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Articles 2791 - 2820 of 2936
Full-Text Articles in Social and Behavioral Sciences
Countably Generated Hilbert Modules, The Kasparov Stabilisation Theorem, And Frames In Hilbert Modules, Iain Raeburn, Shaun J. Thompson
Countably Generated Hilbert Modules, The Kasparov Stabilisation Theorem, And Frames In Hilbert Modules, Iain Raeburn, Shaun J. Thompson
Faculty of Engineering and Information Sciences - Papers: Part A
We consider a class of countably generated Hilbert modules in which the generators are multipliers of the module, and prove a version of the Kasparov Stabilisation Theorem for these modules. We then extend recent work of Frank and Larson on frames in Hilbert modules.
Compiler Optimization And Ordering Effects On Vliw Code Compression, Montserrat Ros, Peter Sutton
Compiler Optimization And Ordering Effects On Vliw Code Compression, Montserrat Ros, Peter Sutton
Faculty of Engineering and Information Sciences - Papers: Part A
Code size has always been an important issue for all embedded applications as well as larger systems. Code compression techniques have been devised as a way of battling bloated code; however, the impact of VLIW compiler methods and outputs on these compression schemes has not been thoroughly investigated. This paper describes the application of single- and multipleinstruction dictionary methods for code compression to decrease overall code size for the TI TMS320C6xxx DSP family. The compression scheme is applied to benchmarks taken from the Mediabench benchmark suite built with differing compiler optimization parameters. In the single instruction encoding scheme, it was …
Image Retrieval With Svm Active Learning Embedding Euclidean Search, Lei Wang, Kap Luk Chan, Yap Peng Tan
Image Retrieval With Svm Active Learning Embedding Euclidean Search, Lei Wang, Kap Luk Chan, Yap Peng Tan
Faculty of Engineering and Information Sciences - Papers: Part A
Image retrieval with relevance feedback suffers from the small sample problem. Recently, SVM active learning has been proposed to tackle this problem, showing promising results. However, a small but sufficient number of initially labelled samples are still required to ensure the subsequent active learning efficient and good retrieval performance. In the existing method, the user is asked to label more images before active learning starts. In this paper, a method of embedding Euclidean search into SVM active learning is proposed. With the help of Euclidean search, not only the adverse effect on retrieval performance due to lack of initially labelled …
The Surface Area Preserving Mean Curvature Flow, James Mccoy
The Surface Area Preserving Mean Curvature Flow, James Mccoy
Faculty of Engineering and Information Sciences - Papers: Part A
We adopt similar notation to Huisken in [Hu1] and [Hu2]. Let M be an n-dimensional Riemannian manifold.
Effect Of Deformation Schedule On The Microstructure And Mechanical Properties Of A Thermomechanically Processed C-Mn-Si Transformation-Induced Plasticity Steel, I B. Timokhina, P D. Hodgson, E V. Pereloma
Effect Of Deformation Schedule On The Microstructure And Mechanical Properties Of A Thermomechanically Processed C-Mn-Si Transformation-Induced Plasticity Steel, I B. Timokhina, P D. Hodgson, E V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
Thermomechanical processing simulations were performed using a hot-torsion machine, in order to develop a comprehensive understanding of the effect of severe deformation in the recrystallized and nonrecrystallized austenite regions on the microstructural evolution and mechanical properties of the 0.2 wt pct C-1.55 wt pct Mn-1.5 wt pct Si transformation-induced plasticity (TRIP) steel. The deformation schedule affected all constituents (polygonal ferrite, bainite in different morphologies, retained austenite, and martensite) of the multiphased TRIP steel microstructure. The complex relationships between the volume fraction of the retained austenite, the morphology and distribution of all phases present in the microstructure, and the mechanical properties …
Intersection Type Systems And Logics Related To The Meyer-Routley System B+, Martin W. Bunder
Intersection Type Systems And Logics Related To The Meyer-Routley System B+, Martin W. Bunder
Faculty of Engineering and Information Sciences - Papers: Part A
Some, but not all, closed terms of the lambda calculus have types; these types are exactly the theorems of intuitionistic implicational logic. An extension of these simple (→) types to intersection (or →∧) types allows all closed lambda terms to have types. The corresponding →∧ logic, related to the Meyer–Routley minimal logic B+ (without ∨), is weaker than the →∧ fragment of intuitionistic logic. In this paper we provide an introduction to the above work and also determine the →∧ logics that correspond to certain interesting subsystems of the full →∧ type theory.
