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Displaying Results 11801 - 11825 of 11848 on page 473 of 474
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Concurrent Robin Hood Hashing
(2018)
Kelly, Robert; Pearlmutter, Barak A.; Maguire, Phil
Concurrent Robin Hood Hashing
(2018)
Kelly, Robert; Pearlmutter, Barak A.; Maguire, Phil
Abstract:
In this paper we examine the issues involved in adding concurrency to the Robin Hood hash table algorithm. We present a non-blocking obstruction-free K-CAS Robin Hood algorithm which requires only a single word compare-and-swap primitive, thus making it highly portable. The implementation maintains the attractive properties of the original Robin Hood structure, such as a low expected probe length, capability to operate effectively under a high load factor and good cache locality, all of which are essential for high performance on modern computer architectures. We compare our data structures to various other lock-free and concurrent algorithms, as well as a simple hardware transactional variant, and show that our implementation performs better across a number of contexts.
http://mural.maynoothuniversity.ie/14238/
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Joint association of urinary sodium and potassium excretion with cardiovascular events and mortality: prospective cohort study
(2021)
O’Donnell, Martin; Mente, Andrew; Rangarajan, Sumathy; McQueen, Matthew J.; O’Leary, Ne...
Joint association of urinary sodium and potassium excretion with cardiovascular events and mortality: prospective cohort study
(2021)
O’Donnell, Martin; Mente, Andrew; Rangarajan, Sumathy; McQueen, Matthew J.; O’Leary, Neil; Yin, Lu; Liu, Xiaoyun; Swaminathan, Sumathi; Khatib, Rasha; Rosengren, Annika; Ferguson, John; Smyth, Andrew; PURE Investigators
Abstract:
Abstract Objective To evaluate the joint association of sodium and potassium urinary excretion (as surrogate measures of intake) with cardiovascular events and mortality, in the context of current World Health Organization recommendations for daily intake (<2.0 g sodium, >3.5 g potassium) in adults. Design International prospective cohort study. Setting 18 high, middle, and low income countries, sampled from urban and rural communities. Participants 103 570 people who provided morning fasting urine samples. Main outcome measures Association of estimated 24 hour urinary sodium and potassium excretion (surrogates for intake) with all cause mortality and major cardiovascular events, using multivariable Cox regression. A six category variable for joint sodium and potassium was generated: sodium excretion (low (<3 g/day), moderate (3-5 g/day), and high (>5 g/day) sodium intakes) by potassium excretion (greater/equal or less than median 2.1 g/day). Results Mean estimated ...
http://hdl.handle.net/10379/16617
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Study of Natural Radioactivity Levels and Radon/Thoron Release Potential of Bedrock and Soil in Southeastern Ireland
(2021)
Crowley, Quentin
Study of Natural Radioactivity Levels and Radon/Thoron Release Potential of Bedrock and Soil in Southeastern Ireland
(2021)
Crowley, Quentin
Abstract:
Radon (222Rn) and thoron (220Rn) account for almost two-thirds of the annual average radiation dose received by the Irish population. A detailed study of natural radioactivity levels and radon and thoron exhalation rates was carried out in a legislatively designated ?high radon? area, as based on existing indoor radon measurements. Indoor radon concentrations, airborne radiometric data and stream sediment geochemistry were collated, and a set of soil samples were taken from the study area. The exhalation rates of radon (E222Rn) and thoron (E220Rn) for collected samples were determined in the laboratory. The resultant data were classified based on geological and soil type parameters. Geological boundaries were found to be robust classifiers for radon exhalation rates and radon-related variables, whilst soil type classification better differentiates thoron exhalation rates and correlated variables. Linear models were developed to predict the radon and thoron exhalation rates of the st...
