Digital Commons Network^™

Literacy And Recent History Of Diarrhoea Are Predictive Of Plasmodium Falciparum Parasitaemia In Kenyan Adults, Rodney Coldren, Trish Prosser, Fredrick Ogolla, Victor Ofula

Research outputs pre 2011

Background - Malaria is one of the most serious health problems in Kenya. In 2004, the Kenya Medical Research Institute and the US Army Medical Research Unit – Kenya surveyed adults in Samburu, Malindi, and Busia districts to determine socioeconomic risk factors for infection.

Methods - Sociodemographic, health, and antimalarial data were collected along with blood for malaria testing. A smear was considered negative only if no Plasmodium falciparum parasites were observed in 100 high-powered fields. Univariate analysis was performed with Pearson's Chi-square test and univariate logistic regression. A multivariate logistic regression model was then created which included only variables …

A Comparison Of Heuristics For Scheduling Spatial Clusters To Reduce I/O Cost In Spatial Join Processing, Jitian Xiao

Research outputs pre 2011

In spatial join processing, a common method to minimize the I/O cost is to partition the spatial objects into clusters, and then to schedule the processing of the clusters in the spatial join processing such that the number of times the same objects to be fetched into memory can be minimized. A key issue of this clustering-and-scheduling approach is how to produce a better sequence of clusters to guide the cluster scheduling thus to reduce the total I/O cost of spatial join processing. This paper describes three cluster sequencing heuristics. An extensive comparison among them has been conducted, and simulation …

Reproductive Hormones Modulate Oxidative Stress In Alzheimer's Disease, Anna Barron, Stephanie Fuller, Giuseppe Verdile, Ralph Martins

Research outputs pre 2011

Alzheimer's disease (AD) is a neurodegenerative disease characterized by gradual cognitive decline, impairments in speech and language, and dysfunction in the sensorimotor systems, culminating in complete reliance on nursing care. Oxidative stress, caused by an imbalance in the pro-oxidant/antioxidant mechanisms in the body, has been implicated in AD pathogenesis, as in many other age-associated diseases such as atherosclerosis, Parkinson disease, and amyotrophic lateral sclerosis. Although the hormones estrogen, progesterone, testosterone, and luteinizing hormone are best known for their roles in reproduction, many studies show these hormones have other roles, including neuroprotection. Changes in the levels of these hormones that occur …

Joint Optimization In Capacity Design Of Networks With P-Cycle Using The Fundamental Cycle Set, Hoang Nguyen, Daryoush Habibi, Viet Q Phung, Stefan Lachowicz, Kungmang Lo, Byung Kang

Research outputs pre 2011

We propose a joint optimization model for capacity design of networks with p-cycles. The model is based on a modified definition of network fundamental cycles and the available straddling links. Concepts about visible and hidden straddling links, which are essential components of our model are also introduced. This is the first ILP model for joint optimization of p-cycle network that can be solved without enumerating p-cycle candidates, and has the ability to achieve optimum solutions. In addition, the complexity of our proposed model is much smaller than any conventional models, particularly when applying to a planar network. This model is …

A Hybrid P-Cycle Search Algorithm For Protection In Wdm Mesh Networks, Kungmang Lo, Daryoush Habibi, Alexander Rassau, Quoc Viet Phung, Hoang Nguyen, Byung Kang

Research outputs pre 2011

p-Cycle is a type of shared link protection for survivable wavelength-division multiplexing (WDM) mesh networks. p-Cycle not only retains ring-like restoration speeds, but also achieves capacity efficiency in mesh networks. However, finding the optimal set of p-cycles to protect all traffic demands within a reasonable response time is difficult. This is particularity true with dense meshes or large networks, because the number of candidates is huge. Generally, p-cycles are determined by using either Integer Linear Programming (ILP) or specifically designed heuristic algorithms. However, both methods need a set of efficient candidate cycles to tradeoff between the computational time and the …

Efficient P-Cycle Design By Heuristic P-Cycle Selection And Refinement For Servivable Wdm Mesh Networks, Kungmang Lo, Daryoush Habibi, Quoc Viet Phung, Alexander Rassau, Hoang N. Nguyen

Research outputs pre 2011

Using p-Cycles to protect against single span failures in Wavelength-Division Multiplexing (WDM) networks has been widely studied. p-Cycle retains not only the speed of ring-like restoration, but also achieves the capacity efficiency over mesh networks. However, in selecting an optimal set of p-cycles to achieve the minimum spare capacity and fast computational time is an NP-hard problem. To address this issue, we propose a heuristic approach to iteratively select and refine a set of p-cycles, which contains two algorithms: the Heuristic p-Cycle Selection (HPS) algorithm, and the Refine Selected Cycles (RSC) algorithm. Our simulation results show that the proposed approach …

