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Full-Text Articles in Engineering

An Analysis Of The Barriers To And Drivers Of Green Public Procurement In Achieving A More Sustainable Construction Industry, Myles Keaveney, Paul Butler Mar 2104

An Analysis Of The Barriers To And Drivers Of Green Public Procurement In Achieving A More Sustainable Construction Industry, Myles Keaveney, Paul Butler

Conference papers

The public sector in Ireland possesses enormous purchasing power which has the strength to affect production and consumption trends in all market sectors. Environmental purchasing tools such as Green Public Procurement (GPP) are seen by many as the solution to greener purchasing decisions in order to obtain and maintain not only a more sustainable construction sector but also a more sustainable economy. The purpose of this research is to determine and examine the key barriers to and drivers of implementing GPP in public procurement departments in order to reduce the effect construction works have on the environment. There was limited ...


Distance-Based Cluster Head Election For Mobile Sensing, Ruairí De Fréin, Liam O'Farrell Dec 2018

Distance-Based Cluster Head Election For Mobile Sensing, Ruairí De Fréin, Liam O'Farrell

Conference papers

Energy-efficient, fair, stochastic leader-selection algorithms are designed for mobile sensing scenarios which adapt the sensing strategy depending on the mobile sensing topology. Methods for electing a cluster head are crucially important when optimizing the trade-off between the number of peer-to- peer interactions between mobiles and client-server interactions with a cloud-hosted application server. The battery-life of mobile devices is a crucial constraint facing application developers who are looking to use the convergence of mobile computing and cloud computing to perform environmental sensing. We exploit the mobile network topology, specifically the location of mobiles with respect to the gateway device, to stochastically ...


Evaluating Load Adjusted Learning Strategies For Client Service Levels Prediction From Cloud-Hosted Video Servers, Ruairí De Fréin, Obinna Izima, Mark Davis Dec 2018

Evaluating Load Adjusted Learning Strategies For Client Service Levels Prediction From Cloud-Hosted Video Servers, Ruairí De Fréin, Obinna Izima, Mark Davis

Conference papers

Network managers that succeed in improving the accuracy of client video service level predictions, where the video is deployed in a cloud infrastructure, will have the ability to deliver responsive, SLA-compliant service to their customers. Meeting up-time guarantees, achieving rapid first-call resolution, and minimizing time-to-recovery af- ter video service outages will maintain customer loyalty.

To date, regression-based models have been applied to generate these predictions for client machines using the kernel metrics of a server clus- ter. The effect of time-varying loads on cloud-hosted video servers, which arise due to dynamic user requests have not been leveraged to improve prediction ...


A Comparative Study Of Defeasible Argumentation And Non-Monotonic Fuzzy Reasoning For Elderly Survival Prediction Using Biomarkers, Lucas Rizzo, Ljiljana Majnaric, Luca Longo Nov 2018

A Comparative Study Of Defeasible Argumentation And Non-Monotonic Fuzzy Reasoning For Elderly Survival Prediction Using Biomarkers, Lucas Rizzo, Ljiljana Majnaric, Luca Longo

Conference papers

Computational argumentation has been gaining momentum as a solid theoretical research discipline for inference under uncertainty with incomplete and contradicting knowledge. However, its practical counterpart is underdeveloped, with a lack of studies focused on the investigation of its impact in real-world settings and with real knowledge. In this study, computational argumentation is compared against non-monotonic fuzzy reasoning and evaluated in the domain of biological markers for the prediction of mortality in an elderly population. Different non-monotonic argument-based models and fuzzy reasoning models have been designed using an extensive knowledge base gathered from an expert in the field. An analysis of ...


A Comparative Analysis Of Key Elements Of The Strategic Decision-Making Process Across Construction Professional Services Firms: Evidence From The Irish Construction Industry, Oluwasegun O. Seriki, Roisin Murphy Sep 2018

A Comparative Analysis Of Key Elements Of The Strategic Decision-Making Process Across Construction Professional Services Firms: Evidence From The Irish Construction Industry, Oluwasegun O. Seriki, Roisin Murphy

Conference papers

The Irish construction industry is experiencing a well-established growth phase following a prolonged recession. While the economic impact has been well documented, there remains less emphasis on discipline-specific studies pertaining to strategy within construction firms in Ireland. Additionally, evidence regarding strategic management within the construction sector is predominantly concentrated on contracting organisations, with less emphasis on highly knowledge-intensive professional service firms (PSFs). As the construction sector in Ireland continues its sustained growth, there have been increased calls within the industry for further collaboration between key stakeholders. However, exploring collaboration within project-centric firms without understanding the individual strategic decision-making processes within ...


