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Integrating Photovoltaic Thermal Collectors And Thermal Energy Storage Systems Using Phase Change Materials With Rotary Desiccant Cooling Systems, Haoshan Ren, Zhenjun Ma, Wenye Lin, Wenke Fan, Weihua Li 2018 University of Wollongong

Integrating Photovoltaic Thermal Collectors And Thermal Energy Storage Systems Using Phase Change Materials With Rotary Desiccant Cooling Systems, Haoshan Ren, Zhenjun Ma, Wenye Lin, Wenke Fan, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents a feasibility investigation of integrating a hybrid photovoltaic thermal collector-solar air heater (PVT-SAH) and an air-based thermal energy storage (TES) system using phase change materials (PCMs) with rotary desiccant cooling systems for residential applications. The PVT-SAH is used to generate both electricity and thermal energy, while the TES unit is used to solve the mismatch between energy demand for desiccant wheel regeneration and thermal energy generation from the PVT-SAH. A near-optimal design of the proposed system is first identified using the response surface method. The feasibility is then examined using three performance indicators, including Solar Thermal Contribution ...


Legged Motion Planning In Complex Three-Dimensional Environments, Andrew Short, Tirthankar Bandyopadhyay 2018 University of Wollongong

Legged Motion Planning In Complex Three-Dimensional Environments, Andrew Short, Tirthankar Bandyopadhyay

Faculty of Engineering and Information Sciences - Papers: Part B

While legged robots are well suited to navigating complex three-dimensional (3-D) environments, their practical applicability is still hampered by the time taken to plan manoeuvres to traverse these challenging environments. We present contact dynamic roadmaps (CDRM), which extend dynamic roadmaps with contact information. The CDRM is precomputed offline to generate a discretized mapping from each leg's workspace to its configuration space, and then adapted online to the environment to rapidly identify collision-free foothold positions. The concept behind this is to perform the expensive foothold candidate generation and collision checking phases offline and store the data for use in the ...


Uniqueness Theorems For Topological Higher-Rank Graph C*-Algebras, Jean Renault, Aidan Sims, Dana P. Williams, Trent M. Yeend 2018 Universite d'Orleans, France

Uniqueness Theorems For Topological Higher-Rank Graph C*-Algebras, Jean Renault, Aidan Sims, Dana P. Williams, Trent M. Yeend

Faculty of Engineering and Information Sciences - Papers: Part B

We consider the boundary-path groupoids of topological higher-rank graphs. We show that all such groupoids are topologically amenable. We deduce that the $ C^*$-algebras of topological higher-rank graphs are nuclear and prove versions of the gauge-invariant uniqueness theorem and the Cuntz-Krieger uniqueness theorem. We then provide a necessary and sufficient condition for simplicity of a topological higher-rank graph $ C^*$-algebra, and a condition under which it is also purely infinite.


Data-Intensive Service Provision Based On Particle Swarm Optimization, Lijuan Wang, Jun Shen 2018 University of Wollongong, Xidian University

Data-Intensive Service Provision Based On Particle Swarm Optimization, Lijuan Wang, Jun Shen

Faculty of Engineering and Information Sciences - Papers: Part B

The data-intensive service provision is characterized by the large of scale of services and data and also the high-dimensions of QoS. However, most of the existing works failed to take into account the characteristics of data-intensive services and the effect of the big data sets on the whole performance of service provision. There are many new challenges for service provision, especially in terms of autonomy, scalability, adaptability, and robustness. In this paper, we will propose a discrete particle swarm optimization algorithm to resolve the data-intensive service provision problem. To evaluate the proposed algorithm, we compared it with an ant colony ...


Mlaas: A Cloud-Based System For Delivering Adapative Micro Learning In Mobile Mooc Learning, Geng Sun, Tingru Cui, Jianming Yong, Jun Shen, Shiping Chen 2018 University of Wollongong

Mlaas: A Cloud-Based System For Delivering Adapative Micro Learning In Mobile Mooc Learning, Geng Sun, Tingru Cui, Jianming Yong, Jun Shen, Shiping Chen

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.


