Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 30 of 37

Full-Text Articles in Entire DC Network

Comparative Analysis Of Dynamic Line Rating Models And Feasibility To Minimise Energy Losses In Wind Rich Power Networks, Mathew Simms, Lasantha Meegahapola Dec 2013

Comparative Analysis Of Dynamic Line Rating Models And Feasibility To Minimise Energy Losses In Wind Rich Power Networks, Mathew Simms, Lasantha Meegahapola

Dr Lasantha G Meegahapola

Wind power generation has indicated an exponential increase during last two decades and existing transmission network infrastructure is increasingly becoming inadequate to transmit remotely generated wind power to load centres in the network. The dynamic line rating (DLR) is one of the viable solutions to improve the transmission line ampacity during high wind penetration without investing on an additional transmission network. The main objective of this study is to identify the basic differences between two main line rating standards, since transmission network service providers (TNSPs) heavily depend on these two standards when developing their line rating models. Therefore, a parameter …


Flicker Propagation Analysis In Distribution Networks With Embedded Generation, D Perera, L Meegahapola, S Perera, P Ciufo Dec 2013

Flicker Propagation Analysis In Distribution Networks With Embedded Generation, D Perera, L Meegahapola, S Perera, P Ciufo

Dr Lasantha G Meegahapola

Embedded generators such as wind generators can produce observable voltage fluctuations during variable wind conditions hence flicker. The flicker produced by such intermittent and fluctuating generating sources can propagate to other parts of the distribution network while creating power quality issues in distribution feeders. This study presents a flicker emission analysis for a doubly-fed induction generator (DFIG) based wind farm and investigate the pertinent factors which influence flicker propagation and attenuation in distribution feeders. Study has shown that voltage fluctuations are significantly influenced by the attenuation characteristics of various load types (i.e. constant power, impedance and current loads) connected to …


Perceptions And Practices Of Adults With Asthma: A Social Cognitive Analysis, Kelly L. Andrews, Sandra C. Jones, Judy Mullan Jul 2013

Perceptions And Practices Of Adults With Asthma: A Social Cognitive Analysis, Kelly L. Andrews, Sandra C. Jones, Judy Mullan

Judy Mullan

This article describes a qualitative study that investigated the experiences, attitudes, and opinions of adults with asthma regarding self-managing their disease. Focus groups were conducted with 22 adults living in metropolitan and regional New South Wales, Australia. Key findings were that the perceived stigma of asthma, the need for social support, and the need for "asthma-friendly general practitioners" concerned participants more than formal self-management procedures such as written Asthma Action Plans and medication regimes. Social cognitive theory was used to explain the fluid relationship between persons with asthma, their environment, and their behavior in relation to self-management strategies and in …


Telling Stories: Text Analysis In A Museum, Emily Rose Purser Jul 2013

Telling Stories: Text Analysis In A Museum, Emily Rose Purser

Emily R Purser

Museum texts tell interesting stories, and their role in public education makes them quite important. The exhibition discussed in this paper gives a message that interests, but also concerns me, as a teacher of language, communication and cultural studies. It is a case of one culture telling stories about another, and in such a delicate arena there is much potential to cause offence. The exhibition in question is about peoples of the Pacific, and is in a major European museum of the world's indigenous cultures (BerlinDahlem). I had visited it to see how Australian cultures are represented in image and …


Factor Analysis And Validity Of A Short Six-Item Version Of The Desires For Alcohol Questionnaire, C Mo, Frank P. Deane, Geoffrey C. Lyons, Peter Kelly Jul 2013

Factor Analysis And Validity Of A Short Six-Item Version Of The Desires For Alcohol Questionnaire, C Mo, Frank P. Deane, Geoffrey C. Lyons, Peter Kelly

Peter Kelly

Reductions in cravings have been associated with improved recovery from alcohol and other drug use problems. Self-report assessments of cravings provide a way of monitoring progress over the course of treatment particularly in residential settings. There is a need to develop brief craving measures suitable for repeat administration. The aim of the study was to assess the reliability and validity of a six-item version of the Desires for Alcohol Questionnaire (DAQ-6). In study 1 exploratory factor analysis involving 710 participants attending residential treatment revealed two factors: 'expectancy of negative reinforcement' and 'strong desires and intentions'. In study 2 confirmatory factor …


