published by Wiley Periodicals LLC on behalf of American Association of Physicists in Medicine. Purpose: Geant4 is a multi-purpose Monte Carlo simulation tool for modeling particle transport in matter. It provides a wide range of settings, which the user may optimize for their specific application. This study investigates GATE/Geant4 parameter settings for proton pencil beam scanning therapy. Methods: GATE8.1/Geant4.10.3.p03 (matching the versions used in GATE-RTion1.0) simulations were performed with a set of prebuilt Geant4 physics lists (QGSP_BIC, QGSP_BIC_EMY, QGSP_BIC_EMZ, QGSP_BIC_HP_EMZ), using 0.1mm-10mm as production cuts on secondary particles (electrons, photons, positrons) and varying the …

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Static And Dynamic Testing Of Tendons, Naj Aziz, Saman Khaleghparast, Sina Anzanpour, Alex M. Remennikov, Ali Mirzaghorbanali Jan 2020

Static And Dynamic Testing Of Tendons, Naj Aziz, Saman Khaleghparast, Sina Anzanpour, Alex M. Remennikov, Ali Mirzaghorbanali

Faculty of Engineering and Information Sciences - Papers: Part B

© The Authors, published by EDP Sciences, 2020. Underground support system using tendons has been one of the significant achievements in Civil and Mining engineering endeavours in facing challenges of ground control. However, shear failure of rock bolts is still one of the least monitored phenomenon in underground excavations with respect to seismic events. The understanding of the performance of rock bolts under dynamic loading condition requires a great deal of research. A series of tests were undertaken utilising a drop hammer mass of 600 Kg from a maximum height of 3.7 m over concrete blocks in the double shear …

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Eco-Friendly Water-Based Nanolubricants For Industrial-Scale Hot Steel Rolling, Hui Wu, Hamidreza Kamali, Mingshuai Huo, Fei Lin, Shuiquan Huang, Han Huang, Sihai Jiao, Zhao Xing, Zhengyi Jiang Jan 2020

Eco-Friendly Water-Based Nanolubricants For Industrial-Scale Hot Steel Rolling, Hui Wu, Hamidreza Kamali, Mingshuai Huo, Fei Lin, Shuiquan Huang, Han Huang, Sihai Jiao, Zhao Xing, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

Eco-friendly and low-cost water-based nanolubricants containing rutile TiO2 nanoparticles (NPs) were developed for accelerating their applications in industrial-scale hot steel rolling. The lubrication performance of developed nanolubricants was evaluated in a 2-high Hille 100 experimental rolling mill at a rolling temperature of 850◦ C in comparison to that of pure water. The results indicate that the use of nanolubricant enables one to decrease the rolling force, reduce the surface roughness and the oxide scale thickness, and enhance the surface hardness. In particular, the nanolubricant consisting of 4 wt % TiO2, 10 wt % glycerol, 0.2 wt …

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On Masking And Releasing Smart Meter Data At Micro-Level: The Multiplicative Noise Approach, John Brackenbury, P. Y. O'Shaughnessy, Yan-Xia Lin Jan 2020

On Masking And Releasing Smart Meter Data At Micro-Level: The Multiplicative Noise Approach, John Brackenbury, P. Y. O'Shaughnessy, Yan-Xia Lin

Faculty of Engineering and Information Sciences - Papers: Part B

Smart meter electricity data presents privacy risks when malicious agents gain insights of private information, including residents’ lifestyle and daily habits. When allowing access to record-level data, we apply the multiplicative noise method to mask individual smart meter data, which simultaneously aims to minimise disclosure of a dwelling’s consumption signal to any third party and to enable accurate estimation of the sum of a cluster of households. Three testing criteria are introduced to measure the performance of multiplicative noise masking approach relevant to the smart meter data. We propose a novel ‘Twin Uniform’ noise distribution and derive relevant theoretical results. …

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An Exploration Of Iot Platform Development, Mahdi Fahmidehgholami, Didar Zowghi Jan 2020

