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Articles 151 - 180 of 259
Full-Text Articles in Entire DC Network
Efficient And Dynamic Key Management For Multiple Identities In Identity-Based Systems, Hua Guo, Chang Xu, Zhoujun Li, Yanqing Yao, Yi Mu
Efficient And Dynamic Key Management For Multiple Identities In Identity-Based Systems, Hua Guo, Chang Xu, Zhoujun Li, Yanqing Yao, Yi Mu
Faculty of Engineering and Information Sciences - Papers: Part A
The traditional identity-based cryptography requires a user, who holds multiple identities, to hold multiple private keys, where each private key is associated with an identity. Managing multiple private/public keys is a heavy burden to a user due to key management and storage. The recent advancement of identity-based cryptography allow a single private key to map multiple public keys (identities); therefore the private key management is simplified. Unfortunately, the existing schemes capturing this feature do not allow dynamic changes of identities and have a large data size proportional to the number of the associated identities. To overcome these problems, in this …
Combined Adaptive Lattice Reduction-Aided Detection And Antenna Shuffling For Dsttd-Ofdm Systems, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei
Combined Adaptive Lattice Reduction-Aided Detection And Antenna Shuffling For Dsttd-Ofdm Systems, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we consider lattice reduction (LR) aided linear detection in a DSTTD-OFDM (double space-time transmit diversity- orthogonal frequency division multiplexing) system with antenna shuffling. We first derive an antenna shuffling criterion for the LR-aided DSTTD-OFDM system. Next, we propose a combined reduced-feedback and adaptive LR algorithm by exploiting the correlation between OFDM subcarriers in the frequency domain. The LR-aided DSTTD OFDM system with this algorithm requires low computational effort for the LR operation and small feedback information. Simulation results show that a significant improvement could be achieved in the proposed system compared to previous (non-LR-aided) systems under spatially …
Spectral Triples For Hyperbolic Dynamical Systems, Michael F. Whittaker
Spectral Triples For Hyperbolic Dynamical Systems, Michael F. Whittaker
Faculty of Engineering and Information Sciences - Papers: Part A
Spectral triples are defined for C-algebras associated with hyperbolic dynam- ical systems known as Smale spaces. The spectral dimension of one of these spectral triples is shown to recover the topological entropy of the Smale space.
Adolescent Substance Abuse Treatment: Does Family Systems Therapy Improve Family Functioning And Decrease Drug Use?, Darin J. Wallis
Adolescent Substance Abuse Treatment: Does Family Systems Therapy Improve Family Functioning And Decrease Drug Use?, Darin J. Wallis
Electronic Theses and Dissertations
Family systems therapy is a way of working with individuals, couples, families, or a group of people that emphasizes relationships and a person's/family's greater "system" as important factors in establishing change and health (Haley, 1976; Minuchin, 1974). Treating adolescent substance abuse with family systems therapy has been demonstrated in the literature as being an effective method of intervention (Coatsworth, Santisteban, McBride, & Szapocznik, 2001; Kumfer & Alvarado, 2003; Leichtling, Gabriel, Lewis & Vander Ley, 2006; Liddle, 2002; Liddle et al., 2001; Rowe & Liddle, 2003), as the various ecological and epidemiological factors associated with adolescent substance abuse can be addressed …
A Medium Frequency Transformer With Multiple Secondary Windings For Medium Voltage Converter Based Wind Turbine Power Generating Systems, Md Rabiul Islam, Youguang Guo, Jianguo Zhu
A Medium Frequency Transformer With Multiple Secondary Windings For Medium Voltage Converter Based Wind Turbine Power Generating Systems, Md Rabiul Islam, Youguang Guo, Jianguo Zhu
Faculty of Engineering and Information Sciences - Papers: Part B
Recent advances in magnetic materials have led to the development of compact and light weight, medium and high frequency transformers, which would be a possible solution to reducing the size and weight of wind turbine power generating systems. This paper presents the overall design and analysis of a Metglas amorphous alloy 2605SA1 based medium frequency transformer to generate the isolated balanced multiple DC supplies for medium voltage converter systems. A comprehensive electromagnetic analysis is conducted on the proposed design based on experimental results. The test stand, data analysis, and test results are discussed.
