Optimization of some factors affecting the performance of query expansion     

Young Mee Chung  Jae Yun Lee 《Information processing & management》2004,40(6):29

This paper examines the factors affecting the performance of global query expansion based on term co-occurrence data and suggests a way to maximize the retrieval effectiveness. Major parameters to be optimized through experiments are term similarity measure and the weighting scheme of additional terms. The evaluation of four similarity measures tested in query expansion reveal that mutual information and Yule's Y, which emphasize low frequency terms, achieve better performance than cosine and Jaccard coefficients that have the reverse tendency. In the evaluation of three weighting schemes, similarity weight performs well only with short queries, whereas fixed weights of approximately 0.5 and similarity rank weights were effective with queries of any length. Furthermore, the optimal similarity rank weight achieving the best overall performance seems to be the least affected by test collections and the number of additional terms. For the efficiency of retrieval, the number of additional terms needs not exceed 70 in our test collections, but the optimal number may vary according to the characteristics of the similarity measure employed.  相似文献   

Using A Split-ballot Survey to Explore the Robustness of the 'MIP' Question in Agenda-Setting Research: A Methodological Study     

Min  Young; Ghanem  Salma I.; Evatt  Dixie 《Int. Journal of Public Opinion Research》2007,19(2):221-236

Three aspects of the ‘most important problem’ questionused in agenda-setting research to measure issue salience amongthe public were examined. A split-ballot design in a state-widesurvey compared versions of the public agenda with a socialframe of reference versus a personal frame of reference, versionsusing the traditional term ‘problem’ versus ‘issue’,and the effects of question order. High correlations betweenthe different versions were found in all three sets of comparisons.  相似文献   

Increasing learner participation     

Marsha Young 《Performance Improvement》1982,21(4):7-10

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Leveraging microgrants to support capacity-building workshops in low- and middle-income countries for meeting the Sustainable Development Goals     

Karin J. Saric  Masimba Muziringa  Erin R. B. Eldermire  Sarah Young  Israel M. Dabengwa 《Journal of the Medical Library Association》2022,110(1):126

Twenty fifteen marked the year of assessment for the Millennium Development Goals (MDGs). The MDGs that achieved the greatest success were those where evidence-based practice (EBP) interventions were implemented. The ability to practice evidence-based medicine is grounded in the creation of and access to medical literature that synthesizes research findings. The role that global health literature played in the success of the MDGs demonstrates that medical libraries and librarians have a role to play in achieving the Sustainable Development Goals (SDGs).Librarians can hold capacity-building workshops that provide instruction on how to access evidence-based literature and also train health professionals to conduct synthesis research. Research findings conducted by in-country health professionals are more likely to address issues being faced by local communities and will afford the possibility of obtaining the necessary evidence-based answers that can then be used to implement policies to resolve public health issues identified in the SDGs.This paper discusses how an international team of librarians leveraged funding from a Medical Library Association/Librarians without Borders/Elsevier Foundation/Research4Life grant to hold a capacity-building workshop in Zimbabwe and follow-up online trainings. The workshop focused on accessing evidence-based resources and conducting synthesis research. Outcomes included the creation and policy implementation of evidence-based knowledge products in alignment with local needs and galvanizing a multisectoral group of key individuals who have gone on to collaborate toward the vision of creating a Zimbabwe innovation hub. Looking ahead, such grants can be leveraged to conduct capacity-building to support knowledge translation and other local training needs.  相似文献   

河南省城镇居民体育消费结构分析   总被引：12，自引：0，他引：12  

王勇 《山东体育学院学报》2003,19(2):81-84

采用问卷调查法，对河南省城镇居民体育消费行为进行调查。结果显示，河南省居民体育消费能力低于全国水平，实物性体育消费占主导地位，观赏性体育消费相对滞后，参与性体育消费有快速增长势头。提出发展河南省城镇居民体育消费的对策。  相似文献   

Escaping the “Time Bind”: Negotiations of Love and Work in Jayne Ann Krentz's “Corporate Romances”     

Erin S. Young 《Journal of American culture (Malden, Mass. : 2003)》2010,33(2):92-106

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A prospective examination of the impact of high levels of exercise training on sedentary behaviour     

Ann M. Swartz  Nora E. Miller  Young IK Cho  Whitney A. Welch  Scott J. Strath 《European Journal of Sport Science》2017,17(2):222-230

The aim of this study is to determine changes in sedentary behaviour in response to extensive aerobic exercise training. Participants included adults who self-selected to run a marathon. Sedentary behaviour, total activity counts and physical activity (PA) intensity were assessed (Actigraph GT3X) for seven consecutive days during seven assessment periods (?3, ?2, and ?1 month prior to the marathon, within 2 weeks of the marathon, and +1, +2, and +3 months after the marathon). Models were fitted with multiple imputation data using the STATA mi module. Random intercept generalized least squares (GLS) regression models were used to determine change in sedentary behaviour with seven waves of repeated measures. Results: Twenty-three individuals (mean?±?S_x: 34.4?±?2.1y, 23.0?±?1.9% fat, 15 women, 8 men) completed the study. Marathon finishing times ranged from 185 to 344 minutes (253.2?±?9.6 minutes). Total counts in the vertical axis were 1,729,414 lower one month after the race, compared with two months prior to the race (peak training). Furthermore, counts per minute decreased by 252.7 counts·minute^?1 during that same time period. Daily sedentary behaviour did not change over the seven assessment periods, after accounting for age, gender, per cent body fat, wear time, marathon finishing time, and previous marathon experience. This prospective study supports the notion that PA and sedentary behaviours are distinct, showing that sedentary behaviour was not impacted by high levels of aerobic training.  相似文献   

A review of stereo-chemistry     

Stewart Woodford Young 《Journal of The Franklin Institute》1895,139(1):56-69

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Tests of caustic magnesia made from magnesite from several sources     

P.H. Bates  Roy N. Young  Paul Rapp 《Journal of The Franklin Institute》1923,196(5):681-683

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Now and forever: portraits of qualitative research in Korea     

Young Chun Kim  Jeasik Cho 《International journal of qualitative studies in education》2013,26(3):355-377

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