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Subject = Engineering, Ph.D.;
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Displaying Results 1 - 25 of 1147 on page 1 of 46
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2:1 The Paper Tube Project
(2012)
Brady, Noel
2:1 The Paper Tube Project
(2012)
Brady, Noel
Abstract:
Review of applied technological solution to rapid building techniques using paper tube and analogous materials to create space enclosing geodesic systems.
https://arrow.dit.ie/bescharcart/28
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A 38 GHz On-Chip Antenna in 28-nm CMOS using Artificial Magnetic Conductor for 5G Wireless Systems
(2016)
Ammann, Max
A 38 GHz On-Chip Antenna in 28-nm CMOS using Artificial Magnetic Conductor for 5G Wireless Systems
(2016)
Ammann, Max
Abstract:
This paper presents the first-ever millimeter wave on-chip antenna (AoC) in 28 nm CMOS technology. The addition of artificial magnetic conductor (AMC) can increase the antenna's power gain and radiation efficiency to -1.75 dBi and 22%, respectively, with an occupied area of 0.95 mm×4.75 mm at 38 GHz. This structure is intended for fully integrated single-chip nanometer CMOS transceivers for 5G communication systems.
https://arrow.dit.ie/engschececon/56
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A 3D visualisation to enhance cognition in software product line engineering
(2009)
Cawley, Ciarán; Botterweck, Goetz; Healy, Patrick; Bin Abid, Saad; Thiel, Steffen
A 3D visualisation to enhance cognition in software product line engineering
(2009)
Cawley, Ciarán; Botterweck, Goetz; Healy, Patrick; Bin Abid, Saad; Thiel, Steffen
Abstract:
Software Product Line (SPL) Engineering is a development paradigm where core artefacts are developed and subsequently configured into different software products dependent on a particular customer's requirements. In industrial product lines, the scale of the configuration (variability management) can become extremely complex and very difficult to manage. Visualisation is widely used in software engineering and has proven useful to amplify cognition in data intensive applications. Adopting this approach within software product line engineering can help stakeholders in supporting essential work tasks by enhancing their understanding of large and complex product lines. In this paper we present our research into the application of visualisation techniques and cognitive theory to address SPL complexity and to enhance cognition in support of the SPL engineering processes. Specifically we present a 3D visualisation approach to enhance stakeholder cognition and thus support variability...
http://hdl.handle.net/10344/2244
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A Bend Loss Based Singlemode Fiber Micro-displacement Sensor
(2010)
Wang, Pengfei; Semenova, Yuliya; Wu, Qiang; Farrell, Gerald
A Bend Loss Based Singlemode Fiber Micro-displacement Sensor
(2010)
Wang, Pengfei; Semenova, Yuliya; Wu, Qiang; Farrell, Gerald
Abstract:
An all-fiber displacement sensor with a simple configuration is proposed and investigated theoretically and experimentally. The proposed fiber displacement sensor consists of a half-loop structure of high-bend loss singlemode fiber-1060XP. A ratiometric power measurement system for interrogating the proposed sensor is also presented. By measuring the change in ratio of bend loss in the ratiometric measurement system, a change in displacement can be measured assuming the ratiometric system is calibrated. The proposed macrobending fiber based displacement sensor achieves a competitive resolution of circa 0.33 μm and also benefits from simplicity compared with the conventional fiber Bragg grating based displacement sensor. The bend loss fiber based displacement sensing system is sensitive to temperature, but the ratio response has a linear variation with temperature, which can be corrected by a suitable displacement correction process. Corresponding investigation on the temperature dep...
https://arrow.dit.ie/engscheceart/95
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A Case Study in Modeling and Process Control: the Control of a Pilot Scale Heating and Ventilation System
(2006)
Mooney, Robin; O'Dwyer, Aidan
A Case Study in Modeling and Process Control: the Control of a Pilot Scale Heating and Ventilation System
(2006)
Mooney, Robin; O'Dwyer, Aidan
Abstract:
This paper details the control of a pilot scale laboratory heating and ventilation system. The system is represented in 2x2 multi-input, multi-output (MIMO) form. A process reaction curve identification technique was used to model (in first order lag plus delay - FOLPD - form) the flow process and temperature process portions of the system, over a range of operating conditions. Tests revealed that both processes were continuously non-linear. A gain scheduler with static decoupling was designed, using look-up tables, to continuously interpolate for the most suitable proportional-integral (PI) or proportional-integral-derivative (PID) controller settings and decoupler gains. The contribution of this paper is the careful application, using well-known techniques, of a complete controller design cycle for a laboratory scale system.
