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Articles 1471 - 1500 of 14367

Full-Text Articles in Social and Behavioral Sciences

Deformation Twinning And Dislocation Processes In Nanotwinned Copper By Molecular Dynamics Simulations, Xing Zhao, Cheng Lu, Anh Kiet Tieu, Lihua Zhan, Minghui Huang, Lihong Su, Linqing Pei, Liang Zhang Jan 2018

Deformation Twinning And Dislocation Processes In Nanotwinned Copper By Molecular Dynamics Simulations, Xing Zhao, Cheng Lu, Anh Kiet Tieu, Lihua Zhan, Minghui Huang, Lihong Su, Linqing Pei, Liang Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

Nanotwinned materials exhibit a combination of high strength and good ductility which is attributed to the interactions between dislocations and twin boundaries. But no attempt has been made to explore the possibility for deformation twinning in nanotwinned face-centered cubic materials. Here we use large scale molecular dynamics simulations to elucidate the mechanical behaviour of nanotwinned Cu. We demonstrate that deformation twinning plays an important role in the deformation of nanotwinned Cu with specific twin orientations, in addition to conventional dislocation slip. Deformation twins are formed through the glide of Shockley partials on adjacent {1  1  1} slip planes and two …

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Multiple Speech Source Separation Using Inter-Channel Correlation And Relaxed Sparsity, Maoshen Jia, Jundai Sun, Xiguang Zheng Jan 2018

Multiple Speech Source Separation Using Inter-Channel Correlation And Relaxed Sparsity, Maoshen Jia, Jundai Sun, Xiguang Zheng

Faculty of Engineering and Information Sciences - Papers: Part B

In this work, a multiple speech source separation method using inter-channel correlation and relaxed sparsity is proposed. A B-format microphone with four spatially located channels is adopted due to the size of the microphone array to preserve the spatial parameter integrity of the original signal. Specifically, we firstly measure the proportion of overlapped components among multiple sources and find that there exist many overlapped time-frequency (TF) components with increasing source number. Then, considering the relaxed sparsity of speech sources, we propose a dynamic threshold-based separation approach of sparse components where the threshold is determined by the inter-channel correlation among the …

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Tunable Smart Digital Structure (Sds) To Modularly Assemble Soft Actuators With Layered Adhesive Bonding, Hu Jin, Erbao Dong, Min Xu, Qirong Xia, Shuai Liu, Weihua Li, Jie Yang Jan 2018

Tunable Smart Digital Structure (Sds) To Modularly Assemble Soft Actuators With Layered Adhesive Bonding, Hu Jin, Erbao Dong, Min Xu, Qirong Xia, Shuai Liu, Weihua Li, Jie Yang

Faculty of Engineering and Information Sciences - Papers: Part B

Many shape memory alloy (SMA)-based soft actuators have specific composite structures and manufacture processes, and are therefore unique. However, these exclusive characteristics limit their capabilities and applications, so in this article a soft and smart digital structure (SDS) is proposed that acts like a modular unit to assemble soft actuators by a layered adhesive bonding process. The SDS is a fully soft structure that encapsulates a digital skeleton consisting of four groups of parallel and independently actuated SMA wires capable of outputting a four-channel tunable force. The layered adhesive bonding process modularly bonds several SDSs with an elastic backbone to …

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Developing A Theoretical Model And Questionnaire Survey Instrument To Measure The Success Of Electronic Health Records In Residential Aged Care, Ping Yu, Siyu Qian Jan 2018

Developing A Theoretical Model And Questionnaire Survey Instrument To Measure The Success Of Electronic Health Records In Residential Aged Care, Ping Yu, Siyu Qian

Faculty of Engineering and Information Sciences - Papers: Part B

Electronic health records (EHR) are introduced into healthcare organizations worldwide to improve patient safety, healthcare quality and efficiency. A rigorous evaluation of this technology is important to reduce potential negative effects on patient and staff, to provide decision makers with accurate information for system improvement and to ensure return on investment. Therefore, this study develops a theoretical model and questionnaire survey instrument to assess the success of organizational EHR in routine use from the viewpoint of nursing staff in residential aged care homes. The proposed research model incorporates six variables in the reformulated DeLone and McLean information systems success model: …

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Effect Of Geogrid Reinforcement On The Flexural Behaviour Of Concrete Pavements, Abbas Sahib Abd-Ali Al-Hedad, Muhammad N. S Hadi Jan 2018

