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Displaying Results 1 - 21 of 21 on page 1 of 1
Marked
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A system for teaching sign language using live gesture feedback
(2008)
Kelly, Daniel; McDonald, John; Markham, Charles
A system for teaching sign language using live gesture feedback
(2008)
Kelly, Daniel; McDonald, John; Markham, Charles
Abstract:
This paper presents a computer vision based virtual learning environment for teaching communicative hand gestures used in Sign Language. A virtual learning environment was developed to demonstrate signs to the user. The system then gives real time feedback to the user on their performance of the demonstrated sign. Gesture features are extracted from a standard web-cam video stream and shape and trajectory matching techniques are applied to these features to determine the feedback given to the user.
http://mural.maynoothuniversity.ie/8343/
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A Wearable sensor-based Exercise biofeedback system: mixed methods evaluation of Formulift
(2018)
O'Reilly, Martin; Slevin, Patrick; Ward, Tomás E.; Caulfield, Brian
A Wearable sensor-based Exercise biofeedback system: mixed methods evaluation of Formulift
(2018)
O'Reilly, Martin; Slevin, Patrick; Ward, Tomás E.; Caulfield, Brian
Abstract:
Background: Formulift is a newly developed mobile health (mHealth) app that connects to a single inertial measurement unit (IMU) worn on the left thigh. The IMU captures users’ movements as they exercise, and the app analyzes the data to count repetitions in real time and classify users’ exercise technique. The app also offers feedback and guidance to users on exercising safely and effectively. Objective: The aim of this study was to assess the Formulift system with three different and realistic types of potential users (beginner gym-goers, experienced gym-goers, and qualified strength and conditioning [S&C] coaches) under a number of categories: (1) usability, (2) functionality, (3) the perceived impact of the system, and (4) the subjective quality of the system. It was also desired to discover suggestions for future improvements to the system. Methods: A total of 15 healthy volunteers participated (12 males; 3 females; age: 23.8 years [SD 1.80]; height: 1.79 m [SD 0.07], body ...
http://doras.dcu.ie/22418/
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Assessing the assessment
(2010)
Rami, Justin; Lorenzi, Francesca
Assessing the assessment
(2010)
Rami, Justin; Lorenzi, Francesca
Abstract:
In essence, ‘learning can be defined as changes in knowledge, understanding, skills and attitudes, brought about by experience and reflection upon that experience’ (Brown, Bull & Pendelbury, 1996, p21). This research highlights how feedback from learners, peers and tutors, augments the experience and reflection, a form of internal feedback, accelerates the learning (Schmidt et al, 1990). The authors draw on their experience as lecturers and course designers for the module “Curriculum Assessment” which is offered to both, traditional full-time undergraduates and part-time professional educators. This paper builds on research described at the 2009 ECER conference, which focused on the introduction of an assessment portfolio that was designed with the aim of promoting a constructivist approach to the development of professional competence among trainee teachers. This new paper focuses on the next stage of the research and highlights how using multiple ‘voices’ from the research ...
http://doras.dcu.ie/15763/
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Breathing Feedback System with Wearable Textile Sensors
(2010)
Mitchell, Edmond; Coyle, Shirley; O’Connor, Noel E.; Diamond, Dermot; Ward, Tomas E.
Breathing Feedback System with Wearable Textile Sensors
(2010)
Mitchell, Edmond; Coyle, Shirley; O’Connor, Noel E.; Diamond, Dermot; Ward, Tomas E.
Abstract:
Breathing exercises form an essential part of the treatment for respiratory illnesses such as cystic fibrosis. Ideally these exercises should be performed on a daily basis. This paper presents an interactive system using a wearable textile sensor to monitor breathing patterns. A graphical user interface provides visual real-time feedback to patients. The aim of the system is to encourage the correct performance of prescribed breathing exercises by monitoring the rate and the depth of breathing. The system is straightforward to use, low-cost and can be installed easily within a clinical setting or in the home. Monitoring the user with a wearable sensor gives real-time feedback to the user as they perform the exercise, allowing them to perform the exercises independently. There is also potential for remote monitoring where the user’s overall performance over time can be assessed by a clinician.
http://mural.maynoothuniversity.ie/2406/
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Channel Signal-to-Noise Ratio Constrained Feedback Control: Performance and Robustness
(2009)
Rojas, A.J.; Braslavsky, J.H.; Middleton, R.H.
