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University of Wollongong

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2004

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Extending Asterism Decoding To Qam And Its Complexity In Rician Fading Mimo Systems, P. Conder, Tadeusz A. Wysocki Dec 2004

Extending Asterism Decoding To Qam And Its Complexity In Rician Fading Mimo Systems, P. Conder, Tadeusz A. Wysocki

Faculty of Informatics - Papers (Archive)

The area of Multiple Input Multiple Output (MIMO) communications systems has received enormous attention recently as they can provide a roughly linear increase in data rate by using Multiple Transmit and Receive antennas. The optimal detection strategy for a MIMO receiver is to perform a Maximum-Likelihood (ML) search over all possible transmitted symbol combinations has an exponential complexity when the constellation size of number of transmit antennas increase. A number of sub-optimal decoders, such as VBLAST, provide linear decoding only where the number of receive antennas is at least equal to the number of transmit antennas . Asterism decoding proposed …

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Load-Balanced Route Discovery For Mobile Ad Hoc Networks, Mehran Abolhasan, Justin Lipman, Tadeusz A. Wysocki Dec 2004

Load-Balanced Route Discovery For Mobile Ad Hoc Networks, Mehran Abolhasan, Justin Lipman, Tadeusz A. Wysocki

Faculty of Informatics - Papers (Archive)

This paper presents Flow-Aware Routing Protocol (FARP), a new routing strategy designed to improve load balancing and scalability in mobile ad hoc networks. FARP is a hop-by-hop routing protocol, which introduces a flow-aware route discovery strategy to reduce the number of control overheads propagating through the network and distributes the flow of data through least congested nodes to balance the network traffic. FARP was implemented in Glomosim and compared with AODV. To investigate the load distribution capability of FARP new performance metrics were introduced to measure the data packet flow distribution capability of the each routing protocol. The simulation results …

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Observations On The Message Integrity Code In Ieee802.11wireless Lans, Jianyong Huang, Willy Susilo, Jennifer Seberry Dec 2004

Observations On The Message Integrity Code In Ieee802.11wireless Lans, Jianyong Huang, Willy Susilo, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

This paper surveys the security of the message integrity code used in the IEEE802.11 Wireless LANs. To address the security flaws of Wired Equivalent Privacy (WEP), the IEEE802.11i draft defines two data confidentiality and integrity protocols, Temporal Key Integrity Protocol (TKIP) and Counter-Mode-CBC-MAC Protocol (CCMP). TKIP is based on RC4, andCCMP is based on the AES cipher. TKIP includes a keyed hash functions, called Michael, as the messag integrity code. The aim of this paper is to summarise the recent research results of Michael and analyse the practicability of two attacks against Michael.

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Intranasal Vaccination With Streptococcal Fibronectin Binding Protein Sfb1 Fails To Prevent Growth And Dissemination Of Streptococcus Pyogenes In A Murine Skin Infection Model, Jason D. Mcarthur, E. Medina, J. Chin, B. J. Currie, K. S. Sriprakash, S. R. Talay, G. S. Chhatwal, Mark J. Walker Dec 2004

Intranasal Vaccination With Streptococcal Fibronectin Binding Protein Sfb1 Fails To Prevent Growth And Dissemination Of Streptococcus Pyogenes In A Murine Skin Infection Model, Jason D. Mcarthur, E. Medina, J. Chin, B. J. Currie, K. S. Sriprakash, S. R. Talay, G. S. Chhatwal, Mark J. Walker

Faculty of Science - Papers (Archive)

Fibronectin binding protein F1 (Sfb1) of Streptococcus pyogenes (group A streptococcus [GAS]) is a well-characterized adhesin that has been shown to induce protection in mice against a lethal intranasal GAS challenge after intranasal immunization with cholera toxin B subunit (CTB) as adjuvant. With a murine skin infection model, we have shown that Sfb1/CTB vaccination neither elicits opsonizing antibodies nor prevents systemic bacterial growth and dissemination to internal organs after a subcutaneous GAS challenge. These results indicate that an Sfb1-based vaccine should be complemented with additional protective antigens in order to be used in areas such as the tropical north of …

