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Displaying Results 226 - 250 of 1313 on page 10 of 53
Marked
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Simulation of nonlinear systems subject to modulated chirp signals
(2015)
Condon, Marissa; Iserles, Arieh
Simulation of nonlinear systems subject to modulated chirp signals
(2015)
Condon, Marissa; Iserles, Arieh
Abstract:
Purpose The purpose of the paper is to apply a novel technique for the simulation of nonlinear systems subject to modulated chirp signals. Design/methodology/approach The simulation technique is first described and its salient features are presented. Two examples are given to confirm the merits of the method. Findings The results indicate that the method is appropriate for simulating nonlinear systems subject to modulated chirp signals. In particular, the efficiency and accuracy of the method is seen to improve as the chirp frequency increases. In addition, error bounds are given for the method. Originality/value Chirp signals are employed in several important applications such as representing biological signals and in spread spectrum communications. Analysis of systems involving such signals requires accurate, appropriate and effective simulation techniques.
http://doras.dcu.ie/20733/
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Process diagnostics of industrial plasma systems
(2015)
MacGearailt, Niall
Process diagnostics of industrial plasma systems
(2015)
MacGearailt, Niall
Abstract:
This thesis presents new techniques to investigate and understand the source of process variability in plasma etching. In a semiconductor factory thousands of wafers are processed every month in multiple chambers. Whi le great effort is made to create reproducible process conditions, common and special cause variation remain a big challenge for the semiconductor industry. Process conditions are never identical from wafer to wafer and chamber to chamber. When high-frequency RF power, employed to create a plasma, is coupled into a chamber, the electrical characteristics of each chamber assembly is different. This electrical difference is as a result of mechanical differences of chamber components and how they are assembled. RF losses of the current affect the power deposition in the plasma and affect the process outcome. As each chamber processes more and more wafers, by-products buildup on the chamber walls impacting the process repeatability and influencing the processing chemistry....
http://doras.dcu.ie/20813/
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A multi-modal smart sensing network for marine environmental monitoring
(2015)
Zhang, Dian
A multi-modal smart sensing network for marine environmental monitoring
(2015)
Zhang, Dian
Abstract:
There is an imperative need for long-term, large-scale marine monitoring systems that will allow decisions to be made based on the analysis of collected data to avoid or limit negative impacts on the ecosystem. Modern marine environmental sensing technologies, such as autonomous wireless sensor networks (WSNs), provide the capability to meet the challenges of high spatial and temporal scales. However, the significant amount of data generated from WSNs is a significant challenge for manual analysis. These multitudinous data need to be automatically processed, indexed and catalogued in a smarter way that can be more easily understood, accessed and managed by operators, scientists and policy makers. Moreover, current research works show that WSNs have their own limitations, for example, reliability issues and the fact that they are passive systems and provide context-less data. Thus, it is becoming increasingly clear that in order to adequately monitor marine environments, they need to...
http://doras.dcu.ie/20802/
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High-capacity multicarrier electro-optical transceivers based on analogue signal processing
(2016)
Gutierrez, Fernando
High-capacity multicarrier electro-optical transceivers based on analogue signal processing
(2016)
Gutierrez, Fernando
Abstract:
Currently, the proliferation of services and applications based on the cloud and the Internet are translating into increasing demand for capacity in data networks. Optical Communications is the only technical field that can address this issue by providing higher performance electro-optical transceivers with enhanced spectral efficiency, power consumption and latency. Many research and implementation efforts are focusing on multicarrier solutions, often referred to as subcarrier multiplexing (SCM), as they are more tolerant to dispersion and allow a higher modulation order per subchannel. In recent years, the most widespread trend has developed SCM subsystems based on digital signal processing (DSP). They can achieve high spectral efficiencies with complicated algorithms, but also present an important drawback: intensive DSP brings about unwanted high-power consumption and high latency. An alternative consists of developing SCM systems based on analogue signal processing (ASP) as it...