Effect Of Geogrid Reinforcement On The Flexural Behaviour Of Concrete Pavements, Abbas Sahib Abd-Ali Al-Hedad, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents results of an investigation of the effect of geogrid reinforcement on the flexural behaviour of concrete pavements. Six concrete slab specimens having dimensions of 900 x 900 x 60mm were prepared and tested. Three of the specimens were unreinforced and taken as references. The other three were reinforced with a triaxial geogrid layer located at 40mm from the top of the specimen. To support the specimens during the testing, two layers of recycled rubber having a side dimension of 900mm and a 60mm total thickness were used. According to the location of the applied load, the specimens …

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An Anaerobic Membrane Bioreactor - Membrane Distillation Hybrid System For Energy Recovery And Water Reuse: Removal Performance Of Organic Carbon, Nutrients, And Trace Organic Contaminants, Xiaoye Song, Wenhai Luo, James A. Mcdonald, Faisal I. Hai, Stuart J. Khan, William E. Price, Long D. Nghiem Jan 2018

An Anaerobic Membrane Bioreactor - Membrane Distillation Hybrid System For Energy Recovery And Water Reuse: Removal Performance Of Organic Carbon, Nutrients, And Trace Organic Contaminants, Xiaoye Song, Wenhai Luo, James A. Mcdonald, Faisal I. Hai, Stuart J. Khan, William E. Price, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part B

In this study, a direct contact membrane distillation (MD) unit was integrated with an anaerobic membrane bioreactor (AnMBR) to simultaneously recover energy and produce high quality water for reuse from wastewater. Results show that AnMBR could produce 0.3-0.5 L/g CODadded biogas with a stable methane content of approximately 65%. By integrating MD with AnMBR, bulk organic matter and phosphate were almost completely removed. The removal of the 26 selected trace organic contaminants by AnMBR was compound specific, but the MD process could complement AnMBR removal, leading to an overall efficiency from 76% to complete removal by the integrated system. …

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Formation Of Deformation-Induced Products In A Metastable-B Titanium Alloy During High Temperature Compression, Alireza Samiee, Gilberto Casillas, Mansur Ahmed, Dmytro G. Savvakin, Ryan Naseri, Elena V. Pereloma Jan 2018

Formation Of Deformation-Induced Products In A Metastable-B Titanium Alloy During High Temperature Compression, Alireza Samiee, Gilberto Casillas, Mansur Ahmed, Dmytro G. Savvakin, Ryan Naseri, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part B

A metastable-β titanium alloy, Ti-10V-3Fe-3Al (wt. %), was subjected to thermo-mechanical processing including the compression test at 725 °C, which is below the β transus temperature (780 °C), and at strain rate of 10−3 s−1. The presence of phases was determined using transmission electron microscopy and X-ray diffraction. Although the dynamic recovery took place together with slip, both deformation-induced α” martensite and ω were detected as other operating mechanisms for the first time in metastable-β titanium alloy deformed in α + β region. The volume fraction of stress-induced α” was higher than that of the same alloy …

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Kms States On Generalised Bunce-Deddens Algebras And Their Toeplitz Extensions, David I. Robertson, James Rout, Aidan Sims Jan 2018

Kms States On Generalised Bunce-Deddens Algebras And Their Toeplitz Extensions, David I. Robertson, James Rout, Aidan Sims

Faculty of Engineering and Information Sciences - Papers: Part B

We study the generalised Bunce-Deddens algebras and their Toeplitz extensions constructed by Kribs and Solel from a directed graph and a sequence ω of positive integers. We describe both of these C∗-algebras in terms of novel universal properties, and prove uniqueness theorems for them; if ω determines an infinite supernatural number, then no aperiodicity hypothesis is needed in our uniqueness theorem for the generalised Bunce-Deddens algebra. We calculate the KMS states for the gauge action in the Toeplitz algebra when the underlying graph is finite. We deduce that the generalised Bunce-Deddens algebra is simple if and only if it supports …

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On Statistical Approaches To Generate Level 3 Products From Satellite Remote Sensing Retrievals, Andrew Zammit-Mangion, Noel A. Cressie, Clint E. Shumack Jan 2018

On Statistical Approaches To Generate Level 3 Products From Satellite Remote Sensing Retrievals, Andrew Zammit-Mangion, Noel A. Cressie, Clint E. Shumack

