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1.
Searching online information resources using mobile devices is affected by small screens which can display only a fraction
of ranked search results. In this paper we investigate whether the search effort can be reduced by means of a simple user
feedback: for a screenful of search results the user is encouraged to indicate a single most relevant document. In our approach
we exploit the fact that, for small display sizes and limited user actions, we can construct a user decision tree representing
all possible outcomes of the user interaction with the system. Examining the trees we can compute an upper limit on relevance
feedback performance. In this study we consider three standard feedback algorithms: Rocchio, Robertson/Sparck-Jones (RSJ)
and a Bayesian algorithm. We evaluate them in conjunction with two strategies for presenting search results: a document ranking
that attempts to maximize information gain from the user’s choices and the top-D ranked documents. Experimental results indicate
that for RSJ feedback which involves an explicit feature selection policy, the greedy top-D display is more appropriate. For
the other two algorithms, the exploratory display that maximizes information gain produces better results. We conducted a
user study to compare the performance of the relevance feedback methods with real users and compare the results with the findings
from the tree analysis. This comparison between the simulations and real user behaviour indicates that the Bayesian algorithm,
coupled with the sampled display, is the most effective.
Extended version of “Evaluating Relevance Feedback Algorithms for Searching on Small Displays, ” Vishwa Vinay, Ingemar J.
Cox, Natasa Milic-Frayling, Ken Wood published in the proceedings of ECIR 2005, David E. Losada, Juan M. Fernández-Luna (Eds.),
Springer 2005, ISBN 3-540-25295-9 相似文献
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This paper examines the persistence of Americans’ misunderstanding of the function of privacy policies. We also identify groups that have misplaced confidence in the privacy policy label and address whether the groups’ patterns of misperception have changed over time. The findings add a new dimension to the argument that the usefulness of privacy policies needs to be reassessed. As a remedy, we call for media literacy programs to address structural features of media systems that lead to broadly held misperceptions such as the one examined here. 相似文献
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This paper gives background information on early childhood services in Ireland and presents the results of a survey of the preschool experiences of 1065 children. The results of the survey suggest that the majority of children experienced some form of early childhood service before starting school. The most common service was a playgroup although a significant proportion of the children had experienced home‐based care with a relative or family day care provider. The implications of the findings for the development of a policy on early childhood services are discussed. 相似文献
4.
Parenting a child with Attention Deficit Hyperactivity Disorder (ADHD) is a challenging experience. The hyperactivity, impulsivity and inattention of a child with ADHD often put parenting skills to the test. The present study thus aimed to explore the experiences of parents of children with ADHD in Ireland. Eighteen parents of 7–12-year-old boys with a diagnosis of ADHD took part in open-ended interviews. Thematic analysis was carried out on the interview content. Six major themes were identified: (1) getting your head around ADHD; (2) the child takes over; (3) emotional impact; (4) inconsistency of structural supports; (5) ignorance and discrimination; and (6) it's not all bad. Results are discussed in terms of the need to implement family-centred supports for ADHD. The importance of educating the population at large about ADHD is also discussed. Finally, the need to take a more positive, strengths-based approach to ADHD is highlighted. 相似文献
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The ‘T‐MEDIA’ project analysed and documented how teachers exploit the use of projection technologies – data projectors and interactive whiteboards (IWBs) – to support learning in secondary‐school subject lessons. The research involved collaboration between university researchers and four pairs of UK teachers (of English, mathematics, science and history) in an intensive process of systematically analysing video recordings of classroom activity and other data in depth. Our goals were to assist teachers in articulating the pedagogical rationale underlying their practice, and uniquely, to engage them in theory building about strategic technology use. This paper reports on a follow‐up study carried out one year after the collaborative analyses in order to assess the subsequent impacts of the process of critical reflection. The eight teachers were questioned using a semi‐structured interview technique that allowed us to elicit structured and personalised accounts of impact on pedagogical thinking and practice and the supporting or constraining factors. The findings suggest that for at least some, the sociocultural theory introduced and reformulated during the analyses provided a powerful analytical lens upon emerging practices, including those not incorporating technology. All of the participants reported lasting effects upon their own thinking and, except where external constraints operated, on teaching practices. The approaches developed during T‐MEDIA had additionally been disseminated to and adapted by other subject colleagues. The study illustrates how collaborative analysis of lesson videos can be used to engage teachers in deep reflection, critique and debate. This approach supports the development of an analytical scrutiny of classroom teaching and offers a significant professional development opportunity. In particular, under conditions of sensitive support, teachers will readily accommodate theoretical constructs into specific areas of professional thinking and practice. 相似文献
6.
David Hennessy 《Community College Journal of Research & Practice》2013,37(4):261-275
ABSTRACT The Writing Across the Curriculum (WAC) movement, which swept through all levels of American education during the 1960s and 1970s, seemed a logical remedy for student writing deficiencies. However, the impact of WAC has not lived up to its promise. The WAC movement, as currently implemented in many community colleges, may be ineffective at best. To significantly improve student writing, systemic reform in pedagogical practice in English composition courses and throughout the disciplines is imperative. With no reform, we may unintentionally rob writing of its ability to be a tool for learning, thus negating the movement's primary goal. This article provides an historical perspective of writing across the curriculum, alongside a suggested reform model that includes essential components. 相似文献
7.
Research Findings: The aim of this longitudinal study was to explore peer relationships across the transition from preschool to school. Participants were 35 (17 male) children attending the Irish preschool initiative Early Start (M age = 49.31 months). Sociometric measures were employed on two occasions: at the end of preschool and in the first year of school. Results indicated that most preschoolers (83%) had at least one mutual friend, and by school age all children had at least one mutual friend. Almost one third (29%) of preschools and school-age children had a mutual best friend. Notably, all children made new friends in school. In addition, a number of friendships (18%) survived the preschool to school transition. Correlational analysis also suggested some stability in peer relationships from preschool into the first year of school. Exploratory multiple regression analyses showed that preschool peer variables predicted friendship status and social preference in school. Furthermore, best friendship in preschool uniquely predicted friendship in school, and best friend status in school was uniquely associated with social preference in school. Practice: Results have implications for parents' and early educators' promotion of children's friendships during the transition from preschool to school. 相似文献
8.
Eilis Hennessy Rosario Hernandez Patricia Kieran Henry MacLoughlin 《Teaching in Higher Education》2013,18(6):675-689
Within modular degrees it is sometimes possible for students to broaden their education by taking modules from outside their main programme of study. This is one significant aspect of modular degrees which has not been studied. In an effort to better understand this issue, the research reported in this paper explored the experiences: (1) of students taking modules from outside their programme of study and; (2) of staff teaching modules with significant numbers of students from other programmes. In total, 820 undergraduate students responded to an on-line survey; 12 academic staff members participated in interviews. The survey focused on students’ reasons for choosing the module, their experiences of assessment and their perceptions of workload. Interviews with academic staff focused on the influence of non-programme students on teaching and assessment practices. The discussion addresses the implications of student choice and classroom diversity for teaching and assessment in modular systems. 相似文献
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