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A Study Of Umts Turbo Codes Across Space Time Spreading Channel With The Case Of M = 1 And M = 2, I. S. Raad, Peter James Vial, Tadeusz A. Wysocki Dec 2004

A Study Of Umts Turbo Codes Across Space Time Spreading Channel With The Case Of M = 1 And M = 2, I. S. Raad, Peter James Vial, Tadeusz A. Wysocki

Faculty of Informatics - Papers (Archive)

The study presented in this paper is that of Universal Mobile Telecommunications Systems (UMTS) Turbo Codes across Space Time Spreading channel with one transmitter antenna, one receiver (m = 1) and two transmitter antennas and one receiver (m = 2) to see to what extent the bit error rate (BER) can be improved. Using the Max-log decoding algorithm and 12 iterations it is shown in the simulation results that an extra 5 dB is achievable.

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Image Quality Assessment Using A Neural Network Approach, Abdesselam Bouzerdoum, A. Havstad, A. Beghdadi Dec 2004

Image Quality Assessment Using A Neural Network Approach, Abdesselam Bouzerdoum, A. Havstad, A. Beghdadi

Faculty of Informatics - Papers (Archive)

In this paper, we propose a neural network approach to image quality assessment. In particular, the neural network measures the quality of an image by predicting the mean opinion score (MOS) of human observers, using a set of key features extracted from the original and test images. Experimental results, using 352 JPEG/JPEG2000 compressed images, show that the neural network outputs correlate highly with the MOS scores, and therefore, the neural network can easily serve as a correlate to subjective image quality assessment. Using 10-fold cross-validation, the predicted MOS values have a linear correlation coefficient of 0.9744, a Spearman ranked correlation …

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Ontology Trend Analysis Of Dynamic Signals, David A. Stirling, P. Zulli Dec 2004

Ontology Trend Analysis Of Dynamic Signals, David A. Stirling, P. Zulli

Faculty of Informatics - Papers (Archive)

This paper describes a novel approach to analysing trends of a performance signal indicator from an industrial metallurgical reactor over a number of years of operation. Using a minimum message length algorithm, a detailed ontology of the signal behaviours or modalities was established. An abstraction of these yielded a number of related super states that in turn provided an insightful correspondence for the domain experts. Further detailed identification of the likely composition and causal influences contributing to each mode was subsequently induced with supervised learning.

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Distributed Range Assignment For Reliable Channel Access And Reuse In Ad-Hoc Networks, G. Srivastava, P. Boustead, Joe F. Chicharo Dec 2004

Distributed Range Assignment For Reliable Channel Access And Reuse In Ad-Hoc Networks, G. Srivastava, P. Boustead, Joe F. Chicharo

Faculty of Informatics - Papers (Archive)

The available bandwidth in an ad-hoc network can decrease rapidly due to the shared access to the communication channel. Power control can enhance the available bandwidth by allowing non-interfering nodes to communicate simultaneously. A number of power aware topology control algorithms have been proposed, where low power transmissions are used to forward duta. However, evaluating the power level for the data packets is not sufficient. Reliable transmission of the data packets in a shared channel network requires a number of signalling messages at the Medium Access Channel (MAC) layer. The trmsmission power of the signalling messages is crucial for both …

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Igniting Concern About Refugee Injustice, Sharon Callaghan, Brian Martin Dec 2004

Igniting Concern About Refugee Injustice, Sharon Callaghan, Brian Martin

Faculty of Arts - Papers (Archive)

Injustice is a prominent theme in the news but there is far less attention to how to be effective in opposing it. For activists, it is crucial to understand how reactions against injustice can be ignited and/or inhibited. Injustice towards refugees provides a revealing case study.

