Physical Sciences and Mathematics Commons^™

Perception Of Human Gestures Through Observing Body Movements, Amir S. Hesami, Fazel Naghdy, David A. Stirling, Harold C. Hill

Faculty of Informatics - Papers (Archive)

A new approach to modelling and classification of human gait is proposed. Body movements are obtained using a sensor suit that records inertial signals that are subsequently modelled on a humanoid frame with 23 degrees of freedom (DOF). Measured signals include position, velocity, acceleration, orientation, angular velocity and angular acceleration. Using a range of concurrent features extracted from the sensor signals, a system using induced symbolic classification models, such as decision trees or rule sets, has been used for classification of identity. It is anticipated that this approach will also enable the identification of a variety of gestures. The feasibility …

The 2003 Australian Breast Health Survey: Survey Design And Preliminary Results, Elmer V. Villanueva, Sandra C. Jones, Caroline Nehill, Simone K. Favelle, David G. Steel, Don Iverson, Helen Zorbas

Faculty of Informatics - Papers (Archive)

The Breast Health Surveys, conducted by the National Breast Cancer Centre (NBCC) in 1996 and 2003, are designed to gain insight into the knowledge, attitudes and behaviours of a nationally representative sample of Australian women on issues relevant to breast cancer. In this article, we focus on major aspects of the design and present results on respondents' knowledge about mammographic screening. Methods: The 2003 BHS surveyed English-speaking Australian women aged 3069 without a history of breast cancer using computer-assisted telephone interviewing. Questions covered the following themes: knowledge and perceptions about incidence, mortality and risk; knowledge and behaviour regarding early detection, …

Barriers To Using Ict In Mathematics Teaching: Issues In Methodology, Rebecca Hudson, Anne L. Porter, Mark I. Nelson

Faculty of Informatics - Papers (Archive)

In this paper we examine the barriers to using ICT of secondary mathematics teachers in the classroom. The sample contained 114 mathematics teachers from public secondary schools in New South Wales (Australia). The instrument used in this study was a survey questionnaire mailed to secondary schools in the New South Wales Department of Education and Training. The questionnaire design is a closed-response with five open-ended questions. Results of the study showed that lack of access to computer labs is the number one barrier to using ICT in the classroom. But when a second analysis using a logistic regression analysis modeling …

Adaptive Task Allocation For P2p-Based E-Services Composition, Jun Shen, Shuai Yuan

Faculty of Informatics - Papers (Archive)

To effectively manage the task allocation, especially when handling with numerous different peers’ qualities, is one of the greatest challenges to be faced in order to guarantee the success of P2P-based e-services composition. In this context, various QoS descriptive frameworks and Web services technologies (such as WSDL and BPEL) are being considered as the most affordable solutions to promote the performance of decentralized e-services, through applying strategies like QoS ontologies and related optimization algorithms globally or locally. Nonetheless, most P2P-based service selection and composition approaches applied nowadays lack dynamism and autonomy. In this paper, we first propose an extension of …

P2p Distributed Intrusion Detections By Using Mobile Agents, Dayong Ye, Quan Bai, Minjie Zhang, Zhen Ye

Faculty of Informatics - Papers (Archive)

Traditional hierarchical intrusion detection systems have a central manager which attracts hackers to attack and might overload when there are too many client requests. To overcome these drawbacks, some researchers suggested to apply Peer-to-Peer approaches in intrusion detection. Most current Peer-to-Peer intrusion detection systems only allow hosts to collect related information from "neighbours" (one hop hosts). The limitation of information sources may lead a system to make inaccurate decisions. In this paper, we propose a Mobile Agent Based Peer-to-Peer Distributed Intrusion Detection Framework. Agents are included in this framework to achieve intrusion detections. In addition, a mobile agent migration strategy …

Resource Price Turbulence And Macroeconomic Adjustment For A Resource Exporter: A Conceptual Framework For Policy Analysis, Grant M. Cox, Charles Harvie

Faculty of Informatics - Papers (Archive)

The increased demand for energy and other resources in global markets, particularly arising from therapidly developing economies of China and India, has resulted in considerable turbulence in resourceprices, and most obviously that of oil. The recent magnitude of change, both positive and negative, inresource prices and their macroeconomic implications is of considerable contemporary importance forboth resource importing and exporting economies. For a resource exporting economy, such as that ofAustralia, the resource price boom had a number of beneficial effects: increased government taxationrevenues, increased employment and higher wages in the resource and resource related sectors,increased spending in the domestic economy and …

