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Faculty of Informatics - Papers (Archive)

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Articles 781 - 810 of 2013

Full-Text Articles in Physical Sciences and Mathematics

Sefap: An Email System For Anti-Phishing, Qoing Ren, Yi Mu, Willy Susilo Jul 2007

Sefap: An Email System For Anti-Phishing, Qoing Ren, Yi Mu, Willy Susilo

Faculty of Informatics - Papers (Archive)

More and more users are suffering from email-based phishing attacks over the past years. Despite the use of various technologies for anti-phishing, phishing is still one of most serious attacks against Internet users. Email phishing attacks fabricate the email’s origin. Unfortunately, current email server systems can not authenticate the genuineness of in-coming emails. In this paper, we present a novel antiphishing mechanism: Signed Email for Anti-Phishing (SEFAP), designed to automatically identify an email’s origin to mitigate email phishing attacks. The SEFAP system is an extendable secure cryptographic system that accommodates multiple signature schemes. SEFAP can adopt any signature scheme which …

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Minimizing Product Shrinkage Across The Supply Chain Using Radio Frequency Identification: A Case Study On A Major Australian Retailer, N. Huber, Katina Michael Jul 2007

Minimizing Product Shrinkage Across The Supply Chain Using Radio Frequency Identification: A Case Study On A Major Australian Retailer, N. Huber, Katina Michael

Faculty of Informatics - Papers (Archive)

This paper identifies the contributing factors of product shrinkage and investigates the current state of anti-theft technology as part of the loss prevention strategy for a major Australian retailer. Using a case study approach a total of eleven interviews were conducted with employees of the retailer to identify factors contributing to product shrinkage and ways to overcome these through the use of radio frequency identification (RFID) technology. Known sources of product shrinkage included: warehouse discrepancies, internal and external theft, product recalls, shop return fraud, extortion, human and system error, poor stock control, poor rotation of stock, misplaced product items, lost …

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Verifying Semantic Business Process Models In Inter-Operation, George Koliadis, Aditya Ghose Jul 2007

Verifying Semantic Business Process Models In Inter-Operation, George Koliadis, Aditya Ghose

Faculty of Informatics - Papers (Archive)

Process inter-operation is characterized as cooperative interactions among loosely coupled autonomous constituents to adaptively fulfill system-wide purpose. Issues of inconsistency can be anticipated in inter-operating processes given their independent management and design. To reduce inconsistency (that may contribute to failures) effective methods for statically verifying behavioral interoperability are required. This paper contributes a method for practical, semantic verification of interoperating processes (as represented with BPMN models). We provide methods to evaluate consistency during process design where annotation of the immediate effect of tasks and sub-processes has been provided. Furthermore, some guidelines are defined against common models of inter-operation for scoping …

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Beyond Mere Compliance Of Rfid Regulations By The Farming Community: A Case Study Of The Cochrane Dairy Farm, A. Trevarthen, Katina Michael Jul 2007

Beyond Mere Compliance Of Rfid Regulations By The Farming Community: A Case Study Of The Cochrane Dairy Farm, A. Trevarthen, Katina Michael

Faculty of Informatics - Papers (Archive)

Radio-frequency identification (RFID) is changing the face of livestock identification and management. Beyond satisfying the regulations of government agencies for livestock to be a part of a national identification system for tracking purposes, farmers are now considering venturing beyond mere basic compliance systems. Once installed, farmers have begun to realize that their initial capital investment into an RFID system holds great strategic potential. The initial outlay while substantial is a once only cost that with a few more application-centric uses can yield a return on investment manifold. This paper presents a case study of the Cochrane Dairy Farm situated on …

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Non-Scalar Economy: An Incentive-Based Approach For Managing Pollution And Attaining Economic Sustainability, Farzad Safaei Jul 2007

Non-Scalar Economy: An Incentive-Based Approach For Managing Pollution And Attaining Economic Sustainability, Farzad Safaei

Faculty of Informatics - Papers (Archive)