Doing Discourse Analysis, Gordon R. Waitt Jul 2013

Doing Discourse Analysis, Gordon R. Waitt

Gordon Waitt

My hope in writing this chapter is to generate enthusiasm for geographical research employing discourse analysis. My intention is to provide some advice on doing discourse analysis to facilitale the design of research. I first outline why some geographers have been inspired by this approach. I suggest how Foucauldian discourse analysis is a break from other critical methods applied to textual analysis, including content analysis, semiology, and iconography. The theoretical underpinnings of the method provided by Michel Foucault, a French poststructuralist philosopher, is a key source of difference. I therefore condense Michel Foucault's contribution to discourse analysis by sketching out …


Lower-Limb Amputee Rehabilitation In Australia: Analysis Of A National Data Set 2004-10, Brenton G. Hordacre, Tara Stevermuer, Frances Simmonds, Maria Crotty, Kathy Eagar Jun 2013

Lower-Limb Amputee Rehabilitation In Australia: Analysis Of A National Data Set 2004-10, Brenton G. Hordacre, Tara Stevermuer, Frances Simmonds, Maria Crotty, Kathy Eagar

Kathy Eagar

Objective. Examine demographics, clinical characteristics and rehabilitation outcomes of lower-limb amputees, using the Australasian Rehabilitation Outcomes Centre (AROC) database. Methods. Lower-limb amputee rehabilitation separations between 2004 and 2010 were identified using AROC impairment codes 5.3-5.7.1 Analysis was conducted by year, impairment code, Australian National Sub-acute and Non-Acute Patient (AN-SNAP) classification (S2-224, Functional Independence Measure (FIM) motor(Mot) score 72-91; S2-225, FIM (Mot) score 14-71) and states of Australia. Results. Mean length of stay (LOS) for all lower-limb amputee episodes was 36.1 days (95% confidence interval (CI): 35.4-36.9). Majority of episodes were unilateral below knee (63.6%), males (71.8%) with a mean age …


Referral Patterns And Proximity To Palliative Care Inpatient Services By Level Of Socio-Economic Disadvantage. A National Study Using Spatial Analysis., David C. Currow, Samuel F. Allingham, Sonia Bird, Patsy Yates, Joanne Lewis, James P. Dawber, Kathy Eagar Jun 2013

Referral Patterns And Proximity To Palliative Care Inpatient Services By Level Of Socio-Economic Disadvantage. A National Study Using Spatial Analysis., David C. Currow, Samuel F. Allingham, Sonia Bird, Patsy Yates, Joanne Lewis, James P. Dawber, Kathy Eagar

Kathy Eagar

Background A range of health outcomes at a population level are related to differences in levels of social disadvantage. Understanding the impact of any such differences in palliative care is important. The aim of this study was to assess, by level of socio-economic disadvantage, referral patterns to specialist palliative care and proximity to inpatient services. Methods All inpatient and community palliative care services nationally were geocoded (using postcode) to one nationally standardised measure of socio-economic deprivation - Socio- Economic Index for Areas (SEIFA; 2006 census data). Referral to palliative care services and characteristics of referrals were described through data collected …


'If My Arms And Legs Aren't Dropping Off I'Ll Wait To See My Usual Gp!' An Analysis Of Older Patients' Attitudes To Registrars Informed By Agency Theory, Andrew D. Bonney, Sandra C. Jones, Donald C. Iverson, Christopher A. Magee Jun 2013

'If My Arms And Legs Aren't Dropping Off I'Ll Wait To See My Usual Gp!' An Analysis Of Older Patients' Attitudes To Registrars Informed By Agency Theory, Andrew D. Bonney, Sandra C. Jones, Donald C. Iverson, Christopher A. Magee

Sandra Jones

Continuity of care and trust are important in older patient-doctor relationships which impacts older patient willingess to consult registrars for chronic disease management.