https://arrow.dit.ie/engscheleart/18
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A classification of techniques for the compensation of time delayed processes. Part 1: Parameter optimised controllers
(1999)
O'Dwyer, Aidan; Ringwood, John
A classification of techniques for the compensation of time delayed processes. Part 1: Parameter optimised controllers
(1999)
O'Dwyer, Aidan; Ringwood, John
Abstract:
An extensive literature exists on the compensation of time delayed processes. It is possible to identify themes that are common to many of the available techniques. The intention of the two parts of this paper is to provide a framework against which the literature may be viewed; Part 1 of the paper considers the use of parameter optimised controllers for the compensation problem, with Part 2 of the paper considering the use of structurally optimised compensators. Conclusions are drawn at the end of Part 2.
https://arrow.dit.ie/engscheleart/56
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A classification of techniques for the compensation of time delayed processes. Part 2: Structurally optimised controllers
(1999)
O'Dwyer, Aidan; Ringwood, John
A classification of techniques for the compensation of time delayed processes. Part 2: Structurally optimised controllers
(1999)
O'Dwyer, Aidan; Ringwood, John
Abstract:
Following on from Part 1, Part 2 of the paper considers the use of structurally optimised controllers to compensate time delayed processes.
https://arrow.dit.ie/engscheleart/62
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A Collagen Based Tissue Engineered Heart Valve Shows Excellent Functionality and Remodelling After Dynamic Conditioning
(2015)
Brougham, Claire; Moreira, Ricardo; Levingstone, Tanya J; Jockenhoevel, Stefan; Mela, P...
A Collagen Based Tissue Engineered Heart Valve Shows Excellent Functionality and Remodelling After Dynamic Conditioning
(2015)
Brougham, Claire; Moreira, Ricardo; Levingstone, Tanya J; Jockenhoevel, Stefan; Mela, Petra; O'Brien, Fergal J
https://arrow.dit.ie/engschmeccon/68
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A Compact Wide-band Shorted Folded Antenna
(2006)
Ruvio, Giuseppe; Ammann, Max
A Compact Wide-band Shorted Folded Antenna
(2006)
Ruvio, Giuseppe; Ammann, Max
https://arrow.dit.ie/engschececon/5
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A Comparative Study of Zn-Mn Electrodeposition From Deep Eutectic Solvents and Aqueous Electrolytes
(2016)
Bajat, Jelena; Bucko, Mihael; Culliton, David; Betts, Tony
A Comparative Study of Zn-Mn Electrodeposition From Deep Eutectic Solvents and Aqueous Electrolytes
(2016)
Bajat, Jelena; Bucko, Mihael; Culliton, David; Betts, Tony
Abstract:
The production of Zn-Mn coatings with high Mn and low oxygen content from additive free choline chloride/urea deep eutectic solvent (DES) is reported in this work. Alloy coatings containing high Mn contents (~30 at.% Mn) show the highest corrosion resistance amongst zinc alloys [1]. However, in order to obtain Mn-rich deposits on steel from a simple aqueous bath, a significant cathodic polarization or high deposition current density is necessary. Under such conditions, the Zn 2+ reduction reaction is under diffusion control, leading to the formation and growth of dendrites. In addition intensive hydrogen evolution significantly reduces the current efficiency, often leading to the formation of porous coatings containing large amounts of oxygen [2]. It has been shown that a dendritic deposit formation and hydrogen reduction during Zn-Mn electrodeposition at high current densities could be prevented through use of plating additives [3]. By utilising DES instead of an aqueous electrolyt...
https://arrow.dit.ie/engschmeccon/63
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A comparison of techniques for time delay estimation
(1993)
O'Dwyer, Aidan
A comparison of techniques for time delay estimation
(1993)
O'Dwyer, Aidan
Abstract:
This paper reviews some of the techniques used for the identification of unknown lumped time delays in single input, single output (SISO) control systems and evaluates a number of these techniques in simulation and in implementation. Both off line and on line identification techniques are considered.