Adaptive Calibration For Prediction Of Finite Population Totals, Raymond L. Chambers, Robert Graham Clark

Faculty of Informatics - Papers (Archive)

Sample weights can be calibrated to reflect the known population totals of a set of auxiliary variables. Predictors of finite population totals calculated using these weights have low bias if these variables are related to the variable of interest, but can have high variance if too many auxiliary variables are used. This article develops an adaptive calibration approach, where the auxiliary variables to be used in weighting are selected using sample data. Adaptively calibrated estimators are shown to have lower mean squared error and better coverage properties than non-adaptive estimators in many cases.

Characterising The Interactions Between Unicast And Broadcast In Ieee 802.11 Ad Hoc Networks, Jerry Chun-Ping Wang, D. Franklin, Mehran Abolhasan, Farzad Safaei

Faculty of Informatics - Papers (Archive)

This paper investigates the relative performance of unicast and broadcast traffic traversing a one-hop ad hoc network utilising the 802.11 DCF. An extended Markov model has been developed and validated through computer simulation, which successfully predicts the respective performance of unicast and broadcast in a variety of mixed traffic scenarios. Under heavy network traffic conditions, a significant divergence is seen to develop between the performance of the two traffic classes - in particular, when network becomes saturated, unicast traffic is effectively given higher precedence over broadcast. As a result, the network becomes dominated by unicast frames, leading to poor rates …

Correlations Of Length Distributions Between Non-Coding And Coding Sequences Of Arabidopsis Thaliana, Rachel Caldwell, Yan-Xia Lin, Ren Zhang

Faculty of Informatics - Papers (Archive)

Gene length and organization are important attributes of genomics. With a large amount of sequence data becoming available, statistical analyses can be applied to this data and will offer beneficial output to research communities. Previous work in this field has focused on protein length and its coding region, while we are also investigating the non-coding regions, as well as trying to uncover any potential correlation that may exist between the regions. Analysis on the Arabidopsis thaliana found there was a strong correlation between the coding sequence length and the 3 UTR region, conditional on the 5 UTR ratios. These results …

Implementation Of Artificial Intelligence Technique To Model Arc Furnace Responses, A.M.O Haruni, Michael Negnevitsky, M.E Haque, Kashem Muttaqi

Faculty of Informatics - Papers (Archive)

Random variations of the bus voltage and power consumption of an electric arc furnace (EAF) have a significant impact on power generation equipment, transient stability of the power system network and power quality to other interconnected loads. Therefore, an accurate representation of the load's dynamic behaviour under various system disturbances is very important. This paper presents an arc furnace model using adaptive neuro-fuzzy inference system (ANFIS) in order to capture random, non-linear and time-varying load pattern of an arc furnace. To evaluate the performance of the proposed model, several case studies are presented where the outputs of the proposed model …

Robotic Machining: Material Removal Rate Control With A Flexible Manipulator, Hui Zhang, Zengxi Pan

Faculty of Informatics - Papers (Archive)

Practical material removal rate (MRR) control strategies for industrial robot are presented in this paper. Based on a force control platform, both force signal and spindle power information could be used for MRR measurement. Three different control methods, PI control, adaptive control and fuzzy control, are implemented to satisfy various process requirements. Performance and experimental results are presented and compared. With controlled material removal rate (CMRR), the productivity of robotic machining process could be increased dramatically.

Power Quality Survey Factor Analysis Using Multivariable Linear Regression (Mvlr), Chandana Herath, Victor J. Gosbell, Sarath Perera, David A. Stirling

Faculty of Informatics - Papers (Archive)

During the past two decades, there has been a considerable number of Power Quality (PQ) monitoring programs completed throughout the world. The information collected during these surveys can provide a detailed picture of the expected electrical environment help utilities to plan their future networks in relation to power quality performance. The mass of data gathered for a sample of sites of a large-scale power quality (PQ) survey of this nature has the potential to reveal good and bad influences on power quality if an appropriate procedure for analysis can be determined. If it is known which characteristics are more important …