http://doras.dcu.ie/21381/
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Investigating multi-modal features in the design of a multi-media hyperlinking framework
(2016)
Chen, Shu
Investigating multi-modal features in the design of a multi-media hyperlinking framework
(2016)
Chen, Shu
Abstract:
Search, as a well-known information retrieval strategy, is widely researched and developed for academic and commercial usage. However, in the context of increasing amounts of multimedia data, search alone cannot satisfy user requirements for exploring multimedia resources. Therefore, preprocessing of multimedia resources is necessary to define potentially related documents to reduce retrieval time and improve the browsing efficiency. Using hyperlinks to connect relevant resources is widely used for multimedia collection. However, the definition of hyperlinks is usually based on textual information. For example, hyperlinks in Wikipedia link a term to relevant webpages. By contrast, content based multimedia retrieval provides the possibility of analysing multimedia materials on the actual content. The availability of these technologies for multimedia search suggests further investigation of content-based hyperlinking for multimedia collections. This thesis is dedicated to a novel to...
http://doras.dcu.ie/21321/
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Design and evaluation of an energy efficient frequency adaptive router
(2017)
Guo, Feng
Design and evaluation of an energy efficient frequency adaptive router
(2017)
Guo, Feng
Abstract:
Energy efficiency is becoming a prominent issue in ICT networks. Many approaches have been proposed to reduce the power consumption of ICT network devices. Among those green approaches, dynamic frequency scaling (DFS) offers an elegant solution for improving the energy efficiency of processors. To evaluate the impact of different DFS techniques on energy efficiency of real network devices, this work designs a prototype of a novel energy-aware Frequency Adaptive Router (FAR) that dynamically scales the operating frequency of core logic FPGA processor among five different processing capacities in response to traffic load, rather than leaving the network devices running on its maximum processing capacity all the time. Three dynamic frequency adaptation control policies are introduced into the FAR to balance the trade-off between performance and power consumption. Based on statistics monitoring and preset thresholds, the proposed dynamic frequency adaptation control policies can manage...
http://doras.dcu.ie/21891/
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Improving user experience and energy efficiency for different classes of users in vehicular networks
(2016)
Tal, Irina
Improving user experience and energy efficiency for different classes of users in vehicular networks
(2016)
Tal, Irina
Abstract:
Lately, significant research efforts are put in the area of designing smart cities by both academia and industry focusing on making use of city facilities (buildings, infrastructure, transportation, energy, etc.) in order to improve people’s quality of life and create a sustainable environment. Vehicular ad hoc networks (VANET) play a main role in supporting the creation of smarter cities. VANET are based on “smart” inter-vehicle communications and with the infrastructure via so called V2X communications (i.e. V2V – vehicle-to-vehicle and V2I/I2V – vehicle-to-infrastructure/infrastructure-to-vehicle). V2X communications demonstrated their huge potential when designing not only intelligent transportation solutions, but also green transportation solutions. Most of the research in this area targets a single class of VANET users represented by the car drivers. This thesis addresses different types of users, mainly the cyclists, as cycling is one of the most sustainable and green forms o...
http://doras.dcu.ie/21016/
Marked
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Case study of an interdisciplinary problem-based engineering design course
(2008)
TORRANCE, ARCHIBALD ANDREW; WEST, ROGER PLUMER; O'KELLY, BRENDAN; BURKE, MARTIN J;...
Case study of an interdisciplinary problem-based engineering design course
(2008)
TORRANCE, ARCHIBALD ANDREW; WEST, ROGER PLUMER; O'KELLY, BRENDAN; BURKE, MARTIN J; BOLAND, FRANCIS MORGAN
Abstract:
This paper describes an interdisciplinary problem-based engineering design course taken by about 170 students in the second year of the Bachelor of Engineering degree program at Trinity College Dublin. The course runs throughout the academic year and consists of three projects, namely: the design and construction of a model railcar to safely carry freight in as short a time period as possible along a racecourse (mechanical); a bridge to support the rail track (civil) and a signaling system to control the movement of the railcar (electronic). Working groups of mixed ability are given written project specifications, timelines and submission deadlines. The projects, which have a plurality of solutions, serve as an engine for invention to assist the students in achieving a range of professional, transferable and social competences under the guidance of a team of professors and demonstrators. The motivation among the students is high and considerable enthusiasm and interaction is generat...
