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- Faculty of Health and Behavioural Sciences - Papers (Archive) (16)
- Faculty of Engineering and Information Sciences - Papers: Part A (12)
- Faculty of Social Sciences - Papers (Archive) (12)
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Vection And Cybersickness Generated By Head-And-Display Motion In The Oculus Rift, Stephen Palmisano, Rebecca Mursic, Juno Kim
Vection And Cybersickness Generated By Head-And-Display Motion In The Oculus Rift, Stephen Palmisano, Rebecca Mursic, Juno Kim
Faculty of Social Sciences - Papers (Archive)
Cybersickness is often experienced when viewing virtual environments through head-mounted displays (HMDs). This study examined whether vection (i.e., illusory self-motion) and mismatches between perceived and physical head motions contribute to such adverse experiences. Observers made oscillatory yaw head rotations while viewing stereoscopic optic flow through an Oculus Rift HMD. Vection and cybersickness were measured under 3 conditions of visual compensation for physical head movements: "compensated", "uncompensated", and "inversely compensated". When a nearer aperture was simulated by the HMD, vection was found to be strongest in the "compensated" condition and weakest in the "inversely compensated" condition. However, vection was similar for …
Motion Optimization And Parameter Identification For A Human And Lower Back Exoskeleton Model, Paul Manns, Manish Sreenivasa, Matthew Millard, Katja Mombaur
Motion Optimization And Parameter Identification For A Human And Lower Back Exoskeleton Model, Paul Manns, Manish Sreenivasa, Matthew Millard, Katja Mombaur
Faculty of Engineering and Information Sciences - Papers: Part B
Designing an exoskeleton to reduce the risk of low-back injury during lifting is challenging. Computational models of the human-robot system coupled with predictive movement simulations can help to simplify this design process. Here, we present a study that models the interaction between a human model actuated by muscles and a lower back exoskeleton. We provide a computational framework for identifying the spring parameters of the exoskeleton using an optimal control approach and forward-dynamics simulations. This is applied to generate dynamically consistent bending and lifting movements in the sagittal plane. Our computations are able to predict motions and forces of the …
Joint Pet-Mr Respiratory Motion Models For Clinical Pet Motion Correction, Richard Manber, Kris Thielemans, Brian F. Hutton, Simon Wan, Jamie Mcclelland, Anna Barnes, Simon R. Arridge, Sebastien Ourselin, David Atkinson
Joint Pet-Mr Respiratory Motion Models For Clinical Pet Motion Correction, Richard Manber, Kris Thielemans, Brian F. Hutton, Simon Wan, Jamie Mcclelland, Anna Barnes, Simon R. Arridge, Sebastien Ourselin, David Atkinson
Faculty of Engineering and Information Sciences - Papers: Part A
Patient motion due to respiration can lead to artefacts and blurring in positron emission tomography (PET) images, in addition to quantification errors. The integration of PET with magnetic resonance (MR) imaging in PET-MR scanners provides complementary clinical information, and allows the use of high spatial resolution and high contrast MR images to monitor and correct motion-corrupted PET data. In this paper we build on previous work to form a methodology for respiratory motion correction of PET data, and show it can improve PET image quality whilst having minimal impact on clinical PET-MR protocols. We introduce a joint PET-MR motion model, …
Coupled Grain Boundary Motion In Aluminium: The Effect Of Structural Multiplicity, Kuiyu Cheng, Liang Zhang, Cheng Lu, Anh Kiet Tieu
Coupled Grain Boundary Motion In Aluminium: The Effect Of Structural Multiplicity, Kuiyu Cheng, Liang Zhang, Cheng Lu, Anh Kiet Tieu
Faculty of Engineering and Information Sciences - Papers: Part A
