Measuring Search Engine Quality   总被引：12，自引：3，他引：9  

David Hawking  Nick Craswell  Peter Bailey  Kathleen Griffihs 《Information Retrieval》2001,4(1):33-59

The effectiveness of twenty public search engines is evaluated using TREC-inspired methods and a set of 54 queries taken from real Web search logs. The World Wide Web is taken as the test collection and a combination of crawler and text retrieval system is evaluated. The engines are compared on a range of measures derivable from binary relevance judgments of the first seven live results returned. Statistical testing reveals a significant difference between engines and high intercorrelations between measures. Surprisingly, given the dynamic nature of the Web and the time elapsed, there is also a high correlation between results of this study and a previous study by Gordon and Pathak. For nearly all engines, there is a gradual decline in precision at increasing cutoff after some initial fluctuation. Performance of the engines as a group is found to be inferior to the group of participants in the TREC-8 Large Web task, although the best engines approach the median of those systems. Shortcomings of current Web search evaluation methodology are identified and recommendations are made for future improvements. In particular, the present study and its predecessors deal with queries which are assumed to derive from a need to find a selection of documents relevant to a topic. By contrast, real Web search reflects a range of other information need types which require different judging and different measures.  相似文献   

The Provision for Personal, Social, Health Education (PSHE) and Citizenship in School-based Elements of Primary Initial Teacher Education     

Nick Mead 《Pastoral Care in Education》2004,22(2):19-26

This small-scale research study looks at the PSHE/Citizenship framework and the opportunities for student teachers to understand and experience within school the relationship between values, personal and social development and learning. A questionnaire was given to two sets of student teachers on their final school-based placements. The research suggests that there needs to be greater recognition of the centrality of multi-cultural awareness and understanding within the political literacy section of the PSHE/Citizenship framework. This is the counterpart to a previous study of the opportunities for values education within the university-based elements of Primary Initial Teacher Education ( Mead, 2003 ).  相似文献   

Planning for the future: learning from the past     

Nick Gibbs Director of Community Services 《Cultural Trends》2004,13(3):37-39

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Public library trends     

Nick Moore 《Cultural Trends》2004,13(1):27-57

Public libraries tend to be taken for granted. They can be found in nearly every community and are used by a substantial proportion of the population, particularly the young and the old. Yet the public library service, as it is today, is a relatively recent phenomenon. Despite their origins in the mid-19th century, the widespread network of public libraries is largely the product of the post-war welfare state. The demand for the service grew rapidly during the war and in the immediate post-war period. Provision to meet the demand was constrained initially by the competing demands for reconstruction, but by 1960 the service was ready to expand. The growth was consolidated by the 1964 Public Libraries and Museums Act and was given further emphasis by the 1962 Bourdillon standards (Ministry of Education, 1962). The Act and the standards provided the impetus for what might be described as the golden age of public libraries. This brief period was brought to an abrupt end by the economic crises of the mid-1970s and the subsequent downward pressure on public expenditure. The service managed to hold its own during the late 1970s and early 1980s but since then it has been in decline, with the rate of decline accelerating during the 1990s as new requirements and increasing costs stretched diminishing resources even further, to the point where the overall level of provision now falls well short of the basic standards that were considered to be essential in the early 1960s.  相似文献   

Quality and relevance of domain-specific search: A case study in mental health     

Thanh Tin Tang  Nick Craswell  David Hawking  Kathy Griffiths  Helen Christensen 《Information Retrieval》2006,9(2):207-225

When searching for health information, results quality can be judged against available scientific evidence: Do search engines return advice consistent with evidence based medicine? We compared the performance of domain-specific health and depression search engines against a general-purpose engine (Google) on both relevance of results and quality of advice. Over 101 queries, to which the term ‘depression’ was added if not already present, Google returned more relevant results than those of the domain-specific engines. However, over the 50 treatment-related queries, Google returned 70 pages recommending for or against a well studied treatment, of which 19 strongly disagreed with the scientific evidence. A domain-specific index of 4 sites selected by domain experts was only wrong in 5 of 50 recommendations. Analysis suggests a tension between relevance and quality. Indexing more pages can give a greater number of relevant results, but selective inclusion can give better quality.  相似文献   

Library as place: results of a delphi study.   总被引：1，自引：0，他引：1  

Logan Ludwig  Susan Starr 《Journal of the Medical Library Association》2005,93(3):315-326

OBJECTIVE: An expert consensus on the future of the library as place was developed to assist health sciences librarians in designing new library spaces. METHOD: An expert panel of health sciences librarians, building consultants, architects, and information technologists was asked to reflect on the likelihood, desirability, timing, and impact on building design of more than seventy possible changes in the use of library space. RESULTS: An expert consensus predicted that the roles librarians play and the way libraries are used will substantially change. These changes come in response to changes in technology, scholarly communication, learning environments, and the health care economy. CONCLUSIONS: How health sciences library space is used will be far less consistent by 2015, as space becomes more tailored to institutional needs. However, the manner in which health sciences libraries develop and deliver services and collections will drastically change in the next decade. Libraries will continue to exist and will provide support for knowledge management and clinical trials, provide access to digital materials, and play a host of other roles that will enable libraries to emerge as institutional change agents.  相似文献   

Reinventing the public value of libraries     

Nick Field 《Public Library Quarterly》2018,37(2):113-126

ABSTRACT

Libraries worldwide have had to re-think their purpose and adapt to changing community needs and expectations. They are no longer simply repositories for old books. Rather, they are vital components of a community’s social and economic infrastructure that connects communities and fosters creativity and innovation. This paper explores the changing role of libraries—and public value organizations more broadly—in creating positive social, economic, and environmental outcomes for individuals and communities.  相似文献   

Sampling Methods and Sample Populations in Quantitative Mass Communication Research Studies: A 15-Year Census of Six Journals     

Joseph Erba  Brock Ternes  Piotr Bobkowski  Tara Logan  Yuchen Liu 《Communication Research Reports》2018,35(1):42-47

This study evaluated the sampling methods and sample populations used in all U.S.-based survey and experimental mass communication studies published between 2000 and 2014 in six major journals (N = 1,173). Most studies used nonprobability samples, and more than half used student samples. Experiments used more nonprobability and student samples than surveys. Funded studies used more probability and nonstudent samples than nonfunded studies. Implications of results pertaining to population validity and interpretations of findings for mass communication research are discussed.  相似文献   

Disciplinary containment: whiteness and the academic scarcity narrative     

Lisa A. Flores  Logan Rae Gomez 《传播与批判/文化研究》2020,17(2):236-242

ABSTRACT

Amid rising controversy around the alleged distinctions between merit and excellence lies a familiar refrain, scarcity. The narrative of academic scarcity, proclaiming the insufficient numbers of scholars and academics of color, permeates conversations in higher education. We suggest that the academic scarcity narrative, a remnant of stagnant logics of diversity, circulates as a contemporary mechanism of what we name disciplinary containment. Extending disciplinary conversations around rhetorical containment, we argue that disciplinary containment perpetuates whiteness.  相似文献   

Teach the Medium     

Nick Jaffe 《Teaching Artist Journal》2015,13(1):3-4

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