Social and Behavioral Sciences Commons^™

Behaviour Of Gfrp Tube Reinforced Concrete Columns Under Eccentric Loading, Weiqiang Wang, Ali Q. Al-Baali, M Neaz Sheikh, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part A

This study investigated the behaviour of glass fibre reinforced polymer (GFRP) tube reinforced concrete columns under eccentric loading. A total of four reinforced concrete columns with 240 mm in diameter and 800 mm in height were cast and tested under concentric or eccentric loading conditions. The first column was the reference column which was reinforced with steel helix and longitudinal steel bars, and the other three identical columns were reinforced with GFRP tubes. The cover thickness was 28 mm on the sides and 20 mm at the top and bottom ends. All the columns were made from normal strength concrete …

Nitrogen Injection To Flush Coal Seam Gas Out Of Coal: An Experimental Study, Lei Zhang, Naj Aziz, Ting Ren, Jan Nemcik, Shihao Tu

Faculty of Engineering and Information Sciences - Papers: Part A

Several mines operating in the Bulli seam of the Sydney Basin in NSW, Australia are experiencing difficulties in reducing gas content within the available drainage lead time in various sections of the coal deposit. Increased density of drainage boreholes has proven to be ineffective, particularly in sections of the coal seam rich in CO2. Plus with the increasing worldwide concern on green house gas reduction and clean energy utilisation, significant attention is paid to develop a more practical and economical method of enhancing the gas recovery from coal seams. A technology based on N2 injection was proposed to flush the …

Laboratory Determination Of Coefficient Of Consolidation From Pore Water Pressure Measurement, J S. Vinod, A Sridharan

Faculty of Engineering and Information Sciences - Papers: Part A

ICE Publishing: all rights reserved. In the recent past, many studies have been carried out on the determination of coefficient of consolidation (cv) from the time (t)-deformation (d) data obtained from conventional consolidation tests. Several researchers have also proposed different curve fitting procedures for determining cv from the t-d data. It is anticipated that the cv values obtained from the t-d data may be influenced by initial and secondary compressions. Nevertheless, the pore water pressure data measured during the consolidation process will be independent of initial and secondary compressions. In this study, the conventional Asaoka (1978) method is extended to …

Supervised Machine Learning Model For High Dimensional Gene Data In Colon Cancer Detection, Huaming Chen, Hong Zhao, Jun Shen, Rui Zhou, Qingguo Zhou

Faculty of Engineering and Information Sciences - Papers: Part A

With well-developed methods in gene level data extraction, there are huge amount of gene expression data, including normal composition and abnormal ones. Therefore, mining gene expression data is currently an urgent research question, for detecting a corresponding pattern, such as cancer species, quickly and accurately. Since gene expression data classification problem has been widely studied accompanying with the development of gene technology, by far numerous methods, mainly neural network related, have been deployed in medical data analysis, which is mainly dealing with the high dimension and small quantity. A lot of research has been conducted on clustering approaches, extreme learning …

Goal-Driven Context-Aware Data Filtering In Iot-Based Systems, Nanjangud C. Narendra, Karthikeyan Ponnalagu, Srikanth Tamilselvam, Aditya Ghose

Faculty of Engineering and Information Sciences - Papers: Part A

One of the crucial research issues in an IoT-based system is how to manage the huge amount of data transmitted by the potentially large number of sensors that form the system. Prior research has focused on centralized cloud-based 'Big Data' architectures for collecting, collating and analyzing the data. However, most of these scenarios accumulate thousands of petabytes in a short period of time, increasing the demand for more storage, and also slowing down speed of data analysis. Hence for real-time scenarios, e.g., agricultural crop tracking, traffic management, etc., such an approach would be impractical. Moreover, depending on the context in …

Efficient Modular Exponentiation Based On Multiple Multiplications By A Common Operand, Christophe Negre, Thomas Plantard, Jean-Marc Robert

Faculty of Engineering and Information Sciences - Papers: Part A

The main operation in RSA encryption/decryption is the modular exponentiation, which involves a long sequence of modular squarings and multiplications. In this paper, we propose to improve modular multiplications AB, AC which have a common operand. To reach this goal we modify the Montgomery modular multiplication in order to share common computations in AB and AC. We extend this idea to reduce the cost of multiple modular multiplications AB1,...,ABl by the same operand A. We then take advantage of these improvements in the Montgomery-ladder and SPA resistant m-ary exponentiation algorithms. The complexity analysis shows that for an RSA modulus of …

