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Performance Analysis Of Multi-Ary Systems With Iterative Linear Minimum-Mean-Square-Error Detection, Li Ping, Jun Tong, Xiaojun Yuan, Qinghua Guo
Performance Analysis Of Multi-Ary Systems With Iterative Linear Minimum-Mean-Square-Error Detection, Li Ping, Jun Tong, Xiaojun Yuan, Qinghua Guo
Faculty of Engineering and Information Sciences - Papers: Part A
This paper is concerned with coded multi-ary systems over linear channels. Based on a semi-analytical evolution technique, the impact of signaling schemes on the performance of low-cost iterative linear minimum-mean-square-error (LMMSE) detection is studied. It is shown that superposition coded modulation (SCM) maximizes the output signal-to-noise ratio (SNR) of LMMSE detectors. Consequently, SCM may potentially outperform other conventional signaling schemes when LMMSE detectors are used. Numerical examples are provided to verify the theoretical analysis. © 2008 IEEE.
The Influence Of Perceived Credibility On Preferences For Recommender Systems As Sources Of Advice, Kyung Hyan Yoo, Ulrike Gretzel
The Influence Of Perceived Credibility On Preferences For Recommender Systems As Sources Of Advice, Kyung Hyan Yoo, Ulrike Gretzel
Faculty of Commerce - Papers (Archive)
Recommender systems promise to support travelers in complex decision-making processes; however, whether a recommendation is seen as credible advice and actually taken into account not only depends on travelers' perceptions of the recommendation but also of the system as the advice giver. A scale to measure recommender system credibility was developed and tested. The results confirm that credibility has two dimensions: expertise and trustworthiness. Further, significant gender differences in credibility perceptions were found. The findings also indicate that respondents prefer humans as recommendation sources and that this preference is influenced by perceptions of lack of credibility of recommender systems as …
Optimising User Acceptance Of Mandated Mobile Health Systems (Mhs): The Epoc (Electronic Point-Of-Care) Project Experience, Lois Burgess, Joan Cooper, Jason P. Sargent
Optimising User Acceptance Of Mandated Mobile Health Systems (Mhs): The Epoc (Electronic Point-Of-Care) Project Experience, Lois Burgess, Joan Cooper, Jason P. Sargent
Faculty of Commerce - Papers (Archive)
From a clinical perspective, the use of mobile technologies such as Personal Digital Assistants (PDAs) within hospital environments is not new. A paradigm shift however, is underway towards the acceptance and utility of such systems within community-based healthcare environments. Notwithstanding, introducing new technologies and associated work practices has intrinsic risks which must be addressed. In situations where end-users of a system are traditionally averse to technology through entrenched paper-based work practices (for example, community health workers), the process of managing change bears considerable determination in system implementation success. The authors propose a novel approach to end user acceptance within the …
Performance Analysis Of Ofdm-Idma Systems With Peak-Power Limitation, Jun Tong, Qinghua Guo, Li Ping
Performance Analysis Of Ofdm-Idma Systems With Peak-Power Limitation, Jun Tong, Qinghua Guo, Li Ping
Faculty of Engineering and Information Sciences - Papers: Part A
This paper is concerned with orthogonal frequency-division multiplexing interleave-division multiple-access (OFDM-IDMA) systems over frequency-selective fading channels. Deliberate clipping is applied to reduce the peak-to-average power ratio (PAPR) of each user's transmitted signal. An iterative multiuser detection (MUD) technique is developed to recover the performance loss due to clipping. A semi-analytical signal-to- noise ratio (SNR) evolution technique is proposed, which can provide quick and accurate prediction of the iterative MUD performance. Numerical results show that the performance of OFDM-IDMA is not sensitive to the frequency selectivity of channels, and OFDM-IDMA is more power-efficient than other alternative multi-carrier transmission techniques. © 2008 …
The Effects Of Different Regulation Systems On Television Food Advertising To Children, Bridget P. Kelly, Lesley King, Adrian Bauman, Ben J. Smith, Victoria M. Flood
The Effects Of Different Regulation Systems On Television Food Advertising To Children, Bridget P. Kelly, Lesley King, Adrian Bauman, Ben J. Smith, Victoria M. Flood