Faculty of Engineering and Information Sciences - Papers: Part B

Satellite remote sensing of trace gases such as carbon dioxide (CO 2 ) has increased our ability to observe and understand Earth's climate. However, these remote sensing data, specifically Level 2 retrievals, tend to be irregular in space and time, and hence, spatio-temporal prediction is required to infer values at any location and time point. Such inferences are not only required to answer important questions about our climate, but they are also needed for validating the satellite instrument, since Level 2 retrievals are generally not co-located with ground-based remote sensing instruments. Here, we discuss statistical approaches to construct Level 3 …

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Improved Performance Of Geosynthetics Enhanced Ballast: Laboratory And Numerical Studies, Ngoc Trung Ngo, Buddhima Indraratna, Fernanda Bessa Ferreira, Cholachat Rujikiatkamjorn Jan 2018

Improved Performance Of Geosynthetics Enhanced Ballast: Laboratory And Numerical Studies, Ngoc Trung Ngo, Buddhima Indraratna, Fernanda Bessa Ferreira, Cholachat Rujikiatkamjorn

Faculty of Engineering and Information Sciences - Papers: Part B

Ballasted rail tracks form one of the most important worldwide transportation modes in terms of traffic tonnage, serving the needs of bulk freight and passenger movement. High impact and cyclic loads can cause a significant deformation leading to poor track geometry. In order to mitigate these problems, the concept of the inclusion of geosynthetics in rail tracks is introduced. This paper presents the current state-of-the-art knowledge of rail track geomechanics, including results obtained from laboratory testing, field investigations and numerical modelling to study the load-deformation behaviour of ballast improved by geosynthetics. The shear stress-strain and deformation behaviour of geosynthetic-reinforced ballast …

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Integrated Life Cycle Cost Method For Sustainable Structural Design By Focusing On A Benchmark Office Building In Australia, Mehdi Robati, Timothy J. Mccarthy, Georgios Kokogiannakis Jan 2018

Integrated Life Cycle Cost Method For Sustainable Structural Design By Focusing On A Benchmark Office Building In Australia, Mehdi Robati, Timothy J. Mccarthy, Georgios Kokogiannakis

Faculty of Engineering and Information Sciences - Papers: Part B

Cost has been traditionally known as a key factor that needs to be considered in the decision making process. Recent awareness in environmental problems has highlighted the need for considering environmental impacts into the process of making choices. However, far too little attention has been paid to reflect the environmental impact and the building cost into the decision making process. As such, this study proposed a method that integrates and considers the environmental cost and building cost in the structural design process. This method takes into account the cost associated with building materials, construction methods and amount of embodied carbon …

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Biomimetic Aquaporin Membranes For Osmotic Membrane Bioreactors: Membrane Performance And Contaminant Removal, Wenhai Luo, Ming Xie, Xiaoye Song, Wenshan Guo, Hao H. Ngo, John L. Zhou, Long D. Nghiem Jan 2018

Biomimetic Aquaporin Membranes For Osmotic Membrane Bioreactors: Membrane Performance And Contaminant Removal, Wenhai Luo, Ming Xie, Xiaoye Song, Wenshan Guo, Hao H. Ngo, John L. Zhou, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part B

In this study, we investigated the performance of an osmotic membrane bioreactor (OMBR) enabled by a novel biomimetic aquaporin forward osmosis (FO) membrane. Membrane performance and removal of 30 trace organic contaminants (TrOCs) were examined. Results show that the aquaporin FO membrane had better transport properties in comparison with conventional cellulose triacetate and polyamide thin-film composite FO membranes. In particular, the aquaporin FO membrane exhibited much lower salt permeability and thus smaller reverse salt flux, resulting in a less severe salinity build-up in the bioreactor during OMBR operation. During OMBR operation, the aquaporin FO membrane well complemented biological treatment for …

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Detailed Balance As A Quantum-Group Symmetry Of Kraus Operators, Andreas Andersson Jan 2018

Detailed Balance As A Quantum-Group Symmetry Of Kraus Operators, Andreas Andersson

Faculty of Engineering and Information Sciences - Papers: Part B

A unital completely positive map governing the time evolution of a quantum system is usually called a quantum channel, and it can be represented by a tuple of operators which are then referred to as the Kraus operators of the channel. We look at states of the system whose correlations with respect to the channel have a certain symmetry. Then we show that detailed balance holds if the Kraus operators satisfy a very interesting algebraic relation which plays an important role in the representation theory of any compact quantum group.