A Segmentation Method For Shared Protection In Wdm Networks, Quoc Viet Phung, Daryoush Habibi, Hoang Nguyen, Kungmeng Lo

Research outputs pre 2011

Shared link and shared path protections have been recognized as preferred schemes to protect traffic flows against network failures. In recent years, another method referred to as Shared Segment Protection has been studied as an alternative solution for protection. This method is more flexible and efficient in terms of capacity utilization and restoration time. However, to our best knowledge, this method has mostly been studied in dynamic provisioning scenarios in which searching for restoration paths is dynamically performed after a failure has occurred. In this paper, based on the path segmentation idea, we propose a method to generate good candidate …

Core Temperature And Hydration Status During An Ironman Triathlon, Paul B. Laursen, Rob Suriano, Marc Quod, Hamilton Lee, Chris Abbiss, Kazunori Nosaka, David Martin, David Bishop

Research outputs pre 2011

No abstract provided.

Reliability Of Normalisation Methods For Emg Analysis Of Neck Muscles, Kevin Netto, Angus F Burnett

Research outputs pre 2011

Acceptable reliability of normalisation contractions in electromyography (EMG) is paramount for testing conducted over a number of days or if normal laboratory strength testing equipment is unavailable. This study examined the reliability of maximal voluntary isometric contractions (MVIC) and sub-maximal (60%) isometric contractions for use in neck muscle EMG studies. Surface EMG was recorded bilaterally from eight sites around the neck at C4/5 level from five healthy male subjects. Subjects performed MVIC and sub-maximal normalisation contractions using an isokinetic dynamometer (ID) and a portable cable dynamometer with attached strain gauge (PCD) in addition to a MVIC against a manual resistance …

An Approach To Resolve Data Model Heterogeneities In Multiple Data Sources, Chaiyaporn Chirathamjaree

Research outputs pre 2011

To gain a competitive advantage, it is imperative for executives to be able to obtain one unique view of information, normally scattered across disparate data sources, in an accurate and timely manner. To interoperate data sources which differ structurally and semantically, particular problems occur, for example, problems of changing schema in data sources affect the integrated schema. This paper presents an approach to resolve data model heterogeneities in databases and legacy systems through mediation and wrapping techniques. The system is well supported by the mediated data model (MDM), a semantically-rich data model which can describe and represent heterogeneous data schematically …

Opening Pandora's Box: Teacher Librarianship In The Twenty-First Century, Barbara Combes

Research outputs pre 2011

In a world that is currently struggling to come to terms with the Internet, the exponential explosion in the volume of readily available information and a plethora of delivery modes and resource formats; the role of the teacher librarian and the school library in this new information landscape is murkier than ever before, This presentation looks at how teacher librarians can reinvent themselves and their school libraries to become an essential component of the core business of the school, i.e." teaching and learning, It is all about unlocking hidden talents, facing challenges and taking control.

Use Of Bootable Linux Cds For The Delivery Of Educational Course Content, Craig Valli

Research outputs pre 2011

This paper outlines the processes involved in creating and using bootable Linux/Knoppix compact discs (CDs) as a means of delivering course content to students. An outline of experiences in using these CDs to deliver courses in totally on-line mode is also given.

Developing Recordkeeping: Australians Working Together, Karen Anderson

Research outputs pre 2011

Australia has nine governments, each with their own archives and records legislation. This multiplicity of jurisdictions has the potential for generating divergence and incompatibility of standards. However, the Australian recordkeeping community works together with the result that consistent, complementary standards are not only customised to local legislative requirements and situations, but will in future ensure interoperability and ease of transfer of records wherever necessary. Australian recordkeeping professionals have a sound history of working together. The Implementation Guidelines for the current International standard for records management, /SO15489.2-2001, were adopted and adapted from those in an earlier Australian Standard for records management, …

A Faster Algorithm For Calculating Hypervolume, Lyndon While, Philip Hingston, Luigi Barone, Simon Huband

Research outputs pre 2011

We present an algorithm for calculating hypervolume exactly, the Hypervolume by Slicing Objectives (HSO) algorithm, that is faster than any that has previously been published. HSO processes objectives instead of points, an idea that has been considered before but that has never been properly evaluated in the literature. We show that both previously studied exact hypervolume algorithms are exponential in at least the number of objectives and that although HSO is also exponential in the number of objectives in the worst case, it runs in significantly less time, i.e., two to three orders of magnitude less for randomly generated and …

Fixture-Scheduling For The Australian Football League Using A Multi-Objective Evolutionary Algorithm, Luigi Barone, Lyndon While, Paul Hughes, Philip Hingston

Research outputs pre 2011

AFL football is a team sport that entertains millions and contributes a huge amount of money to the Australian economy. Scheduling games in the AFL is difficult, as a number of different, often conflicting, factors must be considered. In this paper, we propose the use of a multi-objective evolutionary algorithm for determining such a schedule. We detail the technical details needed to apply a multi-objective evolutionary algorithm to this problem and report on experiments that show the effectiveness of this approach. Comparison with actual schedules used in the AFL demonstrates that this approach could make a useful contribution.