Faculty of Health and Behavioural Sciences - Papers (Archive)
Objective: The aim of this study was to model children’s potential exposure to television food advertisements under different regulatory scenarios to demonstrate the policy implications of regulatory change in Australia. Methods: Television advertising data was collected from Sydney commercial television channels from 14-20 May 2006. Extrapolating from these data, the patterns of food advertising under four regulatory scenarios were examined, including arrangements restricting the content, volume and timing of advertisements. Results: Each scenario resulted in a reduction of total and non-core food advertisements. The scenario to restrict non-core food advertisements during the major viewing period (7:00-20:30) led to the largest …
Remarks On Accessible Steady States For Some Coagulation-Fragmentation Systems, Miguel A. Herrero, Marianito R. Rodrigo
Remarks On Accessible Steady States For Some Coagulation-Fragmentation Systems, Miguel A. Herrero, Marianito R. Rodrigo
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper we consider some systems of ordinary differential equations which are related to coagulation-fragmentation processes. In particular, we obtain explicit solutions of such systems which involve certain coefficients obtained by solving a suitable algebraic recurrence relation. The coefficients are derived in two relevant cases: the high-functionality limit and the Flory-Stockmayer model. The solutions thus obtained are polydisperse (that is, is different from zero for all ) and may exhibit monotonically increasing or decreasing total mass. We also solve a monodisperse case (where is different from zero but is equal to zero for all ) in the high-functionality limit. …
Systems Dynamics Modelling Of Human And Information Aspects Of Network-Centric Configurations, Helen M. Hasan
Systems Dynamics Modelling Of Human And Information Aspects Of Network-Centric Configurations, Helen M. Hasan
Faculty of Commerce - Papers (Archive)
This paper is based on the definition of a network-centric structure as one which enables members of an organisation to create and leverage information to increase competitive advantage through the joint efforts of creative individuals and independent teams. While the technical components of this environment are enabling, the organisational and behavioural components generate value as traditionally competitive workers strive to cooperate in self-directed, distributed teams. Many organisations are now complex hybrids of hierarchical and network-centric configurations and there is a need to increase our understanding of their human and informational aspects. Due to its suitability for managing complexity without reducing …
Reliability Of Fault-Tolerant Systems With Parallel Task Processing, Gregory Levitin, Min Xie, Tieling Zhang
Reliability Of Fault-Tolerant Systems With Parallel Task Processing, Gregory Levitin, Min Xie, Tieling Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
The paper considers performance and reliability of fault-tolerant software running on a hardware system that consists of multiple processing units. The software consists of functionally equivalent but independently developed versions that start execution simultaneously. The computational complexity and reliability of different versions are different. The system completes the task execution when the outputs of a pre-specified number of versions coincide. The processing units are characterized by different availability and processing speed. It is assumed that they are able to share the computational burden perfectly and that execution of each version can be fully parallelized. The algorithm based on the universal …
The Ofdm-Idma Approach To Wireless Communication Systems, Li Ping, Qinghua Guo, Jun Tong
The Ofdm-Idma Approach To Wireless Communication Systems, Li Ping, Qinghua Guo, Jun Tong
Faculty of Engineering and Information Sciences - Papers: Part A
This article outlines the basic principles of OFDM-IDMA. Comparisons with other alternative technologies such as OFDM-CDMA and OFDMA are provided. Some attractive features of OFMD-IDMA are explained, including low-cost iterative multi-user detection, flexible rate adaptation, frequency diversity, and significant advantages regarding spectral and power efficiency. © 2007 IEEE.