Channel Signal-to-Noise Ratio Constrained Feedback Control: Performance and Robustness
(2009)
Rojas, A.J.; Braslavsky, J.H.; Middleton, R.H.
Abstract:
The limitations in performance and robustness imposed by explicitly considering a communication channel in a control loop have received increased attention in recent years. Previous results in the literature have stated these limitations in terms of a minimal transmission data rate necessary for stabilisation. In this paper a signal-to-noise ratio (SNR) approach is used to study two specific cases: (i) performance in terms of model matching and (ii) robustness against a multiplicative uncertainty in the plant model. The analysis performed leads to closed-form expressions that allow the quantification of the extra SNR required in both cases.
http://mural.maynoothuniversity.ie/1880/
Marked
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Feedback control performance over a noisy communication channel.
(2008)
Freudenberg, J.S.; Middleton, R.H.
Feedback control performance over a noisy communication channel.
(2008)
Freudenberg, J.S.; Middleton, R.H.
Abstract:
We consider the problem of minimizing the variance in the output of a plant that is driven by a Gaussian disturbance using measurements of the plant output obtained from a Gaussian channel. For the special case in which only the variance at the terminal time is penalized, we derive an optimal linear timevarying communication and control strategy, and argue that nonlinear strategies cannot achieve better performance.
http://mural.maynoothuniversity.ie/1753/
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Feedback Stabilization Over a First Order Moving Average Gaussian Noise Channel
(2009)
Middleton, Richard H.; Rojas, Alejandro J.; Freudenberg, James S.; Braslavsky, Julio H.
Feedback Stabilization Over a First Order Moving Average Gaussian Noise Channel
(2009)
Middleton, Richard H.; Rojas, Alejandro J.; Freudenberg, James S.; Braslavsky, Julio H.
Abstract:
Recent developments in information theory by Y.-H. Kim have established the feedback capacity of a first order moving average additive Gaussian noise channel. Separate developments in control theory have examined linear time invariant feedback control stabilization under signal to noise ratio (SNR) constraints, including colored noise channels. This note considers the particular case of a minimum phase plant with relative degree one and a single unstable pole at z = ø(with |ø| >1) over a first order moving average Gaussian channel. SNR constrained stabilization in this case is possible precisely when the feedback capacity of the channel satisfies Cfb ≥ log2 |ø|. Furthermore, using the results of Kim we show that there exist linear encoding and decoding schemes that achieve stabilization within the SNR constraint precisely when Cfb ≥ log2 |ø|.
http://mural.maynoothuniversity.ie/1611/
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Feedback Stabilization Over Signal-to-Noise Ratio Constrained Channels.
(2007)
Braslavsky, Julio H.; Middleton, Richard H.; Freudenberg, James S.
Feedback Stabilization Over Signal-to-Noise Ratio Constrained Channels.
(2007)
Braslavsky, Julio H.; Middleton, Richard H.; Freudenberg, James S.
Abstract:
There has recently been significant interest in feedback stabilization problems with communication constraints including constraints on the available data rate. Signal-to-noise ratio (SNR) constraints are one way in which data-rate limits arise, and are the focus of this paper. In both continuous and discrete-time settings, we showthat there are limitations on the ability to stabilize an unstable plant over a SNR constrained channel using finite-dimensional linear time invariant (LTI) feedback. In the case of state feedback, or output feedback with a delay-free, minimum phase plant, these limitations in fact match precisely those that might have been inferred by considering the associated ideal Shannon capacity data rate over the same channel. In the case of LTI output feedback, additional limitations are shown to apply if the plant is nonminimum phase. In this case, we show that for a continuous-time nonminimum phase plant, a periodic linear time varying feedback scheme with fast s...
http://mural.maynoothuniversity.ie/1741/
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Following-Up on Feedback through Repetition inAssessments (in the Science Disciplines)
(2009)
McLoone, Seamus
Following-Up on Feedback through Repetition inAssessments (in the Science Disciplines)
(2009)
McLoone, Seamus
Abstract:
In practice, the student learning cycle involves learning, assessment and feedback. The student learns about a particular topic through a combination of lectures, research and/or action. They are then assessed on what they have learned and are given formative feedback on their performance. Unfortunately, the cycle seems to end at this point. A new topic is presented and the learning cycle repeats. This is typical of a module in which several different topics are covered over the course of a semester. However, some obvious questions emerge. What do the students do with the feedback? Do they really learn from it? How do we know? This paper proposes to follow-up on feedback by simply ensuring that a proportion of the next assessment covers material that students had difficulty with on the previous one. Students are informed of this fact so as to encourage them to actively engage with the feedback. Test results show a marked improvement in the students’ performance, particularly in the ...
http://mural.maynoothuniversity.ie/292/
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Input Disturbance Rejection in Channel Signal-to-Noise Ratio Constrained Feedback Control
(2008)
Rojas, A.J.; Middleton, R.H.; Freudenberg, J.S.; Braslavsky, J.H.
