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981.
This paper comprehensively reviews the CAL literature before reporting on a study of student and lecturer take-up of the Learning Resource Web (LRW), within the Bristol Business School. The study was multimethod, incorporating a survey of student expectations (n=394) and qualitative interviews with teaching staff (n=12). The LRW initially supported teaching in the sciences. Its implementation in the Business School raised questions about the support it might offer for active and experiential pedagogies. Lecturers tended to use the LRW as an aid to course management, but also saw it as a catalyst for pedagogic change and, in particular, the development of independent learning skills amongst undergraduates. By contrast, students welcomed the system because it appeared to provide a learning safety-net. The study highlights tentative signs that, because of this, the introduction of the LRW may be promoting the instrumentality and dependence on exposition that lecturers often seek to counteract. 相似文献
982.
983.
Weihua Zhou 《Publishing Research Quarterly》2008,24(1):32-39
In China, educational publishing is devoted to publishing mainly textbooks and teaching materials. For a long time, education
publishing has dominated others in China’s publishing industry. However, after entering the new century, especially in the
last 2 years, there has been the impact of changes in the College-Entrance Examination, the Invitation to Bid for Compilation
and Publication of Textbooks, government procurement and Scientific and Technological Advancement for supplementary books.
Therefore, publishing for education has been losing its previous major role and dominance. For making a leap forward and breakthrough
in educational publication, we must open up a new train of thought for the development of educational publishing, we need
three distinct transformations: first, change in publishing mode from extensive to intensive growth. Second, transformation
from variety-scale to market-scale expansion. Third, transformation from being just a provider of content to one providing
both content and services. 相似文献
984.
Andreas Veglis 《Publishing Research Quarterly》2008,24(2):111-123
This paper attempts a direct comparison of the available alternative channels that can be employed in a cross media publishing
scheme. More precisely it examines the content, the publishing speed, and the rhythm of the publishing channels. Interesting
conclusions are drawn concerning the characteristics of each channel. A new publishing channel is proposed in order to allow
newspapers to directly compete with radio and TV channels. 相似文献
985.
Features for image retrieval: an experimental comparison 总被引:6,自引:0,他引:6
986.
Negation recognition in medical narrative reports 总被引:1,自引:0,他引:1
Substantial medical data, such as discharge summaries and operative reports are stored in electronic textual form. Databases
containing free-text clinical narratives reports often need to be retrieved to find relevant information for clinical and
research purposes. The context of negation, a negative finding, is of special importance, since many of the most frequently
described findings are such. When searching free-text narratives for patients with a certain medical condition, if negation
is not taken into account, many of the documents retrieved will be irrelevant. Hence, negation is a major source of poor precision
in medical information retrieval systems. Previous research has shown that negated findings may be difficult to identify if
the words implying negations (negation signals) are more than a few words away from them. We present a new pattern learning
method for automatic identification of negative context in clinical narratives reports. We compare the new algorithm to previous
methods proposed for the same task, and show its advantages: accuracy improvement compared to other machine learning methods,
and much faster than manual knowledge engineering techniques with matching accuracy. The new algorithm can be applied also
to further context identification and information extraction tasks.
相似文献
Lior RokachEmail: |
987.
Document length is widely recognized as an important factor for adjusting retrieval systems. Many models tend to favor the
retrieval of either short or long documents and, thus, a length-based correction needs to be applied for avoiding any length
bias. In Language Modeling for Information Retrieval, smoothing methods are applied to move probability mass from document
terms to unseen words, which is often dependant upon document length. In this article, we perform an in-depth study of this
behavior, characterized by the document length retrieval trends, of three popular smoothing methods across a number of factors,
and its impact on the length of documents retrieved and retrieval performance. First, we theoretically analyze the Jelinek–Mercer,
Dirichlet prior and two-stage smoothing strategies and, then, conduct an empirical analysis. In our analysis we show how Dirichlet
prior smoothing caters for document length more appropriately than Jelinek–Mercer smoothing which leads to its superior retrieval
performance. In a follow up analysis, we posit that length-based priors can be used to offset any bias in the length retrieval
trends stemming from the retrieval formula derived by the smoothing technique. We show that the performance of Jelinek–Mercer
smoothing can be significantly improved by using such a prior, which provides a natural and simple alternative to decouple
the query and document modeling roles of smoothing. With the analysis of retrieval behavior conducted in this article, it
is possible to understand why the Dirichlet Prior smoothing performs better than the Jelinek–Mercer, and why the performance
of the Jelinek–Mercer method is improved by including a length-based prior.
相似文献
Leif AzzopardiEmail: |
988.
Evan Schnittman 《Publishing Research Quarterly》2008,24(2):139-142
Search engine discoverability programs have changed the fundamentals of book marketing by enabling content inside the book
to be used as the source of marketing itself via search results inside books. The internet trifecta of search, browse, buy
is the end game but the complexities of making this work is explored along with an in-depth overview of the potential upside
and difficulties of online content purchase models. 相似文献
989.
990.
Experimentation and Innovation in U.S. Publishing Today: Findings from the Book Industry Study Group
Michael Healy 《Publishing Research Quarterly》2008,24(4):233-239
In February 2008 the Book Industry Study Group (BISG) conducted a survey of U.S. publishers to determine the extent of technology-driven
innovation and experimentation. The survey findings were published alongside a set of 10 case studies in May 2008 as “From
experimentation to innovation in the digital age—case studies from the North American Book Industry 2008”. This article, written
by Michael Healy, Executive Director of the BISG, summarizes the circumstances that led to the survey and shares the key findings. 相似文献