Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

2017

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 3301 - 3330 of 8353

Full-Text Articles in Engineering

Iii-Nitride Nanowire Light-Emitting Diodes: Design And Characterization, Dipayan Datta Choudhary May 2017

Iii-Nitride Nanowire Light-Emitting Diodes: Design And Characterization, Dipayan Datta Choudhary

Theses

III-nitride semiconductors have been intensively studied for optoelectronic devices, due to the superb advantages offered by this materials system. The direct energy bandgap III-nitride semiconductors can absorb or emit light efficiently over a broad spectrum, ranging from 0.65 eV (InN) to 6.4 eV (AlN), which encompasses from deep ultraviolet to near infrared spectrum. However, due to the lack of native substrates, conventional III-nitride planar heterostructures generally exhibit very high dislocation densities that severely limit the device performance and reliability. On the other hand, nanowire heterostructures can be grown on lattice mismatched substrates with drastically reduced dislocation densities, due to highly …

Go to article

Experimental Study Of Bubble Rupture During Shock-Fluid Interaction, Subhalakshmi Chandrasekaran May 2017

Experimental Study Of Bubble Rupture During Shock-Fluid Interaction, Subhalakshmi Chandrasekaran

Theses

Head injuries are associated with exposure to high energy explosive detonation. There are four distinct types of blast induced neurotrauma (BINT): 1) these caused by supersonic shock waves propagating in the atmosphere (primary), 2) high velocity impact of shrapnel and debris (secondary) 3) acceleration and deceleration of the body and collision with the solid objects in the field (tertiary) and 4) exposure to high temperature and toxic gases (quaternary). One of the mechanisms implicated in non-impact primary blast-induced traumatic brain injury (bTBI) is cavitation. It is hypothesized that cavitation can occur in the cerebrospinal fluid (CSF) layer, brain interstitial fluid, …

Go to article

Multi-Population-Based Differential Evolution Algorithm For Optimization Problems, Ishani Chatterjee May 2017

Multi-Population-Based Differential Evolution Algorithm For Optimization Problems, Ishani Chatterjee

Theses

A differential evolution (DE) algorithm is an evolutionary algorithm for optimization problems over a continuous domain. To solve high dimensional global optimization problems, this work investigates the performance of differential evolution algorithms under a multi-population strategy. The original DE algorithm generates an initial set of suitable solutions. The multi-population strategy divides the set into several subsets. These subsets evolve independently and connect with each other according to the DE algorithm. This helps in preserving the diversity of the initial set. Furthermore, a comparison of combination of different mutation techniques on several optimization algorithms is studied to verify their performance. Finally, …

Go to article

Nanocomposite Thermite Powders With Improved Flowability Prepared By Mechanical Milling, Ci Huang May 2017

Nanocomposite Thermite Powders With Improved Flowability Prepared By Mechanical Milling, Ci Huang

Theses

Nanocomposite thermite powders are of interest to develop varieties of reactive parts and components. Manufacturing these components requires tailoring properties of the thermite powders such as their particle size distributions, particle shapes, and powder flowability. For example, an improved flowability is desired to use these powders as feedstock in additive manufacturing. Arrested reactive milling (ARM) offers a versatile and practical approach for preparing various nanocomposite thermites with fully dense particles, which will retain their structures and mixedness between reactive components while being stored, handled, and processed. However, ARM products usually have broad particle size distributions, rock-like particle shapes, and poor …

Go to article

Field Oriented Control Of Permanent Magnet Synchronous Motor With Third-Harmonic Injection Pulse Width Modulation To Reduce Quadrotors’ Speed Ripples, Yuxi Shi May 2017

Field Oriented Control Of Permanent Magnet Synchronous Motor With Third-Harmonic Injection Pulse Width Modulation To Reduce Quadrotors’ Speed Ripples, Yuxi Shi

Theses

The world’s commercial unmanned aerial vehicle (UAV) industry has witnessed unprecedented boom in recent years. Delighted with an ample supply of this excellent high-tech product, global consumers are paying more attention on UAVs. Civilian UAVs now vastly outnumber military ones, with the estimate of over a million sold by 2016. An UAV has various degrees of autonomy as enabled by the use and precise control of motors. Traditional Direct Current (DC) motors are replaced by permanent magnet synchronous motors (PMSM) associated with the new power electronic inverters. Because of a PMSM’s higher power density than a DC motor, it reduces …

Go to article

Smart Polymeric Temperature Sensors – For Biological Systems, Greenee Anilkumar Sinha May 2017

Smart Polymeric Temperature Sensors – For Biological Systems, Greenee Anilkumar Sinha