Input Disturbance Rejection in Channel Signal-to-Noise Ratio Constrained Feedback Control
(2008)
Rojas, A.J.; Middleton, R.H.; Freudenberg, J.S.; Braslavsky, J.H.
Abstract:
Communication channels impose a number of obstacles to feedback control. One recent line of work considers the problem of feedback stabilisation subject to a constraint on the channel signal-to-noise ratio (SNR). It has been shown for continuous-time systems that the optimal control problem of achieving the infimal SNR can be formulated as a linear quadratic Gaussian (LQG) control problem with weights chosen as in the loop transfer recovery (LTR) technique. The present paper extends this formulation to: discretetime systems; communications over channels with memory; and input disturbance rejection. By using this formulation, we derive exact expressions for the linear time invariant (LTI) controller that achieves the infimal SNR under the effect of time-delay and additive coloured noise. We then quantify the infimal SNR required for both stabilisation and input disturbance rejection for a relative degree one, minimum phase plant and a memoryless Gaussian channel.
http://mural.maynoothuniversity.ie/2245/
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Intelligent and adaptive tutoring for active learning and training environments
(2009)
Kenny, Claire; Pahl, Claus
Intelligent and adaptive tutoring for active learning and training environments
(2009)
Kenny, Claire; Pahl, Claus
Abstract:
Active learning facilitated through interactive and adaptive learning environments differs substantially from traditional instructor-oriented, classroom-based teaching. We present a Web-based e-learning environment that integrates knowledge learning and skills training. How these tools are used most effectively is still an open question. We propose knowledge-level interaction and adaptive feedback and guidance as central features. We discuss these features and evaluate the effectiveness of this Web-based environment, focusing on different aspects of learning behaviour and tool usage. Motivation, acceptance of the approach, learning organisation and actual tool usage are aspects of behaviour that require different evaluation techniques to be used.
http://doras.dcu.ie/16542/
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Non satis scire (To know is not enough): the impact of Europe's Bologna process on the development of learning and assessment in the context of a higher education institution in Ireland
(2012)
Rami, Justin
Non satis scire (To know is not enough): the impact of Europe's Bologna process on the development of learning and assessment in the context of a higher education institution in Ireland
(2012)
Rami, Justin
Abstract:
‘Education must become the agent rather than the object of change’, (Ball & Tyson, 2011, p.1). This study seeks to explore the impact of aspects of the European Bologna Process and its action lines relating to learning outcomes and student centred learning. Chris Rust (2002) suggests that there has been a paradigm shift in the espoused rhetoric of higher education, from a focus on teaching to a focus on learning. However he also warns, that in relation to Europe, ‘there does appear to be a significant lag in the connection between changes in teaching methods and changes in assessment’ (p.2). The study uses a mixed model approach to examining the research question. The research uses within-‐stage embedded case studies, extant data and interviews to examine the impact of a move towards a learning outcomes approach with a focus on the teacher-student relationship towards assessment in Dublin City University. The findings suggest that at the macro level the Bologna Process has impa...
http://doras.dcu.ie/17509/
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On the achievable delay margin using LTI control for unstable plants.
(2007)
Middleton, Richard H.; Miller, Daniel E.
On the achievable delay margin using LTI control for unstable plants.
(2007)
Middleton, Richard H.; Miller, Daniel E.
