Engineering Commons^™

Factors Affecting Energy Efficiency Investments - A Case Study Of Bhutan, Roshan Chhetri, Young-Ho Lee, Duane A. Robinson, Sumitra Pokhrel

Faculty of Engineering and Information Sciences - Papers: Part B

Energy efficiency is providing the same services consuming less energy. Less energy means less energy bill and less greenhouse emissions. Bhutan presents a unique scenario in promoting the use of energy efficiency equipment and investments. Bhutan enjoys availability of adequate low cost hydropower energy resource that is green and clean and enjoys cheap electrical energy. To aggravate the situation, the domestic tariffs are subsidized and even free up to 100 units in rural parts of the country. Export tariffs are determined independently according to entirely different principles. However for cooking, Bhutan imports LPG (Liquefied Petroleum Gas) from India. With increasing …

A Derivative-Free Vu-Algorithm For Convex Finite-Max Problems, Warren L. Hare, Chayne Planiden, Claudia Sagastizabal

Faculty of Engineering and Information Sciences - Papers: Part B

The VU-algorithm is a superlinearly convergent method for minimizing nonsmooth, convex functions. At each iteration, the algorithm works with a certain V-space and its orthogonal u-space, such that the nonsmoothness of the objective function is concentrated on its projection onto the V-space, and on the U-space the projection is smooth. This structure allows for an alternation between a Newton-like step where the function is smooth, and a proximal-point step that is used to find iterates with promising VU-decompositions. We establish a derivative-free variant of the VU-algorithm for convex finite-max objective functions. We show global …

Thermionic Enhanced Heat Transfer In Electronic Devices Based On 3d Dirac Materials, Sunchao Huang, R A. Lewis, C Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

We calculate the heat transfer from electronic devices based on three-dimensional Dirac materials without and with thermionic cooling. Without thermionic cooling, the internal temperature of the devices is at best equal to and usually higher than the temperature of the surrounding environment. However, when thermionic cooling is employed to transport heat, the internal temperature can be considerably lower than the environmental temperature. In the proposed thermionic cooling process, the energy efficiency can be as high as 75% of the Carnot efficiency.

Two-Dimensional Solid-State Array Detectors: A Technique For In Vivo Dose Verification In A Variable Effective Area, Kananan Utitsarn, Giordano Biasi, Nauljun Stansook, Z A. Alrowaili, Marco Petasecca, Martin G. Carolan, Vladimir Perevertaylo, Wolfgang Tome, Tomas Kron, Michael L. F Lerch, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

Purpose:We introduce a technique that employs a 2D detector in transmission mode (TM) to verify dose maps at a depth of dmaxin Solid Water. TM measurements, when taken at a different surface‐to‐detector distance (SDD), allow for the area at dmax(in which the dose map is calculated) to be adjusted.Methods:We considered the detector prototype"MP512"(an array of 512 diode‐sensitive volumes, 2 mm spatial resolution). Measurements in transmission mode were taken at SDDs in the range from 0.3 to 24 cm. Dose mode (DM) measurements were made at dmaxin Solid Water. We considered radiation fields in the range from 2x2cm2to 10x10 cm2, produced …

A Semianalytical Formula For European Options Under A Hybrid Heston-Cox-Ingersoll-Ross Model With Regime Switching, Xinjiang He, Wenting Chen

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, we consider the pricing of European options under a regime-switching Heston-Cox-Ingersoll-Ross (CIR) hybrid model, where the mean-reversion levels of both the stochastic volatility and interest rate are assumed to change among different states. Albeit difficult, we have still managed to derive an semianalytical pricing formula for European options after the generalized moment generating function of this particular model is worked out. Numerical experiments are also carried out to demonstrate the accuracy of the newly derived formula as well as the influence of the introduction of the regime-switching mechanics on option prices. Finally, through a preliminary empirical study, …

3d Printable Vacuum-Powered Soft Linear Actuators, Charbel Tawk, Geoffrey M. Spinks, Marc In Het Panhuis, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

Soft robots which are made of highly deformable materials are ideal to operate in unstructured environments and to interact safely with humans. This work presents directly 3D printed linear soft vacuum actuators (LSOVA), that are manufactured in a single step without requiring any post-processing and support material, using a low-cost and open-source fused deposition modeling 3D printer. LSOVA have multiple advantages such as high bandwidths (~6.49Hz), high output forces (~27N) and long lifetimes (~21,500 cycles). Finite element models and analytical models are developed to accurately predict the performance of LSOVA in terms of blocked force and linear stroke. The LSOVAs …

