Performance evaluation of the dependable properties of a body area wireless sensor network
- Balasubramanian, Venki, Stranieri, Andrew
- Authors: Balasubramanian, Venki , Stranieri, Andrew
- Date: 2014
- Type: Text , Conference paper
- Relation: 2014 International Conference on Reliabilty, Optimization, & Information Technology (Icroit 2014); Faridabad, India; 6th-8th February 2014 p. 229-234
- Full Text:
- Reviewed:
- Description: Body Area Wireless Sensor Networks (BAWSNs) are self-organizing networks capable of monitoring health intrinsic data of a patient. BAWSNs extended with a health care application can be used to perform medical assessments by remotely monitoring patients. The accuracy of medical assessments fundamentally depends on the correctness of the data received from the BAWSN. However, data errors may arise at the sensor or during transmission across the wireless sensor network. Therefore, it is imperative to measure the health intrinsic data of a patient precisely. The formulated measurable properties in our work precisely measure the performance of the BAWSN in a remote Healthcare Monitoring Application (HMA). In this paper, we collated various performances using the measurable properties in our real-time test-bed and presented a comprehensive evaluation of these properties in a BAWSN.
- Authors: Balasubramanian, Venki , Stranieri, Andrew
- Date: 2014
- Type: Text , Conference paper
- Relation: 2014 International Conference on Reliabilty, Optimization, & Information Technology (Icroit 2014); Faridabad, India; 6th-8th February 2014 p. 229-234
- Full Text:
- Reviewed:
- Description: Body Area Wireless Sensor Networks (BAWSNs) are self-organizing networks capable of monitoring health intrinsic data of a patient. BAWSNs extended with a health care application can be used to perform medical assessments by remotely monitoring patients. The accuracy of medical assessments fundamentally depends on the correctness of the data received from the BAWSN. However, data errors may arise at the sensor or during transmission across the wireless sensor network. Therefore, it is imperative to measure the health intrinsic data of a patient precisely. The formulated measurable properties in our work precisely measure the performance of the BAWSN in a remote Healthcare Monitoring Application (HMA). In this paper, we collated various performances using the measurable properties in our real-time test-bed and presented a comprehensive evaluation of these properties in a BAWSN.
Resilience in a aquatic ecosystems : Developing predictive models to explain the effects of anthropogenic stressors on Murray-Darling Basin billabongs
- Reid, Michael, Gell, Peter, Davidson, Thomas, Sayer, Carl, Tibby, John, Fluin, Jennie
- Authors: Reid, Michael , Gell, Peter , Davidson, Thomas , Sayer, Carl , Tibby, John , Fluin, Jennie
- Date: 2014
- Type: Text , Conference paper
- Relation: Symposium on Australia-China Wetland Network Research Partnership; Nanjing Institute of Geography and Limnology Chinese Academy of Sciences (NIGLAS) Nanjing, China; 23rd-28th December 2014 p. 61-67
- Full Text:
- Reviewed:
- Description: Freshwater ecosystems are among the most threatened in the world (MEA 2005) and have been identified as one of the ten Australian ecosystems most vulnerable to tipping points. The floodplain lakes and wetlands (billabongs) of the Murray-Darling Basin (MDB) are hotspots of productivity and diversity and provide important breeding, feeding and refuge habitat for a range of floodplain river biota, as well as important ecosystem goods and services by way of flood mitigation, nutrient cycling and sediment trapping. Nonetheless, MDB billabongs are threatened by water resource and agricultural development and climate change. In recognition of these threats, water dependent ecosystems of the MDB are currently subject to expensive and controversial management measures involving water buy backs estimated to cost up to $30 billion and the subsequent delivery of environmental water. The need to understand the critical drivers of change and the internal system interactions that underlie ecosystem responses in floodplain river ecosystems has never been greater. This project will develop ecosystem response models that will not only identify the critical threatening drivers, but also provide the guidance necessary to rehabilitate these important ecosystems.
- Authors: Reid, Michael , Gell, Peter , Davidson, Thomas , Sayer, Carl , Tibby, John , Fluin, Jennie
- Date: 2014
- Type: Text , Conference paper
- Relation: Symposium on Australia-China Wetland Network Research Partnership; Nanjing Institute of Geography and Limnology Chinese Academy of Sciences (NIGLAS) Nanjing, China; 23rd-28th December 2014 p. 61-67
- Full Text:
- Reviewed:
- Description: Freshwater ecosystems are among the most threatened in the world (MEA 2005) and have been identified as one of the ten Australian ecosystems most vulnerable to tipping points. The floodplain lakes and wetlands (billabongs) of the Murray-Darling Basin (MDB) are hotspots of productivity and diversity and provide important breeding, feeding and refuge habitat for a range of floodplain river biota, as well as important ecosystem goods and services by way of flood mitigation, nutrient cycling and sediment trapping. Nonetheless, MDB billabongs are threatened by water resource and agricultural development and climate change. In recognition of these threats, water dependent ecosystems of the MDB are currently subject to expensive and controversial management measures involving water buy backs estimated to cost up to $30 billion and the subsequent delivery of environmental water. The need to understand the critical drivers of change and the internal system interactions that underlie ecosystem responses in floodplain river ecosystems has never been greater. This project will develop ecosystem response models that will not only identify the critical threatening drivers, but also provide the guidance necessary to rehabilitate these important ecosystems.
Rotational traction testing : How can we improve the current test device?
- Twomey, Dara, Connell, Monique, Petrass, Lauren
- Authors: Twomey, Dara , Connell, Monique , Petrass, Lauren
- Date: 2014
- Type: Text , Conference paper
- Relation: 2014 10th Conference of the International Sports Engineering Association, ISEA 2014; Sheffield, United Kingdom; 14th-17th July 2014; published in Procedia Engineering, Vol. 72, p. 919-924
- Full Text:
- Reviewed:
- Description: Rotational resistance is an important sports surface property in optimising both performance and safety for participants. Despite various attempts to create valid devices to measure the rotational traction, the Studded Boot Apparatus (SBA) originally developed in 1975 is still used in the synthetic turf standards of many governing bodies of sport. In addition to validity limitations, poor operator reliability of the SBA has been reported and it was postulated that the manual nature of the device contributed significantly to this result. Therefore, the aim of this paper is to present data on the automation of the SBA and to discuss the reliability and validity issues of the device. An automated version of the SBA was developed called the UB Turf Tester (UBTT) and data was collected by ten inexperienced operators using the original SBA and the UBTT. Testing was undertaken on a synthetic turf and each operator completed ten trials with each device. Despite a slightly greater peak traction value for the UBTT, there was no significant difference between the peak traction for the two devices, F 1,2 = 0.341, p = 0.57. Greater reliability was found between operators for the UB Turf Tester. Given that the SBA is still commonly used to comply with standards, achieving the highest level of intra- and inter-operator reliability is both desirable and invaluable. However, the research on the validity of the device also needs to continue. Interestingly, limitations of the device were identified when it was first developed but very few adaptations have been implemented since then. Undoubtedly, the interaction between the human and the surface is a complex phenomenon but the weight force, the level of penetration, the pattern, shape and position of the cleats and the possibility of measuring rotational stiffness rather than peak traction all require further discussion and investigation.