http://hdl.handle.net/2262/95825
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State-business relations and the politics of state aid in the European Union: a multi-method approach to explaining aid allocations among member states
(2021)
Schito, Marco
State-business relations and the politics of state aid in the European Union: a multi-method approach to explaining aid allocations among member states
(2021)
Schito, Marco
Abstract:
This thesis investigates state aid allocations in the European Union (EU) member states to answer two key research questions about the political management of a market economy. Today, government officials cannot be indifferent to business performance. When direct management of the economy is not feasible, the government's role is to induce business to perform well. One way to do so is through the allocation of targeted subsidies to firms. However, not all countries support domestic producers to the same extent. Thus, the first research question it seeks to answer is: why do some national governments grant more state aid than others? In Chapter 2, I argue that political actors' incentives depend on the broad configuration of domestic and international political-economic institutions and structures, which interact to shape economic outcomes. My argument hinges on the two key words of responsiveness and accountability. With the former, I want to highlight the use of subsidie...
http://hdl.handle.net/2262/95808
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A school-based randomized controlled trial to promote cycling to school in adolescents: The PACO study
(2021)
Chillón, Palma; Gálvez-Fernández, Patricia; Huertas-Delgado, Francisco Javier; Herrador...
A school-based randomized controlled trial to promote cycling to school in adolescents: The PACO study
(2021)
Chillón, Palma; Gálvez-Fernández, Patricia; Huertas-Delgado, Francisco Javier; Herrador-Colmenero, Manuel; Barranco-Ruiz, Yaira; Villa-González, Emilio; Aranda-Balboa, María Jesús; Saucedo-Araujo, Romina Gisele; Campos-Garzón, Pablo; Molina-Soberanes, Daniel; Segura-Díaz, José Manuel; Rodríguez-Rodríguez, Fernando; Lara-Sánchez, Amador Jesús; Queralt, Ana; Molina-García, Javier; Bengoechea, Enrique García; Mandic, Sandra
Abstract:
“Cycling and Walk to School” (PACO, by its Spanish acronym) that aims to promote cycling to and from school and physical activity (PA) in adolescents. This study will examine the effects of this intervention in cycling and active commuting to and from school (ACS), PA and several ACS-related factors based on self-determination theory (SDT) and a social-ecological model (SEM). A total of 360 adolescents attending six high schools (three experimental and three control) from three Spanish cities will participate in this randomized controlled trial. The intervention (four cycling sessions; 1–2 h per session, one session per week) will be conducted by the research staff; the control group will continue their usual activities. PA levels will be measured by accelerometers, whereas ACS and the other study variables will be self-reported using questionnaires at baseline and post-intervention. The primary outcomes will be: rates of cycling to school, ACS and PA levels. In addition, SDT-relate...
http://hdl.handle.net/10344/9906
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A change of Rhythm, Nicaraguan Style, in children and young people's participation: A simplified interpretation of the new international framework "A toolkit for monitoring and evaluating children’s participation" informed by the experience of the Nicaraguan pilot project 2011-2013
(2021)
Shier, Harry
A change of Rhythm, Nicaraguan Style, in children and young people's participation: A simplified interpretation of the new international framework "A toolkit for monitoring and evaluating children’s participation" informed by the experience of the Nicaraguan pilot project 2011-2013
(2021)
Shier, Harry
Abstract:
Since the UN Convention on the Rights of the Child was adopted in 1989, we have known that all the world’s children have the right to participate; particularly, as defined in Article 12, the right to express their opinions and have these given due weight on decision-making on all aspects of their lives.
http://hdl.handle.net/10197/12062
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Software engineering in civic tech a case study about code for Ireland
(2019)
Knutas, Antti; Palacin, Victoria; Maccani, Giovanni; Helfert, Markus
Software engineering in civic tech a case study about code for Ireland
(2019)
Knutas, Antti; Palacin, Victoria; Maccani, Giovanni; Helfert, Markus
Abstract:
Civic grassroots have proven their ability to create useful and scalable software that addresses pressing social needs. Although software engineering plays a fundamental role in the process of creating civic technology, academic literature that analyses the software development processes of civic tech grassroots is scarce. This paper aims to advance the understanding of how civic grassroots tackle the different activities in their software development processes. In this study, we followed the formation of two projects in a civic tech group (Code for Ireland) seeking to understand how their development processes evolved over time, and how the group carried out their work in creating new technology. Our preliminary findings show that such groups are capable of setting up systematic software engineering processes that address software specification, development, validation, and evolution. While they were able to deliver software according to self-specified quality standards, the group ...