A Preliminary Investigation Into Malware Propagation On Australian Isp Networks Using The Mwcollect Malware Collector Daemon, Craig Valli

Research outputs pre 2011

This paper describes an initial investigation into the propagation of malicious software (malware) that allows for remote command and control of Internet connected machines using the Windows platform in the Australian ISP address space. The research as conducted utilised the mwcollect daemon which is a low interaction honeypot on the Linux platform, to collect the details about the activity. The program mwcollect works by emulation of vulnerable services on the target platform in this case Windows based computers. There were two collectors within the pilot collection system. The machines were running no other Internet services such as http or mail, …

The Insider Threat To Medical Records: Has The Network Age Changed Anything?, Craig Valli

Research outputs pre 2011

There is increasing pressure on medical practices to use digital information systems for storage of patient data. Some consideration is given to protecting these systems from a external or “ hacker” focus. This paper looks at the issue that the increasing use of digital information systems has for insider malfeasance.

Sql Injection - Threats To Medical Systems: The Issues And Countermeasures, Craig Valli

Research outputs pre 2011

A vast majority of medical information systems use Standard Query Language databases (SQL) as the underlying technology to deliver medical records in a timely and efficient manner. SQL is a standardised and well entrenched database technology, which allows for the development of robust, customised applications for information management. In recent years, SQL has been used as the back-end to many successful web client accessible applications. The use of SQL in this manner has been greatly enhanced through the development of server side scripting languages such as Microsoft ASP and open source systems such as PHP. These allow for the representation …

High-Speed (2.5 Gbps) Reconfigurable Inter-Chip Optical Interconnects Using Opto-Vlsi Processors, Muhsen Aljada, Kamal Alameh, Yong Lee, Il-Sug Chung

Research outputs pre 2011

Reconfigurablele optical interconnects enable flexible and high-performance communication in multi-chip architectures to be arbitrarily adapted, leading to efficient parallel signal processing. The use of Opto-VLSI processors as beam steerers and multicasters for reconfigurable inter-chip optical interconnection is discussed. We demonstrate, as proof-of-concept, 2.5 Gbps reconfigurable optical interconnects between an 850nm vertical cavity surface emitting lasers (VCSEL) array and a photodiode (PD) array integrated onto a PCB by driving two Opto-VLSI processors with steering and multicasting digital phase holograms. The architecture is experimentally demonstrated through three scenarios showing its flexibility to perform single, multicasting, and parallel reconfigurable optical interconnects. To our …

Opto-Vlsi-Based Correlator Architecture For Multiwavelength Optical Header Recognition, Muhsen Aljada, Kamal E. Alameh, Khalid Al-Begain

Research outputs pre 2011

A novel optical correlator employing an opto-very-large-scale-integration (VLSI) processor to construct the routing lookup table, in conjunction with an array of fiber Bragg gratings (FBGs) for multiwavelength optical header recognition is demonstrated. The FBG array provides wavelength-dependent time delays, whereas the opto-VLSI processor generates wavelength intensity profiles that match arbitrary bit patterns. The recognition of 4-b optical patterns is experimentally demonstrated at 2.2 Gb/s by showing that the correlator produces an autocorrelation waveform of high peak whenever the input bit pattern matches the wavelength intensity profile.

Catastrophic And Parametric Fault Modelling For Photonic Systems, Muhsen Aljada, Adam Osseiran, Kamal Alameh

Research outputs pre 2011

In this paper, we investigate the impact of the most common catastrophic and parametric faults in photonic systems. We demonstrate, using the example of a photonic correlator, the effectiveness of testing techniques for fault detection in photonic systems. To the best of our knowledge, this constitutes the first attempt to define a fault model and to develop a test methodology for photonic systems.

Distributed Wireless Optical Communications For Humanitarian Assistance In Disasters, Muhsen Aljada, Kamal Alameh, Khalid Al-Begain

Research outputs pre 2011

We propose an optical wireless communication network architecture employing an all-optical central communication unit and optical transceiver units. The network can easily be installed when communication network facilities are partially damaged by a disaster. The network performance is simulated at 1Gbit/s, over 1km under different weather conditions.

