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Articles 151 - 180 of 2013
Full-Text Articles in Physical Sciences and Mathematics
Post-Release Mortality Of Angled Sand Mullet (Myxus Elongatus: Mugilidae), Matt K. Broadhurst, Paul A. Butcher, Brian R. Cullis
Post-Release Mortality Of Angled Sand Mullet (Myxus Elongatus: Mugilidae), Matt K. Broadhurst, Paul A. Butcher, Brian R. Cullis
Faculty of Informatics - Papers (Archive)
Grey mullets (Mugilidae) are important to recreational fisheries throughout the developed world. In Australia, several species are angled and then released in large numbers; all with virtually unknown fate. In response to the need for such data to facilitate effective stock management, this study sought to quantify the post-release mortality and key causal factors for sand mullet (Myxus elongatus). A total of 125 fish were conventionally angled, and then released along with 50 controls into floating cages in a south eastern Australian estuary, where they were monitored for four days. Five treatment fish died, providing a non-significant mortality of 4%. …
Detecting Humans Under Occlusion Using Variational Mean Field Method, Duc Thanh Nguyen, Philip Ogunbona, Wanqing Li
Detecting Humans Under Occlusion Using Variational Mean Field Method, Duc Thanh Nguyen, Philip Ogunbona, Wanqing Li
Faculty of Informatics - Papers (Archive)
This paper proposes a human detection method using variational mean field approximation for occlusion reasoning. In the method, parts of human objects are detected individually using template matching. Initial detection hypotheses with spatial layout information are represented in a graphical model and refined through a Bayesian estimation. In this paper, mean field method is employed for such an estimation. The proposed method was evaluated on the popular CAVIAR-INRIA dataset. Experimental results show that the proposed algorithm is able to detect humans in severe occlusion within reasonable processing time.
A Preliminary Investigation Of Complex Adaptive Systems As A Model For Explaining Organisational Change Caused By The Introduction Of Health Information Systems, Kieren Diment, Ping Yu, Karin Garrety
A Preliminary Investigation Of Complex Adaptive Systems As A Model For Explaining Organisational Change Caused By The Introduction Of Health Information Systems, Kieren Diment, Ping Yu, Karin Garrety
Faculty of Informatics - Papers (Archive)
This paper documents the preliminary development of a framework for evaluating organisational change processes during the implementation of an electronic nursing documentation system in residential aged care facilities. It starts with a brief outline of organisational change processes. This is followed by a more detailed exposition of the principles underlying complex adaptive systems (CAS) theory, where we explain how mathematical concepts can be used to illuminate qualitative research approaches. Finally we present some preliminary findings on the facilitators and barriers for the introduction of the electronic documentation system, explained with reference to the CAS theory, based on analysis of interviews …
Understanding The Conducting States Of Active And Passive Switches In An Inverter Circuit Used For Power System Applications, Danny Sutanto, B.P. Divakar, K.W.E. Cheng
Understanding The Conducting States Of Active And Passive Switches In An Inverter Circuit Used For Power System Applications, Danny Sutanto, B.P. Divakar, K.W.E. Cheng
Faculty of Informatics - Papers (Archive)
Bi-directional inverter circuits are commonly used in many applications in power systems, such as in FACTS devices, energy storage systems and active power filters. Many power engineering students however find it difficult to understand the conducting states of the active switches (transistors, IGBTs) and the passive switches (the antiparallel diodes connected across the active switches). It seems a mystery to them that power can flow from a lower voltage ac system to a higher voltage dc system to charge the energy storage system. This paper proposes a simple chart that intuitively explains how to determine the states (either conducting or …
T-S Fuzzy H Tracking Control Of Input Delayed Robotic Manipulators, Haiping Du, Weihua Li
T-S Fuzzy H Tracking Control Of Input Delayed Robotic Manipulators, Haiping Du, Weihua Li
Faculty of Informatics - Papers (Archive)
Time delays are often encountered by practical control systems while they are acquiring, processing, communicating, and sending signals. Time delays may affect the system stability and degrade the control system performance if they are not properly dealt with. Taking the classical robot control problem as an example, the significant effect of time delay on the closed-loop system stability has been highlighted in the bilateral teleoperation, where the communication delay transmitted through a network medium has been received widespread attention and different approaches have been proposed to address this problem (Hokayem and Spong, 2006). In addition, examples like processing delays in …
