Optimal Design Of Semi Active Control For Adjacent Buildings Connected By Mr Damper Based On Integrated Fuzzy Logic And Multi-Objective Genetic Algorithm,
2014
University of Wollongong
Optimal Design Of Semi Active Control For Adjacent Buildings Connected By Mr Damper Based On Integrated Fuzzy Logic And Multi-Objective Genetic Algorithm, Mehmet Uz, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part A
An optimal design strategy based on genetic algorithms (GA) is proposed for nonlinear hysteretic control devices that prevent pounding damage and achieve the best results in seismic response mitigation of two adjacent structures. An integrated fuzzy controller is used in order to provide the interactive relationships between damper forces and input voltages for MR dampers based on the modified Bouc-Wen model. Furthermore, Linear Quadratic Regulator (LQR) and H2/LQG (Linear Quadratic Gaussian) controllers based on clipped voltage law (CVL) are also used to compare the results obtained by fuzzy controller. This study employs the main objectives of the optimal design that …
Simplicity Of Algebras Associated To Étale Groupoids,
2014
Kansas State University
Simplicity Of Algebras Associated To Étale Groupoids, Jonathan Brown, Lisa Orloff Clark, Cynthia Farthing, Aidan Sims
Faculty of Engineering and Information Sciences - Papers: Part A
We prove that the full C*-algebra of a second-countable, Hausdorff, etale, amenable groupoid is simple if and only if the groupoid is both topologically principal and minimal. We also show that if G has totally disconnected unit space, then the complex *-algebra of its inverse semigroup of compact open bisections, as introduced by Steinberg, is simple if and only if G is both effective and minimal.
Investigating The Optimal Passive And Active Vibration Controls Of Adjacent Buildings Based On Performance Indices Using Genetic Algorithms,
2014
University of Wollongong
Investigating The Optimal Passive And Active Vibration Controls Of Adjacent Buildings Based On Performance Indices Using Genetic Algorithms, Muhammad N. S Hadi, Mehmet Uz
Faculty of Engineering and Information Sciences - Papers: Part A
This study proposes the optimal passive and active damper parameters for achieving the best results in seismic response mitigation of coupled buildings connected to each other by dampers. The optimisation to minimise the H2 and H- norms in the performance indices is carried out by genetic algorithms (GAs). The final passive and active damper parameters are checked for adjacent buildings connected to each other under El Centro NS 1940 and Kobe NS 1995 excitations. Using real coded GA in H- norm, the optimal controller gain is obtained by different combinations of the measurement as the feedback for designing the control …
Attribute-Based Data Transfer With Filtering Scheme In Cloud Computing,
2014
University of Wollongong
Attribute-Based Data Transfer With Filtering Scheme In Cloud Computing, Jinguang Han, Willy Susilo, Yi Mu, Jun Yan
Faculty of Engineering and Information Sciences - Papers: Part A
Data transfer is a transmission of data over a point-to-point or point-to-multipoint communication channel. To protect the confidentiality of the transferred data, public-key cryptography has been introduced in data transfer schemes (DTSs). Data transfer is a transmission of data over a point-to-point or point-to-multipoint communication channel. To protect the confidentiality of the transferred data, public-key cryptography has been introduced in data transfer schemes (DTSs). Unfortunately, there exist some drawbacks in the current DTSs. First, the sender must know who the real receivers are. This is undesirable in a system where the number of the users is very large, such as …
Effect Of Niobium Clustering And Precipitation On Strength Of A Nbti-Microalloyed Ferritic Steel,
2014
University of Wollongong
Effect Of Niobium Clustering And Precipitation On Strength Of A Nbti-Microalloyed Ferritic Steel, Andrii Kostryzhev, Abdullah Alshahrani, Chen Zhu, Julie Cairney, Simon Peter Ringer, Chris Killmore, E V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
The microstructure-property relationship of an NbTi-microalloyed ferritic steel was studied as a function of thermo-mechanical schedule using Gleeble 3500 simulator, optical and scanning electron microscope, and atom probe tomography.