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Innovation-Export Linkages Within Different Cluster Models: A Case Study From The Australian Wine Industry , D. K. Aylward Dec 2004

Innovation-Export Linkages Within Different Cluster Models: A Case Study From The Australian Wine Industry , D. K. Aylward

Faculty of Commerce - Papers (Archive)

This paper examines innovation and export linkages within different levels of cluster development. The aim of the paper, using empirical data from the Australian wine industry, is to demonstrate that the association between innovation and export activity intensifies as the cluster develops. Dividing wine clusters into ‘innovative’ (highly developed) and ‘organised’ (less developed) models the paper uses selected core indicators of innovation and export activity to explore levels of integration within each model. This integration is examined in the context of Porter’s theory of ‘competitive advantage’, showing how these lessons can be translated to industry clusters in general.

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Technological Disadvantage Of The Digital Age, N. F. Johnson Dec 2004

Technological Disadvantage Of The Digital Age, N. F. Johnson

Faculty of Education - Papers (Archive)

Debates continue about the relative benefits, costs and risks of the diffusion of computer-based technologies throughout society and schooling. One area that has received considerable attention is gender equity. Early work on gender and computers focused on differences between male and female access and use (e.g. Huff, Fleming & Cooper, 1992; Kirkman, 1993; Morritt, 1997; Nelson & Cooper, 1997; Sofia, 1993), with concerns focused on the potential for girls to be disadvantaged. In some respects, it is arguable that problems of gender equity in schools with respect to computers have been overcome. For example, in a small study I conducted …

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Accuracy Limitations Introduced By Digital Projection Sources In Profilometric Optical Metrology Systems, Matthew J. Baker, Joe F. Chicharo, Jiangtao Xi, Enbang Li Dec 2004

Accuracy Limitations Introduced By Digital Projection Sources In Profilometric Optical Metrology Systems, Matthew J. Baker, Joe F. Chicharo, Jiangtao Xi, Enbang Li

Faculty of Informatics - Papers (Archive)

The accuracy of profilometric optical metrology systems utilising Digital Fringe Projection (DFP) is analysed. An analytical model to describe theoretical accuracy limitation is derived and given as a function of object distance from the projector, projector resolution, projection angle and also object gradient. Associated limitations of the model are also discussed and analysed. The validity of the new model is demonstrated through practical experimentation.

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Measuring Multiple Parameters In A Self-Mixing Optical Feedback System, Yanguang Yu, Jiangtao Xi, Enbang Li, Joe F. Chicharo, Thierry Bosch Dec 2004

Measuring Multiple Parameters In A Self-Mixing Optical Feedback System, Yanguang Yu, Jiangtao Xi, Enbang Li, Joe F. Chicharo, Thierry Bosch

Faculty of Informatics - Papers (Archive)

We propose a new approach that yields the values of multiple parameters at the same time for self-mixing optical feedback interferometric systems. These parameters are the linewidth enhancement factor of Semiconductor Lasers, the optical feedback level factor as well as vibration information of a target including the frequency and the amplitude. The method is based on optical feedback interferometry. Its effectiveness has been confirmed by computer simulations and experiments.

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From Sailor-Suits To Sadists: Lesbos Love As Reflected In Japan's Postwar "Perverse Press", Mark J. Mclelland Dec 2004

From Sailor-Suits To Sadists: Lesbos Love As Reflected In Japan's Postwar "Perverse Press", Mark J. Mclelland

Faculty of Arts - Papers (Archive)

This paper looks at a range of narratives positioning women's same-sex sexuality in the popular sexological press of the early postwar period in Japan.

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A Calibration Approach For Decoupling Colour Cross-Talk Using Nonlinear Blind Signal Separation Network, Y. Hu, Jiangtao Xi, Enbang Li, Joe F. Chicharo, Zongkai Yang, Yuanguang Yu Dec 2004

A Calibration Approach For Decoupling Colour Cross-Talk Using Nonlinear Blind Signal Separation Network, Y. Hu, Jiangtao Xi, Enbang Li, Joe F. Chicharo, Zongkai Yang, Yuanguang Yu

Faculty of Informatics - Papers (Archive)

We present a calibration approach to invert the nonlinear mixing process of colour cross-talk in multi-channel profilometry systems. Parameters of the inverse network are determined by a nonlinear blind signal separation algorithm. Experimental and simulation results demonstrate that proposed approach can effectively reduce colour leakages and improve the measurement accuracy.

