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Displaying Results 151 - 175 of 9230 on page 7 of 370
Marked
Mark
Homogenisation of temperature and precipitation time series with ACMANT3: method description and efficiency tests
(2017)
Coll, John
Homogenisation of temperature and precipitation time series with ACMANT3: method description and efficiency tests
(2017)
Coll, John
Abstract:
The development of Adapted Caussinus–Mestre Algorithm for homogenising Networks of Temperature series (ACMANT), one of the most successful homogenisation methods tested by the European project COST ES0601 (HOME) has been continued. The third generation of the software package ‘ACMANT3’ contains six programmes for homogenising temperature values or precipitation totals. These incorporate two models of the annual cycle of temperature biases and homogenisation either on a monthly or daily time scale. All ACMANT3 programmes are fully automatic and the method is therefore suitable for homogenising large datasets. This paper describes the theoretical background of ACMANT and the recent developments, which extend the capabilities, and hence, the application of the method. The most important novelties in ACMANT3 are: the ensemble pre-homogenisation with the exclusion of one potential reference composite in each ensemble member; the use of ordinary kriging for weighting reference composites;...
http://eprints.maynoothuniversity.ie/8728/
Marked
Mark
Holistic features for real-time crowd behaviour anomaly detection
(2016)
Marsden, Mark; McGuinness, Kevin; Little, Suzanne; O'Connor, Noel E.
Holistic features for real-time crowd behaviour anomaly detection
(2016)
Marsden, Mark; McGuinness, Kevin; Little, Suzanne; O'Connor, Noel E.
Abstract:
This paper presents a new approach to crowd behaviour anomaly detection that uses a set of efficiently computed, easily interpretable, scene-level holistic features. This low-dimensional descriptor combines two features from the literature: crowd collectiveness [1] and crowd conflict [2], with two newly developed crowd features: mean motion speed and a new formulation of crowd density. Two different anomaly detection approaches are investigated using these features. When only normal training data is available we use a Gaussian Mixture Model (GMM) for outlier detection. When both normal and abnormal training data is available we use a Support Vector Machine (SVM) for binary classification. We evaluate on two crowd behaviour anomaly detection datasets, achieving both state-of-the-art classification performance on the violent-flows dataset [3] as well as better than real-time processing performance (40 frames per second).
http://doras.dcu.ie/21786/
Marked
Mark
Real-time PCR methods for the detection of blown pack spoilage causing Clostridium species; C. estertheticum, C. gasigenes and C. ruminantium
(2017)
Reid, Rachael; Burgess, Catherine M.; McCabe, Evonne; Fanning, Séamus; Whyte, Paul; Ker...
Real-time PCR methods for the detection of blown pack spoilage causing Clostridium species; C. estertheticum, C. gasigenes and C. ruminantium
(2017)
Reid, Rachael; Burgess, Catherine M.; McCabe, Evonne; Fanning, Séamus; Whyte, Paul; Kerry, Joseph P.; Bolton, Declan
Abstract:
A set of real-time PCR methods for the detection of C. estertheticum, C. gasigenes and C. ruminantium, the causative agents of blown pack spoilage (BPS) in vacuum packaged beef, was developed. Robust validation of the sensitivity and specificity was carried out in the three matrices (beef meat drip, wet environmental swabs and dry environmental swabs) as encountered in our testing laboratory and against Clostridium strains (n = 76) and non-Clostridium strains (n = 36). It was possible to detect 4–5 spores per ml for C. estertheticum, 2 spores per ml for C. gasigenes and 8 spores per ml for C. ruminantium, without the need for enrichment of the samples. This high sensitivity is particularly important for the beef sector, not just for testing spoiled product but also in the early detection of contaminated beef and in validation of sporicidal cleaning procedures for critical pieces of equipment such as the vacuum packaging machine, which have the potential to contaminate large volumes ...
