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Articles 1321 - 1350 of 2524

Full-Text Articles in Physical Sciences and Mathematics

The Acceptance Of A Clinical It Innovation By The Care Givers In Residential Aged Care 11-Weeks After The Software Implementation In Australia, Ping Yu, Hui Yu, Yi Mu Dec 2012

The Acceptance Of A Clinical It Innovation By The Care Givers In Residential Aged Care 11-Weeks After The Software Implementation In Australia, Ping Yu, Hui Yu, Yi Mu

Dr Ping Yu

End user acceptance and satisfaction with a new IT innovation is the pre-requisite for the successful introduction of this IT solutino into an organization. More than 70 per cent of health IT projects have failed to a certain extent because of its failure to satisfy the functional or non-functional requirements of the end users and thus were not accepted by them. To date, there is no sound evidence to suggest that clinical IT solutions will bring in benefits for a residential aged care facility. This is a real concern for aged care management in investment in clinical IT solutions in …

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Kernel Density Estimation Of Traffic Accidents In A Network Space, Zhixiao Xie, Jun Yan Dec 2012

Kernel Density Estimation Of Traffic Accidents In A Network Space, Zhixiao Xie, Jun Yan

Dr Jun Yan

A standard planar Kernel Density Estimation (KDE) aims to produce a smooth density surface of spatial point events over a 2-D geographic space. However, the planar KDE may not be suited for characterizing certain point events, such as traffic accidents, which usually occur inside a 1-D linear space, the roadway network. This paper presents a novel network KDE approach to estimating the density of such spatial point events. One key feature of the new approach is that the network space is represented with basic linear units of equal network length, termed lixel (linear pixel), and related network topology. The use …

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Towards Autonomous Service Level Agreement Negotiation For Adaptive Service Composition, Jun Yan, J. Zhang, J. Lin, M. Chhetri, S. Goh, R. Kowalczyk Dec 2012

Towards Autonomous Service Level Agreement Negotiation For Adaptive Service Composition, Jun Yan, J. Zhang, J. Lin, M. Chhetri, S. Goh, R. Kowalczyk

Dr Jun Yan

This paper reports innovative research aiming at supporting autonomous establishment and maintenance of service level agreements in order to guarantee end-to-end quality of service requirements for service composition provision. In this research, a set of interrelated service level agreements is established and maintained for a service composition, through autonomous agent negotiation. To enable this, an innovative framework is proposed in which agents on behalf of the service requestor and the service providers can negotiate service level agreements in a coordinated way. This framework also enables adaptive service level agreement re-negotiation in the dynamic and ever-changing service environment.

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Positive Semidefinite Metric Learning Using Boosting-Like Algorithms, Chunhua Shen, Junae Kim, Lei Wang, Anton Hengel Dec 2012

Positive Semidefinite Metric Learning Using Boosting-Like Algorithms, Chunhua Shen, Junae Kim, Lei Wang, Anton Hengel

Dr Lei Wang

The success of many machine learning and pattern recognition methods relies heavily upon the identification of an appropriate distance metric on the input data. It is often beneficial to learn such a metric from the input training data, instead of using a default one such as the Euclidean distance. In this work, we propose a boosting-based technique, termed BOOSTMETRIC, for learning a quadratic Mahalanobis distance metric. Learning a valid Mahalanobis distance metric requires enforcing the constraint that the matrix parameter to the metric remains positive semidefinite. Semidefinite programming is often used to enforce this constraint, but does not scale well …

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Computational Study Of Vibrational Qubits In Anharmonic Linear Ion Traps, Lei Wang Dec 2012

Computational Study Of Vibrational Qubits In Anharmonic Linear Ion Traps, Lei Wang

Dr Lei Wang

A string of cold ions confined in a linear trap represents a man-made quantum object with a broad range of applications in atomic and molecular spectroscopy, such as high-precision measurement of atomic properties. An efficient isolation from the environment guarantees excellent coherent properties of such systems and makes them suitable for practical realization of the quantum information processing. The pioneering theoretical [Cirac and Zoller] and experimental [Wineland and Monroe] work in 1990s resulted in the explosive expansion of this field during the last decade. In this dissertation an alternative new method for controlling the quantized motional/vibrational states of ions in …

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Considering Cognitive Load Theory Within E-Learning Environments, Abdullah Al Asraj, Mark Freeman, Paul Chandler Dec 2012

Considering Cognitive Load Theory Within E-Learning Environments, Abdullah Al Asraj, Mark Freeman, Paul Chandler