The Imperative Of Government Transparency In Crisis Communication: The Case Of Airasia Qz8501 Crash, Uuf Brajawidagda, Akemi Takeoka Chatfield, Christopher G. Reddick

Faculty of Engineering and Information Sciences - Papers: Part A

This paper examines the role of government transparency in crisis communication in influencing national and/or international public opinions during an enfolding aviation disaster. Using case study research on the 2014 AirAsia QZ8501 crash, we addressed the research question: How does government transparency in crisis communication influence national public opinions? We examined 1,896 newspaper articles from December 28, 2014 to January 14, 2015. Of these articles, we specifically conducted content analysis on 328 articles published during December 28-30, 2014 that cited government organization as their information source. From our content analysis several key themes surfaced to shed some light on the …

Secure Delegation Of Signing Power From Factorization, Yong Yu, Man Ho Au, Yi Mu, Willy Susilo, Huai Wu

Faculty of Engineering and Information Sciences - Papers: Part A

Delegation of signing is a working way common in oce automation work, and is also an important approach to establish trust. Proxy signature is an important cryptographic primitive for delegating the signing powers and it has found many real world applications. The existing proxy signature schemes from factorization assumption are either insecure or inecient. In this paper, we propose a novel, ecient and provably secure proxy signature scheme from factorization. Our construction makes use of a factorization based key-exposure free chameleon hash function in the delegation phase and the proxy signer needs only to nd a collision to a chameleon …

Logarithmic Size Ring Signatures Without Random Oracles, Clementine Gritti, Willy Susilo, Thomas Plantard

Faculty of Engineering and Information Sciences - Papers: Part A

Ring signatures enable a user to anonymously sign a message on behalf of group of users. In this paper, we propose the first ring signature scheme whose size is O(log2N), where N is the number of users in the ring. We achieve this result by improving Chandran et al.’s ring signature scheme presented at ICALP 2007. Our scheme uses a common reference string and non-interactive zero-knowledge proofs. The security of our scheme is proven without requiring random oracles.

Understanding Risk Communication Gaps Through E-Government Website And Twitter Hashtag Content Analyses: The Case Of Indonesia's Mt. Sinabung Eruption, Akemi Takeoka Chatfield, Christopher G. Reddick

Faculty of Engineering and Information Sciences - Papers: Part A

Despite operational volcano surveillance using meteorological satellite, thermal remote sensing and infrared camera technologies, predicting a volcano's hazardous activity and explosive eruption, with any accuracy, remains nearly impossible. Volcanic hazards and risk literature identifies risk communication as critical but insufficiently understood. This paper, therefore, investigates disaster risk communications during Indonesia's Mt. Sinabung eruptions in February 2014, causing 16 deaths and continuous evacuations of 30,000 residents. We critically examined one-way government-to-citizens communications via e-government websites and Twitter and citizens' multi-directional communications via #sinabung hashtag for sharing volcano risk perceptions about affected villagers. Our Twitter analysis of #sinabung found evidence for the …

Improved Identity-Based Online/Offline Encryption, Jianchang Lai, Yi Mu, Fuchun Guo, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part A

The notion of online/offline encryption was put forth by Guo, Mu and Chen (FC 2008), where they proposed an identity-based scheme called identity-based online/offline encryption (IBOOE). An online/ offline encryption separates an encryption into two stages: offline and online. The offline phase carries much more computational load than the online phase, where the offline phase does not require the information of the message to be encrypted and the identity of the receiver. Subsequently, many applications of IBOOE have been proposed in the literature. As an example, Hobenberger and Waters (PKC 2014) have recently applied it to attribute-based encryption. In this …

An Agent-Mediated Platform For Business Processes, Hoa Khanh Dam, Aditya Ghose, Mohammad Qasim

Faculty of Engineering and Information Sciences - Papers: Part A

Business processes have been widely becoming crucial assets of organisations across various industries and domains. The flexibility in dealing with changes when business processes are executed has significant impact on the success of an organisation's business operations, especially in the current ever-changing business environment. In this context, agent-based systems offer a promisingly powerful platform for business process execution. In this paper, the authors propose an agent-mediated platform for business processes with the aim to contribute to bridge the gap between business process management and agent-oriented development. They present a conceptual mapping method for a seamless transition from business process models …

Novel Experimental Setup For Time-Of-Flight Mass Spectrometry Ion Detection In Collisions Of Anionic Species With Neutral Gas-Phase Molecular Targets, J C. Oller, L Ellis-Gibbings, F Ferreira Da Silva, Paulo Limao-Vieira, Gustavo Garcia

