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Faculty of Informatics - Papers (Archive)

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Articles 661 - 690 of 2013

Full-Text Articles in Physical Sciences and Mathematics

Construction Of Universal Designated-Verifier Signatures And Identity-Based Signatures From Standard Signatures, Siamak Fayyaz Shahandashti, Reihaneh Safavi-Naini Jan 2008

Construction Of Universal Designated-Verifier Signatures And Identity-Based Signatures From Standard Signatures, Siamak Fayyaz Shahandashti, Reihaneh Safavi-Naini

Faculty of Informatics - Papers (Archive)

We give a generic construction for universal designated-verifier signature schemes from a large class, C, of signature schemes. The resulting schemes are efficient and have two important properties. Firstly, they are provably DV-unforgeable, non-transferable and also non-delegatable. Secondly, the signer and the designated verifier can independently choose their cryptographic settings. We also propose a generic construction for identity-based signature schemes from any signature scheme in C and prove that the construction is secure against adaptive chosen message and identity attacks. We discuss possible extensions of our constructions to universal multi-designated-verifier signatures, hierarchical identity-based signatures, identity-based universal designated verifier signatures, and …

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Kinetic Analysis Of Oleic Acid Esterification Using Lipolytic Enzyme As Catalyst, Mohd S. Mahmud, James W. Ryan, Cyrus Cooper, Tomasz Safinski, Mark I. Nelson, Harvinder S. Sidhu, Soji A. Adesina Jan 2008

Kinetic Analysis Of Oleic Acid Esterification Using Lipolytic Enzyme As Catalyst, Mohd S. Mahmud, James W. Ryan, Cyrus Cooper, Tomasz Safinski, Mark I. Nelson, Harvinder S. Sidhu, Soji A. Adesina

Faculty of Informatics - Papers (Archive)

This paper deals with the esterification kinetics of oleic acid (OA) using ethanol (EtOH) over acrylic-supported lipase from Aspergillus niger (Novozym 435) as catalyst. The reaction was carried out in a stirred 500 mL Pyrex glass reactor at 45oC under conditions with negligible external and internal transport resistances. Reaction runs in a microaqueous medium employed OA: EtOH ratio, b, between 0.01 to 2.0 without initial addition of water. The rate dependency on reactant concentration has a maximum at b=0.9, just below the stoichiometric ratio, and was therefore described by a Michaelis- Menten kinetic expression implicating irreversible surface reaction between adsorbed …

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Adaptive Independence Samplers, Jonathan M. Keith, Dirk P. Kroese, Georgy Sofronov Jan 2008

Adaptive Independence Samplers, Jonathan M. Keith, Dirk P. Kroese, Georgy Sofronov

Faculty of Informatics - Papers (Archive)

Markov chainMonte Carlo (MCMC) is an importantcomputational technique for generating samples fromnon-standard probability distributions. A major challenge inthe design of practical MCMC samplers is to achieve efficientconvergence and mixing properties. One way to accelerateconvergence and mixing is to adapt the proposaldistribution in light of previously sampled points, thus increasingthe probability of acceptance. In this paper, we proposetwo new adaptive MCMC algorithms based on the IndependentMetropolisHastings algorithm. In the first, weadjust the proposal to minimize an estimate of the crossentropybetween the target and proposal distributions, usingthe experience of pre-runs. This approach provides a generaltechnique for deriving natural adaptive formulae. The secondapproach …

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A Diagrammatic Reasoning System For The Description Logic Alc, Peter W. Eklund, Frithjof Dau Jan 2008

A Diagrammatic Reasoning System For The Description Logic Alc, Peter W. Eklund, Frithjof Dau

Faculty of Informatics - Papers (Archive)

Diagrammatic reasoning is a tradition of visual logic that allows sentences that are equivalent to first order logic to be written in a visual or structural form: usually for improved usability. A calculus for the diagram can then be defined that allows well-formed formulas to be derived. This calculus is intended in the analog of logical inference. Description logics (DLs) have become a popular knowledge representation and processing language. DLs correspond to decidable fragments of first order logic; their notation is in the style of symbolic, variable-free formulas. Moreover, DLs are equipped with table au theorem provers that are proven …

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Conditions For The Assessment Of The Harmonic Compliance Of An Installation, Timothy J. Browne, Sarath Perera, Victor J. Gosbell Jan 2008

Conditions For The Assessment Of The Harmonic Compliance Of An Installation, Timothy J. Browne, Sarath Perera, Victor J. Gosbell

Faculty of Informatics - Papers (Archive)

Methods of allocating harmonic emission limits to customer installations have evolved considerably, as evidenced by the development of harmonic guides such as IEEE-519 and IEC/TR 61000-3-6. However, there is only limited consensus on appropriate techniques validating compliance of installations with those limits. Existing techniques are reviewed and related problems are examined. Conditions which acceptable tests of compliance should meet are proposed.