An Assessment Tool For E-Government System Performance: A Citizen-Centric Model, Shatha A. Al-Haddad, Peter Hyland, Geoffrey Hubona
An Assessment Tool For E-Government System Performance: A Citizen-Centric Model, Shatha A. Al-Haddad, Peter Hyland, Geoffrey Hubona
Faculty of Informatics - Papers (Archive)
Governments worldwide have, increasingly, implemented e-government initiatives for their potential significant benefits; among which, delivering better services to citizens through increasing citizens' convenience, satisfaction, and independence; and saving their time, effort, and cost. Achieving each benefit is an objective to these governments and fulfilling each objective is considered a critical success factors. Hence, governments need to assess the extent to which they were able to obtain their preset goals. This study merely focuses on the citizens' perspective of the evaluation. However, the literature seems to lack studies that propose such a sufficient evaluation tool that has been reliably validated. Therefore, …
Potential Reduction In Energy Use From A High Speed Rail Network In Australia, Philip Laird
Potential Reduction In Energy Use From A High Speed Rail Network In Australia, Philip Laird
Faculty of Informatics - Papers (Archive)
High Speed Rail or HSR with electric passenger trains using steel wheels on steel rails with maximum operating speeds of 250km/h or more is now operational in 12 countries. It is now under review in Australia. The paper considers energy use on the 10 top routes of the Melbourne-Sydney and Sydney-Brisbane corridors and finds that HSR was in place by 2020, HSR could reduce the use of aviation fuel by over 450 million litres each year. External costs and Sydney airport issues are also noted.
Supporting Developers In Complex Systems Modelling, Antonio A. Lopez-Lorca, Ghassan Beydoun, Rodrigo Martinez-Bejar, Holly Tootell
Supporting Developers In Complex Systems Modelling, Antonio A. Lopez-Lorca, Ghassan Beydoun, Rodrigo Martinez-Bejar, Holly Tootell
Faculty of Informatics - Papers (Archive)
Development of complex systems often requires building a large number of models with many interconnections and dependencies among them. The success of a project can be compromised by cognitive overload or limits of developers, who might miss relationships between elements of the models. Developing Multi-Agent Systems (MAS) is a typical example of where this may occur. Despite of its potential, this technology has not yet been widely adopted by industry due to its complexity and frequent errors in modelling activities. These errors typically propagate to later phases of the MAS development lifecycle, becoming costlier to fix and then lowering the …
Sparsity Issues In Self-Organizing-Maps For Structures, Markus Hagenbuchner, Giovanni Da San Martino, Ah Chung Tsoi, Alessandro Sperduti
Sparsity Issues In Self-Organizing-Maps For Structures, Markus Hagenbuchner, Giovanni Da San Martino, Ah Chung Tsoi, Alessandro Sperduti
Faculty of Informatics - Papers (Archive)
Recent developments with Self-Organizing Maps (SOMs) produced methods capable of clustering graph structured data onto a fixed dimensional display space. These methods have been applied successfully to a number of benchmark problems and produced state-of-the-art results. This paper discusses a limitation of the most powerful version of these SOMs, known as probability measure graph SOMs (PMGraphSOMs), viz., the sparsity induced by processing a large number of small graphs, which prevents a successful application of PMGraphSOM to such problems. An approach using the idea of compactifying the generated state space to address this sparsity problem is proposed. An application to an …
Modelling The Effects Of Moisture Content In Compost Piles, T Luangwilai, H S. Sidhu, M I. Nelson, Xiao Dong Chen
Modelling The Effects Of Moisture Content In Compost Piles, T Luangwilai, H S. Sidhu, M I. Nelson, Xiao Dong Chen
Faculty of Informatics - Papers (Archive)
This paper considers the self-heating process occurring in a compost pile using one- and two-dimensional spatially-dependent models and incorporating terms that account for self-heating due to both biological and oxidative mechanisms. Biological heat generation is known to be present in most industrial processes handling large volumes of bulk organic materials. The heat release rate due to biological activity is modelled by a function which is, at sufficiently low temperatures, a monotonically increasing function of temperature and, at higher temperatures, a monotonically decreasing function of temperature. This functionality represents the fact that microorganisms die or become dormant at high temperatures. The …
Developing Measurements Of The Quality Of Electronic Versus Paper-Based Nursing Documentation In Australian Aged Care Homes, Ning Wang, Ping Yu, David Hailey, Deborah Oxlade