Faculty of Engineering and Information Sciences - Papers: Part A

We report a novel experimental setup for studying collision induced products resulting from the interaction of anionic beams with a neutral gas-phase molecular target. The precursor projectile was admitted into vacuum through a commercial pulsed valve, with the anionic beam produced in a hollow cathode discharge-induced plasma, and guided to the interaction region by a set of deflecting plates where it was made to interact with the target beam. Depending on the collision energy regime, negative and positive species can be formed in the collision region and ions were time-of-flight (TOF) mass-analysed. Here, we present data on O-2 precursor projectile, …

Research On Self-Centering Ability Of Tapered Roll For Initial Flatness Waves Of Steel Strip In The Continuous Annealing Furnace, Kezhi Linghu, Zhengyi Jiang, Wei Tang, Meng Yu, Fengqin Wang, Xueqi Huang

Faculty of Engineering and Information Sciences - Papers: Part A

The snaking of strip in the continuous annealing furnace affects both the process stability of production line significantly and the quality of final products. This paper for the first time proposed the self-centering ability of tapered hearth roll on initial flatness of strip travelling in the furnace and a FEM model that coupling the strip and furnace roll is constructed to simulate the traveling process of strip in the furnace. The self-centering ability is quite different with respect to the different initial flatness waves of strip traveling in the furnace and can be used for optimization of initial flatness of …

Influence Of The Vibration Of Large-Scale Wind Turbine Blade On The Aerodynamic Load, Xiong Liu, Cheng Lu, Shi Liang, Ajit R. Godbole, Yan Chen

Faculty of Engineering and Information Sciences - Papers: Part A

The blades of a large wind turbine are subjected to significant vibrations during operation. The vibrations will impact the dynamic flow field around the blade and consequently alter the aerodynamic forces. In order to better understand the influence of blade vibrations on the aerodynamic loads, the dynamic stall characteristics of an S809 airfoil undergoing various types of motion were investigated using Computational Fluid Dynamics (CFD) techniques. Simulation results indicated that the in-plane and out-of-plane translational motions of the airfoil affect the aerodynamic forces significantly. Furthermore, the influence of vibrations on the aerodynamic loading on the blade of a 5 MW …

Qualitative Analysis Of The Use Of Building Performance Simulation In The Australian Retrofitting Industry, Daniel J. Daly, Paul Cooper, Zhenjun Ma

Faculty of Engineering and Information Sciences - Papers: Part A

Building Performance Simulation (BPS) is a key tool in the existing building enerfy retrofit optimizaiton process, allowing a user to predict energy savings from upgrades. However, little research exists into how BPS is being employed in commercial settings. This paper reports on a qualitative study which examined the use of BPS in the Australian commercial building retrofitting industry.

A New Mixing Technique For Solidifier And Dredged Fill In Coastal Area, Wenhui Shi, Qingsheng Chen, Sanjay Nimbalkar, Wenbai Liu

Faculty of Engineering and Information Sciences - Papers: Part A

One of the major drawbacks of the conventional method of land reclamation, which involves mixing cement with the dredged soils at the disposal site, is the high cost associated with the manufacturing and transportation. In this study, a new solidified dredged fill (SDF) technique and a new additive is proposed and their applications into practice are discussed. Unlike the conventional approach, the dredged marine soils were mixed with the solidifiers using a new designed mixing technique prior to its transport to site, which could significantly reduce the cost of site machinery and effectively reclaim land with adequate engineering properties necessary …

A Partially Drained Model For Soft Soils Under Cyclic Loading Considering Cyclic Parameter Degradation, Buddhima Indraratna, Jing Ni, Cholachat Rujikiatkamjorn, Rui Zhong

Faculty of Engineering and Information Sciences - Papers: Part A

Cyclic loading induced foundation instabilities including loss of bearing capacity and excessive plastic deformation of the subgrade are among the major concerns for the design and construction of transport infrastructure. There were limited studies on the modelling of cyclic loading of soft soils due to its complexities compared to static loading. In this study, a model for soft clays under partially drained condition subject to cyclic triaxial loading has been developed based on the Modified Cam-clay theory. The yield surface contraction for elastic unloading was governed by two additional cyclic degradation parameters to the modified Cam-clay model. This model was …

Relationship Between Learning In The Engineering Laboratory And Student Evaluations, Sasha Nikolic, Thomas F. Suesse, Thomas Goldfinch, Timothy J. Mccarthy