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Investigation Of The Radiation Dose From Cone-Beam Ct For Image-Guided Radiotherapy: A Comparison Of Methodologies, Jarryd Buckley, Dean Wilkinson, Alessandra Malaroda, Peter E. Metcalfe Jan 2018

Investigation Of The Radiation Dose From Cone-Beam Ct For Image-Guided Radiotherapy: A Comparison Of Methodologies, Jarryd Buckley, Dean Wilkinson, Alessandra Malaroda, Peter E. Metcalfe

Faculty of Engineering and Information Sciences - Papers: Part B

Four methodologies were evaluated for quantifying kilovoltage cone‐beam computed tomography (CBCT) dose: the Cone‐Beam Dose Index (CBDI), IAEA Report 5 recommended methodology (IAEA), the AAPM Task Group 111 methodology (TG111), and the current dose metric; the Computed Tomography Dose Index (CTDI) on two commercial Varian cone‐beam CT imaging systems; the Clinac iX On‐Board Imager (OBI); and the TrueBeam X‐ray Imaging system (XI). The TG111 methodology measured the highest overall dose (21.199 ± 0.035 mGy OBI and 22.420 ± 0.002 XI for pelvis imaging) due to the full scatter of the TG111 phantom and was within 5% of CTDI measurements taken …

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Linear Shrinkage Estimation Of Covariance Matrices Using Low-Complexity Cross-Validation, Jun Tong, Rui Hu, Jiangtao Xi, Zhitao Xiao, Qinghua Guo, Yanguang Yu Jan 2018

Linear Shrinkage Estimation Of Covariance Matrices Using Low-Complexity Cross-Validation, Jun Tong, Rui Hu, Jiangtao Xi, Zhitao Xiao, Qinghua Guo, Yanguang Yu

Faculty of Engineering and Information Sciences - Papers: Part B

Shrinkage can effectively improve the condition number and accuracy of covariance matrix estimation, especially for low-sample-support applications with the number of training samples smaller than the dimensionality. This paper investigates parameter choice for linear shrinkage estimators. We propose data-driven, leave-one-out cross-validation (LOOCV) methods for automatically choosing the shrinkage coefficients, aiming to minimize the Frobenius norm of the estimation error. A quadratic loss is used as the prediction error for LOOCV. The resulting solutions can be found analytically or by solving optimization problems of small sizes and thus have low complexities. Our proposed methods are compared with various existing techniques. We …

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Micro-Hydromechanical Deep Drawing Of Metal Cups With Hydraulic Pressure Effects, Liang Luo, Zhengyi Jiang, Dongbin Wei, Xiaogang Wang, Cunlong Zhou, Qingxue Huang Jan 2018

Micro-Hydromechanical Deep Drawing Of Metal Cups With Hydraulic Pressure Effects, Liang Luo, Zhengyi Jiang, Dongbin Wei, Xiaogang Wang, Cunlong Zhou, Qingxue Huang

Faculty of Engineering and Information Sciences - Papers: Part B

Micro-metal products have recently enjoyed high demand. In addition, metal microforming has drawn increasing attention due to its net-forming capability, batch manufacturing potential, high product quality, and relatively low equipment cost. Micro-hydromechanical deep drawing (MHDD), a typical microforming method, has been developed to take advantage of hydraulic force. With reduced dimensions, the hydraulic pressure development changes; accordingly, the lubrication condition changes from the macroscale to the microscale. A Voronoi-based finite element model is proposed in this paper to consider the change in lubrication in MHDD according to open and closed lubricant pocket theory. Simulation results agree with experimental results concerning …

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Antibacterial And Antifungal Activity Of Poly(Lactic Acid)-Bovine Lactoferrin Nanofiber Membranes, Raul Machado, André Da Costa, Dina M. Morais Da Silva, A C. Gomes, Margarida Casal, Vitor Sencadas Jan 2018

Antibacterial And Antifungal Activity Of Poly(Lactic Acid)-Bovine Lactoferrin Nanofiber Membranes, Raul Machado, André Da Costa, Dina M. Morais Da Silva, A C. Gomes, Margarida Casal, Vitor Sencadas