Dr Mark Freeman

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 …

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Mitagation Against Mai In A Space Time Spreading Software Defined Radio, Shinhan Wee, Montse Ros, Peter Vial Dec 2012

Mitagation Against Mai In A Space Time Spreading Software Defined Radio, Shinhan Wee, Montse Ros, Peter Vial

Dr Peter Vial

A Software Defined Radio test bed using the Gnu Radio project was installed on Unix boxes and modified so that estimates of the channel state coefficients were taken for a Multiple Input Multiple output (MIMO) system to take advantage of space time transmission at a frqeuency of 2.4GHz. This system was modified to provide a Space Time Spreading test bed. The test bed was modified so that multiple access interference was experienced by off-setting different users data streams. The Walsh-Hadamard and Wysocki (low correlation) spreading sequences were deployed in the test bed to compare their Bit Error Rate performance. We …

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Quasi-Orthogonal Space-Time-Frequency Codes In Mb-Ofdm Uwb, Le Chung Tran, Alfred Mertins, Tadeusz Wysocki Dec 2012

Quasi-Orthogonal Space-Time-Frequency Codes In Mb-Ofdm Uwb, Le Chung Tran, Alfred Mertins, Tadeusz Wysocki

Dr Le Chung Tran

Quasi-Orthogonal Space-Time-Frequency Codes (QOSTFCs) will be examined in this paper to advance either data rate or error performance in recently proposed Space-Time-Frequency Coded Multiband OFDM Ultra-Wideband (STFC MB-OFDM UWB) communication systems. It is shown that QOSTFCs can provide signi¯cantly better error performance, compared to the conventional MB-OFDM UWB (without STFCs) and to the Orthogonal STFCs (OSTFCs) of the same order, at the same data rate, without increasing the total transmission power. Another form of the enhancement would be that QOSTFCs can provide higher data rates with the same error performance, compared to OSTFCs.

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Novel Constructions Of Improved Square Complex Orthogonal Designs For Eight Transmit Antennas, Le Chung Tran, Alfred Mertins, Jennifer Seberry, Tadeusz Wysocki, Sarah Adams Dec 2012

Novel Constructions Of Improved Square Complex Orthogonal Designs For Eight Transmit Antennas, Le Chung Tran, Alfred Mertins, Jennifer Seberry, Tadeusz Wysocki, Sarah Adams

Dr Le Chung Tran

Constructions of square, maximum rate complex orthogonal space–time block codes (CO STBCs) are well known, however codes constructed via the known methods include numerous zeros, which impede their practical implementation. By modifying the Williamson and Wallis-Whiteman arrays to apply to complex matrices, we propose two methods of construction of square, order-4n CO STBCs from square, order-n codes which satisfy certain properties. Applying the proposed methods, we construct square, maximum rate, order-8 CO STBCs with no zeros, such that the transmitted symbols are equally dispersed through transmit antennas. Those codes, referred to as the improved square CO STBCs, have the advantages …

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Novel Constructions Of Improved Square Complex Orthogonal Designs For Eight Transmit Antennas, Le Chung Tran, Tadeusz Wysocki, Jennifer Seberry, Alfred Mertins, Sarah Adams Dec 2012

Novel Constructions Of Improved Square Complex Orthogonal Designs For Eight Transmit Antennas, Le Chung Tran, Tadeusz Wysocki, Jennifer Seberry, Alfred Mertins, Sarah Adams

Dr Le Chung Tran

Constructions of square, maximum rate complex orthogonal space-time block codes (CO STBCs) are well known, however codes constructed via the known methods include numerous zeros, which impede their practical implementation. By modifying the Williamson and Wallis-Whiteman arrays to apply to complex matrices, we propose two methods of construction of square, order-4n CO STBCs from square, order-n codes which satisfy certain properties. Applying the proposed methods, we construct square, maximum rate, order-8 CO STBCs with no zeros, such that the transmitted symbols are equally dispersed through transmit antennas. Those codes, referred to as the improved square CO STBCs, have the advantages …

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Differential Space-Time-Frequency Codes For Mb-Ofdm Uwb With Dual Carrier Modulation, Alfred Mertins, Le Chung Tran Dec 2012

Differential Space-Time-Frequency Codes For Mb-Ofdm Uwb With Dual Carrier Modulation, Alfred Mertins, Le Chung Tran

Dr Le Chung Tran

In a multiple-input multiple-output (MIMO) multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) system, coherent detection where the channel state information (CSI) is assumed to be exactly known at the receiver requires the transmission of a large number of symbols for channel estimation, thus reducing the bandwidth efficiency. This paper examines the use of unitary differential space-time frequency codes (DSTFCs) in MB-OFDM UWB, which increases the system bandwidth efficiency due to the fact that no CSI is required for differential detection. The proposed DSTFC MB-OFDM system would be useful when the transmission of multiple channel estimation symbols is impractical or …

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Humancentric Applications Of Rfid Chips, S. Derrick, K. Michael, H. Tootell Dec 2012

Humancentric Applications Of Rfid Chips, S. Derrick, K. Michael, H. Tootell

Dr Holly Tootell

No abstract provided.