Faculty of Engineering and Information Sciences - Papers: Part A

BACKGROUND OR CONTEXT This study is built upon previous research that developed an instrument to measure the learning objectives of the laboratory across the cognitive, psychomotor and affective domains with research that investigated student evaluations of sessional laboratory demonstrators, laboratory experiments and facilities. This research highlighted the importance of laboratory work in engineering education, and the need to improve our understanding of how learning occurs in the laboratory. PURPOSE OR GOAL Student evaluations are heavily used in higher education, and a greater understanding is needed on how these evaluations relate to learning. APPROACH An instrument used to measure learning in …

Evaluation Of A Partial Ring Design For The Insert Spect/Mri System, Kell Erlandsson, Debora Slavado, Alexandre B. Bousse, Brian F. Hutton

Faculty of Engineering and Information Sciences - Papers: Part A

The aim of the INSERT project is to develop a SPECT insert for a commercial MRI system, for performing simultaneous SPECT/MRI brain studies in humans. We have previously investigated various design options for the detector system, based on a complete ring of detectors. We are now considering a partial ring, due to space limitations. We have investigated the degradation in image quality with a partial ring as compared to a full ring, and the possibility of addressing the limitations by utilising MRI data during reconstruction. Noise-free data were generated by forward-projecting a cylindrical phantom with spherical inserts for a full-ring …

A Visual One-Time Password Authentication Scheme Using Mobile Devices, Yang-Wai Chow, Willy Susilo, Man Ho Au, Ari Moesriami Barmawi

Faculty of Engineering and Information Sciences - Papers: Part A

The use of passwords for user authentication has become ubiquitous in our everyday lives. However, password theft is becoming a common occurrence due to a variety of security problems associated with passwords. As such, many organizations are moving towards adopting alternative solutions like one-time passwords, which are only valid for a single session. Nevertheless, various one-time password schemes also suffer from a number of drawbacks in terms of their method of generation or delivery. This paper presents the design of a challenge-response visual one-time password authentication scheme that is to be used in conjunction with the camera on a mobile …

Generalized Closest Substring Encryption, Fuchun Guo, Willy Susilo, Yi Mu

Faculty of Engineering and Information Sciences - Papers: Part A

We propose a new cryptographic notion called generalized closest substring encryption. In this notion, a ciphertext encrypted with a string S can be decrypted with a private key of another string S′, if there exist a substring of S, i.e. S^, and a substring of S′, i.e. S^′, that are "close" to each other measured by their "overlap distance". The overlap distance between S^ and S^′ is the number of identical positions at which the corresponding symbols are the same. In comparison with other encryption systems, the closest notion is the Fuzzy-IBE proposed by Sahai and Waters. The main difference …

Broadcast Encryption With Dealership, Clementine Gritti, Willy Susilo, Thomas Plantard, Kaitai Lang, Duncan S. Wong

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, we introduce a new cryptographic primitive called broadcast encryption with dealership. This notion, which has never been discussed in the cryptography literature, is applicable to many realistic broadcast services, for example subscription-based television service. Specifically, the new primitive enables a dealer to bulk buy the access to some products (e.g., TV channels) from the broadcaster, and hence, it will enable the dealer to resell the contents to the subscribers with a cheaper rate. Therefore, this creates business opportunity model for the dealer. We highlight the security consideration in such a scenario and capture the security requirements in …

Micro Learning Adaptation In Mooc: A Software As A Service And A Personalized Learner Model, Geng Sun, Tingru Cui, William Guo, Ghassan Beydoun, Dongming Xu, Jun Shen

Faculty of Engineering and Information Sciences - Papers: Part A

Micro learning is gradually becoming a common learning mode in massive open online course learning (MOOC). We illustrate a research strategy to formalize and customize micro learning resources in order to meet personal demands at the real time. This smart micro learning environment can be organized by a Software as a Service (SaaS) we newly designed, in which educational data mining technique is mainly employed to understand learners learning behaviors and recognize learning resource features in order to identify potential micro learning solutions. A learner model with regards to internal and external factors is also proposed for personalization in micro …

Toward Real-Time Multi-Criteria Decision Making For Bus Service Reliability Optimization, Vu The Tran, Peter Eklund, Christopher Cook

