Digital Commons Network^™

Technological Capability And Logistical Reality, Randal Faulkner, Edward Sweeney

Other Resources

No abstract provided.

Clinical Assessment Of The Quantitative Posturography System (Qps), Jacinta Browne, G. O'Hare, A. Finn, J. Colin

Articles

The objectives of this study were to evaluate a novel design dynamic force platform the Quantitative Posturography System (QPS). The evaluation consisted of identifying the effects due to ageing and disease of the postural control system and also to examine the relationship between functional performance and postural sway. An AOVA design and Pearson-Product correlation design were used. Seventy healthy subjects, seven subjects with Parkinson’s disease and eight subjects with a history of falls took part in the study. It was found that the QPS was able to identify changes due to both the ageing process and disease on the postural …

Initial Experiences Gained And Initiatives Employed In The Teaching Of Java Programming In The Institute Of Technology Tallaght, Eamonn Hyland, Gary Clynch

Conference Papers

This paper describes recent experiences gained and initiatives employed in the teaching of Java programming to first and second year students in the Institute of Technology Tallaght from September 2000 to March 2002. It outlines some elearning, technological and pedagogical initiatives that were undertaken within the department and the resultant preliminary outcomes. The outcomes have been determined after detailed analysis of the results of a survey which was commissioned to determine the effectiveness of the initiatives and also to identify those parts of the Java language which were causing students particular difficulty. The students surveyed are currently completing their fourth …

Flow Patterns In A Two-Roll Mill, Christopher Hills

Articles

The two-dimensional flow of a Newtonian fluid in a rectangular box that contains two disjoint, independently-rotating, circular boundaries is studied. The flow field for this two-roll mill is determined numerically using a finite-difference scheme over a Cartesian grid with variable horizontal and vertical spacing to accommodate satisfactorily the circular boundaries. To make the streamfunction numerically determinate we insist that the pressure field is everywhere single-valued. The physical character, streamline topology and transitions of the flow are discussed for a range of geometries, rotation rates and Reynolds numbers in the underlying seven-parameter space. An account of a preliminary experimental study of …

Discrete-Time Velocity-Based Multiple Model Networks, Ruiyao Gao, Seamus Mcloone, Eugene Dermot Coyle Professor

Conference papers

The velocity-based local model (LM) network is a novel modelling approach that overcomes the lack of interpretability associated with the conventional LM network technique. The global dynamics of the nonlinear network are directly related to the underlying sub-model dynamics. Thus, the velocity-based network is ideally suited to the development of local controller (LC) networks. Furthermore, the local models are continuous-time, velocity-based and linear, providing continuity with established linear theory. To date, research has focused on the continuous-time version of the velocity-based network. The application of digital computer is widely popular in the field of control and, therefore, this paper develops …

A Non-Linear Pid Controller For Cstr Using Local Model Networks, Ruiyao Gao, Aidan O'Dwyer, Eugene Dermot Coyle Professor

Conference papers

The basic PID controllers have difficulty in dealing with problems that appear in complex non-linear processes. This paper presents a practical non-linear PID controller that deals with these non-linear difficulties. It utilises a local model (LM) network, which combines a set of local models within an artificial neural network structure, to adaptively characterise the process non-linearity. Then a local controller network is formulated through a gating system deduced from the LMN to handle the non-linearity. A continuous stirred tank reaction (CSTR) case study illustrates the practicality of this method in the modelling and control of non-linear processes. PID controllers are …

Time Delay Estimation In Signal Processing Applications: An Overview, Aidan O'Dwyer

Conference papers

An extensive though scattered literature exists on the estimation of time delays in signal processing applications. However, it is possible to identify themes that are common to many of the available techniques. The intention of this paper is to provide a framework against which the literature may be viewed. In addition, original work on gradient based time delay estimation is described.

Towards An Expert System Approach For Pi Controller Design Of Delayed Processes, Michael Feeney, Aidan O'Dwyer

Conference papers

This paper will discuss the compensation of first order lag plus time delay (FOLPD) processes using PI controllers whose parameters are specified using appropriate tuning rules. The gain margin and phase margin of the compensated system, as the ratio of time delay to time constant of the process varies, are calculated for each tuning rule and an expert system is used to recommend a tuning rule for user defined requirements.

Regenerative Magnet Load Power Supply With Utility Friendly Operations, M. Sri Balaji, S. P. Das, Gopal Dubey, Malabika Basu

Conference papers

In the present paper, a utility friendly regenerative magnet load power supply has been proposed which can tolerate supply voltage dips and long duration sags or undervoltages and maintains unity input power factor under all operating conditions. The harmonics injected into the utility are much less and the total harmonic distortion (THD) complies with IEEE standards. Unity power factor at the input is maintained by using a synchronous link converter (SLC) as the front-end AC to DC converter with regenerative capability. The two-quadrant chopper in the second stage operates in a constant frequency current control mode and takes care of …

Calculation For The Parameter "Deflection" In A New Theory Of The Earth's Magnetic Field, Annraoi De Paor, Ted Burke

Articles

In a recent paper on the theory of the Earth’s magnetic field and key features of Sunspot activity (de Paor, 2001), a central role in the calculation of secular variations of the geomagnetic field was played by a newly-introduced parameter called the deflection (abbreviated def ). In this note, the significance of def is elucidated and the method used to calculate it is explained

Model Predictive Control Of Cstr Based On Local Model Networks, Ruiyao Gao, Aidan O'Dwyer, Eugene Dermot Coyle Professor

Conference papers

A non-linear predictive controller is presented. It judiciously combines predictive controllers with a local model network utilizing a neural-network-like gating system. It avoids the time consuming quadratic optimization calculation, which is normally necessary in non-linear predictive control. A controller simulation on a Continuous Stirred Tank Reactor (CSTR) case study was shown to be satisfactory both in terms of set point tracking and regulation performance over the entire operating range. Moreover, the inherent integration action in the local predictive controller provides zero static offsets.

