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We present a proposal for helping students to cope with statistical word problems related to the classification of different cases of confidence intervals. The proposal promotes an environment where students can explicitly discuss the reasons underlying their classification of cases. 相似文献
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Adding Compression to Block Addressing Inverted Indexes 总被引:8,自引:1,他引:7
Gonzalo Navarro Edleno Silva de Moura Marden Neubert Nivio Ziviani Ricardo Baeza-Yates 《Information Retrieval》2000,3(1):49-77
Inverted index compression, block addressing and sequential search on compressed text are three techniques that have been separately developed for efficient, low-overhead text retrieval. Modern text compression techniques can reduce the text to less than 30% of its size and allow searching it directly and faster than the uncompressed text. Inverted index compression obtains significant reduction of its original size at the same processing speed. Block addressing makes the inverted lists point to text blocks instead of exact positions and pay the reduction in space with some sequential text scanning.In this work we combine the three ideas in a single scheme. We present a compressed inverted file that indexes compressed text and uses block addressing. We consider different techniques to compress the index and study their performance with respect to the block size. We compare the index against three separate techniques for varying block sizes, showing that our index is superior to each isolated approach. For instance, with just 4% of extra space overhead the index has to scan less than 12% of the text for exact searches and about 20% allowing one error in the matches. 相似文献
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ABSTRACTMuch research has focused on the introduction of information and communication technology (ICTs) into the lives of older people, but it has generally understood them as external factors who act as a sort of independent variable that impacts the seniors’ lives. There remains a dearth of empirical research into how aging and technology are co-constructed, namely, research that focuses on older people’s relationship to technology as a socio-technical network. We therefore contribute to this field by analyzing the development and establishment of a network in a geriatric hospital in Montevideo, Uruguay. Uruguay has been developing a one-tablet computer-per low-income-senior policy since 2015. In this research, we deployed a qualitative ethnographic research comprised of semi-structured interviews, jottings, and field notes where we explore the adoption of tablets within the corresponding actor-network. Our findings suggest that objectively, not only was the establishment of the sociotechnical network rife with complexities, disruptions, and fissures, but subjectively, seniors in the hospital were heavily influenced by their self-perception of the potentialities of ICTs. 相似文献
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This article focuses on education in Guinea-Bissau in the context of globalisations, examining the concept of globalisation and its relation to education and the curriculum. It focuses on the relatively neglected area of national education policies in Guinea-Bissau, comparing differences and common points of interference/influence of multilateral (international and regional) and bilateral organisations in these policies. Data collection was based on content analysis of a corpus of documents – the Education Act, the document of Portuguese Cooperation Programme, the Education Sector Policy Paper, the Education for All National Plan of Action, and Policy n. 3/2007/CM/UEMOA – and field notes collected from 2009 to 2012. The article argues that there is a tendency for the homogenisation of curriculum policies, at least at the macro-level, due to the different types of pressures coming from international/regional organisations. 相似文献
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Signal constellations in the hyperbolic plane are provided as an alternative to traditional signal constellations in the Euclidean plane, since channels may actually exist for which the latter signal constellations are not as suitable as the former. A hyperbolic gaussian probability density function, based solely on geometrical considerations, is derived to determine the performance of the hyperbolic signal constellations. Benefits result from an approach conceived in terms of reduced signal-to-noise ratio, needed to achieve a prescribed error rate and equivalent optimum receiver complexity. 相似文献