An Analysis Of Organic Carbon Removal In A Two-Reactor Cascade With Recycle And A Two-Reactor Step-Feed Cascade With Recycle, Mark Nelson, Bronwyn Bradshaw-Hajek

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Curtin University and John Wiley & Sons, Ltd. We analyse the steady-state operation of two process configurations that employ a reactor cascade with recycle. The first process configuration is a two-reactor cascade in which the feed stream enters into the first reactor. The second process configuration is a two-reactor step-feed cascade in which the feed stream enters the second reactor. In each process configuration, part of the effluent stream is recycled back into the first reactor. The reactors in the cascade need not be of equal volume. The reaction is assumed to be a biological process governed by Monod …

Zinc Removal From Basic Oxygen Steelmaking (Bos) Filter Cake By Sintering, Huibin Li, David J. Pinson, Paul Zulli, Liming Lu, Raymond Longbottom, Sheng J. Chew, Brian J. Monaghan, Guangqing Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Zinc removal from basic oxygen steelmaking filter cake was studied by tablet testing and in a millipot under different conditions. The results from tablet testing show that coke and metallic iron in filter cake play the role of reductants to remove zinc during sintering. Zinc removal increased with increasing temperature and decreasing partial pressure of oxygen. Zinc removal reached 24.6% when a tablet of filter cake without addition of coke was sintered at 1300 °C in a nitrogen atmosphere. Addition of 3 to 9 wt% of coke breeze into filter cake enhanced the zinc removal to 60.6 to 91.4%, …

3-E Analysis And Optimization Of An Organic Rankine Flash Cycle Integrated With A Pem Fuel Cell And Geothermal Energy, Zhixiong Li, Shoaib Khanmohammadi, Saber Khanmohammadi, Abdullah Al-Rashed, Pouria Ahmadi, Masoud Afrand

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Hydrogen Energy Publications LLC The current research deals with thermodynamic and economic analyses and optimization of a geothermal system integrated with organic Rankine flash cycle (ORFC) and a polymer electrolyte membrane fuel cell (PEM-FC). A thermodynamic model for ORFC and PEM-FC is developed to investigate employing the PEM-FC in a combined geothermal ORFC. A comparative study is carried out to determine the effect of applying PEM-FC in a geothermal based ORFC. The validation of PEM-FC simulation with experimental data from the literature shows a good agreement. The results of numerical modeling indicate that using the rejected heat in the …

From Regional To Global Brain: A Novel Hierarchical Spatial-Temporal Neural Network Model For Eeg Emotion Recognition, Yang Li, Wenming Zheng, Lei Wang, Yuan Zong, Zhen Cui

Faculty of Engineering and Information Sciences - Papers: Part B

IEEE In this paper, we propose a novel Electroencephalograph (EEG) emotion recognition method inspired by neuroscience with respect to the brain response to different emotions. The proposed method, denoted by R2G-STNN, consists of spatial and temporal neural network models with regional to global hierarchical feature learning process to learn discriminative spatial-temporal EEG features. To learn the spatial features, a bidirectional long short term memory (BiLSTM) network is adopted to capture the intrinsic spatial relationships of EEG electrodes within brain region and between brain regions, respectively. Considering that different brain regions play different roles in the EEG emotion recognition, a region-attention …

Enhancing Goldreich, Goldwasser And Halevi's Scheme With Intersecting Lattices, Arnaud Sipasseuth, Thomas Plantard, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part B

We present a technique to enhance the security of the Goldreich, Goldwasser and Halevi (GGH) scheme. The security of GGH has practically been broken by lattice reduction techniques. Those attacks are successful due to the structure of the basis used in the secret key. In this work, we aim to present a new technique to alleviate this problem by modifying the public key which hides the structure of the corresponding private key. We intersect the initial lattice with a random one while keeping the initial lattice as our secret key and use the corresponding result of the intersection as the …

Characterization Of The Mixed Radiation Field Produced By Carbon And Oxygen Ion Beams Of Therapeutic Energy: A Monte Carlo Simulation Study, C Ying, David Bolst, Anatoly B. Rosenfeld, Susanna Guatelli

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Wolters Kluwer Medknow Publications. All rights reserved. Purpose: The main advantages of charged particle radiotherapy compared to conventional X-ray external beam radiotherapy are a better tumor conformality coupled with the capability of treating deep-seated radio-resistant tumors. This work investigates the possibility to use oxygen beams for hadron therapy, as an alternative to carbon ions. Materials and Methods: Oxygen ions have the advantage of a higher relative biological effectiveness (RBE) and better conformality to the tumor target. This work describes the mixed radiation field produced by an oxygen beam in water and compares it to the one produced by a …