The shear-induced coupled grain boundary motion plays an important role in the deformation of nanocrystalline (NC) materials. It has been known that the atomic structure of the grain boundary (GB) is not necessarily unique for a given set of misorientation and inclination of the boundary plane. However, the effect of the structural multiplicity of the GB on its coupled motion has not been reported. In the present study we investigated the structural multiplicity of the symmetric tilt Σ 5(310) boundary in aluminium and its influence on the GB behaviour at a temperature range of 300 K-600 K using molecular dynamic …
Relative Visual Oscillation Can Facilitate Visually Induced Self-Motion Perception, Shinji Nakamura, Stephen Palmisano, Juno Kim
Relative Visual Oscillation Can Facilitate Visually Induced Self-Motion Perception, Shinji Nakamura, Stephen Palmisano, Juno Kim
Faculty of Social Sciences - Papers (Archive)
Adding simulated viewpoint jitter or oscillation to displays enhances visually induced illusions of self-motion (vection). The cause of this enhancement is yet to be fully understood. Here, we conducted psychophysical experiments to investigate the effects of different types of simulated oscillation on vertical vection. Observers viewed horizontally oscillating and nonoscillating optic flow fields simulating downward self-motion through an aperture. The aperture was visually simulated to be nearer to the observer and was stationary or oscillating in-phase or counter-phase to the direction of background horizontal oscillations of optic flow. Results showed that vection strength was modulated by the oscillation of the …
The Oculus Rift: A Cost-Effective Tool For Studying Visual-Vestibular Interactions In Self-Motion Perception, Juno Kim, Charles Y. Chung, Shinji Nakamura, Stephen Palmisano, Sieu Khuu
The Oculus Rift: A Cost-Effective Tool For Studying Visual-Vestibular Interactions In Self-Motion Perception, Juno Kim, Charles Y. Chung, Shinji Nakamura, Stephen Palmisano, Sieu Khuu
Faculty of Social Sciences - Papers (Archive)
For years now, virtual reality devices have been applied in the field of vision science in an attempt to improve our understanding of perceptual principles underlying the experience of self-motion. Some of this research has been concerned with exploring factors involved in the visually-induced illusory perception of self-motion, known as vection. We examined the usefulness of the cost-effective Oculus Rift in generating vection in seated observers. This device has the capacity to display optic flow in world coordinates by compensating for tracked changes in 3D head orientation. We measured vection strength in three conditions of visual compensation for head movement: …
Unfamiliar Faces Engaged In Non-Rigid Motion Are Processed Holistically, Daniel Piepers, Darren C. Burke, Simone K. Favelle, Catherine Stevens, Rachel Robbins
Unfamiliar Faces Engaged In Non-Rigid Motion Are Processed Holistically, Daniel Piepers, Darren C. Burke, Simone K. Favelle, Catherine Stevens, Rachel Robbins
Faculty of Social Sciences - Papers (Archive)
Paper presented at the Australasian Experimental Psychology Conference 2015, 8-11 April 2015, Sydney, Australia.
Motion By Mixed Volume Preserving Curvature Functions Near Spheres, David James Hartley
Motion By Mixed Volume Preserving Curvature Functions Near Spheres, David James Hartley
Senior Deputy Vice-Chancellor and Deputy Vice-Chancellor (Education) - Papers
In this paper we investigate the flow of hypersurfaces by a class of symmetric functions of the principal curvatures with a mixed volume constraint. We consider compact hypersurfaces without boundary that can be written as a graph over a sphere. The linearisation of the resulting fully nonlinear PDE is used to prove a short-time existence theorem for hypersurfaces that are sufficiently close to a sphere and, using centre manifold analysis, the stability of the sphere as a stationary solution to the flow is determined. We will find that for initial hypersurfaces sufficiently close to a sphere, the flow will exist …
Walking Without Visual Motion Reduces Subsequent Vection, Stephen Palmisano, Takeharu Seno, B Riecke, Shinji Nakamura
Walking Without Visual Motion Reduces Subsequent Vection, Stephen Palmisano, Takeharu Seno, B Riecke, Shinji Nakamura
Faculty of Social Sciences - Papers (Archive)
Paper presented at the Australasian Experimental Psychology Conference 2015, 8-11 April 2015, Sydney, Australia.