http://hdl.handle.net/10468/4631
Marked
Mark
Using Rugby MSF broadcast for time division multiplexing synchronisation in a housing community sensor network
(2006)
Maloco, John; McLoone, Seamus; Delaney, Declan
Using Rugby MSF broadcast for time division multiplexing synchronisation in a housing community sensor network
(2006)
Maloco, John; McLoone, Seamus; Delaney, Declan
Abstract:
This paper presents the design of a new approach to networking a housing community, through the use of a mesh sensor network that consists of both wireless infrastructural mesh nodes and wireless sensor nodes. One key issue with such networks is the development of a suitable medium access control (MAC) protocol for the purpose of transferring data from the sensor nodes to the infrastructural nodes. Here, we use a MAC protocol based on time division multiplexing (TDM) and propose the use of the Rugby MSF broadcast as a synchronisation signal. This novel technique is investigated and some preliminary analysis is outlined.
http://eprints.maynoothuniversity.ie/8774/
Marked
Mark
Process Dynamic Modelling Using Continuous Time Local Model Networks
(1998)
McLoone, Seamus; Irwin, George W.
Process Dynamic Modelling Using Continuous Time Local Model Networks
(1998)
McLoone, Seamus; Irwin, George W.
Abstract:
The capabilities of the continuous-time Local Model (LM) network for representing a non-linear dynamic process are studied by simulation of a coupled tank system. The paper shows how normalisation of the network weighting functions limits the modelling accuracy and proposes a solution via the addition of constant bias terms to each of the individual local models.
http://eprints.maynoothuniversity.ie/8786/
Marked
Mark
Time series momentum: theory and practice
(2017)
O'Brien, John
Time series momentum: theory and practice
(2017)
O'Brien, John
Abstract:
Time series momentum (TSM) is a significant component of many investment strategies, both explicitly and implicitly. While academic studies have confirmed long run excess return, other aspects of the strategy have received less attention. This research focuses on performance variations across economic conditions and on the return drivers of TSM and associated investment funds. The performance record is extend back to 1925, confirming long run performance and providing a large sample to analyse its relationship with economic conditions, with a number of links demonstrated. TSM underperforms for periods of up to four years immediately after financial crises, with returns at less than half the level of normal periods. A breakdown in market structure is associated with this. Serial auto-correlation of asset returns, found in all markets at horizons of up to twelve months, is absent in the years following a crisis. Further evidence links the strategy to the business cycle, demonstrating ...
http://hdl.handle.net/10468/5699
Marked
Mark
A Real-time Framework for Video Time and Pitch Scale Modification
(2008)
Damnjanovic, Ivan; Barry, Dan; Dorran, David; Reiss, Josh
A Real-time Framework for Video Time and Pitch Scale Modification
(2008)
Damnjanovic, Ivan; Barry, Dan; Dorran, David; Reiss, Josh
Abstract:
A framework is presented which addresses the issues related to the real-time implementation of synchronised video and audio time-scale and pitch-scale modification algorithms. It allows for seamless real-time transition between continually varying, independent time-scale and pitch-scale parameters arising as a result of manual or automatic intervention. We illuminate the problems which arise in a real-time context as well as provide novel solutions to prevent artefacts, minimise latency, and improve synchronisation. The time and pitch scaling approach is based on a modified phase vocoder with optional phase locking and an integrated transient detector which enables high quality transient preservation in real-time. A novel method for audio/visual synchronisation was implemented in order to ensure no perceptible latency between audio and video while real-time time scaling and pitch shifting is applied. Evaluation results are reported which demonstrate both high audio quality and minim...
https://arrow.dit.ie/argcon/47
Marked
Mark
Time-scale Modification of Music using a Synchronized Subband/Time-domain Approach
(2004)
Dorran, David; Lawlor, Robert
Time-scale Modification of Music using a Synchronized Subband/Time-domain Approach
(2004)
Dorran, David; Lawlor, Robert
Abstract:
Time-domain audio time-scaling algorithms are efficient in comparison to their frequency-domain counterparts, but they rely upon the existence of a quasi-periodic signal to produce a high quality output. This requirement makes them unsuitable for direct application to complex multi-pitched signals such as polyphonic music. However, it has been shown that applying time-domain algorithms on a subband basis can resolve this issue. Existing subband/time domain approaches result in a reverberant/phasy artifact being introduced into the output due to poor synchronization between time-scaled subbands. This paper presents a number of synchronization schemes that greatly reduce the amount of reverberation/phasiness introduced into the time-scaled output by existing subband/time domain approach.
https://arrow.dit.ie/argcon/24
Marked
Mark
Roo: A framework for real-time threads.