http://hdl.handle.net/2262/65746
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Evaluation of the microstructural, electronic and optoelectronic properties of ƴ-CuCl thin films and their fabrication on Si substrates
(2008)
Lucas, Francis Olabanji
Evaluation of the microstructural, electronic and optoelectronic properties of ƴ-CuCl thin films and their fabrication on Si substrates
(2008)
Lucas, Francis Olabanji
Abstract:
Cuprous chloride is a direct wide bandgap (Eg = ~ 3.4 eV) semiconductor with a large excitonic binding energy (~ 190 meV). In this study, CuCl has been deposited by the vacuum evaporation method on a variety of substrates (amorphous silica glass, indium tin oxide (ITO) coated on glass and Silicon (100)) substrates, encapsulated and characterized as a potential material for optoelectronic applications. Some of the samples were also oxygen plasma treated for durations of 1, 2 and 3 minutes, respectively. Room temperature x-ray diffraction (XRD) measurements show that CuCl grows preferentially in a (111) orientation irrespective of the underlying substrate. Microstructural properties of the films gave nearly the same values for untreated CuCl films deposited on glass, ITO and Si substrates (particle size, L = 9.6 nm ± 1 nm). On the other hand, the microstructural properties of the plasma treated films vary as a function of plasma treatment duration. At 10 K, the photoluminescence (PL) ...
http://doras.dcu.ie/159/
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Low cost angular displacement sensors for biomechanical applications - a review
(2014)
Szelitzky, Emőke; Kuklyte, Jogile; Mândru, Dan; O'Connor, Noel E.
Low cost angular displacement sensors for biomechanical applications - a review
(2014)
Szelitzky, Emőke; Kuklyte, Jogile; Mândru, Dan; O'Connor, Noel E.
Abstract:
In the general scientific quest for increased quality of life a natural ambition is to know more about human body kinematics. Varied knowledge can be extracted from sensors placed on human body and through associated biomechanical parameter evaluation the causal connection between different biomechanical parameters and medical conditions can be inferred. From a biomechanical point of view, one of the most important parameters within the human body is the amplitude of angular movements of joints. Although many angular sensors are used in industry, particular characteristics such as small size, flexibility and appropriate attachment methods must be taken into consideration when estimating the amplitude of movement of human joints. This paper reviews the existing low cost easy to manipulate angular sensors listed in the scientific literature, which currently are or could be used in rehabilitation engineering, physiotherapy or biomechanical evaluations in sport. The review is carried ou...
http://doras.dcu.ie/22012/
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Integrating Contour-Coupling with Spatio-Temporal Models in Multi-Dimensional Cardiac Image Segmentation
(2011)
O'Brien, Stephen
Integrating Contour-Coupling with Spatio-Temporal Models in Multi-Dimensional Cardiac Image Segmentation
(2011)
O'Brien, Stephen
http://doras.dcu.ie/16072/
Marked
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Optimizing energy-efficiency for multi-core packet processing systems in a compiler framework
(2012)
Huang, Jing
Optimizing energy-efficiency for multi-core packet processing systems in a compiler framework
(2012)
Huang, Jing
Abstract:
Network applications become increasingly computation-intensive and the amount of traffic soars unprecedentedly nowadays. Multi-core and multi-threaded techniques are thus widely employed in packet processing system to meet the changing requirement. However, the processing power cannot be fully utilized without a suitable programming environment. The compilation procedure is decisive for the quality of the code. It can largely determine the overall system performance in terms of packet throughput, individual packet latency, core utilization and energy efficiency. The thesis investigated compilation issues in networking domain first, particularly on energy consumption. And as a cornerstone for any compiler optimizations, a code analysis module for collecting program dependency is presented and incorporated into a compiler framework. With that dependency information, a strategy based on graph bi-partitioning and mapping is proposed to search for an optimal configuration in a parallel-...