Faculty of Engineering and Information Sciences - Papers: Part B

Antimicrobial materials have become relevant for local therapies preventing microbial resistance induced by systemic antibiotic treatments. This work reports the development of electrospun poly(lactic acid) (PLLA) nanofiber membranes loaded with bovine lactoferrin (bLF) up to 20 wt%. The membranes present smooth and nondefective fibers with mean diameters between 717 ± 197 and 495 ± 127 nm, and an overall porosity of ≈80%. The hydrophobicity of the PLLA membranes is reduced by the presence of bLF. The release profile of bLF correlates with an anomalous transport model, with 17.7 ± 3.6% being released over 7 weeks. The nanofiber mats show no …

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Stability And Phase Space Analysis Of Fluidized-Dense Phase Pneumatic Transport System, Baldeep Kaur, Anu Mittal, Soumendu Jana, Soumya Suddha Mallick, Peter W. Wypych Jan 2018

Stability And Phase Space Analysis Of Fluidized-Dense Phase Pneumatic Transport System, Baldeep Kaur, Anu Mittal, Soumendu Jana, Soumya Suddha Mallick, Peter W. Wypych

Faculty of Engineering and Information Sciences - Papers: Part B

Fluidized dense-phase pneumatic conveying of powders is gaining popularity in several industries, such as power, chemical, cement, refinery, alumina, pharmaceutical, limestone, because of reduced gas flow rate and power consumption, decreased conveying velocities, improved product quality control, reduced pipeline sizing and wear rate, increased workplace safety etc. However, understanding the fundamental transport mechanism of fluidized dense-phase transport has only made limited progress because of the highly concentrated and turbulent nature of the gas-solids mixture. In the present work, pneumatic conveying trials were conducted with power plant fly ash (median particle diameter: 30 μm; particle density: 2300 kg/m3; …

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A Stabilization Theorem For Fell Bundles Over Groupoids, Marius Ionescu, Alexander Kumjian, Aidan Sims, Dana P. Williams Jan 2018

A Stabilization Theorem For Fell Bundles Over Groupoids, Marius Ionescu, Alexander Kumjian, Aidan Sims, Dana P. Williams

Faculty of Engineering and Information Sciences - Papers: Part B

We study the C * -algebras associated with upper semi-continuous Fell bundles over second-countable Hausdorff groupoids. Based on ideas going back to the Packer-Raeburn 'stabilization trick', we construct from each such bundle a groupoid dynamical system whose associated Fell bundle is equivalent to the original bundle. The upshot is that the full and reduced C * -algebras of any saturated upper semi-continuous Fell bundle are stably isomorphic to the full and reduced crossed products of an associated dynamical system. We apply our results to describe the lattice of ideals of the C * -algebra of a continuous Fell bundle by …

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Model Predictive Control (Mpc) For Enhancing Building And Hvac System Energy Efficiency: Problem Formulation, Applications And Opportunities, Gianluca Serale, Massimo Fiorentini, Alfonso Capozzoli, Daniele Bernardini, Alberto Bemporad Jan 2018

Model Predictive Control (Mpc) For Enhancing Building And Hvac System Energy Efficiency: Problem Formulation, Applications And Opportunities, Gianluca Serale, Massimo Fiorentini, Alfonso Capozzoli, Daniele Bernardini, Alberto Bemporad

Faculty of Engineering and Information Sciences - Papers: Part B

In the last few years, the application of Model Predictive Control (MPC) for energy management in buildings has received significant attention from the research community. MPC is becoming more and more viable because of the increase in computational power of building automation systems and the availability of a significant amount of monitored building data. MPC has found successful implementation in building thermal regulation, fully exploiting the potential of building thermal mass. Moreover, MPC has been positively applied to active energy storage systems, as well as to the optimal management of on-site renewable energy sources. MPC also opens up several opportunities …

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Development Of Magnetorheological Elastomers-Based Tuned Mass Damper For Building Protection From Seismic Events, Shuaishuai Sun, Jian Yang, Haiping Du, Shiwu Zhang, Tianhong Yan, Masami Nakano, Weihua Li Jan 2018

Development Of Magnetorheological Elastomers-Based Tuned Mass Damper For Building Protection From Seismic Events, Shuaishuai Sun, Jian Yang, Haiping Du, Shiwu Zhang, Tianhong Yan, Masami Nakano, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

This study investigated and evaluated a semi-active tuned mass damper which incorporated four multi-layered structures fabricated using magnetorheological elastomers. The four magnetorheological elastomer structures formed a square and provided the tuned mass damper variable stiffness used to track the excitation frequencies. This design not only increases the stability of the tuned mass damper but more importantly eliminates the magnetic circuit gap in a design which we used in the past because all four of the magnetic circuits used to control the magnetorheological elastomer isolators are closed circuits. In order to verify the capability of the magnetorheological elastomer-based tuned mass damper …