- Authors: Twomey, Dara , Connell, Monique , Petrass, Lauren
- Date: 2014
- Type: Text , Conference paper
- Relation: 2014 10th Conference of the International Sports Engineering Association, ISEA 2014; Sheffield, United Kingdom; 14th-17th July 2014; published in Procedia Engineering, Vol. 72, p. 919-924
- Full Text:
- Reviewed:
- Description: Rotational resistance is an important sports surface property in optimising both performance and safety for participants. Despite various attempts to create valid devices to measure the rotational traction, the Studded Boot Apparatus (SBA) originally developed in 1975 is still used in the synthetic turf standards of many governing bodies of sport. In addition to validity limitations, poor operator reliability of the SBA has been reported and it was postulated that the manual nature of the device contributed significantly to this result. Therefore, the aim of this paper is to present data on the automation of the SBA and to discuss the reliability and validity issues of the device. An automated version of the SBA was developed called the UB Turf Tester (UBTT) and data was collected by ten inexperienced operators using the original SBA and the UBTT. Testing was undertaken on a synthetic turf and each operator completed ten trials with each device. Despite a slightly greater peak traction value for the UBTT, there was no significant difference between the peak traction for the two devices, F 1,2 = 0.341, p = 0.57. Greater reliability was found between operators for the UB Turf Tester. Given that the SBA is still commonly used to comply with standards, achieving the highest level of intra- and inter-operator reliability is both desirable and invaluable. However, the research on the validity of the device also needs to continue. Interestingly, limitations of the device were identified when it was first developed but very few adaptations have been implemented since then. Undoubtedly, the interaction between the human and the surface is a complex phenomenon but the weight force, the level of penetration, the pattern, shape and position of the cleats and the possibility of measuring rotational stiffness rather than peak traction all require further discussion and investigation.
Tandem research: Analysis as data for self-study research
- Gervasoni, Ann, Brandenburg, Robyn
- Authors: Gervasoni, Ann , Brandenburg, Robyn
- Date: 2014
- Type: Text , Conference paper
- Relation: Changing practices for changing times: Past, present and future possibilities for self-study research; Herstmonceux Castle, East Sussex August 3rd-7th; published in Proceedings of the Tenth International Conference on Self-Study of Teacher Education Practices. p. 94-99
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- Reviewed:
- Description: This paper explores the findings of self-study research (LaBoskey, 2004; Loughran, 2006; Samaras, 2010; Samaras & Freese, 2006) that emerged from a separate Teacher Identify research project in which both authors were engaged. The Teacher Identity research project explored the professional identities of 192 pre-service teachers who were enrolled in the first year of their course at two Universities in a regional Australian city. As part of the data collection phase of the Teacher Identify research in 2010, we invited the pre-service teachers to produce a visual representation of a teacher. The representations were produced in the first weeks of their respective courses to minimize any influence of the program and our teaching, on their initial visual representations of themselves as a teacher. It was during the sorting and coding of these visual representations that we realised we had initiated a self-study without deliberately setting out to do so. The process of data analysis had become a context that deeply challenged our assumptions about our teaching and our students’ learning. We had both ‘turned to self’ (Bullough & Pinnegar, 2001). This realisation prompted us to formalise the self-study research that was emerging and then to purposefully collect data about the critical moments (Brandenburg, 2008; Brandenburg & Gervasoni, 2012; Kosnik, 2001; Tripp, 1993) that arose as we analysed the Teacher Identify research data. Reflecting ‘in and on action’ (Schön, 1985; 1991) provided the framework to enable us to identify critical moments in our analysis of the Teacher Identity data and to further understand the implications of this new knowledge for our practice as teacher educators, and for self-study methodology.
- Authors: Gervasoni, Ann , Brandenburg, Robyn
- Date: 2014
- Type: Text , Conference paper
- Relation: Changing practices for changing times: Past, present and future possibilities for self-study research; Herstmonceux Castle, East Sussex August 3rd-7th; published in Proceedings of the Tenth International Conference on Self-Study of Teacher Education Practices. p. 94-99
- Full Text:
- Reviewed:
- Description: This paper explores the findings of self-study research (LaBoskey, 2004; Loughran, 2006; Samaras, 2010; Samaras & Freese, 2006) that emerged from a separate Teacher Identify research project in which both authors were engaged. The Teacher Identity research project explored the professional identities of 192 pre-service teachers who were enrolled in the first year of their course at two Universities in a regional Australian city. As part of the data collection phase of the Teacher Identify research in 2010, we invited the pre-service teachers to produce a visual representation of a teacher. The representations were produced in the first weeks of their respective courses to minimize any influence of the program and our teaching, on their initial visual representations of themselves as a teacher. It was during the sorting and coding of these visual representations that we realised we had initiated a self-study without deliberately setting out to do so. The process of data analysis had become a context that deeply challenged our assumptions about our teaching and our students’ learning. We had both ‘turned to self’ (Bullough & Pinnegar, 2001). This realisation prompted us to formalise the self-study research that was emerging and then to purposefully collect data about the critical moments (Brandenburg, 2008; Brandenburg & Gervasoni, 2012; Kosnik, 2001; Tripp, 1993) that arose as we analysed the Teacher Identify research data. Reflecting ‘in and on action’ (Schön, 1985; 1991) provided the framework to enable us to identify critical moments in our analysis of the Teacher Identity data and to further understand the implications of this new knowledge for our practice as teacher educators, and for self-study methodology.
Targeting, Tailoring, Timing - How the smaller regional Victorian TAFEs are changing to meet the need of HE students studying in their regions together.
