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Author = Ward, Tomas E.;
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Displaying Results 1 - 25 of 170 on page 1 of 7
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A 12-Channel, real-time near-infrared spectroscopy instrument for brain-computer interface applications
(2008)
Soraghan , C.; Matthews, F.; Markham, Charles; Pearlmutter, Barak A.; O'Neill, R.;...
A 12-Channel, real-time near-infrared spectroscopy instrument for brain-computer interface applications
(2008)
Soraghan , C.; Matthews, F.; Markham, Charles; Pearlmutter, Barak A.; O'Neill, R.; Ward, Tomas E.
Abstract:
A continuous wave near-infrared spectroscopy (NIRS) instrument for brain-computer interface (BCI) applications is presented. In the literature, experiments have been carried out on subjects with such motor degenerative diseases as amyotrophic lateral sclerosis, which have demonstrated the suitability of NIRS to access intentional functional activity, which could be used in a BCI as a communication aid. Specifically, a real-time, multiple channel NIRS tool is needed to realise access to even a few different mental states, for reasonable baud rates. The 12-channel instrument described here has a spatial resolution of 30mm, employing a flexible software demodulation scheme. Temporal resolution of ~100ms is maintained since typical topographic imaging is not needed, since we are only interested in exploiting the vascular response for BCI control. A simple experiment demonstrates the ability of the system to report on haemodynamics during single trial mental arithmetic tasks. Multiple tr...
http://mural.maynoothuniversity.ie/1441/
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A CMOS Camera-Based Pulse Oximetry Imaging System
(2005)
Humphries, K.; Ward, Tomas E.; Markham, Charles
A CMOS Camera-Based Pulse Oximetry Imaging System
(2005)
Humphries, K.; Ward, Tomas E.; Markham, Charles
Abstract:
In this paper a CMOS camera-based system for non-contact pulse oximetry imaging in transmission mode is described. Attention is drawn to the current uses of conventional pulse oximetry and the potential application of pulse oximetry imaging to developing objective wound assessment systems
http://mural.maynoothuniversity.ie/1301/
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A CMOS camera-based system for clinical photoplethysmographic applications
(2005)
Humphreys, Kenneth; Markham, Charles; Ward, Tomas E.
A CMOS camera-based system for clinical photoplethysmographic applications
(2005)
Humphreys, Kenneth; Markham, Charles; Ward, Tomas E.
Abstract:
In this work an-image based photoplethysmography (PPG) system is developed and tested against a conventional fingerbased system as commonly used in clinical practise. A PPG is essentially an optical instrument consisting of a near infrared (NIR) source and detector that is capable of tracking blood flow changes in body tissue. When used with a number of wavelengths in the NIR band blood oxygenation changes as well as other blood chemical signatures can be ascertained yielding a very useful device in the clinical realm. Conventionally such a device requires direct contact with the tissue under investigation which eliminates the possibility of its use for applications like wound management where the tissue oxygenation measurement could be extremely useful. To circumnavigate this shortcoming we have developed a CMOS camera-based system, which can successfully extract the PPG signal without contact with the tissue under investigation. A comparison of our results with conventional techni...
http://mural.maynoothuniversity.ie/1368/
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A CMOS camera-based system for non-contact pulse oximetry imaging
(2006)
Humphreys, K.; Gradziel, Marcin; Markham, Charles; Ward, Tomas E.
A CMOS camera-based system for non-contact pulse oximetry imaging
(2006)
Humphreys, K.; Gradziel, Marcin; Markham, Charles; Ward, Tomas E.
Abstract:
In this paper a non-contact pulse oximetry imaging system is described. The system utilises a CMOS digital camera and near infrared (NIR) light emitting diodes operating in a reflection mode to simultaneously capture photoplethysmograph (PPG) signals at two wavelengths. The Modified Beer-Lambert Law is used to extrapolate tissue oxygenation from the PPG signals. Attention is drawn to the system’s potential in applications such as the assessment and management of wounds.
http://mural.maynoothuniversity.ie/1271/
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A Comparative Study in the Use of Brachial Photoplethysmography and the QRS Complex as Timing References in Determination of Pulse Transit Time
(2001)
Maguire, M.; Ward, Tomas E.; Markham, Charles; O'Shea, D.; Kevin, L.