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Higher Order Parallel Concatenated Spreading Matrices Ofdm, Xiaojing Huang, Ibrahim Raad Jan 2008

Higher Order Parallel Concatenated Spreading Matrices Ofdm, Xiaojing Huang, Ibrahim Raad

Faculty of Informatics - Papers (Archive)

This paper studies higher order parallel concatenated spreading matrix OFDM (PCSM-OFDM). PCSM-OFDM was shown to greatly improve on the classic Block Spread OFDM, this paper continues the work on PCSM-OFDM and studies higher order in terms of an increased number of streams. This shows that with the increase in the streams the overall BER performance improves.

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A Provable Secure Id-Based Explicit Authenticated Key Agreement Protocol Without Random Oracles, Haibo Tian, Willy Susilo, Yang Ming, Yumin Wang Jan 2008

A Provable Secure Id-Based Explicit Authenticated Key Agreement Protocol Without Random Oracles, Haibo Tian, Willy Susilo, Yang Ming, Yumin Wang

Faculty of Informatics - Papers (Archive)

In this paper, we present an identity-based explicit authenticated key agreement protocol that is provably secure without random oracles. The protocol employs a new method to isolate a session key from key con¯rmation keys so that there is no direct usage of hash functions in the protocol. The protocol is proved secure without random oracles in a variant of Bellare and Rogaway style model, an exception to current proof method in this style model in the ID-based setting. We believe that this key isolation method is novel and can be further studied for constructing more e±cient protocols.

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Performance Evaluation Of Ethanol Production Through Continuous Fermentation, Harvinder S. Sidhu, John M. Kavanagh, Simon D. Watt, Mark I. Nelson Jan 2008

Performance Evaluation Of Ethanol Production Through Continuous Fermentation, Harvinder S. Sidhu, John M. Kavanagh, Simon D. Watt, Mark I. Nelson

Faculty of Informatics - Papers (Archive)

We investigate the production of ethanol through continuous fermentation using Saccharomyces cerevisiae in a single reactor and cascades of two or three reactors. We use path following methods to investigate how the ethanol yield varies with the residence time in each reactor configuration of the cascade. Yields currently obtained in industry using yeast are approximately 0.48. We find reactor designs where the product yield approaches the stoichiometric limit of 0.51. We also estimate the financial benefits that can be achieved in typical US ethanol plants through increasing the product yield from 0.48 to 0.51.

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National Security And The Misology-Misanthropy Paradox Of Technology, George M. Mickhail Jan 2008

National Security And The Misology-Misanthropy Paradox Of Technology, George M. Mickhail

Faculty of Informatics - Papers (Archive)

The evolution of computing did not only result in the disengagement of thepopulace from its technological complexity, but also their submission to thedivine ability of 'scientists', who understand the mathematical complexityof information technologies. Socrates argued that both 'misanthropy' and'misology' stem from 'faith' placed in unreliable people and unsoundarguments. Such misplaced faith in surveillance technologies and theirprotractors, for example, often results in disengagement from debate, whichto Socrates was the antithesis to truth and wisdom. This paper explores howsociety is opting out of debate through the machinations of a neoconservativecredo that purports reason. Under the guise of freedom and democracy, suchdogma often …

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Study On Generalized Analysis Model For Fringe Pattern Profilometry, Y. Hu, Jiangtao Xi, Z. Yang, Enbang Li, Joe F. Chicharo Jan 2008

Study On Generalized Analysis Model For Fringe Pattern Profilometry, Y. Hu, Jiangtao Xi, Z. Yang, Enbang Li, Joe F. Chicharo

Faculty of Informatics - Papers (Archive)

