Learning to rank with (a lot of) word features     

Bing Bai  Jason Weston  David Grangier  Ronan Collobert  Kunihiko Sadamasa  Yanjun Qi  Olivier Chapelle  Kilian Weinberger 《Information Retrieval》2010,13(3):291-314

In this article we present Supervised Semantic Indexing which defines a class of nonlinear (quadratic) models that are discriminatively trained to directly map from the word content in a query-document or document-document pair to a ranking score. Like Latent Semantic Indexing (LSI), our models take account of correlations between words (synonymy, polysemy). However, unlike LSI our models are trained from a supervised signal directly on the ranking task of interest, which we argue is the reason for our superior results. As the query and target texts are modeled separately, our approach is easily generalized to different retrieval tasks, such as cross-language retrieval or online advertising placement. Dealing with models on all pairs of words features is computationally challenging. We propose several improvements to our basic model for addressing this issue, including low rank (but diagonal preserving) representations, correlated feature hashing and sparsification. We provide an empirical study of all these methods on retrieval tasks based on Wikipedia documents as well as an Internet advertisement task. We obtain state-of-the-art performance while providing realistically scalable methods.  相似文献   

Planning changes to health library services on the basis of impact assessment     

Urquhart C  Thomas R  Ovens J  Lucking W  Villa J 《Health information and libraries journal》2010,27(4):277-285

Background: Various methods of impact assessment for health library services exist, including a toolkit developed for the UK. The Knowledge, Resource and Information service (KRIS) for health promotion, health service commissioning and public health (Bristol area, UK) commissioned an independent team at Aberystwyth University to provide an impact assessment and evaluation of their services and to provide evidence for future planning. Objective: The review aimed to provide an action plan for KRIS through assessing the impact of the current service, extent of satisfaction with existing services and views on desirable improvements. Methods: Existing impact toolkit guidance was used, with an adapted impact questionnaire, which was distributed by the KRIS staff to 244 users (response rate 62.3%) in early 2009. The independent team analysed the questionnaire data and presented the findings. Results: Users valued the service (93% considered that relevant information was obtained). The most frequent impacts on work were advice to patients, clients or carers, and advice to colleagues. Literature searching and current awareness services saved staff time. Many users were seeking health promotion materials. Conclusion: The adapted questionnaire worked well in demonstrating the service impacts achieved by KRIS, as well as indicating desirable improvements in service delivery.  相似文献   

A Cross‐Cultural Comparison of East Asian and American Higher Education Criminal Justice Student Learning Preferences Using the VARK Questionnaire     

James R. McKean  Shannon M. Brogan  Jason S. Wrench 《Journal of Criminal Justice Education》2013,24(3):272-291

The purpose of this quantitative study was to examine the relationship between learning preferences of East Asian and American higher education students. A review of the literature revealed a body of qualitative studies suggesting a stereotypical perception of an Asian learning preference influenced by cultural variables and the historical roots of Confucianism. The pedagogical implications of this stereotypical perception are obvious to faculty engaged in teaching and learning with Asian international students in America or abroad. The authors surveyed 233 higher education students from Hong Kong and America using the VARK Questionnaire. The authors used a two‐way contingency table analysis and chi‐square statistical tests to conduct their cross‐cultural comparison on their variables of interest including age, gender, and country.  相似文献   

Drunk and Alone in a K‐Mart Parking Lot: The Pedagogy of Simulations and Contemporary Attitudes Toward Drinking and Driving     

Matthew S. Crow  Richard M. Hough  Sr Jason Mosley  John Ortiz Smykla  Kimberly M. Tatum 《Journal of Criminal Justice Education》2013,24(3):417-431

This article introduces readers to the philosophy and design of team-based learning (TBL), a method developed by Dr. Larry Michaelsen that was influenced by literature in organizational psychology and pedagogy documenting what actually motivates adults to learn and how they master higher order learning skills. We describe how TBL was implemented in several criminal justice courses and illustrate how this method has drastically reduced student apathy, increased attendance, improved performance, and eliminated frustration for both instructors and students. Additionally, we reflect on how this method has reshaped our roles as educators.  相似文献   

After the crime: the power of restorative justice dialogues between victims and violent offenders     

