Unofficial stories in the classroom     

Alistair Summers 《English in Education》1991,25(2):24-30

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Inverted Index Compression Using Word-Aligned Binary Codes   总被引：3，自引：1，他引：3  

Vo Ngoc Anh  Alistair Moffat 《Information Retrieval》2005,8(1):151-166

We examine index representation techniques for document-based inverted files, and present a mechanism for compressing them using word-aligned binary codes. The new approach allows extremely fast decoding of inverted lists during query processing, while providing compression rates better than other high-throughput representations. Results are given for several large text collections in support of these claims, both for compression effectiveness and query efficiency.  相似文献   

A pipelined architecture for distributed text query evaluation   总被引：1，自引：0，他引：1  

Alistair Moffat  William Webber  Justin Zobel  Ricardo Baeza-Yates 《Information Retrieval》2007,10(3):205-231

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   

Scottish Archive of Print and Publishing History Records     

David Finkelstein  Sarah Bromage  Alistair McCleery 《Learned Publishing》2002,15(3):193-197

‘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   

School Governors: An LEA Perspective     

Alistair Lawton 《School Leadership & Management》2013,33(2):171-174

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   

Whose place,whose history? Outdoor environmental education pedagogy as ‘reading’ the landscape     

Alistair Stewart 《Journal of Adventure Education & Outdoor Learning》2013,13(2):79-98

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   

Efficient distributed selective search     

Yubin Kim  Jamie Callan  J. Shane Culpepper  Alistair Moffat 《Information Retrieval》2017,20(3):221-252

Simulation and analysis have shown that selective search can reduce the cost of large-scale distributed information retrieval. By partitioning the collection into small topical shards, and then using a resource ranking algorithm to choose a subset of shards to search for each query, fewer postings are evaluated. In this paper we extend the study of selective search into new areas using a fine-grained simulation, examining the difference in efficiency when term-based and sample-based resource selection algorithms are used; measuring the effect of two policies for assigning index shards to machines; and exploring the benefits of index-spreading and mirroring as the number of deployed machines is varied. Results obtained for two large datasets and four large query logs confirm that selective search is significantly more efficient than conventional distributed search architectures and can handle higher query rates. Furthermore, we demonstrate that selective search can be tuned to avoid bottlenecks, and thus maximize usage of the underlying computer hardware.  相似文献   

Social Engineering in the Information Age     

Alistair S. Duff 《The Information Society》2005,21(1):67-71

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   

Measuring styles of learning and motivation     

Noel Entwistle  Béla Kozéki  Alistair Pollitt 《European Journal of Psychology of Education - EJPE》1987,2(2):183-203

The theoretical basis, the development and the use of an inventory designed to measure styles of learning and motivation are described. On the basis of previous research, items within the inventory were located on 20 sub-scales. The ten motivation sub-scales were derived from a theory of school motivation which was based on extensive interview and inventory work carried out in Hungary with children, their parents and teachers. The ten scales describing styles of learning were derived from concepts describing learning approaches and styles which emerged from interviews and experimental research with students in British and Swedish higher education. Versions were prepared in both English and Hungarian and given to samples of 614 British and 579 Hungarian pupils aged between 13 and 17 years. A remarkably similar factor structure was obtained in each sample. An analysis of mean scores indicated distinctive differences both between boys and girls, and between British and Hungarian pupils. Cluster analysis was used to investigate the possible existence of styles which combined both approaches to learning and aspects of school motivation. The potentiality of the inventory for use in conjunction with study skills courses is discussed.  相似文献   

Application of ICT and rubrics to the assessment process where professional judgement is involved: the features of an e‐marking tool     

Alistair Campbell 《Assessment & Evaluation in Higher Education》2005,30(5):529-537

This paper describes a new ICT assessment tool that reduces multi‐handling of marks, comments and scores specifically where professional judgement is involved. Whereas previous ICT applications in most fields of education have focused on student learning, this tool focuses on the lecturer task of the assessment process. Unlike many ICT based assessment tools, it enables the assessor to make and record professional judgements. This tool moves the marking/recording sheet off the desk and onto the desktop (computer screen). The aim in using the tool is to reduce the unproductive busy work of marking such as adding up of marks, recording, and spell checking of comments by hand, also it allow for many different views of the information, and to increase the time spent on feedback, reflection and moderation. The tool combines features of the word processor, spreadsheet and database applications, and paper‐based marking. These features are described and discussed as working examples are presented. The paper also describes other features or possible uses of the tool, including the development and refinement of rubric‐based scales; the recording of feedback by markers about the quality of the marking key during and after marking; the ability to compare one’s marks with those of the coordinator electronically; the evaluating and analysing of results; and the printing out of many different views of the data.  相似文献