Influence Of Vertical Motion On Initiation Of Sediment Movement, Ishraq Alfadhli, Shu-Qing Yang, Muttucumaru Sivakumar
Influence Of Vertical Motion On Initiation Of Sediment Movement, Ishraq Alfadhli, Shu-Qing Yang, Muttucumaru Sivakumar
Faculty of Engineering and Information Sciences - Papers: Part A
This paper makes an attempt to answer why the observed critical Shields stress for incipient sediment motion deviates from the Shields curve. The measured dataset collected from literature show that the critical Shields stress widely deviates from the Shields diagram’s prediction. This paper has re-examined the possible mechanisms responsible for the validity of Shields’ diagram and found that, among many factors, the vertical velocity in the sediment layer plays a leading role for the invalidity of Shield’s prediction. A closer look of the positive/negative deviation reveals that they correspond to the up/downward vertical velocity, and the Shields diagram is valid …
The Pricing Of Credit Default Swaps Under A Generalized Mixed Fractional Brownian Motion, Xinjiang He, Wenting Chen
The Pricing Of Credit Default Swaps Under A Generalized Mixed Fractional Brownian Motion, Xinjiang He, Wenting Chen
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we consider the pricing of the CDS (credit default swap) under a GMFBM (generalized mixed fractional Brownian motion) model. As the name suggests, the GMFBM model is indeed a generalization of all the FBM (fractional Brownian motion) models used in the literature, and is proved to be able to effectively capture the long-range dependence of the stock returns. To develop the pricing mechanics of the CDS, we firstly derive a sufficient condition for the market modeled under the GMFBM to be arbitrage free. Then under the risk-neutral assumption, the CDS is fairly priced by investigating the two …
A New Model For The Prediction Of Earthquake Ground-Motion Duration In Iran, Saman Yaghmaei-Sabegh, Zhila Shoghian, M Neaz Sheikh
A New Model For The Prediction Of Earthquake Ground-Motion Duration In Iran, Saman Yaghmaei-Sabegh, Zhila Shoghian, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part A
The paper proposes a new empirical model to estimate earthquake ground-motion duration, which significantly influences the damage potential of an earthquake. The paper is concerned with significant duration parameters that are defined as the time intervals between which specified values of Arias intensity are reached. In the proposed model, significant duration parameters have been expressed as a function of moment magnitude, closest site-source distance, and site condition. The predictive model has been developed based on a database of earthquake ground-motion records in Iran, containing 286 records up to the year 2007, and a random-effect regression procedure. The result of the …
Time Spent On Daytime Direct Care Activities By Personal Carers In Two Australian Residential Aged Care Facilities: A Time-Motion Study, Siyu Qian, Ping Yu, David M. Hailey, Zhenyu Zhang, Pam Davy, Mark I. Nelson
Time Spent On Daytime Direct Care Activities By Personal Carers In Two Australian Residential Aged Care Facilities: A Time-Motion Study, Siyu Qian, Ping Yu, David M. Hailey, Zhenyu Zhang, Pam Davy, Mark I. Nelson
Faculty of Engineering and Information Sciences - Papers: Part A
Objective. To examine the time, frequency and duration of each direct care activity conducted by personal carers in Australian residential aged care homes. Methods. A time-motion study was conducted to observe 46 personal carers at two high-care houses in two facilities (14 days at Site 1 and 16 days at Site 2). Twenty-three direct care activities were classified into eight categories for analysis. Results. Overall, a personal carer spent approximately 45% of their time on direct care, corresponding to 3.5 h in an 8-h daytime shift. The two sites had similar ratios of personal carers to residents, and each resident …
Impaired Perception Of Facial Motion In Autism Spectrum Disorder, Justin O'Brien, Janine Spencer, Christine Girges, Alan Johnston, Harold Hill
Impaired Perception Of Facial Motion In Autism Spectrum Disorder, Justin O'Brien, Janine Spencer, Christine Girges, Alan Johnston, Harold Hill
Faculty of Social Sciences - Papers (Archive)
