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Abstract

In 1988 the Open University is implementing a major new policy on the use of computers in its courses; students taking certain courses will be obliged to have access to a microcomputer. This new policy has many far‐reaching consequences, not least for students who are disabled. In the past most computing in Open University courses has been done by students using terminals in local study centres, linked to the University's mainframe computers. Also, a number of students who are disabled have used computers in their studies, principally for word‐processing written work. By interviewing disabled students who have taken such courses, and surveying other disabled students, it has been possible to anticipate to some extent the likely impact of the home‐computing (HC) policy. Results suggest that for many disabled‐ students the HC policy represents an improvement in their opportunities; now they will be able to study courses involving computers entirely at home. However, a number of problems have also been identified. Hopefully, as many of these have been recognised at an early stage, it will be possible to address them before they affect students directly.  相似文献   
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Outdoor education practice around the world occurs in diverse circumstances, environments and cultures. The application of outdoor education to specific cultural and environmental issues in particular places and communities has received little attention in research. While research in fields such as cultural geography has addressed the relationships between cultures, communities and geographical places, this is largely overlooked in outdoor education research. In this paper I draw on literature from cultural history and environmental history to explore how these disciplines might inform outdoor education research and pedagogy that addresses current cultural and environmental issues of specific communities and geographical places. With the aid of the rhizome metaphor for (re)structuring knowledge, I use examples from my practice in Australia to demonstrate how reading the landscape and the use of stories, or historical accounts, can assist outdoor educators and participants to probe and reflect on the relationships between personal experience and the complex cultural-ecological processes that have shaped the places in which we live and work.  相似文献   
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Abstract

Previous investigators have yielded conflicting results in testing the hypothesis that the use of toe clips during bicycle ergometry produces a higher maximal oxygen uptake ([Vdot]O 2 max) than testing without toe clips. Eight men, four competitive cyclists and four competitive distance runners volunteered to participate in three randomized [Vdot]O 2 max tests: 1) a treadmill running lest, 2) a bicycle ergometer test using standard toe clips, and 3) a test on the same ergometer without toe clips. The highest mean [Vdot]O 2 max was observed in the treadmill condition as expected. However, no statistically significant difference in mean [Vdot]O 2 max or performance time was observed between the toe-clip and no toe-clip conditions. Based on these results, the research hypothesis was rejected and no favorable physiological effect may be attributed to the use of toe clips.  相似文献   
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The article relates the experiences of one large comprehensive school in its first year as a member of a pilot Local Resource Management (LRM) scheme. It considers some of the difficulties, the training implications and some of the advantages and disadvantages which have already come to light. Some advice is also given to other schools which are likely to be involved in such schemes as soon as the ‘Baker Bill’ becomes law.  相似文献   
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‘It's important that we remember the past is not just dry facts and statistics but also the detailed lives of real people. SAPPHIRE aims to give a voice to these lives.’ The Scottish Archive of Print and Publishing History Records (SAPPHIRE), an initiative with Napier University as lead and Queen Margaret University College as main collaborative partner, is an oral history project which aims to record the social, economic and cultural heritage of the Scottish printing and publishing industry in the 20th century. Undertaken in partnership with a number of Scottish organizations, its results are providing a better understanding of an important and overlooked part of Scotland's heritage. Outcomes of the project include a permanent oral history archive stored at the Edward Clark Collection at Napier University, and exhibitions and publications on the history of the printing and publishing industry. The development and current activities of SAPPHIRE are described and reviewed.  相似文献   
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Binary Interpolative Coding for Effective Index Compression   总被引:4,自引:1,他引:4  
Information retrieval systems contain large volumes of text, and currently have typical sizes into the gigabyte range. Inverted indexes are one important method for providing search facilities into these collections, but unless compressed require a great deal of space. In this paper we introduce a new method for compressing inverted indexes that yields excellent compression, fast decoding, and exploits clustering—the tendency for words to appear relatively frequently in some parts of the collection and infrequently in others. We also describe two other quite separate applications for the same compression method: representing the MTF list positions generated by the Burrows-Wheeler Block Sorting transformation; and transmitting the codebook for semi-static block-based minimum-redundancy coding.  相似文献   
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This article explores the relevance of social engineering for the postindustrial epoch. The concept of social engineering has been dormant in recent years, stained by the behavior of police states in the 20th century. Yet stripped of its excesses, social engineering still represents a defensible moral and political enterprise. What is needed for the 21st century, however, is a chastened, deontological theory of social engineering, one that accepts the inviolability of the person while still pursuing ambitious long-term teleological strategies through state action. For its content, progressive information society policy should revisit the ethical norms developed by the left-liberal tradition, as articulated by the late John Rawls and others. The article concludes that the information age offers a new opportunity to engineer a just social order, or, at any rate, that the policymaking community needs to reevaluate the idea of social engineering.  相似文献   
10.
A pipelined architecture for distributed text query evaluation   总被引:1,自引:0,他引:1  
Two principal query-evaluation methodologies have been described for cluster-based implementation of distributed information retrieval systems: document partitioning and term partitioning. In a document-partitioned system, each of the processors hosts a subset of the documents in the collection, and executes every query against its local sub-collection. In a term-partitioned system, each of the processors hosts a subset of the inverted lists that make up the index of the collection, and serves them to a central machine as they are required for query evaluation. In this paper we introduce a pipelined query-evaluation methodology, based on a term-partitioned index, in which partially evaluated queries are passed amongst the set of processors that host the query terms. This arrangement retains the disk read benefits of term partitioning, but more effectively shares the computational load. We compare the three methodologies experimentally, and show that term distribution is inefficient and scales poorly. The new pipelined approach offers efficient memory utilization and efficient use of disk accesses, but suffers from problems with load balancing between nodes. Until these problems are resolved, document partitioning remains the preferred method. Alistair Moffat was supported by the Australian Research Council, the ARC Special Research Center for Perceptive and Intelligent Machines in Complex Environments, and the NICTA Victoria Laboratory. William Webber and Justin Zobel were supported by the Australian Research Council. Ricardo Baeza-Yates was supported by Grant P01-029-F from Millennium Initiative of Mideplan, Chile; and by the University of Melbourne as a visiting scholar at the time this project was undertaken.  相似文献   
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