Faculty of Engineering and Information Sciences - Papers: Part A

This paper addresses issues associated with the real-time control of public transit operations to minimize passenger wait time: namely vehicle headway, maintenance of passenger comfort, and reducing the impact of control strategies. The randomness of passenger arrivals at bus stops and external factors (such as traffic congestion and bad weather) in high frequency transit operations often cause irregular headway that can result in decreased service reliability. The approach proposed in this paper, which has the capability of handling the uncertainty of transit operations based on Multi-objective evolutionary algorithm using a dynamic Bayesian network, applies preventive strategies to forestall bus unreliability …

Factors Influencing Nursing Time Spent On Administration Of Medication In An Australian Residential Aged Care Home, Siyu Qian, Ping Yu, David M. Hailey, Ning Wang

Faculty of Engineering and Information Sciences - Papers: Part A

Aims: To examine nursing time spent on administration of medications in a residential aged care (RAC) home, and to determine factors that influence the time to medicate a resident. Background: Information on nursing time spent on medication administration is useful for planning and implementation of nursing resources.

Methods: Nurses were observed over 12 morning medication rounds using a time-motion observational method and field notes, at two high-care units in an Australian RAC home.

Results: Nurses spent between 2.5 and 4.5 hours in a medication round. Administration of medication averaged 200 seconds per resident. Four factors had significant impact on medication …

Loss-Tolerant Bundle Fragment Authentication For Space-Based Dtns, Xixiang Lv, Yi Mu, Hui Li

Faculty of Engineering and Information Sciences - Papers: Part A

Bundle authentication, which ensures the authenticity and integrity of bundles, is critical in space Delay/disruption-Tolerant Networks (DTNs). When bundle fragment services are needed, the previous solutions directly using digital signatures suffer from heavy computational costs and bandwidth overheads. This paper addresses the issue of fragment authentication for Bundle Protocol by exploiting erasure codes and the batch transmission characteristic of DTNs. Erasure codes are adopted to allow all the fragments of a bundle to equally share only one signature, to tolerate high delays as well as unexpected loss of connectivity. Following this generic idea, we present two approaches, both of which …

Using Solar Photovoltaic Thermal Collectors In Phase Change Materials Enhanced Buildings For Thermal Performance Management, Zhenjun Ma, Wenye Lin, Mohammed I. Sohel

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents the investigation of using air-based solar photovoltaic thermal (PVT) collectors in phase change materials (PCMs) enhanced buildings for effective thermal management. PVT collectors are used to generate electricity and provide low grade heating energy to buildings for winter space heating. PCMs are either integrated into building walls to increase the local thermal mass or used as a temporary centralized thermal storage to store the low grade thermal energy derived from the PVT collectors. The thermal performance of buildings due to the integration of the PVT collectors and PCMs is tested and evaluated through computer simulations. It is …

Bacterial Cellulose As A Support For The Growth Of Retinal Pigment Epithelium, Sara Goncalves, Jorge Padrao, Ines P. Rodrigues, J P. Silva, Vitor Sencadas, Senentxu Lanceros-Méndez, Henrique Girao, F Dourado, L R. Rodrigues

Faculty of Engineering and Information Sciences - Papers: Part A

The feasibility of bacterial cellulose (BC) as a novel substrate for retinal pigment epithelium (RPE) culture was evaluated. Thin (41.6 ± 2.2 μm of average thickness) and heat-dried BC substrates were surface-modified via acetylation and polysaccharide adsorption, using chitosan and carboxymethyl cellulose. All substrates were characterized according to their surface chemistry, wettability, energy, topography, and also regarding their permeability, dimensional stability, mechanical properties, and endotoxin content. Then, their ability to promote RPE cell adhesion and proliferation in vitro was assessed. All surface-modified BC substrates presented similar permeation coefficients with solutes of up to 300 kDa. Acetylation of BC decreased it's …

Development Of Electrospun Photocatalytic Tio2-Polyamide-12 Nanocomposites, E Cossich, R Bergamasco, M T. Pessoa De Amorim, P M. Martins, J Marques, Carlos J. Tavares, Senentxu Lanceros-Méndez, Vitor Sencadas

Faculty of Engineering and Information Sciences - Papers: Part A

Titanium dioxide (TiO2) in different forms such as films, fibers or particles are being extensively studied for removal of contaminants from aquatic environments due to its outstanding photocatalytic activity. This work reports the development of TiO₂-polyamide 12 electrospun fiber mats. A systematic study on the influence of electrospun processing parameters on polymer fiber morphology was performed. It was observed that the average fiber diameter is mainly influenced by polymer concentration and average fiber diameters between 404 ± 82 nm and 1442 ± 360 nm were obtained. Polyamide-12 (PA-12) was used as a polymer matrix and electrospun with 0, …