On Short Forward Error-Correcting Codes For Wireless Communication Systems, Sheng Tong, Dengsheng Lin, Aleksandar Kavcic, Baoming Bai, Li Ping
On Short Forward Error-Correcting Codes For Wireless Communication Systems, Sheng Tong, Dengsheng Lin, Aleksandar Kavcic, Baoming Bai, Li Ping
Faculty of Engineering and Information Sciences - Papers: Part A
For real-time wireless communications, short forward error-correcting (FEC) codes are indispensable due to the strict delay requirement. In this paper we study the performance of short FEC codes. Reed-Solomon (RS) codes and concatenated zigzag (CZ) codes are chosen as representatives of classical algebraic codes and modern simple iterative decodable codes, respectively. Additionally, we use random binary linear codes as a baseline reference for comparison. Our main results (demonstrated by both simulation and ensemble distance spectrum analysis) are as follows: 1) Short RS codes are as good as random binary linear codes; 2) Carefully designed short low- density parity-check (LDPC) codes …
N-Gens Of Change: Personal Response Systems And Net-Generation Students, Brian Murphy, Ciorstan J. Smark
N-Gens Of Change: Personal Response Systems And Net-Generation Students, Brian Murphy, Ciorstan J. Smark
Faculty of Commerce - Papers (Archive)
Personal Response Systems are a technology similar to use to a television remote control or a mobile telephone for sending SMS messages. They enable almost instant communication between student and instructor in lecture situations. This paper examines the claims made by Personal Response Systems and considers whether they may be especially appropriate to the preferences and expectations of Net- Generation students. The Net-Generation (also known as N-Gens) is made up of students born between 1981 and 2001. They now make up the bulk of finance students in universities across our region. But have we really adapted our lecturing styles to …
Control Strategy Of Distributed Generation For Voltage Support In Distribution Systems, An D. T Le, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich
Control Strategy Of Distributed Generation For Voltage Support In Distribution Systems, An D. T Le, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich
Faculty of Engineering and Information Sciences - Papers: Part A
Voltage problem is always a critical issue in operating a distribution system. The uncertainties of load distribution and variation have introduced a great complexity to the task of maintaining system voltage within the permitted range. In this paper, small-scale generator, known as distributed generation (DG), is employed in the system and acting as a voltage regulator. The output of DG is controlled in such a way that acceptable level of electrical supply quality is achieved with a reasonable operating cost. The DG controller is tested with a non-uniformly varying load on the time domain basis. Simulations have been conducted with …
Experience In The Application Of Iec/Tr 61000-3-6 To Harmonic Allocation In Transmission Systems, T J. Browne, V J. Gosbell, S Perera, D A. Robinson, L M. Falla, P J. Windle, A C. D Perera
Experience In The Application Of Iec/Tr 61000-3-6 To Harmonic Allocation In Transmission Systems, T J. Browne, V J. Gosbell, S Perera, D A. Robinson, L M. Falla, P J. Windle, A C. D Perera
Faculty of Engineering and Information Sciences - Papers: Part A
Technical report IEC/TR 61000-3-6 is widely used as a guide to harmonic management in HV and MV networks, assisting in coordination of harmonic levels between utility and customer. In 2001, Australia and New Zealand adopted the harmonic standard AS/NZS 61000.3.6, which closely follows the above IEC technical report. As a result, transmission utilities and connected loads are required by government regulations to abide by the harmonic allocations set by the standard. The technical report contains some useful general principles which can be applied to the harmonic management of power systems. However, unexpected difficulties can be found when attempts are made …
Distributed Generation For Minimization Of Power Losses In Distribution Systems, Kashem M. Muttaqi, An D. T Le, Michael Negnevitsky, Gerard Ledwich
Distributed Generation For Minimization Of Power Losses In Distribution Systems, Kashem M. Muttaqi, An D. T Le, Michael Negnevitsky, Gerard Ledwich
Faculty of Engineering and Information Sciences - Papers: Part A
Appropriate size and location of distributed generation (DG) play a significant role in minimizing power losses in distribution systems. This paper represents techniques to minimize power losses in a distribution feeder by optimizing DG model in terms of size, location and operating point of DG. Sensitivity analysis for power losses in terms of DG size and DG operating point has been performed. The proposed sensitivity indices can indicate the changes in power losses with respect to DG current injection. The proposed techniques have been developed with considering load characteristics and representing loads with constant impedance and constant current models, separately. …
Applying Formal Concept Analysis To Semantic File Systems Leveraging Wordnet, Benjamin Martin, Peter W. Eklund
Applying Formal Concept Analysis To Semantic File Systems Leveraging Wordnet, Benjamin Martin, Peter W. Eklund
Faculty of Health and Behavioural Sciences - Papers (Archive)
Formal Concept Analysis can be used to obtain both a natural clustering of documents along with a partial ordering over those clusters. The application of Formal Concept Analysis requires input to be in the form of a binary relation between two sets. This paper investigates how a semantic filesystem can be used to generate such binary relations. The manner in which the binary relation is generated impacts how useful the result of Formal Concept Analysis will be for navigating one’s filesystem.