Newspaper Coverage Of Drug Policy: An Analysis Of Pre-Election Reporting Of The Greens' Drug Policy In Australia, Danika Hall, Sandra C. Jones, Fiona Cowlin Jun 2013

Newspaper Coverage Of Drug Policy: An Analysis Of Pre-Election Reporting Of The Greens' Drug Policy In Australia, Danika Hall, Sandra C. Jones, Fiona Cowlin

Sandra Jones

Introduction and Aims. With the headline 'Ecstasy Over The Counter' in a popular daily newspaper, the debate on drug policy officially entered the arena of the 2003 New South Wales (Australia) State Election. The debate resurfaced in the lead-up to the 2004 Australian Federal Election. This paper analyses the pre-election coverage of drug policy issues in four Australian newspapers. Design and Methods. Four high-circulation daily newspapers were monitored for a one-month period prior to both elections and analysed for their coverage of drug policy, particularly with respect to the policy of the Greens. Results. The newspapers took different perspectives on …


Perceptions And Practices Of Adults With Asthma: A Social Cognitive Analysis, Kelly L. Andrews, Sandra C. Jones, Judy Mullan Jun 2013

Perceptions And Practices Of Adults With Asthma: A Social Cognitive Analysis, Kelly L. Andrews, Sandra C. Jones, Judy Mullan

Sandra Jones

This article describes a qualitative study that investigated the experiences, attitudes, and opinions of adults with asthma regarding self-managing their disease. Focus groups were conducted with 22 adults living in metropolitan and regional New South Wales, Australia. Key findings were that the perceived stigma of asthma, the need for social support, and the need for "asthma-friendly general practitioners" concerned participants more than formal self-management procedures such as written Asthma Action Plans and medication regimes. Social cognitive theory was used to explain the fluid relationship between persons with asthma, their environment, and their behavior in relation to self-management strategies and in …


Disease Awareness Advertisements In Australian Magazines: An Analysis Of Content And Compliance, Danika Hall, Sandra C. Jones, Donald C. Iverson Jun 2013

Disease Awareness Advertisements In Australian Magazines: An Analysis Of Content And Compliance, Danika Hall, Sandra C. Jones, Donald C. Iverson

Sandra Jones

In Australia, Direct to Consumer Advertising (DTCA) of prescription medicine is prohibited; however pharmaceutical companies can communicate directly with consumers via Disease Awareness Advertising (DAA). DAA can contain information about a disease including treatment information, but cannot mention the name of a particular product or brand. DAA is currently regulated by the industry body Medicines Australia (MA). In the current study, content analysis methodology was used to determine the extent and nature of DAA in popular Australian women’s magazines which were monitored for 12 months. Findings relating to the use of visual appeals in the imagery and rational appeals in …


Performance Analysis Of Stfc Mb-Ofdm Uwb In Wban Channels, Miftadi Sudjai, Le Chung Tran, Farzad Safaei Jun 2013

Performance Analysis Of Stfc Mb-Ofdm Uwb In Wban Channels, Miftadi Sudjai, Le Chung Tran, Farzad Safaei

Professor Farzad Safaei

This paper investigates the performance of the space-time-frequency coded (STFC) multiband orthogonal frequency division multiplexing ultra-wideband (MBOFDM UWB) system over wireless body area network (WBAN) channels, using the Alamouti code. Different MIMO configurations and different modulations are used for comparison. The effect of body directions is also assessed by simulation in this paper. Simulation results show that the proposed STFC MB-OFDM UWB system provides a significantly better BER performance, compared to the conventional MB-OFDM system, even from a reasonably low Eb/No range. The simulations also confirm that the body direction affects the system performance significantly due to the availability of …


Specific Heat And Magnetic Relaxation Analysis Of Mgb2 Bulk Samples With And Without Additives, C. Senatore, P. Lezza, R. Lortz, Olga V. Shcherbakova, Wai Kong Yeoh, S. X. Dou, R. Flukiger Jun 2013

Specific Heat And Magnetic Relaxation Analysis Of Mgb2 Bulk Samples With And Without Additives, C. Senatore, P. Lezza, R. Lortz, Olga V. Shcherbakova, Wai Kong Yeoh, S. X. Dou, R. Flukiger

Shi Xue Dou

The effects of SiC and Carbon doping on the superconducting properties of MgB2 polycrystalline samples have been analysed by means of specific heat and magnetic relaxation measurements. It is known that the addition of nanometric powders of SiC and C leads to the enhancement of Birr and Jc. However, the underlying physical mechanism is not completely understood. Magnetic relaxation measurements did not show detectable effects of both the additions on the pinning properties of MgB2. It follows that doping acts mainly introducing disorder into the superconductor and thus raising Bc2. In the case of MgB1.9C0.1, specific heat measurements show that …


