Efficient online index maintenance for contiguous inverted lists     

Nicholas Lester  Justin Zobel  Hugh Williams 《Information processing & management》2006

Search engines and other text retrieval systems use high-performance inverted indexes to provide efficient text query evaluation. Algorithms for fast query evaluation and index construction are well-known, but relatively little has been published concerning update. In this paper, we experimentally evaluate the two main alternative strategies for index maintenance in the presence of insertions, with the constraint that inverted lists remain contiguous on disk for fast query evaluation. The in-place and re-merge strategies are benchmarked against the baseline of a complete re-build. Our experiments with large volumes of web data show that re-merge is the fastest approach if large buffers are available, but that even a simple implementation of in-place update is suitable when the rate of insertion is low or memory buffer size is limited. We also show that with careful design of aspects of implementation such as free-space management, in-place update can be improved by around an order of magnitude over a naïve implementation.  相似文献   

Innovation in PhD completion: the hardy shall succeed (and be happy!)   总被引：1，自引：0，他引：1  

Hugh Kearns  Maria Gardiner  Kelly Marshall 《高等教育研究与发展》2008,27(1):77-89

What is it that makes a PhD such a difficult process, and prevents candidates from completing on time? In this paper, we propose that self‐sabotaging behaviours, including overcommitting, procrastination and perfectionism, have a role to play. At Flinders University, we have developed a program in which we work with PhD students to help to reduce these behaviours and give them the strategies and attitudes they need to successfully (and happily!) complete their thesis. The program utilises cognitive–behavioural coaching, an evidence‐based strategy that we claim leads to significant and long‐term behavioural change. An evaluation of the program indicates that it is very successful, improving students’ ability to manage their time, set specific times for writing, and show work to their supervisor regularly, and that these behaviours were associated with lower levels of stress and improved ability to complete.  相似文献   

An online adaptive learning environment for critical‐thinking‐infused English literacy instruction     

Ya‐Ting Carolyn Yang  Jeffrey Hugh Gamble  Yu‐Wan Hung  Tzu‐Yun Lin 《British journal of educational technology : journal of the Council for Educational Technology》2014,45(4):723-747

Critical thinking (CT) and English literacy are two essential 21st century competencies that are a priority for teaching and learning in an increasingly digital learning environment. Taking advantage of innovations in educational technology, this study empirically investigates the effectiveness of CT‐infused adaptive English literacy instruction using a Moodle system. A one‐group pretest–posttest design was employed to evaluate the effect of the treatment on students' acquisition of CT skills (CTS) and English literacy. A total of 83 students enrolled in two sections of a general studies course at a large university in Taiwan participated in the semester‐long experiment. Adaptive learning was achieved through the use of an online Moodle system for (1) online grouping (based on pretest English literacy scores), (2) delivery of specifically designed adaptive learning materials for each group and (3) provision of individualised feedback. CT‐infused language activities based on social constructivist principles were designed for each level of adaptive instruction, whereas direct instruction for fostering CTS was provided in class and practiced or reflected upon in groups. Empirical results demonstrate that CT‐enhanced adaptive English literacy instruction simultaneously improved students' CTS and English literacy and that students' online discussions developed towards higher levels of interaction. This paper illustrates an effective blended learning model for adaptive instruction and offers recommendations for designing CT‐infused language learning activities that can successfully foster both CT and English literacy outcomes.  相似文献   

WHAT IS INTERIORITY AND WHY MIGHT IT BE IMPORTANT FOR HUMAN PERFORMANCE TECHNOLOGY?     

Hugh Leonard 《Performance Improvement》2014,53(3):22-30

Considerations of the inner world of workers and organizations might not fall within the provenance of human performance technology (HPT) practitioners. However, when it comes to being creative, workers need fertile imaginations driven from within. When it comes to productivity, mostly inner energies drive collaboration. When it comes to results, leaders must nurture workers toward wholeness for effective decisions and wisdom‐driven action. For these reasons, HPT practitioners need to know how to engage with the interiority factor.  相似文献   

种质资源保护中的问题与挑战          下载免费PDF全文

李德铢  杨湘云  Hugh W.Pritchard 《中国科学院院刊》2010,25(5):533-540

本文对植物迁地保护,特别是种质资源保护的研究背景、科学问题、行动计划和保护策略进行了评述,重点讨论了种子库在保护植物多样性中面临的挑战和重要科学问题,特别是种子活力、种子寿命和超低温保存等问题。大量的实例和数据表明,种子库作为植物多样性保护的重要手段之一,其在资金投入、保存时间和保存效率方面远远高于就地保护和其它的迁地保护方法。  相似文献   

Codes of Professional Museum Conduct     

Hugh H. Genoways  Mary Anne Andrei 《Curator: The Museum Journal》1997,40(2):86-92

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Recommended specifications for volatile mineral spirits for thinning paints     

Hugh L. Dryden 《Journal of The Franklin Institute》1920,190(5):727-728

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Museum Studies Programs Are Not Prepared for the Ph.D     

Hugh H. Genoways 《Curator: The Museum Journal》1996,39(1):6-11

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Purpose is Dead,Long Live Purpose!     

Desmond  Hugh 《Science & Education》2022,31(2):551-554

Science & Education -  相似文献