An Exploration Of Iot Platform Development, Mahdi Fahmidehgholami, Didar Zowghi

Faculty of Engineering and Information Sciences - Papers: Part B

IoT (Internet of Things) platforms are key enablers for smart city initiatives, targeting the improvement of citizens' quality of life and economic growth. As IoT platforms are dynamic, proactive, and heterogeneous socio-technical artefacts, systematic approaches are required for their development. Limited surveys have exclusively explored how IoT platforms are developed and maintained from the perspective of information system development process lifecycle. In this paper, we present a detailed analysis of 63 approaches. This is accomplished by proposing an evaluation framework as a cornerstone to highlight the characteristics, strengths, and weaknesses of these approaches. The survey results not only provide insights …

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Pricing Variance And Volatility Swaps With Stochastic Volatility, Stochastic Interest Rate And Regime Switching, Sha Lin, Xinjiang He Jan 2020

Pricing Variance And Volatility Swaps With Stochastic Volatility, Stochastic Interest Rate And Regime Switching, Sha Lin, Xinjiang He

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, we propose a two-factor Heston-CIR hybrid model for the pricing of variance and volatility swaps, by introducing the second regime switching factor into the Heston-CIR hybrid model. While this model is closer to reality, taking advantages of the Heston stochastic volatility, CIR stochastic interest rate and regime switching, it has a more complicated structure and thus leads to extra difficulty in finding analytical solutions. Albeit difficult, we have still managed to present analytical pricing formulae for variance and volatility swaps, based on the derived forward characteristic function in a series form. The series solutions are accompanied by …

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Numerical Simulations Of Circular High Strength Concrete-Filled Aluminum Tubular Short Columns Incorporating New Concrete Confinement Model, Vipulkumar I. Patel, Qing Quan Liang, Muhammad N. S Hadi Jan 2020

Numerical Simulations Of Circular High Strength Concrete-Filled Aluminum Tubular Short Columns Incorporating New Concrete Confinement Model, Vipulkumar I. Patel, Qing Quan Liang, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

Concrete-filled aluminum tubular (CFAT) columns have the advantages of a lightweight, high resistance to corrosion, good appearance and ease of maintenance over concrete-filled steel tubular (CFST) columns. However, experimental and computational studies on the performance of CFAT columns have rarely been reported. This paper concerns with the fiber-based numerical analysis, structural behavior, and design of circular high strength CFAT stub columns loaded concentrically. A new concrete confinement model for computing the lateral pressures on the concrete core in CFAT circular columns is proposed and implemented in the computational model. The numerical analysis procedure is given for the determination of the …

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Organisational-Level Assessment Of Cloud Computing Adoption: Evidence From The Australian Smes, Salim Al Isma'ili, Mengxiang Li, Jun Shen, Pu Huang, Qiang He, Wu Zhan Jan 2020

Organisational-Level Assessment Of Cloud Computing Adoption: Evidence From The Australian Smes, Salim Al Isma'ili, Mengxiang Li, Jun Shen, Pu Huang, Qiang He, Wu Zhan

Faculty of Engineering and Information Sciences - Papers: Part B

Cloud Computing (CC) is an emerging technology that can potentially revolutionise the application and delivery of IT. There has been little research, however, into the adoption of CC in Small and Medium-Sized Enterprises (SMEs). The indicators show that CC has been adopted very slowly. There is also a significant research gap in the investigation of the adoption of this innovation in SMEs. This article explores how the adoption of CC in Australia is related to technological factors, risk factors, and environmental factors. The study provides useful insights that can be utilised practically by SMEs, policymakers, and cloud vendors.