Facial motion is a special type of biological motion that transmits cues for socio-emotional communication and enables the discrimination of properties such as gender and identity. We used animated average faces to examine the ability of adults with autism spectrum disorders (ASD) to perceive facial motion. Participants completed increasingly difficult tasks involving the discrimination of (1) sequences of facial motion, (2) the identity of individuals based on their facial motion and (3) the gender of individuals. Stimuli were presented in both upright and upside-down orientations to test for the difference in inversion effects often found when comparing ASD with controls …
Chaos In Balance: Non-Linear Measures Of Postural Control Predict Individual Variations In Visual Illusions Of Motion, Deborah Apthorp, Fintan Nagle, Stephen Palmisano
Chaos In Balance: Non-Linear Measures Of Postural Control Predict Individual Variations In Visual Illusions Of Motion, Deborah Apthorp, Fintan Nagle, Stephen Palmisano
Faculty of Social Sciences - Papers (Archive)
Visually-induced illusions of self-motion (vection) can be compelling for some people, but they are subject to large individual variations in strength. Do these variations depend, at least in part, on the extent to which people rely on vision to maintain their postural stability? We investigated by comparing physical posture measures to subjective vection ratings. Using a Bertec balance plate in a brightly-lit room, we measured 13 participants' excursions of the centre of foot pressure (CoP) over a 60-second period with eyes open and with eyes closed during quiet stance. Subsequently, we collected vection strength ratings for large optic flow displays …
A Convexity Bias In The Processing Of Motion Parallax Transformations, B Rogers, Harold Hill
A Convexity Bias In The Processing Of Motion Parallax Transformations, B Rogers, Harold Hill
Faculty of Social Sciences - Papers (Archive)
Abstract presented at the Applied Vision Association Christmas Meeting, Leuven, Belgium 19-20 December 2013
Vection Induced By Illusory Motion In A Stationary Image, Takeharu Seno, Akiyoshi Kitaoka, Stephen Palmisano
Vection Induced By Illusory Motion In A Stationary Image, Takeharu Seno, Akiyoshi Kitaoka, Stephen Palmisano
Faculty of Social Sciences - Papers (Archive)
Ilusory self-motion (vection) can be induced by large areas of visual motion stimulation. Here we demonstrate for the first time that illusory expansion can induce vection in the absence of any physical display motion.
Displacement Profile Estimation Using Low Cost Inertial Motion Sensors With Applications To Sporting And Rehabilitation Exercises, James Coyte, David A. Stirling, Montserrat Ros, Haiping Du, Andrew Gray
Displacement Profile Estimation Using Low Cost Inertial Motion Sensors With Applications To Sporting And Rehabilitation Exercises, James Coyte, David A. Stirling, Montserrat Ros, Haiping Du, Andrew Gray
Faculty of Engineering and Information Sciences - Papers: Part A
This paper investigates two methods of displacement estimation using sampled acceleration and orientation data from a 6 degrees of freedom (DOF) Inertial Measurement Unit (IMU), with the application to sporting training and rehabilitation. Currently, the use of low cost IMUs for this particular application is very impractical due to the accumulation of errors from various sources. Previous studies and projects that have applied IMUs to similar applications have used a lower number of DOF, or have used higher accuracy navigational grade IMUs. Solutions to the acceleration noise accumulation and gyroscope angle error problem are proposed in this paper. A zero …
Motion By Volume Preserving Mean Curvature Flow Near Cylinders, David James Hartley
Motion By Volume Preserving Mean Curvature Flow Near Cylinders, David James Hartley
Senior Deputy Vice-Chancellor and Deputy Vice-Chancellor (Education) - Papers
We investigate the volume preserving mean curvature flow with Neumann boundary condition for hypersurfaces that are graphs over a cylinder. Through a center manifold analysis we find that initial hypersurfaces sufficiently close to a cylinder of large enough radius, have a flow that exists for all time and converges exponentially fast to a cylinder. In particular, we show that there exist global solutions to the flow that converge to a cylinder, which are initially non-axially symmetric. A similar case where the initial hypersurfaces are spherical graphs has previously been investigated by Escher and Simonett [8].
