Mlaas: A Cloud-Based System For Delivering Adapative Micro Learning In Mobile Mooc Learning,
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.
Data-Intensive Service Provision Based On Particle Swarm Optimization,
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 …
Constant-Size Ciphertexts In Threshold Attribute-Based Encryption Without Dummy Attributes,
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 …
Trace Organic Contaminant Rejection By Aquaporin Forward Osmosis Membrane: Transport Mechanisms And Membrane Stability,
2018
Victoria University
Trace Organic Contaminant Rejection By Aquaporin Forward Osmosis Membrane: Transport Mechanisms And Membrane Stability, Ming Xie, Wenhai Luo, Hao Guo, Long D. Nghiem, Chuyang Y. Tang, Stephen Gray
Faculty of Engineering and Information Sciences - Papers: Part B
We investigated transport mechanisms of trace organic contaminants (TrOCs) through aquaporin thin-film composite forward osmosis (FO) membrane, and membrane stability under extreme conditions with respect to TrOC rejections. Morphology and surface chemistry of the aquaporin membrane were characterised to identify the incorporation of aquaporin vesicles into membrane active layer. Pore hindrance model was used to estimate aquaporin membrane pore size as well as to describe TrOC transport. TrOC transport mechanisms were revealed by varying concentration and type of draw solutions. Experimental results showed that mechanism of TrOC transport through aquaporin-embedded FO membrane was dominated by solution-diffusion mechanism. Non-ionic TrOC rejections …
Radiation Characteristics Of Natural Gamma-Ray From Coal And Gangue For Recognition In Top Coal Caving,
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 …
Inception Of Geohydraulic Failures In Granular Soils - An Experimental And Theoretical Treatment,
2018
University of Wollongong
Inception Of Geohydraulic Failures In Granular Soils - An Experimental And Theoretical Treatment, Buddhima Indraratna, Jahanzaib Israr, M Li
Faculty of Engineering and Information Sciences - Papers: Part B
This paper outlines an experimental investigation into seepage-induced failures in soils subjected to static and cyclic loading. Internally stable, marginal and unstable soils are characterised by heave, composite heave-piping and suffusion that develops immediately upon instability. In this study, the stable specimens exhibited heave at larger hydraulic gradients than the unstable specimens failing by suffusion at relatively smaller hydraulic gradients. Under no external load (i.e. self-weight only), the relative density (Rd) and particle size distribution (PSD) in tandem controlled the internal stability of soils, although the effective stress magnitude (σ′vt) also had a role to …
A New Constitutive Analysis Of Hexagonal Close-Packed Metal In Equal Channel Angular Pressing By Crystal Plasticity Finite Element Method,
2018
Tokyo Metropolitan University
A New Constitutive Analysis Of Hexagonal Close-Packed Metal In Equal Channel Angular Pressing By Crystal Plasticity Finite Element Method, Hejie Li, Andreas Öchsner, Prasad K D V Yarlagadda, Yin Xiao, Tsuyoshi Furushima, Dongbin Wei, Zhengyi Jiang, Kenichi Manabe
Faculty of Engineering and Information Sciences - Papers: Part B
Most of hexagonal close-packed (HCP) metals are lightweight metals. With the increasing application of light metal products, the production of light metal is increasingly attracting the attentions of researchers worldwide. To obtain a better understanding of the deformation mechanism of HCP metals (especially for Mg and its alloys), a new constitutive analysis was carried out based on previous research. In this study, combining the theories of strain gradient and continuum mechanics, the equal channel angular pressing process is analyzed and a HCP crystal plasticity constitutive model is developed especially for Mg and its alloys. The influence of elevated temperature on …
Compressive Behaviour Of Large Rupture Strain Frp-Confined Concrete-Encased Steel Columns,
2018
University of Wollongong
Compressive Behaviour Of Large Rupture Strain Frp-Confined Concrete-Encased Steel Columns, Le Huang, S S. Zhang, Tao Yu, Zhenyu Wang
Faculty of Engineering and Information Sciences - Papers: Part B
Fibre-reinforced polymer (FRP)-confined concrete-encased steel columns (FCSCs) have emerged as a new form of hybrid columns. An FCSC consists of an outer FRP tube, an inner steel section, and concrete filled in between. The concept of FCSCs not only provides a durable and ductile structural form for new construction, but also can be practiced as an effective method for the retrofitting/strengthening of existing steel columns. This paper presents the first ever study on FCSCs with a large rupture strain (LRS) FRP tube [i.e., polyethylene terephthalate (PET) FRP tube]. A total of 12 circular specimens (six FCSCs and six FRP-confined concrete …
Resilience And Sustainability In The Management Of Landslides,
2018
University of Wollongong
Resilience And Sustainability In The Management Of Landslides, Phillip N. Flentje, Robin N. Chowdhury
Faculty of Engineering and Information Sciences - Papers: Part A
There are many regions worldwide which are susceptible to landslides, which cause loss of life and adverse impacts to infrastructure, environment and communities. Landslides are often triggered by exceptional rainfall and large-magnitude earthquakes. A range of strategies and methods have been developed to mitigate the occurrence of landslides and to reduce their impact, including risk to human safety. The adopted approaches and systems must be sustainable and resilient in relation to the communities that are at risk. This paper refers to an Australian regional case study of urban landslide management in the Wollongong region, New South Wales. The research carried …
Police Officer Perceptions Of Organizational Justice And Body-Worn Cameras: A Civilizing Effect?,
2018
Virginia Commonwealth University
Police Officer Perceptions Of Organizational Justice And Body-Worn Cameras: A Civilizing Effect?, Carolyn Naoroz Ph.D.