The Role Of Digitisation In The Strategic Planning Process Of Irish Quantity Surveying(Qs) Practices, Michael Adesi, Roisin Murphy, Dermot Kehily Sep 2018

The Role Of Digitisation In The Strategic Planning Process Of Irish Quantity Surveying(Qs) Practices, Michael Adesi, Roisin Murphy, Dermot Kehily

Conference papers

Digitisation is important to the transformation of many aspects of the construction industry such as strategic planning process in QS practices. Quantity Surveying (QS) practices largely apply digital technologies in construction project delivery, while neglecting the use of digital technologies in the strategic planning process. The aim of this paper is to investigate the role of digitisation in the strategic planning process of QS practices operating in Ireland. The study adopts a quantitative research methodology which is the first phase of an ongoing research project, by administering survey questionnaires to senior management of QS practices in Ireland. The findings of ...


Introducing A New Cement Hydration And Microstructure Model, Niall Holmes, Anselm Griffin, Bernard Enright, Denis Keliher Aug 2018

Introducing A New Cement Hydration And Microstructure Model, Niall Holmes, Anselm Griffin, Bernard Enright, Denis Keliher

Conference papers

This paper presents a new cement hydration model to predict the microstructure evolution of hydrating tricalcium silicate (C3S). The model is written in MATLAB and employs the continuum approach and integrated particle kinetic relationships to show the change in C3S and the growth of Calcium Silicate Hydrate (C-S-H) and Calcium Hydroxide (CH) in the pore space over time.

Cement hydration is a highly complex process. While hydration models should never completely remove experimental analysis, they are an aid to better understand cement hydration and microstructure development by providing a method to analyse a large number of pastes with different cementitious ...


State Acquisition In Computer Networks, Ruairí De Fréin May 2018

State Acquisition In Computer Networks, Ruairí De Fréin

Conference papers

We establish that State Acquisition should be per- formed in networks at a rate which is consistent with the rate-of-change of the element or service being observed. We demonstrate that many existing monitoring and service-level prediction tools do not acquire network state in an appropriate manner. To address this challenge: (1) we define the rate-of- change of different applications; (2) we use methods for analysis of unevenly spaced time series, specifically, time series arising from video and voice applications, to estimate the rate-of-change of these services; and finally, (3) we demonstrate how to acquire network state accurately for a number ...


The Academic Perspective: A Study Of Academic Conceptions Of The Importance Of Professional Skills In Engineering Programmes In Ireland, Una Beagon May 2018

The Academic Perspective: A Study Of Academic Conceptions Of The Importance Of Professional Skills In Engineering Programmes In Ireland, Una Beagon

Conference papers

This presentation outlines a phenomenographic research study which aims to explore engineering academics experiences and conceptions towards developing professional skills within engineering students in Ireland. The research is undertaken in two phases. Phase One is an online survey circulated to academics teaching on engineering programmes in Ireland (n=273). Phase Two will consist of in-depth interviews.

The overall phenomenographic study aims to answer the research question;

  • What are the qualitatively different ways that academics experience and conceptualise teaching and the development of professional skills in engineering programmes in Ireland?


Social Contagion And Knowledge Acquisition In Construction Professional Service Firms, Oluwasegun O. Seriki, Roisin Murphy Apr 2018

Social Contagion And Knowledge Acquisition In Construction Professional Service Firms, Oluwasegun O. Seriki, Roisin Murphy

Conference papers

The construction industry in Ireland, including professional service firms (PSF’s) operating therein, are undergoing a period of change and uncertainty driven by economic, demographic, political and technological factors. While considerable evidence exists demonstrating the relationship between environmental turbulence on organisational decision making, there remains a distinct lack of focus on behavioural patterns affecting decision-making process of construction firms. Social contagion (SC) theory asserts that the spread of ideas, attitudes, or behaviour patterns in a group is achieved through imitation and conformity, and is well established within social sciences research, and is increasingly being used to analyse organisational behaviour. However ...


