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Articles 1 - 13 of 13
Full-Text Articles in Social and Behavioral Sciences
A Novel Method Of Embedding Additional Information Into Tensor Diffusion Filtering As An Application For Multi-Modal Reconstruction In Et, D Kazantsev, Sebastien Ourselin, Brian F. Hutton, W. R B. Lionheart, Simon Arridge
A Novel Method Of Embedding Additional Information Into Tensor Diffusion Filtering As An Application For Multi-Modal Reconstruction In Et, D Kazantsev, Sebastien Ourselin, Brian F. Hutton, W. R B. Lionheart, Simon Arridge
Faculty of Engineering and Information Sciences - Papers: Part A
The fast development of hybrid imaging modalities in tomography, such as SPECT (single photon emission computed tomography)/CT (computed tomography), PET (positron emission tomography)/MRI (magnetic resonance imaging) and PET/CT, have increased an interest for reconstruction algorithms which are able to utilize a functional and anatomical information at the same time. In this paper a new method proposed for iterative reconstruction with anatomical prior in emission tomography (ET). The introduced regularization term is a modified anisotropic tensor diffusion filter which has shape-adapted smoothing properties. The filter accommodates available anatomical information which results in enhanced position and image dependent spatial resolution of emission …
Multi-Objective Reactive Power Support From Wind Farms For Network Performance Enhancement, Lasantha Meegahapola, Brendan Fox, Tim Littler, Damian Flynn
Multi-Objective Reactive Power Support From Wind Farms For Network Performance Enhancement, Lasantha Meegahapola, Brendan Fox, Tim Littler, Damian Flynn
Faculty of Engineering and Information Sciences - Papers: Part A
This paper examines the ability of the doubly fed induction generator (DFIG) to deliver multiple reactive power objectives during variable wind conditions. The reactive power requirement is decomposed based on various control objectives (e.g. power factor control, voltage control, loss minimisation, and flicker mitigation) defined around different time frames (i.e. seconds, minutes, and hourly), and the control reference is generated by aggregating the individual reactive power requirement for each control strategy. A novel coordinated controller is implemented for the rotor-side converter and the grid-side converter considering their capability curves and illustrating that it can effectively utilise the aggregated DFIG reactive …
Measurement Of Multi-Slice Computed Tomography Dose Profile With The Dose Magnifying Glass And The Moskin Radiation Dosimeter, C P. L Lian, J H. D Wong, A Young, D Cutajar, M Petasecca, M L. F Lerch, Anatoly B. Rosenfeld
Measurement Of Multi-Slice Computed Tomography Dose Profile With The Dose Magnifying Glass And The Moskin Radiation Dosimeter, C P. L Lian, J H. D Wong, A Young, D Cutajar, M Petasecca, M L. F Lerch, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
This study describes the application of two in-house developed dosimeters, the Dose Magnifying Glass (DMG) and the MOSkin dosimeter at the Centre for Medical Radiation Physics, University of Wollongong, Australia, for the measurement of CT dose profiles for a clinical diagnostic 16-slice MSCT scanner. Two scanner modes were used; axial mode and helical mode, and the effect of varying beam collimation and pitch was studied. With an increase in beam collimation in axial mode and an increase of CT pitch in helical mode, cumulative point dose at scanner isocentre decreased while FWHM increased. There was generally good agreement to within …
Organ Point Dose Measurements In Clinical Multi Slice Computed Tomography (Msct) Examinations With The Moskin™ Radiation Dosimeter, C P. L Lian, A Young, D Cutajar, N Freeman, Anatoly B. Rosenfeld
Organ Point Dose Measurements In Clinical Multi Slice Computed Tomography (Msct) Examinations With The Moskin™ Radiation Dosimeter, C P. L Lian, A Young, D Cutajar, N Freeman, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
This study reports on the application of the MOSkin™ dosimeter in MSCT imaging for the real-time measurement of absorbed organ point doses in a tissue-equivalent female anthropomorphic phantom. MOSkin™ dosimeters were placed within the phantom to measure absorbed point organ doses for 2 commonly applied clinical scan protocols, namely the renal calculus scan and the pulmonary embolus scan. Measured organ doses in the imaged field of view were found to be in the dose range 4.7-9.5 mGy and 16.2-27.4 mGy for the renal calculus scan and pulmonary scan protocols respectively. For the derivation of effective dose, using the more recent …
Approximation Algorithm For Data Broadcasting In Duty Cycled Multi-Hop Wireless Networks, Dianbo Zhao, Kwan-Wu Chin
Approximation Algorithm For Data Broadcasting In Duty Cycled Multi-Hop Wireless Networks, Dianbo Zhao, Kwan-Wu Chin
Faculty of Engineering and Information Sciences - Papers: Part A