A Comparative Study in the Use of Brachial Photoplethysmography and the QRS Complex as Timing References in Determination of Pulse Transit Time
(2001)
Maguire, M.; Ward, Tomas E.; Markham, Charles; O'Shea, D.; Kevin, L.
Abstract:
For more than a century, there has been interest in pulse wave velocity and pulse transit time as a possible metric for blood pressure and other cardiovascular parameters. The most common approach in noninvash:e measurement of these metries has been to measure the time delay between the QRS complex on the electrocardiograph and the detection of the finger photoplethysmograph. This paper introduces a new technique for measuring the brachial photoplethysmograph and argues that this forms a better timing reference than the QRS complex.
http://mural.maynoothuniversity.ie/1363/
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A Concept for Extending the Applicability of Constraint-Induced Movement Therapy through Motor Cortex Activity Feedback Using a Neural Prosthesis
(2007)
Ward, Tomas E.; Soraghan, Christopher John; Matthews, Fiachra; Markham, Charles
A Concept for Extending the Applicability of Constraint-Induced Movement Therapy through Motor Cortex Activity Feedback Using a Neural Prosthesis
(2007)
Ward, Tomas E.; Soraghan, Christopher John; Matthews, Fiachra; Markham, Charles
Abstract:
This paper describes a concept for the extension of constraint-induced movement therapy (CIMT) through the use of feedback of primary motor cortex activity. CIMT requires residual movement to act as a source of feedback to the patient, thus preventing its application to those with no perceptible movement. It is proposed in this paper that it is possible to provide feedback of the motor cortex effort to the patient bymeasurement with near infrared spectroscopy (NIRS). Significant changes in such effortmay be used to drive rehabilitative robotic actuators, for example. This may provide a possible avenue for extending CIMT to patients hitherto excluded as a result of severity of condition. In support of such a paradigm, this paper details the current status of CIMT and related attempts to extend rehabilitation therapy through the application of technology. An introduction to the relevant haemodynamics is given including a description of the basic technology behind a suitable NIRS syste...
http://mural.maynoothuniversity.ie/1266/
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A Consistency Regulation Algorithm for Client-Server-based Multiplayer Computer Games
(2012)
McLoone, Seamus; Wynne, Damien; McCoy, Aaron; Ward, Tomas E.
A Consistency Regulation Algorithm for Client-Server-based Multiplayer Computer Games
(2012)
McLoone, Seamus; Wynne, Damien; McCoy, Aaron; Ward, Tomas E.
Abstract:
Consistency is one of the most important aspects to be considered when designing a Distributed Interactive Application, and particularly in networked Multiplayer Computer Games (MCGs). Several techniques exist which aim to reduce network traffic in an attempt to maintain an acceptable level of consistency. However, these techniques are static in nature, as they do not adapt to the varying network conditions. This paper presents an algorithm which aims to maintain an acceptable level of consistency by adapting to changes in the network. The algorithm is a rate-based approach which monitors the remote inconsistency of all players participating in a client-server-based MCG. It operates on the premise that as the network conditions across the links between the server and the clients vary, so too will the remote inconsistency. In response, the rate at which the updates are transmitted from the server to all the remote clients is adapted, ensuring that an acceptable level of consistency i...
http://mural.maynoothuniversity.ie/4159/
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A Dual-Channel Optical Brain-Computer Interface In A Gaming Environment
(2006)
Soraghan, Christopher John; Matthews, Fiachra; Kelly, Dan; Ward, Tomas E.; Markham, Cha...