Performance Analysis Of Gb/S Wdm Fddi Network, Muhsen Aljada, Kamal Alameh, Khalid Al-Begain

Research outputs pre 2011

In this paper, we propose a time-token multi-Gb/s Wavelength Division Multiplexing Fibre Distributed Data Interface (WDM/FDDI) architecture and examine its throughput efficiency and delay under heavy load for different network configuration using discrete event simulator.

Dynamic Optical Comb Filter Using Opto-Vlsi Processing, Zhenglin Wang, Kamal Alameh, Rong Zheng, Chung Poh

Research outputs pre 2011

Reconfigurable multi-channel optical filters are presented in this paper. The operation principle of the reconfigurable filter is based on the dynamic beam steering capacity of Opto-VLSI processor in conjunction with a high dispersion free space grating. The dispersion grating separates the input signal spectrum while the Opto-VLSI processor is driven by optimised phase holograms to dynamically select the wavelengths to be coupled into the output port. Experimental results show that up to 8 bands can be synthesised, with a wavelength tuning span of 10 nm and a 3dB bandwidth less than 0.5nm.

Reconfigurable Photonic Rf Filter Based On Opto-Vlsi Processing, Rong Zheng, Kamal Alameh, Zhenglin Wang

Research outputs pre 2011

In this paper, a novel reconfigurable 5-tap photonic RF filter based on Opto-VLSI processor is proposed where an Opto-VLSI processor is used in conjunction with a 5-fibre Bragg grating (FBG) array to slice the spectrum of a broad band light source, thus achieving commensurate true-time delays and variable tap weights. The proposed photonic RF filterstructure is experimentally demonstrated by means of several examples which show the capability of the Opto-VLSI processor to synthesise transversal RF filter responses with adaptive weights.

Magnetic Photonic Crystals: 1-D Optimization And Applications For The Integrated Optics Devices, Mikhail Vasiliev, Kamal E. Alameh, Vladimir I. Belotelov, Vyacheslav A. Kotov, Anotoly K. Zvezdin

Research outputs pre 2011

The optimization of multilayer one-dimensional (1-D) magnetophotonic crystals (MPCs) with multiple phase shifts, enabling their design to be tailored to practical photonics applications, is reported. The properties of sample optimized structures suitable for application in infrared intensity modulators are discussed. A novel scheme of high-resolution magnetic field sensing using MPCs is proposed. The effect of material absorption on spectral properties is shown.

Demonstration Of Tunable Optical Notch Filter Using 1-D Opto-Vlsi Processor, Chung Kiak Poh, Kamal Alameh, Zhenglin Wang

Research outputs pre 2011

An opto-very-large-scale-integrated (opto-VLSI)-based tunable optical filter structure is demonstrated. Filter tunability is achieved by reconfiguring the holographic diffraction grating of an opto-VLSI processor, allowing virtually any type of filter response to be synthesized. A proof-of-concept tunable notch filter with wavelength span of 7 nm is experimentally verified

Improving The Steering Efficiency Of 1x4096 Opto-Vlsi Processor Using Direct Power Measurement Method, Chung Poh, Kamal Alameh

Research outputs pre 2011

We report optimization of the steering efficiency of the 1-D Opto-VLSI processor using direct power measurement method for wavelengths in the near-IR and 632 nm. Highest improvement observed for the signal and interport isolation is 8 dB and 12 dB respectively. This improved performance of the processor is crucial to the realization of low crosstalk reconfigurable optical add/drop multiplexers (ROADM) using Opto-VLSI processors.

Establishing A Vendor Neutral Skills Based Framework For Digital Forensics Curriculum Development And Competence Assessment, Craig Valli

Research outputs pre 2011

This paper outlines an approach being undertaken between ECU and the Australian Electronic Evidence Special Advisory Group (EESAG) in the production of vendor neutral skills matrix for developing curriculum and evaluating competence. The framework is constructed using Blooms Taxonomy of Learning. This is a work in progress paper and covers the inital stages of the development

A Forensic Log File Extraction Tool For Icq Instant Messaging Clients, Kim Morfitt, Craig Valli

Research outputs pre 2011

Instant messenger programs such as ICQ are often used by hackers and criminals for illicit purposes and consequently the log files from such programs are of interest in a forensic investigation. This paper outlines research that has resulted in the development of a tool for the extraction of ICQ log file entries. Detailed reconstruction of data from log files was achieved with a number of different ICQ software. There are several limitations with the current design including timestamp information not adjusted for the time zone, data could be altered, and conversations must be manually reconstructed. Future research will aim to …