Constant-Size Ciphertexts In Threshold Attribute-Based Encryption Without Dummy Attributes, Willy Susilo, Guomin Yang, Fuchun Guo, Qiong Huang 2018 University of Wollongong

Constant-Size Ciphertexts In Threshold Attribute-Based Encryption Without Dummy Attributes, Willy Susilo, Guomin Yang, Fuchun Guo, Qiong Huang

Faculty of Engineering and Information Sciences - Papers: Part B

Attribute-based encryption (ABE) is an augmentation of public key encryption that allows users to encrypt and decrypt messages based on users’ attributes. In a ( t, s ) threshold ABE, users who can decrypt a ciphertext must hold at least t attributes among the s attributes specified by the encryptor. At PKC 2010, Herranz, Laguillaumie and Ràfols proposed the first threshold ABE with constant-size ciphertexts. In order to ensure the encryptor can flexibly select the attribute set and a threshold value, they use dummy attributes to satisfy the decryption requirement. The advantage of their scheme is that any addition or removal of ...


Data-Centric Intelligent Computing, Jun Shen, Chih-Cheng Hung, Ghassan Beydoun, Yan Li, William Guo 2018 University of Wollongong

Data-Centric Intelligent Computing, Jun Shen, Chih-Cheng Hung, Ghassan Beydoun, Yan Li, William Guo

Faculty of Engineering and Information Sciences - Papers: Part B

In the age of Big Data and Internet of Things the integration of traditional and contemporary intelligent computing techniques continues to play an increasingly vital role in data analysis, real-time control and operation, decision making, and evaluation and forecasting. Many intelligent techniques, such as fuzzy logic and genetic algorithms, were initially proposed to deal with a certain type of datasets, whose success then led to the generalization of many algorithms that can deal with common types of datasets. With the rapid advancement in pervasive computing and integration with big datasets, digital datasets in different formats have been exponentially collected from ...


Metamorphic Testing: A Review Of Challenges And Opportunities, Tsong Yueh Chen, Fei-Ching Kuo, Huai Liu, Pak-Lok Poon, Dave Towey, T H. Tse, Zhiquan Zhou 2018 Swinburne University of Technology

Metamorphic Testing: A Review Of Challenges And Opportunities, Tsong Yueh Chen, Fei-Ching Kuo, Huai Liu, Pak-Lok Poon, Dave Towey, T H. Tse, Zhiquan Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

Metamorphic testing is an approach to both test case generation and test result verification. A central element is a set of metamorphic relations, which are necessary properties of the target function or algorithm in relation to multiple inputs and their expected outputs. Since its first publication, we have witnessed a rapidly increasing body of work examining metamorphic testing from various perspectives, including metamorphic relation identification, test case generation, integration with other software engineering techniques, and the validation and evaluation of software systems. In this article, we review the current research of metamorphic testing and discuss the challenges yet to be ...


The Effect Of A Dissipative Ladle Shroud On Mixing In Tundish: Mathematical And Experimental Modelling, Jiangshan Zhang, Shufeng Yang, Jingshe Li, Haiyan Tang, Zhengyi Jiang 2018 University of Wollongong

The Effect Of A Dissipative Ladle Shroud On Mixing In Tundish: Mathematical And Experimental Modelling, Jiangshan Zhang, Shufeng Yang, Jingshe Li, Haiyan Tang, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

The effect of a dissipative ladle shroud (DLS) on mixing in tundish was investigated, compared with that of a conventional ladle shroud (CLS) using mathematical and physical modelling. The tracer profiles of mathematical results, achieved using large eddy simulation, were validated by physical observations employing high-speed cinephotography. The design of a DLS dramatically changed the flow patterns and contributed the intermixing of fluid elements inside the ladle shroud. The vortex flow encouraged the turbulent mixing and was verified by tracking of physical tracer dispersion inside the DLS. Residence Time Distribution (RTD) curves were obtained in two different sized tundishes to ...