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Considerations For Assessing Stability Of Wastewater-Based Epidemiology Biomarkers Using Biofilm-Free And Sewer Reactor Tests, Phil Choi, Jiaying Li, Jianfa Gao, Jake O'Brien, Kevin Thomas, Phong Thai, Guangming Jiang, Jochen Mueller Jan 2020

Considerations For Assessing Stability Of Wastewater-Based Epidemiology Biomarkers Using Biofilm-Free And Sewer Reactor Tests, Phil Choi, Jiaying Li, Jianfa Gao, Jake O'Brien, Kevin Thomas, Phong Thai, Guangming Jiang, Jochen Mueller

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Wastewater-based epidemiology is an increasingly popular method for analysing drugs or metabolites excreted by populations. The in-sewer transformation of biomarkers is important but often receives little consideration in published studies. Many studies publish stability under biofilm-free conditions only, which do not represent actual sewer conditions. This study aims to fill a gap in the field by comparing the wastewater stability of 33 licit drug and pharmaceutical biomarkers in biofilm-free (BFF) conditions to stability in sewer biofilm reactors. All but one biomarker was stable under BFF conditions, whereas most transformed in sewer biofilm reactors. Sewer reactor results tended to overestimate …

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Improving Wastewater Management Using Free Nitrous Acid (Fna), Haoran Duan, Shuhong Gao, Xuan Li, Nur Ab Hamid, Guangming Jiang, Min Zheng, Xue Bai, Philip Bond, Xuanyu Lu, Mariella Chislett, Shihu Hu, Liu Ye, Zhiguo Yuan Jan 2020

Improving Wastewater Management Using Free Nitrous Acid (Fna), Haoran Duan, Shuhong Gao, Xuan Li, Nur Ab Hamid, Guangming Jiang, Min Zheng, Xue Bai, Philip Bond, Xuanyu Lu, Mariella Chislett, Shihu Hu, Liu Ye, Zhiguo Yuan

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Elsevier Ltd Free nitrous acid (FNA), the protonated form of nitrite, has historically been an unwanted substance in wastewater systems due to its inhibition on a wide range of microorganisms. However, in recent years, advanced understanding of FNA inhibitory and biocidal effects on microorganisms has led to the development of a series of FNA-based applications that improve wastewater management practices. FNA has been used in sewer systems to control sewer corrosion and odor; in wastewater treatment to achieve carbon and energy efficient nitrogen removal; in sludge management to improve the sludge reduction and energy recovery; in membrane systems to …

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Geogrid-Confined Pervious Geopolymer Concrete Piles With Frp-Pvc-Confined Concrete Core: Analytical Models, Haiqiu Zhang, Muhammad N. S Hadi Jan 2020

Geogrid-Confined Pervious Geopolymer Concrete Piles With Frp-Pvc-Confined Concrete Core: Analytical Models, Haiqiu Zhang, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Institution of Structural Engineers The geogrid-confined pervious geopolymer concrete pile (GPGCP) with fibre reinforced polymer (FRP)-polyvinyl chloride (PVC)-confined concrete core (FPCC) is a new form of composite piles proposed in a previous study, which consists of a circular geogrid outer tube, a FPCC, and pervious geopolymer concrete (PGC) filled in between. For FPCC, the normal geopolymer concrete (NGC) was used to fill the FRP-PVC tubes. In this study, new analytical models are proposed to simulate the axial compressive behaviour of GPGCPs without and with FPCC. According to the characteristics of the mechanical behaviour of GPGCPs, analytical models are proposed …

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Experimental And Numerical Investigations Of Eccentrically Loaded Rectangular Concrete-Filled Double Steel Tubular Columns, Mizen Ahmed, Qing Quan Liang, Vipulkumar I. Patel, Muhammad N. S Hadi Jan 2020

Experimental And Numerical Investigations Of Eccentrically Loaded Rectangular Concrete-Filled Double Steel Tubular Columns, Mizen Ahmed, Qing Quan Liang, Vipulkumar I. Patel, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

Rectangular concrete-filled double steel tubular (CFDST) columns have increasingly been utilized in high-rise buildings to support heavy loads. However, the responses of eccentrically loaded rectangular CFDST short columns have rarely been studied. This paper reports experimental and numerical investigations into the behavior of rectangular thin-walled short CFDST columns composed of a rectangular inner steel tube loaded eccentrically. Tests on rectangular and square CFDST short columns under eccentric loading and axial loading were carried out to examine their responses to various design parameters, including the cross-sectional dimensions, loading eccentricity, and width-to-thickness ratios of the external and internal tubes. The experimental program …