Jason Dobrow 《Journal of Criminal Justice Education》2013,24(4):550-552

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Resampling and Distribution of the Product Methods for Testing Indirect Effects in Complex Models     

Jason Williams  David P. MacKinnon 《Structural equation modeling》2013,20(1):23-51

Recent advances in testing mediation have found that certain resampling methods and tests based on the mathematical distribution of 2 normal random variables substantially outperform the traditional z test. However, these studies have primarily focused only on models with a single mediator and 2 component paths. To address this limitation, a simulation was conducted to evaluate these alternative methods in a more complex path model with multiple mediators and indirect paths with 2 and 3 paths. Methods for testing contrasts of 2 effects were evaluated also. The simulation included 1 exogenous independent variable, 3 mediators and 2 outcomes and varied sample size, number of paths in the mediated effects, test used to evaluate effects, effect sizes for each path, and the value of the contrast. Confidence intervals were used to evaluate the power and Type I error rate of each method, and were examined for coverage and bias. The bias-corrected bootstrap had the least biased confidence intervals, greatest power to detect nonzero effects and contrasts, and the most accurate overall Type I error. All tests had less power to detect 3-path effects and more inaccurate Type I error compared to 2-path effects. Confidence intervals were biased for mediated effects, as found in previous studies. Results for contrasts did not vary greatly by test, although resampling approaches had somewhat greater power and might be preferable because of ease of use and flexibility.  相似文献   

Robots Teaching Other Little Robots: Neoliberalism,CCSS, and Teacher Professionalism     

Jason L. Endacott  Ginney P. Wright  Christian Z. Goering  Vicki S. Collet  George S. Denny  Jennifer Jennings Davis 《Review of Education, Pedagogy & Cultural Studies》2013,35(5):414-437

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Relationships Among Cortical Thickness,Reading Skill,and Print Exposure in Adults     

Jason G. Goldman  Frank R. Manis 《Scientific Studies of Reading》2013,17(3):163-176

This study investigated relationships among cortical thickness in the left-hemisphere reading network, and reading skill and experience in adult nonimpaired readers. Given the relationship between print exposure and reading, it is possible that print exposure is related to cortical structure. The pattern of correlations indicated that individuals with higher print exposure had better reading skills and thicker cortices. Furthermore, print exposure accounted for unique variance in cortical thickness in part of the left-hemisphere reading network after accounting for reading skill. This suggests that some of the variation in cortical thickness in adults might be attributable to reading experience, independently of reading skill.  相似文献   

Using the I² Intervention Matrix to Select the Best Course of Action     

Jason Paul Siko 《Performance Improvement》2013,52(10):23-26

The I² intervention selection matrix is a useful tool that will help in the selection of appropriate interventions based on the level of impact and invasiveness of the intervention. It is a two‐axis grid that places interventions in one of four quadrants. Based on which quadrant the intervention falls in, a practitioner can decide which interventions to use, not use, or use with caution. It is a simple yet elegant way to determine appropriateness.  相似文献   

Islands of Detroit: Affect,Nostalgia and Whiteness     

Jason Sperb 《Culture, Theory & Critique》2013,54(2):183-201

Abstract

‘Islands of Detroit’ explores the possibilities for an ‘everyday, oppositional whiteness’, a thoughtful randomness, as a corrective to ‘reactionary’ and ‘evasive’ forms of whiteness which often embed themselves in populist media sites for nostalgia. Drawing on the theoretical work of Svetlana Boym, Uday Singh Mehta and Roland Barthes, this essay looks in particular at a coffee table book, The Way it Was (2004 Bulanda, G., ed. 2004. The Way It Was: Glimpses of Detroit’s History from the Pages of Hour Detroit Magazine, Royal Oak, MI: Momentum.  [Google Scholar]), and its generic sentimentalism, to understand how certain white visual representations of Detroit affectively generate nostalgia, which can in turn conceal pasts and racial tensions. Looking at the history of Detroit (with particular attention on how the two infamous race riots are and are not negotiated), Islands examines visual images of the city – as opposed to the city itself – through the discursive lenses of nostalgia, modernity and affect, while positing that the histories and identities of Detroit remain irreducible to the images which attempt to capture them.  相似文献