A Dual-Channel Optical Brain-Computer Interface In A Gaming Environment
(2006)
Soraghan, Christopher John; Matthews, Fiachra; Kelly, Dan; Ward, Tomas E.; Markham, Charles; Pearlmutter, Barak A.; O'Neill, Ray
Abstract:
This paper explores the viability of using a novel optical Brain-Computer Interface within a gaming environment. We describe a system that incorporates a 3D gaming engine and an optical BCI. This made it possible to classify activation in the motor cortex within a synchronous experimental paradigm. Detected activations were used to control the arm movement of a human model in the graphical engine.
http://mural.maynoothuniversity.ie/1293/
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A Java Tool for Exploring State Estimation using the Kalman Filter
(2004)
Delaney, Declan; Ward, Tomas E.
A Java Tool for Exploring State Estimation using the Kalman Filter
(2004)
Delaney, Declan; Ward, Tomas E.
Abstract:
This paper describes a novel software application that assists in understanding the process of estimating the state of a linear dynamic system based on noisy output signal measurements. An interactive Java tool, based on the Kalman Filter, is described. This consists of two main parts, a simple one-dimensional filter and a multi-dimensional filter tool. The user can set all input parameters through a single interface or by following a series of guided steps. Raw measurement data can be generated automatically or inserted manually by the user and the results of estimating the true system state are then presented as a series of graphs in real-time. The application is described through the use of two simple examples. Such an application could be used to teach signal and systems engineering.
http://mural.maynoothuniversity.ie/201/
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A machine learning approach towards detecting dementia based on its modifiable risk factors
(2019)
Bin-Hezam, Reem; Ward, Tomás E.
A machine learning approach towards detecting dementia based on its modifiable risk factors
(2019)
Bin-Hezam, Reem; Ward, Tomás E.
Abstract:
Dementia is considered one of the greatest global health and social care challenges in the 21st century. Fortunately, dementia can be delayed or possibly prevented by changes in lifestyle as dictated through known modifiable risk factors. These risk factors include low education, hypertension, obesity, hearing loss, depression, diabetes, physical inactivity, smoking, and social isolation. Other risk factors are non- modifiable and include aging and genetics. The main goal of this study is to demonstrate how machine learning methods can help predict dementia based on an individual’s modifiable risk factors profile. We use publicly available datasets for training algorithms to predict participant’ s cognitive state diagnosis, as cognitive normal or mild cognitive impairment or dementia. Several approaches were implemented using data from the Alzheimer’s Disease Neuroimaging Initiative (ADNI) longitudinal study. The best classification results were obtained using both the Lancet and th...
http://doras.dcu.ie/23650/
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A machine vision approach to human activity recognition using photoplethysmograph sensor data
(2018)
Brophy, Eoin; Wang, Zhengwei; Dominguez Veiga, José Juan; Ward, Tomás E.
A machine vision approach to human activity recognition using photoplethysmograph sensor data
(2018)
Brophy, Eoin; Wang, Zhengwei; Dominguez Veiga, José Juan; Ward, Tomás E.
Abstract:
Human activity recognition (HAR) is an active area of research concerned with the classification of human motion. Cameras are the gold standard used in this area, but they are proven to have scalability and privacy issues. HAR studies have also been conducted with wearable devices consisting of inertial sensors. Perhaps the most common wearable, smart watches, comprising of inertial and optical sensors, allow for scalable, non-obtrusive studies. We are seeking to simplify this wearable approach further by determining if wrist-mounted optical sensing, usually used for heart rate determination, can also provide useful data for relevant activity recognition. If successful, this could eliminate the need for the inertial sensor, and so simplify the technological requirements in wearable HAR. We adopt a machine vision approach for activity recognition based on plots of the optical signals so as to produce classifications that are easily explainable and interpretable by non-technical users...
http://doras.dcu.ie/22433/
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A Mechanical Mounting System for Functional Near-Infrared Spectroscopy Brain Imaging Studies
(2005)
Coyle, Shirley; Markham, Charles; Lanigan, William; Ward, Tomas E.