Developing Measurements Of The Quality Of Electronic Versus Paper-Based Nursing Documentation In Australian Aged Care Homes, Ning Wang, Ping Yu, David Hailey, Deborah Oxlade
Faculty of Informatics - Papers (Archive)
Objective: To discuss the experience of developing approaches to measuring the quality of nursing documentation in residential aged care homes. Methods: Three information sources were reviewed to explore approaches in auditing nursing documentation: the current literature, relevant Australian legislative and professional requirements, and organizational nursing documentation practice. Results: Approaches suggested by the literature were mainly focused on three dimensions of nursing documentation: structure and format, process and content. The detailed standards of nursing documentation have been identified by reviewing the relevant Australian legislative and professional requirements and recommendations, and organizational nursing documentation practice. A nursing documentation audit instrument has been …
Spectral Density Estimation Through A Regularized Inverse Problem, Chunfeng Huang, Tailen Hsing, Noel Cressie
Spectral Density Estimation Through A Regularized Inverse Problem, Chunfeng Huang, Tailen Hsing, Noel Cressie
Faculty of Informatics - Papers (Archive)
In the study of stationary stochastic processes on the real line, the covariance function and the spectral density function are parameters of considerable interest. They are equivalent ways of expressing the temporal dependence in the process. In this article, we consider the spectral density function and propose a new estimator that is not based on the periodogram; the estimator is derived through a regularized inverse problem. A further feature of the estimator is that the data are not required to be observed on a grid. When the regularization condition is based on the function's first derivative, we give the estimator …
On Twisted Higher-Rank Graph C*-Algebras, Alex Kumjian, David A. Pask, Aidan Sims
On Twisted Higher-Rank Graph C*-Algebras, Alex Kumjian, David A. Pask, Aidan Sims
Faculty of Informatics - Papers (Archive)
We define the categorical cohomology of a k-graph and show that the first three terms in this cohomology are isomorphic to the corresponding terms in the cohomology defined in our previous paper. This leads to an alternative characterisation of the twisted k-graph C*-algebras introduced there. We prove a gauge-invariant uniqueness theorem and use it to show that every twisted k-graph C*-algebra is isomorphic to a twisted groupoid C*-algebra. We deduce criteria for simplicity, prove a Cuntz-Krieger uniqueness theorem and establish that all twisted k-graph C*-algebras are nuclear and belong to the bootstrap class.
Integrating The Projective Transform With Particle Filtering For Visual Tracking, Philippe L. Bouttefroy, Abdesselam Bouzerdoum, Son Lam Phung, A. Beghdadi
Integrating The Projective Transform With Particle Filtering For Visual Tracking, Philippe L. Bouttefroy, Abdesselam Bouzerdoum, Son Lam Phung, A. Beghdadi
Faculty of Informatics - Papers (Archive)
This paper presents the projective particle filter, a Bayesian filtering technique integrating the projective transform, which describes the distortion of vehicle trajectories on the camera plane. The characteristics inherent to traffic monitoring, and in particular the projective transform, are integrated in the particle filtering framework in order to improve the tracking robustness and accuracy. It is shown that the projective transform can be fully described by three parameters, namely, the angle of view, the height of the camera, and the ground distance to the first point of capture. This information is integrated in the importance density so as to explore …
A Hot Metal Temperature Predictor Based On Hybrid Decision Tree Techniques, Chao Sun, David A. Stirling, Bryan Wright, Paul Zulli, Christian Ritz
A Hot Metal Temperature Predictor Based On Hybrid Decision Tree Techniques, Chao Sun, David A. Stirling, Bryan Wright, Paul Zulli, Christian Ritz
Faculty of Informatics - Papers (Archive)
HEAT level control (HLC) is one of the important elements for operating an iron-making blast furnace (BF). The goal of HLC is to maintain the hot metal temperature (HMT) as close to a preset aim as possible. HMT is an important indicator of both the product quality and fuel efficiency, and is measured from tapped out liquid iron. For instance, high values of HMT mean unnecessary fuel consumption together with sub-optimal hot metal chemistry, whilst low values of HMT may indicate insufficient fuel consumption, which may consequently lead to dangerous situation of freezing the slag inside the BF. Once an …
The Analytical Evolution Of Nls Solitons Due To The Numerical Discretization Error, S. M. Hoseini, Timothy R. Marchant
The Analytical Evolution Of Nls Solitons Due To The Numerical Discretization Error, S. M. Hoseini, Timothy R. Marchant
Faculty of Informatics - Papers (Archive)
