共查询到20条相似文献，搜索用时 31 毫秒
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Background
Systematic reviews risk producing biased conclusions if a comprehensive search to identify eligible studies is not undertaken, but little evidence exists to guide prioritisation of databases to search when resources are limited.Objectives
A systematic review examining interventions for managing frozen shoulder (adhesive capsulitis) was used to investigate the performance of bibliographic databases in identifying the included studies, the smallest combination of databases required to retrieve all included studies, and the performance of the searches themselves.Methods
We calculated the yield of included studies from each of 15 databases, and the recall and precision of each search strategy. We investigated differences between the presence of a record in a database and its retrieval.Results
Thirty of 31 studies were present in at least one database. Yields of individual databases ranged from 0% to 90% (median 23%). Two combinations of databases identified all 30 studies: Cochrane Central Register of Controlled Trials (CENTRAL) and Science Citation Index (SCI); or CENTRAL, MEDLINE and PreMEDLINE.Conclusions
In a systematic review of a range of interventions used to manage frozen shoulder, at least two databases and reference checking were required to retrieve all included studies, but searching for future reviews should not be restricted. 相似文献5.
The authors of this paper investigated the impact of the advanced search features of three common search engines on retrieval result performance: Yahoo, Google, and Live Search. The authors analyzed 240 search queries with different information need emphases to determine retrieval effectiveness differences among regular search, title search, exact phrase search, and PDF file format restriction search. A one-way ANOVA method and regression analysis method were used for the study. It was found that the PDF file format restriction search achieved the best retrieval performance among Yahoo, Google and Live Search. The regular search achieved the best web page ranking performance among Yahoo, Google, and Live Search. The findings of this study can be used to assist users in formulating an appropriate search strategy to improve search effectiveness, and to shed light on how search engines react to different types of search features in terms of retrieval effectiveness. 相似文献
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The authors of this paper investigated the impact of the advanced search features of three common search engines on retrieval result performance: Yahoo, Google, and Live Search. The authors analyzed 240 search queries with different information need emphases to determine retrieval effectiveness differences among regular search, title search, exact phrase search, and PDF file format restriction search. A one-way ANOVA method and regression analysis method were used for the study. It was found that the PDF file format restriction search achieved the best retrieval performance among Yahoo, Google and Live Search. The regular search achieved the best web page ranking performance among Yahoo, Google, and Live Search. The findings of this study can be used to assist users in formulating an appropriate search strategy to improve search effectiveness, and to shed light on how search engines react to different types of search features in terms of retrieval effectiveness. 相似文献
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Query recommendation has long been considered a key feature of search engines, which can improve users’ search experience by providing useful query suggestions for their search tasks. Most existing approaches on query recommendation aim to recommend relevant queries, i.e., alternative queries similar to a user’s initial query. However, the ultimate goal of query recommendation is to assist users to reformulate queries so that they can accomplish their search task successfully and quickly. Only considering relevance in query recommendation is apparently not directly toward this goal. In this paper, we argue that it is more important to directly recommend queries with high utility, i.e., queries that can better satisfy users’ information needs. For this purpose, we attempt to infer query utility from users’ sequential search behaviors recorded in their search sessions. Specifically, we propose a dynamic Bayesian network, referred as Query Utility Model (QUM), to capture query utility by simultaneously modeling users’ reformulation and click behaviors. We then recommend queries with high utility to help users better accomplish their search tasks. We empirically evaluated the performance of our approach on a publicly released query log by comparing with the state-of-the-art methods. The experimental results show that, by recommending high utility queries, our approach is far more effective in helping users find relevant search results and thus satisfying their information needs. 相似文献
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Grant MJ 《Health information and libraries journal》2004,21(1):21-32
The objective was to gain an overview of researchers experiences of searching the literature, with particular reference to the use of optimal search strategies (OSSs) and searching for qualitative research studies. A 13-item semi-structured questionnaire investigating search behaviour was distributed to members of the Cochrane Qualitative Methods Network. Follow-up interviews were conducted with a subset of respondents to explore issues raised and clarify points of ambiguity. Findings were analysed using data reduction, data displays and verification techniques. Eighty-six per cent of distributed questionnaires were returned. All respondents reported searching electronic databases as part of their literature search, with 80% expressing a preference for searching alone or with colleagues. Forty-one per cent indicated that they consider a database search to be only one aspect of a comprehensive literature search. The rigour and availability of OSSs was a concern for 30% of respondents. Twenty-five per cent of respondents had searched for qualitative studies, although the difficulty of locating this type of literature was considered problematic because of the varied use of the term 'qualitative'. Whilst the majority of respondents reported using OSSs in some capacity, reservations were expressed about their ability to facilitate a comprehensive search. Replies indicated a belief that OSSs can reduce the sensitivity of a search, and might limit the breadth of coverage required. A greater appreciation of the availability and purpose of OSSs-including the ability to optimize either sensitivity or recall-is needed if this enhanced approach to accurate data retrieval and potential improvement in time management is to become widespread. 相似文献
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Do published search filters to identify diagnostic test accuracy studies perform adequately? 总被引：1，自引：0，他引：1