A Mechanical Mounting System for Functional Near-Infrared Spectroscopy Brain Imaging Studies
(2005)
Coyle, Shirley; Markham, Charles; Lanigan, William; Ward, Tomas E.
Abstract:
In this work a mechanical optode mounting system for functional brain imaging with light is presented. The particular application here is a non-invasive optical brain computer interface (BCI) working in the near-infrared range. A BCI is a device that allows a user to interact with their environment through thought processes alone. Their most common use is as a communication aid for the severely disabled. We have recently pioneered the use of optical techniques for such BCI systems rather than the usual electrical modality [1]. Our optical BCI detects characteristic changes in the cerebral haemodynamic responses that occur during motor imagery tasks. On detection of features of the optical response, resulting from localised haemodynamic changes, the BCI translates such responses and provides visual feedback to the user. While signal processing has a large part to play in terms of optimising performance we have found that it is the mechanical mounting of the optical sources and detect...
http://mural.maynoothuniversity.ie/1367/
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A Methodology for Validating Artifact Removal Techniques for Physiological Signals
(2012)
Sweeney, Kevin; Ayaz, Hasan; Ward, Tomas E.; Izzetoglu, Meltem; McLoone, Sean F.; Onara...
A Methodology for Validating Artifact Removal Techniques for Physiological Signals
(2012)
Sweeney, Kevin; Ayaz, Hasan; Ward, Tomas E.; Izzetoglu, Meltem; McLoone, Sean F.; Onaral, Banu
Abstract:
Artifact removal from physiological signals is an essential component of the biosignal processing pipeline. The need for powerful and robust methods for this process has become particularly acute as healthcare technology deployment undergoes transition from the current hospital-centric setting toward a wearable and ubiquitous monitoring environment. Currently, determining the relative efficacy and performance of the multiple artifact removal techniques available on real world data can be problematic, due to incomplete information on the uncorrupted desired signal. The majority of techniques are presently evaluated using simulated data, and therefore, the quality of the conclusions is contingent on the fidelity of the model used. Consequently, in the biomedical signal processing community, there is considerable focus on the generation and validation of appropriate signal models for use in artifact suppression. Most approaches rely on mathematical models which capture suitable approxi...
http://mural.maynoothuniversity.ie/4161/
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A methodology for validating artifact removal techniques for fNIRS
(2011)
Sweeney, Kevin; Ayaz, Hasan; Ward, Tomas E.; Izzetoglu, Meltem; McLoone, Sean F.; Onara...
A methodology for validating artifact removal techniques for fNIRS
(2011)
Sweeney, Kevin; Ayaz, Hasan; Ward, Tomas E.; Izzetoglu, Meltem; McLoone, Sean F.; Onaral, Banu
Abstract:
fNIRS recordings are increasingly utilized to monitor brain activity in both clinical and connected health settings. These optical recordings provide a convenient measurement of cerebral hemodynamic changes which can be linked to motor and cognitive performance. Such measurements are of clinical utility in a broad range of conditions ranging from dementia to movement rehabilitation therapy. For such applications fNIRS is increasingly deployed outside the clinic for patient monitoring in the home. However, such a measurement environment is poorly controlled and motion, in particular, is a major source of artifacts in the signal, leading to poor signal quality for subsequent clinical interpretation. Artifact removal techniques are increasingly being employed with an aim of reducing the effect of the noise in the desired signal. Currently no methodology is available to accurately determine the efficacy of a given artifact removal technique due to the lack of a true reference for the un...
http://mural.maynoothuniversity.ie/3644/
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A Model of the Hoffmann Reflex
(2000)
Ward, Tomas E.
A Model of the Hoffmann Reflex
(2000)
Ward, Tomas E.