Soliton perturbation theory is used to obtain analytical solutions describing solitary wave tails or shelves, due to numerical discretization error, for soliton solutions of the nonlinear Schr¨odinger equation. Two important implicit numerical schemes for the nonlinear Schr¨odinger equation, with second-order temporal and spatial discretization errors, are considered. These are the Crank– Nicolson scheme and a scheme, due to Taha [1], based on the inverse scattering transform. The first-order correction for the solitary wave tail, or shelf, is in integral form and an explicit expression is found for large time. The shelf decays slowly, at a rate of t−12 , which …
An Ontology-Based Collaborative Interorganizational Knowledge Management Network, Nelson K. Y. Leung, Sim Kim Lau, Joshua P. Fan, Seung Hwan Kang, Nicole Tsang
An Ontology-Based Collaborative Interorganizational Knowledge Management Network, Nelson K. Y. Leung, Sim Kim Lau, Joshua P. Fan, Seung Hwan Kang, Nicole Tsang
Faculty of Informatics - Papers (Archive)
Web contents can be represented in a structural form by a finite list of vocabularies and their relationships using ontologies. The concept of ontology and its related mediation methods is capable of enhancing the collaboration among Knowledge Management (KM) approaches that only focus on managing organizational knowledge. Those KM approaches are developed in accordance with organizational KM strategies and business requirements without the concern of system interoperation. In this research, an ontology-based collaborative inter-organizational KM network is proposed to provide a platform for organizations to access and retrieve inter-organizational knowledge in a similar domain.
Trust-Based Service Provider Selection In Service-Oriented Environments, Minjie Zhang, Yi Mu, Q. Bai
Trust-Based Service Provider Selection In Service-Oriented Environments, Minjie Zhang, Yi Mu, Q. Bai
Faculty of Informatics - Papers (Archive)
Nowadays, agent-based service-oriented systems have been widely applied in many complex domains such as e-markets, grid systems, e-governments and service-oriented software systems, cross Internet and organizations. In this kind of service-oriented multi-agent systems, service providers (agents) and service consumers (agents) are autonomous entities and can enter and leave environments freely. How to select the most suitable service providers according to the requested services from consumers in such an open and dynamic environment is a very challenging issue. The objectives of this paper include (1) studying the challenging issues of trust-based service provider selection, (2) investigating the current approaches of trust …
Self-Similar Solutions Of Fully Nonlinear Curvature Flows, James Alexander Mccoy
Self-Similar Solutions Of Fully Nonlinear Curvature Flows, James Alexander Mccoy
Faculty of Informatics - Papers (Archive)
We consider closed hypersurfaces which shrink self-similarly under a natural class of fully nonlinear curvature flows. For those flows in our class with speeds homogeneous of degree 1 and either convex or concave, we show that the only such hypersurfaces are shrinking spheres. In the setting of convex hypersurfaces, we show under a weaker second derivative condition on the speed that again only shrinking spheres are possible. For surfaces this result is extended in some cases by a different method to speeds of homogeneity greater than 1. Finally we show that self-similar hypersurfaces with sufficiently pinched principal curvatures, depending on …
What Students Are Telling Us About Why They Left Their Ict Course, Madeleine R. H Roberts, Tanya Mcgill, Tony Koppi
What Students Are Telling Us About Why They Left Their Ict Course, Madeleine R. H Roberts, Tanya Mcgill, Tony Koppi
Faculty of Informatics - Papers (Archive)
Student attrition is an issue of particular concern in the field of ICT because the industry faces staffing shortfalls. The study described in this paper provides further understanding of the causes of attrition from ICT courses by exploring the reasons students give for leaving their ICT courses. An online survey of early leavers from four Australian universities was conducted. The results show that many factors can contribute to the attrition of ICT students, and that for many students it is a combination of issues that leads to their withdrawal. Only a relatively small number of ex-students had experienced serious life …
A Nonparametric Two-Sample Wald Test Of Equality Of Variances, David Allingham, J. C. W Rayner
A Nonparametric Two-Sample Wald Test Of Equality Of Variances, David Allingham, J. C. W Rayner
Faculty of Informatics - Papers (Archive)
We develop a test for equality of variances given two independent random samples of observations. The test can be expected to perform well when both sample sizes are at least moderate and the sample variances are asymptotically equivalent to the maximum likelihood estimators of the population variances. The test is motivated by and is here assessed for the case when both populations sampled are assumed to be normal. Popular choices of test would be the twosample F test if normality can be assumed and Levene’s test if this assumption is dubious. Another competitor is theWald test for the difference in …
