A non-parametric topical relevance model     

Debasis Ganguly  Gareth J. F. Jones 《Information Retrieval》2018,21(5):449-479

An information retrieval (IR) system can often fail to retrieve relevant documents due to the incomplete specification of information need in the user’s query. Pseudo-relevance feedback (PRF) aims to improve IR effectiveness by exploiting potentially relevant aspects of the information need present in the documents retrieved in an initial search. Standard PRF approaches utilize the information contained in these top ranked documents from the initial search with the assumption that documents as a whole are relevant to the information need. However, in practice, documents are often multi-topical where only a portion of the documents may be relevant to the query. In this situation, exploitation of the topical composition of the top ranked documents, estimated with statistical topic modeling based approaches, can potentially be a useful cue to improve PRF effectiveness. The key idea behind our PRF method is to use the term-topic and the document-topic distributions obtained from topic modeling over the set of top ranked documents to re-rank the initially retrieved documents. The objective is to improve the ranks of documents that are primarily composed of the relevant topics expressed in the information need of the query. Our RF model can further be improved by making use of non-parametric topic modeling, where the number of topics can grow according to the document contents, thus giving the RF model the capability to adjust the number of topics based on the content of the top ranked documents. We empirically validate our topic model based RF approach on two document collections of diverse length and topical composition characteristics: (1) ad-hoc retrieval using the TREC 6-8 and the TREC Robust ’04 dataset, and (2) tweet retrieval using the TREC Microblog ’11 dataset. Results indicate that our proposed approach increases MAP by up to 9% in comparison to the results obtained with an LDA based language model (for initial retrieval) coupled with the relevance model (for feedback). Moreover, the non-parametric version of our proposed approach is shown to be more effective than its parametric counterpart due to its advantage of adapting the number of topics, improving results by up to 5.6% of MAP compared to the parametric version.  相似文献   

From Vocational to Higher Education. An International Perspective – By Gavin Moodie     

Gareth Parry 《Higher Education Quarterly》2011,65(4):434-436

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Education research and policy making in higher education: the case of Dearing     

Gareth Parry 《教育政策杂志》2013,28(3):225-241

In establishing a National Committee of Inquiry into Higher Education in the United Kingdom (the Dearing Committee), the Government expected short-term problems and long-term developments to be examined in less than half the average time taken by previous inquiries. Conscious of the intellectual authority of its predecessor, the Robbins Committee, the Dearing inquiry commissioned a large number of research and analytical studies to inform its deliberations. The ways that research and other forms of evidence were collected and considered by the inquiry are discussed in relation to four themes: the context and conditions for the inquiry; the nature of the work commissioned; the treatment of public evidence and the use of research to inform key recommendations; and what the episode disclosed about the relationship between education research and policy-making in higher education. In the course of this commentary, it is suggested that the uneven engagement with research and academic literatures in the Dearing inquiry was not simply a function of its terms and conditions of existence, but reflected more general features of the contemporary research base and policy environment in higher education.  相似文献   

A Place for Poetry     

Gareth Calway 《English in Education》2007,41(2):5-6

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Do dynamic work instructions provide an advantage over static instructions in a small scale assembly task?     

Gareth Watson  Joe Butterfield  Ricky Curran  Cathy Craig 《Learning and Instruction》2010,20(1):84-93

Recent studies exploring the effects of instructional animations on learning compared to static graphics have yielded mixed results. Few studies have explored their effectiveness in portraying procedural-motor information. Opportunities exist within an applied (manufacturing) context for instructional animations to be used to facilitate build performance on an assembly line. The present study compares build time performance across successive builds when using animation, static diagrams or text instructions to convey an assembly sequence for a handheld device. Although an immediate facilitating effect of animation was found, yielding a significantly faster build time for Build 1, this advantage had disappeared by Build 3.  相似文献   

Michael Shattock (2012) Making Policy in British Higher Education 1945–2011. Maidenhead: McGraw‐Hill and Open University Press. 296 pp. ISBN‐13: 978 0 335241866. eISBN: 978 0 335241873; £37.99.          下载免费PDF全文

Gareth Parry 《Higher Education Quarterly》2015,69(2):214-218

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Differences in practitioners’ understanding of play and how this influences pedagogy and children’s perceptions of play   总被引：1，自引：0，他引：1  