A Five-Round Algebraic Property Of The Advanced Encryption Standard, Jianyong Huang, Jennifer Seberry, Willy Susilo

Faculty of Informatics - Papers (Archive)

This paper presents a five-round algebraic property of the Advanced Encryption Standard (AES). In the proposed property, we modify twenty bytes from five intermediate values at some fixed locations in five consecutive rounds, and we show that after five rounds of operations, such modifications do not change the intermediate result and finally still produce the same ciphertext. We introduce an algorithm named δ, and the algorithm accepts a plaintext and a key as two inputs and outputs twenty bytes, which are used in the five-round property. We demonstrate that the δ algorithm has 20 variants for AES-128, 28 variants for …

Multipath Diversity Of Precoded Ofdm With Linear Equalization, Xiaojing Huang

Faculty of Informatics - Papers (Archive)

This paper settles a controversy over the multipath diversity performance of the precoded orthogonal frequency division multiplexing system with the linear equalization. Through the asymptotical analysis of the bit error rates with extreme system parameters, a comprehensive understanding of the linear equalization's behavior in the frequency-selective multipath fading channels is gained. Compared with the optimum maximum-likelihood detection, the diversity performance of the linear equalization can be well described by an asymptotical signal-to-noise ratio (SNR) degradation, which reveals that the linear equalization can achieve the maximum multipath diversity within an operational SNR range but will lose diversity advantage as SNR increases.

The Social Impact Of National Security Technologies: Epassports, E911 And Mobile Alerts, Holly Tootell

Faculty of Informatics - Papers (Archive)

This paper explores the adoption of emerging technologies for the purposes of national security. The three technologies chosen were ePassports, E911 and mobile alerts. The study uses a content analysis methodology drawing on popular media documentation to extract the major social and technological impacts of the technologies on citizens as they were reported. The find i ngs of the study indicate that reactions to the three technologies differed. ePassports were considered vastly different to E911 and mobile alerting predominantly because they were seen to be a controlling technology, whereas E911 and mobile alerting were viewed to be about safety and …

On The Use Of Quasi-Orthogonal Space-Time-Frequency Codes In Mb-Ofdm Uwb, Le Chung Tran, Alfred Mertins

Faculty of Informatics - Papers (Archive)

Space-Time-Frequency Codes (STFCs), which haverecently been proposed in the literature for Multiband OFDMUltra-Wideband (MB-OFDM UWB) systems to improve thesystem capacity, error performance and wireless communicationrange, are all constructed based on orthogonal structures. Thispaper examines the application of Quasi-Orthogonal STFCs(QOSTFCs) to enhance further either data rate or error performancein the recently proposed STFC MB-OFDM UWB systems.It will be shown that QOSTFCs can provide significantly bettererror performance, compared to the conventional MB-OFDMUWB (without STFCs) as well as to the Orthogonal STFCs(OSTFCs) of the same order, at the same data rate, withoutincreasing the total transmission power. Equivalently, QOSTFCscan provide higher data rates with …

Active Exploration Of Emerging Themes In A Study Of Object-Oriented Requirements Engineering: The 'Evolutionary Case' Approach, Linda L. Dawson

Faculty of Informatics - Papers (Archive)

The evolutionary case approach provides a framework for qualitative case study research in information systems (IS). It uses revelation, reinforcement, reflection and re-examination to explicitly explore emerging themes in interpretive case study research.

The method is based on the progressive development of a theoretical model grounded initially in the literature and then refined using sequential case studies grounded in practice. The method addresses the gap which often separates data from conclusions in qualitative case study research by documenting the “revealed” and “reinforced” changes in the theoretical model as it evolves from the empirical data.