In the current economy, the cost of damage to the environment is often external, which is likely to lead to over-exploitation and inadequate provisioning. There are a variety of incentive-based schemes, such as effluent taxes or tradable permits, which attempt to confront the polluting agents with a ‘price’ equal to the marginal external cost of their activity. However, competitive incentives alone are not adequate for effective management of the shared resources. Thus, the current solutions exhibit several drawbacks including susceptibility to international free-riding, sensitivity to accurate estimation of cost of pollution or environmental targets, and inability to take the cumulative …

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Haptic Gaze-Tracking Based Perception Of Graphical User Interfaces, Simon Meers, Koren Ward Jul 2007

Haptic Gaze-Tracking Based Perception Of Graphical User Interfaces, Simon Meers, Koren Ward

Faculty of Informatics - Papers (Archive)

This paper presents a novel human-computer interface that enables the computer display to be perceived without any use of the eyes. Our system works by tracking the user's head position and orientation to obtain their 'gaze' point on a virtual screen, and by indicating to the user what object is present at the gaze location via haptic feedback to the fingers and synthetic speech or Braille text. This is achieved by using the haptic vibration frequency delivered to the fingers to indicate the type of screen object at the gaze position, and the vibration amplitude to indicate the screen object's …

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Parsimonious Classification Via Generalised Linear Mixed Models, G Kauermann, J. T. Ormerod, M P. Wand Jul 2007

Parsimonious Classification Via Generalised Linear Mixed Models, G Kauermann, J. T. Ormerod, M P. Wand

Faculty of Informatics - Papers (Archive)

We devise a classification algorithm based on generalized linear mixed model (GLMM) technology. The algorithm incorporates spline smoothing, additive model-type structures and model selection. For reasons of speed we employ the Laplace approximation, rather than Monte Carlo methods. Tests on real and simulated data show the algorithm to have good classification performance. Moreover, the resulting classifiers are generally interpretable and parsimonious.

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Quasi-Monte Carlo For Highly Structured Generalised Response Models, I. H. Sloan, F. Y. Kuo, W. T. Dunsmuir, M. Wand, R. S. Womersley Jul 2007

Quasi-Monte Carlo For Highly Structured Generalised Response Models, I. H. Sloan, F. Y. Kuo, W. T. Dunsmuir, M. Wand, R. S. Womersley

Faculty of Informatics - Papers (Archive)

Highly structured generalised response models, such as generalised linear mixed models and generalised linear models for time series regression, have become an indispensable vehicle for data analysis and inference in many areas of application. However, their use in practice is hindered by high-dimensional intractable integrals. Quasi-Monte Carlo (QMC) is a dynamic research area in the general problem of high-dimensional numerical integration, although its potential for statistical applications is yet to be fully explored. We survey recent research in QMC, particularly lattice rules, and report on its application to highly structured generalised response models. New challenges for QMC are identified and …

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Mqf: An Xml Based Multimedia Query Format, Kevin Adistambha, C. H. Ritz, I. S. Burnett Jul 2007

Mqf: An Xml Based Multimedia Query Format, Kevin Adistambha, C. H. Ritz, I. S. Burnett

Faculty of Informatics - Papers (Archive)

MQF is a new XML based format designed to facilitate communication between disparate systems for applications involving multimedia query by content. Currently no standardized protocol exists which are able to provide flexibility in formulation of a query, such as the combination of any multimedia format (image, video, sound) to serve as query terms, combined with very complicated query conditions that can utilize a hierarchy of meta-search engines. In this work, we propose MQF as a flexible solution to serve as a communication format between a client and server for use in content based multimedia searching.

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Knowledge Sharing And Organizational Change In A Leading Telecommunications Equipment Vendor: A Case Study On Southern Networks, Katina Michael Jul 2007

Knowledge Sharing And Organizational Change In A Leading Telecommunications Equipment Vendor: A Case Study On Southern Networks, Katina Michael

Faculty of Informatics - Papers (Archive)

In 1999 Southern Networks deployed the Open Text Livelink knowledge management system (KMS). Livelink allowed for the centralization of key corporate applications and associated content at a global, regional, line-of-business, departmental and personal level. Prior to the implementation of Livelink on an enterprise scale, the corporation’s 94,500 employees relied on fragmented departmental web pages which were scattered across eleven different Web servers making the task of finding information very difficult. This paper describes how the process of knowledge transfer at Southern Networks changed with the deployment of Livelink and how it enabled the automation of workflows through the company’s Web-based …