Radiation Characteristics Of Natural Gamma-Ray From Coal And Gangue For Recognition In Top Coal Caving, Ningbo Zhang, Changyou Liu 2018 China University of Mining and Technology, University of Wollongong

Radiation Characteristics Of Natural Gamma-Ray From Coal And Gangue For Recognition In Top Coal Caving, Ningbo Zhang, Changyou Liu

Faculty of Engineering and Information Sciences - Papers: Part B

Recognition of coal and gangue (roof rock) is a key technology to realize fully mechanized top coal caving automated mining. This paper proposes to detect the instantaneous refuse content of drawn coal and gangue mixture during top coal caving by using natural gamma-ray technology. The generating environment of coal and rock seams, the distribution characteristics of natural gamma ray from coal and roof-rock and the principle of coal-gangue recognition using natural gamma-ray method were analyzed. The natural gamma ray radiation characteristics of coal and roof-rock seams from seven different typical coal mine areas who has thick coal seams in China ...


Integrated Active And Semi-Active Control For Seat Suspension Of A Heavy Duty Vehicle, Donghong Ning, Shuaishuai Sun, Haiping Du, Weihua Li 2018 University of Wollongong

Integrated Active And Semi-Active Control For Seat Suspension Of A Heavy Duty Vehicle, Donghong Ning, Shuaishuai Sun, Haiping Du, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

In this article, an integrated active and semi-active seat suspension for heavy duty vehicles is proposed, and its prototype is built; an integrated control algorithm applied measurable variables (suspension relative displacement and seat acceleration) is designed for the proposed seat prototype. In this seat prototype, an active actuator with low maximum force output (70 N), which is insufficient for an active seat suspension to control the resonance vibration, is applied together with a rotary magnetorheological damper. The magnetorheological damper can suppress the high vibration energy in resonance frequency, and then a small active force can further improve the seat suspension ...


Multiple Speech Source Separation Using Inter-Channel Correlation And Relaxed Sparsity, Maoshen Jia, Jundai Sun, Xiguang Zheng 2018 Beijing University of Technology

Multiple Speech Source Separation Using Inter-Channel Correlation And Relaxed Sparsity, Maoshen Jia, Jundai Sun, Xiguang Zheng

Faculty of Engineering and Information Sciences - Papers: Part B

In this work, a multiple speech source separation method using inter-channel correlation and relaxed sparsity is proposed. A B-format microphone with four spatially located channels is adopted due to the size of the microphone array to preserve the spatial parameter integrity of the original signal. Specifically, we firstly measure the proportion of overlapped components among multiple sources and find that there exist many overlapped time-frequency (TF) components with increasing source number. Then, considering the relaxed sparsity of speech sources, we propose a dynamic threshold-based separation approach of sparse components where the threshold is determined by the inter-channel correlation among the ...


Thin Silicon Microdosimeter Utilizing 3d Mems Fabrication Technology: Charge Collection Study And Its Application In Mixed Radiation Fields, Linh T. Tran, Lachlan Chartier, Dale A. Prokopovich, David Bolst, Marco Povoli, Anand Summanwar, Angela Kok, Alex Pogossov, Marco Petasecca, Susanna Guatelli, Mark I. Reinhard, Michael L. F Lerch, MItchell John Bromley Nancarrow, Naruhiro Matsufuji, Michael A. Jackson, Anatoly B. Rosenfeld 2018 University of Wollongong