Broadcast is a fundamental operation in wireless networks. To this end, many past studies have studied the NP-hard, broadcast problem for always-on multi-hop networks. However, in wireless sensor networks, nodes are powered by batteries, meaning, they have finite energy. Consequently, nodes are required to have a low duty cycle, whereby they switch between active and sleep state periodically. This means that a transmission from a node may not reach all of its neighbors simultaneously. Consequently, any developed broadcast protocols must consider collisions and the wake-up times of neighboring nodes. Henceforth, this paper studies the minimum latency broadcast scheduling problem in …
A Multi Agent System Based Implementation For Semantic Web Services, J Shen, G Beydoun, G C. Low
A Multi Agent System Based Implementation For Semantic Web Services, J Shen, G Beydoun, G C. Low
Faculty of Engineering and Information Sciences - Papers: Part A
Many information systems developers face high cost in adopting service oriented architectures because of the high cost of locating appropriate services to customise and integrate into their system. This paper aims at reducing this cost by automating much of the composition and service selection effort. It illustrates the use of a Peer-Peer multi agent system (MAS) to facilitate service selection with multiple Quality of Service properties. The system will use semantic enrichment of services in order to facilitate their identification and composition. With semantic driven composition, services can be shared between teams of developers and across multiple organisations connected via …
On Improving Capacity And Delay In Multi Tx/Rx Wireless Mesh Networks With Weighted Links, Hung-Yi Loo, Sieteng Soh, Kwan-Wu Chin
On Improving Capacity And Delay In Multi Tx/Rx Wireless Mesh Networks With Weighted Links, Hung-Yi Loo, Sieteng Soh, Kwan-Wu Chin
Faculty of Engineering and Information Sciences - Papers: Part A
This paper considers the problem of deriving a link schedule for Time Division Multiple Access (TDMA)-based concurrent transmit/receive Wireless Mesh Networks (WMNs) that results in low end-to-end delays as well as high network capacity. We first propose a MAX-CUT heuristic approach, called Algo-2, that maximizes link activations in each slot of a super-frame. Algo-2 is shown to produce better network capacity as compared to existing heuristic approaches and significantly improves the super-frame length of an existing MAX-CUT approach that enforces 2-phase transmit-receive restriction - a node that transmits (receives) in slot i ≥ 1 is to become a receiver (transmitter) …
A Resources Provision Policy For Multi-Unit Maintenance Program, Winda Nur Cahyo, Khaled El-Akruti, Richard Dwight, Tieling Zhang
A Resources Provision Policy For Multi-Unit Maintenance Program, Winda Nur Cahyo, Khaled El-Akruti, Richard Dwight, Tieling Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
A System Dynamics model for resource provision policy in multi-unit maintenance program is developed. First, a scheme is developed to formulate and evaluate policies regarding the provision under uncertain condition or resource requirement in a period of planning to result in minimum maintenance cost. The model emphasizes on resourcing strategy involving human and procurement. It is composed of 3 sub-models presented in a causal loop modelling. The human resource sub-model focuses on policies related to provision and management. The procurement sub-model takes into account the procurement process and inventory system. Due to data availability, the verification has encloses only the …
Novel Receiver For Correlated Fading Multi-Antenna Physical Network Coding Twrns, Le Chung Tran, A. Mertins, Peter James Vial, Vinh Van Nguyen
Novel Receiver For Correlated Fading Multi-Antenna Physical Network Coding Twrns, Le Chung Tran, A. Mertins, Peter James Vial, Vinh Van Nguyen
Faculty of Engineering and Information Sciences - Papers: Part A
Physical Network Coding (PNC) has recently been proposed for multi-antenna Two-Way Relay Networks (TWRNs) with independent fading channels because the total network throughput could be significantly improved. However, PNC for multi-antenna TWRNs with correlated fading channels has not been considered yet. This paper thus considers an important class of multi-antenna TWRNs with the following properties: single-antenna source nodes and two-antenna relay; distance between source nodes and the relay is significantly larger than that between antennas of the relay; and channels between source nodes and the relay are correlated. For such a system, we first propose a novel correlation model that …
A Methodology For Cost Optimization Of The Layout Design Of Multi-Span Reinforced Concrete Beams, Pezhman Sharafi, Muhammad Hadi, Lip H. Teh
A Methodology For Cost Optimization Of The Layout Design Of Multi-Span Reinforced Concrete Beams, Pezhman Sharafi, Muhammad Hadi, Lip H. Teh
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a description of a new methodology for the optimum preliminary layout design of reinforced concrete multi-span beams considering the relevant cost elements. First, a new objective function is presented, as an alternative to traditional cost functions for reinforced concrete beams. The ability of being easily employed in layout optimization problems, gives the new cost function a distinct advantage over its alternatives. Examples are included to illustrate the performance of the new methodology.