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A Pyramidal Neural Network For Visual Pattern Recognition, Son Lam Phung, A. Bouzerdoum Jul 2007

A Pyramidal Neural Network For Visual Pattern Recognition, Son Lam Phung, A. Bouzerdoum

Faculty of Informatics - Papers (Archive)

In this paper, we propose a new neural architecture for classification of visual patterns that is motivated by the two concepts of image pyramids and local receptive fields. The new architecture, called pyramidal neural network (PyraNet), has a hierarchical structure with two types of processing layers: Pyramidal layers and one-dimensional (1-D) layers. In the new network, nonlinear two-dimensional (2-D) neurons are trained to perform both image feature extraction and dimensionality reduction. We present and analyze five training methods for PyraNet [gradient descent (GD), gradient descent with momentum, resilient backpropagation (RPROP), Polak-Ribiere conjugate gradient (CG), and Levenberg-Marquadrt (LM)] and two choices …

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Use Of Personal Digital Assistants (Pdas) In Medical Education, Rattiporn Luanrattana, Khin Than Win, John Fulcher Jun 2007

Use Of Personal Digital Assistants (Pdas) In Medical Education, Rattiporn Luanrattana, Khin Than Win, John Fulcher

Faculty of Informatics - Papers (Archive)

A systematic review of how the personal digital assistants (PDAs) have been used in healthcare professions and medical education has been conducted in order to identify current usage of PDAs in both areas. The major aim of this research is to study the feasibility of incorporating PDAs into problem-based learning (PBL) medical education. A systematic review was conducted by exploring various databases on the use of PDAs in two major areas: the healthcare professions and medical education during the period 2000-2006. Results: The needs, patterns and functionalities of using PDAs in the medical profession have been identified and categorized into …

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An Investigation Into The Energy Efficiency Of Pure And Slotted Aloha Based Reid Anti-Collision Protocols, Dheeraj Klair, K. W. Chin, R. Raad Jun 2007

An Investigation Into The Energy Efficiency Of Pure And Slotted Aloha Based Reid Anti-Collision Protocols, Dheeraj Klair, K. W. Chin, R. Raad

Faculty of Informatics - Papers (Archive)

This paper investigates the energy efficiency of RFID anti-collision protocols and their suitability for use in RFID-enhanced wireless sensor networks (WSNs). We present a detailed analytical methodology and an in-depth qualitative and Aloha anti-collision protocols and their variants. We find that Slotted Aloha variants that employ muting with early-end are the most energy efficient, but are computationally expensive. Overall, for all Aloha variants we investigated, if the offered load is very high, tag responses cause a bottleneck at the reader. Thereby, resulting in no tags being identified and incur significant identification delays - thus severely impacting a sensor node's battery …

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A Fuzzy-Based Approach For Partner Selection In Multi-Agent Systems, Fenghui Ren, Minjie Zhang, Quan Bai Jun 2007

A Fuzzy-Based Approach For Partner Selection In Multi-Agent Systems, Fenghui Ren, Minjie Zhang, Quan Bai

Faculty of Informatics - Papers (Archive)

Traditional negotiation approaches pay intensive attention to decision making models in order to reach the optimal agreements, while placing insufficient efforts on the problem of partner selection. In this paper, a fuzzy-based approach for partner selection in multi-agent systems is proposed. By employing both the fuzzy logic and the extended dual concern model, agents can adapt their individual behaviors for partner selection in negotiation. The proposed approach has three merits, which are: (1) both the agent’s own benefit and its potential partners’ benefits are considered for partner selection in negotiation; (2) by employing the extended dual concern model, agents’ attitudes …

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E-Business Strategy And Firm Performance: A Latent Class Assessment Of The Drivers And Impediments To Success, T. R. Coltman, T.M. Devinney, D. F. Midgley Jun 2007

E-Business Strategy And Firm Performance: A Latent Class Assessment Of The Drivers And Impediments To Success, T. R. Coltman, T.M. Devinney, D. F. Midgley

Faculty of Informatics - Papers (Archive)