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Exploring The Potential Of Big Data On The Health Care Delivery Value Chain (Cdvc): A Preliminary Literature And Research Agenda, William J. Tibben, Samuel Fosso Wamba Jan 2018

Exploring The Potential Of Big Data On The Health Care Delivery Value Chain (Cdvc): A Preliminary Literature And Research Agenda, William J. Tibben, Samuel Fosso Wamba

Faculty of Engineering and Information Sciences - Papers: Part B

Big data analytics (BDA) is emerging as a game changer in healthcare. While the practitioner literature has been speculating on the high potential of BDA in transforming the healthcare sector, few rigorous empirical studies have been conducted by scholars to assess the real potential of BDA. Drawing on the health care delivery value chain (CDVC) and an extensive literature review, this exploratory study aims to discuss current peer-reviewed articles dealing with BDA across the CDVC and discuss future research directions.

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Improving Privacy-Preserving And Security For Decentralized Key-Policy Attributed-Based Encryption, Leyou Zhang, Pengfei Liang, Yi Mu Jan 2018

Improving Privacy-Preserving And Security For Decentralized Key-Policy Attributed-Based Encryption, Leyou Zhang, Pengfei Liang, Yi Mu

Faculty of Engineering and Information Sciences - Papers: Part B

OAPA Decentralized attribute-based encryption(ABE) is an efficient and flexible multi-authority attribute-based encryption system, since it does not requires the central authority and does not need to cooperate among the authorities for creating public parameters. Unfortunately, recent works show that the reality of the privacy-preserving and security in almost well-known decentralized key policy ABE(KP-ABE) schemes are doubtful. How to construct a decentralized KP-ABE with the privacy-preserving and user collusion avoidance is still a challenge problem. Most recently, Y.Rahulamathavam et al. proposed a decentralized key-policy(KP) ABE scheme to try avoiding user collusion and preserving the user & #x2019;s privacy. However, we exploit …

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A System Model For Personalized Medication Management (Mymediman)-The Consumers' Point Of View, Elena Vlahu-Gjorgievska, Khin Than Win, Willy Susilo Jan 2018

A System Model For Personalized Medication Management (Mymediman)-The Consumers' Point Of View, Elena Vlahu-Gjorgievska, Khin Than Win, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, we propose a design for a personalized medication management system model MyMediMan that provides medication information for different stakeholders. The focus of the paper is on the system's features and personalized information provided for the consumers as primary users of the proposed solution. The presented design introduces the consumers to different aspects of the medications they take and their overall health condition. The personalized information should increase the consumers' awareness about the positive benefits of taking the medications as well as the consequences that particular medication can have on their health condition. By obtaining this information, the …

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Cooperative Secret Sharing Using Qr Codes And Symmetric Keys, Yang-Wai Chow, Willy Susilo, Joseph Tonien, Elena Vlahu-Gjorgievska, Guomin Yang Jan 2018

Cooperative Secret Sharing Using Qr Codes And Symmetric Keys, Yang-Wai Chow, Willy Susilo, Joseph Tonien, Elena Vlahu-Gjorgievska, Guomin Yang

Faculty of Engineering and Information Sciences - Papers: Part B

Secret sharing is an information security technique where a dealer divides a secret into a collection of shares and distributes these to members of a group. The secret will only be revealed when a predefined number of group members cooperate to recover the secret. The purpose of this study is to investigate a method of distributing shares by embedding them into cover Quick Response (QR) codes in a secure manner using cryptographic keys. The advantage of this approach is that the shares can be disseminated over public channels, as anyone who scans the QR codes will only obtain public information. …

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Integrated Dynamics Control And Energy Efficiency Optimization For Overactuated Electric Vehicles, Boyuan Li, Haiping Du, Weihua Li, Bangji Zhang Jan 2018

Integrated Dynamics Control And Energy Efficiency Optimization For Overactuated Electric Vehicles, Boyuan Li, Haiping Du, Weihua Li, Bangji Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

A large number of studies have been conducted on the dynamics control of electric vehicles or on the optimization of their energy efficiency but few studies have looked at both of these together. In this study, an integrated dynamics control and energy efficiency optimization strategy is proposed for overactuated electric vehicles, where the control of both longitudinal and lateral dynamics is dealt with while the energy efficiency is optimized. First, considering the trade-off between control performance and energy efficiency, criteria are defined to categorize the vehicle motion status as linear pure longitudinal motion and non-linear motion or turning motion. Then …