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Understanding Ageing In Older Australians: The Contribution Of The Dynamic Analyses To Optimise Ageing (Dynopta) Project To The Evidence Base And Policy, Kaarin Anstey, Allison Blelak, Carole Birrell, Colette Browning, Richard Burns, Julie Byles, Kim Kiely, Binod Nepal, Lesley Ross, David Steel, Timothy Windsor Dec 2012

Understanding Ageing In Older Australians: The Contribution Of The Dynamic Analyses To Optimise Ageing (Dynopta) Project To The Evidence Base And Policy, Kaarin Anstey, Allison Blelak, Carole Birrell, Colette Browning, Richard Burns, Julie Byles, Kim Kiely, Binod Nepal, Lesley Ross, David Steel, Timothy Windsor

Professor David Steel

Aim:  To describe the Dynamic Analyses to Optimise Ageing (DYNOPTA) project and illustrate its contributions to understanding ageing through innovative methodology, and investigations on outcomes based on the project themes. DYNOPTA provides a platform and technical expertise that may be used to combine other national and international datasets. Methods:  The DYNOPTA project has pooled and harmonised data from nine Australian longitudinal studies to create the largest available longitudinal dataset (n= 50652) on ageing in Australia. Results:  A range of findings have resulted from the study to date, including methodological advances, prevalence rates of disease and disability, and mapping trajectories of …

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Crossed Products Of K-Graph C*-Algebras By Zl, Cyntyhia Farthing, David Pask, Aidan Sims Dec 2012

Crossed Products Of K-Graph C*-Algebras By Zl, Cyntyhia Farthing, David Pask, Aidan Sims

Professor Aidan Sims

An action of Zl by automorphisms of a k-graph induces an action of Zl by automorphisms of the corresponding k-graph C*-algebra. We show how to construct a (k + l)-graph whose C*-algebra coincides with the crossed product of the original k-graph C)-algebra by Zl. We then investigate the structure of the crossed-product C*-algebra.

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Towards Knowledge Management In Sports Event Management: Context Analysis Of Malaysian Biannual Games With Commonkads, Azizul Abdul Ghaffar, Ghassan Beydoun, Jun Shen, William Tibben Dec 2012

Towards Knowledge Management In Sports Event Management: Context Analysis Of Malaysian Biannual Games With Commonkads, Azizul Abdul Ghaffar, Ghassan Beydoun, Jun Shen, William Tibben

Dr Jun Shen

Context Analysis (CA) is typically used as an early phase preceding the development of a knowledge-based systems in order to indicate how the system should interact with its environment and the various stakeholders. We undertake a detailed context analysis of business processes of the Malaysian Games (MG)to highlight blind spots of the process and enable the identification of an initial sports event knowledge management (KM) framework. Firstly, our CommonKADS driven analysis highlights how we can improve the business process and enable the organization to develop, distribute and apply its knowledge resources effectively. Secondly, the paper highlights specific features about the …

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Qos-Aware Service Selection In P2p-Based Business Process Frameworks, S. Yuan, J. Shen Dec 2012

Qos-Aware Service Selection In P2p-Based Business Process Frameworks, S. Yuan, J. Shen

Dr Jun Shen

With the advances and evolution of semantic Web services, service providers need to be more competitive, efficient, flexible, and integrated in the service network at different scenarios, including static and dynamic deployments and interactions. Recently, OWL-S and QoS-aware services have been distinguished due to their significance and their impact on decentralised network. JXTA and BPEL allow peers to cooperate and automate business processes and reengineer their structure, so as to rationally select and make use of all resource in decentralised environment; in addition, they increase efficiency and reduce costs. We incorporated several typical constraints to testify the possibility of the …

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Besov-Spaces On Domains In Rd, Ronald Devore, Robert Sharpley Dec 2012

Besov-Spaces On Domains In Rd, Ronald Devore, Robert Sharpley

Robert Sharpley

No abstract provided.