Among many leading organizations, in all sectors of industry, commerce and government, there is considerable evidence of e-business being deployed to achieve strategic goals. Where this deployment has been most successful, there is a strong case that the organization has taken an integrated approach that both builds on the organization's strengths and pays careful attention to the process of change within the organization. However, in the literature most empirical work has either studied e-business strategy and performance from the perspective of strategy content - which highlights positioning and/or unique bundles of resources - or from the perspective of strategy process …

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A Study Of Different Decoders For The New Rotation Spreading Matrix For Block Spread Ofdm In Uwb Channels, Ibrahim S. Raad, Xiaojing Huang, Darryn Lowe May 2007

A Study Of Different Decoders For The New Rotation Spreading Matrix For Block Spread Ofdm In Uwb Channels, Ibrahim S. Raad, Xiaojing Huang, Darryn Lowe

Faculty of Informatics - Papers (Archive)

This paper presents a study into different decoders for the new Rotation Spreading Matrix proposed for Block Spread OFDM (BSOFDM). It presents simulation results for the Maximum Likelihood (ML), Minimum Mean Square Error (MMSE), Zero Forcing (ZF), Maximal Ratio Combining (MRC) and Equal Gain Combining (EGC) decoders across the four IEEE defined Ultra-Wideband (UWB) channels CM1 to CM4. While it is well known that the ML decoder should theoretically outperform all the other decoders, practically due to its complexity it is not a viable option. It can be shown that MMSE, for BSOFDM with the proposed new Rotation Spreading Matrix, …

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Higher Order Rotation Spreading Matrix For Block Spread Ofdm, Ibrahim S. Raad, Xiaojing Huang, Darryn Lowe May 2007

Higher Order Rotation Spreading Matrix For Block Spread Ofdm, Ibrahim S. Raad, Xiaojing Huang, Darryn Lowe

Faculty of Informatics - Papers (Archive)

This paper continues the work on the new Rotation matrix developed for BSOFDM which showed improvement in frequency selective channels such as the UWB IEEE defined CM1 to CM4 and overall system performance. This paper presents a method by which higher order Rotation matrix can be derived and simulation results are used to show that the higher order Rotation matrix outperforms the Hadamard matrix in frequency selective channels.

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Multi-Channel Digital Fringe Calibration For Structured Light Profilometers Using Neural Networks, Matthew J. Baker, Jiangtao Xi, Joe F. Chicharo May 2007

Multi-Channel Digital Fringe Calibration For Structured Light Profilometers Using Neural Networks, Matthew J. Baker, Jiangtao Xi, Joe F. Chicharo

Faculty of Informatics - Papers (Archive)

The performance of structured light profilometers is significantly hindered by the generation of distorted sinusoid fringe images, particularly, for multi-channel applications. In this paper we investigate the application of neural network fringe calibration for the multi-channel approach. We analytically review the nature of the major error sources associated with the multi-channel approach and propose afringe calibration technique with emphasis on minimal photometric calibration. The performance of the calibration technique is gauged through both simulation and experimentation.

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Detecting People In Images: An Edge Density Approach, Son Lam Phung, A. Bouzerdoum Apr 2007

Detecting People In Images: An Edge Density Approach, Son Lam Phung, A. Bouzerdoum

Faculty of Informatics - Papers (Archive)

In this paper, we present a new method for detecting visual objects in digital images and video. The novelty of the proposed method is that it differentiates objects from non-objects using image edge characteristics. Our approach is based on a fast object detection method developed by Viola and Jones. While Viola and Jones use Harr-like features, we propose a new image feature - the edge density - that can be computed more efficiently. When applied to the problem of detecting people and pedestrians in images, the new feature shows a very good discriminative capability compared to the Harr-like features.