https://arrow.dit.ie/engscheleart/82
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A computational and experimental investigation of the dissection of arterial tissue
(2020)
FitzGibbon, Brian
A computational and experimental investigation of the dissection of arterial tissue
(2020)
FitzGibbon, Brian
Abstract:
The overall objective of this thesis is to provide a new understanding of the mechanisms underlying arterial fracture, and to extend this understanding to the initiation and propagation of aortic dissection using a combination of experimental testing and computational modelling. Aortic dissection is a lethal disease that involves the separation of the arterial layers and carries mortality rates as high as 1-2% per hour untreated. However, to date the exact pathophysiological processes and related biomechanisms underlying aortic dissection have not been uncovered. We present the development and implementation of a novel experimental technique to generate and characterise mode II crack initiation and propagation in arterial tissue. We begin with a demonstration that lap-shear testing of arterial tissue results in mixed mode fracture, rather than mode II. A detailed computational design of a novel experimental method (shear fracture ring test (SFRT)) to robustly and repeatably generate...
http://hdl.handle.net/10379/16309
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A computational and experimental investigation of the in-vivo biomechanics of the human aorta
(2020)
Concannon, Jamie
A computational and experimental investigation of the in-vivo biomechanics of the human aorta
(2020)
Concannon, Jamie
Abstract:
The overall objective of this thesis is to provide a new understanding of the degree of biomechanical heterogeneity that exists along the human aorta, against the backdrop of clinical literature reporting that patient outcomes depend on the distance of aortic repair from the heart. Spatial variance in human aortic bioarchitecture responsible for the elasticity of the vessel is poorly understood. We present a quantification of the constituents responsible for aortic compliance, namely, elastin, collagen and smooth muscle cells, using histological and stereological techniques along the vessel length. Using donated cadaveric tissue, a series of samples were excised between the proximal ascending aorta and the distal abdominal aorta, for five cadavers, each of which underwent various staining procedures to enhance specific constituents of the wall. Using polarised light microscopy techniques, the orientation of collagen fibres was studied for each location and each tunical layer of the ...
http://hdl.handle.net/10379/16050
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A critical assessment of hydrodemolition as a technique for the removal of defective concrete
(2012)
Clerkin, Mark
A critical assessment of hydrodemolition as a technique for the removal of defective concrete
(2012)
Clerkin, Mark
Abstract:
The purpose of this thesis is critically asses the merits of hydrodemolition as technique to remove defective concrete.
http://eprints.dkit.ie/386/
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A Critical Realist Approach to Engineering Ethics
(2015)
Conlon, Eddie
A Critical Realist Approach to Engineering Ethics
(2015)
Conlon, Eddie
Abstract:
This paper is focused on the teaching of engineering ethics (EE). Through a focus on safety and the lens of what sociologists call the agency/ structure relationship it examimes various approaches to this teaching. Drawing on Critical Realism it argues there are deficiencies in both the dominant approach and a number of proposed alternatives as they suffer from various forms of conflationism . By drawing on Critical Realism (CR) a more robust agenda for teaching engineering ethics can be developed. It is argued that CR offers a basis for understanding the range of factors which lead to accidents and disasters. It allows for a fuller consideration of agency/structure relations and the importance of changing the contexts in which engineers work in order to allow them to hold paramount the health, safety and welfare of the public.
https://arrow.dit.ie/engineduccon/26
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A Critical Realist Approach to Engineering Ethics
(2015)
Conlon, Eddie
A Critical Realist Approach to Engineering Ethics
(2015)
Conlon, Eddie
Abstract:
This paper is focused on the teaching of engineering ethics (EE). Through a focus on safety and the lens of what sociologists call the agency/ structure relationship it examimes various approaches to this teaching. Drawing on Critical Realism it argues there are deficiencies in both the dominant approach and a number of proposed alternatives as they suffer from various forms of conflationism . By drawing on Critical Realism (CR) a more robust agenda for teaching engineering ethics can be developed. It is argued that CR offers a basis for understanding the range of factors which lead to accidents and disasters. It allows for a fuller consideration of agency/structure relations and the importance of changing the contexts in which engineers work in order to allow them to hold paramount the health, safety and welfare of the public.