Social Systems In Habitat-Specialist Reef Fishes: Key Concepts In Evolutionary Ecology, Marian Y.L Wong, Peter M. Buston
Social Systems In Habitat-Specialist Reef Fishes: Key Concepts In Evolutionary Ecology, Marian Y.L Wong, Peter M. Buston
Faculty of Science, Medicine and Health - Papers: part A
A major focus in evolutionary ecology lies in explaining the evolution and maintenance of social systems. Although most theoretical formulations of social system evolution were initially inspired by studies of birds, mammals, and insects, incorporating a wider taxonomic perspective is important for testing deeply entrenched theory. Here, we review the contribution of studies of habitat-specialist coral reef fishes to our understanding of the evolutionary ecology of animal social systems. These fishes are ecologically similar but display remarkable variation in mating systems, social organization, and sex allocation strategies. By reviewing recent research, we demonstrate their amenability for experimental testing of key …
A Comparison Of The Impact Of 'Seagrass-Friendly' Boat Mooring Systems On Posidonia Australis, Marie-Claire A. Demers, Andrew R. Davis, Nathan A. Knott
A Comparison Of The Impact Of 'Seagrass-Friendly' Boat Mooring Systems On Posidonia Australis, Marie-Claire A. Demers, Andrew R. Davis, Nathan A. Knott
Faculty of Science, Medicine and Health - Papers: part A
Permanent boat moorings have contributed to the decline of seagrasses worldwide, prompting the development of ‘seagrass-friendly’ moorings. We contrasted seagrass cover and density (predominantly Posidonia australis) in the vicinity of three mooring types and nearby reference areas lacking moorings in Jervis Bay, Australia. We examined two types of ‘seagrass-friendly’ mooring and a conventional ‘swing’ mooring. ‘Swing’ moorings produced significant seagrass scour, denuding patches of ∼9 m radius. Seagrass-friendly ‘cyclone’ moorings produced extensive denuded patches (average radius of ∼18 m). Seagrass-friendly ‘screw’ moorings, conversely, had similar seagrass cover to nearby reference areas. Our findings reinforce previous work highlighting the negative effects …
The Use Of Remote Sensing To Scale Up Measures Of Carbonate Production On Reef Systems: A Comparison Of Hydrochemical And Census-Based Estimation Methods, Sarah Hamylton, Jacob Silverman, Emily Shaw
The Use Of Remote Sensing To Scale Up Measures Of Carbonate Production On Reef Systems: A Comparison Of Hydrochemical And Census-Based Estimation Methods, Sarah Hamylton, Jacob Silverman, Emily Shaw
Faculty of Science, Medicine and Health - Papers: part A
The present study uses remote-sensing imagery to estimate carbonate production of the complete One Tree Island reef system, Great Barrier Reef, using hydrochemical (alkalinity reduction) and census-based (budgetary) methods. For five sites representing different benthic cover types across the reef system, carbonate production is determined using hydrochemical techniques that incubate substrates in a local aquarium and measure total alkalinity, total ammonia nitrogen, and total oxidized nitrogen. Local estimates are scaled up to the reef-system scale using a WorldView-2 satellite image, which is ground truthed against a field data set of 350 spatially referenced records of benthic assemblage. Annual total reef …
Mitigation Of Rooftop Solar Pv Impacts And Evening Peak Support By Managing Available Capacity Of Distributed Energy Storage Systems, Md Jan-E- Alam, Kashem Muttaqi, Darmawan Soetanto
Mitigation Of Rooftop Solar Pv Impacts And Evening Peak Support By Managing Available Capacity Of Distributed Energy Storage Systems, Md Jan-E- Alam, Kashem Muttaqi, Darmawan Soetanto
Faculty of Engineering and Information Sciences - Papers: Part A
A high penetration of rooftop solar photovoltaic (PV) resources into low-voltage (LV) distribution networks creates reverse power-flow and voltage-rise problems. This generally occurs when the generation from PV resources substantially exceeds the load demand during high insolation period. This paper has investigated the solar PV impacts and developed a mitigation strategy by an effective use of distributed energy storage systems integrated with solar PV units in LV networks. The storage is used to consume surplus solar PV power locally during PV peak, and the stored energy is utilized in the evening for the peak-load support. A charging/discharging control strategy is …
The Game Of Information Systems Higher Education, Mark Freeman, Alison E. Freeman
The Game Of Information Systems Higher Education, Mark Freeman, Alison E. Freeman
Faculty of Engineering and Information Sciences - Papers: Part A
With continual changes in higher education in the field of Information Systems (IS), educators are faced with the question: how can we actively engage each learner in a way that encourages self-direction while developing the ability to independently solve problems? The unique learning characteristics of adult learners must each be considered in the design of learning experiences in higher education environments. Gamification - the use of gaming elements in non-gaming contexts - is one source of opportunities for new and interesting learning experiences. Through discussion of 12 major gaming elements, this paper considers whether gamification can create innovative learning environments …