http://doras.dcu.ie/17442/
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Enabling the Re-engineering of Material Purchasing in the Construction industry by the Effective Use of Information Technology
(2004)
Hore, Alan V; West, Roger
Enabling the Re-engineering of Material Purchasing in the Construction industry by the Effective Use of Information Technology
(2004)
Hore, Alan V; West, Roger
Abstract:
The current methods of ordering, delivering and invoicing of materials in the construction industry is enormously inefficient, with vast quantities of paperwork, duplication of effort, scanning, re-keying and resolving mismatches between invoices, delivery dockets and purchase orders. This paper sets out the results of a successful 2005 pilot project which achieved a three-way electronic match of the purchase order, delivery note and supplier invoice information. The paper goes on to describe the opportunities and challenges of introducing such a system in the Irish construction industry
https://arrow.dit.ie/beschreccon/14
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Integrated WEC System Optimisation – Achieving Balanced Technology Development and Economical Lifecycle Performance
(2011)
Weber, Jochem; Teillant, Boris; Costello, Ronan; Ringwood, John; Soulard, Thomas
Integrated WEC System Optimisation – Achieving Balanced Technology Development and Economical Lifecycle Performance
(2011)
Weber, Jochem; Teillant, Boris; Costello, Ronan; Ringwood, John; Soulard, Thomas
Abstract:
Successful development of economical wave energy converter (WEC) systems requires an integrated and balanced research technology development process and a thorough understanding of the economic performance criteria over the system lifecycle. Core performance attributes are associated with WEC concept, technology, operation and wavefarm economics and include survivability, power output, availability and cost. Both integrated system optimisation and successful research technology development routes require appropriate WEC system assessment tools. The paper describes the structure of an integrated techno-economic WEC system performance assessment framework. This comprises a WEC engineering analysis and a wavefarm lifecycle analysis. Both are presented in content and structure. Six core sub-models of the wavefarm lifecycle analysis are described and generic example results are provided. It is shown how the WEC system performance assessment framework provides a solid foundation for imple...
http://eprints.maynoothuniversity.ie/3552/
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Value-Chain Engineering of a Tower-Top Cellular Base Station System
(2007)
Cooper, Tim; Farrell, Ronan
Value-Chain Engineering of a Tower-Top Cellular Base Station System
(2007)
Cooper, Tim; Farrell, Ronan
Abstract:
In this paper we present a value chain analysis of mobile `phone basestations, with a focus on possible antenna based tower-top electronics. Through this analysis we are able to present a number of possible architectural solutions and provide guidance on performance and reliability criterion
http://eprints.maynoothuniversity.ie/2720/
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Underwater acoustics propagation analysis and modelling of sound emitting devices
(2017)
Ikpekha, Oshoke
Underwater acoustics propagation analysis and modelling of sound emitting devices
(2017)
Ikpekha, Oshoke
Abstract:
Electro-Mechanical devices such as Wave Energy Converters (WECs) are potentially an important technology for the generation of renewable ocean energy. These underwater Acoustic Emitting (AE) machines are liable to experience certain failure modes such as damaged bearings, hydraulic faults, electrical arcs, vibration, etc. during their operation. This can lead to catastrophic failure of components of an overall ocean based system if necessary preventative measures are not taken. It is important therefore to create a robust condition monitoring process of rapid detection and classification of faults in these machines, to reduce costs and increase lifetime and reliability. This will assist companies involved in the deployment of these systems, particularly companies involved in the renewable ocean energy and marine technology sectors, to improve on the operational and management costs of ocean based systems, specifically impacting on efficiency and yield, reliability, and maintenance c...
