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Articles 1 - 30 of 581
Full-Text Articles in Science and Technology Studies
Fast Operations For Certain Two Alphabet Circulant Matrices, Gene Awyzio, Jennifer Seberry
Fast Operations For Certain Two Alphabet Circulant Matrices, Gene Awyzio, Jennifer Seberry
Faculty of Engineering and Information Sciences - Papers: Part A
In order to efficiently compute some combinatorial designs based upon circulant matrices which have different, defined numbers of 1's and 0's in each row and column we need to find candidate vectors with differing weights and Hamming distances. This paper concentrates on how to efficiently create such circulant matrices. These circulant matrices have applications in signal processing, public key codes and spectography
Design And Evaluation Of A Linear Damper Working With Mr Shear Thickening Fluids, Tongfei Tian, Weihua Li, Masami Nakano
Design And Evaluation Of A Linear Damper Working With Mr Shear Thickening Fluids, Tongfei Tian, Weihua Li, Masami Nakano
Faculty of Engineering and Information Sciences - Papers: Part A
Magnetorheological (MR) materials and shear thickening fluids are both smart material and their combination could offer both MR and ST effects. This study looks at the properties and behaviour of magnetorheological shear thickening fluid (MRSTF) in particular whilst applied as a semi-active energy absorber. A device with two forms of varying vibration control has been created and measured. The result shows that this MRSTF filled damper showed both MR and properties.
A Novel Mr Device With Variable Stiffness And Damping Capability, Shiyu Zhao, Huaxia Deng, Jin Zhang, Liandong Yu, Shuaishuai Sun, Weihua Li, Laijun Zhou
A Novel Mr Device With Variable Stiffness And Damping Capability, Shiyu Zhao, Huaxia Deng, Jin Zhang, Liandong Yu, Shuaishuai Sun, Weihua Li, Laijun Zhou
Faculty of Engineering and Information Sciences - Papers: Part A
This paper proposes a novel device based on the Magnetorheological (MR) fluid which has the capability to change stiffness and damping under control. MR fluid is a type of smart material whose properties could be controlled by the external magnetic field. Most of MR devices are MR dampers, which normally are used as variable damping devices. The presented device consists of two hydro-cylinder-spring structures and one MR valve linking these two structures. The rheological characteristics of MR fluid in the fluid flow channels of MR valve are controlled by the strength of magnetic fields, which directly affect the link conditions. …
Service Quality, Citizen Satisfaction, And Loyalty With Self-Service Delivery Options To Transforming E-Government Services, Akemi Chatfield, Jazem Alanazi
Service Quality, Citizen Satisfaction, And Loyalty With Self-Service Delivery Options To Transforming E-Government Services, Akemi Chatfield, Jazem Alanazi
Faculty of Engineering and Information Sciences - Papers: Part A
With the growing recognition of the citizen's role in service demand and self-service delivery, there is an increased impetus on building citizen satisfaction and loyalty with government's e-services. With the global trend in transforming government services through e-government, research on citizen interactions with web-based selfservice delivery options has been recently emerging in IS and e-government literatures. This study aims to contribute to post-adoption research by developing a model of citizen loyalty with government online self-service delivery options. We empirically test the proposed model through an analysis of 402 survey data collected from Saudi citizens/users of e-government transactional services. Multiple regression …
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 …
Angular Rebinning For Geometry Independent Spect Reconstruction, Alexandre Bousse, Kjell Erlandsson, Stefano Pedemonte, Sebastien Ourselin, Simon Arridge, Brian F. Hutton
Angular Rebinning For Geometry Independent Spect Reconstruction, Alexandre Bousse, Kjell Erlandsson, Stefano Pedemonte, Sebastien Ourselin, Simon Arridge, Brian F. Hutton
Faculty of Engineering and Information Sciences - Papers: Part A
This work proposes a novel approach to model the collimator response in SPECT. The approach consists of projecting the activity volume on a high number of virtual projection planes that are then averaged with an angular point spread function. It was motivated by the new possibilities offered by GPU for 3-D projection/backprojection. This approach also allows to model a wide range of SPECT imaging systems. Results show that reconstruction using our resolution modelling method is consistent with standard blurring. As an example, we show how to implement a convergent collimator response.