http://mural.maynoothuniversity.ie/14245/
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Exploring data value assessment: a survey method and investigation of the perceived relative importance of data value dimensions
(2019)
Brennan, Rob; Attard, Judie; Petkov, Plamen; Nagle, Tadhg; Helfert, Markus
Exploring data value assessment: a survey method and investigation of the perceived relative importance of data value dimensions
(2019)
Brennan, Rob; Attard, Judie; Petkov, Plamen; Nagle, Tadhg; Helfert, Markus
Abstract:
This paper describes the development and execution of a data value assessment survey of data professionals and academics. Its purpose was to explore more effective data value assessment techniques and to better understand the perceived relative importance of data value dimensions for data practitioners. This is important because despite the current deep interest in data value, there is a lack of data value assessment techniques and no clear understanding of how individual data value dimensions contribute to a holistic model of data value. A total of 34 datasets were assessed in a field study of 20 organisations in a range of sectors from finance to aviation. It was found that in 17 out of 20 of the organisations contacted that no data value assessment had previously taken place. All the datasets evaluated were considered valuable organisational assets and the operational impact of data was identified as the most important data value dimension. These results can inform the community’...
http://mural.maynoothuniversity.ie/14246/
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Provision of tailored health information for patient empowerment: an initial study
(2019)
Alfano, Marco; Lenzitti, Biagio; Taibi, Davide; Helfert, Markus
Provision of tailored health information for patient empowerment: an initial study
(2019)
Alfano, Marco; Lenzitti, Biagio; Taibi, Davide; Helfert, Markus
Abstract:
Search of “right” health information by patients/citizens is an important step towards their empowerment. The number of health information seekers on the Internet is steadily increasing over the years so it is crucial to understand their information needs and the challenges they face during the search process. However, generic search engines do not make any distinction among the users and overload them with the amount of information. Moreover, specific search engines/sites mostly work on medical literature and are built by hand. This paper analyses the possibility of providing the user with tailored web information by exploiting the web semantic capabilities and, in particular, those of schema.org and its healthlifesci extension. After presenting a short review of the main user requirements when searching for health information on the Internet, an analysis of schema.org and its health-lifesci extension is shown to understand the main properties and semantic capabilities in the healt...
http://mural.maynoothuniversity.ie/14248/
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Splintering disaster: relocating harm and remaking nature after the 2011 floods in Bangkok
(2020)
Marks, Danny; Elinof, Eli
Splintering disaster: relocating harm and remaking nature after the 2011 floods in Bangkok
(2020)
Marks, Danny; Elinof, Eli
Abstract:
In the wake of the costly 2011 floods, the city of Bangkok struggled to respond to the water inundating Thailand’s major hub. In response, Thai leaders primarily blamed the external forces of nature and climate change. Depoliticising disasters and absolving national leaders of responsibility, these discourses about nature and climate change as the main cause of flooding led policymakers to primarily build infrastructure to block and drain water. We argue that the location and patterns of flood protection infrastructure reflect flows of power and the circulation of capital. We build upon Graham and Marvin’s notion of ‘splintering urbanism’ to develop the concept of ‘splintering disaster’. We do so to make sense of the spatially dispersed, but ideologically unified strategy of flood protection adopted in Bangkok. We argue that the splintered nature of flood infrastructures demonstrates the varied and complex factors that produce new regimes of urban water control in the wake of disast...
http://doras.dcu.ie/25687/
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Participatory health research with migrants: opportunities, challenges, and way forwards
(2021)
Roura, Maria; Dias, Sonia; LeMaster, Joseph W.; MacFarlane, Anne E.
Participatory health research with migrants: opportunities, challenges, and way forwards
(2021)
Roura, Maria; Dias, Sonia; LeMaster, Joseph W.; MacFarlane, Anne E.
