Exploring criteria for successful query expansion in the genomic domain

Query Expansion is commonly used in Information Retrieval to overcome vocabulary mismatch issues, such as synonymy between the original query terms and a relevant document. In general, query expansion experiments exhibit mixed results. Overall TREC Genomics Track results are also mixed; however, results from the top performing systems provide strong evidence supporting the need for expansion. In this paper, we examine the conditions necessary for optimal query expansion performance with respect to two system design issues: IR framework and knowledge source used for expansion. We present a query expansion framework that improves Okapi baseline passage MAP performance by 185%. Using this framework, we compare and contrast the effectiveness of a variety of biomedical knowledge sources used by TREC 2006 Genomics Track participants for expansion. Based on the outcome of these experiments, we discuss the success factors required for effective query expansion with respect to various sources of term expansion, such as corpus-based cooccurrence statistics, pseudo-relevance feedback methods, and domain-specific and domain-independent ontologies and databases. Our results show that choice of document ranking algorithm is the most important factor affecting retrieval performance on this dataset. In addition, when an appropriate ranking algorithm is used, we find that query expansion with domain-specific knowledge sources provides an equally substantive gain in performance over a baseline system.

Video game discourses and implications for game-based education

Increasingly prevalent educational discourses promote the use of video games in schools and universities. At the same time, populist discourses persist, particularly in print media, which condemn video games because of putative negative effects on behaviour and socialisation. These contested discourses, we suggest, influence the acceptability of games and limit critical analysis of their effectiveness as pedagogic tools. This article focuses on the representation of video games in media discourse. We present insights from a small-scale study of the construction of video game discourses in the UK print media in 2013, and discuss three areas that emerged. First, the assumptions inherent in the representation of the ‘video game’; second, the implied lack of agency in the behaviour of ‘the gamer’; and third, the way in which blame is manipulated. Finally, we consider the implications for game-based education.     

Phoneme awareness in language-delayed children: comparative studies and intervention

Our initial study compared 15 normally- developing and 13 language- delayed four- and- five- year- olds on a range of phoneme awareness tasks differing in the degree of explicit linguistic analysis required. The language- delayed group performed more poorly than the normally- developing children, and there were significant group differences on several tasks. A significant interaction effect reflected the particular difficulty the language- delayed group had with the more explicit tasks. Follow- up testing suggests that group differences are maintained over time and that the language- delayed children perform more poorly than the normally- developing children on tests of decoding and spelling at the end of first grade. An intervention study, training phoneme awareness skills in language-delayed kindergarten children, was undertaken with a new group of subjects. Fourteen language- delayed children participated in 16 training sessions over eight weeks. Fourteen normal and 14 language- delayed children served as controls. Only the language- delayed training group made significant gains from pre- to posttraining measures. Following training, the language-delayed training group performed similarly to normal controls and significantly better than language- delayed controls whom they had matched before intervention. One year later, the language-delayed children who received training maintained their gains on phoneme analysis tasks and performed significantly better than the language-delayed controls on reading measures. Educational implications are discussed.     

Occupational values and employment: A follow-up study of graduate men and women

Undergraduate job values have been reported as reflecting both the sex and social origins of the student. The present study assesses whether such differences are of any occupational significance. Ratings on 30 job attributes were collected from 310 final year undergraduates at universities and colleges throughout Britain. The four factors extracted from these ratings were then related to the job held at 26 years. Although the proportions of men and women differed between jobs, this difference was adequately explained by the job values reported by the students before graduation. There was no evidence that women had different values (at college) than men who were, at 26, to do a similar type of job. The origins of sex and social class differences in students' values are explored and it is concluded that there is a need for a new approach to careers education for the highly intelligent student of limited aspiration.     

Access to local books: the effects of Read Malawi from a children's rights perspective

Children in low‐income, postcolonial countries such as Malawi have few opportunities with quality reading materials that promote independence as readers. In this study, we argue that access to locally produced text relevant to linguistic and cultural contexts is a fundamental human right for children throughout the world. Situating this study within the intersection of research on children's rights and complementary reading materials, we analyse data from a project in Malawi. We consider the ways in which a respect for children's educational rights – specifically, their rights to access information via children's books – can help them develop their biliteracy. Additionally, we examine how the Read Malawi program contributes to Malawian children's literacy development in both national and official languages. Our findings suggest not only a humanistic need for quality complementary books, but also the empirical justification for books in the hands of children; in particular, an interconnected relationship between borrowing books from school and engagement with Read Malawi was found, especially when we explore children's English proficiency. Through Read Malawi, this study exemplifies what a quality literacy intervention can do in supporting children's Chichewa and English proficiency and improving their rights to quality education.     

Nonverbal Executive Function is Mediated by Language: A Study of Deaf and Hearing Children

Studies have suggested that language and executive function (EF) are strongly associated. Indeed, the two are difficult to separate, and it is particularly difficult to determine whether one skill is more dependent on the other. Deafness provides a unique opportunity to disentangle these skills because in this case, language difficulties have a sensory not cognitive basis. In this study, deaf (n = 108) and hearing (n = 125) children (age 8 years) were assessed on language and a wide range of nonverbal EF tasks. Deaf children performed significantly less well on EF tasks, even controlling for nonverbal intelligence and speed of processing. Language mediated EF skill, but the reverse pattern was not evident. Findings suggest that language is key to EF performance rather than vice versa.     

Silences of ethical practice: dilemmas for researchers using social media

Social media, such as social network sites and blogs, are increasingly being used as core or ancillary components of educational research, from recruitment to observation and interaction with researchers. However, this article reveals complex ethical dilemmas surrounding consent, traceability, working with children, and illicit activity that we have faced as education researchers for which there is little specific guidance in the literature. We believe that ethical research committees cannot, and should not, be relied upon as our ethical compass as they also struggle to deal with emerging technologies and their implications. Consequently, we call for researchers to report on the ethical dilemmas in their practice to serve as a guide for those who follow. We also recommend considering research ethics as an ongoing dialogical process in which the researcher, participants, and ethics committee work together in identifying potential problems as well as finding ways forward.     

A double win: practice and participation in an action learning facilitators’ set

This account of practice shares insights from past and present members of a self-facilitating action learning set, where each of the members is an action learning facilitator. Motivations for joining the set encompassed the opportunity to ‘practice what you preach’ by being a set member as well as a facilitator, the potential to refine and develop facilitation practices in a safe environment and space for personal development.