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Homes With Higher Energy Ratings Sell For More. Here’S How Australian Owners Could Cash In, Daniel J. Daly Jan 2020

Homes With Higher Energy Ratings Sell For More. Here’S How Australian Owners Could Cash In, Daniel J. Daly

Faculty of Engineering and Information Sciences - Papers: Part B

Everybody wants an energy-efficient home. After all, an energy-efficient home is comfortable to live in, without large energy bills. These can be important factors for prospective home owners or renters. Our review of international research found energy-efficient homes typically fetch a higher price.

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Research On Fault Detection For Three Types Of Wind Turbine Subsystems Using Machine Learning, Zuojun Liu, Cheng Xiao, Tieling Zhang, Xu Zhang Jan 2020

Research On Fault Detection For Three Types Of Wind Turbine Subsystems Using Machine Learning, Zuojun Liu, Cheng Xiao, Tieling Zhang, Xu Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

2020 by the authors. In wind power generation, one aim of wind turbine control is to maintain it in a safe operational status while achieving cost-effective operation. The purpose of this paper is to investigate new techniques for wind turbine fault detection based on supervisory control and data acquisition (SCADA) system data in order to avoid unscheduled shutdowns. The proposed method starts with analyzing and determining the fault indicators corresponding to a failure mode. Three main system failures including generator failure, converter failure and pitch system failure are studied. First, the indicators data corresponding to each of the three key …

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Interfacial Microstructure And Shear Strength Of Tc4 Alloy Joints Vacuum Brazed With Ti-Zr-Ni-Cu Filler Metal, Shilei Liu, Jiakai Miao, Weiwei Zhang, Ran Wei, Chen Chen, Tan Wang, Wuduo Zhao, Zhengyi Jiang, Fushan Li Jan 2020

Interfacial Microstructure And Shear Strength Of Tc4 Alloy Joints Vacuum Brazed With Ti-Zr-Ni-Cu Filler Metal, Shilei Liu, Jiakai Miao, Weiwei Zhang, Ran Wei, Chen Chen, Tan Wang, Wuduo Zhao, Zhengyi Jiang, Fushan Li

Faculty of Engineering and Information Sciences - Papers: Part B

2020 Elsevier B.V. Ti-6Al-4V alloy was successfully vacuum brazed with a commercial Ti-37.5Zr-10Ni-15Cu (wt.%) filler metal. The effect of brazing temperature and time on the microstructure and shear strength of the brazed joints were investigated. When the brazing temperature was 905 °C for 10 min, the typical interfacial microstructure of the brazed joint were a single layer of α-Ti with a high concentration of Ti, α-Ti, (Ti, Zr)2(Cu, Ni) intermetallic compound and eutectoid microstructure. Increasing the brazing temperature and time are beneficial to eliminate the (Ti, Zr)2(Cu, Ni) intermetallic compound that degrades the properties in the brazed joint. The shear …

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Air Void Detection Using Variational Mode Decomposition With Low Rank, Fok Hing Chi Tivive, Abdesselam Bouzerdoum, Shivakumar Karekal Jan 2020

Air Void Detection Using Variational Mode Decomposition With Low Rank, Fok Hing Chi Tivive, Abdesselam Bouzerdoum, Shivakumar Karekal

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents an air-void detection technique for air-coupled radar, which emits electromagnetic waves to interrogate an air-void inside a medium or between two media. The reflections from the air-medium interfaces are usually corrupted by air-coupling, antenna ringing, and internal reflections, rendering air-void detection very difficult or, in certain cases, impossible. The proposed method exploits the low-rank structure of the background clutter to suppress these nuisance signals. A variational mode decomposition model is developed to extract the backscattering at different air-medium interfaces as signal modes. Real experiments are conducted using a stepped frequency radar. The experimental results show that the …