http://doras.dcu.ie/21719/
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Content delivery and challenges in education hybrid students
(2008)
Molloy, David
Content delivery and challenges in education hybrid students
(2008)
Molloy, David
Abstract:
Traditionally, taught postgraduate programmes placed students in well-defined categories such as 'distance learning' and 'on-campus' or 'part-time' and 'full-time'. The practical reality is that postgraduate students rarely fall into such simple, diametric roles and can be more suitably generalised under the concept of the 'hybrid student'. Hybrid students are dynamic, with changing requirements in relation to their education. They expect flexibility and the ability to make changes relating to module participation level, study mechanism and lecture attendance, in order to suit personal preference and circumstance. This paper briefly introduces the concept of the hybrid student and how the concept has been handled within the School of Electronic Engineering at DCU. Following this, some discussion is provided in relation to a number of the content delivery technologies used in programmes facilitating these students: HTML, PowerPoint, M...
http://doras.dcu.ie/2187/
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Investigation of semi-solid metal processing route
(2005)
Ali Shah, Mian Wajid
Investigation of semi-solid metal processing route
(2005)
Ali Shah, Mian Wajid
Abstract:
Two main objectives were complete during this work. One was the design and construction of a high temperature capillary viscometer and the second was the modelling of semi-solid metal flow with a view to aiding the design and providing data for comparison purposes. The high temperature capilla ry viscometer has been constructed and has been used for preliminary testing. This device will be used to measure the viscosity of semi-solid metals under high temperature and shear rate conditions, similar to those found in industry. The capillary viscometer is a single point system that can be used to calculate the v isco s ity b y measuring the flow rate and pressure difference between the two end o f the capillary tube as the v isco s ity directly proportional to the pressure drop and inversely proportional to the flow rate. Design criteria included a requirement for a highly controllable temperature up to 800 °C, injection shear rates above 10 ,0 0 0 s '1, and controllable injection ...
http://doras.dcu.ie/17356/
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Load management systems for component-based middleware
(2004)
Ciuhandu, Petre Octavian
Load management systems for component-based middleware
(2004)
Ciuhandu, Petre Octavian
Abstract:
This thesis proposes a new approach to the design of reflective load management services for middleware, tackling the main problems in existing load management services. The system is designed using a modular architecture. The two key benefits of the approach are th a t modules can be dynamically activated and deactivated as required, enabling the minimisation of the overhead introduced by the system, and th a t new modules with enhanced functionality can easily (and dynamically) be introduced into the system. The system comprises of a load monitoring module, a load prediction module, a load evaluation module and a load distribution module. Each module has a clearly defined role in the system and a well defined interface. The load evaluation module offers the possibility of dynamically changing the distribution algorithm. The modularity of the system is further extended to the monitoring, workload prediction and load distribution components, so that new monitors and algorithms can ...
http://doras.dcu.ie/17376/
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Automation of painted slate inspection
(2002)
Carew, Tim
Automation of painted slate inspection
(2002)
Carew, Tim
Abstract:
This thesis is concerned with the problem of how to detect visual defects on painted slates using an automated visual inspection system. The vision system that has been developed consists of two major components. The first component addresses issues such as the mechanical implementation and interfacing the inspection system with the optical and sensing equipment whereas the second component involves the development of an image processing algorithm able to identify the visual defects present on the slate surface. The visual defects can be roughly classified into two distinct categories. In this way, substrate faults occur when the slate is not fully formed or has excess material whilst paint faults describe a slate of uneven colour or gloss level. A key element in successfully imaging the slate surface defects is the illumination set-up. After extensive testing, an effective collimated lighting topology was selected and is described in detail. Imaging the slate surface was challengi...
http://doras.dcu.ie/17430/
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Virtual learning process environment (VLPE): a BPM-based learning process management architecture
(2013)
Adesina, Ayodeji
Virtual learning process environment (VLPE): a BPM-based learning process management architecture
(2013)
Adesina, Ayodeji
Abstract:
E-learning systems have significantly impacted the way that learning takes place within universities, particularly in providing self-learning support and flexibility of course delivery. Virtual Learning Environments help facilitate the management of educational courses for students, in particular by assisting course designers and thriving in the management of the learning itself. Current literature has shown that pedagogical modelling and learning process management facilitation are inadequate. In particular, quantitative information on the process of learning that is needed to perform real time or reflective monitoring and statistical analysis of students’ learning processes performance is deficient. Therefore, for a course designer, pedagogical evaluation and reform decisions can be difficult. This thesis presents an alternative e-learning systems architecture - Virtual Learning Process Environment (VLPE) - that uses the Business Process Management (BPM) conceptual framework to design a...