Dynamic Fingerprint Based On Human Motion And Posture, Amir Hesami, Fazel Naghdy, David Stirling
Dynamic Fingerprint Based On Human Motion And Posture, Amir Hesami, Fazel Naghdy, David Stirling
Faculty of Engineering and Information Sciences - Papers: Part A
The feasibility of generating a Dynamic FingerPrint (DFP) for an individual is explored. DFP is a unique signature generated based on a combination of body part movements. The body movements are obtained using a sensor suit recording inertial signals that are subsequently modeled on a humanoid frame with 23 degrees of freedom (DOF). Measured signals include position, velocity, acceleration, orientation, angular velocity and angular acceleration. DTW (Dynamic Time Warping) is XVHG WR FODVVLI\ WKH LQGLYLGXDO¶V identity. The approach is described and the characteristics of the algorithms are presented. It is anticipated that these approaches will have applications in surveillance and …
Vection During Conflicting Multisensory Information About The Axis, Magnitude And Direction Of Self-Motion, April Ash, Stephen Palmisano
Vection During Conflicting Multisensory Information About The Axis, Magnitude And Direction Of Self-Motion, April Ash, Stephen Palmisano
Faculty of Health and Behavioural Sciences - Papers (Archive)
We examined the vection induced by consistent and conflicting multisensory information about self-motion. Observers viewed displays simulating constant-velocity self-motion in depth while physically oscillating their heads left ^ right or back ^ forth in time with a metronome. Their tracked head movements were either ignored or incorporated directly into the self-motion display (as an added simulated self-acceleration). When this head oscillation was updated into displays, sensory conflict was generated by simulating oscillation along: (i) an orthogonal axis to the head movement; or (ii) the same axis, but in a non-ecological direction. Simulated head oscillation always produced stronger vection than `no …
Directionless Vection: A New Illusory Self-Motion Perception, Takeharu Seno, Y Yamada, Stephen A. Palmisano
Directionless Vection: A New Illusory Self-Motion Perception, Takeharu Seno, Y Yamada, Stephen A. Palmisano
Faculty of Health and Behavioural Sciences - Papers (Archive)
We report a new visual illusion, "directionless vection." When expanding and contracting optic flows are simultaneously presented in the same depth plane, observers can perceive illusory self-motion (vection) without direction
Perception Of Mooney Faces By Young Infants: The Role Of Local Feature Visibility, Contrast Polarity And Motion, Yumiko Otsuka, Harold C. H Hill, So Kanazawa, Masami K. Yamaguchi, Branka Spehar
Perception Of Mooney Faces By Young Infants: The Role Of Local Feature Visibility, Contrast Polarity And Motion, Yumiko Otsuka, Harold C. H Hill, So Kanazawa, Masami K. Yamaguchi, Branka Spehar
Faculty of Health and Behavioural Sciences - Papers (Archive)
We examined the ability of young infants (3- and 4-month-olds) to detect faces in the two-tone images often referred to as Mooney faces. In Experiment 1, this performance was examined in conditions of high and low visibility of local features and with either the presence or absence of the outer head contour. We found that regardless of the presence of the outer head contour, infants preferred upright over inverted two-tone face images only when local features were highly visible (Experiment 1a). We showed that this upright preference disappeared when the contrast polarity of twotone images was reversed (Experiment 1b), reflecting …
Vection Can Be Induced Without Global-Motion Awareness, Takeharu Seno, Stephen A. Palmisano, Hiroyuki Ito, Shoji Sunaga
Vection Can Be Induced Without Global-Motion Awareness, Takeharu Seno, Stephen A. Palmisano, Hiroyuki Ito, Shoji Sunaga
Faculty of Health and Behavioural Sciences - Papers (Archive)
A new vection illusion is reported. Vection was induced even though there was no consciously perceived global display motion corresponding to the self-motion. The resulting experience can be summarised as: ``I feel that I am moving but I do not know why''.