Thin Silicon Microdosimeter Utilizing 3d Mems Fabrication Technology: Charge Collection Study And Its Application In Mixed Radiation Fields, Linh T. Tran, Lachlan Chartier, Dale A. Prokopovich, David Bolst, Marco Povoli, Anand Summanwar, Angela Kok, Alex Pogossov, Marco Petasecca, Susanna Guatelli, Mark I. Reinhard, Michael L. F Lerch, Mitchell John Bromley Nancarrow, Naruhiro Matsufuji, Michael A. Jackson, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

New 10-μm-thick silicon microdosimeters utilizing 3-D technology have been developed and investigated in this paper. The TCAD simulations were carried out to understand the electrical properties of the microdosimeters' design. A charge collection study of the devices was performed using 5.5-MeV He2+ ions which were raster scanned over the surface of the detectors and the charge collection median energy maps were obtained and the detection yield was also evaluated. The devices were tested in a 290 MeV/u carbon ion beam at the Heavy Ion Medical Accelerator in Chiba (HIMAC) in Japan. Based on the microdosimetric measurements, the ...


Developing A Theoretical Model And Questionnaire Survey Instrument To Measure The Success Of Electronic Health Records In Residential Aged Care, Ping Yu, Siyu Qian 2018 University of Wollongong

Developing A Theoretical Model And Questionnaire Survey Instrument To Measure The Success Of Electronic Health Records In Residential Aged Care, Ping Yu, Siyu Qian

Faculty of Engineering and Information Sciences - Papers: Part B

Electronic health records (EHR) are introduced into healthcare organizations worldwide to improve patient safety, healthcare quality and efficiency. A rigorous evaluation of this technology is important to reduce potential negative effects on patient and staff, to provide decision makers with accurate information for system improvement and to ensure return on investment. Therefore, this study develops a theoretical model and questionnaire survey instrument to assess the success of organizational EHR in routine use from the viewpoint of nursing staff in residential aged care homes. The proposed research model incorporates six variables in the reformulated DeLone and McLean information systems success model ...


Comparative Effect Of Mo And Cr On Microstructure And Mechanical Properties In Nbv-Microalloyed Bainitic Steels, Andrii Kostryzhev, Navjeet Singh, Liang Chen, Chris R. Killmore, Elena V. Pereloma 2018 University of Wollongong

Comparative Effect Of Mo And Cr On Microstructure And Mechanical Properties In Nbv-Microalloyed Bainitic Steels, Andrii Kostryzhev, Navjeet Singh, Liang Chen, Chris R. Killmore, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part B

Steel product markets require the rolled stock with further increasing mechanical properties and simultaneously decreasing price. The steel cost can be reduced via decreasing the microalloying elements contents, although this decrease may undermine the mechanical properties. Multi-element microalloying with minor additions is the route to optimise steel composition and keep the properties high. However, this requires deep understanding of mutual effects of elements on each other's performance with respect to the development of microstructure and mechanical properties. This knowledge is insufficient at the moment. In the present work we investigate the microstructure and mechanical properties of bainitic steels microalloyed ...


Formation Of Deformation-Induced Products In A Metastable-B Titanium Alloy During High Temperature Compression, Alireza Samiee, Gilberto Casillas, Mansur Ahmed, Dmytro G. Savvakin, Ryan Naseri, Elena V. Pereloma 2018 University of Wollongong

Formation Of Deformation-Induced Products In A Metastable-B Titanium Alloy During High Temperature Compression, Alireza Samiee, Gilberto Casillas, Mansur Ahmed, Dmytro G. Savvakin, Ryan Naseri, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part B

A metastable-β titanium alloy, Ti-10V-3Fe-3Al (wt. %), was subjected to thermo-mechanical processing including the compression test at 725 °C, which is below the β transus temperature (780 °C), and at strain rate of 10−3 s−1. The presence of phases was determined using transmission electron microscopy and X-ray diffraction. Although the dynamic recovery took place together with slip, both deformation-induced α” martensite and ω were detected as other operating mechanisms for the first time in metastable-β titanium alloy deformed in α + β region. The volume fraction of stress-induced α” was higher than that of the same alloy deformed at room ...