Creating Value Through Virtual Teams: A Current Literature Review, Akemi Chatfield, V Najem Shlemoon, Wilbur Redublado, Gary Darbyshire
Creating Value Through Virtual Teams: A Current Literature Review, Akemi Chatfield, V Najem Shlemoon, Wilbur Redublado, Gary Darbyshire
Faculty of Engineering and Information Sciences - Papers: Part A
Globally, virtual teams (VT) as ICT-enabled emergent network organisation forms have gained international validity by innovative organisations, with a corresponding surge of interest in understanding how organisations can leverage VT to create business value. Despite growing deliberations in VT literature on managing VT, tasks and outcomes, however, creating business value through VT remains an unresolved theoretical and pragmatic conundrum. A review of prior relevant literature is essential to advancing knowledge. The paucity of published review articles seems to have impeded the field's accumulation of VT knowledge. This research, therefore, reviews the current literature on case studies of VT to address …
The Game Of Information Systems Higher Education, Mark Freeman, Alison E. Freeman
The Game Of Information Systems Higher Education, Mark Freeman, Alison E. Freeman
Faculty of Engineering and Information Sciences - Papers: Part A
With continual changes in higher education in the field of Information Systems (IS), educators are faced with the question: how can we actively engage each learner in a way that encourages self-direction while developing the ability to independently solve problems? The unique learning characteristics of adult learners must each be considered in the design of learning experiences in higher education environments. Gamification - the use of gaming elements in non-gaming contexts - is one source of opportunities for new and interesting learning experiences. Through discussion of 12 major gaming elements, this paper considers whether gamification can create innovative learning environments …
A Bi-Level Decision Model For Customer Churn Analysis, Ya Gao, Guangquan Zhang, Jie Lu, Jun Ma
A Bi-Level Decision Model For Customer Churn Analysis, Ya Gao, Guangquan Zhang, Jie Lu, Jun Ma
Faculty of Engineering and Information Sciences - Papers: Part A
This paper develops a bi-level decision model and a solution approach to optimizing service features for a company to reduce its customer churn rate. First, a bi-level decision model, together with its modeling approach, are developed to describe the gaming relationship between decision makers in a company (service provider) and its customers. Then, a practical solution approach to reaching solutions for the bi-level-modeled customer churn problem is developed. Finally, experiments and case studies are conducted to illustrate the bi-level decision model and the solution approach.
Embracing Complexity In Engineering Education: A Way Forward For Developing Intercultural Competency, Thomas Goldfinch
Embracing Complexity In Engineering Education: A Way Forward For Developing Intercultural Competency, Thomas Goldfinch
Faculty of Engineering and Information Sciences - Papers: Part A
towards engineering education that prepares graduates to work effectively across foreign cultures and customs1-3. The author argues that while this outward focus is important and necessary, there is also a need to focus on preparing graduates for cultural issues that will arise much closer to home. Identifying, and working with subtle cultural differences that can occur in workplaces, organizations and the community, where the population may initially appear monocultural, presents unique challenges. The way in which one assumes cultural uniformity in a given situation can contribute to the oversimplification of a problem, and subsequently the pursuit of ineffective solutions. In …
The Tunable Wettability In Multistimuli-Responsive Smart Graphene Surfaces, Shanhong Wan, Jibin Pu, Xiaoqian Zhang, Liping Wang, Qunji Xue
The Tunable Wettability In Multistimuli-Responsive Smart Graphene Surfaces, Shanhong Wan, Jibin Pu, Xiaoqian Zhang, Liping Wang, Qunji Xue
Faculty of Engineering and Information Sciences - Papers: Part A
The tunable wettability of smart graphene films onto stainless steel substrates with a multi-response to different environmental stimuli has been investigated including light irradiation, pH, electric field, and annealing temperature. Conductive graphene film exhibited the controllable transition from water-repellent to water-loving characteristic in response to different environment fields, which primarily resulted from the morpho-chemically synergistic effect as well as the restoration of electronic stucture. Based on the fundamental theories of wettability, mechanisms in switching from hydrophobicity to hydrophilicity for smart graphene surface including thermal chemistry, electrostatic, photo-induced surface chemistry, solvent, and pH methods were presented.