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A Waterfall Model For Knowledge Management And Experience Management, Zhaohao Sun Dec 2004

A Waterfall Model For Knowledge Management And Experience Management, Zhaohao Sun

Faculty of Commerce - Papers (Archive)

This paper examines experience and knowledge, experience management (EM) and knowledge management (KM), and their interrelationships. It then proposes waterfall models for both EM and KM. The models characterize EM and KM as the integration of experience processing and corresponding management, that of knowledge processing and corresponding management respectively. The proposed approach facilitates research and development of KM, EM, and hybrid intelligent systems.

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Experience Based Reasoning For Recognising Fraud And Deception, Zhaohao Sun, G. Finnie Dec 2004

Experience Based Reasoning For Recognising Fraud And Deception, Zhaohao Sun, G. Finnie

Faculty of Commerce - Papers (Archive)

Fraud, deception and their recognition have received increasing attention in multiagent systems (MAS), e-commerce, and agent societies. However, little attention has been given to the theoretical foundation for fraud and deception from a logical viewpoint. We fill this gap by arguing that experience-based reasoning (EBR) is a logical foundation for recognizing fraud and deception. It provides a logical analysis of deception, which classifies recognition of deception into knowledge-based deception recognition, inference-based deception recognition, and hybrid deception recognition. It will examine the relationship between EBR and fraud as well as deception. It uses EBR to recognize fraud and deception in e-commerce …

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Marketing Research For Volunteering: A Research Agenda, Sara Dolnicar, Melanie J. Randle Dec 2004

Marketing Research For Volunteering: A Research Agenda, Sara Dolnicar, Melanie J. Randle

Faculty of Commerce - Papers (Archive)

Contributing an estimated AUD42 billion dollars a year to the Australian economy and US150 billion dollars to the USA, volunteering has become an industry sector of major importance. It has consequently attracted significant attention among researchers of various disciplines, including marketing. Nevertheless, the industry is confronted with ongoing challenges, particularly in the area of recruitment. This article provides a review of prior marketing-related studies and identifies a number of gaps in the research, such as a limitation in the past to a priori approaches to categorising volunteers, which has offered limited insight and conflicting results. The authors recommend a more …

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Integrating Information Literacy Into Curriculum Assessment Practice: An Informatics Case Study, Annette M. Meldrum, H. Tootell Dec 2004

Integrating Information Literacy Into Curriculum Assessment Practice: An Informatics Case Study, Annette M. Meldrum, H. Tootell

Senior Deputy Vice-Chancellor and Deputy Vice-Chancellor (Education) - Papers

This article describes how an Informatics subject has integrated information literacy skills into its curriculum assessment practice. The paper provides a background on the role information literacies have in student learning and explains the importance of ensuring the literacies are aligned with subject content and assessment practice. It describes the results of an informatics subject that has been developed through collaboration between Academic and Faculty Librarian.

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In Vivo Dosimetry And Seed Localization In Prostate Brachytherapy With Permanent Implants, Anatoly B. Rosenfeld, Dean Cutajar, M. L. Lerch, G. J. Takacs, T. Braddock, V. L. Perevertailo, J. Bucci, J. Kearsley, M. Zaider, M. Zelefsky Dec 2004

In Vivo Dosimetry And Seed Localization In Prostate Brachytherapy With Permanent Implants, Anatoly B. Rosenfeld, Dean Cutajar, M. L. Lerch, G. J. Takacs, T. Braddock, V. L. Perevertailo, J. Bucci, J. Kearsley, M. Zaider, M. Zelefsky

Faculty of Engineering - Papers (Archive)

This paper reports on the development of an interactive, intraoperative dose planning system for seed implant brachytherapy in cancer treatment. This system involves in vivo dosimetry and the ability to determine implanted seed positions. The first stage of this project is the development of a urethral alarm probe to measure the dose along the urethra during a prostate brachytherapy treatment procedure. Ultimately, the system will be used to advise the physicians upon reaching a preset dose rate or dose after total seed decay in the urethra during the seed placement. The second stage is the development of a method and …

