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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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In this study the learning process of 12 Dutch novice university teachers was monitored during a five-month induction programme. The teachers were interviewed before and after the programme and were asked to fill in several email logbooks during the programme. A change process was identified, in which experiencing and experimentation played a central role. In particular, modelling by the teacher educator, the observation of video cases, reflection on these with peers and experiencing success in their own practice seemed to be important incentives that encouraged teachers to adopt and eventually implement new pedagogical approaches. On the basis of our data, we think that teachers' conceptions and teaching practice are best developed simultaneously and that the design of induction programmes should support this process. 相似文献
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While legislation is in place for the promotion of inclusive education in Serbia, the adoption of teaching practices that support diversity in schools is still lacking. This study looks at teacher perceptions of students at risk (SaR), their relationships with peers and the teachers’ own roles as sources of support, using a sample of 94 interviews with teachers analysed using qualitative content analysis. The SaR from Roma population and poor backgrounds are found to be perceived positively by their teachers, but most teachers failed to perceive their influence on the improvement of academic performance and peer relationships. Perceptions of students with disabilities varied in tone across the dimension positive-depending on the type of disability-negative. Teachers who spoke affirmatively about them expressed readiness to cooperate with parents and colleagues, emphasising the importance of socialisation. Recommendations for teacher education are discussed, including diversity awareness and encouraging more flexible understanding of teacher roles. 相似文献
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This essay explores news media coverage of two types of alleged “passing”: passing across racial lines from Black to White and across sex lines from female to male. Textual analysis of dominant print media and print media discourses produced by and/or addressed to Blacks and queers reveals prominent frames through which news consumers are invited to perceive these events. In particular, the analysis demonstrates that both dominant and marginal social groups express the desire to fix the identities of passers in a single, discrete category, although these groups wish to do so for disparate reasons. In addition, marginal groups frame passing events within broad cultural and historical contexts in contrast to the narrow contexts framed by dominant media. Comparison of race and sex passing exposes the similarities–including community consternation about the passer–and differences–including disparate focus on civil rights rather than identity issues–between Black and queer coverage of these events. Comparison of race and sex passing also exposes the way in which dominant media correlate race passing with class passing, while sex passing is correlated to sexuality passing (that is, queer passing for heterosexual). 相似文献
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Daniel C. Brouwer 《Critical Studies in Media Communication》2013,30(5):351-371
This essay demonstrates how two U.S. zines produced from 1990 to 1999 by and for gay men with HIV/AIDS—Diseased Pariah News (DPN) and Infected Faggot Perspectives (IFP)—constitute counterpublics. I demonstrate how DPN and IFP constitute counterpublics through thematization of two important forms of difference—blood status (HIV-positive or HIV-negative), and political ideology. I then specify and elaborate primary modes of corporeal expressivity in the zines—the erotic/sexual and the grotesque—to demonstrate the work that each mode does for the counterpublics. 相似文献
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This article explores how 145 photographs collected from 20 PowerPoint lectures in undergraduate psychology at 16 UK universities were integrated with lecturers’ speech. Little is currently known about how lecturers refer to the distinct types of photographs included in their presentations. Findings show that only 48 photographs (33%) included in presentation slides were referred to explicitly by exploring their features to make a point related to the lecture content, with only 14 of these used to invite student questioning. Most photographs (97 or 67%) represent a case of ‘unprobed representations’, that is, either ‘embedded’ in the talk as ‘illustrations’ of the speech topic or not referred to at all. A taxonomy of uses that lecturers made of the photographs in their slideshows was created through adapting a Peircean semiotic analysis of the photograph–speech interaction. The implications in terms of lecturer and student engagement with the photographic material are discussed, arguing the case for more Critical Semiotic Exploration of photographs in HE practice. 相似文献
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Irena Vrecar Borut Peterlin Natasa Teran Luca Lovrecic 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2015,25(1):84-89
Introduction
Over the last few years, many private companies are advertising direct-to-consumer genetic testing (DTC GT), mostly with no or only minor clinical utility and validity of tests and without genetic counselling. International professional community does not approve provision of DTC GT and situation in some EU countries has been analysed already. The aim of our study was to analyse current situation in the field of DTC GT in Slovenia and related legal and ethical issues.Materials and methods
Information was retrieved through internet search, performed independently by two authors, structured according to individual private company and the types of offered genetic testing.Results
Five private companies and three Health Insurance Companies offer DTC GT and it is provided without genetic counselling. Available tests include testing for breast cancer, tests with other health-related information (complex diseases, drug responses) and other tests (nutrigenetic, ancestry, paternity). National legislation is currently being developed and Council of Experts in Medical Genetics has issued an opinion about Genetic Testing and Commercialization of Genetic Tests in Slovenia.Conclusions
Despite the fact that Slovenia has signed the Additional protocol to the convention on human rights and biomedicine, concerning genetic testing for health purposes, DTC GT in Slovenia is present and against all international recommendations. There is lack of or no medical supervision, clinical validity and utility of tests and inappropriate genetic testing of minors is available. There is urgent need for regulation of ethical, legal, and social aspects. National legislation on DTC GT is being prepared.Key words: Direct-to-consumer genetic testing, DTC, ethics in genetics, legislation 相似文献9.
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