Simplified Finite Element Modelling Of End Cover Separation In Rc Beams Flexurally-Strengthened With Bonded Frp Reinforcement, S S. Zhang, J G. Teng
Simplified Finite Element Modelling Of End Cover Separation In Rc Beams Flexurally-Strengthened With Bonded Frp Reinforcement, S S. Zhang, J G. Teng
Faculty of Engineering and Information Sciences - Papers: Part A
The flexural performance of RC beams can be improved using externally bonded (EB) or near-surface mounted (NSM) fibre-reinforced polymer (FRP) reinforcement. One of the commonly observed failure modes of such FRP-strengthened RC beams is the end cover separation failure mode which involves the detachment of the bonded FRP reinforcement together with the cover concrete along the level of the longitudinal steel reinforcement. This paper presents a simplified finite element (FE) model for end cover separation failure in RC beams flexurally-strengthened with either EB or NSM FRP. In this simplified FE model, only the part of the RC beam between the …
Numerical Study On Interaction Between Steel Stirrups And Shear- Strengthening Nsm Frp Strips In Rc Beams, G M. Chen, S W. Li, S S. Zhang, J F. Chen, J G. Teng
Numerical Study On Interaction Between Steel Stirrups And Shear- Strengthening Nsm Frp Strips In Rc Beams, G M. Chen, S W. Li, S S. Zhang, J F. Chen, J G. Teng
Faculty of Engineering and Information Sciences - Papers: Part A
RC beams shear-strengthened with externally bonded or near-surface mounted (NSM) FRP reinforcement usually fail by the debonding of FRP in a brittle manner. When the FRP reinforcement debonds, the internal steel stirrups may have not reached their yield strength, so the contribution of the latter to the shear resistance of the beam is compromised to some extent. This phenomenon is referred to as the adverse shear interaction between the steel stirrups and the bonded FRP shear reinforcement. This paper examines such shear interaction in RC beams shear strengthened with NSM FRP strips using a simple computational model. Numerical results obtained …
Seismic Retrofit Of Rc Frames Through Beam-End Weakening In Conjunction With Frp Strengthening, J G. Teng, S S. Zhang, D H. Jing, X F. Nie, G M. Chen
Seismic Retrofit Of Rc Frames Through Beam-End Weakening In Conjunction With Frp Strengthening, J G. Teng, S S. Zhang, D H. Jing, X F. Nie, G M. Chen
Faculty of Engineering and Information Sciences - Papers: Part A
The strong column/weak beam requirement is now widely accepted in the design of reinforced concrete (RC) frames to achieve good seismic performance. However, many existing RC frames violate this requirement as they were designed according to inadequate design codes (generally previous codes). In particular, RC frames designed according to the previous Chinese codes for seismic design are likely to violate this requirement as the contribution of a cast-in-place floor slab in tension is not included in assessing the moment capacity of the beam in negative bending. This paper proposes three promising beam weakening techniques in combination with FRP strengthening to …
Bond-Slip Model For Interfaces Between Near-Surface Mounted Cfrp Strips And Concrete, S S. Zhang, J G. Teng, T Yu
Bond-Slip Model For Interfaces Between Near-Surface Mounted Cfrp Strips And Concrete, S S. Zhang, J G. Teng, T Yu
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a bond-slip model for interfaces between near-surface mounted (NSM) CFRP strips and concrete where debonding occurs due to cohesion failure in the concrete adjacent to the CFRP strip. This bond-slip model was derived on the basis of numerical results from a parametric study conducted using a verified 3-D meso-scale finite element (FE) model. In the proposed bond-slip model, the concrete compressive strength and the groove height-to-width ratio are the two main parameters: the former indicates how strong the concrete itself is while the latter represents the level of confinement provided by the surrounding concrete to the bonded …
Practical Fabrication And Analysis Of An Optimized Compact Eight-Channel Silicon Arrayed-Waveguide Grating, Hongqiang Li, Yaoting Bai, Xiaye Dong, Enbang Li, Yang Li, Wenqian Zhou, Yu Liu
Practical Fabrication And Analysis Of An Optimized Compact Eight-Channel Silicon Arrayed-Waveguide Grating, Hongqiang Li, Yaoting Bai, Xiaye Dong, Enbang Li, Yang Li, Wenqian Zhou, Yu Liu
Faculty of Engineering and Information Sciences - Papers: Part A
We have designed, fabricated, and characterized a 1 x 8 ultrasmall compact arrayed-waveguide grating (AWG) on silicon-on-insulator (SOI) in a fiber grating demodulation integration microsystem. The miniature AWG, consisting of Si photonic wire waveguides, was designed using the complete modeling simulation in the beam propagation method. The device was fabricated on an SOI substrate and evaluated in the wavelength range around 1.55 μm, with an effective area of 230 x 160 μm. Clear demultiplexing characteristics were observed with a channel spacing of 1.91 nm. The influence of the waveguide widths on crosstalk defined by adjacent channel crosstalk and phase error …