Hoglex Demand Systems And Welfare Policy In Major Asean Developing Countries: A Bayesian Analysis Using Expenditure Unit Records, Hikaru Hasegawa, Rebecca Valenzuela, Tran Van Hoa
Hoglex Demand Systems And Welfare Policy In Major Asean Developing Countries: A Bayesian Analysis Using Expenditure Unit Records, Hikaru Hasegawa, Rebecca Valenzuela, Tran Van Hoa
Faculty of Commerce - Papers (Archive)
the explicit and estimable HOGLEX demand system ( Tran Van Hoa, 1983, 1985 and Jerison and Jersion 1984) links for the first time an important aspect of economic theory and the statisticals of Box-Cox transformation analysis.
Implementing Systems In Complex Work Organisations, Wannapa Suratmethakul, Helen M. Hasan
Implementing Systems In Complex Work Organisations, Wannapa Suratmethakul, Helen M. Hasan
Faculty of Commerce - Papers (Archive)
This paper describes research on a case of the introduction, into a large educational institution, of a complex timetabling system that was already well established in other similar organisations. The research has used a grounded theory approach to reveal details within complex phenomena in an organisation when a substantial new system was implemented. The study revealed three critical issues: Knowledge Transfer, System Capability, and Organisational Context that appeared to be related to the problems of implementing the new information system in the organisation. This research adds to the understanding of a common situation where management have an over simplified view …
Towards Executive Information Systems Adoptions By Knowledge Workers: An Extension Of The Technology Acceptance Model To Account For Social-Cultural Factors, Emmanuel Ikart
Faculty of Commerce - Papers (Archive)
In recent years a number of organisations have implemented executive information systems (EIS) in order to improve the performance gains on their executives’ job. Although the use of EIS is important to executives, majority of executives are unwilling to use EIS because of their design failures. By using social factors, habits and facilitation conditions variables from Triandis’ framework, this paper extends the Technology Acceptance Model (TAM) to derive useful variables to address the problem of the low usage of EIS by executives. This paper reports on the research in progress in Australia on the adoption and usage of EIS by …
Minimising Power Losses In Distribution Systems With Distributed Resources, An D. T Le, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich
Minimising Power Losses In Distribution Systems With Distributed Resources, An D. T Le, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich
Faculty of Engineering and Information Sciences - Papers: Part A
Attempts to reduce electricity cost, together with improving the efficiency of distribution systems, have led power utilities to dealing with the problem of power loss minimisation. Although losses in the system can never be entirely eliminated, they can be controlled and minimised in several ways. Research conducted in the last few decades has proven that an inclusion of Distributed Resources (DR) into distribution systems considerably lowers the level of power losses. Moreover, the choice of DR is even more attractive since it provides not only benefits in power loss minimisation, but also a wide range of other advantages including environment, …
Personal Response Systems Workshop, Brian Murphy, Ciorstan J. Smark
Personal Response Systems Workshop, Brian Murphy, Ciorstan J. Smark
Faculty of Commerce - Papers (Archive)
Personal response systems (PRS) are known under several names. "Clickers"; "Audience Response Systems"; "Group Response Systems"; and "Classroom Performance Systems"; all of these are systems where the audience can respond to questions or give feedback to the presenter of a lecture or workshop whilst that presentation is taking place. This allows for immediate, and (if wished) anonymous feedback to the presenter and to the class.