A Robust Smart Card-Based Anonymous User Authentication Protocol For Wireless Communications,
2014
University of Wollongong
A Robust Smart Card-Based Anonymous User Authentication Protocol For Wireless Communications, Fengtong Wen, Willy Susilo, Guomin Yang
Faculty of Engineering and Information Sciences - Papers: Part A
Anonymous user authentication is an important but challenging task for wireless communications. In a recent paper, Das proposed a smart card-based anonymous user authentication protocol for wireless communications. The scheme can protect user privacy and is believed to be secure against a range of network attacks even if the secret information stored in the smart card is compromised. In this paper, we reanalyze the security of Das’ scheme, and show that the scheme is in fact insecure against impersonation attacks. We then propose a new smart card-based anonymous user authentication protocol for wireless communications. Compared with the existing schemes, our …
Closed-Orbit Dependence On The Field Direction In The Anisotropic Diamagnetic Kepler Problem,
2014
University of Wollongong
Closed-Orbit Dependence On The Field Direction In The Anisotropic Diamagnetic Kepler Problem, A Bruno-Alfonso, Colin Bleasdale, Gustavo Alvarez, R A. Lewis
Faculty of Engineering and Information Sciences - Papers: Part A
The classical orbits of an electron with anisotropic mass interacting with a Coulomb center in the presence of a magnetic field are investigated. It is shown that the shape and duration of the closed orbits depend on the magnetic-field direction. Reasonable agreement with available experimental results for donor-doped silicon samples in a magnetic field is found, when the energy value of the conduction electron is appropriately chosen.
Mean Curvature Flow Of Entire Graphs In A Half-Space With A Free Boundary,
2014
University of Wollongong
Mean Curvature Flow Of Entire Graphs In A Half-Space With A Free Boundary, V.-M Wheeler
Faculty of Engineering and Information Sciences - Papers: Part A
We study the mean curvature flow of graphs with prescribed contact angle on a fixed, smooth hyperplane in Euclidean space. We obtain long time existence and convergence to a self similar solution of the mean curvature flow orthogonal to the fixed hyperplane.
Attribute-Based Optimistic Fair Exchange: How To Restrict Brokers With Policies,
2014
University of Wollongong
Attribute-Based Optimistic Fair Exchange: How To Restrict Brokers With Policies, Yang Wang, Man Ho Allen Au, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
Optimistic fair exchange (OFE) is a kind of protocols for solving the fair exchange problem between two participants with the help of an arbitrator that only needs to be involved when dispute occurs. As far as we are concerned, all previous work on OFE does not take into account user's attributes such as nationality and age. We identify that in some applications, the attributes could play an important role in the exchange to take place, and OFE may not be suitable to these scenarios. We introduce a new notion named attribute-based optimistic fair exchange (ABOFE) to solve the fair exchange …
Raman Scattering Reveals Strong Lo-Phonon-Hole-Plasmon Coupling In Nominally Undoped Gaasbi: Optical Determination Of Carrier Concentration,
2014
University of Wollongong
Raman Scattering Reveals Strong Lo-Phonon-Hole-Plasmon Coupling In Nominally Undoped Gaasbi: Optical Determination Of Carrier Concentration, Julian Steele, R A. Lewis, M Henini, O M. Lemine, D. Fan, Yu. I. Mazur, V G. Dorogan, P C. Grant, S Q. Yu, G J. Salamo
Faculty of Engineering and Information Sciences - Papers: Part A
We report room-temperature Raman scattering studies of nominally undoped (100) GaAs1−xBix epitaxial layers exhibiting Bi-induced (p-type) longitudinal-optical-plasmon-coupled (LOPC) modes for 0.018 ≤ x ≤ 0.048. Redshifts in the GaAs-like optical modes due to alloying are evaluated and are paralleled by strong damping of the LOPC. The relative integrated Raman intensities of LO(Γ) and LOPC ALO/ALOPC are characteristic of heavily doped p-GaAs, with a remarkable near total screening of the LO(Γ) phonon (ALO/ALOPC → 0) for larger Bi concentrations. A method of spectral analysis is set out which yields estimates of hole concentrations in excess of 5 × 1017cm−3 and correlates …
A Review Of Data Quality Assessment Methods For Public Health Information Systems,
2014
University of Wollongong
A Review Of Data Quality Assessment Methods For Public Health Information Systems, Hong Chen, David Hailey, Ning Wang, Ping Yu
Faculty of Engineering and Information Sciences - Papers: Part A
High quality data and effective data quality assessment are required for accurately evaluating the impact of public health interventions and measuring public health outcomes. Data, data use, and data collection process, as the three dimensions of data quality, all need to be assessed for overall data quality assessment. We reviewed current data quality assessment methods. The relevant study was identified in major databases and well-known institutional websites. We found the dimension of data was most frequently assessed. Completeness, accuracy, and timeliness were the three most-used attributes among a total of 49 attributes of data quality. The major quantitative assessment methods …
Optimization And Application Of Process Parameters In An Az61 Alloy Twin-Roll Strip Casting,
2014
University of Wollongong
Optimization And Application Of Process Parameters In An Az61 Alloy Twin-Roll Strip Casting, Jintao Li, Guangming Xu, Hailiang Yu, Lihong Su, Guanyu Deng, Cheng Lu, Lizi He, Huijun Li
Faculty of Engineering and Information Sciences - Papers: Part A
Twin-roll strip casting is a concerned technology for economically producing magnesium alloys sheets. In this paper, numerical simulation of the twin-roll strip casting of an AZ61 magnesium alloy was carried out and the optimal process parameters were obtained. Then, under the conditions obtained through simulation, AZ61 strips of good surface quality were successfully manufactured. The microstructure of the alloy by twin-rolled strip casting is obvious refined compared with that by conventional casting.