Theses

The damaged brain is vulnerable to increase in brain temperature after a severe head injury. Continuous monitoring of intracranial temperature depicts functionality essential to the treatment of brain injury Many innovations have been made in the biomedical industry relying on electronic implants in treating condition such as traumatic brain injury (TBI) or other cerebral diseases. Hence, a methodical and reliable way to measure the temperature is crucial to assess the patient’s situation. In this investigation, an analysis of various approaches to detect the change in the temperature due to resistance, current-voltage characteristics with respect to time has been evaluated. Also, …

Go to article

A Fuzzy Logic-Based Text Classification Method For Social Media, Keyuan Wu May 2017

A Fuzzy Logic-Based Text Classification Method For Social Media, Keyuan Wu

Theses

Social media offer abundant information for studying people’s behaviors, emotions and opinions during the evolution of various rare events such as natural disasters. It is useful to analyze the correlation between social media and human-affected events. This study uses Hurricane Sandy 2012 related Twitter text data to conduct information extraction and text classification. Considering that the original data contains different topics, we need to find the data related to Hurricane Sandy. A fuzzy logic-based approach is introduced to solve the problem of text classification. Inputs used in the proposed fuzzy logic-based model are multiple useful features extracted from each Twitter’s …

Go to article

Power Dissipation And Power Correlations For A Retreatblade Impeller Under Different Baffling Conditions, Chadakarn Sirasitthichoke May 2017

Power Dissipation And Power Correlations For A Retreatblade Impeller Under Different Baffling Conditions, Chadakarn Sirasitthichoke

Theses

Glass-lined stirred reactors and tanks are commonly used in the pharmaceutical industry because of their corrosion resistance, ease of cleanliness and minimization of product contamination. Most industrial glass-lined tank reactors are provided with a torispherical tank bottom and a retreat curve impeller with low impeller clearance from the vessel bottom. The power, P, dissipated by the impeller is a critical process parameter to mixing processes to achieve the desired mixing effect, especially since the power per unit volume, P/V, directly controls mass transfer processes and other mixing phenomena. However, little information has been published about the power dissipation and the …

Go to article

Profiling The Neurovascular Cell Interactions In Alcohol Exposure And Hiv-1 Infection, Agnieszka Agas May 2017

Profiling The Neurovascular Cell Interactions In Alcohol Exposure And Hiv-1 Infection, Agnieszka Agas

Theses

Alcohol use is known to exacerbate the progression of human immunodeficiency virus associated acquired immunodeficiency syndrome or HIV/AIDS in the brain, known as the NeuroAIDS. The mechanisms of this accelerated progression are still poorly understood. The purpose of my thesis is to review the parameters contributing to the co-morbid effects of alcohol in the progression of NeuroAIDS. The first aim will evaluate the exacerbating effects of alcohol on HIV-1 transmission, infection, and the role of metabolic energy imbalance during NeuroAIDS progression, which will enable me to formulate the possible mechanism for NeuroAIDS progression. The second aim will help me establish …

Go to article

Measurement Of Finger Coordination During A Motor Learning Task, Robert Ebel May 2017

Measurement Of Finger Coordination During A Motor Learning Task, Robert Ebel

Theses

The focus of this study is to observe the changes in whole hand grasp strategy, in healthy subjects, over time in a series of isometric force control learning tasks. During a series of trials with real-time visual feedback of the five finger forces, subjects adapted their grasp strategy in order to reach the target in a time efficient manner. In early trials, it is very evident that subjects focus on controlling the force output of one finger at a time until they reach the goal. As the block of trials progresses, subjects alter their strategy to a more coordinated movement …

Go to article

Decision Tree Rule-Based Feature Selection For Imbalanced Data, Haoyue Liu May 2017

Decision Tree Rule-Based Feature Selection For Imbalanced Data, Haoyue Liu

Theses

A class imbalance problem appears in many real world applications, e.g., fault diagnosis, text categorization and fraud detection. When dealing with an imbalanced dataset, feature selection becomes an important issue. To address it, this work proposes a feature selection method that is based on a decision tree rule and weighted Gini index. The effectiveness of the proposed methods is verified by classifying a dataset from Santander Bank and two datasets from UCI machine learning repository. The results show that our methods can achieve higher Area Under the Curve (AUC) and F-measure. We also compare them with filter-based feature selection approaches, …