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Principles And Analysis Of The Squeezing Approach To Low Bit Rate Spatial Audio Coding, B. Cheng, C. H. Ritz, I. Burnett Apr 2007

Principles And Analysis Of The Squeezing Approach To Low Bit Rate Spatial Audio Coding, B. Cheng, C. H. Ritz, I. Burnett

Faculty of Informatics - Papers (Archive)

This paper presents a novel solution to multichannel spatial audio coding: spatial squeezing surround audio coding (S3AC). The S3AC scheme analyses a multichannel audio signal and downmixes it into a stereo signal pair containing both the monophonic properties of audio sources and their localization information; this avoids the need for side information. The approach uses time-frequency analysis of a spatial audio scene and exploits virtual sources and amplitude panning techniques to 'squeeze' 360deg of a horizontal soundfield to a 60deg stereo signal pair. In comparison with other spatial audio coding techniques, S3AC significantly advances …

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The Design Of A Tethered Aerial Robot, Phillip J. Mckerrow, D. Ratner Apr 2007

The Design Of A Tethered Aerial Robot, Phillip J. Mckerrow, D. Ratner

Faculty of Informatics - Papers (Archive)

This paper describes the design and modeling of a robot that swings on the end of a tether. Its height above the ground is controlled by the length of the tether. Its location on a spherical shell at the end of the tether is controlled by a pair of ducted fans. The vertical orientation of its body is determined by the point at which the horizontal thrust force acts relative to the centre of gravity (cog). The system acts like a double pendulum with two modes of natural movement. It is modeled with coordinate frames at the ends of the …

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Is That A Fish In Your Ear? A Universal Metalanguage For Multimedia, Joseph Thomas-Kerr, I. Burnett, C. H. Ritz, S. Devillers, D. De Schrijever, R. Van De Walle Apr 2007

Is That A Fish In Your Ear? A Universal Metalanguage For Multimedia, Joseph Thomas-Kerr, I. Burnett, C. H. Ritz, S. Devillers, D. De Schrijever, R. Van De Walle

Faculty of Informatics - Papers (Archive)

Universal Multimedia Access promises to adaptively deliver multimedia content to users according to their needs?whether it's their device, context, or preferences. Central to UMA is the development of metadata standards for describing multimedia resources to allow their adaptation. In this article, the authors report on the development of the Bitstream Syntax Description Language (BSDL) and describe applications for scalable content adaptation, format independent streaming, and delivery and configurable media coding.

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Soccer Robot Toy Within An Educational Environment, Peter James Vial, G. Serafini, I. Raad Mar 2007

Soccer Robot Toy Within An Educational Environment, Peter James Vial, G. Serafini, I. Raad

Faculty of Informatics - Papers (Archive)

Many autonomous robotic systems exist which are operated using battery powered subsystems. These systems typically suffer from short battery life, due in some part to the weight of the battery required to power them and the need for regular battery changes or recharges. This makes continuous operation difficult, which is desired for an embedded Internet system. A novel solution proposed here is to use a power cage in lieu of a battery, and limit the area the robot can traverse to the dimension of the cage. A prototype of such a system has been designed and successfully tested. The goal …

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A Study Of Different Angles For The New Spread Matrix For Bsofdm In Uwb Channels, Ibrahim S. Raad, Xiaojing Huang, Darryn Lowe Mar 2007

A Study Of Different Angles For The New Spread Matrix For Bsofdm In Uwb Channels, Ibrahim S. Raad, Xiaojing Huang, Darryn Lowe

Faculty of Informatics - Papers (Archive)

This paper presents a study into different angles for the New spread matrix developed for BSOFDM. It varies the angles for the matrix to develop different constellation schemes which are useful in overcoming the frequency selective channels which are encountered in mobile communication systems. Previously it has been discussed that this new matrix (the rotation matrix) has some advantages over Hadamard and the rotated Hadamard matrix in certain channels. This paper presents a study of varies angles with this new matrix over the UWB channels CM1 to CM4.

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Hybrid Automatic Repeat Requests For Mb-Ofdm Ultra-Wideband, Darryn Lowe, Xiaojing Huang Mar 2007

Hybrid Automatic Repeat Requests For Mb-Ofdm Ultra-Wideband, Darryn Lowe, Xiaojing Huang

Faculty of Informatics - Papers (Archive)

This paper analyzes the design and performance of hybrid automatic repeat request (HARQ) extensions to the multi-band orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) standard. It is shown how both Type-I and Type-III HARQ can significantly reduce the packet error rate (PER) in realistic frequency-selective channels. An exhaustive search is used to find an optimal low-complexity Type-III HARQ scheme by deriving the distance spectra and bit error upperbound for all sets of complementary puncturing matrices. The consequences of selecting sub-optimal puncturing matrices are also quantified.