(1995)
CAHILL, VINNY
Roo: A framework for real-time threads.
(1995)
CAHILL, VINNY
Abstract:
Traditional object-oriented real-time systems are often limited an that they provide only one approach to real-time object support. Taking the increasing demand for flexible and extensible object support environments into account, we discuss the design and implementation of a small object-oriented real-time executive based on a sub-framework which we call Roo. Roo is a component of the Tigger framework (our proposal for an extensible object support operating system) and is intended to support different object models providing soft real-time behaviour. Roo provides support for different mechanisms and policies for real-time thread management, scheduling and synchronization. In this it serves as a basis for other components of the Tigger framework
http://hdl.handle.net/2262/32727
Marked
Mark
Is the shell-focusing singularity of Szekeres space-time visible?
(2007)
Nolan, Brien C.; Debnath, Ujjal
Is the shell-focusing singularity of Szekeres space-time visible?
(2007)
Nolan, Brien C.; Debnath, Ujjal
Abstract:
The visibility of the shell-focusing singularity in Szekeres space-time—which represents quasispherical dust collapse—has been studied on numerous occasions in the context of the cosmic censorship conjecture. The various results derived have assumed that there exist radial null geodesics in the space-time. We show that such geodesics do not exist in general, and so previous results on the visibility of the singularity are not generally valid. More precisely, we show that the existence of a radial geodesic in Szekeres space-time implies that the space-time is axially symmetric, with the geodesic along the polar direction (i.e. along the axis of symmetry). If there is a second nonparallel radial geodesic, then the space-time is spherically symmetric, and so is a Lemaître-Tolman-Bondi space-time. For the case of the polar geodesic in an axially symmetric Szekeres space-time, we give conditions on the free functions (i.e. initial data) of the space-time which lead to visibility of the s...
http://doras.dcu.ie/15642/
Marked
Mark
A Comparison of Time-domain Time-scale Modification Algorithms
(2006)
Dorran, David; Lawlor, Robert; Coyle, Eugene
A Comparison of Time-domain Time-scale Modification Algorithms
(2006)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Abstract:
Time-domain appraoches to time-scale modification are popular due to their ability to produce high quality results at a relatively low computational cost. Within the category of time-domain implementations quite a number of alternatives exist, each with their own computational requirements and associated output quality. This paper provides a computational and objective output quality assessment of a number of popular time-domain time-scaling implmentations; thus providing a means for developers to identify a suitable algorithm for their application of interest. In addition, the issues that should be considered in developing time-domain algorithms are outlines, purely in the context of a waveform editing procedure.
https://arrow.dit.ie/argcon/64
Marked
Mark
Achieving real-time guarantees in mobile wireless ad hoc networks.
(2003)
CAHILL, VINNY
Achieving real-time guarantees in mobile wireless ad hoc networks.
(2003)
CAHILL, VINNY
Abstract:
Timely wireless communication is essential to allow real-time mobile applications, such as communication between mobile robots or inter-vehicle communication to be realized. The real-time event-based communication paradigm has been recognized as an appropriate highlevel communication scheme to connect autonomous components in large distributed control systems [1]. We investigate whether real-time event constraints can be guaranteed in a mobile ad hoc wireless network. In this work in progress paper we present our analysis of the impact of mobile ad hoc wireless networks on achieving real-time guarantees. We introduce our ongoing work on the use of a proactive routing and resource reservation protocol using mobility awareness and prediction to reduce the unpredictability of a dynamic mobile ad hoc wireless network.