Go to article

Corrosion Studies Of Stainless Steel Blades, Dhruv S. Kothari May 2017

Corrosion Studies Of Stainless Steel Blades, Dhruv S. Kothari

Theses

Corrosion is a subject of interest to interdisciplinary research communities that includes fields of materials science, chemistry, physics, metallurgy and chemical engineering. In order to understand the mechanisms of corrosion and the function of corrosion inhibitors, the reactions at the interfaces between the corrosive electrolyte and a steel surface, particularly at the initial stages of the corrosion process, need to be described. Naturally, these reactions are strongly affected by the nature and properties of the steel surfaces. It is however seen that the majority of recent corrosion and corrosion-inhibition investigations are limited to electrochemical testing, with ex situ analysis of …

Go to article

Investigation Of Nh3 And No Adsorption Over Cu/Sapo-34 And Cu/Aloo3 Catalysts For Nh3–Scr System, Basil Rawah May 2017

Investigation Of Nh3 And No Adsorption Over Cu/Sapo-34 And Cu/Aloo3 Catalysts For Nh3–Scr System, Basil Rawah

Theses

In this study, Copper supported on SAPO-34 molecular sieves or alumina is prepared via an incipient wetness impregnation method for ammonia selective catalytic reduction (NH3-SCR). These NH3-SCR catalysts are characterized by pulse chemisorption, temperature-programmed reduction (TPR), and temperature-programmed desorption (TPD) with three different conditions (NH3, NO, combined NH3-NO) to evaluate the adsorption of ammonia and nitric oxide. Cu/SAPO-34 catalyst has shown higher ammonia adsorption capacity compared to Cu/Al2O3 catalyst. The Cu/SAPO-34 adsorption is enhanced due to the strong acidity and high surface area of SAPO-34 molecular sieves. NO adsorption …

Go to article

Measuring The Reflection Matrix Of A Rough Surface, Kenneth W. Burgi, Michael A. Marciniak, Mark E. Oxley, Stephen E. Nauyoks May 2017

Measuring The Reflection Matrix Of A Rough Surface, Kenneth W. Burgi, Michael A. Marciniak, Mark E. Oxley, Stephen E. Nauyoks

Faculty Publications

Phase modulation methods for imaging around corners with reflectively scattered light required illumination of the occluded scene with a light source either in the scene or with direct line of sight to the scene. The RM (reflection matrix) allows control and refocusing of light after reflection, which could provide a means of illuminating an occluded scene without access or line of sight. Two optical arrangements, one focal-plane, the other an imaging system, were used to measure the RM of five different rough-surface reflectors. Intensity enhancement values of up to 24 were achieved. Surface roughness, correlation length, and slope were examined …

Go to article

Adaptive Screen Generation For Mobile Devices, Caoimhín O’Nualláin, Sam Redfern May 2017

Adaptive Screen Generation For Mobile Devices, Caoimhín O’Nualláin, Sam Redfern

The ITB Journal

When one looks at any learning software - eLearning based or not - one cannot sometims help but think why the authors could not have organized the screens (or the means of navigation) in a way similar to some other piece of software which the user has used or come accustomed to using. In this paper it is hoped to be able to achieve just that. That is, to accommodate the adaptive screen design by building up a profile about the user which can capture the learning styles of the user and personal preferences, and to be able to have …

Go to article

Voice Activated Command And Control With Speech Recognition Over Wireless Networks, Tony Ayres, Brian Nolan May 2017

Voice Activated Command And Control With Speech Recognition Over Wireless Networks, Tony Ayres, Brian Nolan

The ITB Journal

This paper presents work conducted to date on the development of a voice activated command and control framework specifically for the control of remote devices in a ubiquitous computing environment. The prototype device is a Java controlled Lego Mindstorm robot. The research considers three different scenario configurations. A recognition grammar for command and control of the robot has been created and implemented in Java, in part in the recognition engine and in part on the robot. The physical topology involves Java at each node endpoint, that is, at the handheld PC (iPaq), the PC workstation, the Linux server and onboard …

Go to article

Statistical Language Models For Graphical Object Recognition, Laura Keyes, Andrew O'Sullivan, Adam Winstanley May 2017

Statistical Language Models For Graphical Object Recognition, Laura Keyes, Andrew O'Sullivan, Adam Winstanley

The ITB Journal

This paper explores automatic recognition and semantic capture in vector graphics for graphical information systems. The low-level graphical content of graphical documents, such as a map or architectural drawing, are often captured manually and the encoding of the semantic content seen as an extension of this. The large quantity of new and archived graphical data available on paper makes automatic structuring of such graphical data desirable. A successful method for recognising text data uses statistical language models. This work will investigate and evaluate similar and adapted statistical models (Statistical Graphical Langauge Models, SGLM) to graphical languages based on the associations …