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On The Differentiability Of Functions In Rn, Ronald Devore, Robert Sharpley Dec 2012

On The Differentiability Of Functions In Rn, Ronald Devore, Robert Sharpley

Robert Sharpley

No abstract provided.

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Cervical Cancer Classification Using Gabor Filters, - Rahmadwati, Golshah Naghdy, Montserrat Ros, Catherine Todd, Eviana Norahmawati Dec 2012

Cervical Cancer Classification Using Gabor Filters, - Rahmadwati, Golshah Naghdy, Montserrat Ros, Catherine Todd, Eviana Norahmawati

Dr Montserrat Ros

No abstract provided.

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Ultrafast Laser-Induced Damage And The Influence Of Spectral Effects, Jeremy Gulley Nov 2012

Ultrafast Laser-Induced Damage And The Influence Of Spectral Effects, Jeremy Gulley

Jeremy R. Gulley

Numerous studies have investigated the prerequisite role of photoionization in ultrafast laser-induced damage (LID) of bulk dielectrics. This study examines the role of spectral width and instantaneous laser frequency in LID using a frequency dependent multiphoton ionization (MPI) model and numerical simulation of initially 800 nm laser pulses propagating through fused silica. Assuming a band gap of 9 eV, MPI by an 800 nm field is a six-photon process, but when the instantaneous wavelength is greater than 827 nm an additional photon is required for photoionization, reducing the probability of the event by many orders of magnitude. Simulation results suggest …

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Retailing Nears Holy Grail In 'Big Data', Jennifer Priestley Nov 2012

Retailing Nears Holy Grail In 'Big Data', Jennifer Priestley

Jennifer L. Priestley

(First paragraph) Yesterday I was online looking for a red, cotton wrap skirt, size 6 (OK, maybe size 8). After viewing several different retail sites, clicking through countless options, I found the perfect skirt. But I had to “abandon” my cart to take care of a minor household crisis. When I went back online, it seemed as if every ad included size 6 women, wearing red wrap skirts. Even more interesting, most came with an incentive for free shipping or 10 percent off.

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Hecke Algebras Of Group Extensions, Udo Baumgartner, James Foster, Jacqui Hicks, Helen Lindsay, Benjamin Maloney, Iain Raeburn, Jacqueline Ramagge, Sarah Richardson Nov 2012

Hecke Algebras Of Group Extensions, Udo Baumgartner, James Foster, Jacqui Hicks, Helen Lindsay, Benjamin Maloney, Iain Raeburn, Jacqueline Ramagge, Sarah Richardson

Professor Jacqui Ramagge

We describe the Hecke algebra (Γ,Γ0) of a Hecke pair (Γ,Γ0) in terms of the Hecke pair (N,Γ0) where N is a normal subgroup of Γ containing Γ0. To do this, we introduce twisted crossed products of unital *-algebras by semigroups. Then, provided a certain semigroup S Γ/N satisfies S −1 S = Γ/N, we show that (Γ,Γ0) is the twisted crossed product of (N,Γ0) by S. This generalizes a recent theorem of Laca and Larsen about Hecke algebras of semidirect products.

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Posets And Differential Graded Algebras, Jacqueline Ramagge, Wayne Wheeler Nov 2012

Posets And Differential Graded Algebras, Jacqueline Ramagge, Wayne Wheeler

Professor Jacqui Ramagge

If P is a partially ordered set and R is a commutative ring, then a certain differential graded /f-algebra A,(P) is defined from the order relation on P. The algebra A.(Vi) corresponding to the empty poset is always contained in A.(P) so that A,(P) can be regarded as an /4.(0)-algebra. The main result of this paper shows that if R is an integral domain and P and P' are finite posets such that A.(P) = A.(P') as differential graded /4,(0)-algebras, then P and P' are isomorphic. 1991 Mathematics subject classification (Amer. Math. Soc): primary 06A06.

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Affine Kac-Moody Groups Of Types Ii And Iii, Jacqueline Ramagge Nov 2012

Affine Kac-Moody Groups Of Types Ii And Iii, Jacqueline Ramagge

Professor Jacqui Ramagge

We announce a theorum which states that, over certain fields, affine Kac-Moody groups of types II and III arise as the fixed point subgroups under particular automorphism of affine Kac_moody groups obtained from a simply laced extended Cartan matrices (and hence of type I) of higher rank. Thus our result extends a theorum on Kac-Moody algebras to corresponding groups. A detailed proof of this result will appear in the J. Algebra.