Information Technology (It) For Strategy Formulation In Irish Quantity Surveying Firms: A Literature Review, Michael Adesi, Roisin Murphy, Dermot Kehily Apr 2018

Information Technology (It) For Strategy Formulation In Irish Quantity Surveying Firms: A Literature Review, Michael Adesi, Roisin Murphy, Dermot Kehily

Conference papers

The purpose of this study is to provide a critical review of existing studies on strategy to demonstrate the influence of information technology on strategy formulation in quantity surveying practices in Ireland. The paper focuses on the influence of IT on the strategic planning and decision making process of QS practices in Ireland. A key finding from the study supports the potential to apply dynamic capability theory emanating from the Resource Based View (RBV) of the firm to construction Professional Service Firms (PSF’s) in Ireland. The framework presented in this paper has the potential for advancing future research agenda ...


Study Of Mm-Wave Microstrip Patch Array On Curved Substrate, Zeeshan Ahmed, Kansheng Yang, Patrick Mcevoy, Max Ammann Apr 2018

Study Of Mm-Wave Microstrip Patch Array On Curved Substrate, Zeeshan Ahmed, Kansheng Yang, Patrick Mcevoy, Max Ammann

Conference papers

A millimetre wave rectangular microstrip patch antenna array for fifth generation communications (5G) applications is presented. With the increase in demand for high data rates and capacity, there is a need to include mm-Wave frequencies for 5G. The 4×2 patch array is simulated and fabricated on a Rogers RT/Duroid 5880 substrate with a thickness of 0.25 mm. The effects of bending the substrate on the antenna performance are also presented. The experimental results show a fractional bandwidth and gain of more than 3% and 16.1 dBi, respectively.


Using Regular Languages To Explore The Representational Capacity Of Recurrent Neural Architectures, Abhijit Mahalunkar, John D. Kelleher Jan 2018

Using Regular Languages To Explore The Representational Capacity Of Recurrent Neural Architectures, Abhijit Mahalunkar, John D. Kelleher

Conference papers

The presence of Long Distance Dependencies (LDDs) in sequential data poses significant challenges for computational models. Various recurrent neural architectures have been designed to mitigate this issue. In order to test these state-of-the-art architectures, there is growing need for rich benchmarking datasets. However, one of the drawbacks of existing datasets is the lack of experimental control with regards to the presence and/or degree of LDDs. This lack of control limits the analysis of model performance in relation to the specific challenge posed by LDDs. One way to address this is to use synthetic data having the properties of subregular ...


Quantity Surveying Professional Apprenticeships: A Paragon For The Supply Of Talent In The Irish Construction Industry, Eoghan Ó Murchadha, Roisin Murphy Jan 2018

Quantity Surveying Professional Apprenticeships: A Paragon For The Supply Of Talent In The Irish Construction Industry, Eoghan Ó Murchadha, Roisin Murphy

Conference papers

The construction industry in Ireland has undergone considerable change in the last decade, the effect of which has resulted in a legacy malfunction in the construction labour market. The recent construction downturn led to high levels of construction unemployment, resulting in the mass emigration of construction professionals. Additionally, perceptions of job uncertainty in construction deterred new entrants into construction-related training and education programmes such as Quantity Surveying. If a skills gap is allowed to prevail, then there is a tangible threat to the industry’s cost competitiveness. As such, value for money becomes merely theoretical, and the cost to the ...


Quantity Surveying Professional Apprenticeships: A Paragon For The Supply Of Talent In The Irish Construction Industry, Eoghan Ó Murchadha, Roisin Murphy Jan 2018

Quantity Surveying Professional Apprenticeships: A Paragon For The Supply Of Talent In The Irish Construction Industry, Eoghan Ó Murchadha, Roisin Murphy

Conference papers

The construction industry in Ireland has undergone considerable change in the last decade, the effect of which has resulted in a legacy malfunction in the construction labour market. The recent construction downturn led to high levels of construction unemployment, resulting in the mass emigration of construction professionals. Additionally, perceptions of job uncertainty in construction deterred new entrants into construction-related training and education programmes such as Quantity Surveying. If a skills gap is allowed to prevail, then there is a tangible threat to the industry’s cost competitiveness. As such, value for money becomes merely theoretical, and the cost to the ...