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Qr Code Watermarking For Digital Images, Yang-Wai Chow, Willy Susilo, Joon Sang Baek, Jongkil Kim Jan 2020

Qr Code Watermarking For Digital Images, Yang-Wai Chow, Willy Susilo, Joon Sang Baek, Jongkil Kim

Faculty of Engineering and Information Sciences - Papers: Part B

2020, Springer Nature Switzerland AG. With the growing use of online digital media, it is becoming increasingly challenging to protect copyright and intellectual property. Data hiding techniques like digital watermarking can be used to embed data within a signal for purposes such as digital rights management. This paper investigates a watermarking technique for digital images using QR codes. The advantage of using QR codes for watermarking is that properties of the QR code structure include error correction and high data capacity. This paper proposes a QR code watermarking technique, and examines its robustness and security against common digital image attacks.

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An Ab Initio Study On The Effects Of Na Passivation On Friction Reduction Of An Iron Oxide Surface, Nam Van Tran, Anh Kiet Tieu, Hongtao Zhu, Thi Thuy Huong Ta, Manh Ha Le, Thi D. Ta Jan 2020

An Ab Initio Study On The Effects Of Na Passivation On Friction Reduction Of An Iron Oxide Surface, Nam Van Tran, Anh Kiet Tieu, Hongtao Zhu, Thi Thuy Huong Ta, Manh Ha Le, Thi D. Ta

Faculty of Engineering and Information Sciences - Papers: Part B

The presence of sodium-rich layers on iron oxide surfaces plays an important role in the functionality of glassy lubricants used in harsh working conditions of metal formation. However, the underlying low-friction mechanism of the sodium layer on iron oxide surfaces at the atomic level is not well understood. In this work, Na adsorption on the most stable surface of Fe2O3 (0001) is studied by density functional theory. The most stable adsorption configuration and the modifications induced by the adsorption on the structural as well as the electronic properties of the surface are discussed. By constructing the potential …

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Three-Dimensional Velocity Distribution In Straight Smooth Channels Modeled By Modified Log-Law, Shu-Qing Yang, Muhammad Zain Bin Riaz, Muttucumaru Sivakumar, Keith Enever, Nadeeka Miguntanna Jan 2020

Three-Dimensional Velocity Distribution In Straight Smooth Channels Modeled By Modified Log-Law, Shu-Qing Yang, Muhammad Zain Bin Riaz, Muttucumaru Sivakumar, Keith Enever, Nadeeka Miguntanna

Faculty of Engineering and Information Sciences - Papers: Part B

Time-average velocity distribution in steady and uniform channel flows is important for fundamental research and practical application as it is always three-dimensional (3D), regardless of channel geometry. However, its determination has predominantly been carried out by using complex numerical software, even for the simplest geometry such as rectangular channels. The log-law was developed initially for circular pipe flows, where a single shear velocity is used to normalize the velocity (u+) and its distance (y+). Tracy and Lester found that the performance of the log-law can be extended to express velocity profiles in rectangular channels when the global shear velocities (gRS)0.5 …

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Effects Of Nano-Clay Content, Foaming Temperature And Foaming Time On Density And Cell Size Of Pvc Matrix Foam By Presented Least Absolute Shrinkage And Selection Operator Statistical Regression Via Suitable Experiments As A Function Of Mmt Content, Zhixiong Li, Hamzeh Shahrajabian, Seyed Amin Bagherzadeh, Hamid Jadidi, Arash Karimipour, Iskander Tlili Jan 2020

Effects Of Nano-Clay Content, Foaming Temperature And Foaming Time On Density And Cell Size Of Pvc Matrix Foam By Presented Least Absolute Shrinkage And Selection Operator Statistical Regression Via Suitable Experiments As A Function Of Mmt Content, Zhixiong Li, Hamzeh Shahrajabian, Seyed Amin Bagherzadeh, Hamid Jadidi, Arash Karimipour, Iskander Tlili