Experimental Demonstration And Analysis Of Compact Silicon-Nanowire-Based Couplers, Hongqiang Li, Xiaye Dong, Yaoting Bai, Enbang Li, Yang Li, Yu Liu, Wenqian Zhou
Experimental Demonstration And Analysis Of Compact Silicon-Nanowire-Based Couplers, Hongqiang Li, Xiaye Dong, Yaoting Bai, Enbang Li, Yang Li, Yu Liu, Wenqian Zhou
Faculty of Engineering and Information Sciences - Papers: Part A
Compact 2 x 2 couplers based on silicon nanowires are fabricated and tested. They include a directional (X) coupler, a cross-gap coupler (CGC), and a multimode interference (MMI) coupler. The length of the X coupler's parallel film waveguide is 1 μm. The theoretical minimum excess loss of the X coupler is 0.73 dB, whereas its experimental value is 1.0817 dB. CGC has a coupling region length of 24 μm. The minimum excess loss of CGC, which is 0.6 dB in theory, is experimentally determined to be 0.6737 dB. Taper waveguides are used as input/output waveguides for the MMI coupler. The …
Response Of Substandard Reinforcing Details T Connections Upgraded With Concrete Covers And Cfrp, Tung M. Tran, B Matuszkiewicz, Muhammad N. S Hadi
Response Of Substandard Reinforcing Details T Connections Upgraded With Concrete Covers And Cfrp, Tung M. Tran, B Matuszkiewicz, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part A
This paper introduces the responses of two substandard reinforcing details exterior beam-column T connections, which were upgraded by a new retrofitting method using concrete covers and carbon fiber reinforced polymer (CFRP). Two reinforced concrete (RC) exterior beam-column connections without transverse reinforcement at the joints were cast and tested. A mix of epoxy resin and 20% thickener was used to glue the first connection (the Strengthened specimen, TS) with the concrete covers around the column at the joint area to modify it from a square to a circular section and then it was wrapped with CFRP to strengthen. A load was …
Redefining Zero? A Critical Review Of Definitions Of Zero Energy Buildings And Zero Carbon Homes, Emma Elizabeth Heffernan, Wei Pan, Xi Liang, Pieter De Wilde
Redefining Zero? A Critical Review Of Definitions Of Zero Energy Buildings And Zero Carbon Homes, Emma Elizabeth Heffernan, Wei Pan, Xi Liang, Pieter De Wilde
Faculty of Engineering and Information Sciences - Papers: Part A
From 2016 all new homes in the UK will be required, by law, to be 'zero carbon'. However, the detail of the Zero Carbon Homes standard is still being developed. Internationally there has been much debate on a definition for zero energy; though a consensus has yet to emerge. This paper presents an overview and synthesis of the literature on such definitions. Through a critical review, a series of options for the determination of a 'zero energy' or 'zero carbon' balance are revealed; the extent to which each option fully accounts for the energy consumed is also considered. The results …
Application Of Mbse To Requirements Engineering - Research Challenges, Mike Ryan, Stephen Cook, William R. Scott
Application Of Mbse To Requirements Engineering - Research Challenges, Mike Ryan, Stephen Cook, William R. Scott
Faculty of Engineering and Information Sciences - Papers: Part A
Models and simulations have always played an important role in engineering and systems engineering. Physical scale models, full-sized models, and computer models are commonly used in all forms of engineering and design. In recent times, interest in modelling has increased to span the full system lifecycle and there has been a significant focus on Model-based Systems Engineering (MBSE). The extension of formal modelling into all phases, and particularly the conceptual design phase, of a system development is a significant step and proponents of MBSE suggest that it will provide considerable benefits. The application of modelling requires considerable care, however. A …
Wear Mode Map Evaluation Of Induction Hardened 4140 And Carburised 8617h Steels On 1040 Steel, Alain Kusmoko, Alan Crosky
Wear Mode Map Evaluation Of Induction Hardened 4140 And Carburised 8617h Steels On 1040 Steel, Alain Kusmoko, Alan Crosky
Faculty of Engineering and Information Sciences - Papers: Part A