Influence Of Cement Type On The Efficiency Of Electrochemical Chloride Extraction, Brian Norton, Sean Bond, Chahrazed Osmani, Niall Holmes Jan 2018

Influence Of Cement Type On The Efficiency Of Electrochemical Chloride Extraction, Brian Norton, Sean Bond, Chahrazed Osmani, Niall Holmes

Conference papers

No abstract provided.


The Acquisition Of Knowledge And Expertise In Construction: Understanding Construction Professionals, Lloyd Scott, Sittimont Kanjanabootra Jan 2018

The Acquisition Of Knowledge And Expertise In Construction: Understanding Construction Professionals, Lloyd Scott, Sittimont Kanjanabootra

Conference papers

Education programs these days especially in Construction Management have been designed and updated to response to market and stakeholder needs. However, there still exists a need for educators to understand how construction practitioners develop their expertise. Understanding the development of expertise is essential for providers of university education and training to enable them to develop programs to establish on which new professionals can better develop their appropriate expertise. This paper builds on earlier research and further explores how expertise develops in construction professionals. It also explores the similarities and differences in development of that expertise in construction practitioners from the ...


The Impact Of Brexit On Cross-Border Trade By The Construction Sector In Ireland: An Exploratory Study, Tara Brooks, Duga Ewuga, Lloyd Scott, John Spillane Jan 2018

The Impact Of Brexit On Cross-Border Trade By The Construction Sector In Ireland: An Exploratory Study, Tara Brooks, Duga Ewuga, Lloyd Scott, John Spillane

Conference papers

Cross-border co-operation can foster learning and contribute positively to business performance and social cohesion. This paper considers construction firms' economic motivation for co-operation around the Ireland - Northern Ireland border. This area, while impacted by the Brexit uncertainty, shares many of the economic and developmental characteristics of border areas throughout Europe. The purpose of the study is to investigate the impact of Brexit on cross border trade by the construction sector in Ireland and investigate the current tensions and barriers to that sector. A qualitative methodology adopted a literature review and semi-structured interview strategy. Data was collected from purposively selected contractors ...


Operation Of Three-Level Single-Phase Half-Bridge Npc Inverter-Based Shunt Active Power Filter Under Non-Ideal Grid Voltage Condition With Sliding Mode Controller, Samet Biricik, Hasan Komurcugil, Tuan Ngo, Malabika Basu Jan 2018

Operation Of Three-Level Single-Phase Half-Bridge Npc Inverter-Based Shunt Active Power Filter Under Non-Ideal Grid Voltage Condition With Sliding Mode Controller, Samet Biricik, Hasan Komurcugil, Tuan Ngo, Malabika Basu

Conference papers

In this paper, a new control method is presented for a single-phase three-level neutral point clamped half-bridge shunt active power filter with the aim of eliminating the grid current harmonics. It is shown that the proposed control me thod accurately detects the positive-sequence voltage component under distorted grid condition. With this feature, the performance of the single-phase active power filter under distorted grid voltage condition is improved considerably. Furthermore, the imbalance in the capacitor voltages which occurs in the half-bridge topology is eliminated by adding a feedback term to the current control loop.


Comparison Of Grid Array And Microstrip Patch Array Antennas At 28 Ghz, Zeeshan Ahmed, Patrick Mcevoy, Max Ammann Jan 2018

Comparison Of Grid Array And Microstrip Patch Array Antennas At 28 Ghz, Zeeshan Ahmed, Patrick Mcevoy, Max Ammann

Conference papers

A millimeter wave Grid Array Antenna for fifth generation (5G) communications is presented. The 20 cell, nearly-rhombic, 40×40 mm2 Grid Array Antenna structure is simulated and fabricated on a Rogers RT/Duroid 5880 substrate with thickness of 0.25 mm. The grid array has |S11|


A Review Of Multimode Interference In Tapered Optical Fibers And Related Applications, Pengfei Wang, Haiyan Zhao, Xianfan Wang, Gerald Farrell, Gilberto Brambilla Jan 2018

A Review Of Multimode Interference In Tapered Optical Fibers And Related Applications, Pengfei Wang, Haiyan Zhao, Xianfan Wang, Gerald Farrell, Gilberto Brambilla

Conference papers

In recent years, tapered optical fibers (TOFs) have attracted increasing interest and developed into a range of devices used in many practical applications ranging from optical communication, sensing to optical manipulation and high-Q resonators. Compared with conventional optical fibers, TOFs possess a range of unique features, such as large evanescent field, strong optical confinement, mechanical flexibility and compactness. In this review, we critically summarize the multimode interference in TOFs and some of its applications with a focus on our research project undertaken at the Optoelectronics Research Centre of the University of Southampton in the United Kingdom.