http://hdl.handle.net/2262/32771
Marked
Mark
Audio Time-scale Modification using a Hybrid Time-frequency Domain Approach
(2005)
Dorran, David; Coyle, Eugene; Lawlor, Robert
Audio Time-scale Modification using a Hybrid Time-frequency Domain Approach
(2005)
Dorran, David; Coyle, Eugene; Lawlor, Robert
Abstract:
Frequency-domain approaches to audio time-scale modification introduce a reverberant artefact into the time-scaled output due to a loss in phase coherence between subband components. Whilst techniques have been developed which reduce the presence of this artifact, it remains a source of difficulty. A method of time-scaling is presented that reduces the presence of the reverberation by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence along frequency-domain subband components. The approach makes use of appealing aspects of existing time-domain and frequency-domain time-scaling techniques.
https://arrow.dit.ie/argcon/14
Marked
Mark
Towards real-time middleware for applications of vehicular ad hoc networks.
(2005)
MEIER, RENE; CAHILL, VINNY
Towards real-time middleware for applications of vehicular ad hoc networks.
(2005)
MEIER, RENE; CAHILL, VINNY
Abstract:
Applications of inter-vehicle and vehicle-to-roadside communication that make use of vehicular ad hoc networks (VANETs) will often require reliable communication that provides guaranteed real-time message propagation. This paper describes an event-based middleware, called RT-STEAM. Unlike other event systems, RT-STEAM does not rely on a centralized event broker or look-up service while still supporting event channels providing hard real-time event delivery. RT-STEAM event filtering can be based on subject, content and/or proximity. To guarantee real-time communication, we exploit proximitybased event propagation to guarantee real-time constraints within the defined proximities only. The proximity within which realtime guarantees are available is adapted to maintain time bounds while allowing changes to membership and topology, typical of VANETs. This Space-Elastic Model of real-time communication is the first to directly address adaptation in the space domain to guarantee real-time ...
http://hdl.handle.net/2262/32667
Marked
Mark
An Evaluation of Aspect-Oriented Programming for Java-based Real-Time Systems Development
(2004)
CLARKE, SIOBHAN
An Evaluation of Aspect-Oriented Programming for Java-based Real-Time Systems Development
(2004)
CLARKE, SIOBHAN
Abstract:
Some concerns, such as debugging or logging functionality, cannot be captured cleanly, and are often tangled and scattered throughout the code base. These concerns are called crosscutting concerns. Aspect- Oriented Programming (AOP) is a paradigm that enables developers to capture crosscutting concerns in separate aspect modules. The use of aspects has been shown to improve understandability and maintainability of systems. It has been shown that real-time concerns, such as memory management and thread scheduling, are crosscutting concerns [5, 6, 9, 11]. However it is unclear whether encapsulating these concerns provides benefits. We were interested in determining whether using AOP to encapsulate real-time crosscutting concerns afforded benefits in system properties such as understandability and maintainability. This paper presents research comparing the system properties of two systems: a real-time sentient traffic simulator and its Aspect- Oriented equivalent. An evaluation of AOP ...
http://hdl.handle.net/2262/38855
Marked
Mark
Chronigami: Folding and unfolding Time
(1995)
Kavanagh, Donncha; Araujo, Luis
Chronigami: Folding and unfolding Time
(1995)
Kavanagh, Donncha; Araujo, Luis
Abstract:
Time is a construct or variable that is fundamental to a variety of theories of organizational change and strategic planning, as well as numerous mid-range models such as the product life cycle. In virtually all of these models, time is assumed to be unproblematic, independent, 'out there', and unilinear; time follows its own arrow. In contrast, a long standing tradition of research in the social sciences points out that time is socially constructed and that in any society a repertoire of chronological codes is employed. This paper seeks to build on the constructivist understanding of time by presenting a multi-layered view of time and by attempting to illustrate the processes through which time is constructed. In doing so, it draws heavily on actor-network theory with its emphasis on the heterogeneous processes involved in the construction of nature and society. This use of actor-network theory is illustrated with field material from a longitudinal, ethnographic study of ...