- Menzies, Joanne, Lange, Nancy
- Authors: Menzies, Joanne , Lange, Nancy
- Date: 2014
- Type: Text , Conference paper
- Relation: Paper presented at ALIA National 2014 conference : Together we are stronger
- Full Text:
- Reviewed:
- Description: INTRODUCTION The Dual Sector Partnership (DSP) Project was set up to deliver HE programs to regional students through their own local TAFE Institutes. The model of blended delivery allowed the students to study online but keep a local connection with lecturers and support staff based at their home institutes. Many students articulated into the degree programs from TAFE diplomas. The transition from a vocational environment into a HE environment presented challenges for these students. They were time poor, often in middle to senior management roles, working full time and managing families. Significant barriers existed in their relative isolation from direct assistance by studying online and lack of underlying academic literacies required for HE study. Students had access to both UB library resources online, but also their local TAFE libraries for support. In this way we reflected the “blended delivery” concept in library support. METHODS Project funds provided a local library collection- building program and an Information Librarian role (Jo Menzies). Jo works with the partners identify resources and practices that will help build capacity for the librarians, most of whom had previously not been required to deliver Information Literacy at the HE level. The libraries have devised and tested a number of strategies to better connect with these largely, online students. Strategies include the development of some very tailored and targeted sessions delivered outside normal library hours and requiring a very tight connection between teaching, library and learning skills staff. Other strategies include the development of an innovative and interactive tool to support referencing instruction, (one of the biggest issues for this cohort of students), active presence in student Moodle shells so students can interact with the library in their study space, development of student-generated sessions where students request specific session topics, and a preferred time to meet with their support librarian. RESULTS Strategies have had varying degrees of success. Student feedback has been positive, but major issues are making contact with this cohort and finding the right time.. Online resources are available but their skills with technology often prevent them from accessing such resources without support and instruction on effective use. One of the important results from this project to date is that delivery of Information Literacy for this cohort is all about Targeting, Tailoring and Timing (the 3 T’s). CONCLUSIONS We have a way to go, but we have clear goals to work towards, including the development of strong local connections between the library, teaching and study support staff. For this mature age group support works best when online is complimented by face to face support. RELEVANCE For the smaller regional TAFEs having to provide Information Literacy to HE students is a new thing, but not only are they HE, this cohort is mature age, not based on campus and come into the program with significant gaps in their academic literacies and technological skills. As a result each TAFE Institute library has responded locally in customising their delivery to suit the DSP cohort.
- Authors: Menzies, Joanne , Lange, Nancy
- Date: 2014
- Type: Text , Conference paper
- Relation: Paper presented at ALIA National 2014 conference : Together we are stronger
- Full Text:
- Reviewed:
- Description: INTRODUCTION The Dual Sector Partnership (DSP) Project was set up to deliver HE programs to regional students through their own local TAFE Institutes. The model of blended delivery allowed the students to study online but keep a local connection with lecturers and support staff based at their home institutes. Many students articulated into the degree programs from TAFE diplomas. The transition from a vocational environment into a HE environment presented challenges for these students. They were time poor, often in middle to senior management roles, working full time and managing families. Significant barriers existed in their relative isolation from direct assistance by studying online and lack of underlying academic literacies required for HE study. Students had access to both UB library resources online, but also their local TAFE libraries for support. In this way we reflected the “blended delivery” concept in library support. METHODS Project funds provided a local library collection- building program and an Information Librarian role (Jo Menzies). Jo works with the partners identify resources and practices that will help build capacity for the librarians, most of whom had previously not been required to deliver Information Literacy at the HE level. The libraries have devised and tested a number of strategies to better connect with these largely, online students. Strategies include the development of some very tailored and targeted sessions delivered outside normal library hours and requiring a very tight connection between teaching, library and learning skills staff. Other strategies include the development of an innovative and interactive tool to support referencing instruction, (one of the biggest issues for this cohort of students), active presence in student Moodle shells so students can interact with the library in their study space, development of student-generated sessions where students request specific session topics, and a preferred time to meet with their support librarian. RESULTS Strategies have had varying degrees of success. Student feedback has been positive, but major issues are making contact with this cohort and finding the right time.. Online resources are available but their skills with technology often prevent them from accessing such resources without support and instruction on effective use. One of the important results from this project to date is that delivery of Information Literacy for this cohort is all about Targeting, Tailoring and Timing (the 3 T’s). CONCLUSIONS We have a way to go, but we have clear goals to work towards, including the development of strong local connections between the library, teaching and study support staff. For this mature age group support works best when online is complimented by face to face support. RELEVANCE For the smaller regional TAFEs having to provide Information Literacy to HE students is a new thing, but not only are they HE, this cohort is mature age, not based on campus and come into the program with significant gaps in their academic literacies and technological skills. As a result each TAFE Institute library has responded locally in customising their delivery to suit the DSP cohort.
Understanding how the components of a synthetic turf system contribute to increased surface temperature C3 - Procedia Engineering
- Petrass, Lauren, Twomey, Dara, Harvey, Jack
- Authors: Petrass, Lauren , Twomey, Dara , Harvey, Jack
- Date: 2014
- Type: Text , Conference paper
- Relation: 2014 10th Conference of the International Sports Engineering Association, ISEA 2014 Vol. 72, p. 943-948
- Full Text:
- Reviewed:
- Description: Surface temperatures of synthetic turf have become a factor of growing interest and concern, particularly in warmer regions like Australia. However, it is unclear which components of the synthetic turf system contribute to surface temperature. The aim of this paper was to compare the surface temperature of 34 different synthetic turf products that were exposed to the same environmental conditions to ascertain which components of the synthetic turf system and which environmental factors contributed to increased surface temperature. A total of 6,120 observations were taken on the 34 products over the summer months, giving 30 observations for each of the variables on each product. An analysis of covariance (ANCOVA) indicated that the type of infill and shockpad had small-medium, but significant, effects on surface temperature (p<0.001 and p=0.003, respectively), and the interaction between shockpad and tuft gauge was also significant (p=0.047). Level of solar radiation, ambient temperature and relative humidity (p<0.001 in all instances) were the only environmental variables that significantly influenced surface temperature. These findings confirm that both the composition of the synthetic turf system and environmental factors contribute to synthetic turf surface temperature, thus providing important information for synthetic turf manufacturers developing new cool climate products, or for local government authorities selecting products and/or informing safe play for end-users.
- Description: E1
- Authors: Petrass, Lauren , Twomey, Dara , Harvey, Jack
- Date: 2014
- Type: Text , Conference paper
- Relation: 2014 10th Conference of the International Sports Engineering Association, ISEA 2014 Vol. 72, p. 943-948
- Full Text:
- Reviewed:
- Description: Surface temperatures of synthetic turf have become a factor of growing interest and concern, particularly in warmer regions like Australia. However, it is unclear which components of the synthetic turf system contribute to surface temperature. The aim of this paper was to compare the surface temperature of 34 different synthetic turf products that were exposed to the same environmental conditions to ascertain which components of the synthetic turf system and which environmental factors contributed to increased surface temperature. A total of 6,120 observations were taken on the 34 products over the summer months, giving 30 observations for each of the variables on each product. An analysis of covariance (ANCOVA) indicated that the type of infill and shockpad had small-medium, but significant, effects on surface temperature (p<0.001 and p=0.003, respectively), and the interaction between shockpad and tuft gauge was also significant (p=0.047). Level of solar radiation, ambient temperature and relative humidity (p<0.001 in all instances) were the only environmental variables that significantly influenced surface temperature. These findings confirm that both the composition of the synthetic turf system and environmental factors contribute to synthetic turf surface temperature, thus providing important information for synthetic turf manufacturers developing new cool climate products, or for local government authorities selecting products and/or informing safe play for end-users.