An Investigation Of Argumentation Theory For The Prediction Of Survival In Elderly Using Biomarkers, Lucas Middeldorf Rizzo, Ljiljana Majnaric, Pierpaolo Dondio, Luca Longo Jan 2018

An Investigation Of Argumentation Theory For The Prediction Of Survival In Elderly Using Biomarkers, Lucas Middeldorf Rizzo, Ljiljana Majnaric, Pierpaolo Dondio, Luca Longo

Conference papers

Research on the discovery, classification and validation of biological markers, or biomarkers, have grown extensively in the last decades. Newfound and correctly validated biomarkers have great potential as prognostic and diagnostic indicators, but present a complex relationship with pertinent endpoints such as survival or other diseases manifestations. This research proposes the use of computational argumentation theory as a starting point for the resolution of this problem for cases in which a large amount of data is unavailable. A knowledge-base containing 51 different biomarkers and their association with mortality risks in elderly was provided by a clinician. It was applied for ...


Is It Worth It? Budget-Related Evaluation Metrics For Model Selection, Filip Klubicka, Giancarlo Salton, John Kelleher Jan 2018

Is It Worth It? Budget-Related Evaluation Metrics For Model Selection, Filip Klubicka, Giancarlo Salton, John Kelleher

Conference papers

Projects that set out to create a linguistic resource often do so by using a machine learning model that pre-annotates or filters the content that goes through to a human annotator, before going into the final version of the resource. However, available budgets are often limited, and the amount of data that is available exceeds the amount of annotation that can be done. Thus, in order to optimize the benefit from the invested human work, we argue that the decision on which predictive model one should employ depends not only on generalized evaluation metrics, such as accuracy and F-score, but ...


On The Reliability, Validity And Sensitivity Of Three Mental Workload Assessment Techniques For The Evaluation Of Instructional Designs: A Case Study In A Third-Level Course, Luca Longo Jan 2018

On The Reliability, Validity And Sensitivity Of Three Mental Workload Assessment Techniques For The Evaluation Of Instructional Designs: A Case Study In A Third-Level Course, Luca Longo

Conference papers

Cognitive Load Theory (CLT) has been conceived for instructional designers eager to create instructional resources that are presented in a way that encourages the activities of the learners and optimise their performance, thus their learning. Although it has been researched for many years, it has been criticised because of its theoretical clarity and its methodological approach. In particular, one fundamental and open problem is the measurement of its cognitive load types and the measurement of the overall cognitive load of learners during learning tasks. This paper is aimed at investigating the reliability, validity and sensitivity of existing mental workload assessment ...


Application Of Improved Phase-Shifted Pulse Width Modulation With Third Harmonic Injection To Hybrid Modular Multi-Level Converter, Mohammad Mohsen Rahimian, Majid Hosseinpour, Malabika Basu, Michael Farrell, Shahab Sajedi Jan 2018

Application Of Improved Phase-Shifted Pulse Width Modulation With Third Harmonic Injection To Hybrid Modular Multi-Level Converter, Mohammad Mohsen Rahimian, Majid Hosseinpour, Malabika Basu, Michael Farrell, Shahab Sajedi

Conference papers

Hybrid modular multi-level converters (Hybrid-

MMCs) which are modular multi-level converters including full and half bridge sub-modules, are recently used in high-voltage direct current (HVDC) transmission systems. Compared to its non-hybrid counterpart, these converters have several advantages such as the ability to nullify the DC side fault current and controlling AC side reactive power during the faults. This paper proposes a novel modified phase shifted PWM method (PS-PWM) which uses a combination of an improved PS-PWM with cancelled mismatch pulses and a third harmonic injection method. The proposed method not only reduces output voltage harmonic content and uneven loss distribution ...