This paper presents a generalized analysis model for fringe pattern profilometry. We mathematically derived a new analysis model that gives a more general expression of the relationship between projected and deformed fringe patterns. Meanwhile, based on the proposed generalized model, a new algorithm is presented to retrieve 3-D surfaces from nonlinearly distorted fringes.Without any prior knowledge about the projection system, we still can obtain very accurate measurement results by using a generalized analysis model and a proposed algorithm. Computer simulation and experimental results show that the generalized model and the proposed algorithm can significantly improve the 3-D reconstruction precision, especially …

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Carbon-Centric Computing: It Solutions For Climate Change, Aditya K. Ghose, Helen M. Hasan, T. Spedding Jan 2008

Carbon-Centric Computing: It Solutions For Climate Change, Aditya K. Ghose, Helen M. Hasan, T. Spedding

Faculty of Informatics - Papers (Archive)

IT has a role to play in the current debate on climate change. The current discourse on IT and climate change views IT in a negative light, as a polluter. What remains unrecognized is the critical role of IT as a source of solutions to the climate change problem. We live in a massive, inter-connected Planet Earth Supply Chain. IT provides a range of tools to model, manage and optimize this supply chain. The University of Wollongong Carbon-Centric Computing Initiative (CCCI) seeks to seed a program of research that addresses the climate change problem with a range of computing technologies …

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Joining A Carbon Nanotube And A Graphene Sheet, D. Baowan, B. J. Cox, James M. Hill Jan 2008

Joining A Carbon Nanotube And A Graphene Sheet, D. Baowan, B. J. Cox, James M. Hill

Faculty of Informatics - Papers (Archive)

This paper is a synopsis of the two least squares approaches developed in [1] for the perpendicular joining of a flat graphene sheet with a carbon nanotube. The two least squares approaches are the variation in the bond length and the variation in the bond angle. These are used to examine the joined structure of a zigzag (8,0) carbon nanotube with a flat graphene sheet. There are sixteen possible distinct defects corresponding to the number of atoms at the (8,0) tube open end, and therefore, in total sixteen joining structures need to be investigated. Moreover, the polygons that occur at …

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Carbon Molecules Oscillating In Carbon Nanotube Bundles, Ngamta Thamwattana, B. J. Cox, James M. Hill Jan 2008

Carbon Molecules Oscillating In Carbon Nanotube Bundles, Ngamta Thamwattana, B. J. Cox, James M. Hill

Faculty of Informatics - Papers (Archive)

Fullerenes C60 and carbon nanotubes are of considerable interest to researchers from many scientific areas due to their unique electronic and mechanical properties. One application of these carbon nanostructures that has recently attracted much attention is the creation of an oscillator that operates in the gigahertz range frequency. A number of studies have found that the sliding of the inner-shell inside the outershell of a multi-walled carbon nanotube can generate gigahertz oscillatory frequencies. In this paper, we investigate the mechanics of a gigahertz oscillator comprising a carbon nanotube oscillating within the centre of a uniform concentric ring or bundle …

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Robotic Machining From Programming To Process Control, Zengxi Pan, H. Zhang Jan 2008

Robotic Machining From Programming To Process Control, Zengxi Pan, H. Zhang

Faculty of Informatics - Papers (Archive)

This paper presents the critical issues and methodologies to improve robotic machining performance with industrial robots. A complete solution using active force control is introduced to address various issues arouse during the robotic machining process. Programming complex contour parts without a CAD model is made easy using force control functions such as lead-through and path-learning. The problem of process control is treated with a novel methodology that consists of real-time deformation compensation for quality and controlled material removal rate (CMRR) for process efficiency. Experimental results show that higher productivity as well as better surface quality can be achieved, indicating a …

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Supporting A Seamless Map In Peer-To-Peer System For Massively Multiplayer Online Role Playing Games, Xinbo Jiang, Farzad Safaei Jan 2008

Supporting A Seamless Map In Peer-To-Peer System For Massively Multiplayer Online Role Playing Games, Xinbo Jiang, Farzad Safaei

Faculty of Informatics - Papers (Archive)