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Adaptive Time-Frequency Codes For Ultra-Wideband, Darryn Lowe, Xiaojing Huang Mar 2007

Adaptive Time-Frequency Codes For Ultra-Wideband, Darryn Lowe, Xiaojing Huang

Faculty of Informatics - Papers (Archive)

This paper investigates inter-piconet interference (IPI) in the multi-band orthogonal frequency division multi-plexing (MB-OFDM) ultra-wideband (UWB) standard. IPI is caused when the time-frequency codes (TFCs) that delineate MB-OFDM piconets collide. An upper-bound on the severity of the IPI problem is obtained through a theoretical analysis of data-rate-specific punctured convolutional codes. Using these results, several methods for adaptive TFCs are proposed and analyzed. Comprehensive simulation results show how packet error rates (PERs) for simultaneous operating piconets (SOPs) can be improved by up to 2 dB by enabling adaptive TFCs at the transmitter. Several combinations of data rate, TFC, channel model and …

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Control, Trust, Privacy, And Security: Evaluating Location-Based Services, L. Perusco, Katina Michael Mar 2007

Control, Trust, Privacy, And Security: Evaluating Location-Based Services, L. Perusco, Katina Michael

Faculty of Informatics - Papers (Archive)

Location-based services (LBS) are those applications that utilize the position of an end-user, animal, or thing based on a given device (handheld, wearable, or implanted), for a particular purpose. This article uses scenario planning to identify the possible risks related to location-based services in the context of security and privacy. The original contribution of this article is that the dilemma has been related specifically to LBS, under the privacy-security dichotomy. Here, each side of the dichotomy is divided into three key components that combine to greatly magnify risk. Removing one or more components for each set decreases the privacy or …

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Consumer Electronics Control System Based On Hand Gesture Moment Invariants, Prashan Premaratne, Q. Nguyen Mar 2007

Consumer Electronics Control System Based On Hand Gesture Moment Invariants, Prashan Premaratne, Q. Nguyen

Faculty of Informatics - Papers (Archive)

Almost all consumer electronic equipment today uses remote controls for user interfaces. However, the variety of physical shapes and functional commands that each remote control features also raises numerous problems: the difficulties in locating the required remote control, the confusion with the button layout, the replacement issue and so on. The consumer electronics control system using hand gestures is a new innovative user interface that resolves the complications of using numerous remote controls for domestic appliances. Based on one unified set of hand gestures, this system interprets the user hand gestures into pre-defined commands to control one or many devices …

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Some New Results Of Regular Hadamard Matrices And Sbibd Ii, Tianbing Xia, Mingyuan Xia, Jennifer Seberry Feb 2007

Some New Results Of Regular Hadamard Matrices And Sbibd Ii, Tianbing Xia, Mingyuan Xia, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

In this paper we prove that there exist 4—{k2; ½k(k–1); k(k–2)} SDS, regular Hadamard matrices of order 4k2, and SBIBD (4k2, 2k2 + k, k2 + k) for k = 47, 71, 151, 167, 199, 263, 359, 439, 599, 631, 727, 919, 5q1, 5q2N, 7q3, where q1, q2 and q3 are prime power such that q1 ≡ 1(mod 4), q2 ≡ 5(mod 8) and q …

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The Quality Indicators Of Delivering E-Learning For Dementia Care To Nurses, Zhengyu Zhang, Ping Yu Jan 2007

The Quality Indicators Of Delivering E-Learning For Dementia Care To Nurses, Zhengyu Zhang, Ping Yu

Faculty of Informatics - Papers (Archive)

The inadequate supply of trained professionals to provide quality care for people with dementia is a big problem. Elearning could provide an effective solution to this challenge. Although e-learning is not a new teaching method, a quality framework is lack that can be used to judge the quality of e-learning delivery for working nurses. This gap thus should be overcomed. Therefore, the primary aim of this study is to identify the quality indicator for effective elearning delivery. Based on these indicators, a quality framework of e-learning packages that teach nurses to deliver dementia care is constructed. The approach taken is …

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