Through-The-Wall Target Separation Using Low-Rank And Variational Mode Decomposition, Fok Hing Chi Tivive, Abdesselam Bouzerdoum

Faculty of Engineering and Information Sciences - Papers: Part B

1980-2012 IEEE. Through-the-wall radar imaging (TWRI) is a sensing technology that can be used for detecting, locating, and identifying targets inside enclosed building structures. Many of the existing target classification approaches focus on single-target scene. For multi-target classification, the radar signal has to be segregated into different target components. However, target separation in TWRI is a challenging problem since the radar signals consist of both strong wall reflections and weak target echoes. Furthermore, the target signals are attenuated and distorted when propagating through the wall. In this paper, a variational model with low-rank constraint is proposed for decomposing the radar …

Carbon Nanotube And Graphene Fiber Artificial Muscles, Javad Foroughi, Geoffrey M. Spinks

Faculty of Engineering and Information Sciences - Papers: Part B

2019 The Royal Society of Chemistry. Actuator materials capable of producing a rotational or tensile motion are rare and, yet, rotary systems are extensively utilized in mechanical systems like electric motors, pumps, turbines and compressors. Rotating elements of such machines can be rather complex and, therefore, difficult to miniaturize. Rotating action at the microscale, or even nanoscale, would benefit from the direct generation of torsion from an actuator material. Herein we discuss the advantages of using carbon nanotube (CNT) yarns and/or graphene (G) fibers as novel artificial muscles that have the ability to be driven by the electrochemical charging of …

Analog Least Mean Square Loop For Self-Interference Cancellation In In-Band Full-Duplex Systems, Anh Tuyen Le, Le Chung Tran, Xiaojing Huang, Y. Jay Guo

Faculty of Engineering and Information Sciences - Papers: Part B

Analog Least Mean Square (ALMS) loop is a promising method to cancel self-interference (SI) in in-band full-duplex (IBFD) systems. In this talk, the steady state analyses of the residual SI powers in both analog and digital domains are derived in frequency domain. It is proved that the ALMS loop amplifies the frequency components of the residual SI at the edges of the signal spectrum in the analog domain, but the matched filter in the receiver chain reduces this effect. This results in a significant improvement of the interference suppression ratio in the digital domain before information data detection. The lower …

Mhealth Medical Record To Contribute To Noncommunicable Diseases In Indonesia, Dedi Iskandar Inan, Khin Than Win, Ratna Juita

Faculty of Engineering and Information Sciences - Papers: Part B

2019 The Authors. NonCommunicable Diseases (NCDs) have been the public concern worldwide, both in developed and developing countries. The issues are not only about the number of mortality but also the economic implications caused by the diseases. This paper aims to exploit the mobile technology potential by developing an mHealth medical record to assist the prevention and controlling of diseases in Indonesia, particularly in the West Papua Province. Design Science Research (DSR) methodology in Information System (IS) is employed to guide these research activities. This solution enables the medical data to be deposited by a person directly and personally utilising …

Experimental Testing And Modelling Of A Rotary Variable Stiffness And Damping Shock Absorber Using Magnetorheological Technology, Lei Deng, Shuaishuai Sun, Matthew Christie, Jian Yang, Donghong Ning, Xiaojing Zhu, Haiping Du, Shiwu Zhang, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

This article presents a novel rotary shock absorber which combines the abilities of variable stiffness and variable damping by assembling a set of two magnetorheological damping units, one of which being placed in series with a rubber spring. This allows the damping and stiffness to be controlled independently by the internal damping and the external damping units, respectively. A test bench was established to verify the variable stiffness and damping functionality. The experimental results for variable damping test, variable stiffness test and co-working test are presented. At the amplitude of 10° and the frequency 0.5 Hz, increases of 141.6% and …

Efficient Attribute-Based Encryption With Privacy-Preserving Key Generation And Its Application In Industrial Cloud, Yujiao Song, Hao Wang, Xiaochao Wei, Lei Wu

Faculty of Engineering and Information Sciences - Papers: Part B

Due to the rapid development of new technologies such as cloud computing, Internet of Things (IoT), and mobile Internet, the data volumes are exploding. Particularly, in the industrial field, a large amount of data is generated every day. How to manage and use industrial Big Data primely is a thorny challenge for every industrial enterprise manager. As an emerging form of service, cloud computing technology provides a good solution. It receives more and more attention and support due to its flexible configuration, on-demand purchase, and easy maintenance. Using cloud technology, enterprises get rid of the heavy data management work and …