Abstract:
Handling delays in control systems is difficult and is of long-standing interest. It is well known that, given a finite-dimensional linear time-invariant (FDLTI) plant and controller forming a strictly proper stable feedback connection, closed-loop stability will be maintained under a small delay in the feedback loop, although most closed loop systems become unstable for large delays. One previously unsolved fundamental problem in this context is whether, for a given FDLTI plant, an arbitrarily large delay margin can be achieved using LTI control. Here, we adopt a frequency domain approach and demonstrate that, for a strictly proper real rational plant, there is a uniform upper bound on the delay that can be tolerated when using an LTI controller, if and only if the plant has at least one closed right half plane pole not at the origin. We also give several explicit upper bounds on the achievable delay margin, and, in some special cases, demonstrate that these bounds are tight.
http://mural.maynoothuniversity.ie/1709/
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Optimal Signal to Noise Ratio in Feedback over Communication Channels with Memory
(2006)
Rojas, A.J.; Freudenberg, J.S.; Braslavsky, J.H.; Middleton, R.H.
Optimal Signal to Noise Ratio in Feedback over Communication Channels with Memory
(2006)
Rojas, A.J.; Freudenberg, J.S.; Braslavsky, J.H.; Middleton, R.H.
Abstract:
Communication channels impose a number of obstacles to feedback control, such as delay, noise, and constraints in communication data-rate. One alternate line of recent work considers the problem of feedback stabilization subject to a constraint in the signal-to-noise ratio (SNR). It has been shown for continuous-time systems that the optimal control problem arising in achieving minimal SNR can be formulated as a linear quadratic Gaussian (LQG) control problem with weights chosen as in the loop transfer recovery (LTR) technique. The present paper extends such LQG/LTR formulation to discretetime systems with feedback over channels with memory. By using such formulation, we derive exact expressions for the LTI controller and loop sensitivity functions that achieve minimal SNR under the effect of time-delay, non minimum phase zeros and colored additive noise. For the minimum-phase case with white noise and no time delay, we show that the optimal feedback loop obtained after applying LTR...
http://mural.maynoothuniversity.ie/1789/
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Output Feedback Stabilisation over Bandwidth Limited, Signal to Noise Ratio Constrained Communication Channels.
(2006)
Rojas, Alejandro J.; Braslavsky, Julio H.; Middleton, Richard H.
Output Feedback Stabilisation over Bandwidth Limited, Signal to Noise Ratio Constrained Communication Channels.
(2006)
Rojas, Alejandro J.; Braslavsky, Julio H.; Middleton, Richard H.
Abstract:
Stabilisability of an open loop unstable plant is studied under the presence of a bandwidth limited additive coloured noise communication channel with constrained Signal to Noise Ratio. The problem is addressed through the use of an LTI filter explicitly modelling the bandwidth limitation, and another LTI filter to model the additive coloured noise. Results in this paper show that a bandwidth limitation increases the minimum value of Signal to Noise Ratio required for stabilisability, in comparison to the infinite bandwidth, white noise case. Examples are used to illustrate the results in the continuous and discrete framework.
http://mural.maynoothuniversity.ie/1754/
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Personalised correction, feedback, and guidance in an automated tutoring system for skills training
(2008)
Pahl, Claus; Kenny, Claire
Personalised correction, feedback, and guidance in an automated tutoring system for skills training
(2008)
Pahl, Claus; Kenny, Claire
Abstract:
In addition to knowledge, in various domains skills are equally important. Active learning and training are effective forms of education. We present an automated skills training system for a database programming environment that promotes procedural knowledge acquisition and skills training. The system provides support features such as correction of solutions, feedback and personalised guidance, similar to interactions with a human tutor. Specifically, we address synchronous feedback and guidance based on personalised assessment. Each of these features is automated and includes a level of personalisation and adaptation. At the core of the system is a pattern-based error classification and correction component that analyses student input.
http://doras.dcu.ie/16140/
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Quantifying participation in, and the effectiveness of, remediating assessment in a university mathematics module
(2018)
Howard, Emma; Meehan, Maria; Parnell, Andrew
Quantifying participation in, and the effectiveness of, remediating assessment in a university mathematics module
(2018)
Howard, Emma; Meehan, Maria; Parnell, Andrew
Abstract:
In Maths for Business, a large first-year mathematics module, the continuous assessment component comprises 10 weekly quizzes which combine to contribute 40% of the final module mark. If students did not receive the full five marks on their weekly quiz, they were provided with the opportunity to resubmit their corrected weekly quiz with an explanation of their error(s) for one additional mark. We refer to this process as ‘remediation’. Of the students who had the opportunity to remediate, ∼70% did. Through examining learning management system data, we show that the remediation process encouraged students to access module resources. Furthermore, by using a Bayesian hierarchical model to account for students’ level of participation, achievement and prior knowledge, we show that participation in the remediation process positively impacted the final examination marks of moderate to high achieving students (based on initial continuous assessment marks). However, participation in the reme...
http://mural.maynoothuniversity.ie/14022/
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Show me the way to Monte Carlo: density based trajectory navigation.