Massively Multiplayer Online Role Playing Games feature huge maps that can be partitioned into smaller components called zones to achieve scalability. In peer-to-peer (P2P) systems, those zones can be assigned to peers who are willing to take up the role of zone servers. A seamless map requires inter-zone communications to allow interactions between players across zone boundaries. In assigning zones to peers, it is critical to seek approaches to reduce the inter-zone communication cost in P2P system. In this paper, we formulate the zone assignment problem for P2P system and demonstrate that the problem is NP-hard. We hence propose a …

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The Value Of Managerial Beliefs In Turbulent Environments: Managerial Orientation And E-Business Advantage, T. Coltman, T. M. Devinney, D. F. Midgley Jan 2008

The Value Of Managerial Beliefs In Turbulent Environments: Managerial Orientation And E-Business Advantage, T. Coltman, T. M. Devinney, D. F. Midgley

Faculty of Informatics - Papers (Archive)

There is a great divide between the degree to which academic research accounts for the role of managerial discretion in firm performance and the weight given by the popular press and financial community to the importance of the management of an organization. The purpose of this paper is to bridge this gap by quantifying the way managerial beliefs influence the quality of firm performance in a turbulent environment based on e-business.
An e-business research setting is used that is associated with a situation of environmental turbulence to allow for sufficient variance in managerial beliefs to measure their effect on firm …

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Efficient Supervised Learning With Reduced Training Exemplars, Giang H. Nguyen, A. Bouzerdoum, Son Lam Phung Jan 2008

Efficient Supervised Learning With Reduced Training Exemplars, Giang H. Nguyen, A. Bouzerdoum, Son Lam Phung

Faculty of Informatics - Papers (Archive)

In this article, we propose a new supervised learning approach for pattern classification applications involving large or imbalanced data sets. In this approach, a clustering technique is employed to reduce the original training set into a smaller set of representative training exemplars, represented by weighted cluster centers and their target outputs. Based on the proposed learning approach, two training algorithms are derived for feed-forward neural networks. These algorithms are implemented and tested on two pattern classification applications - skin detection and image classification. Experimental results show that with the proposed learning approach, it is possible to design networks in a …

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A Biologically Inspired Visual Pedestrian Detection System, Fok Hing Chi Tivive, Abdesselam Bouzerdoum Jan 2008

A Biologically Inspired Visual Pedestrian Detection System, Fok Hing Chi Tivive, Abdesselam Bouzerdoum

Faculty of Informatics - Papers (Archive)

In this paper, we present a biologically inspired method for detecting pedestrians in images. The method is based on a convolutional neural network architecture, which combines feature extraction and classification. The proposed network architecture is much simpler and easier to train than earlier versions. It differs from its predecessors in that the first processing layer consists of a set of pre-defined nonlinear derivative filters for computing gradient information. The subsequent processing layer has trainable shunting inhibitory feature detectors, which are used as inputs to a pattern classifier. The proposed pedestrian detection system is evaluated on the DaimlerChrysler pedestrian classification benchmark …

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In Pursuit Of A Sustainable Supply Chain: Insights From Westpac Banking Corporation, Byron W. Keating, A. Quazi, A. Kriz, T. Coltman Jan 2008

In Pursuit Of A Sustainable Supply Chain: Insights From Westpac Banking Corporation, Byron W. Keating, A. Quazi, A. Kriz, T. Coltman

Faculty of Informatics - Papers (Archive)

The aim of this paper is to provide clues to industry and academia on how best to approach the challenge of developing a sustainable supply chain. A case study was undertaken of the Westpac Banking Corporation – one of the world's most socially responsible banks – to examine how they approached the challenge of managing corporate social responsibility (CSR) in their supply chain. This paper highlights some of the challenges and opportunities associated with extending corporate governance beyond the firm boundary. Specific attention is given to a discussion of assessment and governance tools. The use of a single case study …

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A Carbon Atom Orbiting Around The Outside Of A Carbon Nanotube, Y. Chan, G. M. Cox, James M. Hill Jan 2008

A Carbon Atom Orbiting Around The Outside Of A Carbon Nanotube, Y. Chan, G. M. Cox, James M. Hill

Faculty of Informatics - Papers (Archive)

In this paper, we examine a carbon atom orbiting around the outside of a (6,6) carbon nanotube, where the orbiting phenomena is assumed to arise only from the van der Waals interactions between the carbon atom and the atoms on the surface of the carbon nanotube. We model the van der Waals forces utilizing the Lennard-Jones potential and assume that the carbon atoms are uniformly distributed over the surface of the carbon nanotube, so that a discrete sum of the atomic potential energy between the carbon atom and the molecule can be approximated by a line integral. The circular orbiting …