A Reflective Closed Loop Approach For Implementing A New Authentic Assessment-Based Teaching Facility For Electric Motor And Drive Systems, Craig Mclauchlan, Philip Ciufo, Sarath Perera
A Reflective Closed Loop Approach For Implementing A New Authentic Assessment-Based Teaching Facility For Electric Motor And Drive Systems, Craig Mclauchlan, Philip Ciufo, Sarath Perera
Faculty of Engineering and Information Sciences - Papers: Part A
BACKGROUND A new teaching facility with a focus on electric motor and drive systems has been implemented at the University of Wollongong. This facility aspires to use authentic assessment principles to assist in preparing students to properly utilise electric motor and drive systems in professional practice. In an attempt to realise this aim, the implementation of this facility was undertaken using a reflective closedloop approach, addressing the educational outcomes achieved by the students. Setting a holistic scope for the implementation beyond technical concerns to include educational outcomes was critical to the success achieved and has laid the foundation for further …
Application Of Multiple Objective Particle Swarm Optimisation In The Design Of Damaged Offshore Mooring Systems, Zhuo Wang, Timothy J. Mccarthy, M Neaz Sheikh
Application Of Multiple Objective Particle Swarm Optimisation In The Design Of Damaged Offshore Mooring Systems, Zhuo Wang, Timothy J. Mccarthy, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part A
The offshore hydrocarbon industry operates in more hostile environments as more of marginal fields become economically viable. This means that more floating production systems and economical mooring systems will be needed. With this increase in the use of marginal fields goes the need to re-use vessels and moorings. Floating production systems, such as FPSO's, need to survive extreme events and extreme damage conditions. When one mooring line is damaged, the remaining ones must be sufficient to avoid a complete failure and still protect critical components such as the riser. This paper looks into applying an evolutionary optimisation technique, namely multiple …
Path Clearance For Emergency Vehicles Through The Use Of Vehicle-To-Vehicle Communication, Craig Jordan, Mecit Cetin, R. Michael Robinson
Path Clearance For Emergency Vehicles Through The Use Of Vehicle-To-Vehicle Communication, Craig Jordan, Mecit Cetin, R. Michael Robinson
VMASC Publications
The study described in this paper evaluated and tested a new strategy to enable emergency response vehicles (EVs) to navigate through congestion at signalized intersections more efficiently. The proposed strategy involves the use of vehicle-to-vehicle communication to send messages to alert vehicles to the approach of the EV and to provide specific instructions on maneuvering to allow the EV to proceed through congested signalized intersections as quickly as possible. This movement is achieved by creation of a split in the vehicle queue in one lane at a critical location to allow the EV to proceed at its desired speed but …
Family-Related Risk Factors And Their Associations With Behavior Problems Of Children In Foster Care, Jena Leigh Ourso
Family-Related Risk Factors And Their Associations With Behavior Problems Of Children In Foster Care, Jena Leigh Ourso
LSU Master's Theses
Children in foster care are at risk for problems associated with breakdowns in their ecological system. Possible explanations for this may be that children’s daily interactions in early childhood are primarily with their parents. The relationship between child and parent (the dyad) is a crucial part of the way children grow and develop. Past research focuses on the child’s behavior problems as separate and isolated instead of focusing on the behavior problems as a symptom of the dysfunction in the dyad. This study explored the role of two specific risk factors for children in foster care and how these may …
Usability Testing Of Public Health Web-Based Information Systems, Sumayya Banna, Kholoud Alkayid, Helen M. Hasan, Joseph A. Meloche
Usability Testing Of Public Health Web-Based Information Systems, Sumayya Banna, Kholoud Alkayid, Helen M. Hasan, Joseph A. Meloche
Sumayya a Banna
While the Internet provides many opportunities for increased levels of care and access to information services in the area of public health, many web designers are not yet taking full advantage of its potential. This study looks at Intensive Care and Palliative Care, as important instances where health informatics could improve public web-based services, in meeting the particular information needs of family members of critically and chronically ill patients. This study is significant in adopting an approach to the usability testing of websites based on concepts from Activity Theory. This takes a realistic and practical approach, which identifies the purpose …
Membrane Phospholipid Composition, Alterations In Neurotransmitter Systems And Schizophrenia, Xu-Feng Huang, Chao Deng, Teresa Du Bois
Membrane Phospholipid Composition, Alterations In Neurotransmitter Systems And Schizophrenia, Xu-Feng Huang, Chao Deng, Teresa Du Bois
Xu-Feng Huang
No abstract provided.