Issues For Connection Of Distributed Generation In Rural/Remote Power Systems, Kashem M. Muttaqi, Gerard Ledwich, Michael Negnevitsky
Issues For Connection Of Distributed Generation In Rural/Remote Power Systems, Kashem M. Muttaqi, Gerard Ledwich, Michael Negnevitsky
Faculty of Engineering and Information Sciences - Papers: Part A
Connection of distributed generation (DG) into a distribution grid system affects the normal operation, control and protection of the distribution system. This paper addresses some of the technical issues arisen due to the addition of generation to a rural/remote distribution network. In this paper, a voltage controlled rotary DG is modelled to operate in the line of voltage sensitivity for maximum voltage improvement. A scenario-based study on DG operation and control has been conducted and recommendations for effective operation of DG presented. An investigation on barriers to inclusion of utility owned and customer owned DG has been carried out and …
Smoothness And Locality For Nonunital Spectral Triples, Adam C. Rennie
Smoothness And Locality For Nonunital Spectral Triples, Adam C. Rennie
Faculty of Engineering and Information Sciences - Papers: Part A
To deal with technical issues in noncommuntative geometry for nonunital algebras, we introduce a useful class of algebras and their modules. Thes algebras and modules allo us to extend all of the smoothness results for spectral triples to the nonunital case. In addition, we show that smooth spectral tiples are closed under the C- functional calculus of self-adjoint elements. In the final section we show that our algebras allow the formulation of Poincare Duality and that the algebras of smooth spectral triples are H-unital.
Theoretical And Experimental Investigation Of Descending Salt Plumes From A Circular Source, Apichart Chaengbamrung, Paul Cooper, Peter W. Wypych, Ajit R. Godbole
Theoretical And Experimental Investigation Of Descending Salt Plumes From A Circular Source, Apichart Chaengbamrung, Paul Cooper, Peter W. Wypych, Ajit R. Godbole
Faculty of Engineering and Information Sciences - Papers: Part A
This paper describes work in the first part of an ongoing research programme on the generation and dispersion of fume from hot metal processes, a challenging industrial ventilation problem. This phase of the study involves research into a salt solution plume generated from an area source and descending into quiescent water. This is a 'cold flow' analogue of a thermal plume ascending in quiescent air. Experiments are described whereby the velocity and concentration profiles in the plume are determined using video footage and particle-tracking software, and a conductivity probe with digital traversing mechanism, respectively. Results from a transient numerical simulation …
Comparing Particle Swarms For Tracking Extrema In Dynamic Environments, Xiaodong Li, Hoa K. Dam
Comparing Particle Swarms For Tracking Extrema In Dynamic Environments, Xiaodong Li, Hoa K. Dam
Faculty of Engineering and Information Sciences - Papers: Part A
This work presents a comparative study of particle swarm models on their abilities to track extrema in dynamic environments. A standard PSO, two randomized PSOs, and a fine-grained PSO are evaluated in non-trivial multimodal dynamic environments involving small constant step changes, different large step changes, and chaotic step changes of the extrema. DF1 proposed by Morrison and De Jong is used to generate these three types of dynamics (1999). Our results indicate that PSO and its variants are able to perform reasonably well in a 2-dimensional variable space, whereas perform well to a less extent in a 10-dimensional variable space. …
Actions Of Z^K Associated To Higher Rank Graphs, Alexander Kumjian, David Pask
Actions Of Z^K Associated To Higher Rank Graphs, Alexander Kumjian, David Pask
Faculty of Engineering and Information Sciences - Papers: Part A
An action of Zk is associated to a higher rank graph Λ satisfying a mild assumption. This generalizes the construction of a topological Markov shift arising from a non-negative integer matrix. We show that the stable Ruelle algebra of Λ is strongly Morita equivalent to C∗(Λ). Hence, if Λ satisfies the aperiodicity condition, the stable Ruelle algebra is simple, stable and purely infinite.