Climate Change Mitigation With Integration Of Renewable Energy Resources In The Electricity Grid Of New South Wales, Australia,
2014
University of Wollongong
Climate Change Mitigation With Integration Of Renewable Energy Resources In The Electricity Grid Of New South Wales, Australia, Md Abu Abdullah, Ashish Agalgaonkar, Kashem M. Muttaqi
Faculty of Engineering and Information Sciences - Papers: Part A
The implementation of climate change mitigation strategies may significantly affect the current practices for electricity network operation. Increasing penetration of renewable energy generation technologies into electricity networks is one of the key mitigation strategies to achieve greenhouse gas emission reduction targets. Additional climate change mitigation strategies can also contribute to emission reduction thereby supplementing the renewable energy generation participation, which may be limited due to technical constraints of the network. In this paper, the penetration requirements for different renewable energy generation resources are assessed while concurrently examining other mitigation strategies to reduce overall emissions from electricity networks and meet requisite …
Power Allocation Algorithm In Ofdm-Based Cognitive Radio Systems,
2014
Hung Yen University of Technology and Education
Power Allocation Algorithm In Ofdm-Based Cognitive Radio Systems, Van Vinh Nguyen, Yang Shouyi, Le Chung Tran
Faculty of Engineering and Information Sciences - Papers: Part A
In orthogonal frequency division multiplexing (OFDM)-based cognitive radio (CR) systems, the optimized algorithms for sub-carrier power allocation face the problems of complex iterative calculation and difficult realization. In this paper, we propose an exponential power distribution function and derive a sub-optimal power allocation algorithm. This algorithm aims to allocate power of in-band subcarriers of cognitive users according to the numerical characteristics of the power distribution function by using a convex optimization numerical method under linear constraints. This algorithm has the advantages of fast calculation speed and easy realization, and reduces the interference to the authorized users, which is caused by …
Smoke Detection In Video: An Image Separation Approach,
2014
University of Wollongong
Smoke Detection In Video: An Image Separation Approach, Hongda Tian, Wanqing Li, Lei Wang, Philip Ogunbona
Faculty of Engineering and Information Sciences - Papers: Part A
Existing video-based smoke detection methods often rely on the visual features extracted directly from the original frames. In the case of light smoke, the background is still visible and it deteriorates the quality of the features. This paper presents an approach to separating the smoke component from the background such that visual features can be extracted from the smoke component for reliable smoke detection. Specifically, an image is assumed to be a linear blending of a smoke component and a background image. Given a video frame and its background, the estimation of the blending parameter and the actual smoke component …
Sludge Cycling Between Aerobic, Anoxic And Anaerobic Regimes To Reduce Sludge Production During Wastewater Treatment: Performance, Mechanisms, And Implications,
2014
University of Wollongong
Sludge Cycling Between Aerobic, Anoxic And Anaerobic Regimes To Reduce Sludge Production During Wastewater Treatment: Performance, Mechanisms, And Implications, Galilee Semblante, Faisal Ibney Hai, Huu H. Ngo, Wenshan Guo, Sheng-Jie You, William Price, Long Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
Alternate cycling of sludge in aerobic, anoxic, and anaerobic regimes is a promising strategy that can reduce the sludge yield of conventional activated sludge (CAS) by up to 50% with potentially lower capital and operating cost than physical- and/or chemical-based sludge minimisation techniques. The mechanisms responsible for reducing sludge yield include alterations to cellular metabolism and feeding behaviour (metabolic uncoupling, feasting/fasting, and endogenous decay), biological floc destruction, and predation on bacteria by higher organisms. Though discrepancies across various studies are recognisable, it is apparent that sludge retention time, oxygen-reduction potential of the anaerobic tank, temperature, sludge return ratio and loading …