- Description: E1
A performance review of recent corner detectors
- Awrangjeb, Mohammad, Lu, Guojun
- Authors: Awrangjeb, Mohammad , Lu, Guojun
- Date: 2013
- Type: Text , Conference paper
- Relation: International Conference on Digital Image Computing: Techniques and Applications, 26 November 2013 to 28 November 2013 p. 157-164
- Full Text:
- Reviewed:
- Description: Contour-based corner detectors directly or indirectly estimate a significance measure (eg, curvature) on the points of a planar curve and select the curvature extrema points as corners. A number of promising contour-based corner detectors have recently been proposed. They mainly differ in how the curvature is estimated on each point of the given curve. As the curvature on a digital curve can only be approximated, it is important to estimate a curvature that remains stable against significant noises, for example, geometric transformations and compression, on the curve. Moreover, in many applications, for instance, in content-based image retrieval, a fast corner detector is a prerequisite. So, it is also a primary characteristic that how much time a corner detector takes for corner detection in a given image. In addition, different authors evaluated their detectors on different platforms using different evaluation systems. Evaluation systems that depend on human judgements and visual identification of corners are manual and too subjective. Application of a manual system on a large test database will be expensive. Therefore, it is important to evaluate the detectors on a common platform using an automatic evaluation system. This paper first reviews six most recent and highly performed corner detectors and analyse their theoretical running time. Then it uses an automatic evaluation system to analyse their performance. Both the robustness to noise and efficiency are estimated to rank the detectors.
- Authors: Awrangjeb, Mohammad , Lu, Guojun
- Date: 2013
- Type: Text , Conference paper
- Relation: International Conference on Digital Image Computing: Techniques and Applications, 26 November 2013 to 28 November 2013 p. 157-164
- Full Text:
- Reviewed:
- Description: Contour-based corner detectors directly or indirectly estimate a significance measure (eg, curvature) on the points of a planar curve and select the curvature extrema points as corners. A number of promising contour-based corner detectors have recently been proposed. They mainly differ in how the curvature is estimated on each point of the given curve. As the curvature on a digital curve can only be approximated, it is important to estimate a curvature that remains stable against significant noises, for example, geometric transformations and compression, on the curve. Moreover, in many applications, for instance, in content-based image retrieval, a fast corner detector is a prerequisite. So, it is also a primary characteristic that how much time a corner detector takes for corner detection in a given image. In addition, different authors evaluated their detectors on different platforms using different evaluation systems. Evaluation systems that depend on human judgements and visual identification of corners are manual and too subjective. Application of a manual system on a large test database will be expensive. Therefore, it is important to evaluate the detectors on a common platform using an automatic evaluation system. This paper first reviews six most recent and highly performed corner detectors and analyse their theoretical running time. Then it uses an automatic evaluation system to analyse their performance. Both the robustness to noise and efficiency are estimated to rank the detectors.
A review on chemical diagnosis techniques for transformer paper insulation degradation
- Abu Bakar, Norazhar, Abu Siada, Ahmed, Islam, Syed
- Authors: Abu Bakar, Norazhar , Abu Siada, Ahmed , Islam, Syed
- Date: 2013
- Type: Text , Conference proceedings , Conference paper
- Relation: 2013 Australasian Universities Power Engineering Conference, AUPEC 2013; Hobart, Australia; 29th September-3rd October 2013 p. 1-6
- Full Text:
- Reviewed:
- Description: Energized parts within power transformer are isolated using paper insulation and are immersed in insulating oil. Hence, transformer oil and paper insulation are essential sources to detect incipient and fast developing power transformer faults. Several chemical diagnoses techniques are developed to examine the condition of paper insulation such as degree of polymerization, carbon oxides, furanic compounds and methanol. The principle and limitation of these diagnoses are discussed and compared in this paper.
- Authors: Abu Bakar, Norazhar , Abu Siada, Ahmed , Islam, Syed
- Date: 2013
- Type: Text , Conference proceedings , Conference paper
- Relation: 2013 Australasian Universities Power Engineering Conference, AUPEC 2013; Hobart, Australia; 29th September-3rd October 2013 p. 1-6
- Full Text:
- Reviewed:
- Description: Energized parts within power transformer are isolated using paper insulation and are immersed in insulating oil. Hence, transformer oil and paper insulation are essential sources to detect incipient and fast developing power transformer faults. Several chemical diagnoses techniques are developed to examine the condition of paper insulation such as degree of polymerization, carbon oxides, furanic compounds and methanol. The principle and limitation of these diagnoses are discussed and compared in this paper.
A technique for ranking friendship closeness in social networking services
- Sun, Zhaohao, Yearwood, John, Firmin, Sally
- Authors: Sun, Zhaohao , Yearwood, John , Firmin, Sally
- Date: 2013
- Type: Text , Conference paper
- Relation: 24th Australasian Conference on Information Systems (ACIS) p. 1-9
- Full Text:
- Reviewed:
- Description: The concept of friend and friendship are critical to both theoretical and empirical studies of social relations, social media and social networks. Measuring the closeness among friends is a big issue for developing online social networking services (SNS) such as Facebook. This paper will address this issue by proposing a technique for ranking friendship closeness in SNS. The technique consists of an algorithm for ranking need-driven friendship closeness and an algorithm for behaviour-based friendship closeness in online social networking sites. The former is based on Maslow’s hierarchy of needs, while the latter is based on behaviours of users on Facebook and TOPSIS. Examples provided illustrate the viability of the proposed algorithms. The research in this paper shows that ranking friendship closeness will facilitate understanding of needs and behaviours of friends and of friendships in SNS. The proposed approach will facilitate research and development of social media, social commerce, social networks, and SN
- Authors: Sun, Zhaohao , Yearwood, John , Firmin, Sally
- Date: 2013
- Type: Text , Conference paper
- Relation: 24th Australasian Conference on Information Systems (ACIS) p. 1-9
- Full Text:
- Reviewed:
- Description: The concept of friend and friendship are critical to both theoretical and empirical studies of social relations, social media and social networks. Measuring the closeness among friends is a big issue for developing online social networking services (SNS) such as Facebook. This paper will address this issue by proposing a technique for ranking friendship closeness in SNS. The technique consists of an algorithm for ranking need-driven friendship closeness and an algorithm for behaviour-based friendship closeness in online social networking sites. The former is based on Maslow’s hierarchy of needs, while the latter is based on behaviours of users on Facebook and TOPSIS. Examples provided illustrate the viability of the proposed algorithms. The research in this paper shows that ranking friendship closeness will facilitate understanding of needs and behaviours of friends and of friendships in SNS. The proposed approach will facilitate research and development of social media, social commerce, social networks, and SN
A theoretical framework to examine the judgement process of accountants
- Authors: Faux, Jeffrey
- Date: 2013
- Type: Text , Conference paper
- Relation: 7th Asia Pacific Interdisciplinary Research in Accounting Conference p. 1-18
- Full Text: false
- Reviewed:
- Description: The cognitive concept of subjective user-orientated relevance is consistent with the description of accounting as a socio-technical information and communication system that is influenced by the mental processes and cognitive abilities of accountants. The purpose of this paper is the development of a theoretical framework to examine accountants’ judgment process as it relates to biological assets and to empirically test the attributes and constitution of useful information in the preparation of financial statements. A questionnaire is considered the most appropriate approach in this instance to collect data for this study as it is a more efficient means of obtaining responses from a large group of accountants located throughout Malaysia. The respondents generally believe that biological assets should be measured at current market value as it would provide relevant and useful information for investment decisions. However, there is a concern about the reliability of the information given the subjectivity involved in the measurement process. The survey elicits attitudes and opinions of the respondents encapsulated in the survey vignette and are therefore perceptions of respondents to a quasi-real situation. This study provides evidence supporting the conundrum facing the accounting profession concerning relevant information for decision purposes and the conflicting reliability of the information
- Authors: Faux, Jeffrey
- Date: 2013
- Type: Text , Conference paper
- Relation: 7th Asia Pacific Interdisciplinary Research in Accounting Conference p. 1-18
- Full Text: false
- Reviewed:
- Description: The cognitive concept of subjective user-orientated relevance is consistent with the description of accounting as a socio-technical information and communication system that is influenced by the mental processes and cognitive abilities of accountants. The purpose of this paper is the development of a theoretical framework to examine accountants’ judgment process as it relates to biological assets and to empirically test the attributes and constitution of useful information in the preparation of financial statements. A questionnaire is considered the most appropriate approach in this instance to collect data for this study as it is a more efficient means of obtaining responses from a large group of accountants located throughout Malaysia. The respondents generally believe that biological assets should be measured at current market value as it would provide relevant and useful information for investment decisions. However, there is a concern about the reliability of the information given the subjectivity involved in the measurement process. The survey elicits attitudes and opinions of the respondents encapsulated in the survey vignette and are therefore perceptions of respondents to a quasi-real situation. This study provides evidence supporting the conundrum facing the accounting profession concerning relevant information for decision purposes and the conflicting reliability of the information
An interesting cryptography study based on knapsack problem
- Authors: Ruan, Ning
- Date: 2013
- Type: Text , Conference paper
- Relation: Proceedings - UKSim 15th International Conference on Computer Modelling and Simulation, UKSim 2013 p. 330-334
- Full Text:
- Reviewed:
- Description: Cryptography is an art that has been practised through the centuries. Interest in the applications of the knapsack problem to cryptography has arisen with the advent of public key cryptography. The knapsack problem is well documented problem and all research into its properties have lead to the conjecture that it is difficult to solve. In this paper the canonical duality theory is presented for solving general knapsack problem. By using the canonical dual transformation, the integer programming problem can be converted into a continuous canonical dual problem with zero duality gap. The optimality criterion are also discussed. Numerical examples show the efficiency of the method. © 2013 IEEE.
- Authors: Ruan, Ning
- Date: 2013
- Type: Text , Conference paper
- Relation: Proceedings - UKSim 15th International Conference on Computer Modelling and Simulation, UKSim 2013 p. 330-334
- Full Text:
- Reviewed:
- Description: Cryptography is an art that has been practised through the centuries. Interest in the applications of the knapsack problem to cryptography has arisen with the advent of public key cryptography. The knapsack problem is well documented problem and all research into its properties have lead to the conjecture that it is difficult to solve. In this paper the canonical duality theory is presented for solving general knapsack problem. By using the canonical dual transformation, the integer programming problem can be converted into a continuous canonical dual problem with zero duality gap. The optimality criterion are also discussed. Numerical examples show the efficiency of the method. © 2013 IEEE.
Building roof plane extraction from LIDAR data
- Awrangjeb, Mohammad, Lu, Guojun
- Authors: Awrangjeb, Mohammad , Lu, Guojun
- Date: 2013
- Type: Text , Conference paper
- Relation: 2013 International Conference on Digital Image Computing: Techniques and Applications (DICTA)
- Full Text:
- Reviewed:
- Description: This paper presents a new segmentation technique to use LIDAR point cloud data for automatic extraction of building roof planes. The raw LIDAR points are first classified into two major groups: ground and non-ground points. The ground points are used to generate a 'building mask' in which the black areas represent the ground where there are no laser returns below a certain height. The non-ground points are segmented to extract the planar roof segments. First, the building mask is divided into small grid cells. The cells containing the black pixels are clustered such that each cluster represents an individual building or tree. Second, the non-ground points within a cluster are segmented based on their coplanarity and neighbourhood relations. Third, the planar segments are refined using a rule-based procedure that assigns the common points among the planar segments to the appropriate segments. Finally, another rule-based procedure is applied to remove tree planes which are generally small in size and randomly oriented. Experimental results on three Australian sites have shown that the proposed method offers high building detection and roof plane extraction rates.
- Authors: Awrangjeb, Mohammad , Lu, Guojun
- Date: 2013
- Type: Text , Conference paper
- Relation: 2013 International Conference on Digital Image Computing: Techniques and Applications (DICTA)
- Full Text:
- Reviewed:
- Description: This paper presents a new segmentation technique to use LIDAR point cloud data for automatic extraction of building roof planes. The raw LIDAR points are first classified into two major groups: ground and non-ground points. The ground points are used to generate a 'building mask' in which the black areas represent the ground where there are no laser returns below a certain height. The non-ground points are segmented to extract the planar roof segments. First, the building mask is divided into small grid cells. The cells containing the black pixels are clustered such that each cluster represents an individual building or tree. Second, the non-ground points within a cluster are segmented based on their coplanarity and neighbourhood relations. Third, the planar segments are refined using a rule-based procedure that assigns the common points among the planar segments to the appropriate segments. Finally, another rule-based procedure is applied to remove tree planes which are generally small in size and randomly oriented. Experimental results on three Australian sites have shown that the proposed method offers high building detection and roof plane extraction rates.
Building workforce innovation capacity in Australia: A dynamic economic framework for evaluating two strategies
- Cavagnoli, Donatella, Courvisanos, Jerry
- Authors: Cavagnoli, Donatella , Courvisanos, Jerry
- Date: 2013
- Type: Text , Conference paper
- Relation: Australian Conference of Economists p. 1-40
- Full Text: false
- Reviewed:
- Description: Innovation in Australia has become the top national priority in strengthening competitiveness of firms and generating strong economic development. This paper investigates the building of workforce innovation capacity through human resource management (HRM) practices to foster innovation in Australia. Two HRM strategies are identified as having operated in Australia over 40 years. One is a ‘soft’ HRM strategy based on greater worker autonomy; a strategy which dominated in the 1970s and 1980s. The other is a ‘hard’ HRM strategy based on routine worker performance measurement which has increasingly become more relevant since the 1990s and into the 21st Century as the basis for stronger competitive advantage. A dynamic discrete choice model is developed to provide a method for capturing and explaining variations in the relationship between the two strategies and innovation. This approach reframes the economics of innovation using a unique ‘containment of structure and contingency of agency’ spectrum to explain innovation-successful HRM practices which can account for both internal firm management policies and external-to-the-firm effects of government economic policies. For this reason, this study provides a historical understanding that links effective HRM strategy to building innovation capacity from both firm and government levels. Such experience can assist building a stronger Australian Innovation System so often demanded.