Application Of Human Reasoning In Question Answering Systems, Farhad Oroumchian, E. Darudi, M. Rahgozar, B. Ofogi
Application Of Human Reasoning In Question Answering Systems, Farhad Oroumchian, E. Darudi, M. Rahgozar, B. Ofogi
Farhad Oroumchian
No abstract provided.
Usability Testing Of Public Health Web-Based Information Systems, Sumayya Banna, Kholoud Alkayid, Helen M. Hasan, Joseph A. Meloche
Usability Testing Of Public Health Web-Based Information Systems, Sumayya Banna, Kholoud Alkayid, Helen M. Hasan, Joseph A. Meloche
Helen Hasan
While the Internet provides many opportunities for increased levels of care and access to information services in the area of public health, many web designers are not yet taking full advantage of its potential. This study looks at Intensive Care and Palliative Care, as important instances where health informatics could improve public web-based services, in meeting the particular information needs of family members of critically and chronically ill patients. This study is significant in adopting an approach to the usability testing of websites based on concepts from Activity Theory. This takes a realistic and practical approach, which identifies the purpose …
Socio-Technical Systems: From Individual Transactions To Situated Community Activity, Helen M. Hasan
Socio-Technical Systems: From Individual Transactions To Situated Community Activity, Helen M. Hasan
Helen Hasan
Although basic concepts of Activity Theory were articulated almost a century ago, they have stood the test of time and are proving to be appropriate for research into modem situation involving the use of socio-technical systems. Over the past decades the field of Information Systems has advanced from a focus on routine transaction processing systems to more sophisticated applications that support situated community activity. This chapter will describe how Activity Theory is becoming increasing relevant to these types of systems and can be complemented by other approaches such as Complexity Theory and a particular Knowledge Lens. Research is presented that …
Implementing Systems In Complex Work Organisations, Wannapa Suratmethakul, Helen M. Hasan
Implementing Systems In Complex Work Organisations, Wannapa Suratmethakul, Helen M. Hasan
Helen Hasan
This paper describes research on a case of the introduction, into a large educational institution, of a complex timetabling system that was already well established in other similar organisations. The research has used a grounded theory approach to reveal details within complex phenomena in an organisation when a substantial new system was implemented. The study revealed three critical issues: Knowledge Transfer, System Capability, and Organisational Context that appeared to be related to the problems of implementing the new information system in the organisation. This research adds to the understanding of a common situation where management have an over simplified view …
Identifying Barriers To Internal Supply Chain Integration Using Systems Thinking, Franciscus Bakker, Tillmann Boehme, Dirk Pieter Van Donk
Identifying Barriers To Internal Supply Chain Integration Using Systems Thinking, Franciscus Bakker, Tillmann Boehme, Dirk Pieter Van Donk
Faculty of Commerce - Papers (Archive)
This exploratory site-centred research investigates barriers to internal supply chain integration in practice, using systems thinking. A multi-method procedure termed the Quick Scan Audit Methodology is applied to four engineering to order case companies from two different country settings to identify and categorize the actual barriers to internal supply chain integration. The study establishes that the case-significant barriers to internal supply chain integration chiefly relate to behavioral / cultural factors and the organizational arrangement / structures imposed on employees. A cross-case comparison reveals two major clusters of supply chain integration barriers termed “fire-fighting” and “functional-silo mentalities”. The fundamental structures of …
Double Space-Time Transmit Diversity For Very High Data Rate Mb-Ofdm Uwb Systems, Ngoc P. Le, Le C. Tran, Farzad Safaei
Double Space-Time Transmit Diversity For Very High Data Rate Mb-Ofdm Uwb Systems, Ngoc P. Le, Le C. Tran, Farzad Safaei