A New Empirical Model For Shear Strength Of Reinforced Concrete Beam - Column Connections,
2014
University of Wollongong
A New Empirical Model For Shear Strength Of Reinforced Concrete Beam - Column Connections, Tung Tran, Muhammad N. S Hadi, Thong M. Pham
Faculty of Engineering and Information Sciences - Papers: Part A
A new empirical model to estimate the joint shear strength of both exterior and interior beam-column connections is proposed. In the model, four parameters that have the most influence on joint shear strength are considered. Among these four, a new parameter is introduced to consider the bond condition and the possibility of beam bars transferring joint shear force into the columns. Consideration of this parameter in the model significantly improves the accuracy of the predicted joint shear strength. To calibrate the model, a large database of 98 reinforced concrete (RC) exterior and 73 RC interior beam-column connections displaying joint failure …
Transmit Antenna Subset Selection For High-Rate Mimo-Ofdm Systems In The Presence Of Nonlinear Power Amplifiers,
2014
University of Wollongong
Transmit Antenna Subset Selection For High-Rate Mimo-Ofdm Systems In The Presence Of Nonlinear Power Amplifiers, Phuc Ngoc Le, Farzad Safaei, Le Chung Tran
Faculty of Engineering and Information Sciences - Papers: Part A
The deployment of antenna subset selection on a per-subcarrier basis in MIMO-OFDM systems could improve the system performance and/or increase data rates. This paper investigates this technique for the MIMO-OFDM systems suffering nonlinear distortions due to high-power amplifiers. At first, some problems pertaining to the implementation of this antenna selection approach, including power imbalance across transmit antennas and non-causality of per-subcarrier antenna selection criteria, are identified. Next, an optimal selection scheme is devised by means of linear optimization to overcome those disadvantages. This scheme optimally allocates data subcarriers under a constraint that all antennas have the same number of data …
Equilibrium States On The Cuntz-Pimsner Algebras Of Self-Similar Actions,
2014
University of Victoria
Equilibrium States On The Cuntz-Pimsner Algebras Of Self-Similar Actions, Marcelo Laca, Iain Raeburn, Jacqui Ramagge, Michael Whittaker
Faculty of Engineering and Information Sciences - Papers: Part A
We consider a family of Cuntz-Pimsner algebras associated to self-similar group actions, and their Toeplitz analogues. Both families carry natural dynamics implemented by automorphic actions of the real line, and we investigate the equilibrium states (the KMS states) for these dynamical systems. We find that for all inverse temperatures above a critical value, the KMS states on the Toeplitz algebra are given, in a very concrete way, by traces on the full group algebra of the group. At the critical inverse temperature, the KMS states factor through states of the Cuntz-Pimsner algebra; if the self-similar group is contracting, then the …
Lithium Migration In Li4ti5o12 Studied Using In-Situ Neutron Powder Diffraction,
2014
University of Wollongong
Lithium Migration In Li4ti5o12 Studied Using In-Situ Neutron Powder Diffraction, Wei Kong Pang, Vanessa Peterson, Neeraj Sharma, Je-Jang Shiu, She-Huang Wu
Faculty of Engineering and Information Sciences - Papers: Part A
We used in situ neutron powder diffraction (NPD) to study the migration of Li in Li4Ti5O12 anodes with different particle sizes during battery cycling. The motivation of this work was to uncover the mechanism of the increased capacity of the battery made with a smaller-particle-sized anode. In real time, we monitored the anode lattice parameter, Li distribution, and oxidation state of the Ti atom, and these suggested an increase in the rate of Li incorporation into the anode rather than a change in the migration pathway as a result of the particle size reduction. The lattice of these anodes during …