Abstract:
Context: Migration is one of the most politically pressing issues of the 21st century but migrant health remains an under-researched area. The International Collaboration for Participatory Health Research (ICPHR) working group on migration developed this position statement to address opportunities and challenges in relation to migrant health. It aims to contribute to a shift from a deficit model that sees migrants as pas sively affected by policies to their reconceptualization as citizens who are engaged in the co-creation of solutions. Methods: This paper examines the opportunities and challenges posed by the use of PHR with migrants. It draws on a broad literature to provide examples of successful PHR with migrants and highlights critical issues for consideration. Findings: Successful initiatives illustrate the value of engaging migrants in the defini tion of the research agenda, the design and implementation of health interventions, the identification of health-protective...
http://hdl.handle.net/10344/9910
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The republican virtues of the “new commonwealth model of constitutionalism”
(2017)
Hickey, Tom
The republican virtues of the “new commonwealth model of constitutionalism”
(2017)
Hickey, Tom
Abstract:
Based on a republican theory of democracy as equally shared popular control, drawn from Philip Pettit’s recent work, this article argues in favor of the “new commonwealth model of constitutionalism” practiced in Canada, the UK, and elsewhere. It claims that the emphasis that the new commonwealth model places on political agents in the rights-related dimensions of the legislative process corresponds with the republican account of rights as political claims but also that the constricted role played by judges under the model answers to a number of important republican concerns around contestation and the dispersal of power. In particular the article argues that the role of judges under the model can be understood as contributing to the gradual emergence of norms that are “commonly avowable” or shareable, and to the refining of those norms over time, such that it enhances the control exercised by citizens over government. In this way the role of judges under the model—in contrast to tha...
http://doras.dcu.ie/25695/
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Experiences and Perceptions of Trans and Gender Non-Binary People Regarding Their Psychosocial Support Needs: A Systematic Review of the Qualitative Research Evidence
(2021)
Mc Cann, Edward
Experiences and Perceptions of Trans and Gender Non-Binary People Regarding Their Psychosocial Support Needs: A Systematic Review of the Qualitative Research Evidence
(2021)
Mc Cann, Edward
Abstract:
People who identify as trans and gender non-binary experience many challenges in their lives and more interest is being paid to their overall health and wellbeing. However, little is known about their experiences and perceptions regarding their distinct psychosocial needs. The aim of this systematic review is to critically evaluate and synthesize the existing research evidence relating to the unique psychological and social experiences of trans people and identify aspects that may help or hinder access to appropriate psychosocial interventions and supports. The PRISMA procedure was utilized. A search of relevant databases from January 2010 to January 2021 was undertaken. Studies were identified that involved trans people, and addressed issues related to their psychosocial needs. The search yielded 954 papers in total. Following the application of rigorous inclusion and exclusion criteria a total of 18 papers were considered suitable for the systematic review. Quality was assessed us...
http://hdl.handle.net/2262/95880
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What Thomas Hobbes might say about Boris Johnson and the Northern Ireland Protocol
(2021)
Bufacchi, Vittorio
What Thomas Hobbes might say about Boris Johnson and the Northern Ireland Protocol
(2021)
Bufacchi, Vittorio
Abstract:
The EU has indicated it intends to pursue legal action against the UK over the extension of grace periods for post-Brexit checks on certain goods entering Northern Ireland from Britain. Vittorio Bufacchi argues that while the UK's approach may bring short-term benefits, these will be insignificant when set against the long-term reputational costs that come with breaking international agreements.
http://hdl.handle.net/10468/11162
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Outsmarting the gig-economy through collective bargaining – EU competition law as a barrier to smart cities?
(2018)
Schiek, Dagmar; Gideon, Andrea
Outsmarting the gig-economy through collective bargaining – EU competition law as a barrier to smart cities?
(2018)
Schiek, Dagmar; Gideon, Andrea
Abstract:
In August 2016, drivers delivering meals in London after being booked via the platforms ‘deliveroo’ and ‘UberEATS’ made headlines by challenging working practices in the gig-economy through collective industrial action. Dissatisfaction resulted from extremely low levels of pay as well as a new payment calculation system being introduced without consultation. This indicates that the ‘gig-economy’, though arguably contributing to ‘smart cities’, may not always constitute the smartest solution for those serving within it. However, it also highlights that collective industrial action is far from structurally impossible for workers in the ‘gig-economy’, even though management of labour relies on anonymous and automated micro-management through internet platforms and apps. Indeed, collective organisation may seem the smartest solution for upgrading the gig-economy for its workers. This article develops an original contribution to the interface of smart technology in the gig-economy, colle...
http://hdl.handle.net/10468/11165
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The wave energy converter control competition
(2019)
Ringwood, John; Ferri, Francesco; Tom, Nathan; Ruehl, Kelley M.; Faedo, Nicolás; Bacell...