Abstract:
The Hoffman reflex which has applications in assessment of nervous system damage in stroke, spinal injury, Parkinson's disease and other conditions is studied here both practically and theoretically. Using recorded Hoffman reflex data a model is proposed that captures the qualitative behaviour of the phenomenon and allows investigation of how different waveform morphologies and patterns of recruitment can be related to underlying physiological variables.
http://mural.maynoothuniversity.ie/1314/
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A Model of the Median Sensory Nerve Compound Action Potential leading to a Method for Nerve Fibre Diameter Distribution
(1999)
Ward, Tomas E.
A Model of the Median Sensory Nerve Compound Action Potential leading to a Method for Nerve Fibre Diameter Distribution
(1999)
Ward, Tomas E.
Abstract:
Nerve conduction studies (NCS) are one of the basic tools of the electrodiagnostic clinician and are performed in order to evaluate the integrity of peripheral nerve function . Using such techniques diagnosis of various diseases and disorders of nerve are possible. During NCS a peripheral nerve is stimulated using an electrical pulse of sufficient intensity to recruit as many nerve fibres as possible. This elicits a volley of action potentials (APs) in the individual nerve fibres which is then recorded at a distal point usually using surface electrodes. Usually only two components of the recorded response (called the compound action potential or CAP), the distal amplitude and the distal/peak latency are routinely recorded though the proximal latency is also used to construct an average measure of conduction velocity (CV). In this study a model of the sensory CAP of the median nerve as measured using bipolar electrodes is proposed and using this model an additional measure is extract...
http://mural.maynoothuniversity.ie/1434/
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A novel co-locational and concurrent fNIRS/EEG measurement system: design and initial results.
(2010)
Leamy, Darren J.; Ward, Tomas E.
A novel co-locational and concurrent fNIRS/EEG measurement system: design and initial results.
(2010)
Leamy, Darren J.; Ward, Tomas E.
Abstract:
We describe here the design, set-up and first time classification results of a novel co-locational functional Near- Infrared Spectroscopy/Electroencephalography (fNIRS/EEG) recording device suitable for brain computer interfacing applications using neural-hemodynamic signals. Our dual-modality system recorded both hemodynamic and electrical activity at seven sites over the motor cortex during an overt finger-tapping task. Data was collected from two subjects and classified offline using Linear Discriminant Analysis (LDA) and Leave-One-Out Cross-Validation (LOOCV). Classification of fNIRS features, EEG features and a combination of fNIRS/EEG features were performed separately. Results illustrate that classification of the combined fNIRS/EEG feature space offered average improved performance over classification of either feature space alone. The complementary nature of the physiological origin of the dual measurements offer a unique and information rich signal for a small measurement ...
http://mural.maynoothuniversity.ie/4162/
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A Novel Convergence Algorithm for the Hybrid Strategy Model Packet Reduction Technique
(2005)
Delaney, Declan; McLoone, Seamus; Ward, Tomas E.
A Novel Convergence Algorithm for the Hybrid Strategy Model Packet Reduction Technique
(2005)
Delaney, Declan; McLoone, Seamus; Ward, Tomas E.
Abstract:
Several approaches exist for maintaining consistency in Distributed Interactive Applications. Among these are techniques such as dead reckoning which use prediction algorithms to approximate actual user behaviour and thus reduce the number of update packets required to maintain spatial consistency. The Hybrid Strategy Model operates in a similar way, exploiting long-term patterns in user behaviour whenever possible. Otherwise it simply adopts a short-term model. A major problem with these techniques is the reconstruction of the local behaviour at a remote node. Using the modelled dynamics directly can result in unnatural and sudden jumps in position where updates occur. Convergence algorithms are thus required to smoothly reconstruct remote behaviour from discontinuous samples of the actual local behaviour. This paper makes two important contributions. Primarily, it proposes a novel convergence approach for the Hybrid Strategy Model. Secondly, and more fundamentally, it exposes a la...