Go to article

Interactive 2d And 3d Graphics Over The World-Wide Web With Actionscript, Hugh Mccabe May 2017

Interactive 2d And 3d Graphics Over The World-Wide Web With Actionscript, Hugh Mccabe

The ITB Journal

Many efforts have been made to provide a mechanism for delivering interactive 3D content over the World-Wide Web. The majority of the solutions put forward require the use of a proprietary plug-in on the client browser and none of these required plug-ins have so far become part of the standard browser installation package. The Macromedia Flash player has however achieved near ubiquitous status as the standard plug-in for displaying interactive multimedia and graphics content. Flash does not provide native support for 3D graphics but the recent addition of the Shape Drawing API opens up the possibility of developers using ActionScript …

Go to article

Voice Enabled Indoor Localisation, Kieran Harkin, Kevin Curran, Eoghan Furey May 2017

Voice Enabled Indoor Localisation, Kieran Harkin, Kevin Curran, Eoghan Furey

The ITB Journal

The ability to track objects in real time offers a wide range of beneficial applications that include safety, security and the supply chain. The problem with location based systems is that they can be inconvenient and time-consuming to locate an object. A user has to access a computer and log onto a location system to locate an object. There are several problems with current location determination interfaces. Firstly a user has to log on to a computer; this can be inconvenient and time consuming as the user may have to locate a computer (which may be in another area of …

Go to article

Mobile Phone Game Localisation, Leonie Troy, Matt Smith, Richard Gallery May 2017

Mobile Phone Game Localisation, Leonie Troy, Matt Smith, Richard Gallery

The ITB Journal

Often, mobile phone games are developed over a short time span. Because of the additional work and complexity that localisation requires, such games are frequently produced without localisation in mind. In recent years automation and standardisation of localisation has been developed and promoted by the Localisation Industry Standard Association (LISA) and Oasis. Mobile phone game localisation involves various types of language transfer on a small scale, which challenges the localisation process carried out on a game. Our work investigated the workflow for the localisation of a mobile phone game into Spanish and German using a LISA Standard TMX (Term Base …

Go to article

Development Of An Enhanced Generic Data Mining Life Cycle (Dmlc), Markus Hofmann, Brendan Tierney May 2017

Development Of An Enhanced Generic Data Mining Life Cycle (Dmlc), Markus Hofmann, Brendan Tierney

The ITB Journal

Data mining projects are complex and have a high failure rate. In order to improve project management and success rates of such projects a life cycle is vital to the overall success of the project. This paper reports on a research project that was concerned with the life cycle development for large scale data mining projects. The paper provides a detailed view of the design and development of a generic data mining life cycle called DMLC. The life cycle aims to support all members of data mining project teams as well as IT managers and academic researchers and may improve …

Go to article

Is Your Wireless Network Being Hacked?, Paul King, Ivan Smyth, Anthony Keane May 2017

Is Your Wireless Network Being Hacked?, Paul King, Ivan Smyth, Anthony Keane

The ITB Journal

Wireless networks provide vulnerable gateways for unauthorised entry to networks or even a standalone wireless computer. The independent radio signals that constitute wireless communications have no physical boundary to keep them in check. This allows a third party to easily eavesdrop on communications sessions and by capturing the data packets, they can break the encryption keys and access the data within the network. The public awareness of the insecurity of wireless networks is surprisingly poor despite frequent news media reports of the vulnerabilities of the equipment and the activities of the criminals prepare to exploit it. In this paper we …

Go to article

Towards Arabic To English Machine Translation, Yasser Salem, Arnold Hensman, Brian Nolan May 2017

Towards Arabic To English Machine Translation, Yasser Salem, Arnold Hensman, Brian Nolan

The ITB Journal

This paper explores how the characteristics of the Arabic language will effect the development of a Machine Translation (MT) tool from Arabic to English. Several distinguishing features of Arabic pertinent to MT will be explored in detail with reference to some potential difficulties that they might present. The paper will conclude with a proposed model incorporating the Role and Reference Grammar (RRG) technique to achieve this end.

Go to article

Vertical Search Engines, Kevin Curran, Jude Mc Glinchey May 2017

Vertical Search Engines, Kevin Curran, Jude Mc Glinchey

The ITB Journal

This paper outlines the growth in popularity of vertical search engines, their origins, the differences between them and well-known broad based search engines such as Google and Yahoo. We also discuss their use in business-to-business, their marketing and advertising costs, what the revenue streams are and who uses them.