Karen McInnes  Justine Howard  Gareth Miles  Kevin Crowley 《Early Years: An International Journal of Research and Development》2011,31(2):121-133

This paper presents research that examines the links between practitioners’ understanding of play and its relationship to learning, their pedagogic interactions with children and children’s own perceptions of their play. Previous research has shown a mismatch between practitioners’ understanding of play and their practice. This research identifies how differences in understanding of play, especially the role of the adult, by practitioners in two unrelated settings are associated with variation in pedagogic interactions emphasising choice and control. Furthermore, it is argued that these differences are reflected in differences in children’s use of the cue of adult presence as a defining feature of play and not-play activities.  相似文献   

Lower limb joint kinetics and ankle joint stiffness in the sprint start push-off   总被引：1，自引：0，他引：1  

Charalambous L  Irwin G  Bezodis IN  Kerwin D 《Journal of sports sciences》2012,30(1):1-9

Sprint push-off technique is fundamental to sprint performance and joint stiffness has been identified as a performance-related variable during dynamic movements. However, joint stiffness for the push-off and its relationship with performance (times and velocities) has not been reported. The aim of this study was to quantify and explain lower limb net joint moments and mechanical powers, and ankle stiffness during the first stance phase of the push-off. One elite sprinter performed 10 maximal sprint starts. An automatic motion analysis system (CODA, 200 Hz) with synchronized force plates (Kistler, 1000 Hz) collected kinematic profiles at the hip, knee, and ankle and ground reaction forces, providing input for inverse dynamics analyses. The lower-limb joints predominately extended and revealed a proximal-to-distal sequential pattern of maximal extensor angular velocity and positive power production. Pearson correlations revealed relationships (P < 0.05) between ankle stiffness (5.93 ± 0.75 N x m x deg(-1)) and selected performance variables. Relationships between negative power phase ankle stiffness and horizontal (r = -0.79) and vertical (r = 0.74) centre of mass velocities were opposite in direction to the positive power phase ankle stiffness (horizontal: r = 0.85; vertical: r = -0.54). Thus ankle stiffness may affect the goals of the sprint push-off in different ways, depending on the phase of stance considered.  相似文献   

Reappraising the Apparent Underachievement of Boys at School     

Stephen Gorard  Gareth Rees  Jane Salisbury 《Gender and education》1999,11(4):441-454

This article challenges two widely-held beliefs about the differences in the performance of boys and girls at school. The 'gap' between the achievement of boys and girls is not growing, and may be shrinking. The gap is not predominantly a problem of low achievement, nor is it uniformly distributed across the range of attainments. The gap, in favour of girls, mainly appears at the higher levels in any assessment. The change in understanding of the nature of the gender gap described here comes from simple methodological advances in the analysis of gendered results in examination and statutory assessments. The implications for research and policy in this area are substantial, since unless the nature of the problem is well understood research may be directed at explicating, and policy directed at ameliorating, a gender gap of a form which simply does not exist. For example, while disaffection from the process of education may be a very real problem and certainly one that is worthy of research, there is little evidence here that it is primarily a gender-related problem.  相似文献   

Altitude training in endurance running: perceptions of elite athletes and support staff     

Gareth Turner  Barry W Fudge  Jamie S M Pringle  Neil S Maxwell  Alan J Richardson 《Journal of sports sciences》2019,37(2):163-172

This study sought to establish perceptions of elite endurance athletes on the role and worth of altitude training. Elite British endurance runners were surveyed to identify the altitude and hypoxic training methods utilised, along with reasons for use, and any situational, cultural and behaviour factors influencing these. Prior to the 2012 Olympics Games, 39 athletes and 20 support staff (coaches/practitioners) completed an internet-based survey to establish differences between current practices and the accepted “best-practice”. Almost all of the athletes (98%) and support staff (95%) surveyed had utilised altitude and hypoxic training, or had advised it to athletes. 75% of athletes believed altitude and hypoxia to be a “very important” factor in their training regime, with 50% of support staff believing the same. Athletes and support staff were in agreement of the methods of altitude training utilised (i.e. 'hypoxic dose’ and strategy), with camps lasting 3–4 weeks at 1,500–2,500 m being the most popular. Athletes and support staff are utilising altitude and hypoxic training methods in a manner agreeing with research-based suggestions. The survey identified a number of specific challenges and priorities, which could provide scope to optimise future altitude training methods for endurance performance in these elite groups.  相似文献