http://mural.maynoothuniversity.ie/279/
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A Physics-Aware Dead Reckoning Technique for Entity State Updates in Distributed Interactive Applications
(2012)
Walsh, Patrick J.; Ward, Tomas E.; McLoone, Seamus
A Physics-Aware Dead Reckoning Technique for Entity State Updates in Distributed Interactive Applications
(2012)
Walsh, Patrick J.; Ward, Tomas E.; McLoone, Seamus
Abstract:
This paper proposes a novel entity state update technique for physics-rich environments in peer-to-peer Distributed Interactive Applications. The proposed technique consists of a dynamic authority scheme for shared objects and a physics-aware dead reckoning model with an adaptive error threshold. The former is employed to place a bound on the overall inconsistency present in shared objects, while the latter is implemented to minimise the instantaneous inconsistency during users’ interactions with shared objects. The performance of the proposed entity state update mechanism is validated using a simulated application.
http://mural.maynoothuniversity.ie/4164/
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A Preliminary Investigation into Eye Gaze Data in a First Person Shooter Game
(2005)
Kenny, A; Koesling, H; Delaney, Declan; McLoone, Seamus; Ward, Tomas E.
A Preliminary Investigation into Eye Gaze Data in a First Person Shooter Game
(2005)
Kenny, A; Koesling, H; Delaney, Declan; McLoone, Seamus; Ward, Tomas E.
Abstract:
This paper describes a study carried out in which the eye gaze data of several users playing a simple First Person Shooter (FPS) game has been recorded. This work shows the design and implementation of a simple game and how the execution of the game can be synchronized with an eye tracking system. The motivation behind this work is to determine the existence of visual psycho-perceptual phenomena, which may be of some use in developing appropriate information limits for distributed interactie media compression algorithms. Only 2 degrees of the 140 degrees of human vision has a high level of detail. It may be possible to determine the areas of the screen that a user is focusing on and render it in high details or pay perticular attention to its contents so as to set appropriate dead reckoning limits. Our experiment show that eye tracking may allow for improvements in rendering and new compression algorithms to be created for an online FPS game.
http://mural.maynoothuniversity.ie/282/
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A Preliminary Investigation into the use of Machine Vision Techniques for Automating Facial Paralysis Rehabilitation Therapy
(2010)
Reilly Delannoy, Jane; Ward, Tomas E.
A Preliminary Investigation into the use of Machine Vision Techniques for Automating Facial Paralysis Rehabilitation Therapy
(2010)
Reilly Delannoy, Jane; Ward, Tomas E.
Abstract:
An impaired facial motor system is a common deficit associated with injury to the nervous system such as occurs during stroke or head trauma. Despite the impact Facial Motor System (FMS) damage has on psychological and social aspects of an individual’s quality of life, facial motor rehabilitation has received little attention until comparatively recently. In this paper preliminary results of our investigation into the use of machine vision methods for the development of an automatic feedback system are presented. We show by way of experimental results that our system provides initial steps towards the development of a system for enhancing the rehabilitation prospects of individuals suffering from FMS damage. The proposed system will act as an intelligent mirror, providing basic feedback by tracking key facial features during the attempted gesture. Such a system could potentially emulate the therapist, automatically assessing the patient according to standard facial disability measur...
http://mural.maynoothuniversity.ie/4165/
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A Prototype Sourceless Kinematic-Feedback Based Video Game for Movement Based Exercise
(2006)
Foody, J.; Kelly, D.; Kumar, D.; Fitzgerald, D.; Ward, Tomas E.; Caulfield, B.; Markham...
A Prototype Sourceless Kinematic-Feedback Based Video Game for Movement Based Exercise
(2006)
Foody, J.; Kelly, D.; Kumar, D.; Fitzgerald, D.; Ward, Tomas E.; Caulfield, B.; Markham, Charles
Abstract:
This paper presents a prototype kinematic and audio feedback based video game, availing of a scalable motion capture acquisition system, based around a number of orientation sensors. The orientation sensors used are USB based tri-axis magnetic and gravitational field transducers. The novel video-game is capable of incorporating the real time data from these sensors to control an on screen avatar, which in turn can be programmed to give appropriate instructions to the user i.e. play a sound file, once the user obtains a certain posture. The video game is designed to promote physical exercise and movement based relaxation, in particular; Yoga. In addition, design considerations; implementation and performance of the system are analyzed, discussed and the accuracy qualitatively analyzed by comparing movement data obtained from it to that of a validated motion analysis technique, the CODA motion analysis system.