The wave energy converter control competition
(2019)
Ringwood, John; Ferri, Francesco; Tom, Nathan; Ruehl, Kelley M.; Faedo, Nicolás; Bacelli, Giorgio; Yu, Yi-Hsiang; Coe, Ryan G.
Abstract:
Over the past two years, a wave energy converter control systems competition (WECCCOMP) has been in progress, with the objective of comparing different wave energy converter (WEC) control paradigms on a standard benchmark problem. The target system is a point absorber, corresponding to a single float with an absolute reference, of the WaveStar WEC prototype. The system was modelled in WEC-Sim, with the hydrodynamic parameters validated against tank test data. Competitors were asked to design and implement a WEC control system for this model, with performance evaluated across six sea states. The evaluation criteria included a weighted combination of average converted power, peak/average power, and the degree to which the system physical constraints were exploited or temporarily exceeded. This paper provides an overview of the competition, which includes a comparative evaluation of the entries and their performance on the simulation model. It is intended that this paper will act as an...
http://mural.maynoothuniversity.ie/14271/
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On the design of broadband quasioptical systems for submillimeter-wave radio-astronomy receivers
(1991)
Withington, Stafford; Murphy, J.Anthony; Egan, A.; Hills, R.E.
On the design of broadband quasioptical systems for submillimeter-wave radio-astronomy receivers
(1991)
Withington, Stafford; Murphy, J.Anthony; Egan, A.; Hills, R.E.
Abstract:
In this paper, we summarize the issues that should be considered when designing broadband quasioptical systems for submillimetre-wave radioastronomy receivers. We cover topics such as bandwidth, cross-talk, truncation, and aberrations, and we argue that it should be possible to manufacture high-efficiency systems that have several octaves of bandwidth. A key feature of the paper is that we use the language of multimode Gaussian optics throughout, and in this way, we emphasize that a receiver is a diffraction-limited imaging system rather than just a collection of components for guiding Gaussian beams. The whole discussion is conducted in terms of a particular system we are constructing for the James Clerk Maxwell Telescope in Hawaii.
http://mural.maynoothuniversity.ie/14279/
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Statistical Power and Translationese in Machine Translation Evaluation
(2020)
Graham, Yvette
Statistical Power and Translationese in Machine Translation Evaluation
(2020)
Graham, Yvette
Abstract:
The term translationese has been used to describe features of translated text, and in this paper, we provide detailed analysis of potential adverse effects of translationese on machine translation evaluation. Our analysis shows differences in conclusions drawn from evaluations that include translationese in test data compared to experiments that tested only with text originally composed in that language. For this reason we recommend that reverse-created test data be omitted from future machine translation test sets. In addition, we provide a re-evaluation of a past machine translation evaluation claiming human-parity of MT. One important issue not previously considered is statistical power of significance tests applied to comparison of human and machine translation. Since the very aim of past evaluations was investigation of ties between human and MT systems, power analysis is of particular importance, to avoid, for example, claims of human parity simply corresponding to Type II err...
http://hdl.handle.net/2262/95911
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Understanding the global challenges to accessing appropriate wheelchairs: position paper
(2021)
Gowran, Rosemary Joan; Bray, Nathan; Goldberg, Mary; Rushton, Paula; Saab, Marie Barhou...