The paper provides an illustrative study …

Control Of Energy Storage Interface With A Bidirectional Converter For Photovoltaic Systems, K.N Hasan, M.E Haque, Michael Negnevitsky, Kashem Muttaqi

Faculty of Informatics - Papers (Archive)

Efficient energy storage is one of the greatest concerns for renewable power generation. This paper focuses on the control of a battery management system (BMS) for photovoltaic (PV) applications with a high efficiency bidirectional converter. The proposed BMS control strategy utilizes the dc bus power and battery state of charge (SOC) for the charging and discharging of the battery with a bidirectional converter. The bidirectional converter includes fewer components and switches, has less switching losses with zero voltage switching, and has high gain buck-boost operations. A new control algorithm of charging-discharging control for the battery storage system is proposed. The …

The Wii Remote As An Input Device For 3d Interaction In Immersive Head-Mounted Display Virtual Reality, Yang-Wai Chow

Faculty of Informatics - Papers (Archive)

There has been a lot of interest regarding the possibilities that the motion sensing technology in the Wii Remote can offer. This study investigates the feasibility of using the Wii Remote for 3D interaction in immersive Head-Mounted Display (HMD) virtual reality. Normal usage of the Wii Remote requires that the controller to be pointed in a certain direction, typically towards the display. The requirements of an input device for interaction in immersive HMD virtual reality differ from that of normal display systems, in that the user should ideally be able to turn around in the virtual environment. A number of …

Optimisation Of Distributed Generation Units And Shunt Capacitors For Economic Operation Of Distribution Systems, Kai Zou, Sarath Perera, Kashem Muttaqi, Ashish P. Agalgaonkar

Faculty of Informatics - Papers (Archive)

The integration of Distributed Generation (DG) units and shunt capacitors can be considered as an alternative approach for distribution system expansion planning not only to improve power supply quality and reliability, but also to defer major system updates. In this paper, the techno-economic issues of distribution system expansion planning with optimal sizing and siting of DG units and shunt capacitors are addressed. The minimisation of overall investment cost with the integration of DG units and shunt capacitors is assessed with the consideration of supply quality, reliability and energy loss. A new planning methodology by using Particle Swarm Optimisation (PSO) is …

Robotic Machining From Programming To Process Control: A Complete Solution By Force Control, Zengxi Pan, Hui Zhang

Faculty of Informatics - Papers (Archive)

This paper aims to present the critical issues and methodologies to improve robotic machining performance with flexile industrial robots. Design/methodology/approach – A complete solution using active force control is introduced to address various issues during the robotic machining process.

Programming complex couture parts without a CAD model is made easy by using force control functions such as lead-through and path-learning. The problem of process control is treated with a novel methodology that consists of stiffness modeling, real-time deformation compensation for quality and controlled material removal rate for process efficiency.

Experimental results showed that higher productivity as well as better surface …

Feature Based Stereo Correspondence Using Moment Invariant, Prashan Premaratne, Farzad Safaei

Faculty of Informatics - Papers (Archive)

Autonomous navigation is seen as a vital tool in harnessing the enormous potential of Unmanned Aerial Vehicles (UAV) and small robotic vehicles for both military and civilian use. Even though, laser based scanning solutions for Simultaneous Location And Mapping (SLAM) is considered as the most reliable for depth estimation, they are not feasible for use in UAV and land-based small vehicles due to their physicalsize and weight. Stereovision is considered as the best approach for any autonomous navigation solution as stereo rigs are considered to be lightweight and inexpensive. However, stereoscopy which estimates the depth information through pairs of stereo …

A Pragmatic Gis-Oriented Ontology For Location Based Services, Jun Shen, Aneesh Krishna, Shuai Yuan, Ke Cai, Yuemin Qin

Faculty of Informatics - Papers (Archive)

With advances in automatic position sensing and wireless connectivity, location-based services (LBS) are rapidly developing, particularly in fields of geographic, tourism and logistic information systems. Currently, Web service has been viewed as one of most significant innovations in business industry, and designed on demand to provide spatial related information for LBS consumption. However, the traditional Web Service Description Language (WSDL) cannot meet those requirements, as WSDL is not able to support semantic content and information. In recent years, Ontology came up with an effective approach to enhance service description, automated discovery, dynamic composition, enactment, and other tasks such as managing …

The Fourier Spectrum Analysis Of Optical Feedback Self-Mixing Signal Under Weak And Moderate Feedback, Xiaojun Zhang, Jiangtao Xi, Yanguang Yu, Joe F. Chicharo

Faculty of Informatics - Papers (Archive)

The spectrum characteristics of self-mixing signals observed in optical feedback self-mixing interferometry (OFSMI) is studied in this paper. The purpose is to provide guidance for the design of pre-processing techniques for eliminating noise or disturbance. The influence of two important parameters of the OFSMI system on the spectrum, that is, the optical feedback factor and the linewidth enhancment factor, are measured by means of Discrete Fourier transform (DFT). The simulated results show that, at a weak feedback, the OFSMI signals are strictly band limited in nature, with the cut-off frequencies being the vibration frequency and the fringe frequency respectively. Also …