An Automated Gis Method For Modeling Relative Wave Exposure Within Complex Reef-Island Systems: A Case Study Of The Great Barrier Reef, Marjetta L. Puotinen
An Automated Gis Method For Modeling Relative Wave Exposure Within Complex Reef-Island Systems: A Case Study Of The Great Barrier Reef, Marjetta L. Puotinen
Faculty of Science - Papers (Archive)
Patterns of wave energy play a significant role in shaping the long-term structure of coral reef communities worldwide. For example, sections of reefs have been shown to vary greatly in morphology (dominant size class, growth form) as coral colonies adapt in response to local-scale differences in the wave heights typically experienced. These differences result in zonation (crest, lagoon, and slope), producing characteristic growth forms and species assemblages that vary in their vulnerability to damage from waves (Done 1993). Those communities experiencing the greatest typical wave energy align themselves parallel to the water flow, adopt stream-lined forms and are usually smaller …
Energy Injection By Disbributed Generation For Enhancement Of Voltage Profile In Swer Systems, Kashem M. Muttaqi, Gerard Ledwich
Energy Injection By Disbributed Generation For Enhancement Of Voltage Profile In Swer Systems, Kashem M. Muttaqi, Gerard Ledwich
Faculty of Engineering and Information Sciences - Papers: Part A
A system with Distributed Generation (DG) has greater load carrying capacity and can correct for a poor voltage profile during peak loading. This paper addresses the loading patterns of rural feeders and the relative effectiveness of real and reactive injection to support voltage profile in Single Wire Earth Return (SWER) systems. Real and reactive injection on a SWER network has been investigated and required energy for voltage enhancement estimated. DG with real and reactive injection (DG-PQ) using Q priority (DG-QPQ) can drastically reduce fuel and energy requirements compared to the amount required by proportional use of real and reactive power …
Maximising Voltage Support In Distribution Systems By Distributed Generation, An D. T Le, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich
Maximising Voltage Support In Distribution Systems By Distributed Generation, An D. T Le, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich
Faculty of Engineering and Information Sciences - Papers: Part A
Rapidly increasing in the demand of electricity along with recently advances in distributed generation (DG) technologies have sparked a new interest in utilisation of DG sources. However, there are a number of technical issues regarding to the installation of DG, since DG connection significantly affects existing network configuration and operation, especially for system with high level of DG penetration. To achieve maximum voltage support from DG utilisation, methodologies related to DG placement and DG operation are developed in this paper. Technique to optimise voltage improvement by effectively injecting active and reactive power of DG is developed based on voltage sensitivity …
Dynamic Channel Allocation For Mobile Cellular Systems Using A Control Theoretical Approach, Yaya Wei, Chuang Lin, Raad Raad, Fengyuan Ren
Dynamic Channel Allocation For Mobile Cellular Systems Using A Control Theoretical Approach, Yaya Wei, Chuang Lin, Raad Raad, Fengyuan Ren
Faculty of Engineering and Information Sciences - Papers: Part A
The guard channel scheme in wireless mobile networks has attracted and is still drawing research interest owing to easy implementation and flexible control. Dynamic guard channel schemes have already been proposed in the literature to adapt to varying traffic load. This paper presents a novel control-theoretic approach to dynamically reserve guard channels called PI-Guard Channel (PI-GC) controller that maintains the handoff blocking probability (HBP) to a predefined value; while it still improves the channel resource utilization.