Glass Formation In A (Ti,Zr,Hf)-(Cu,Ni,Ag)-Al High-Order Alloy System By Mechanical Alloying, L C. Zhang, Z Q. Shen, Jian Xu
Glass Formation In A (Ti,Zr,Hf)-(Cu,Ni,Ag)-Al High-Order Alloy System By Mechanical Alloying, L C. Zhang, Z Q. Shen, Jian Xu
Faculty of Engineering and Information Sciences - Papers: Part A
In this work, glass formation under high-energy ball milling was investigated for a (Ti0.33Zr0.33Hf0.33)50(Ni0.33Cu0.33Ag0.33)40Al10 high-order alloy system with equiatomic substitution for early and late transition-metal contents. For comparison, an amorphous alloy ribbon with the same composition was prepared using the melt-spinning method as well. Structural features of the samples were characterized using x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. Mechanical alloying resulted in a glassy alloy similar to that obtained by melt spinning. However, the glass formation was incomplete, and a …
Representations Of Cuntz-Pimsner Algebras, Neal J. Fowler, Paul S. Muhly, Iain Raeburn
Representations Of Cuntz-Pimsner Algebras, Neal J. Fowler, Paul S. Muhly, Iain Raeburn
Faculty of Engineering and Information Sciences - Papers: Part A
Let X be a Hilbert bimodule over a C * -algebra A. We analyse the structure of the associated Cuntz-Pimsner algebra X and related algebras using representation-theoretic methods. In particular, we study the ideals (I) in X induced by appropriately invariant ideals I in A, and identify the quotients X/(I) as relative Cuntz-Pimsner algebras of Muhly and Solel. We also prove a gauge-invariant uniqueness theorem for X, and investigate the relationship between X and an alternative model proposed by Doplicher, Pinzari and Zuccante.
Delta-Ferrite Recovery Structures In Low-Carbon Steels, Rian Dippenaar, Dominic Phelan
Delta-Ferrite Recovery Structures In Low-Carbon Steels, Rian Dippenaar, Dominic Phelan
Faculty of Engineering and Information Sciences - Papers: Part A
The development of delta-ferrite recovery substructures in low-carbon steels has been observed in-situ utilizing laser scanning confocal microscopy (LSCM). Well-developed sub-boundaries with interfacial energies much smaller than that of delta-ferrite grain boundaries formed following transformation from austenite to delta-ferrite on heating. It is proposed that transformation stresses associated with the austenite to delta-ferrite phase transformation generate dislocations that subsequently recover into sub-boundaries by a process of polygonization. Experimental evidence in support of this proposal was found in a ferritic stainless steel. Thermal cycling through the high-temperature delta-ferrite/austenite/delta-ferrite phase transformation leads to the development of a well-defined recovery substructure, which, in …
Detection Of Carbon Monoxide Within The Magellanic Bridge, E Muller, L Staveley-Smith, William Zealey
Detection Of Carbon Monoxide Within The Magellanic Bridge, E Muller, L Staveley-Smith, William Zealey
Faculty of Engineering and Information Sciences - Papers: Part A
The Mopra 22-m and SEST 15-m telescopes have been used to detect and partially map a region of 12CO(1-0) line emission within the Magellanic Bridge, a region lying between the Large and Small Magellanic Clouds (LMC and SMC, respectively). The emission appears to be embedded in a cloud of neutral hydrogen, and is in the vicinity of an IRAS source. The CO emission region is found to have a 60 μm/100 μm flux density ratio typical for 12CO(1-0) detections within the SMC, although it has a significantly lower 12CO brightness and velocity width. These suggest that the …
High-Resolution Hi Observations Of The Western Magellanic Bridge, E Muller, L Staveley-Smith, William Zealey, S Stanimirovic
High-Resolution Hi Observations Of The Western Magellanic Bridge, E Muller, L Staveley-Smith, William Zealey, S Stanimirovic
Faculty of Engineering and Information Sciences - Papers: Part A
The 21-cm line emission from a 7 × 6 deg2 region east of and adjoining the Small Magellanic Cloud (SMC) has been observed with the Australia Telescope Compact Array and the Parkes telescopes. This region represents the westernmost part of the Magellanic Bridge, a gas-rich tail extending ∼14° to the Large Magellanic Cloud. A rich and complex neutral hydrogen (H i) structure containing shells, bubbles and filaments is revealed. On the larger scale, the H i of the Bridge is organized into two velocity components. This bimodality, which appears to originate in the SMC, converges to a single velocity …
Bounds For The Best Constant In An Improved Hardy-Sobolev Inequality, Nirmalendu Chaudhuri
Bounds For The Best Constant In An Improved Hardy-Sobolev Inequality, Nirmalendu Chaudhuri
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Bootstrapping Svm Active Learning By Incorporating Unlabelled Images For Image Retrieval, Lei Wang, Kap Luk Chan, Zhihua Zhang
Bootstrapping Svm Active Learning By Incorporating Unlabelled Images For Image Retrieval, Lei Wang, Kap Luk Chan, Zhihua Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
The performance of image retrieval with SVM active learning is known to be poor when started with few labelled images only. In this paper, the problem is solved by incorporating the unlabelled images into the bootstrapping of the learning process. In this work, the initial SVM classifier is trained with the few labelled images and the unlabelled images randomly selected from the image database. Both theoretical analysis and experimental results show that by incorporating unlabelled images in the bootstrapping, the efficiency of SVM active learning can be improved, and thus improves the overall retrieval performance.