Intergrain Connectivity Of Mgb2 Ceramics Studied By Impedance Analysis, C.C Wang, C Wang, Rong Zeng, S X. Dou Jun 2013

Intergrain Connectivity Of Mgb2 Ceramics Studied By Impedance Analysis, C.C Wang, C Wang, Rong Zeng, S X. Dou

Shi Xue Dou

First, by using of the conventional Rowell analysis, we demonstrated that the addition of nano BN particles can effectively eliminate MgO and pores in MgB2 resulting in a very high density and good connectivity of BN-doped MgB2. Then, another method—low-frequency dielectric impedance analysis—was introduced to characterize the properties of the grain boundaries of MgB2. A comparative impedance study was performed in the frequency range from 100 Hz to 100 MHz on pure and nano BN-doped MgB2. The study revealed some following interesting results: (1) a dielectric resonance around frequency of 108 in both samples was observed, which was argued to …


Wearable Technology For The Real-Time Analysis Of Sweat During Exercise, D Morris, B Schazmann, Y Wu, C Fay, Stephen T. Beirne, C Slater, King-Tong Lau, Gordon G. Wallace, Dermot Diamond Mar 2013

Wearable Technology For The Real-Time Analysis Of Sweat During Exercise, D Morris, B Schazmann, Y Wu, C Fay, Stephen T. Beirne, C Slater, King-Tong Lau, Gordon G. Wallace, Dermot Diamond

Gordon Wallace

-Textile based sensors which can be used to measure the chemical composition of bodily fluids represents a major advancement in the area of wearable technology. BIOTEX is an EU funded project aiming to develop such sensors with a particular interest in monitoring perspiration. A textile based fluid handling system has been developed for sample collection and transport. Sodium, conductivity and pH sensors have also been developed. This paper details the integration and testing of these sensors. Results show that the developed system can collect and analyze sweat in real time during exercise and transmit this data wirelessly to a remote …


Flicker Propagation Analysis In Distribution Networks With Embedded Generation, D Perera, L Meegahapola, S Perera, P Ciufo Feb 2013

Flicker Propagation Analysis In Distribution Networks With Embedded Generation, D Perera, L Meegahapola, S Perera, P Ciufo

Dr Philip Ciufo

Embedded generators such as wind generators can produce observable voltage fluctuations during variable wind conditions hence flicker. The flicker produced by such intermittent and fluctuating generating sources can propagate to other parts of the distribution network while creating power quality issues in distribution feeders. This study presents a flicker emission analysis for a doubly-fed induction generator (DFIG) based wind farm and investigate the pertinent factors which influence flicker propagation and attenuation in distribution feeders. Study has shown that voltage fluctuations are significantly influenced by the attenuation characteristics of various load types (i.e. constant power, impedance and current loads) connected to …


Texture Analysis Using Partially Ordered Markov Models, Jennifer Davidson, Ashit Talukder, Noel A. Cressie Feb 2013

Texture Analysis Using Partially Ordered Markov Models, Jennifer Davidson, Ashit Talukder, Noel A. Cressie

Professor Noel Cressie

Texture is a phenomenon in image data that continues to receive wide-spread interest due to its broad range of applications. The paper focuses on but one of several ways to model textures, namely, the class of stochastic texture models. the authors introduce a new spatial stochastic model called partially ordered Markov models, or POMMs. They show how POMMs are a generalization of a class of models called Markov mesh models, or MMMs, that allow an explicit closed form of the joint probability, just as do MMMs. While POMMs are a type of Markov random field model (MRF), the general MRFs …


Activity As A Unit Of Analysis For Knowledge Management Frameworks, Leoni Warne, Irena Ali, Helen Hasan Feb 2013

Activity As A Unit Of Analysis For Knowledge Management Frameworks, Leoni Warne, Irena Ali, Helen Hasan