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Flicker Attenuation—Part Ii: Transfer Coefficients For Regular Voltage Fluctuations In Radial Power Systems With Induction Motor Loads, S. Tennakoon, S. Perera, D. Robinson Jan 2008

Flicker Attenuation—Part Ii: Transfer Coefficients For Regular Voltage Fluctuations In Radial Power Systems With Induction Motor Loads, S. Tennakoon, S. Perera, D. Robinson

Faculty of Informatics - Papers (Archive)

Electromagnetic compatibility standards and guidelines used for planning of flicker allocation at various busbars of a power system requires some knowledge of the manner in which voltage fluctuations and hence the flicker propagate and how various loads respond to them. The current rudimentary approach taken for the determination of the load response to voltage fluctuations is based on network impedance values and hypothetical dynamic impedance values of the connected loads. Practical results and recently developed theory on the subsynchronous behavior of induction machines suggest that where there is a large base of induction machine exists on a power system the …

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Managing Ethics In The Tourism Supply Chain: The Case Of Chinese Travel To Australia, Byron W. Keating Jan 2008

Managing Ethics In The Tourism Supply Chain: The Case Of Chinese Travel To Australia, Byron W. Keating

Faculty of Informatics - Papers (Archive)

The purpose of this paper was to provide clues to the industry and the academia on how best to approach the challenge of managing ethics in the tourism supply chain. To achieve this objective, the paper provided a case study of how the Australian government has responded to concerns about unethical practices in the tourism supply chain from China to Australia. A series of best practice recommendations are provided following a review of both the demand side and the supply side processes.

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From Automatic Identification And Data Capture (Aidc) To “Smart Business Process”: Preparing For A Pilot Integrating Rfid, S. F. Wamba, E. Lefebvre, Y. Bendavid, L.. A. Lefebvre Jan 2008

From Automatic Identification And Data Capture (Aidc) To “Smart Business Process”: Preparing For A Pilot Integrating Rfid, S. F. Wamba, E. Lefebvre, Y. Bendavid, L.. A. Lefebvre

Faculty of Informatics - Papers (Archive)

This paper examines the underlying logic behind the rules configured in a RFID middleware to support “smart business processes” in one retail supply chain. Through a detailed investigation of the underlying business processes, we will demonstrate how businesses rules can be defined, configured and refined in a RFID middleware. The results confirm that RFID technology is not a “Plug and Play” solution. RFID middleware configuration will require a high level of customization. Finally, this study allows the improvement of our understanding of the real potential of RFID technology in the supply chain context.

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Simple, Robust And Accurate Head-Pose Tracking Using A Single Camera, S. Meers, Koren Ward, I. Piper Jan 2008

Simple, Robust And Accurate Head-Pose Tracking Using A Single Camera, S. Meers, Koren Ward, I. Piper

Faculty of Informatics - Papers (Archive)

This paper describes an inexpensive, robust method for tracking the head position and orientation of the user by using a single low-cost USB camera and infrared light emitting diodes concealed within spectacle frames worn by the user. Unlike gaze and head-pose tracking systems which rely on high-resolution stereo cameras and complex image processing hardware and software to find and track facial features on the user, the proposed system is able to efficiently locate and track the head's orientation and distance relative to the camera with little processing. Due to the infrared light emitting diodes having fixed geometry, the system does …

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East Coast Mainline Rail Track: Options For 2014, Philip G. Laird Jan 2008

East Coast Mainline Rail Track: Options For 2014, Philip G. Laird

Faculty of Informatics - Papers (Archive)

The alignment of the track linking Melbourne, Sydney, Brisbane and Cairns is outlined, along with the current North - South interstate rail upgrade, and the former Queensland MainLine Upgrade. Summaries are given of the 2006 - 07 draft AusLink Corridor Strategies for each corridor along with the ongoing upgrading of the Hume, Pacific and Bruce Highways. Comment is made on track straightening and other upgrading options for each corridor. Such upgrades during 2009 - 2014 would lower transport costs and assist rail to reach a target of 50 per cent mode share on the East Coast (as opposed to less …