Go to article

Be Aware With A Honeypot, Stephen Meyer, Ivan Smyth, Mark Cummins, Anthony Keane May 2017

Be Aware With A Honeypot, Stephen Meyer, Ivan Smyth, Mark Cummins, Anthony Keane

The ITB Journal

The Internet has already become a hostile environment for computers, especially when they are directly connected with a public IP address. We have experienced this hostile activity where on an average day; the ITB Honeypot recorded over a thousand reconnaissance attacks seeking unauthorised entry onto our private network. Our Honeypot is a basic PC running Windows XP with no services offered and no activity from users that would generate traffic. The Honeypot is running in a passive state on a stub-network where all inbound and outbound traffic is recorded at the bridging computer to the WAN. We report on the …

Go to article

Using Extended Analogy To Teach Fundamental Computing Concepts, Damian Gordon May 2017

Using Extended Analogy To Teach Fundamental Computing Concepts, Damian Gordon

The ITB Journal

Using analogies has long been used to help explain complex ideas in teaching. One of the most important ideas that a computing student must understand is the basic architecture of a digital computer. Since the late 1960s the standard teaching approach used to explain computer architecture is the Little Man Computer (LMC) Paradigm. This research seeks to expand upon this standard explanation through the use of a relatively recently developed technique called Extended Analogy. Extended analogy seeks to combine regular analogy with exaggeration or dramatic emphasis. In this case the LMC paradigm is extended by use of Samuel Beckett's play …

Go to article

A Survey Of Procedural Techniques For City Generation, George Kelly, Hugh Mccabe May 2017

A Survey Of Procedural Techniques For City Generation, George Kelly, Hugh Mccabe

The ITB Journal

The computer game industry requires a skilled workforce and this combined with the complexity of modern games, means that production costs are extremely high. One of the most time consuming aspects is the creation of game geometry, the virtual world which the players inhabit. Procedural techniques have been used within computer graphics to create natural textures, simulate special effects and generate complex natural models including trees and waterfalls. It is these procedural techniques that we intend to harness to generate geometry and textures suitable for a game situated in an urban environment. Procedural techniques can provide many benefits for computer …

Go to article

Rapid-Prototyping Emulation System For Embedded System Hardware Verification, Using A Systemc Control System Environment And Reconfigurable Multimedia Hardware Development Platform, Dave Carroll, Richard Gallery May 2017

Rapid-Prototyping Emulation System For Embedded System Hardware Verification, Using A Systemc Control System Environment And Reconfigurable Multimedia Hardware Development Platform, Dave Carroll, Richard Gallery

The ITB Journal

This paper describes research into the suitability of using SystemC for rapid prototyping of embedded systems. SystemC[1][2][3] communication interface protocols [4][5] are interfaced with a reconfigurable hardware system platform to provide a real-time emulation environment, allowing SystemC simulations to be directly translated into real-time solutions. The consequent Rapid Prototyping Emulation System Platform1, suitable for the implementation of consumer level multimedia systems, is described, including the system architecture, SystemC Controller model, the FPGA configured MicroBlaze CPU system and additional logic devices implemented on the Multimedia development board used for the hardware in the PESP, illustrated in the context of a typical …

Go to article

Soc Test: Trends And Recent Standards, Michael Higgins, Ciaran Macnamee May 2017

Soc Test: Trends And Recent Standards, Michael Higgins, Ciaran Macnamee

The ITB Journal

The well-known approaching test cost crisis, where semiconductor test costs begin to approach or exceed manufacturing costs has led test engineers to apply new solutions to the problem of testing System-On-Chip (SoC) designs containing multiple IP (Intellectual Property) cores. While it is not yet possible to apply generic test architectures to an IP core within a SoC, the emergence of a number of similar approaches, and the release of new industry standards, such as IEEE 1500 and IEEE 1450.6, may begin to change this situation. This paper looks at these standards and at some techniques currently used by SoC test …

Go to article

Review Of Assistive Devices For Electric Powered Wheelchairs Navigation, K. Arshak, D. Buckley, K. Kaneswaran May 2017

Review Of Assistive Devices For Electric Powered Wheelchairs Navigation, K. Arshak, D. Buckley, K. Kaneswaran

The ITB Journal

The decreasing costs of microprocessor systems and increasing range of “Smart Sensors” have led to a boom in Assistive Device Technology. The annual rate of expenditure for mobility related devices has reached $1 billion dollars in the United States alone. The industries current focus is to develop a wider range of Independent Mobility Controllers to allow, even the most severely disabled person, the ability to control an Electric Powered Wheelchair (EPW). Advances in Autonomous Robot Design have led to corresponding improvements in EPW technology. This paper outlines user interfaces and input device technologies used at present to navigate an EPW.

Go to article

First Prev Next Last