Kms States On Generalised Bunce-Deddens Algebras And Their Toeplitz Extensions, David I. Robertson, James Rout, Aidan Sims 2018 University of Wollongong

Kms States On Generalised Bunce-Deddens Algebras And Their Toeplitz Extensions, David I. Robertson, James Rout, Aidan Sims

Faculty of Engineering and Information Sciences - Papers: Part B

We study the generalised Bunce-Deddens algebras and their Toeplitz extensions constructed by Kribs and Solel from a directed graph and a sequence ω of positive integers. We describe both of these C∗-algebras in terms of novel universal properties, and prove uniqueness theorems for them; if ω determines an infinite supernatural number, then no aperiodicity hypothesis is needed in our uniqueness theorem for the generalised Bunce-Deddens algebra. We calculate the KMS states for the gauge action in the Toeplitz algebra when the underlying graph is finite. We deduce that the generalised Bunce-Deddens algebra is simple if and only if it ...


On Statistical Approaches To Generate Level 3 Products From Satellite Remote Sensing Retrievals, Andrew Zammit-Mangion, Noel A. Cressie, Clint E. Shumack 2018 University of Wollongong

On Statistical Approaches To Generate Level 3 Products From Satellite Remote Sensing Retrievals, Andrew Zammit-Mangion, Noel A. Cressie, Clint E. Shumack

Faculty of Engineering and Information Sciences - Papers: Part B

Satellite remote sensing of trace gases such as carbon dioxide (CO 2 ) has increased our ability to observe and understand Earth's climate. However, these remote sensing data, specifically Level 2 retrievals, tend to be irregular in space and time, and hence, spatio-temporal prediction is required to infer values at any location and time point. Such inferences are not only required to answer important questions about our climate, but they are also needed for validating the satellite instrument, since Level 2 retrievals are generally not co-located with ground-based remote sensing instruments. Here, we discuss statistical approaches to construct Level 3 ...


Quality Evaluation Tests For Tensile Strength Of Reactive Powder Concrete, Hussamaldeen GOAIZ, Tao Yu, Muhammad N. S Hadi 2018 University of Wollongong

Quality Evaluation Tests For Tensile Strength Of Reactive Powder Concrete, Hussamaldeen Goaiz, Tao Yu, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

This study presents a comparison between different testing procedures to determine the tensile strength of reactive powder concrete (RPC). The tensile strength test methods include a direct tensile test and two indirect tensile tests, the splitting test and the double punch test (DPT). In this study, the RPC was designed to obtain a nominal compressive strength of 100 MPa at the age of 28 days. Macro steel fibers were used to reinforce the RPC by volumetric percentages of 0, 1, 2, and 3%. Mechanical properties of RPC were obtained at 28 days such as compressive, tensile, and flexural strengths; compressive ...


Development Of A Nonlinear Adaptive Absorber Based On Magnetorheological Elastomer, Shuaishuai Sun, Jian Yang, Tanju Yildirim, Haiping Du, Gursel Alici, Shiwu Zhang, Weihua Li 2018 University of Wollongong

Development Of A Nonlinear Adaptive Absorber Based On Magnetorheological Elastomer, Shuaishuai Sun, Jian Yang, Tanju Yildirim, Haiping Du, Gursel Alici, Shiwu Zhang, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

The resonance shift property of magnetorheological elastomer is important for developing adaptive absorbers. However, it is well-known that passive nonlinear absorbers have wider effective frequency bandwidths. This article combines these two characteristics in order to develop a hybrid magnetorheological elastomer absorber which can shift its natural frequency and has a wider absorption bandwidth under each constant current. The adaptability and nonlinearity were fully verified experimentally. Afterwards, the absorption ability of the hybrid magnetorheological elastomer absorber was investigated and analyzed. The results show that the effective bandwidth of this absorber is broadened under certain levels of current than linear absorber, and ...


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