http://hdl.handle.net/10197/5821
Marked
Mark
Estimation of the parameters of a delayed process using open loop time domain techniques
(1999)
Stolfa, Morena; O'Dwyer, Aidan
Estimation of the parameters of a delayed process using open loop time domain techniques
(1999)
Stolfa, Morena; O'Dwyer, Aidan
Abstract:
In this paper, we present three different approaches to fit the experimental data of a process with time delay in the time domain. Two of the proposed methods are based on the step response, and the third is based on the pulse response. The effectiveness of these techniques is verified by simulation results and by real-time experimental data. Only first order lag plus time delay models are considered in this paper.
https://arrow.dit.ie/engscheleart/88
Marked
Mark
Time and Pitch Scale Modification: a Real-time Framework and Tutorial
(2008)
Barry, Dan; Dorran, David; Coyle, Eugene
Time and Pitch Scale Modification: a Real-time Framework and Tutorial
(2008)
Barry, Dan; Dorran, David; Coyle, Eugene
Abstract:
A framework is presented which is designed to address the issues related to the real-time implementation of time-scale and pitch scale modification algorithms. This framework can be used as the basis for the developments of applications which allow for a seamless real-time transition between continually varying time scale and pitch-scale parameters which arise as a result of manual or automatic intervention.
https://arrow.dit.ie/argcon/16
Marked
Mark
An Efficient Phasiness Reduction Technique for Moderate Audio Time-scale Modification
(2004)
Dorran, David; Coyle, Eugene; Lawlor, Robert
An Efficient Phasiness Reduction Technique for Moderate Audio Time-scale Modification
(2004)
Dorran, David; Coyle, Eugene; Lawlor, Robert
Abstract:
Phase vocoder approaches to time-scale modification of audio introduce a reverberant/phasy artifact into the time-scaled output due to a loss in phase coherence between short-time Fourier transform (STFT) bins. Recent improvements to the phase vocoder have reduced the presence of this artifact, however, it remains a problem. A method of time-scaling is presented that results in a further reduction in phasiness, for moderate time-scale factors by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence between related STFT bins. Furthermore, the approach leads to a reduction in computational load within the range of time-scaling factors for which phasiness is reduced.
https://arrow.dit.ie/argcon/25
Marked
Mark
Sentiment analysis and real-time microblog search
(2012)
Bermingham, Adam
Sentiment analysis and real-time microblog search
(2012)
Bermingham, Adam
Abstract:
This thesis sets out to examine the role played by sentiment in real-time microblog search. The recent prominence of the real-time web is proving both challenging and disruptive for a number of areas of research, notably information retrieval and web data mining. User-generated content on the real-time web is perhaps best epitomised by content on microblogging platforms, such as Twitter. Given the substantial quantity of microblog posts that may be relevant to a user query at a given point in time, automated methods are required to enable users to sift through this information. As an area of research reaching maturity, sentiment analysis offers a promising direction for modelling the text content in microblog streams. In this thesis we review the real-time web as a new area of focus for sentiment analysis, with a specific focus on microblogging. We propose a system and method for evaluating the effect of sentiment on perceived search quality in real-time microblog search scenarios. ...
http://doras.dcu.ie/16748/
Marked
Mark
An evaluation of aspect-oriented programming for Java-based real-time systems development
(2004)
CLARKE, SIOBHAN
An evaluation of aspect-oriented programming for Java-based real-time systems development
(2004)
CLARKE, SIOBHAN
Abstract:
Some concerns, such as debugging or logging functionality, cannot be captured cleanly, and are often tangled and scattered throughout the code base. These concerns are called crosscutting concerns. Aspect-oriented programming (AOP) is a paradigm that enables developers to capture crosscutting concerns in separate aspect modules. The use of aspects has been shown to improve understandability and maintainability of systems. It has been shown that real-time concerns, such as memory management and thread scheduling, are crosscutting concerns [A. Corsaro et al., (2002), M.Deters et al., (2001), A. Gal et al., (2002)]. However it is unclear whether encapsulating these concerns provides benefits. We were interested in determining whether using AOP to encapsulate real-time crosscutting concerns afforded benefits in system properties such as understandability and maintainability. This paper presents research comparing the system properties of two systems: a real-time sentient traffic simulat...
http://hdl.handle.net/2262/16483
Marked
Mark
Towards real-time event-based communication in mobile ad hoc wireless networks.