(2007)
Strachan, Steven; Williamson, John; Murray-Smith, Roderick
Show me the way to Monte Carlo: density based trajectory navigation.
(2007)
Strachan, Steven; Williamson, John; Murray-Smith, Roderick
Abstract:
We demonstrate the use of uncertain prediction in a system for pedestrian navigation via audio with a combination of Global Positioning System data, a music player, inertial sensing, magnetic bearing data and Monte Carlo sampling for a density following task, where a listener’s music is modulated according to the changing predictions of user position with respect to a target density, in this case a trajectory or path. We show that this system enables eyes-free navigation around set trajectories or paths unfamiliar to the user and demonstrate that the system may be used effectively for varying trajectory width and context.
http://mural.maynoothuniversity.ie/1705/
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Stabilization with Disturbance Attenuation over a Gaussian Channel
(2007)
Freudenberg, J.S.; Middleton, R.H.; Braslavsky, J.H.
Stabilization with Disturbance Attenuation over a Gaussian Channel
(2007)
Freudenberg, J.S.; Middleton, R.H.; Braslavsky, J.H.
Abstract:
We propose a linear control and communication scheme for the purposes of stabilization and disturbance attenuation when a discrete Gaussian channel is present in the feedback loop. Specifically, the channel input is amplified by a constant gain before transmission and the channel output is processed through a linear time invariant filter to produce the control signal. We show how the gain and filter may be chosen to minimize the variance of the plant output. For an order one plant, our scheme achieves the theoretical minimum taken over a much broader class of compensators.
http://mural.maynoothuniversity.ie/1722/
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Y1Feedback - The Story so Far: Progress and Reflections from an Irish Multi-institutional Learning and Teaching Enhancement Project
(2016)
O'Regan, Lisa; Harding, Nuala; Brown, Mark; Maguire, Moira; Munro, Morag; McDermot...
Y1Feedback - The Story so Far: Progress and Reflections from an Irish Multi-institutional Learning and Teaching Enhancement Project
(2016)
O'Regan, Lisa; Harding, Nuala; Brown, Mark; Maguire, Moira; Munro, Morag; McDermott, Geraldine; Ryan, Seamus; Farrell, Orna; Cranny, David
Abstract:
The Y1Feedback Project is a multi-institutional learning and teaching enhancement project that aims to support the transition to Higher Education by using digital technologies to enhance feedback in the first year. The project is funded by the National Forum for the Enhancement of Teaching and Learning in HE under the 2014 Enhancement fund. This paper outlines the project development and progress, with particular focus on identification of the feedback approaches that we are developing case studies of as part of this initiative. Although the project is not complete, the outcome of initial evaluations is reported and we reflect on the process and challenges encountered.
http://mural.maynoothuniversity.ie/9372/
Marked
Mark
Y1Feedback - The Story so Far: Progress and Reflections from an Irish Multiinstitutional Learning and Teaching Enhancement Project
(2016)
O'Regan, Lisa; Harding, Nuala; Brown, Mark; Maguire, Moira; McDermott, Geraldine; ...
Y1Feedback - The Story so Far: Progress and Reflections from an Irish Multiinstitutional Learning and Teaching Enhancement Project
(2016)
O'Regan, Lisa; Harding, Nuala; Brown, Mark; Maguire, Moira; McDermott, Geraldine; Ryan, Seamus; Farrell, Orna; Cranny, David; Gallagher, Gerry; Mckevitt, Conor
Abstract:
The Y1Feedback Project is a multi-institutional learning and teaching enhancement project that aims to support the transition to Higher Education by using digital technologies to enhance feedback in the first year. The project is funded by the National Forum for the Enhancement of Teaching and Learning in HE under the 2014 Enhancement fund. This paper outlines the project development and progress, with particular focus on identification of the feedback approaches that we are developing case studies of as part of this initiative. Although the project is not complete, the outcome of initial evaluations is reported and we reflect on the process and challenges encountered.
http://doras.dcu.ie/24134/
Displaying Results 1 - 21 of 21 on page 1 of 1
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