Closed Loop Identification Of A First Order Plus Dead-Time Process Model Under Pi Control, Tony Kealy, Aidan O'Dwyer

Conference papers

This paper discusses the estimation of the parameters of a first order plus dead-time process model using the closed-loop step response data of the process under proportional plus integral (PI) control. The proportional gain and the integral time, in the PI controller, are chosen such that the closed-loop step response exhibits an under-damped response. From this response data, five characteristic points are used to determine a second order plus dead-time model and subsequently, the frequency response of the closed-loop system. Knowing the dynamics of the closed-loop system and the dynamics of the controller, the open-loop dynamics of the process can …

Comparison Of Open And Closed Loop Process Identification Techniques In The Time Domain, Tony Kealy, Aidan O'Dwyer

Conference papers

This paper describes seven methods to identify a mathematical model for a real process with a time delay. The process is the Process Trainer, PT326 from Feedback Instruments Limited. Six of the methods use the step response data and one of the methods uses the impulse response data for identification.

Tourism Destination Planning, Neil Andrews, Sheila Flanagan, Joseph Ruddy

Books

No abstract provided.

The Cultural Economy Of Dublin, Ellen Hazelkorn, Colm Murphy

Books/Book chapters

This article examines the growth between 1990 to 2000 of the interactive media industry in the Dublin area. In this period it became a world leader in the development of electronic leading companies. The article assesses the role the state played in the development of this cluster.

Holographically Recorded Photopolymer Diffractive Optical Element For Holographic And Electronic Speckle Pattern Interferometry, Sridhar Guntaka, Vincent Toal, Suzanne Martin

Articles

A diffractive optical element is described that can be used to implement a self-aligning electronic speckle apttern interferometer and holographic interferometer requiring only a laser source and a camera in the optical set-up.

Flow Shop Scheduling Problem: A Computational Study, Amr Arisha, Paul Young, Mohie El Baradie

Conference papers

A computational study has been developed to obtain optimal / near optimal solution for the flow shop scheduling problem with make-span minimization as the primary criterion and the minimization of either the mean completion time, total waiting time or total idle time as the secondary criterion. The objective is to determine a sequence of operations in which to process ‘n’ jobs on ‘m’ machines in same order (flow shop environment) where skipping is allowed. The Simulation approach for deterministic and stochastic flow shop scheduling has been developed. It reads and manipulates data for 500 jobs on 500 machines. Different factorial …

Irish Marketing Review, Vol. 15, No. 2, 2002, Aidan O'Driscoll

Issues

The Irish Marketing Review deals with issues, developments, research and practice in Marketing. This is a special joint issue in association with the Korean Academy of Marketing Science on " Researching the Cybermarket".

Innovation, Vol. 1, Issue 2, June, 2002, Unknown

Issues

No abstract provided.

Innovation, Vol. 1, Issue 3, Autumn 2002, Unknown

Issues

No abstract provided.

2002 : Part - Time Courses, Dublin Institute Of Technology

DIT Publications

Book containing information and full list of part - time courses for 2002 entry.

2002/2003 academic calendar.

Faculty structure and key contacts at DIT.

Ancient Astronomical Alignments: Fact Or Fiction?, Frank Prendergast

Articles

No abstract provided.

Sub-Band Independent Subspace Analysis For Drum Transcription, Derry Fitzgerald, Robert Lawlor, Eugene Coyle

Conference papers

While Independent Subspace Analysis provides a means of separating sound sources from a single channel signal, making it an effective tool for drum transcription, it does have a number of problems. Not least of these is that the amount of information required to allow separation of sound sources varies from signal to signal. To overcome this indeterminacy and improve the robustness of transcription an extension of Independent Subspace Analysis to include sub-band processing is proposed. The use of this approach is demonstrated by its application in a simple drum transcription algorithm.

Bs News

Building Services Engineering

No abstract provided.

The Development Of A Computer Program To Co-Ordinate Early Design Stage Information, Bernard Denver

Masters

local and global environment is becoming increasingly important. Several methods and procedures have been adopted to encourage designers and engineers to become more environmentally friendly and energy conscious. The advance of computer simulation and modelling of buildings has been successful in addressing potential problems in the design process while providing additional information otherwise not available to the design team. However, it is the purpose of this thesis to use this information and benefits of simulation and modelling at an earlier stage in the design. This thesis endeavours to investigate the requirements and benefits and integrated Early Design Stage program would …

Deploying Integrated Web-Based Spatial Applications Within An Oracle Database Environment, James Carswell

Conference papers

In this paper, we describe the architectural and functional characteristics of e-Spatial™ technology, comprising an innovative software package that represents a timely alternative to traditional and complex proprietary GIS application packages. The two main components of the package, developed by e- Spatial Solutions, are the iSMART™ database development technology and the i-Spatial™ Information Server (iSIS), both implemented within an Oracle 9i Spatial database environment. This technology allows users to build and deploy spatially enabled or standard Internet applications without requiring any application-specific source code. It can be deployed on any Oracle supported hardware platform and on any device that supports …

Supply Chain Management And The Business Model Of The 21st Century, Edward Sweeney, Randall Faulkner

Practitioner Journals

No abstract provided.

Bs News

Building Services Engineering

No abstract provided.

Dit Independent, 1st.-30th. November, 2001, Dit:Students Union

DIT Student Union

No abstract provided.

Bs News

Building Services Engineering

No abstract provided.