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Dustin Hillard Eren Manavoglu Hema Raghavan Chris Leggetter Erick Cantú-Paz Rukmini Iyer 《Information Retrieval》2011,14(3):315-336
The critical task of predicting clicks on search advertisements is typically addressed by learning from historical click data.
When enough history is observed for a given query-ad pair, future clicks can be accurately modeled. However, based on the
empirical distribution of queries, sufficient historical information is unavailable for many query-ad pairs. The sparsity
of data for new and rare queries makes it difficult to accurately estimate clicks for a significant portion of typical search
engine traffic. In this paper we provide analysis to motivate modeling approaches that can reduce the sparsity of the large
space of user search queries. We then propose methods to improve click and relevance models for sponsored search by mining
click behavior for partial user queries. We aggregate click history for individual query words, as well as for phrases extracted
with a CRF model. The new models show significant improvement in clicks and revenue compared to state-of-the-art baselines
trained on several months of query logs. Results are reported on live traffic of a commercial search engine, in addition to
results from offline evaluation. 相似文献
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Caroline Dyer Archana Choksi Vinita Awasty Uma Iyer Renu Moyade Neerja Nigam 《比较教育学》2002,38(3):337-351
This paper argues for the need to adopt a more participatory and research-based approach to teacher development in India. Drawing on the experiences of a participatory teacher educator development project in three States, we discuss processes of developing a democratically orientated qualitative research team to work with teachers and teacher educators, highlighting the interplay between their education and socialisation and the demands of the methodology. In the second part of the paper, aspects of developing collaborative action research projects with teacher educators in the context of District Institutes of Education and Training are discussed. Both these approaches require the development of autonomy and critical reflexivity, and although there are tensions in this process, these emerge as vital components of developing a more democratic approach to teacher education. 相似文献
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Shah Veenita Murthy Sahana Warriem Jayakrishnan Sahasrabudhe Sameer Banerjee Gargi Iyer Sridhar 《Educational technology research and development : ETR & D》2022,70(1):263-288
Educational technology research and development - MOOCs support the global need of learning resources with large impact through online access and no geographical boundaries. However, pedagogical... 相似文献
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Amy Diehl Jeffrey T. Grabill William Hart-Davidson Vishal Iyer 《Technical Communication Quarterly》2013,22(4):413-434
This article introduces a simple mapping tool called Grassroots, a software product from a longitudinal study examining the use of information communication technologies and knowledge work in communities. Grassroots is an asset-based mapping tool made possible by the Web 2.0 movement, a movement which allows for the creation of more adaptable interfaces by making data and underlying database structures more openly available via syndication and open source software. This article forwards three arguments. First is an argument about the nature of the knowledge work of everyday life, or an argument about the complex technological and rhetorical tasks necessary to solve commonplace problems through writing. Second is an argument about specific technologies and genres of community-based knowledge work, about why making maps is such an essential genre, and about why making asset maps is potentially transformative. Third is an argument about the making of Grassroots itself; a statement about how we should best express, test, and verify our theories about writing and knowledge work. 相似文献
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Although schools have been identified as important settings in which young people's sexual and reproductive health (SRH) can be promoted, there has been limited research into the role of teachers in delivering sex education programmes. This paper describes findings from a qualitative study of teachers' beliefs and attitudes towards young people's SRH in a Ugandan secondary school, and discusses the ways in which conservative attitudes to young people's sexual activity and an adherence to gender stereotypes can limit students' access to SRH information and services. Teachers' attitudes, beliefs and often superstitions relating to young people's sexual activity inevitably affect the content and nature of school-based sex education. Findings from this preliminary study suggest that, rather than assuming teachers act as neutral delivery mechanisms in schools, these attitudes and beliefs must be taken into consideration and addressed in the development of school-based sex education programmes. 相似文献
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Chaos is a type of complicated behaviour found in non-linear dynamical systems. Computers are playing an important role in the growth of this science. 相似文献
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Radha Iyer 《Literacy》2007,41(3):161-168
Critical literacy has been a particular focus in literacy education in the past two decades. Literacy models such as the ‘four resources’ model provide a significant framework for a critical understanding of texts and the social and cultural practices that inform them. In this paper, I draw on the ‘four resources’ model to argue that the success of the framework in developing critical literacy depends upon focusing adequate analytic attention on those subjectivities used in such practices. The intersubjective classroom dynamics and the subjective engagement of literacy practitioners are of equal importance in determining the meanings co‐constructed among subjects. I argue that beyond being text analysts, reflective practitioners, that is the teacher, and students as a group, can engage in postcritical negotiations of the text, contribute to new meaning possibilities and adopt an ongoing critical stance. Applying this literacy model successfully requires acceptance of a multiplicity of interpretations, collaborative practice between teachers and students and fluid subject positions. The paper concludes by considering the problematic of the classroom as a dynamic site for textual and cultural contestation of multiple perspectives. 相似文献
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Padmini Iyer 《Gender and education》2019,31(2):222-239
This paper explores young people’s understandings of gender and sexual violence in New Delhi, India, based on multi-method research conducted with young people (aged 15–17) in three co-educational secondary schools. Fieldwork took place shortly after the 2012 Delhi gang rape that sparked widespread debates about violence against women in India, and so sexual violence became an important frame for students’ discussions around gender and sexuality. Young people’s understandings are considered within gender narratives – of ‘can-do’ and ‘vulnerable’ girlhood, and of ‘hero’ and ‘good boy’ masculinities – which already shaped their day-to-day experiences of schooling. Findings suggest that tensions arising from these often contradictory narratives led to frustrations among girls, while the dominance of conversations about sexual violence led to confusions in both girls’ and boys’ understandings of sexuality. Reflections are offered on ways schools can better support young people as they learn about gender and sexuality from diverse and contradictory sources. 相似文献