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Ecrm Success And The Value Of Managerial Discretion. , T. Coltman, Sara Dolnicar Nov 2004

Ecrm Success And The Value Of Managerial Discretion. , T. Coltman, Sara Dolnicar

Faculty of Commerce - Papers (Archive)

The performance payoff from electronic customer relationship management (eCRM) programs has become a growing concern in marketing and information technology research and practice. Yet despite a number of research reports by both practitioners and academic institutions there remains little evidence of any robust relationship between eCRM investment and performance. Building on a surprisingly sparse literature regarding the importance of managerial discretion, we show that the beliefs held by managers’ matter. Three distinct types of firms populate our data, and the relationship between eCRM performance and its underlying determinants varies greatly between them. This is critical to strategic marketing because it …

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What Makes Students Attend Lectures? The Shift Towards Pragmatism In Undergraduate Lecture Attendance, Sara Dolnicar Nov 2004

What Makes Students Attend Lectures? The Shift Towards Pragmatism In Undergraduate Lecture Attendance, Sara Dolnicar

Faculty of Commerce - Papers (Archive)

An empirical study was conducted to gain understanding about reasons for lecture attendance among undergraduate students. Students were found to be heterogeneous regarding their reported lecture attendance motivations, with two segments representing prototypical extremes. The student group labelled “idealists” reported genuinely enjoying lectures and consisted of more mature aged students with working experience. Students labelled “pragmatics” were most highly represented in the Commerce Faculty, were among the younger students, reported attending lectures to get the information they need to succeed in the subject and demonstrated the lowest lecture attendance while achieving the highest grade point average. Generally, as opposed to …

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What Moves Which Volunteers To Donate Their Time? An Investigation Of Psychographic Heterogeneity Among Volunteers In Australia, Sara Dolnicar, Melanie J. Randle Nov 2004

What Moves Which Volunteers To Donate Their Time? An Investigation Of Psychographic Heterogeneity Among Volunteers In Australia, Sara Dolnicar, Melanie J. Randle

Faculty of Commerce - Papers (Archive)

Many local environmental volunteering organisations face difficulties attracting volunteers from specific subgroups of the community. Consequently, it is crucial to gain understanding about the variety of factors that move people to participate in environmental volunteering. Factors which might have been underestimated in the past given the rather homogeneous community groups of volunteers which are, e.g., predominantly of Anglo-Saxon origin. This study reports on an analysis of volunteering motivations based on a representative data set provided by the ABS. It reveals that volunteering motivations vary widely and illustrates possible new ways of marketing volunteering organisations in order to attract new community …

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Bottling Fog: Conjuring Up The Australian Km Standard, Helen M. Hasan Nov 2004

Bottling Fog: Conjuring Up The Australian Km Standard, Helen M. Hasan

Faculty of Commerce - Papers (Archive)

This paper tells the story of the development of the Australian Standard in Knowledge Management that is due for release at the end of 2004. It does this in the context of the nature of this Standard and with the knowledge of the lengthy and sometimes difficult process that was undertaken. It is hoped that this view of the Standard and its development will encourage its adoption and acceptance by the KM community.

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Why Do Dissatisfied Customers In The Business-To-Business Services Sector Stay With Their Existing Service Providers? An Exploratory Study, Venkata K. Yanamandram, L. White Nov 2004

Why Do Dissatisfied Customers In The Business-To-Business Services Sector Stay With Their Existing Service Providers? An Exploratory Study, Venkata K. Yanamandram, L. White

Faculty of Commerce - Papers (Archive)

There have been few studies that investigate the reasons that dissatisfied customers stay with service organisations. Further, there have been no studies that have investigated a range of factors simultaneously in a single model in the business services sector. This paper attempts to address this research gap. A qualitative study was conducted, with 17 personal interviews undertaken with managers who are involved in the choice of service providers. The results not only confirmed factors in the literature: switching costs, impact of alternative service providers, investment in relationships, service recovery and inertia, but also uncovered seven other factors: the service provider …