This study was undertaken to evaluate the likely effect on the wear rate of changing the pinion material in a rack and pinion steering box from carburised SAE-AISI grade 8617 H steel to induction hardened SAE-AISI grade 4140 steel. Accordingly, pin-on-disc unlubricated wear tests were conducted using carburised 8617 H pins and through hardened 4140 pins. The surface hardness of the pins was approximately 60 HRC for both materials. The discs were made of SAE-AISI grade 1040 steel through hardened to a hardness of 45 HRC. The tests were conducted using a load of 2.2 kg and a rotational speed …
Compare Pilot-Scale And Industry-Scale Models Of Pulverized Coal Combustion In An Ironmaking Blast Furnace, Yansong Shen, Aibing Yu, Paul Zulli
Compare Pilot-Scale And Industry-Scale Models Of Pulverized Coal Combustion In An Ironmaking Blast Furnace, Yansong Shen, Aibing Yu, Paul Zulli
Faculty of Engineering and Information Sciences - Papers: Part A
In order to understand the complex phenomena of pulverized coal injection (PCI) process in blast furnace (BF), mathematical models have been developed at different scales: pilot-scale model of coal combustion and industry-scale model (in-furnace model) of coal/coke combustion in a real BF respectively. This paper compares these PCI models in aspects of model developments and model capability. The model development is discussed in terms of model formulation, their new features and geometry/regions considered. The model capability is then discussed in terms of main findings followed by the model evaluation on their advantages and limitations. It is indicated that these PCI …
Effects Of Long-Distance Walking On Socket-Limb Interface Pressure, Tactile Sensitivity And Subjective Perceptions Of Trans-Tibial Amputees, L F. Yeung, Aaron Leung, Ming Zhang, Winson Lee
Effects Of Long-Distance Walking On Socket-Limb Interface Pressure, Tactile Sensitivity And Subjective Perceptions Of Trans-Tibial Amputees, L F. Yeung, Aaron Leung, Ming Zhang, Winson Lee
Faculty of Engineering and Information Sciences - Papers: Part A
PURPOSE: Many trans-tibial amputees could not tolerate long-distance walking. Lack of walking could explain for the increased cardiovascular diseases mortality rate. This study investigated the effects of long-distance walking (LDW) on socket-limb interface pressure, tactile sensitivity of the residual limb, and subjective feedbacks, which potentially identified the difficulties in LDW. METHOD: Five male unilateral trans-tibial amputees walked on a level treadmill for a total of one hour at comfortable speed. Tactile sensitivity of the residual limb and socket-limb interface pressure during over-ground walking were measured before and after the treadmill walking. Modified Prosthesis Evaluation Questionnaires were also administered. RESULTS: After …
Two-Dimensional Cfd Modelling Of Gas-Decompression Behaviour, Alhoush Elshahomi, Cheng Lu, Guillaume Michal, Xiong Liu, Ajit R. Godbole, K K. Botros, Phillip Venton, Philip Colvin
Two-Dimensional Cfd Modelling Of Gas-Decompression Behaviour, Alhoush Elshahomi, Cheng Lu, Guillaume Michal, Xiong Liu, Ajit R. Godbole, K K. Botros, Phillip Venton, Philip Colvin
Faculty of Engineering and Information Sciences - Papers: Part A
ONE OF THE key issues in the design and construction of any gas pipeline is the prevention of material fracture. Since the gas is generally transported under high operating pressures, it must be ensured that the gas pipeline is sufficiently tough to arrest the propagation of any potential fracture. For several decades, control of gas pipeline fracture propagation has been under scrutiny due to economic considerations and ecological and safety hazards related to pressurised pipe failure. The Battelle Two Curve approach has been widely used to determine the minimum material arrest toughness by comparing the gas decompression wave velocity with …
Factors Associated With Differences In Quit Rates Between 'Specialist' And 'Community' Stop-Smoking Practitioners In The English Stop-Smoking Services, Mairtin S. Mcdermott, Emma Beard, Leonie S. Brose, Robert West, Andy Mcewen
Factors Associated With Differences In Quit Rates Between 'Specialist' And 'Community' Stop-Smoking Practitioners In The English Stop-Smoking Services, Mairtin S. Mcdermott, Emma Beard, Leonie S. Brose, Robert West, Andy Mcewen
Faculty of Engineering and Information Sciences - Papers: Part A
Introduction: Behavioral support improves smokers' chances of quitting, but quit rates are typically lower for smokers supported by "community practitioners" for whom smoking cessation is a small part of their job than for those supported by "specialist practitioners" for whom it is the main role. This article examined the factors that might contribute to this. Method: A total of 573 specialist practitioners and 466 community practitioners completed a 42-item online survey that covered demographic and employment information, current practices, levels of training, and 4-week CO-verified quit rates. Responses were compared for community and specialist practitioners. Mediation analysis was undertaken to …