Australian Online Supermarket Usability, Mark Freeman, Peter N. Hyland, Jeffrey Soar
Australian Online Supermarket Usability, Mark Freeman, Peter N. Hyland, Jeffrey Soar
Faculty of Engineering and Information Sciences - Papers: Part A
The issue of usability plays a vital role in the success of an online store. However, to date there has been limited published research into this issue and there has been no research conducted into multiple item purchasing. There is much competition in the grocery shopping industry between the two major physical supermarket chains in Australia, Woolworths and Coles, both in traditional stores and online. Online, the major competitor is ShopFast, which does not have a traditional supermarket storefront to complement its online operations. The purpose of this study was to conduct a comparative analysis into the usability of ordering …
Local Compactness In Free Topological Groups, Peter Nickolas, Mikhail Tkachenko
Local Compactness In Free Topological Groups, Peter Nickolas, Mikhail Tkachenko
Faculty of Engineering and Information Sciences - Papers: Part A
We show that the subspace An(X) of the free Abelian topological group A(X) on a Tychonoff space X is locally compact for each n ω if and only if A2(X) is locally compact if an only if F2(X) is locally compact if and only if X is the topological sum of a compact space and a discrete space. It is also proved that the subspace Fn(X) of the free topological group F(X) is locally compact for each n …
Chain Entanglements And Fracture Energy In Interfaces Between Immiscible Polymers, Leonardo Silvestri, Hugh Ralph Brown, Stefano Carra, Sergio Carra
Chain Entanglements And Fracture Energy In Interfaces Between Immiscible Polymers, Leonardo Silvestri, Hugh Ralph Brown, Stefano Carra, Sergio Carra
Faculty of Engineering and Information Sciences - Papers: Part A
It is a very well-known experimental fact that the toughness of interfaces obtained by joining pairs of immiscible glassy polymers is strongly correlated to the interfacial width. Several models have been proposed in the literature to estimate the fracture energy of these interfaces, but the agreement displayed with the experimental data cannot be considered satisfactory. In this paper a new model is proposed for polymers with molecular weight higher than the critical value for the onset of entanglements. The model is based on a precise and realistic calculation of the areal density of entangled strands across the interface, that is …
Www Sites Vs. Applications Software: The Dais Model, Lejla Vrazalic, Peter N. Hyland
Www Sites Vs. Applications Software: The Dais Model, Lejla Vrazalic, Peter N. Hyland
Faculty of Engineering and Information Sciences - Papers: Part A
Since the advent and widespread use of the Internet, it has become apparent that there are significant differences between applications software and WWW sites which warrant a re-examination of HCI design and evaluation methods. Previous research has identified and documented the factors which differentiate between applications software and WWW sites, however a well defined model of these differences and their origins was not available. This paper defines such a model of Distinguishing Attributes for Informational Sites (DAIS). © 2003 ACM.
Design And Implementation Of A Content Filtering Firewall, Rongbo Du, Rei Safavi-Naini, Willy Susilo
Design And Implementation Of A Content Filtering Firewall, Rongbo Du, Rei Safavi-Naini, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
A firewall is a system for enforcing access control policy between two networks and is one of the most important measures to protect against network attacks. Firewalls traditionally protect the internal network from outside threats. But there has been increasing need for preventing the misuses of the network by the internal users which most previous firewalls overlook. In this paper, we propose a method of adding content filtering functionality to the firewall and describe its implementation. We also show a new attack that combines JAVA Applet and XML to get around the content filtering firewall, hence showing the need for …
The Two-Prime Analogue Of The Hecke C*-Algebra Of Bost And Connes, Nadia Larsen, Ian Putnam, Iain Raeburn
The Two-Prime Analogue Of The Hecke C*-Algebra Of Bost And Connes, Nadia Larsen, Ian Putnam, Iain Raeburn
Faculty of Engineering and Information Sciences - Papers: Part A
Let p and q be distinct odd primes. We analyse a semigroup crossed product C * (G p,q) α 2 similar to the semigroup crossed product which models the Hecke C * -algebra of Bost and Connes. We describe a composition series of ideals in C * (G p,q) α 2 , and show that the structure of one of the subquotients reflects interesting number-theoretic information about the multiplicative orders of q in the rings Z/pl Z.