https://arrow.dit.ie/schmuldistcon/8
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A Fast-Response, High- Temperature Microfiber Coupler Thermometer
(2012)
Ding, Ming; Wang, Pengfei; Brambilla, Gilberto
A Fast-Response, High- Temperature Microfiber Coupler Thermometer
(2012)
Ding, Ming; Wang, Pengfei; Brambilla, Gilberto
Abstract:
A compact temperature sensor based on a broadband microfiber coupler tip is demonstrated. The thermometer dynamic range spans from room temperature to 1511 with a response time of tens of milliseconds. This is the highest temperature measured with a silica optical fiber device. A resolution of 0.66 was achieved for a coupler tip diameter of . Better resolution can be achieved with smaller sized microfiber coupler tips.
https://arrow.dit.ie/engscheceart/128
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A Framework to Develop Lifelong Learning and Transferable Skills in an Engineering Programme
(2010)
Duffy, Gavin; Bowe, Brian
A Framework to Develop Lifelong Learning and Transferable Skills in an Engineering Programme
(2010)
Duffy, Gavin; Bowe, Brian
Abstract:
Engineering programmes have a strong reputation in the delivery of technical knowledge and skills. Graduates need equally high levels of competence in personal and professional skills to not only meet the existing requirements of employers and professional bodies but to also help them manage the inevitable changes that society is facing in an increasingly populated world. The need to move from traditional to student-centred learning is discussed in the context of engineering education. The use of group-based, problem driven learning facilitates high integration of technical and non-technical knowledge and skills and requires more engagement with the programme from today’s student. Personal skills should be developed from a low base in a progressive, structured manner over the entire programme. A framework is presented to help those in curriculum design to develop learning, teaching and assessment methods that are in alignment with the delivery of all the intended learning outcomes i...
https://arrow.dit.ie/engscheleart/130
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A frequency domain based self-tuning PID controller
(1994)
Ringwood, John; O'Dwyer, Aidan
A frequency domain based self-tuning PID controller
(1994)
Ringwood, John; O'Dwyer, Aidan
Abstract:
Traditionally, both explicit and implicit self-tuning controllers have employed time domain techniques for the identification and tracking of plant and controller parameters. The use of the frequency domain provides concise information on the dynamics of the process which has led to its wide acceptance as a domain for controller design. This paper demonstrates a method employing recursive, on-line measurement of the process frequency response, with a straightforward calculation of PID controller parameters. The computational effort involved is comparable with that of a time domain technique.
https://arrow.dit.ie/engscheleart/52
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A Gap Model for Understanding the Variation of the Real Product from the Ideal
(2005)
Delaney, Kevin; Phelan, Pat; Delaney, Declan
A Gap Model for Understanding the Variation of the Real Product from the Ideal
(2005)
Delaney, Kevin; Phelan, Pat; Delaney, Declan
Abstract:
Clients have an idealised view of the appearance and functionality of the products they are sourcing. Their product requirements vary according to their specific circumstances and experiences. When designers try to meet or surpass client expectations, variation results and the product will deviate from the client’s idealised view. This often results in frustration, disappointment and rework for everyone concerned. Consequently designers must understand the sources of variation affecting their products and the techniques and tools that they can employ to reduce the negative effects of this variation. This paper examines the factors influencing clients as they formulate their expectations. It investigates why product variation causes the final product delivered to the client to vary from that expected. A gap model is proposed that visually describes the variation and assists in its understanding. This model introduces the concept of gaps and it is these gaps that need to be closed so...
https://arrow.dit.ie/engschmeccon/13
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A Hardware One-Time Pad Prototype Generator for Localising Cloud Security
(2017)
Tobin, Paul; Tobin, lee; McKeever, Mick; Blackledge, Jonathan
A Hardware One-Time Pad Prototype Generator for Localising Cloud Security
(2017)
Tobin, Paul; Tobin, lee; McKeever, Mick; Blackledge, Jonathan
Abstract:
In this paper, we examine a system for encrypting data before storing in the Cloud. Adopting this system gives excellent security to stored data and complete control for accessing data by the client at different locations. The motivation for developing this personal encryption came about because of poor Cloud security and doubts over the safety of public encryption algorithms which might contain backdoors. However, side-channel attacks and other unwanted third-party interventions in Cloud security, probably contribute more to the poor security record history. These factors led to the development of a prototype for personalising security locally which defeats cryptanalysis. The key distribution problem associated with random binary sequences called one-time-pads, does not exist for one-to-Cloud applications, unlike bidirectional communications where it was a big issue. The random binary sequences were generated from chaotic analogue oscillators with initial conditions from a data rec...