- Authors: Cavagnoli, Donatella , Courvisanos, Jerry
- Date: 2013
- Type: Text , Conference paper
- Relation: Australian Conference of Economists p. 1-40
- Full Text: false
- Reviewed:
- Description: Innovation in Australia has become the top national priority in strengthening competitiveness of firms and generating strong economic development. This paper investigates the building of workforce innovation capacity through human resource management (HRM) practices to foster innovation in Australia. Two HRM strategies are identified as having operated in Australia over 40 years. One is a ‘soft’ HRM strategy based on greater worker autonomy; a strategy which dominated in the 1970s and 1980s. The other is a ‘hard’ HRM strategy based on routine worker performance measurement which has increasingly become more relevant since the 1990s and into the 21st Century as the basis for stronger competitive advantage. A dynamic discrete choice model is developed to provide a method for capturing and explaining variations in the relationship between the two strategies and innovation. This approach reframes the economics of innovation using a unique ‘containment of structure and contingency of agency’ spectrum to explain innovation-successful HRM practices which can account for both internal firm management policies and external-to-the-firm effects of government economic policies. For this reason, this study provides a historical understanding that links effective HRM strategy to building innovation capacity from both firm and government levels. Such experience can assist building a stronger Australian Innovation System so often demanded.
CWDM: A case-based diabetes management web system
- Nguyen, Linh Hoang, Sun, Zhaohao, Stranieri, Andrew, Firmin, Sally
- Authors: Nguyen, Linh Hoang , Sun, Zhaohao , Stranieri, Andrew , Firmin, Sally
- Date: 2013
- Type: Text , Conference paper
- Relation: 24th Australasian Conference on Information Systems, 4-6th December, 2013 p. 1-10
- Full Text:
- Reviewed:
- Description: Treatment refers to the therapy to treat a disease or a health issue. Treatment in this situation is similar to medical treatment which mainly uses medicines in an attempt to relieve the pain or even stop the disease. However, medicines themselves could not entirely cure the disease (in this case, diabetes), the patients will need more intervention which will be introduced in the next section. In most of documents for diabetic treatment, insulin therapy may be the main factor, however it would seem that diabetic patient needs more than just insulin. Therefore, TCM – traditional Chinese medicine – is recommended in the diabetic treatment as a lot of its remedies not only adjust insulin but also maintain good health for the patients. This section presents some of the TCM remedies to treat diabetes. As mentioned, diabetic patients are treated by lifestyle intervention and insulin therapy according to their diabetic status. The prevalence of diabetes and its complications leads to the requirement of treatment and care plan. Guidelines for T2D treatment indicated the following primary areas: lifestyle improvement which involves at least two and half hours of physical operations every week, dietary plan which decreases the fat intake, and weight management which requires weight loss approximately 7% of the baseline weight; cardiovascular risk factor reduction by managing blood pressure, cholesterol level, control smoking status, hypertension; and blood glucose management such as mono-therapy methods using oral medications to reduce A1c levels (Ripsin, Kang, & Urban, 2009). Self-monitoring of blood glucose levels for T2D treatment is also suggested. The self-monitoring of blood glucose method is recommended because it could enhance the patients’ self-consciousness of managing their diabetic status and require greater behaviours, responsibilities and efforts. Besides, this method is cost-effective in long term for diabetic complications treatment (Szymborska-Kajaneka, Psureka, Heseb, & Strojek, 2009). Another related study recommended that for T2D patients who are using insulin, self-monitoring of blood glucose should be carried out daily at least three times; and for patients without insulin usage the frequency of blood glucose self-monitoring should be adjusted individually (Varanauskiene, 2008). Both studies indicate that there have been controversies whether self-monitoring of blood glucose is useful for T2D patients without insulin treatment. We recommend traditional Chinese medicine (TCM) as the major medicine for treating diabetes according to a report of natural Chinese medicines (Li, Zheng, Bukuru, & Kimpe, 2004) which indicates the results from many cases in various research and medical activities.
- Authors: Nguyen, Linh Hoang , Sun, Zhaohao , Stranieri, Andrew , Firmin, Sally
- Date: 2013
- Type: Text , Conference paper
- Relation: 24th Australasian Conference on Information Systems, 4-6th December, 2013 p. 1-10
- Full Text:
- Reviewed:
- Description: Treatment refers to the therapy to treat a disease or a health issue. Treatment in this situation is similar to medical treatment which mainly uses medicines in an attempt to relieve the pain or even stop the disease. However, medicines themselves could not entirely cure the disease (in this case, diabetes), the patients will need more intervention which will be introduced in the next section. In most of documents for diabetic treatment, insulin therapy may be the main factor, however it would seem that diabetic patient needs more than just insulin. Therefore, TCM – traditional Chinese medicine – is recommended in the diabetic treatment as a lot of its remedies not only adjust insulin but also maintain good health for the patients. This section presents some of the TCM remedies to treat diabetes. As mentioned, diabetic patients are treated by lifestyle intervention and insulin therapy according to their diabetic status. The prevalence of diabetes and its complications leads to the requirement of treatment and care plan. Guidelines for T2D treatment indicated the following primary areas: lifestyle improvement which involves at least two and half hours of physical operations every week, dietary plan which decreases the fat intake, and weight management which requires weight loss approximately 7% of the baseline weight; cardiovascular risk factor reduction by managing blood pressure, cholesterol level, control smoking status, hypertension; and blood glucose management such as mono-therapy methods using oral medications to reduce A1c levels (Ripsin, Kang, & Urban, 2009). Self-monitoring of blood glucose levels for T2D treatment is also suggested. The self-monitoring of blood glucose method is recommended because it could enhance the patients’ self-consciousness of managing their diabetic status and require greater behaviours, responsibilities and efforts. Besides, this method is cost-effective in long term for diabetic complications treatment (Szymborska-Kajaneka, Psureka, Heseb, & Strojek, 2009). Another related study recommended that for T2D patients who are using insulin, self-monitoring of blood glucose should be carried out daily at least three times; and for patients without insulin usage the frequency of blood glucose self-monitoring should be adjusted individually (Varanauskiene, 2008). Both studies indicate that there have been controversies whether self-monitoring of blood glucose is useful for T2D patients without insulin treatment. We recommend traditional Chinese medicine (TCM) as the major medicine for treating diabetes according to a report of natural Chinese medicines (Li, Zheng, Bukuru, & Kimpe, 2004) which indicates the results from many cases in various research and medical activities.