An Indoor Localisation And Motion Monitoring System To Determine Behavioural Activity In Dementia Afflicted Patients In Aged Care, Matthew D'Souza, Montserrat Ros, Mohanraj Karunanithi
An Indoor Localisation And Motion Monitoring System To Determine Behavioural Activity In Dementia Afflicted Patients In Aged Care, Matthew D'Souza, Montserrat Ros, Mohanraj Karunanithi
Faculty of Health and Behavioural Sciences - Papers (Archive)
Dementia is highly prevalent among the older population. Most patients with dementia are admitted to an aged care facility due to wandering behaviour which tends to result in dangerous scenarios such as straying away from the facility and being seriously injured. Due to the decreasing availability of carers in aged care, there is a need to prioritise monitoring of patients that have a severe case of wondering. The challenge is to allow carers to monitor the status of such patients in terms of position localisation and motion behavioural status, in real-time. The long term behavioural analysis of such patients would …
The Role Of Motion In Recognising Facial Expressions., Simone K. Favelle, A Tobin, M Demayo, R Palermo
The Role Of Motion In Recognising Facial Expressions., Simone K. Favelle, A Tobin, M Demayo, R Palermo
Faculty of Social Sciences - Papers (Archive)
Poster presented at the 39th Australasian Experimental Psychology Conference, University of New South Wales, 12-15 April 2012
The Work Pattern Of Care Workers In Residential Aged Care Facilities In Australia: A Time And Motion Study, Siyu Qian, Ping Yu, Zhenyu Zhang
The Work Pattern Of Care Workers In Residential Aged Care Facilities In Australia: A Time And Motion Study, Siyu Qian, Ping Yu, Zhenyu Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
Abstract of paper presented at the 2011 Health Informatics Conference, Brisbane Australia.
Temporal Integration Of Movement: Fhe Time-Course Of Motion Streaks Revealed By Masking, David Alais, Deborah M. Apthorp, Aana Karmann, John Cass
Temporal Integration Of Movement: Fhe Time-Course Of Motion Streaks Revealed By Masking, David Alais, Deborah M. Apthorp, Aana Karmann, John Cass
Faculty of Health and Behavioural Sciences - Papers (Archive)
Temporal integration in the visual system causes fast-moving objects to leave oriented 'motion streaks' in their wake, which could be used to facilitate motion direction perception. Temporal integration is thought to occur over 100 ms in early cortex, although this has never been tested for motion streaks. Here we compare the ability of fast-moving ('streaky') and slow-moving fields of dots to mask briefly flashed gratings either parallel or orthogonal to the motion trajectory. Gratings were presented at various asynchronies relative to motion onset (from to ms) to sample the time-course of the accumulating streaks. Predictions were that masking would be …
Unmanned Aerial Vehicle (Uav) Remote Sensing For Hyperspatial Terrain Mapping Of Antarctic Moss Beds Based On Structure From Motion (Sfm) Point Clouds, A Lucieer, Sharon A. Robinson, D Turner
Unmanned Aerial Vehicle (Uav) Remote Sensing For Hyperspatial Terrain Mapping Of Antarctic Moss Beds Based On Structure From Motion (Sfm) Point Clouds, A Lucieer, Sharon A. Robinson, D Turner
Faculty of Science - Papers (Archive)
This study is the first to use an Unmanned Aerial Vehicle (UAV) for mapping moss beds in Antarctica. Mosses can be used as indicators for the regional effects of climate change. Mapping and monitoring their extent and health is therefore important. UAV aerial photography provides ultra-high resolution spatial data for this purpose. The aim of this study is to use Structure from Motion (SfM) techniques to generate a detailed 3D point cloud of the terrain from overlapping UAV photography.
Archive Fever In A Typingspace: Physicality, Digital Storage, And The Online Presence Of Derek Motion, Sally Evans
Archive Fever In A Typingspace: Physicality, Digital Storage, And The Online Presence Of Derek Motion, Sally Evans
Faculty of Creative Arts - Papers (Archive)
This paper analyses the divergences between Derrida's notion of the archive and hypermedia theory as it emerges in the late twentieth century through the writings of George P. Landow. The online presence of Australian poet Derek Motion is examined in order to demonstrate the distinction between the physicalised archive and the virtual electronic space of hypertexts, and to explicate some of the issues of legitimacy that exist around electronic texts.