Theses and Dissertations
This research sought to understand the potential association between officer perceptions of organizational justiceand officer perceptions of body-worn cameras (BWCs). A questionnaire was administered to a convenience sample of 362 officersfrom the 750 sworn personnel from the Richmond Police Department in Richmond, VA, yielding a response rate of 91% and representing 44% of the Richmond Police Department’s sworn employees. This study extends prior work by partially replicating a previous BWC survey conducted by leading body-worn camera scholars, utilizing a large sample from an urban mid-Atlantic police department. This study also extends prior work on officer perceptions of organizational justice …
Thread Effect On The Initial Stiffness Of Bolted Connections,
2018
University of Wollongong
Thread Effect On The Initial Stiffness Of Bolted Connections, Aziz Ahmed, Lip H. Teh
Faculty of Engineering and Information Sciences - Papers: Part B
This paper investigates the effect of bolt threads on the initial stiffness of double-shear bolted connections through experimental tests and numerical analyses. Eight specimens composed of 4.7 mm and 8 mm thick structural steel plates with a bolt diameter of 20 mm having varying end distances are studied. The present finite element analysis demonstrates that, as the threads cut into the connected plate, they reduce the initial stiffness of the bolted connection, which is the reason why many finite element models in the literature could not reasonably match the load-displacement curves of tested bolted connection specimens. Comparisons against alternative models …
Driving Increased Utilisation Of Cool Roofs On Large-Footprint Buildings - Final Report,
2018
University of Wollongong
Driving Increased Utilisation Of Cool Roofs On Large-Footprint Buildings - Final Report, Alan Green, Laia Ledo Gomis, Afroditi Synnefa, Shamila Haddad, R Paolini, Paul Cooper, Jamie Adams, Mark A. Eckermann, Greg Johnson, Georgios Kokogiannakis, Zhenjun Ma, Buyung Kosasih, Mattheos Santamouris
Faculty of Engineering and Information Sciences - Papers: Part B
This is the final report for the Driving Increased Utilisation of Cool Roofs on Large Footprint Buildings project, providing case studies about how cool roof technology reduces the amount of heat transmitted into buildings on hot days, and in turn the amount of air-conditioning required for cooling.
Device-To-Device Communication In 5g: Towards Efficient Scheduling,
2018
University of Wollongong
Device-To-Device Communication In 5g: Towards Efficient Scheduling, Jana Fayek, Mohamad Aoude, Mohamad Raad, Raad Raad
Faculty of Engineering and Information Sciences - Papers: Part B
5G wireless networks are expected to carry large traffic volumes due to the growth of mobile devices and the increasing demand for high data rates from applications. Device to device communication is one of the suggested technologies to support this increasing load and enhance the capacity of networks. However, the implementation of D2D communication reveals many barriers that include communication scheduling, for which the architecture remains complex and obscure. In this paper, an overview of the available literature on the implementation of networks supporting D2D communication is presented, emphasizing the complexity of the offered solutions. This paper also offers a …
Energy-Aware Routing For Cubesat Swarms,
2018
University of Wollongong
Energy-Aware Routing For Cubesat Swarms, Mohamed Atef Madni, Raad Raad, Mohamad Raad
Faculty of Engineering and Information Sciences - Papers: Part B
CubeSats operating in a swarm are characterized by a mix of scheduled intermittent connectivity, high delays, and high failure rates. Each CubeSat is limited in size, usually has low data rates and has a low mass. Consequently, they have limited space for solar panels, and thus limit their available energy. Profitably, CubeSats can function in swarms using inter-CubeSat links as well as ground links. Accordingly, any routing protocols developed for CubeSats must be energy aware. We propose two novel Shortest and Energy Reliable Path (SERP) routing protocols; namely, SERP- Breadth-First Search (SERP-BFS) and SERP-Dijkstra. Both algorithms aim to minimize the …
Fast Multi-Resource Allocation With Patterns In Large Scale Cloud Data Center,
2018
Southeast University
Fast Multi-Resource Allocation With Patterns In Large Scale Cloud Data Center, Jiyuan Shi, Junzhou Luo, Fang Dong, Jiahui Jin, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part B
How to achieve fast and efficient resource allocation is an important optimization problem of resource management in cloud data center. On one hand, in order to ensure the user experience of resource requesting, the system has to achieve fast resource allocation to timely process resource requests; on the other hand, in order to ensure the efficiency of resource allocation, how to allocate multi-dimensional resource requests to servers needs to be optimized, such that server's resource utilization can be improved. However, most of existing approaches focus on finding out the mapping of each specific resource request to each specific server. This …
Marching Schemes For Inverse Scattering Problems In Waveguides With Curved Boundaries,
2018
University of Wollongong