Estimation of induction motor parameters using hybrid algorithms for power system dynamic studies
- Susanto, Julius, Islam, Syed
- Authors: Susanto, Julius , Islam, Syed
- Date: 2013
- Type: Text , Conference proceedings , Conference paper
- Relation: 2013 Australasian Universities Power Engineering Conference, AUPEC 2013; Hobart, Australia; 29th September-3rd October 2013 p. 1-6
- Full Text:
- Reviewed:
- Description: This paper proposes a hybrid Newton-Raphson and genetic algorithm for the estimation of double cage induction motor parameters from commonly available manufacturer data. The hybrid algorithm was tested on a large data set of 6,380 IEC and NEMA motors and then compared with a baseline Newton-Raphson algorithm. The simulation results show that while the proposed hybrid algorithm is more computationally intensive, it does make significant improvements to convergence and error rates.
- Authors: Susanto, Julius , Islam, Syed
- Date: 2013
- Type: Text , Conference proceedings , Conference paper
- Relation: 2013 Australasian Universities Power Engineering Conference, AUPEC 2013; Hobart, Australia; 29th September-3rd October 2013 p. 1-6
- Full Text:
- Reviewed:
- Description: This paper proposes a hybrid Newton-Raphson and genetic algorithm for the estimation of double cage induction motor parameters from commonly available manufacturer data. The hybrid algorithm was tested on a large data set of 6,380 IEC and NEMA motors and then compared with a baseline Newton-Raphson algorithm. The simulation results show that while the proposed hybrid algorithm is more computationally intensive, it does make significant improvements to convergence and error rates.
Fitting Voronoi diagrams to planar tesselations
- Aloupis, Greg, Pérez-Rosés, Hebert, Pineda-Villavicencio, Guillermo, Taslakian, Perouz, Trinchet-Almaguer, Dannier
- Authors: Aloupis, Greg , Pérez-Rosés, Hebert , Pineda-Villavicencio, Guillermo , Taslakian, Perouz , Trinchet-Almaguer, Dannier
- Date: 2013
- Type: Text , Conference paper
- Relation: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) Vol. 8288 LNCS, p. 349-361
- Full Text:
- Reviewed:
- Description: Given a tesselation of the plane, defined by a planar straight-line graph G, we want to find a minimal set S of points in the plane, such that the Voronoi diagram associated with S 'fits' G. This is the Generalized Inverse Voronoi Problem (GIVP), defined in [12] and rediscovered recently in [3]. Here we give an algorithm that solves this problem with a number of points that is linear in the size of G, assuming that the smallest angle in G is constant. © 2013 Springer-Verlag.
- Authors: Aloupis, Greg , Pérez-Rosés, Hebert , Pineda-Villavicencio, Guillermo , Taslakian, Perouz , Trinchet-Almaguer, Dannier
- Date: 2013
- Type: Text , Conference paper
- Relation: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) Vol. 8288 LNCS, p. 349-361
- Full Text:
- Reviewed:
- Description: Given a tesselation of the plane, defined by a planar straight-line graph G, we want to find a minimal set S of points in the plane, such that the Voronoi diagram associated with S 'fits' G. This is the Generalized Inverse Voronoi Problem (GIVP), defined in [12] and rediscovered recently in [3]. Here we give an algorithm that solves this problem with a number of points that is linear in the size of G, assuming that the smallest angle in G is constant. © 2013 Springer-Verlag.
Forging a school-university learning partnership from a teacher education perspective
- Burke, Jenene, Goriss-Hunter, Anitra
- Authors: Burke, Jenene , Goriss-Hunter, Anitra
- Date: 2013
- Type: Text , Conference paper
- Relation: ATEA (Australian Teacher Education Association) 2013 Conference p. 1-7
- Full Text:
- Reviewed:
- Description: This paper describes an innovative cross-institutional learning partnership that was designed to foster the learning of both Pre-Service Teachers (PSTs) and students and teachers from a local regional Secondary College. Around 150 Grade Nine (13-14 year old) students took part in a purpose-designed activity day at the university that was organised and conducted by 34 second year PSTs as part of their teacher education program. This project was designed as an authentic teaching experience for PSTs that would enable them to translate theory from their teacher education course into teaching practice. At the same time the secondary students were offered a range of learning experiences informed by school-derived curriculum. These specifically focused activities contributed to the students’ school based learning programs whilst also encouraging them to think of university as a future option. In this paper reflections, utilizing a self-study methodology, are provided by the lecturers who developed and implemented the program. The lecturers describe and discuss what they observed about the learning of the PSTs. Many of the PSTs indicated strongly that they were able to engage in a scaffolded, authentic teaching experience as preparation for their initial school placements. Overall, the evidence suggests that the initiative offered a powerful learning experience that enabled PSTs to connect theory with teaching practice.
- Authors: Burke, Jenene , Goriss-Hunter, Anitra
- Date: 2013
- Type: Text , Conference paper
- Relation: ATEA (Australian Teacher Education Association) 2013 Conference p. 1-7
- Full Text:
- Reviewed:
- Description: This paper describes an innovative cross-institutional learning partnership that was designed to foster the learning of both Pre-Service Teachers (PSTs) and students and teachers from a local regional Secondary College. Around 150 Grade Nine (13-14 year old) students took part in a purpose-designed activity day at the university that was organised and conducted by 34 second year PSTs as part of their teacher education program. This project was designed as an authentic teaching experience for PSTs that would enable them to translate theory from their teacher education course into teaching practice. At the same time the secondary students were offered a range of learning experiences informed by school-derived curriculum. These specifically focused activities contributed to the students’ school based learning programs whilst also encouraging them to think of university as a future option. In this paper reflections, utilizing a self-study methodology, are provided by the lecturers who developed and implemented the program. The lecturers describe and discuss what they observed about the learning of the PSTs. Many of the PSTs indicated strongly that they were able to engage in a scaffolded, authentic teaching experience as preparation for their initial school placements. Overall, the evidence suggests that the initiative offered a powerful learning experience that enabled PSTs to connect theory with teaching practice.