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On Certain Fixed Point Subgroups Of Affine Kac-Moody Groups, Jacqueline Ramagge Nov 2012

On Certain Fixed Point Subgroups Of Affine Kac-Moody Groups, Jacqueline Ramagge

Professor Jacqui Ramagge

In this paper we give a detailed description of the fixed point subgroups of certain Kac-Moody groups under particular automorphisms. We consider Kac-Moody groups arising from simply laced extended Cartan matrices and their fixed point subgroups under automorphisms which contain a non-trivial field automorphism constituent as well as a non-trivial graph automorphism constituent. We show that such a situation satisfies all the conditions of a theorem of J-Y. Hée "Torsion de groupes munis dune donnée radicelle, Théorème (4.5)" which concludes that the fixed point subgroup has a B , N )-pair and a system of root subgroups. This paper contains …

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Triangle Buildings And Actions Of Type Iii 1/Q2, Jacqueline Ramagge, Guyan Robertson Nov 2012

Triangle Buildings And Actions Of Type Iii 1/Q2, Jacqueline Ramagge, Guyan Robertson

Professor Jacqui Ramagge

We study certain group actions on triangle buildings and their boundaries and some von Neumann algebras which can be constructed from them. In particular, for buildings of order q ≥ 3 certain natural actions on the boundary are hyperfinite of type III1/q2.

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When Does Qp Yield The Exact Solution To Constrained Nmpc?, José Mare, Jose De Dona, María Seron, Hernan Haimovich, Jacqueline Ramagge Nov 2012

When Does Qp Yield The Exact Solution To Constrained Nmpc?, José Mare, Jose De Dona, María Seron, Hernan Haimovich, Jacqueline Ramagge

Professor Jacqui Ramagge

It is well known that the optimal control sequence for a linear system with a quadratic cost and linear inequality constraints over a finite optimisation horizon can be computed by means of a quadratic programme (QP). The aim of this article is to investigate when the optimal control sequence for a non-linear single-input single-output system also can be computed via QP. Our main contribution is to show that the optimal control sequence for non-linear systems, with a quadratic cost and linear inequality constraints can be computed in exact form via QP provided the optimisation horizon is no larger than a …

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Cohomology Of Buildings And Finiteness Properties Of An-Groups, Jacqueline Ramagge, Wayne Wheeler Nov 2012

Cohomology Of Buildings And Finiteness Properties Of An-Groups, Jacqueline Ramagge, Wayne Wheeler

Professor Jacqui Ramagge

Borel and Serre calculated the cohomology of the building associated to a reductive group and used the result to deduce that torsion-free S-arithmetic groups are duality groups. By replacing their group-theoretic arguments with proofs relying only upon the geometry of buildings, we show that Borel and Serre's approach can be modied to calculate the cohomology of any locally nite ane building. As an application we show that any nitely presented e An-group is a virtual duality group. A number of other niteness conditions for e An-groups are also established.

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Simdrug: Tackling The Complexity Of Illicit Drug Markets In Australia, Pascal Perez, A Dray, Alison Ritter, Paul Dietze, T Moore, Lorraine Mazerolle Nov 2012

Simdrug: Tackling The Complexity Of Illicit Drug Markets In Australia, Pascal Perez, A Dray, Alison Ritter, Paul Dietze, T Moore, Lorraine Mazerolle

Professor Pascal Perez

Complexity of illicit drug markets mirrors the complexity of illicit drug use itself. The intricacy of multiple interactions between individuals, the various time lines linked to different aspects of harm reduction, and contrasted social rationalities observed among field practitioners (prevention, law enforcement, harm reduction) contribute to the creation of complex and unpredictable systems. In order to explore this complexity, an Agent-Based Model (ABM) called SimDrug was designed. The prototype model includes users, dealers, wholesalers, outreach workers and police forces. The model is focused upon local drug market and the hot spots in Melbourne. The time span for the model is …

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Primary And Secondary Indices For Power Quality (Pq) Survey Reporting, V. Gosbell, S. Perera, Robert Barr, Alex Baitch Nov 2012

Primary And Secondary Indices For Power Quality (Pq) Survey Reporting, V. Gosbell, S. Perera, Robert Barr, Alex Baitch

Associate Professor Sarath Perera

Routine monitoring involves many PQ monitors at fixed sites with readings able to be interrogated remotely and downloaded to a central database. The amount of data for one year is large, and innovative methods are needed to ensure that it can give useful insights. Primary indices are proposed to show whether a site is acceptable to specified standards and are mainly based on 95% values. Secondary indices are proposed to give additional insights. For variations, indices are proposed to give a measure of the impact on customer equipment beyond that incorporated in standards. Sag secondary indices are defined to give …

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