http://doras.dcu.ie/17711/
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Ease: a real-time multitasking executive
(1996)
Doyle, David
Ease: a real-time multitasking executive
(1996)
Doyle, David
Abstract:
Ease the real time multitasking executive described m this thesis is designed for embedded systems with particular emphasis on DSP motor control applications. Ease provides an application software interface to the underlying hardware and encourages an object oriented programming approach which inherently enhances software integrity, maintainability and dependability in the potentially chaotic real time environment. Its focus is to tackle the undesirable aspects of real time programming and device dependent issues thereby allowing the application programmer to concentrate more on the application. The multitasking aspect of the executive means application tasks can be generated with ease which aids development, evolution or enhancement of an application. The multitasking aspect also facilitates tasks dedicated to on-line reconfiguration, error handling and fault correction or shutdown procedures. The software quality of a real time application running on the Ease platform is paid f...
http://doras.dcu.ie/18531/
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A configurer for parallel programs
(1991)
Karabash, Nasser Suleiman
A configurer for parallel programs
(1991)
Karabash, Nasser Suleiman
Abstract:
Making parallel systems easy to use, and parallel programs easy to write and run, are two major aims for parallel systems designers. This work describes an automatic configurer which attempts to lessen the effort a user should put to configure and run a parallel program on a network of parallel processors. The configurer configures the program, as required by the operating system and produces the configured source of the program. The network is also configured by the configurer to meet the communication requirements of the configured program
http://doras.dcu.ie/19156/
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The effects of powder processing parameters on the microstructure and energy absorption characteristics of low voltage ZnO varistors
(1995)
McArdle, Damian Michael
The effects of powder processing parameters on the microstructure and energy absorption characteristics of low voltage ZnO varistors
(1995)
McArdle, Damian Michael
Abstract:
The effect of comminution techniques used during the powder preparation stage of zinc oxide varistor powder was studied. The continual requirement for downsizing in electronic components combined with improved performance, demand greater understanding of the parameters influencing the required characteristics. Improvements in energy absorption capability of low voltage zinc oxide varistors are highly desirable from both a commercial and end product performance perspective. Enhanced energy absorption capability can be used to upgrade the rating of an existing varistor form factor capable of suppressing larger transients (Product capability enhancement) or alternatively reducing the part dimensions (Cost improvements). Current commercial applications for zinc oxide varistors demand energy performance improvements especially in automotive and telecommunications applications, where dimensions and costs as well as high reliability are imperative to compete in the world marketplace. Th...
http://doras.dcu.ie/18998/
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Computationally Tractable Location Estimation on WiFi Enabled Mobile Phones
(2009)
Kelly, Damian; Behan, Ross; Villing, Rudi; McLoone, Sean F.
Computationally Tractable Location Estimation on WiFi Enabled Mobile Phones
(2009)
Kelly, Damian; Behan, Ross; Villing, Rudi; McLoone, Sean F.
Abstract:
Enriching a mobile device with the ability to detect its location can enable the provision of a range of Location Based Services to its user. Outdoors, the location detection facility is sufficiently provided by GPS, however GPS is not suited to the challenge of non-line-of-sight indoor environments. In these environments smaller scale location estimation techniques must be employed. Due to their ubiquity, WiFi signals are a commonly employed indicator of location; knowledge of the identity and intensity of these signals throughout an environment can allow the estimation of the receiving device’s location. This paper outlines work towards the development of efficient, privacy conservative positioning algorithms suitable for deployment on commonly available mobile phones. For a number of algorithms, the frequency of correct location prediction is presented along with the execution time on a real mobile phone.
http://eprints.maynoothuniversity.ie/2490/
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