Coordinated Utilisation Of Wind Farm Reactive Power Capability For System Loss Optimisation, Lasantha Meegahapola, S Durairaj, D Flynn, B Fox
Coordinated Utilisation Of Wind Farm Reactive Power Capability For System Loss Optimisation, Lasantha Meegahapola, S Durairaj, D Flynn, B Fox
Faculty of Informatics - Papers (Archive)
Most wind farms currently being installed are based upon doubly fed induction generator (DFIG) or direct-drive synchronous generator (DDSG) technology. Given that one of the impacts of introducing distributed generation is an alteration of steady-state power flows and voltages, both technologies are capable of providing local voltage support. Wind farms may, therefore, be included in optimal power flow (OPF) calculations to minimise fuel cost and/or network losses. The IEEE 30-bus system is considered as a case study, comparing fixed-speed induction generator (FSIG) requirements with DFIG capability. Results are presented for a range of DFIG capability modes, at varying system load …
Towards Peer Selection In A Semantically-Enriched Service Execution Framework With Qos Specifications, Jun Shen, Ghassan Beydoun, Graham Low, Brian Henderson-Sellers, Shuai Yuan
Towards Peer Selection In A Semantically-Enriched Service Execution Framework With Qos Specifications, Jun Shen, Ghassan Beydoun, Graham Low, Brian Henderson-Sellers, Shuai Yuan
Faculty of Informatics - Papers (Archive)
This paper promotes an ontology-based multi agent system (MAS) framework to facilitate Peer-to-Peer (P2P) service selection with multiple service properties. P2P-based service has emerged as an important new field in the distributed computing arena. It focuses on intensive service sharing, innovative applications and compositions, and, in some cases, high performance orientation. However, one of the remaining challenges for the P2P-based service composition process is how to effectively discover and select the most appropriate peers to execute the service applications when considering multiple properties of the requested services. By introducing an ontology, different ontology-based e-service profiles can be proposed to facilitate …
Promises And Successful Practice In It Governance: A Survey Of Australian Senior It Managers, Akemi T. Chatfield, Terrence Coleman
Promises And Successful Practice In It Governance: A Survey Of Australian Senior It Managers, Akemi T. Chatfield, Terrence Coleman
Faculty of Informatics - Papers (Archive)
In a global, digital economy, companies increasingly depend on IT for timely information sharing,effective operational control, rapid innovation, speed to market, and customer satisfaction. On theother hand, recent global financial crisis and economic recessions encourage trends for increasedmanagerial scrutiny to reduce IT spending and to increase business value of IT. Globally, concepts ofIT governance (ITG) have proliferated as a solution for improving IT management under businessuncertainty and rapid technological change. However, empirical research on organisational ITGpractice still is lacking and urgently required. This paper, therefore, presents survey results on ITGpractice from a perspective of senior IT managers in Australian private-sector …
An Ambient Multimedia User Experience Feedback Framework Based On User Tagging And Eeg Biosignals, Eva Cheng, Stephen J. Davis, Ian Burnett, Christian H. Ritz
An Ambient Multimedia User Experience Feedback Framework Based On User Tagging And Eeg Biosignals, Eva Cheng, Stephen J. Davis, Ian Burnett, Christian H. Ritz
Faculty of Informatics - Papers (Archive)
Multimedia is increasingly accessed online and within social networks; however, users are typically limited to visual/auditory stimulus through media presented onscreen with accompanying audio over speakers. Whilst recent research studying additional ambient sensory multimedia effects recorded numerical scores of perceptual quality, the users’ time-varying emotional response to the ambient sensory feedback is not considered. This paper thus introduces a framework to evaluate user ambient quality of multimedia experience and discover users’ time-varying emotional responses through explicit user tagging and implicit EEG biosignal analysis. In the proposed framework, users interact with the media via discrete tagging activities whilst their EEG biosignal …
Self-Matching Bands In The Paperfolding Sequence, Bruce Bates, Martin Bunder, Keith Tognetti
Self-Matching Bands In The Paperfolding Sequence, Bruce Bates, Martin Bunder, Keith Tognetti
Faculty of Informatics - Papers (Archive)
We compare term by term the paperfolding sequence with a copy displaced by d terms to obtain the matching fraction M(d).