Understanding the global challenges to accessing appropriate wheelchairs: position paper
(2021)
Gowran, Rosemary Joan; Bray, Nathan; Goldberg, Mary; Rushton, Paula; Saab, Marie Barhouche Abou; Constantine, David; Ghosh, Ritu; Pearlman, Jonathan
Abstract:
Introduction: Appropriate wheelchairs are often essential for the health and wellbeing of people with mobility impairments to enhance fundamental freedoms and equal opportunity. To date, provision has mainly focused on just delivering the wheelchair instead of following an evidence-based wheelchair service delivery process. In addition, many governments have not committed to a national wheelchair provision policy. Approach: To prepare this position paper, a systemic development model, founded on the sustainable human security paradigm, was employed to explore the global challenges to accessing appropriate wheelchairs. Positions: I: Consideration of key perspectives of wheelchair provision across the life course is essential to meet the needs to children, adults, older people and their families; II: Comprehensive wheelchair service delivery processes and a competent workforce are essential to ensure appropriate wheelchair service provision; III: Evaluations on wheelchair product qual...
http://hdl.handle.net/10344/9932
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A multiscale experimentally-based finite element model to predict microstructure and damage evolution in martensitic steels
(2021)
Meade, Edward D.; Sun, Fengwei; Tiernan, Peter; O’Dowd, Noel P.
A multiscale experimentally-based finite element model to predict microstructure and damage evolution in martensitic steels
(2021)
Meade, Edward D.; Sun, Fengwei; Tiernan, Peter; O’Dowd, Noel P.
Abstract:
The objective of this work is to investigate the plastic deformation and associated microstructural evolution and damage in a martensitic steel at multiple length scales, using a combination of finite-element (FE) modelling and experimental measurements. A multiscale model is developed to predict damage evolution in the necked region of a uniaxial tensile test specimen. At the macroscale, a von Mises plasticity FE model in conjunction with a Gurson-Tvergaard-Needleman damage model is used to predict the global deformation and damage evolution. A physically based crystal plasticity model, incorporating a damage variable is used to investigate the microscale plastic deformation behaviour and the changes in crystal orientation under large strains. The model predicts that slip bands form at the onset of plastic deformation and rotate to become almost parallel to the loading direction at large strain. In the necked region, the initially randomly orientated microstructure develop...
http://hdl.handle.net/10344/9933
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The case of Golden Jubilants: using a Prototype to support Healthcare Technology Research
(2021)
Ahmad, Bilal; Beecham, Sarah; Richardson, Ita
The case of Golden Jubilants: using a Prototype to support Healthcare Technology Research
(2021)
Ahmad, Bilal; Beecham, Sarah; Richardson, Ita
Abstract:
This case study paper describes the development and evaluation of a prototype, Golden Jubilants, a smartphone app. Golden Jubilants was built within a software engineering in healthcare project, ReDEAP, that aimed to identify a set of recommendations for the design of smartphone apps for older adults aged over 50. Prototype development and evaluation is a recognized way to elicit meaningful feedback from any user group. This tangible artifact was interactive and provided fruitful engagement for us as researchers, and for the older adults who participated. This short paper presents the prototype evaluation process, and techniques used to ensure older adult involvement. To conclude, we discuss four key recommendations for consideration by software engineering in healthcare researchers who are using prototypes in their research – develop the research project through public and patient involvement, harness the potential of established evaluation and testing standards, de...
http://hdl.handle.net/10344/9938
Marked
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Assessing Human-Parity in Machine Translation on the Segment Level
(2020)
Graham, Yvette
Assessing Human-Parity in Machine Translation on the Segment Level
(2020)
Graham, Yvette
Abstract:
Recent machine translation shared tasks have shown top-performing systems to tie or in some cases even outperform human translation. Such conclusions about system and human performance are, however, based on estimates aggregated from scores collected over large test sets of translations and unfortunately leave some remaining questions unanswered. For instance, simply because a system significantly outperforms the human translator on average may not necessarily mean that it has done so for every translation in the test set. Firstly, are there remaining source segments present in evaluation test sets that cause significant challenges for top-performing systems and can such challenging segments go unnoticed due to the opacity of current human evaluation procedures? To provide insight into these issues we carefully inspect the outputs of top-performing systems in the most recent WMT-19 news translation shared task for all language pairs in which a system either tied or outperformed huma...
http://hdl.handle.net/2262/95918
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Ocean Energy Systems Wave Energy Modelling Task: Modelling, Verification and Validation of Wave Energy Converters
(2019)
Wendt, Fabian; Nielsen, Kim; Yu, Yi-Hsiang; Bingham, Harry; Eskilsson, Claes; Kramer, M...