(2003)
CAHILL, VINNY
Towards real-time event-based communication in mobile ad hoc wireless networks.
(2003)
CAHILL, VINNY
Abstract:
Most previous work on real-time event-based communication has assumed infrastructure-based networks. The underlying assumption of this work is that application components are stationary and that a fixed network infrastructure exists to facilitate communication between them [1]. Ad hoc wireless networks comprise sets of mobile nodes connected by wireless links that form arbitrary wireless network topologies without the use of any centralized access point. Ad hoc wireless networks are inherently self-creating, selforganizing and self-administering [2]. Such highly mobile, dynamic networks do not satisfy the design assumptions for previous real-time event-based communication.
http://hdl.handle.net/2262/32786
Marked
Mark
The Unfolding of the Relational Operant: A Real-time Analysis Using Electroencephalography and Reaction Time Measures
(2004)
Roche, Bryan; Linehan, Conor; Ward, Tomas E.; Dymond, Simon; Rehfeldt, Ruth-Anne
The Unfolding of the Relational Operant: A Real-time Analysis Using Electroencephalography and Reaction Time Measures
(2004)
Roche, Bryan; Linehan, Conor; Ward, Tomas E.; Dymond, Simon; Rehfeldt, Ruth-Anne
Abstract:
The current study attempted to capture in real time the unfolding of the relational operant using electroencephalography (EEG) and reaction time measures. Participants were exposed to relational pretraining to establish the contextual cues of Same and Opposite for two arbitrary stimuli. These cues were then used to establish a series of contextually controlled discriminations in order to create a simple relational network among a series of arbitrary stimuli. During the test for derived relations of Same and Opposite, EEG and reaction time measures were recorded for each individual test task during the acquisition of a stable derived relational response pattern. Participants were then exposed to an identical set of relational training and testing tasks with the important difference that an entirely different set of stimuli was used. EEG and reaction time measures were again recorded during the relational test phase. Results showed that reaction times decreased for all subjects across...
http://eprints.maynoothuniversity.ie/418/
Marked
Mark
Consequences of varied soil hydraulic and meteorological complexity on unsaturated zone time lag estimates.
(2014)
Vero, S.E.; Healy, Mark G.
Consequences of varied soil hydraulic and meteorological complexity on unsaturated zone time lag estimates.
(2014)
Vero, S.E.; Healy, Mark G.
Abstract:
Journal article
The true efficacy of a programme of agricultural mitigation measures within a catchment to improve water quality can be determined only after a certain hydrologic time lag period (subsequent to implementation) has elapsed. As the biophysical response to policy is not synchronous, accurate estimates of total time lag (unsaturated and saturated) become critical to manage the expectations of policy makers. The estimation of the vertical unsaturated zone component of time lag is vital as it indicates early trends (initial breakthrough), bulk (centre of mass) and total (Exit) travel times. Typically, estimation of time lag through the unsaturated zone is poor, due to the lack of site specific soil physical data, or by assuming saturated conditions. Numerical models (e.g. Hydrus 1D) enable estimates of time lag with varied levels of input data. The current study examines the consequences of varied soil hydraulic and meteorological complexity on unsaturated zone time la...
http://hdl.handle.net/10379/4670
Marked
Mark
Time divided - Time united? Temporal aspects of German unification
(2013)
Rau, Henrike
Time divided - Time united? Temporal aspects of German unification
(2013)
Rau, Henrike
Abstract:
To illuminate the persisting division between East and West Germany, this article explores temporal aspects of East German culture and their impact on German unification. Arguing that approaches to GDR time in the contemporary literature border on oversimplification, the article focuses on different layers of time in East Germany. It also deals with possible time-related sources of conflict between East and West Germans, such as contradictory temporal work practices. On the basis of ethnographic and documentary evidence, the article argues that ordinary members of the German public may be more subtly aware of clashes in time cultures than this literature suggests.
http://hdl.handle.net/10379/3507
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