http://mural.maynoothuniversity.ie/1352/
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A Psycho-Perceptual Comparison of the Dead Reckoning and the Hybrid Strategy Model Entity State Update Prediction Techniques
(2006)
McLoone, Seamus; Kenny, Alan; Ward, Tomas E.; Delaney, Declan
A Psycho-Perceptual Comparison of the Dead Reckoning and the Hybrid Strategy Model Entity State Update Prediction Techniques
(2006)
McLoone, Seamus; Kenny, Alan; Ward, Tomas E.; Delaney, Declan
Abstract:
Distributed Interactive Applications (DIAs) typically employ entity prediction mechanisms in order to reduce the number of packets sent between clients across the network. This in turn counters the effect of network latency and can improve the consistency of the distributed application. Dead Reckoning (DR) is currently the most commonly used entity state prediction mechanism but a more recent technique called the Hybrid Strategy Model (HSM) has been proposed in the research literature. This alternative method has been shown to further reduce the number of update packets required to maintain a consistent state in a DIA. However, there is a distinct lack of end-user perceptual analysis of these techniques. In other words, does the HSM method improve the gaming experience of the user compared to DR? A reduction in packet count may improve issues with latency but can adversely degrade the modelling quality and therefore the overall level of consistency is unknown. Hence, this paper prop...
http://mural.maynoothuniversity.ie/1281/
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A Real Time Motion Capture System, Using USB Based Tri-Axis Magnetic and Inertial Sensors for Movement Based Relaxation
(2006)
Foody, J.; Kelly, D.; Kumar, D.; Fitzgerald, D.; Ward, Tomas E.; Caulfield, B.; Markham...
A Real Time Motion Capture System, Using USB Based Tri-Axis Magnetic and Inertial Sensors for Movement Based Relaxation
(2006)
Foody, J.; Kelly, D.; Kumar, D.; Fitzgerald, D.; Ward, Tomas E.; Caulfield, B.; Markham, Charles
Abstract:
scalable motion capture system based on multiple orientation sensors, each consisting of tri-axis magnetic and gravitational field transducers, for use in kinematic studies; is presented. Outlined is a novel system capable of accessing real time data from multiple sensors, via one universal serial bus host, using a dynamic link library. In addition, design considerations; implementation and performance of the system are analysed and discussed.
http://mural.maynoothuniversity.ie/1561/
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A Realistic Distributed Interactive Application Testbed for Static and Dynamic Entity State Data Acquisition
(2004)
Marshall, Damien; McCoy, Aaron; Delaney, Declan; McLoone, Seamus; Ward, Tomas E.
A Realistic Distributed Interactive Application Testbed for Static and Dynamic Entity State Data Acquisition
(2004)
Marshall, Damien; McCoy, Aaron; Delaney, Declan; McLoone, Seamus; Ward, Tomas E.
Abstract:
Scalability is an important issue for Distributed Interactive Application (DIA) designers. In order to achieve this, it is important to minimise the network traffic required to maintain the DIA. A commonly used technique to reduce network traffic is through short-term entity dynamics extrapolation. However, this technique makes no use of a priori information regarding entity dynamics. We have been developing methods to employ this information through a number of techniques, primarily statistical in nature, which have shown great promise in constrained experimental environments. The main tenet of our approach is that user behaviour in real DIAs follows patterns, and through acquisition, analysis and exploitation of these patterns, a reduction in network traffic can be achieved. In this paper, we report on our development of a realistic DIA based on an industry standard SDK in which we have implemented data acquisition routines that allow us to do this. Results are presented for trial...
http://mural.maynoothuniversity.ie/289/
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