Image processing-based on-line technique to detect power transformer winding faults
- Abu-Siada, Ahmed, Islam, Syed
- Authors: Abu-Siada, Ahmed , Islam, Syed
- Date: 2013
- Type: Text , Conference proceedings , Conference paper
- Relation: 39th Annual Conference of the IEEE Industrial Electronics Society, IECON 2013; Vienna, Austria; 10th-14th November 2013 p. 1-6
- Full Text:
- Reviewed:
- Description: Frequency Response Analysis (FRA) has been growing in popularity in recent times as a tool to detect mechanical deformation within power transformers. To conduct the test, the transformer has to be taken out of service which may cause interruption to the electricity grid. Moreover, because FRA relies on graphical analysis, it calls for an expert person to analyse the results as so far, there is no standard code for FRA interpretation worldwide. In this paper an online technique is introduced to detect the internal faults within a power transformer by constructing the voltage-current (V-I) locus diagram to provide a current state of the transformer health condition. The technique does not call for any special equipment as it uses the existing metering devices attached to any power transformer to monitor the input voltage, output voltage and the input current at the power frequency and hence online monitoring can be realised. Various types of faults have been simulated to assess its impact on the proposed locus. A Matlab code based on digital image processing is developed to calculate any deviation of the V-I locus with respect to the reference one and to identify the type of fault.
- Authors: Abu-Siada, Ahmed , Islam, Syed
- Date: 2013
- Type: Text , Conference proceedings , Conference paper
- Relation: 39th Annual Conference of the IEEE Industrial Electronics Society, IECON 2013; Vienna, Austria; 10th-14th November 2013 p. 1-6
- Full Text:
- Reviewed:
- Description: Frequency Response Analysis (FRA) has been growing in popularity in recent times as a tool to detect mechanical deformation within power transformers. To conduct the test, the transformer has to be taken out of service which may cause interruption to the electricity grid. Moreover, because FRA relies on graphical analysis, it calls for an expert person to analyse the results as so far, there is no standard code for FRA interpretation worldwide. In this paper an online technique is introduced to detect the internal faults within a power transformer by constructing the voltage-current (V-I) locus diagram to provide a current state of the transformer health condition. The technique does not call for any special equipment as it uses the existing metering devices attached to any power transformer to monitor the input voltage, output voltage and the input current at the power frequency and hence online monitoring can be realised. Various types of faults have been simulated to assess its impact on the proposed locus. A Matlab code based on digital image processing is developed to calculate any deviation of the V-I locus with respect to the reference one and to identify the type of fault.
Impact of axial displacement on power transformer FRA signature
- Hashemnia, Naser, Abu-Siada, Ahmed, Islam, Syed
- Authors: Hashemnia, Naser , Abu-Siada, Ahmed , Islam, Syed
- Date: 2013
- Type: Text , Conference proceedings , Conference paper
- Relation: 2013 IEEE Power and Energy Society General Meeting, PES 2013; Vancouver, Canada; 21st-25th July 2013 p. 1-4
- Full Text:
- Reviewed:
- Description: Frequency response analysis (FRA) is gaining global popularity in detecting power transformer winding movement due to the development of FRA test equipment. However, because FRA relies on graphical analysis, interpretation of its signatures is still a very specialized area that calls for skillful personnel to detect the sort and likely place of the fault as so far, there is no reliable standard code for FRA signature classification and quantification. This paper investigates the impact of transformer winding axial displacement on its FRA signature as a step toward the establishment of reliable codes for FRA interpretation. In this context a detailed model for a singlephase transformer is simulated using 3D finite element analysis to emulate a close to real transformer. The impact of axial displacement on the electrical distributed parameters model that are calculated based on the transformer physical dimension is examined to investigate how model’s parameters including inductance and capacitance matrices change when axial displacement takes place within a power transformer.
- Authors: Hashemnia, Naser , Abu-Siada, Ahmed , Islam, Syed
- Date: 2013
- Type: Text , Conference proceedings , Conference paper
- Relation: 2013 IEEE Power and Energy Society General Meeting, PES 2013; Vancouver, Canada; 21st-25th July 2013 p. 1-4
- Full Text:
- Reviewed:
- Description: Frequency response analysis (FRA) is gaining global popularity in detecting power transformer winding movement due to the development of FRA test equipment. However, because FRA relies on graphical analysis, interpretation of its signatures is still a very specialized area that calls for skillful personnel to detect the sort and likely place of the fault as so far, there is no reliable standard code for FRA signature classification and quantification. This paper investigates the impact of transformer winding axial displacement on its FRA signature as a step toward the establishment of reliable codes for FRA interpretation. In this context a detailed model for a singlephase transformer is simulated using 3D finite element analysis to emulate a close to real transformer. The impact of axial displacement on the electrical distributed parameters model that are calculated based on the transformer physical dimension is examined to investigate how model’s parameters including inductance and capacitance matrices change when axial displacement takes place within a power transformer.
Integration of LIDAR data and orthoimage for automatic 3D building roof plane extraction
- Awrangjeb, Mohammad, Fraser, Clive, Lu, Guojun
- Authors: Awrangjeb, Mohammad , Fraser, Clive , Lu, Guojun
- Date: 2013
- Type: Text , Conference paper
- Relation: 2013 IEEE International Conference on Multimedia and Expo (ICME)
- Full Text:
- Reviewed:
- Description: Automatic 3D extraction of building roofs from remotely sensed data is important for many applications including city modeling. This paper proposes a new method for automatic 3D roof extraction through an effective integration of LIDAR (Light Detection And Ranging) data and multispectral orthoimagery. Using the ground height from a DEM (Digital Elevation Model), the raw LIDAR points are separated into two groups. The first group contains the ground points that are exploited to constitute a `ground mask'. The second group contains the non-ground points which are segmented using an innovative image line guided segmentation technique to extract the roof planes. The image lines extracted from the grey-scale version of the orthoimage are classified into several classes such as `ground', `tree', `roof edge' and `roof ridge' using the ground mask and colour and texture information from the orthoimagery. During roof plane extraction the lines from the later two classes are used to fit roof planes to the neighbouring non-ground LIDAR points. Finally, a new rule-based procedure is applied to remove planes constructed on trees. Experimental results show that the proposed method successfully removes vegetation and offers high extraction rates.
- Authors: Awrangjeb, Mohammad , Fraser, Clive , Lu, Guojun
- Date: 2013
- Type: Text , Conference paper
- Relation: 2013 IEEE International Conference on Multimedia and Expo (ICME)
- Full Text:
- Reviewed:
- Description: Automatic 3D extraction of building roofs from remotely sensed data is important for many applications including city modeling. This paper proposes a new method for automatic 3D roof extraction through an effective integration of LIDAR (Light Detection And Ranging) data and multispectral orthoimagery. Using the ground height from a DEM (Digital Elevation Model), the raw LIDAR points are separated into two groups. The first group contains the ground points that are exploited to constitute a `ground mask'. The second group contains the non-ground points which are segmented using an innovative image line guided segmentation technique to extract the roof planes. The image lines extracted from the grey-scale version of the orthoimage are classified into several classes such as `ground', `tree', `roof edge' and `roof ridge' using the ground mask and colour and texture information from the orthoimagery. During roof plane extraction the lines from the later two classes are used to fit roof planes to the neighbouring non-ground LIDAR points. Finally, a new rule-based procedure is applied to remove planes constructed on trees. Experimental results show that the proposed method successfully removes vegetation and offers high extraction rates.