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Valuing Practice: The Place Of Practical Legal Research In Academic Life., K. F. Maxwell, J. Pastellas Nov 2004

Valuing Practice: The Place Of Practical Legal Research In Academic Life., K. F. Maxwell, J. Pastellas

Faculty of Law - Papers (Archive)

Practical legal training has traditionally been the poor relation of the legal education family. Along with the similarly placed clinical legal education, it is a latecomer to formal legal education and its academic value is regarded with some reservation by those involved in more mainstream areas of academia. These reservations are not entirely unfounded. While few could deny the value of practical legal training in terms of teaching and contribution to the legal community, it is in the contribution to research and scholarship that practical legal training may be seen to be less successful. Few academics who teach in practical …

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Calculation Of The Nonlinear Free-Carrier Absorption Of Terahertz Radiation In Semiconductor Heterostructures, C. Zhang, J. C. Cao Nov 2004

Calculation Of The Nonlinear Free-Carrier Absorption Of Terahertz Radiation In Semiconductor Heterostructures, C. Zhang, J. C. Cao

Faculty of Engineering - Papers (Archive)

Nonlinear absorption of terahertz waves by electrons in a semiconductor heterostructure is calculated. We solve the quantum transport equation for electrons strongly coupled to terahertz photons. The electrical field of the laser radiation is included exactly, and the electron-impurity interaction is included up to the second order. It is found that Joule heating of the electronic system due to impurity scattering decreases rapidly due to the strong electron-photon interaction. Our result is the dynamic equivalence of electron localization in a strong field. In the limit of weak radiation field, the current is linear in the field strength.

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Laboratory Determination Of Efficiency Of Prefabricated Vertical Drains Incorporating Vacuum Preloading, Buddhima Indraratna, Cholachat Rujikiatkamjorn Nov 2004

Laboratory Determination Of Efficiency Of Prefabricated Vertical Drains Incorporating Vacuum Preloading, Buddhima Indraratna, Cholachat Rujikiatkamjorn

Faculty of Engineering - Papers (Archive)

This paper is mainly concerned with a laboratory study to investigate the effect of vacuum preloading. Two separate series of tests were conducted in a large-scale consolidation apparatus designed and installed at the University of Wollongong, with axial load increments of 30 and 50 kPa. The first series of tests were performed based on the conventional method (i.e. without vacuum preloading). For the second series, a vacuum pressure of 100 kPa was applied during the process of consolidation. The corresponding settlement behaviour was recorded and plotted. The extent of smear zone was examined by the variation of permeability of small …

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Role Of Wavelet Transforms In Image Restoration, Prashan Premaratne, I. Burnett Nov 2004

Role Of Wavelet Transforms In Image Restoration, Prashan Premaratne, I. Burnett

Faculty of Informatics - Papers (Archive)

Image processing techniques including image restoration rely heavily on discrete Fourier transform (DFT) for frequency domain representation for analysis of its frequency content. Even though wavelet analysis has been around for more than a decade, much of its potential as a tool to analyze time-frequency localization of signal has not been properly tapped. In blind iterative deconvolution where a degraded image is restored with minimum a priori information about the original image or the point spread function (PSF), it is almost impossible to evaluate whether a restoration is achieved or not without human observation. We propose a new approach using …

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Topology Control In Heterogeneous Ad-Hoc Networks, G. Srivastava, P. Boustead, Joe F. Chicharo Nov 2004

Topology Control In Heterogeneous Ad-Hoc Networks, G. Srivastava, P. Boustead, Joe F. Chicharo

Faculty of Informatics - Papers (Archive)

Topology control in an ad-hoc network can provide better spatial reuse of the wireless channel and conserve power. Topology construction and maintenance is a challenging issue. A number of distributed topology control algorithms have been proposed to remove the need of a centralised controller. Distributed algorithms such as location information no topology (LINT), location information link state topology (LILT) and mobile-grid (MG), aim to achieve overall network connectivity and low transmission range by maintaining a minimum node degree value. In the case of a non-uniform node distribution, maintaining a minimum node degree can unnecessarily partition a network. In this paper, …

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