OBJECTIVES: To assess the performance of published search filters in finding diagnostic test accuracy studies. METHODS: Diagnostic test accuracy search filters were identified by searching medline, our own files and by requesting unpublished filters from colleagues. We applied the filters to a case study review of diagnostic test accuracy studies for urinary tract infections (UTI) in young children. The included studies with records in medline formed the gold standard. The performance of the filters in finding those gold standard records was assessed. RESULTS: We identified twenty-three diagnostic test accuracy search filters for use with medline. The case study systematic review of UTI included 179 studies of diagnostic test accuracy, of which 160 were available in medline. The filters showed a wide range of sensitivities (range: 20.6% to 86.9%) and precision (range: 1% to 9.4%). CONCLUSIONS: Our results broadly support those reported in two other studies. The search filters tested do not offer an adequate trade-off between sensitivity and precision to be used to identify studies for systematic reviews. However, there are methods available to explore whether search filters are viable based on an objective statistical analysis of the text and indexing used in records. 相似文献
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Modern information retrieval systems use several levels of caching to speedup computation by exploiting frequent, recent or costly data used in the past. Previous studies show that the use of caching techniques is crucial in search engines, as it helps reducing query response times and processing workloads on search servers. In this work we propose and evaluate a static cache that acts simultaneously as list and intersection cache, offering a more efficient way of handling cache space. We also use a query resolution strategy that takes advantage of the existence of this cache to reorder the query execution sequence. In addition, we propose effective strategies to select the term pairs that should populate the cache. We also represent the data in cache in both raw and compressed forms and evaluate the differences between them using different configurations of cache sizes. The results show that the proposed Integrated Cache outperforms the standard posting lists cache in most of the cases, taking advantage not only of the intersection cache but also the query resolution strategy. 相似文献
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Jarrett M. Drake 《档案与原稿》2013,41(2):270-279
ABSTRACTAustralian and US-based archivists have recently begun to confront their complicity in a documentary landscape that excludes and erases the voices and views of minority, oppressed and poor communities. Archival professional organisations in both countries attempt to confront this issue by focusing on the homogeneity of the profession, specifically through using the discourse of diversity. Thus, this keynote address, delivered at the 2017 conference of the Australian Society of Archivists in Melbourne, explores the following question: how, if at all, does diversity form part of the solution for dismantling the white supremacy of archives? It begins this inquiry by recounting the author’s participation and experience with diversity projects of the Society of American Archivists, before speculating how archivists might transition away from the language of diversity and towards the language of liberation through the concept of an archive of the oppressed. The central argument of the address is that dismantling white supremacy in archives requires archivists abandon the neoliberal discourse of diversity and adopt an archive of the oppressed, or a cooperative approach in which oppressed peoples are positioned as subjects in our own liberation. 相似文献
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Viviane Frings-Hessami 《档案与原稿》2018,46(2):158-173
The historical records created by Australian child welfare agencies were never intended to be released to the children after they left ‘care’. They were administrative records that were compiled for the agencies’ own use, not to meet the needs of the children or their adult selves. What happened after records were released to Care Leavers and reused by them is not what the agencies intended to happen. The author argues that this cannot be adequately mapped onto the Records Continuum Model and proposes a Repurposed Archive Continuum Model to represent the processes involved when Care Leavers are attempting to access their records. 相似文献
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《Journal Of Archival Organization》2013,11(2):5-40
Abstract Many archivists believe that outreach is an important part of their job. However, how do archivists define the term outreach? How does outreach compare to basic services? What types of outreach programs are being done? This article reports the results of a survey that asked college and university archivists to answer these and similar questions. The author describes the respondents' answers, compares their opinions about outreach and basic services, and reports the types of outreach programs that are done. The article concludes with a new and more inclusive definition of outreach that is based on the respondents' answers. 相似文献
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《The Reference Librarian》2013,54(27-28):141-160
Serials represent a growing proportion of published literature and budget allocations. Since serials frequently contain the most current information and latest reports of research activity, they both generate many reference questions and supply the answers. Due to the continuing and changing nature of serials, their records are more difficult to interpret than are monograph records. The philosophy underlying the creation of serial records, the variations in serial cataloging rules, and the effects of automation partially explain what appears in our catalogs. A review of the essential elements in serial bibliographic records accents the unique characteristics of serials and the problems encountered in trying to create records that are consistent and intelligible. 相似文献
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Vicki Mayer 《传播与批判/文化研究》2013,10(2-3):291-294
These words critique the ongoing tendency to create false dichotomies between different approaches in media studies. Delivered as part of a panel on the future of media studies at the 2013 Society for Cinema and Media Studies, I offer a definition of critique that all critical media scholars should share. 相似文献
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Lis Howell 《Journalism Practice》2017,11(9):1062-1078
Four times as many males as females appeared as experts on flagship television and radio news programmes in the United Kingdom as of the early 2010s. This study draws on four complementary sets of data to explore the reasons behind this disparity. The findings point to a combination of journalists’ news production processes and women’s perceptions of appropriate social norms and roles. A high proportion of woman experts surveyed lack confidence, saying they fear they will be perceived as self-promoting and “pushy” for wanting to appear on air. Broadcast journalists report women need to be persuaded and wooed, acting like “princesses” and therefore making male experts less trouble to recruit. 相似文献