Marching Schemes For Inverse Scattering Problems In Waveguides With Curved Boundaries, Peng Li, Keying Liu, Weizhou Zhong
Faculty of Engineering and Information Sciences - Papers: Part B
A marching scheme is developed for inverse scattering problems of the Helmholtz equation in waveguides with curved boundaries. We implement a local orthogonal transform to transform the irregular waveguide in physical plane into a regular rectangle in computing plane. Then the modified Helmholtz system in computational domain is piecewise solved through a second order numerical marching scheme, and we propose a spectral projector based on the truncated local propagating eigenfunction expansion to regularize the marching scheme. In the end, the marching scheme is verified by extensive numerical experiments, and it is shown that the scheme is efficient, stable and accurate …
Friction And Wear Characteristics Of Tio2 Nano-Additive Water-Based Lubricant On Ferritic Stainless Steel,
2018
University of Wollongong
Friction And Wear Characteristics Of Tio2 Nano-Additive Water-Based Lubricant On Ferritic Stainless Steel, Hui Wu, Jingwei Zhao, Xiawei Cheng, Wenzhen Xia, Anshun He, Jung-Ho Yun, Shuiquan Huang, Lianzhou Wang, Han Huang, Sihai Jiao, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
The tribological behaviour of innovative TiO2 nano-additive water-based lubricant on ferritic stainless steel (FSS) 445 was characterised on a ball-on-disk tribometer. Non-oxidised (clean) and pre-oxidised FSS 445 disks with original rough surfaces were both applied in the tribological tests at room temperature. The results show that the water-based nanolubricants with concentrations of 0.4–8.0 wt% TiO2 can significantly reduce the coefficient of friction (COF) on the two types of disks. The 4.0 wt% TiO2 lubricant exhibits optimal tribological properties, including the lowest COF and the strongest anti-wear ability on the applied balls under all lubrication conditions. The lubrication …
Biocatalytic Degradation Of Pharmaceuticals, Personal Care Products, Industrial Chemicals, Steroid Hormones And Pesticides In A Membrane Distillation-Enzymatic Bioreactor,
2018
University of Wollongong
Biocatalytic Degradation Of Pharmaceuticals, Personal Care Products, Industrial Chemicals, Steroid Hormones And Pesticides In A Membrane Distillation-Enzymatic Bioreactor, Muhammad Bilal Asif, Faisal I. Hai, Jinguo Kang, Jason P. Van De Merwe, Frederic Leusch, William E. Price, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part B
Laccase-catalyzed degradation of a broad spectrum of trace organic contaminants (TrOCs) by a membrane distillation (MD)-enzymatic membrane bioreactor (EMBR) was investigated. The MD component effectively retained TrOCs (94-99%) in the EMBR, facilitating their continuous biocatalytic degradation. Notably, the extent of TrOC degradation was strongly influenced by their molecular properties. A significant degradation (above 90%) of TrOCs containing strong electron donating functional groups (e.g., hydroxyl and amine groups) was achieved, while a moderate removal was observed for TrOCs containing electron withdrawing functional groups (e.g., amide and halogen groups). Separate addition of two redox-mediators, namely syringaldehyde and violuric acid, further improved TrOC …
Concrete Filled Carbon Frp Tube (Cfrp-Cfft) Columns With And Without Cfrp Reinforcing Bars: Axial-Flexural Interactions,
2018
University of Engineering and Technology
Concrete Filled Carbon Frp Tube (Cfrp-Cfft) Columns With And Without Cfrp Reinforcing Bars: Axial-Flexural Interactions, Qasim S. Khan, M Neaz Sheikh, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
The axial and flexural behaviors of Concrete Filled Carbon Fiber Reinforced Polymer Tube (CFRP-CFFT) columns have received significant research attention in the last two decades. One of the most attractive advantages of Carbon FRP (CFRP) tube is the high confinement which results in substantial increase in peak axial and flexural loads and deformations. Despite large research efforts, the behavior of CFRP-CFFT with and without CFRP reinforcing bars under different applied axial load eccentricity has not yet been adequately investigated. This study investigates the experimental and analytical axial-flexural (P−M) interactions of CFRP-CFFT columns with and without CFRP reinforcing bars. A total …
Load Forecasting Under Changing Climatic Conditions For The City Of Sydney, Australia,
2018
University of Wollongong
Load Forecasting Under Changing Climatic Conditions For The City Of Sydney, Australia, Tanvir Ahmed, Dao Hoang Vu, Kashem M. Muttaqi, Ashish P. Agalgaonkar
Faculty of Engineering and Information Sciences - Papers: Part B
In the current context, climate change has become an unequivocal phenomenon. Although it primarily encompasses change in temperature, nevertheless other weather variables such as rainfall, wind speed, evaporation and humidity can also be affected as a result of climate change. Addressing the impacts of climate change on electricity demand is essential for predicting the future demand. For example, cooling and heating requirements change significantly with respect to climate change that may result to the change in electricity load demand. In this paper, a backward elimination based multiple regression approach is proposed for analyzing the influence of climatic variables on load …