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Online Trust Mechanisms: A Domain Study Of Online Auctions, Glenn R. Bewsell Jan 2008

Online Trust Mechanisms: A Domain Study Of Online Auctions, Glenn R. Bewsell

Faculty of Informatics - Papers (Archive)

This research investigates mechanisms that impact trust at online auctions. A qualitative study is discussed within this paper to identify mechanisms that impact trust at online auctions. The mechanisms identified are discussed within normative and grounded theoretical approaches to trust. A result of this discussion I seek to answer the question: what factors do people perceive as important to increase online trust prior to an online transaction? This discussion will help professionals understand the factors that emerge from normative and grounded theoretical approaches to online trust research. A better understanding of online trust adds to the body of theory and …

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Cooperative Communication In Space-Time-Frequency Coded Mb-Ofdm Uwb, Le Chung Tran, Alfred Mertins, Tadeusz A. Wysocki Jan 2008

Cooperative Communication In Space-Time-Frequency Coded Mb-Ofdm Uwb, Le Chung Tran, Alfred Mertins, Tadeusz A. Wysocki

Faculty of Informatics - Papers (Archive)

Though cooperative communication has been intensively examined for general wireless systems, such as mobile and ad-hoc networks, it has been almost unexplored in the case of Space-Time-Frequency Coded Multi-band OFDM Ultra-Wideband (STFC MB-OFDM UWB). This paper proposes a framework of cooperative communication in such systems where nodes are equipped with only one antenna. Simulation results show that cooperative communication might, in some cases, provide better error performance than non-cooperative communication without any additional transmission power.

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Deafness In The Developing World: The Place Of Cochlear Implantation., M B Tarabichi, C Todd, Z Khan, X Yang, B Shehzad, M M Tarabichi Jan 2008

Deafness In The Developing World: The Place Of Cochlear Implantation., M B Tarabichi, C Todd, Z Khan, X Yang, B Shehzad, M M Tarabichi

Faculty of Informatics - Papers (Archive)

Introduction: This paper attempts to review changes in the lives of hearing-impaired patients within the developing world, brought about by globalisation and development. The paper also explores limitations to improved care and addresses the collective moral responsibility of developed nations. Methods: Analysis of literature. Results:Within developing nations, large populations have emerged with a similar pattern of problems, access to information and aspirations as those living in developed nations. However, marked differences in income have persisted. These trends have resulted in a relative increase in the proportion of the hearing-impaired population in need of cochlear implantation, while at the same time …

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Elimination Of Gamma Nonlinear Luminance Effects For Digital Video Projection Phase Measuring Profilometers, Matthew J. Baker, Jiangtao Xi, Joe F. Chicharo Jan 2008

Elimination Of Gamma Nonlinear Luminance Effects For Digital Video Projection Phase Measuring Profilometers, Matthew J. Baker, Jiangtao Xi, Joe F. Chicharo

Faculty of Informatics - Papers (Archive)

In this paper we are concerned with the elimination of gamma related errors by employing a simple and direct approach, specifically, for phase measuring profilometry (PMP) methods. The harmonic structure of a gamma distorted fringe is investigated and the implications of j for the PMP algorithm is studied. The minimum requirements in terms of number of Steps for appropriate elimination of j related phase residuals is identified and verified via both simulation and practical experimentation.

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Traceable And Retrievable Identity-Based Encryption, Man Ho Au, Qiong Huang, Joseph K. Liu, Willy Susilo, Duncan S. Wong, Guomin Yang Jan 2008

Traceable And Retrievable Identity-Based Encryption, Man Ho Au, Qiong Huang, Joseph K. Liu, Willy Susilo, Duncan S. Wong, Guomin Yang

Faculty of Informatics - Papers (Archive)

Very recently, the concept of Traceable Identity-based Encryption (IBE) scheme (or Accountable Authority Identity based Encryption scheme) was introduced in Crypto 2007. This concept enables some mechanisms to reduce the trust of a private key generator (PKG) in an IBE system. The aim of this paper is threefold. First, we discuss some subtleties in the first traceable IBE scheme in the Crypto 2007 paper. Second, we present an extension to this work by having the PKG’s master secret key retrieved automatically if more than one user secret key are released. This way, the user can produce a concrete proof of …

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