https://arrow.dit.ie/engscheleart/256
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A Heat Pump Assisted Shower
(1983)
McGovern, Jim
A Heat Pump Assisted Shower
(1983)
McGovern, Jim
Abstract:
An energy-efficient water-heating system for a shower is proposed consisting of a low-powered heat pump, a storage tank and an instantaneous heater which, it is felt, may yield a favourable overall cost, in addition to reducing the primary energy consumption. Some preliminary work has been carried out in exploring this concept. It was considered at the outset that an overall coefficient of performance (COP) of 2 should be readily achieved. Values close to this have been realised with the first experimental prototype.
https://arrow.dit.ie/engschmecart/3
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A High Sensitivity, Evanescent Feld Refractometric Sensor Based on Tapered Multimode Fiber Interference
(2011)
Wang, Pengfei; Brambilla, Gilberto; Ding, Ming; Semenova, Yuliya; Wu, Qiang; Farrell, G...
A High Sensitivity, Evanescent Feld Refractometric Sensor Based on Tapered Multimode Fiber Interference
(2011)
Wang, Pengfei; Brambilla, Gilberto; Ding, Ming; Semenova, Yuliya; Wu, Qiang; Farrell, Gerald
Abstract:
We propose and experimentally demonstrate an enhanced evanescent field fiber refractometer based on a tapered multimode fiber sandwiched between two single-mode fibers. Experiments show that this fiber sensor offers ultrahigh sensitivity [better than 1900 nm/RIU at a refractive index (RI) of 1.44] for RI measurements within the range of 1.33–1.44 , in agreement with the theoretical predictions. This is the highest value reported to date (to our knowledge) in the literature.
https://arrow.dit.ie/engscheceart/116
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A High-Precision Apparatus for the Characterization of Thermal Interface Materials
(2009)
ROBINSON, ANTHONY
A High-Precision Apparatus for the Characterization of Thermal Interface Materials
(2009)
ROBINSON, ANTHONY
Abstract:
An apparatus has been designed and constructed to characterize thermal interface materials with unprecedented precision and sensitivity. The design of the apparatus is based upon a popular implementation of ASTM D5470 where well-characterized meter bars are used to extrapolate surface temperatures and measure heat flux through the sample under test. Measurements of thermal resistance, effective thermal conductivity, and electrical resistance can be made simultaneously as functions of pressure or sample thickness. This apparatus is unique in that it takes advantage of small, well-calibrated thermistors for precise temperature measurements 0.001 K and incorporates simultaneous measurement of electrical resistance of the sample. By employing precision thermometry, low heater powers and minimal temperature gradients are maintained through the meter bars, thereby reducing uncertainties due to heat leakage and changes in meter-bar thermal conductivity. Careful implementation of instrum...
http://hdl.handle.net/2262/39285
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A literature review of critical thinking in engineering education
(2019)
Ahern, Aoife; Dominguez, Caroline; McNally, Ciaran; O'Sullivan, John; Pedrosa, Dan...
A literature review of critical thinking in engineering education
(2019)
Ahern, Aoife; Dominguez, Caroline; McNally, Ciaran; O'Sullivan, John; Pedrosa, Daniela
Abstract:
Developing optimum solutions to engineering problems typically relies on structured and complex thought processes that require evaluation, interpretation and opinion. Well-developed critical thinking (CT) skills are essential for dealing with the multi-dimensional nature of these problems. CT in an engineering context is well reported in teaching and learning academic literature. However, much of this is framed within theoretical and conceptual frameworks. Practical approaches of how CT skills are best promoted in engineering curricula are less common. A state-of-art review of practical interventions that target the development of CT in engineering students is presented. The review draws on 25 selected peer-reviewed journal articles in established engineering databases and focusses on teaching strategies where their effects in promoting CT skills in students are measured. Considerable variability in the reviewed literature was apparent. CT interventions and strategies are often repo...
http://hdl.handle.net/10197/10715
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