Procedural Generation Of 3d Cave Models With Stalactites And Stalagmites, Juncheng Cui, Yang-Wai Chow, Minjie Zhang
Procedural Generation Of 3d Cave Models With Stalactites And Stalagmites, Juncheng Cui, Yang-Wai Chow, Minjie Zhang
Faculty of Informatics - Papers (Archive)
The increasing popularity of computer graphics applications in video games and movie production has resulted in a growing demand for the development of virtual environments with rich visual scene content. As such, the use of procedural content generation techniques is an attractive solution that can avoid the manual effort involved in the creation of highly complex scenes, by automating the generation of scene content. However, while there is much research on procedural content generation techniques, the procedural generation of 3D cave models is relatively unexplored. The focus of our research is on procedural cave generation, and this paper presents a …
Women In Ict: Guidelines For Evaluating Intervention Programmes, Annemieke Craig, Julie Fisher, Linda Dawson
Women In Ict: Guidelines For Evaluating Intervention Programmes, Annemieke Craig, Julie Fisher, Linda Dawson
Faculty of Informatics - Papers (Archive)
Many intervention programmes to increase the number of women in theInformation and Communications Technology (ICT) profession have been implemented over the last twenty years. Detailed evaluations help us to determine the effectiveness of these programmes yet few comprehensive evaluations appear in the literature.The research reported here describes an investigation of the evaluation of the intervention programmes focusing on increasing the enrolment and retention of females in ICT in Australia. This paper describes an empirical study which explores how evaluation has been and might be conducted and concludes with guidelines for evaluation for those developing programmes for increasing the participation of …
Real-Time Haptic Modeling And Simulation For Prosthetic Insertion, Catherine A. Todd, Fazel Naghdy
Real-Time Haptic Modeling And Simulation For Prosthetic Insertion, Catherine A. Todd, Fazel Naghdy
Faculty of Informatics - Papers (Archive)
In this work a surgical simulator is produced which enables a training otologist to conduct a virtual, real-time prosthetic insertion. The simulator provides the Ear, Nose and Throat surgeon with real-time visual and haptic responses during virtual cochlear implantation into a 3D model of the human Scala Tympani (ST). The parametric model is derived from measured data as published in the literature and accounts for human morphological variance, such as differences in cochlear shape, enabling patient-specific pre- operative assessment. Haptic modeling techniques use real physical data and insertion force measurements, to develop a force model which mimics the physical behavior …
Considering Cognitive Load Theory Within E-Learning Environments, Abdullah Al Asraj, Mark Freeman, Paul A. Chandler
Considering Cognitive Load Theory Within E-Learning Environments, Abdullah Al Asraj, Mark Freeman, Paul A. Chandler
Faculty of Informatics - Papers (Archive)
This study seeks to investigate how cognitive load influences knowledge construction and what is the role of layered integrated instructional techniques in facilitating the construction and automation of schemas whilst users are interacting with e-learning tools. Initially the literature on how Cognitive Load Theory (CLT) plays a role in e-learning tools is presented, this is followed by the considerations that need to be taken when developing e-learning tools with CLT as a focus so that learners can gain the best possible learning outcomes. This paper finally presents three different ways that e-learning tools can be designed when considering the cognitive …