A Scalable Lightweight Distributed Crawler For Crawling With Limited Resources, Milly W. Kc, Markus Hagenbuchner, Ah Chung Tsoi

Faculty of Informatics - Papers (Archive)

Web page crawlers are an essential component in a number of Web applications. The sheer size of the Internet can pose problems in the design of Web crawlers. All currently known crawlers implement approximations or have limitations so as to maximize the throughput of the crawl, and hence, maximize the number of pages that can be retrieved within a given time frame. This paper proposes a distributed crawling concept which is designed to avoid approximations, to limit the network overhead, and to run on relatively inexpensive hardware. A set of experiments, and comparisons highlight the effectiveness of the proposed approach.

Autoignition Of Hydrocarbons In A Batch Reactor: Analysis Of A Reduced Model, Mark I. Nelson, E Balakrishnan

Faculty of Informatics - Papers (Archive)

n the late 1960s Gray and Yang developed the first reduced kinetic model for the oxidation of hydrocarbon fuels that qualitatively described many features observed experimentally. Since then a number of reduced kinetic models have been proposed in the literature. In this contribution we analyse the steady-state behaviour of one such scheme. The chemical component of the model contains four chemical species undergoing six reactions. By making a pool-chemical approximation this system is reduced to three coupled non-linear differential equations: a temperature equation and equations for two reactive chemical intermediates. It is shown that any steady-state solution of this model …

The Importance Of Community Engagement In Policy Development: An Australian Case Study, Alison Norris, Mark Freeman

Faculty of Informatics - Papers (Archive)

The Australian Domain Name Administrators have launched a new domain name space designed specifically for community groups to develop community Websites for the benefit of the local community. The purpose of the scheme under which these domains are issued is to link community members through community-managed Websites, and to encourage broad community participation and engagement. Despite broad community engagement during initial development, many changes have since been made to the policy governing these new domain names. This paper presents an overview of the scheme under which these community domains can be used, and identifies the changes made to the policy …

Modelling Of Hydraulic Governor-Turbine For Control Stabilisation, Michael Negnevitsky, Kashem Muttaqi, Yin Chin Choo

Faculty of Informatics - Papers (Archive)

Power system performance is affected by dynamic characteristics of hydraulic governor-turbines during and following any disturbance, such as occurrence of a fault, loss of a transmission line or a rapid change of load. Accurate modelling of hydraulic governor-turbines is essential to characterise and diagnose the system response during an emergency. In this article, both detailed and simplified hydraulic systems governed by proportional-integral-derivative and proportional-integral controllers are modelled. This article examines their transient responses to disturbances through simulation in Matlab/Simulink. The article also investigates the dynamic performance of an isolated hydraulic system through evaluating stability margins, eigenvalues, root loci and frequency …

Mechanisms That Impact Online Auction Trust, Glenn R. Bewsell

Faculty of Informatics - Papers (Archive)

This research investigates mechanisms that impact trust and trust as an organising principle at online auctions using data collected from a community website. Qualitative analysis is used to make sense of the data collected and to identify key factors that impact trust and organising for trust.As a result of the discussion, I attempt to explore key factors that impact trust at online auctions and relate the discussion to previous research. This research adds to the understanding of trust theory and online auction trust, and this research can be used by practitioners to better support users and improve the design of …

Output Quality Evaluation Of Photovoltaic Systems With Different Current Control Methods Of Switch-Mode Converters, K. N. Hasan, Md Enamul Haque, Michael Negnevitsky, Kashem Muttaqi

Faculty of Informatics - Papers (Archive)

This paper presents a comparative assessment of the current control methods (CCM) of switch-mode converters for photovoltaic (PV) applications. In this paper, average current control, current programmed control, hysteresis current control and nonlinear carrier control methods are addressed considering input fluctuations and load variations for PV systems. Dynamic responses of PV systems are investigated and harmonic analysis is performed. Performances of the above current controllers are examined through simulation and the results are presented. The results show that the selection of different current control techniques depends on the working conditions and the area of applications.