Eliciting And Specifying Requirements For Highly Interactive Systems Using Activity Theory, Robert B. K. Brown, Peter Hyland, Ian C. Piper
Eliciting And Specifying Requirements For Highly Interactive Systems Using Activity Theory, Robert B. K. Brown, Peter Hyland, Ian C. Piper
Faculty of Engineering and Information Sciences - Papers: Part A
The processes of eliciting user requirements and formalising these into specifications are critical for the success of highly interactive systems. These processes are still poorly understood, partly because current methods are usually ad hoc and lack any theoretical basis. A number of researchers have used Activity Theory (AT) to refine these processes and have met with some success. To date, this approach has been more useful explaining the processes post hoc. This positional paper proposes an AT method for requirement elicitation and specification definition. The method is sufficiently prescriptive and well formed that it does not require any detailed understanding …
Executive Information Systems And The Top-Officers' Roles: An Exploratory Study Of User-Behaviour Model And Lessons Learnt, Emmanuel Ikart
Executive Information Systems And The Top-Officers' Roles: An Exploratory Study Of User-Behaviour Model And Lessons Learnt, Emmanuel Ikart
Faculty of Commerce - Papers (Archive)
In recent years a number of organisations have implemented executive information systems (EIS) in order to improve the performance of their executives’ jobs. Although the use of EIS is important in executives’ work, the majority of executives are unwilling to use EIS applications because of their design flaws. By using social factors, habits and facilitation condition variables from Triandis’ framework, this paper extends the Technology Acceptance Model (TAM) to derive useful variables to address the problem of the low usage of EIS by executives. This paper reports on research in progress in Australia on the adoption and usage of EIS …
Application Of Human Reasoning In Question Answering Systems, Farhad Oroumchian, E. Darudi, M. Rahgozar, B. Ofogi
Application Of Human Reasoning In Question Answering Systems, Farhad Oroumchian, E. Darudi, M. Rahgozar, B. Ofogi
Faculty of Commerce - Papers (Archive)
No abstract provided.
Systems Resemblance And Workpractice Evolution: Implications For Work Activity (Re)Design, Rodney J. Clarke
Systems Resemblance And Workpractice Evolution: Implications For Work Activity (Re)Design, Rodney J. Clarke
Faculty of Commerce - Papers (Archive)
This paper is concerned with addressing the question of how apparently disparate and unconnected systems can resemble each other. The question of what counts as a systems resemblance necessitates developing contextual workpractice descriptions associated with the systems features and ultimately entire systems. Using systemic semiotics an apparent ontogenetic convergence between entirely different systems is used to show that systems resemblance can be inferred when the constituent workpractices of information systems consist of comparable register features and especially if they exhibit comparable generic features. The implications of these findings for a new class of work activity (re)design practices are considered.
Socio-Technical Systems: From Individual Transactions To Situated Community Activity, Helen M. Hasan
Socio-Technical Systems: From Individual Transactions To Situated Community Activity, Helen M. Hasan
Faculty of Commerce - Papers (Archive)
Although basic concepts of Activity Theory were articulated almost a century ago, they have stood the test of time and are proving to be appropriate for research into modem situation involving the use of socio-technical systems. Over the past decades the field of Information Systems has advanced from a focus on routine transaction processing systems to more sophisticated applications that support situated community activity. This chapter will describe how Activity Theory is becoming increasing relevant to these types of systems and can be complemented by other approaches such as Complexity Theory and a particular Knowledge Lens. Research is presented that …
Restructuring Help Systems Using Formal Concept Analysis, Peter W. Eklund, Bastian Wormuth
Restructuring Help Systems Using Formal Concept Analysis, Peter W. Eklund, Bastian Wormuth
Faculty of Commerce - Papers (Archive)
This paper extends standard help system technology to demonstrate the suitability of Formal Concept Analysis in displaying, searching and navigating help content. The paper introduces a method for building suitable scales directly from the help system index by computing a keyword extension set. The keyword extension technique is generalisable in any document collection where a hand-crafted index of terms is available.