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we investigate a multiband-orthogonal frequency division multiplexing ultra-wideband (MB-OFDM UWB) system with very high data rates (VHDR) of several gigabits per second (Gbps). We propose a DSTTD-based VHDR MB-OFDM UWB system by incorporating a double space-time transmit diversity (DSTTD) scheme into the conventional MB-OFDM UWB system. At the receiver, an efficient soft-demapper that takes into consideration the noise enhancement due to a zero-forcing equalization is developed. Numerical simulations of the proposed system at a very high data rate of 2.Gbps over the IEEE 802.15.3a channel models are implemented. The simulation results show that this system could achieve …
Information Systems Development Projects As Complex Adaptive Systems, Karlheinz Kautz
Information Systems Development Projects As Complex Adaptive Systems, Karlheinz Kautz
Faculty of Engineering and Information Sciences - Papers: Part A
This research considers information systems development (ISD) projects as complex adaptive systems. We investigate the question whether complex adaptive systems (CAS) theory is relevant as a theoretical foundation for understanding ISD, and if so, which kind of understanding can be achieved by utilizing the theory? We introduce key concepts of CAS theory such as interaction, emergence, interconnected autonomous agents, selforganization, co-evolution, poise at the edge of chaos, time pacing, and poise at the edge of time to analyse and understand ISD in practice. We demonstrate the strength of such a CAS approach through an empirical case study presentation and analysis. …
A New Formulation For The Geometric Layout Optimisation Of Flat Slab Floor Systems, Muhammad N. Hadi, Pezhman Sharafi, Lip H. Teh
A New Formulation For The Geometric Layout Optimisation Of Flat Slab Floor Systems, Muhammad N. Hadi, Pezhman Sharafi, Lip H. Teh
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a heuristic approach for the optimum layout design of multi-span flat slab floors in order to optimise the total cost. For this purpose, a heuristic methodology is developed in order to achieve a new objective function for the structural optimisation problem. The proposed objective function has the capability to make use of action effects of the structure as the alternative design variables in place of the commonly used cross-sectional ones. Such a feature provides the method with the ability to be easily employed in large and realistic structural optimisation problems. Furthermore, the proposed formulation, in an iterative …
Multiuser Diversity With Capture In Ofdma Systems With Clustered Feedback, Hang Li, Qinghua Guo, Licai Fang, Defeng (David) Huang
Multiuser Diversity With Capture In Ofdma Systems With Clustered Feedback, Hang Li, Qinghua Guo, Licai Fang, Defeng (David) Huang
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we propose a cluster-based feedback protocol for multiuser orthogonal frequency-division multipleaccess (OFDMA) systems, where the capture effect is employed in each cluster to reduce the enormous system overhead induced by polling channel-state information. Then, we analyze the system throughput performance of the proposed feedback protocol. Compared with the full feedback scheme in the literature, numerical simulations show that the proposed protocol with clustered feedback in OFDMA systems achieves higher system throughput by employing the capture effect with limited feedback overhead, when the number of users is reasonably large. Moreover, compared with our previous protocol of Multiuser Diversity …
Strategic Discourse Across Organizational Meetings:Towards A Systems Perspective., Brendan K. O'Rourke, Martin Duffy
Strategic Discourse Across Organizational Meetings:Towards A Systems Perspective., Brendan K. O'Rourke, Martin Duffy
Conference Papers
Strategic Discourse across Organizational meetings: Towards a Systems Perspective Abstract This paper presents a tentative theoretical conception of how organizational meetings may be viewed as a system rather than as individual events. Perspectives from process metaphysics(Langley and Tsoukas, 2010), meso-discourse analysis (Alvesson and Karreman, 2000, 2011) and systems thinking (von Bertalanffy, 1969) are adopted, to explore and expand the theoretical resources available to conceptualise a ‘system of meetings’. The primary data draws from 130+ hours of recorded meeting proceedings, spanning 58 meeting events, from multiple sub-groups within a medium sized company.