The Vulnerability Of Multiplicative Noise Protection To Correlation-Attacks On Continuous Microdata, Yue Ma, Yan-Xia Lin, Rathin Sarathy

Faculty of Engineering and Information Sciences - Papers: Part B

When multiplicative noises are used to protect values of a sensitive attribute in a microdata, it is frequently assumed that data intruders use the noise-multiplied value to estimate the corresponding unobservable original value of a target record. In this paper, we show that, data intruders could easily construct another estimate instead of using the noise-multiplied value to attack an original value. The new estimate, namely "correlation-attack" estimate, is obtained by exploiting the potentially high correlation between the noise-multiplied data and the original data. We provide a detailed comparison between the two estimates (noise-multiplied value and the correlation-attack estimate) by comparing …

A Case Study On Pricing Foreign Exchange Options Using The Modified Craig-Sneyd Adi Scheme, Chittaranjan Mishra, Xiaoping Lu

Faculty of Engineering and Information Sciences - Papers: Part B

One of the prominent alternating direction implicit (ADI) schemes for numerically pricing financial options, the modified Craig-Sneyd scheme, is put to test for its reliability and efficiency for solving non-trivial problems with empirical market data. The Heston equation for pricing foreign exchange options of European style, a two-dimensional convection-diffusion-reaction equation with a mixed derivative term, is numerically solved for various parameter values observed in the market by employing the said scheme. Numerical stability and convergence issues of this scheme is compared with another popular Hundsdorfer-Verwer ADI scheme. From among a total of 56 options on 8 currency pairs, it is …

Whitmore Tension Section And Block Shear, Matthew Elliott, Lip H. Teh

Faculty of Engineering and Information Sciences - Papers: Part B

This paper examines the validity of the Whitmore net section tension capacity for the design of bolted gusset plates. Using simple algebra, this paper first shows that the Whitmore criterion and the correct block shear criterion would give similar results for a standard connection having approximately seven rows of bolts. It then shows that the Whitmore criterion severely underestimates the actual capacities of connections having two or three bolt rows tested by independent researchers. Conversely, it also shows that the same criterion overestimates the capacities of connections having nine bolt rows that were believed by the testing researchers to fail …

Comparison Of The Mineralogy Of Iron Ore Sinters Using A Range Of Techniques, Tom Honeyands, James Manuel, Leanne Matthews, Damien O'Dea, David J. Pinson, J Leedham, Guangqing Zhang, Huibin Li, Brian J. Monaghan, Xinliang Liu, Eugene Donskoi, Nathan A.S. Webster, Mark Pownceby

Faculty of Engineering and Information Sciences - Papers: Part B

Many different approaches have been used in the past to characterise iron ore sinter mineralogy to predict sinter quality and elucidate the impacts of iron ore characteristics and process variables on the mechanisms of sintering. This paper compares the mineralogy of three sinter samples with binary basicities (mass ratio of CaO/SiO₂) between 1.7 and 2.0. The measurement techniques used were optical image analysis and point counting (PC), quantitative X‐ray diffraction (QXRD) and two different scanning electron microscopy systems, namely, Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN) and TESCAN Integrated Mineral Analyser (TIMA). Each technique has its …

Oxidation Behaviour Of Steel During Hot Rolling By Using Tio2-Containing Water-Based Nanolubricant, Hui Wu, Chengyang Jiang, Jianqiang Zhang, Shuiquan Huang, Lianzhou Wang, Sihai Jiao, Han Huang, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

The formation and performance of oxide scale on a low-alloy steel were investigated during hot rolling at 850 and 950 °C under various lubrication conditions, including benchmarks (dry condition and water) and water-based nanolubricants containing various concentrations of nano-TiO2 from 1.0 to 8.0 wt%. The results showed that the addition of nano-TiO2 particles in the lubricant significantly reduced the thickness of oxide scale and surface oxide roughness. The reduction reached the maximum when the concentration of TiO2 was 4.0 wt%. Detailed oxide phase characterisation and oxide component fraction determination revealed that hot rolling destroyed the conventional multi-layer oxide scale and …

Dimensionality Reduction And Visualization Of Network Intrusion Detection Data, Wei Zong, Yang-Wai Chow, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part B

Nowadays, network intrusion detection is researched extensively due to increasing global network threats. Many researchers propose to incorporate machine learning techniques in network intrusion detection systems since these techniques allow for automated intrusion detection with high accuracy. Furthermore, dimensionality reduction techniques can improve the performance of machine learning models, and as such, are widely used as a pre-processing step. Nevertheless, many researchers consider machine learning techniques as a black box because of its complex intrinsic mechanism. Visualization plays an important role in facilitating the understanding of such sophisticated techniques because visualization is able to offer intuitive meaning to the machine …