Helen Hasan

The authors of this paper take the view that knowledge management is a set of practices for systematically adding value to the knowlege of individuals, which is generated and shaped through interaction with others. It is therefore appropriate that knowledge management research be conducted in the context of particular organisations, focusing on local activities. To that end two of the authors have conducted a four-year research program investigating the factors in organizations that enhance and enable the assimilation, generation, sharing and building of knowledge that transfonns an organization into a learning organization. Human activities in organisational contexts have been analysed …


An Activity-Theory Analysis Of Corporate Wikis, Helen M. Hasan, Charmaine C. Pfaff Feb 2013

An Activity-Theory Analysis Of Corporate Wikis, Helen M. Hasan, Charmaine C. Pfaff

Helen Hasan

Purpose: Wiki technologies, which are popular in social settings, are beginning to contribute to more flexible and participatory approaches to the exploitation of knowledge in corporate settings. Through the lens of activity theory, this paper aims to investigate contentious challenges to organizational activities that may be associated with the introduction of corporate wikis, in particular the potential democratization of knowledge work. Design/methodology/approach: From a study of several cases of corporate wiki adoption, this paper presents and interprets two representative cases sampled to provide more generalized results. Qualitative data were collected through semi-structured interviews and observation. The analysis followed a systematic …


An Activity Theory Analysis Of A Case Of It-Driven Organisational Change, Wannapa Suratmethakul, Helen Hasan Feb 2013

An Activity Theory Analysis Of A Case Of It-Driven Organisational Change, Wannapa Suratmethakul, Helen Hasan

Helen Hasan

The paper describes unexpected problems encountered in the automation of a scheduling process using an IT application already in use in other similar organisations. A grounded theory approach was used to collect and categorise data on the case. Activity Theory was then used to analyse the attempt by management to implement organisational change through the introduction of the system. The findings suggest that it is inadvisable to impose organisational change through the introduction of a complex IT system, particularly when this disrupts entrenched decision-making processes of the organisation.


Kinematic Analysis Of Electroactive Polymer Actuators As Soft And Smart Structures With More Dof Than Inputs, Rahim Mutlu, Gursel Alici, Weihua Li Feb 2013

Kinematic Analysis Of Electroactive Polymer Actuators As Soft And Smart Structures With More Dof Than Inputs, Rahim Mutlu, Gursel Alici, Weihua Li

Gursel Alici

Electroactive polymer (EAP) actuators have been attracting the attention of researchers due to their muscle-like behaviour and unusual properties. Several modelling methods have been proposed to understand their mechanical, chemical, electrical behaviours or ‘electro-chemo-mechanical’ behaviour. However, estimating the whole shape or configuration of the EAP actuators has always been challenging due to their highly non-linear bending behaviour. This paper reports on an effective method to estimate the whole shape deflection of the EAP actuators by employing a so-called backbone approach. Tri-layer configured polypyrrole (PPy) based EAP actuators were used as a soft and smart structure with more degrees of freedom …


Analysis Of Particle Motion In A Micro-Fluidic Dielectrophoretic Device, Weihua Li, X Z. Zhang Feb 2013

Analysis Of Particle Motion In A Micro-Fluidic Dielectrophoretic Device, Weihua Li, X Z. Zhang

Professor Weihua Li

Interdigitated microelectrodes have found wide applications in manipulating and/or separating biological particles due to their simple structure and easy implementation. Particle behaviors in such interdigitated microelectrode devices are affected by a number of factors, including particle size, electrical potential, chamber geometry and dielectric properties. This paper presents systematical simulation study of particle behaviors in these devices by considering all these influencing factors. A case study is presented to separate different particles using both positive and negative DEP.


Kinematic Analysis Of Electroactive Polymer Actuators As Soft And Smart Structures With More Dof Than Inputs, Rahim Mutlu, Gursel Alici, Weihua Li Feb 2013

Kinematic Analysis Of Electroactive Polymer Actuators As Soft And Smart Structures With More Dof Than Inputs, Rahim Mutlu, Gursel Alici, Weihua Li

Professor Weihua Li

Electroactive polymer (EAP) actuators have been attracting the attention of researchers due to their muscle-like behaviour and unusual properties. Several modelling methods have been proposed to understand their mechanical, chemical, electrical behaviours or ‘electro-chemo-mechanical’ behaviour. However, estimating the whole shape or configuration of the EAP actuators has always been challenging due to their highly non-linear bending behaviour. This paper reports on an effective method to estimate the whole shape deflection of the EAP actuators by employing a so-called backbone approach. Tri-layer configured polypyrrole (PPy) based EAP actuators were used as a soft and smart structure with more degrees of freedom …