Voltage Unbalance Management In Power Systems Based On Iec 61000-3-13:2008: Implications On The Use Of 'Kue Factor', Upuli Jayatunga, Sarath Perera, Philip Ciufo
Voltage Unbalance Management In Power Systems Based On Iec 61000-3-13:2008: Implications On The Use Of 'Kue Factor', Upuli Jayatunga, Sarath Perera, Philip Ciufo
Faculty of Engineering and Information Sciences - Papers: Part A
Voltage unbalance emission allocation principles prescribed in IEC61000-3-13:2008 Technical Report utilise a factor, kuE, which allows separation of the total voltage unbalance that arises at a point of evaluation due to both the load under consideration and the supply network. As per the definition given, this factor (kuE) accounts for the unbalance emission that arises due to the load whereas (1-kuE) accounts for unbalance that arises due to the network. The technical report prescribes a range of values from which a suitable value can be chosen based on the system characteristics, however, no systematic methodologies exist to-date to determine the …
The Seven-Level Flying Capacitor Based Anpc Converter For Grid Intergration Of Utility-Scale Pv Systems, Georgios Konstantinou, Sridhar R. Pulikanti, Mihai Ciobotaru, Vassilios G. Agelidis, Kashem Muttaqi
The Seven-Level Flying Capacitor Based Anpc Converter For Grid Intergration Of Utility-Scale Pv Systems, Georgios Konstantinou, Sridhar R. Pulikanti, Mihai Ciobotaru, Vassilios G. Agelidis, Kashem Muttaqi
Faculty of Engineering and Information Sciences - Papers: Part A
The installed capacity of grid connected PV plants has increased significantly over the past few years and is expected to continue its growth over the next decade due to the continuous demand for renewable energy and distributed generation systems. This paper presents a seven-level flying capacitor (FC) based active neutral point clamped (ANPC) converter for the connection of utility-scale PV system to the electricity grid. The multilevel voltage output of the topology provides high quality waveforms while maintaining the operational characteristics of NPC based converters for PV systems. The converter topology together with a method to regulate the FC voltages …
Dynamic Change Impact Analysis For Maintaining And Evolving Agent Systems, Hoa Khanh Dam, Aditya Ghose
Dynamic Change Impact Analysis For Maintaining And Evolving Agent Systems, Hoa Khanh Dam, Aditya Ghose
Faculty of Engineering and Information Sciences - Papers: Part A
In contrast to an increasing number of agent-based applica- tions in various domains, there has been very little work on maintenance and evolution of agent systems. This paper ad- dresses this gap with a focus on change impact analysis, i.e. estimating the potential eects of changes before they are made as an agent system evolves. We propose a technique for performing impact analysis in an agent system using dy- namic information about agent behaviour. Our approach builds a representation of an agent's behaviour by analyzing its execution traces which consist of goals and plans, and uses this representation to estimate …
Experimental Investigation Of Cable Catcher Systems For Office Building Blast Protection, Alexander Remennikov, L S. Brodie
Experimental Investigation Of Cable Catcher Systems For Office Building Blast Protection, Alexander Remennikov, L S. Brodie
Faculty of Engineering and Information Sciences - Papers: Part A
High performance cable catcher systems are an effective means of protecting office building windows and façades from effects of explosive blast. This paper presents experimental results for the response a simple cable catcher system subject to impact loads delivered using a drop-hammer testing facility. The objectives of this experimental programme were to investigate the loaddeformation behaviour of steel strand cables and to evaluate the dynamic performance of cable catcher systems in reference to their ability to absorb blast energy. Two steel cable arrangements (compacted and normal spiral strand) have been tensile tested in order to provide load-deformation curves as well …