Prediction Of Blast Furnace Hearth Condition: Part I - A Steady State Simulation Of Hearth Condition During Normal Operation, Xue Feng Dong, Paul Zulli

Faculty of Engineering and Information Sciences - Papers: Part B

A coupled flow and refractory model (CFRM) has been upgraded to assist engineers in understanding and interpreting the measured refractory temperature distributions in the hearth of a blast furnace hearth. CFRM describes the liquid flow distribution and heat transfer in the hearth, allowing various scenarios to be simulated involving coke bed properties, extent of hearth refractory wear, etc. The model was validated through comparison between measured refractory data and corresponding model predictions for the early stages of the current BlueScope's No. 5 Blast Furnace campaign. For the current campaign, the actual range in measured pad temperature fluctuation over a short …

Alternative Pricing Methods For Shout Call Options, Joanna M. Goard

Faculty of Engineering and Information Sciences - Papers: Part B

Shout call options are exotic options that give the investor the ability to 'shout' during the life of the option, thus locking in a profit and resetting the strike price to the prevailing spot price. We look at two approaches to value such options. The first approach makes use of canonical variables of the classical heat equation and results in a series solution. In the second approach an integral formulation is used, which can be more amenable to pricing when there is more than one 'shout' allowed.

A 7r Spatial Linkage For Ankle Rehabilitation With An Arbitrary Ankle Rotation Axis, Chih-Ching Hsieh, Chin-Hsing Kuo, Daisuke Matsuura, Yukio Takeda

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, a 7R spatial linkage for ankle rehabilitation was proposed. Thanks to its kinematic geometry, the output joint, which is accommodated by the patient's ankle, of the linkage can possess an arbitrary joint axis at any configuration. This advantage allows the patient achieving a flexible ankle motion in 3-D space while performing the rehabilitation exercise. The design concept of the 7R linkage is explained, and the displacement and force relationships between the input and output joints (i.e., the motor and patient's ankle) are analyzed through an equivalent RSSR linkage. A prototype is built to validate the proposed design …

Coupled Cfd-Dem Modelling Of Mine Dust Dispersion In Underground Roadway, Lihai Tan, Ting X. Ren

Faculty of Engineering and Information Sciences - Papers: Part B

Dust particles floating inside roadways are characterized by various sizes. However, it is difficult to replicate the dust environment with such factors taken into consideration in laboratory experiments. Fortunately, computational technology provides an alternative way for that. In this study, in order to investigate the movement mechanism of dust with different diameters from heading face in the underground roadway, a three-dimensional CFD-DEM coupling numerical model is presented using the Eulerian-Lagrangian method. A numerical roadway model based on a practical engineering case has been established for the purpose of studying the dust diffusion under single-forced ventilation condition in roadway underground. The …

Experimental And Numerical Studies Of Square Concrete-Filled Double Steel Tubular Short Columns Under Eccentric Loading, Mizen Ahmed, Qing Quan Liang, Vipulkumar I. Patel, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

Square concrete-filled double steel tubular (CFDST) beam-columns consisting of an internal circular steel tube have increasingly been utilized in composite building structures because of their high structural performance. This paper describes experimental and numerical studies on the structural responses of square thin-walled CFDST columns loaded eccentrically. Tests on twenty short square CFDST columns were undertaken that included sixteen columns under eccentric loading and four columns under concentric loading. The parameters examined in the experiments included the cross-sectional dimensions, the width-to-thickness ratios of outer and internal tubes and loading eccentricity. The measured ultimate strengths, load-shortening responses, load-lateral displacement curves, stress-strain curves …

A Survey On What Australians With Upper Limb Difference Want In A Prosthesis: Justification For Using Soft Robotics And Additive Manufacturing For Customized Prosthetic Hands, Benjamin Stephens-Fripp, Mary Jean Walker, Eliza Goddard, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

Purpose: Upper limb prostheses are part of a rapidly changing market place. Despite development in device design, surveys report low levels of uptake and dissatisfaction with current prosthetic design. In this study, we present the results of a survey conducted with people with upper limb difference in Australia on their use of current prostheses and preferences in a prosthetic in order to inform future prosthetic hand design.

Methods: An online survey was conducted on upper limb amputees, with 27 respondents that completed the survey. The survey was a mixture of open-ended questions, ranking design features and quantitative questions …