A Spatial Analysis Of Multivariate Output From Regional Climate Models, Stephan Sain, Reinhard Furrer, Noel A. Cressie Feb 2013

A Spatial Analysis Of Multivariate Output From Regional Climate Models, Stephan Sain, Reinhard Furrer, Noel A. Cressie

Professor Noel Cressie

Climate models have become an important tool in the study of climate and climate change, and ensemble experiments consisting of multiple climate-model runs are used in studying and quantifying the uncertainty in climate-model output. However, there are often only a limited number of model runs available for a particular experiment, and one of the statistical challenges is to characterize the distribution of the model output. To that end, we have developed a multivariate hierarchical approach, at the heart of which is a new representation of a multivariate Markov random field. This approach allows for flexible modeling of the multivariate spatial …


A Spatial Analysis Of Variance Applied To Soil-Water Infiltration, C Gotway, Noel A. Cressie Feb 2013

A Spatial Analysis Of Variance Applied To Soil-Water Infiltration, C Gotway, Noel A. Cressie

Professor Noel Cressie

A spatial analysis of variance uses the spatial dependence among the observations to modify the usual interference procedures associated with a statistical linear model. When spatial correlation is present, the usual tests for presence of treatment effects may no longer be valid, and erroneous conclusions may result from assuming that the usual F ratios are F distributed. This is demonstrated using a spatial analysis of soil-water infiltration data. Emphasis is placed on modeling the spatial dependence structure with geostatistical techniques, and this spatial dependence structure is then used to test hypotheses about fixed effects using a nested linear model. -Authors


Bayesian Hierarchical Analysis Of Minefield Data, Noel A. Cressie, Andrew B. Lawson Feb 2013

Bayesian Hierarchical Analysis Of Minefield Data, Noel A. Cressie, Andrew B. Lawson

Professor Noel Cressie

Based on remote sensing of a potential minefield, point locations are identified, some of which may not be mines. The mines and mine-like objects are to be distinguished based on their point patterns, although it must be emphasized that all we see is the superposition of their locations. In this paper, we construct a hierarchical spatial point-process model that accounts for the different patterns of mines and mine-like objects and uses posterior analysis to distinguish between them. Our Bayesian approach is applied to COBRA image data obtained from the NSWC Coastal Systems Station, Dahlgren Division, Panama City, Florida. 2003 Copyright …


A Robust-Resistant Spatial Analysis Of Soil Water Infiltration., Noel A. Cressie, R Horton Feb 2013

A Robust-Resistant Spatial Analysis Of Soil Water Infiltration., Noel A. Cressie, R Horton

Professor Noel Cressie

Concentrates on estimating the spatial correlations between soil water infiltration observations, with special emphasis on resistant methods to remove nonstationarity. After this removal, robust semivariogram estimators are used to examine the spatial dependencies for various tillage treatments. There is some indication that infiltration characteristics inherit different types of spatial dependency, depending on the tillage treatment applied.-from Authors


Northwest Indiana Entrepreneurial Opportunity Survey Analysis, Ziona Austrian, Merissa Piazza, Eli Auerbach, Sunjoo Park Jan 2013

Northwest Indiana Entrepreneurial Opportunity Survey Analysis, Ziona Austrian, Merissa Piazza, Eli Auerbach, Sunjoo Park

Ziona Austrian

This survey report is associated with "Northwest Indiana Regional Analysis: Demographics, Economy, entrepreneurship and Innovation"


Northeast Indiana Regional Analysis: Demographics, Economy, Entrepreneurship And Innovation, Ziona Austrian, Merissa Piazza, Eli Auerbach, Sunjoo Park, Joan Chase Jan 2013

Northeast Indiana Regional Analysis: Demographics, Economy, Entrepreneurship And Innovation, Ziona Austrian, Merissa Piazza, Eli Auerbach, Sunjoo Park, Joan Chase

Ziona Austrian

This report is associated with "Northeast Indiana Entrepreneurial Opportunity Survey Analysis"