Large Networks Of Vertical Multi-Layer Graphenes With Morphology-Tunable Magnetoresistance, Zengji Yue, Igor Levchenko, Shailesh Kumar, Donghan Seo, Xiaolin Wang, S X. Dou, Kostya Ken Ostrikov
Large Networks Of Vertical Multi-Layer Graphenes With Morphology-Tunable Magnetoresistance, Zengji Yue, Igor Levchenko, Shailesh Kumar, Donghan Seo, Xiaolin Wang, S X. Dou, Kostya Ken Ostrikov
Faculty of Engineering and Information Sciences - Papers: Part A
We report on the comparative study of magnetotransport properties of large-area vertical few-layer graphene networks with different morphologies, measured in a strong (up to 10 T) magnetic field over a wide temperature range. The petal-like and tree-like graphene networks grown by a plasma enhanced CVD process on a thin (500 nm) silicon oxide layer supported by a silicon wafer demonstrate a significant difference in the resistance-magnetic field dependencies at temperatures ranging from 2 to 200 K. This behaviour is explained in terms of the effect of electron scattering at ultra-long reactive edges and ultra-dense boundaries of the graphene nanowalls. Our …
Multi-Factor Coupling System Characteristic Of The Dynamic Roll Gap In The High-Speed Rolling Mill During The Unsteady Lubrication Process, Qiaoyi Wang, Zhengyi Jiang, Jingwei Zhao, Min Fang
Multi-Factor Coupling System Characteristic Of The Dynamic Roll Gap In The High-Speed Rolling Mill During The Unsteady Lubrication Process, Qiaoyi Wang, Zhengyi Jiang, Jingwei Zhao, Min Fang
Faculty of Engineering and Information Sciences - Papers: Part A
In the present work, a multi-factor coupling dynamic model of a rolling mill system for a dynamic roll gap during an unsteady lubrication process was developed on the basis of the rolling theory, lubrication and the friction theory, and the mechanical vibration theory. The multi-factor coupling model of interfacial film binding was coupled with the rolling force model, dynamic roll gap interface friction model and work roll movement model. The corresponding distributions of friction and pressure at varying surface roughness and times were systematically analyzed during the unsteady mixed lubrication process. The effects of the main processing parameters on the …
A General Compression Approach To Multi-Channel Three-Dimensional Audio, Bin Cheng, Christian Ritz, Ian Burnett, Xiguang Zheng
A General Compression Approach To Multi-Channel Three-Dimensional Audio, Bin Cheng, Christian Ritz, Ian Burnett, Xiguang Zheng
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a technique for low bit rate compression of three-dimensional (3D) audio produced by multiple loudspeaker channels. The approach is based on the time-frequency analysis of the localization of spatial sound sources within the 3D space as rendered by a multi-channel audio signal (in this case 16 channels). This analysis results in the derivation of a stereo downmix signal representing the original 16 channels. Alternatively, a mono-downmix signal with side information representing the location of sound sources within the 3D spatial scene can also be derived. The resulting downmix signals are then compressed with a traditional audio coder, …