Power Loss Comparison Of Dc Side And Ac Side Cascaded Modular Multilevel Inverters, Shahab Sajedi, Malabika Basu, Michael Farrell Jan 2018

Power Loss Comparison Of Dc Side And Ac Side Cascaded Modular Multilevel Inverters, Shahab Sajedi, Malabika Basu, Michael Farrell

Conference papers

High-voltage DC (HVDC) transmission systems

based on voltage source converter technology are increasingly being used for interconnecting power networks and for transporting energy from remote renewable energy sources. Modular multilevel converters (MMCs) are emerging as the technology of choice for future HVDC transmission systems. Several MMC topologies have been introduced for high power applications and among them the AC side and the DC side cascaded topologies have received most interest because of their high efficiency, low switching losses and good modularity. In high power applications, the efficiency of the converter is an important consideration. Hence it is essential converter power ...


Interoperable Ocean Observing Using Archetypes: A Use-Case Based Evaluation, Paul Stacey, Damon Berry Jan 2018

Interoperable Ocean Observing Using Archetypes: A Use-Case Based Evaluation, Paul Stacey, Damon Berry

Conference papers

This paper presents a use-case based evaluation of the impact of two-level modeling on the automatic federation of ocean observational data. The goal of the work is to increase the interoperability and data quality of aggregated ocean observations to support convenient discovery and consumption by applications. An assessment of the interoperability of served data flows from publicly available ocean observing spatial data infrastructures was performed. Barriers to consumption of existing standards-compliant ocean-observing data streams were examined, including the impact of adherence to agreed data standards. Historical data flows were mapped to a set of archetypes and a backward integration experiment ...


The Potential For Power Quality Problem Mitigation Through Statcom, Arsalan Zaidi, Keith Sunderland, Michael Conlon Jan 2018

The Potential For Power Quality Problem Mitigation Through Statcom, Arsalan Zaidi, Keith Sunderland, Michael Conlon

Conference papers

Consideration of spatial and temporal diversity of EV charging demand has been demonstrated to reduce the estimating impacts on the distribution networks. The data formulation is based on impact studies of Electrical vehicles (EV s) on distribution networks. It is suggested that Distribution System Operator (DSO) could benefit for new innovation/advancement in the market (BESS-STATCOM) in a way that makes networks more reliable/robust, In this regard such innovation creates more opportunities for demand side management, reduces planning uncertainties associated with stochastic nature of EV charging and makes space for demand side management. This work considers probabilistic load flow ...


Review Of The Effectiveness Of Impulse Testing For The Evaluation Of Cable Insulation Quality And Recommendations For Quality Testing, Adrian Coughlan, Joseph Kearney, Tom Looby Jan 2018

Review Of The Effectiveness Of Impulse Testing For The Evaluation Of Cable Insulation Quality And Recommendations For Quality Testing, Adrian Coughlan, Joseph Kearney, Tom Looby

Conference papers

Abstract— This project investigates impulse breakdown testing as a means of determining the as constructed standard of MV power cable. A literature survey is undertaken to elucidate the place of this test in an overall cable test regime and to determine the factors that impact on the performance of the test method. Testing was undertaken on ESB Networks cables to establish if a merit order ranking was feasible based on this test and to determine if the test could detect defects in the inner semiconducting layer. Based on this, conclusions and recommendations are made regarding the overall applicability and usefulness ...


Assessment Of The Accuracy Of Cable Sheath Fault Location Device And Enhancement Of Its Performance, Niall Kennedy, Joseph Kearney, Tom Looby, Ciaran O'Leary Jan 2018

Assessment Of The Accuracy Of Cable Sheath Fault Location Device And Enhancement Of Its Performance, Niall Kennedy, Joseph Kearney, Tom Looby, Ciaran O'Leary

Conference papers

As power system networks are being constantly upgraded and extended, there is a greater importance in the reliable transmission of electrical power and fault finding techniques, especially for cables installed underground. Damage to a cable’s protective sheath can damage a cables life span and also lead to disruption of system operation and loss of supply. This study includes research into the literature and techniques used to locate these faults accurately. Bridge resistance and volt drop measurement techniques are the main methods used by sheath fault location devices to locate faults accurately. This task is made more difficult because such ...