Regularity Of Induced Representations And A Theorem Of Quigg And Speilberg, Astrid An Huef, Iain Raeburn
Regularity Of Induced Representations And A Theorem Of Quigg And Speilberg, Astrid An Huef, Iain Raeburn
Faculty of Engineering and Information Sciences - Papers: Part A
Mackey's imprimitivity theorem characterizes the unitary representations of a locally compact group G which have been induced from representations of a closed subgroup K; Rieffel's influential reformulation says that the group C*-algebra C*(K) is Morita equivalent to the crossed product C0(G/K)×G [14]. There have since been many important generalizations of this theorem, especially by Rieffel [15, 16] and by Green [3, 4]. These are all special cases of the symmetric imprimitivity theorem of [11], which gives a Morita …
Mr Damper And Its Application For Semi-Active Control Of Vehicle Suspension System, G Z. Yao, F F. Yap, G Chen, Weihua Li, S H. Yeo
Mr Damper And Its Application For Semi-Active Control Of Vehicle Suspension System, G Z. Yao, F F. Yap, G Chen, Weihua Li, S H. Yeo
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, a semi-active control of vehicle suspension system with magnetorheological (MR) damper is presented. At first a MR damper working in flow mode is designed. Performance testing is done for this damper with INSTRON machine. Then a mathematical model, Bouc–Wen model, is adopted to characterize the performance of the MR damper. With optimization method in MATLAB® and experimental results of MR damper, the coefficients of the model are determined. Finally, a scaled quarter car model is set up including the model of the MR damper and a semi-active control strategy is adopted to control the vibration of …
Product Systems Over Right-Angled Artin Semigroups, Neal J. Fowler, Aidan Sims
Product Systems Over Right-Angled Artin Semigroups, Neal J. Fowler, Aidan Sims
Faculty of Engineering and Information Sciences - Papers: Part A
We build upon MacLane's definition of a tensor category to introduce the concept of a product system that takes values in a tensor groupoid G. We show that the existing notions of product systems fit into our categorical framework, as do the k-graphs of Kumjian and Pask. We then specialize to product systems over right-angled Artin semigroups; these are semigroups that interpolate between free semigroups and free abelian semigroups. For such a semigroup we characterize all product systems which take values in a given tensor groupoid G. In particular, we obtain necessary and sufficient conditions under which a collection of …
Mtd Method For Better Prediction Of Sea Surface Temperature, Velappa Ganapathy, K Meena, Kashem M. Muttaqi
Mtd Method For Better Prediction Of Sea Surface Temperature, Velappa Ganapathy, K Meena, Kashem M. Muttaqi
Faculty of Engineering and Information Sciences - Papers: Part A
A class of incremental learning procedures known as the Modified Temporal Difference (MTD) method is introduced in this paper for fixed-step prediction problems which uses the functional features of Multilayer Perceptron. The method is applied for weekly prediction of the Sea Surface Temperature (SST) from oceanographic data. Temporal Difference (TD) methods suggest how each output of a temporal sequence must be changed, whereas a back-propagation algorithm decides which part(s) of a network to change in order to influence its output and reduce the overall error. In other words, TD methods and back-propagation address temporal credit and structural credit assignment issues, …
A 2-Secure Code With Efficient Tracing Algorithm, Joseph Tonien, Rei Safavi-Naini, Yejing Wang
A 2-Secure Code With Efficient Tracing Algorithm, Joseph Tonien, Rei Safavi-Naini, Yejing Wang
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Mechanically Alloyed Amorphous Ti50(Cu0.45ni0.55)44-X Alxsi4b2 Alloys With Supercooled Liquid Region, L C. Zhang, Jian Xu, E Ma
Mechanically Alloyed Amorphous Ti50(Cu0.45ni0.55)44-X Alxsi4b2 Alloys With Supercooled Liquid Region, L C. Zhang, Jian Xu, E Ma
Faculty of Engineering and Information Sciences - Papers: Part A
A high-energy ball milling procedure has been developed to produce amorphous alloys in Ti50(Cu0.45Ni0.55)44−xAlxSi4B2 (x= 0, 4, 8, 12) powder mixtures. The milling products were characterized using x-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. The Ti-based amorphous alloy powders prepared through this solid-state process exhibit a well-defined glass transition and a supercooled liquid region (ΔTx =64 K) close to the largest achieved so far for Ti-based undercooled melts. The substitution of Al for Cu and Ni has beneficial effects on …