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Effects Of Orthopedic Insoles On Static Balance Of Older Adults Wearing Thick Socks, Christina Ma, Duo Wong, Anson Wan, Winson Lee Jan 2018

Effects Of Orthopedic Insoles On Static Balance Of Older Adults Wearing Thick Socks, Christina Ma, Duo Wong, Anson Wan, Winson Lee

Faculty of Engineering and Information Sciences - Papers: Part B

Background: The wearing of socks and insoles may affect the ability of the foot to detect tactile input influencing postural balance. Objectives: The aim of this study was to investigate whether (1) thick socks adversely affected the elderly postural balance and (2) orthopedic insoles could improve the elderly postural balance while wearing thick socks. Study design: Repeated-measures study design. Methods: In total, 14 healthy older adults were recruited. A monofilament test was conducted to evaluate foot plantar sensation with and without thick socks. Subjects then performed the Romberg tests under three conditions: (1) barefoot, (2) with socks only, and (3) …

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Tunable Particle Separation In A Hybrid Dielectrophoresis (Dep)- Inertial Microfluidic Device, Jun Zhang, Dan Yuan, Qianbin Zhao, Sheng Yan, Shiyang Tang, Say H. Tan, Jinhong Guo, Huanming Xia, Nam-Trung Nguyen, Weihua Li Jan 2018

Tunable Particle Separation In A Hybrid Dielectrophoresis (Dep)- Inertial Microfluidic Device, Jun Zhang, Dan Yuan, Qianbin Zhao, Sheng Yan, Shiyang Tang, Say H. Tan, Jinhong Guo, Huanming Xia, Nam-Trung Nguyen, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

Particle separation is indispensable in many microfluidic systems and holds a broad range of biomedical applications. Inertial microfluidic devices that work solely on intrinsic hydrodynamic forces and inertial effects can offer label-free, high throughput and high efficiency separation performance. However, the working range of the current inertial microfluidic systems is obtained by tailoring the inertial lift forces and secondary flow drag through flow speed. Each channel design is normally effective for specific target particles, which inevitably lacks the flexibility for various particle mixtures. Redesigning the structure and dimension of microchannels for new sets of particle mixtures is often time-consuming and …

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Weak Defect Identification For Centrifugal Compressor Blade Crack Based On Pressure Sensors And Genetic Algorithm, Hongkun Li, Changbo He, Reza Malekian, Zhixiong Li Jan 2018

Weak Defect Identification For Centrifugal Compressor Blade Crack Based On Pressure Sensors And Genetic Algorithm, Hongkun Li, Changbo He, Reza Malekian, Zhixiong Li

Faculty of Engineering and Information Sciences - Papers: Part B

The Centrifugal compressor is a piece of key equipment for petrochemical factories. As the core component of a compressor, the blades suffer periodic vibration and flow induced excitation mechanism, which will lead to the occurrence of crack defect. Moreover, the induced blade defect usually has a serious impact on the normal operation of compressors and the safety of operators. Therefore, an effective blade crack identification method is particularly important for the reliable operation of compressors. Conventional non-destructive testing and evaluation (NDT & E) methods can detect the blade defect effectively, however, the compressors should shut down during the testing process …

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Measurement Accuracy Of Fbg Used As A Surface-Bonded Strain Sensor Installed By Adhesive, Guangzhe Xue, Xinqiu Fang, Xiukun Hu, Libin Gong Jan 2018

Measurement Accuracy Of Fbg Used As A Surface-Bonded Strain Sensor Installed By Adhesive, Guangzhe Xue, Xinqiu Fang, Xiukun Hu, Libin Gong

Faculty of Engineering and Information Sciences - Papers: Part B

Material and dimensional properties of surface-bonded fiber Bragg gratings (FBGs) can distort strain measurement, thereby lowering the measurement accuracy. To accurately assess measurement precision and correct obtained strain, a new model, considering reinforcement effects on adhesive and measured object, is proposed in this study, which is verified to be accurate enough by the numerical method. Meanwhile, a theoretical strain correction factor is obtained, which is demonstrated to be significantly sensitive to recoating material and bonding length, as suggested by numerical and experimental results. It is also concluded that a short grating length as well as a thin but large-area (preferably …

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