Ocean Energy Systems Wave Energy Modelling Task: Modelling, Verification and Validation of Wave Energy Converters
(2019)
Wendt, Fabian; Nielsen, Kim; Yu, Yi-Hsiang; Bingham, Harry; Eskilsson, Claes; Kramer, Morten; Babarit, Aurélien; Bunnik, Tim; Costello, Ronan; Crowley, Sarah; Genron, Benjamin; Giorgi, Giuseppe; Giorgi, Simone; Girardin, Samuel; Greaves, Deborah; Heras, Pilar; Hoffman, Johan; Islam, Hafizul; Jakobsen, Ken-Robert; Janson, Carl-Erik
Abstract:
The International Energy Agency Technology Collaboration Programme for Ocean Energy Systems (OES) initiated the OES Wave Energy Conversion Modelling Task, which focused on the verification and validation of numerical models for simulating wave energy converters (WECs). The long-term goal is to assess the accuracy of and establish confidence in the use of numerical models used in design as well as power performance assessment of WECs. To establish this confidence, the authors used different existing computational modelling tools to simulate given tasks to identify uncertainties related to simulation methodologies: (i) linear potential flow methods; (ii) weakly nonlinear Froude–Krylov methods; and (iii) fully nonlinear methods (fully nonlinear potential flow and Navier–Stokes models). This article summarizes the code-to-code task and code-to-experiment task that have been performed so far in this project, with a focus on investigating the impact of different levels of nonlinearities i...
http://mural.maynoothuniversity.ie/14293/
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Pattern Sensing Based Digital Predistortion of RF Power Amplifiers under Dynamical Signal Transmission
(2021)
Yin, Hang; Yu, Chao; Lu, Qianyun; Zhu, Anding; et al.
Pattern Sensing Based Digital Predistortion of RF Power Amplifiers under Dynamical Signal Transmission
(2021)
Yin, Hang; Yu, Chao; Lu, Qianyun; Zhu, Anding; et al.
Abstract:
The 2019 IEEE MTT-S International Microwave Conference on Hardware and Systems for 5G and Beyond (IMC-5G), Atlanta, Georgia, United States of America, 15-16 August 2019
In this paper, a pattern sensing based digital predistortion (DPD) technique for radio frequency (RF) power amplifiers (PAs) under dynamical signal transmission is proposed. Unlike conventional methods where real time re-calibration is required, this approach utilizes a low resolution amplitude-modulation to amplitude-modulation (AM/AM) pattern to sense PA characteristics and then quickly select proper DPD coefficients to linearize the PA. Experimental results show that the proposed method can provide an efficient a nd effective w ay to deal with complex dynamic signal transmission scenarios and maintain very good linearization performance, which is very suitable for future 5G applications.
Science Foundation Ireland
National Natural Science Foundation of China
http://hdl.handle.net/10197/12072
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Peak-to-average power ratio reduction of SFBC MIMO-OFDM signals using unused tones
(2021)
Braz, Isabela; Guan, Lei; Zhu, Anding; Brazil, Thomas J.
Peak-to-average power ratio reduction of SFBC MIMO-OFDM signals using unused tones
(2021)
Braz, Isabela; Guan, Lei; Zhu, Anding; Brazil, Thomas J.
Abstract:
The 2010 IEEE International Microwave Workshop Series on RF Front-ends for Software Defined and Cognitive Radio Solutions (IMWS), Aveiro, Portugal, 22-23 February 2010
Multiple input multiple output techniques combined with orthogonal frequency division multiplexing (MIMO-OFDM) provide a promising approach for wireless systems. However, a serious drawback of the OFDM system is the high peak-toaverage power ratio (PAPR), which may severely affect the power efficiency of RF power amplifiers. In this paper, we propose a simple method to reduce the PAPR of MIMO-OFDM signals based on the use of unused subcarriers. Instead of processing the signals at each transmitter separately, a peak cancelling signal is generated at one antenna and is then applied to all the others with only simple modifications. Simulation has shown that a minimum 2 dB reduction in PAPR can be achieved for all transmit signals using this approach. As the signal processing is nearly all done at a single transmitte...
http://hdl.handle.net/10197/12077
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