Should Users Pay The Toll For Australia's Infrastructure Problem?, Garry Bowditch
Should Users Pay The Toll For Australia's Infrastructure Problem?, Garry Bowditch
Faculty of Engineering and Information Sciences - Papers: Part A
Australia spends more on infrastructure today than at any stage in its history. Yet governments are unable to meet demand and don't expect ever to do so. What can governments do to keep up with escalating demand and community expectations for infrastructure? Reserve Bank assistant governor Philip Lowe says tolls and levies could be the answer to more efficiently funding the transport infrastructure we need - infrastructure he says would boost productivity and improve living standards. Tolls are just one issue likely to be debated as part of the Productivity Commission's current inquiry into infrastructure costs, which is considering how …
Australia's Infrastructure Cost Conundrum, Garry Bowditch
Australia's Infrastructure Cost Conundrum, Garry Bowditch
Faculty of Engineering and Information Sciences - Papers: Part A
Infrastructure is about the long-term growth and prosperity of a nation, but Australia will get very little of this benefit if the cost of building it continues to rapidly escalate. Australia is becoming increasingly uncompetitive in design and delivery of major projects. This is an unacceptable situation, and a newly commissioned multi-state inquiry by the SMART Infrastructure Facility will identify the key causes and make recommendations to help secure better value for taxpayers' money. Australian jurisdictions have experienced sharp rises in the cost of delivering mega-projects. In the pre-GFC mining construction boom period of the mid-2000s construction costs were 20-30% …
Holden To Cease Making Cars In Australia By 2017: Experts React, Paul Gollan, Hamza Bendemra, Henry Ergas, Elizabeth Van Acker, Nicholas Economou, Phil Toner
Holden To Cease Making Cars In Australia By 2017: Experts React, Paul Gollan, Hamza Bendemra, Henry Ergas, Elizabeth Van Acker, Nicholas Economou, Phil Toner
Faculty of Engineering and Information Sciences - Papers: Part A
General Motors Holden has confirmed speculation it will withdraw from car production in Australia by the end of 2017. The announcement by Holden comes after days of sustained public speculation and calls from the federal government for the company to clarify its intentions. Holden has said it will "transition to a national sales company in Australia and New Zealand" and "discontinue vehicle and engine manufacturing and significantly reduce its engineering operations in Australia by the end of 2017." GM Chairman and chief executive officer Dan Akerson cited a "perfect storm of negative influences", including the sustained strength of the Australian …
Analysis Of Axisymmetric Cup Forming Of Metal Foil And Micro Hydroforming Process, Hideki Sato, Kenichi Manabe, Dongbin Wei, Zhengyi Jiang
Analysis Of Axisymmetric Cup Forming Of Metal Foil And Micro Hydroforming Process, Hideki Sato, Kenichi Manabe, Dongbin Wei, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
A novel forming method "micro hydromechanical deep drawing (MHDD)" is focused to improve the tribological property and forming limit. In this study, a theoretical model for MHDD is developed to investigate the size effect on deformation behavior in micro hydromechanical deep drawing. The effects of fluid pressure, the difference of friction coefficients at inner pockets and outer pockets are considered in the investigation on the size effect of tribological property. The friction force decreases as the scale factor decreases in MHDD process. It is also found that the tribological property in micro scale can be improved by applying the fluid …
A General Performance Model For Mac Layer Cooperative Retransmission Contention Protocols, Brett Hagelstein, Mehran Abolhasan, Daniel Franklin, Farzad Safaei
A General Performance Model For Mac Layer Cooperative Retransmission Contention Protocols, Brett Hagelstein, Mehran Abolhasan, Daniel Franklin, Farzad Safaei
Faculty of Engineering and Information Sciences - Papers: Part A
Cooperative retransmission schemes can significantly improve transmission reliability and performance over high loss and time-varying links. However, analytically comparing performance between retransmission strategies is challenging and generally requires simplistic assumptions. This paper presents a general model for the performance of distributed, slot-based contention algorithms for opportunistic decode and forward retransmission algorithms. The model is independent of specific modulation or coding schemes and may be adapted to suit state-based transmission probability models. The model is validated through QualNet simulations.