Faculty of Engineering and Information Sciences - Papers: Part B

Present article aims to investigate the effect of nano-clay content, foaming temperature and foaming time on the density and cell size of the PVC matrix foam. The cell size would affect the insulating and mechanical properties. The foaming temperature is set in three levels of 70, 80 and 90 °C, foaming time is set in three levels of 10, 20, and 30 s; and nano-clay is in content of 1, 3, and 5 wt%. Outputs consist the density and cell size, which affect impact the thermal conductivity, mechanical properties and the weight of the polymer foam. In addition the Least …

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Validation Of Geant4 For Silicon Microdosimetry In Heavy Ion Therapy, David Bolst, Susanna Guatelli, Linh T. Tran, Lachlan Chartier, Jeremy A. Davis, Giordano Biasi, Dale A. Prokopovich, Alex Pogossov, Mark I. Reinhard, Marco Petasecca, Michael L. F Lerch, N Matsufuji, M Povoli, A Summanwar, Angela Kok, Michael A. Jackson, Anatoly B. Rosenfeld Jan 2020

Validation Of Geant4 For Silicon Microdosimetry In Heavy Ion Therapy, David Bolst, Susanna Guatelli, Linh T. Tran, Lachlan Chartier, Jeremy A. Davis, Giordano Biasi, Dale A. Prokopovich, Alex Pogossov, Mark I. Reinhard, Marco Petasecca, Michael L. F Lerch, N Matsufuji, M Povoli, A Summanwar, Angela Kok, Michael A. Jackson, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

Microdosimetry is a particularly powerful method to estimate the relative biological effectiveness (RBE) of any mixed radiation field. This is particularly convenient for therapeutic heavy ion therapy (HIT) beams, referring to ions larger than protons, where the RBE of the beam can vary significantly along the Bragg curve. Additionally, due to the sharp dose gradients at the end of the Bragg peak (BP), or spread out BP, to make accurate measurements and estimations of the biological properties of a beam a high spatial resolution is required, less than a millimetre. This requirement makes silicon microdosimetry particularly attractive due to the …

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Great Expectations And Even Greater Exceedances From Spatially Referenced Data, Noel A. Cressie, Thomas F. Suesse Jan 2020

Great Expectations And Even Greater Exceedances From Spatially Referenced Data, Noel A. Cressie, Thomas F. Suesse

Faculty of Engineering and Information Sciences - Papers: Part B

2020 Elsevier B.V. We clear land for agricultural purposes, we draw water from streams and aquifers, and we build houses in coastal regions for their ready access to the sea. Our need for food, water, and shelter is basic, but so is variability in our natural environment. Understanding this is key to the long-term sustainability of the anthropocene. At any location in the environment, long-term temporal averages may indicate regions that exceed sustainability thresholds. For example, environmental thresholds might be used by insurance companies to set the prices of insurance premiums. In this article, we present the problem of spatial-statistical …

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Independent Review Of 4dct Scans Used For Sabr Treatment Planning, Rachitha Antony, Peta Lonski, Elena Ungureanu, Nicholas G. Hardcastle, Adam Yeo, Shankar Siva, Tomas Kron Jan 2020

Independent Review Of 4dct Scans Used For Sabr Treatment Planning, Rachitha Antony, Peta Lonski, Elena Ungureanu, Nicholas G. Hardcastle, Adam Yeo, Shankar Siva, Tomas Kron

Faculty of Engineering and Information Sciences - Papers: Part B

2020 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine. Four-dimensional computerized tomography (4DCT) is required for stereotactic ablative body radiotherapy (SABR) of mobile targets to account for tumor motion during treatment planning and delivery. In this study, we report on the impact of an image review quality assurance process performed prior to treatment planning by medical physicists for 4DCT scans used for SABR treatment. Reviews were performed of 211 4DCT scans (193 patients) over a 3-yr period (October 2014 to October 2017). Treatment sites included lung …

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