Unique-order interpolative coding for fast querying and space-efficient indexing in information retrieval systems     

Cher-Sheng Cheng  Jean Jyh-Jiun Shann  Chung-Ping Chung 《Information processing & management》2006

This paper presents a size reduction method for the inverted file, the most suitable indexing structure for an information retrieval system (IRS). We notice that in an inverted file the document identifiers for a given word are usually clustered. While this clustering property can be used in reducing the size of the inverted file, good compression as well as fast decompression must both be available. In this paper, we present a method that can facilitate coding and decoding processes for interpolative coding using recursion elimination and loop unwinding. We call this method the unique-order interpolative coding. It can calculate the lower and upper bounds of every document identifier for a binary code without using a recursive process, hence the decompression time can be greatly reduced. Moreover, it also can exploit document identifier clustering to compress the inverted file efficiently. Compared with the other well-known compression methods, our method provides fast decoding speed and excellent compression. This method can also be used to support a self-indexing strategy. Therefore our research work in this paper provides a feasible way to build a fast and space-economical IRS.  相似文献   

Critical factors influencing secondary school pupil’s decisions to study computing in tertiary education: Gender differences     

Evrikleia?Tsagala  Maria?KordakiEmail author 《Education and Information Technologies》2007,12(4):281-295

This paper aims to determine the factors affecting the decisions of both male and female secondary school pupils whether or not to pursue undergraduate studies in Computing. It is based on research conducted in Greece, on a sample of 248 pupils, 135 of whom were female. All were aged 17 and about to decide on their future undergraduate studies. Questionnaires were used, addressing issues in the following four main categories: a) the reasons pupils chose/rejected Computing, b) how family and friends, the media and the school environment contribute to their decision, c) how pupils perceived their future after studying Computing and d) how pupils perceived the profile of a computer professional in terms of gender.

Maria KordakiEmail:

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The efficacy of ASL/ENGLISH bilingual education: considering public schools     

DeLana M  Gentry MA  Andrews J 《American annals of the deaf》2007,152(1):73-87

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Getting sloshed in outer space     

N.?AnanthkrishnanEmail author 《Resonance》2007,12(12):40-45

We document some basic facts about how liquids behave in the low gravity of outer space and how this poses challenges to space scientists and engineers who need to design and test systems that handle fluids in outer space while working in the 1-g environment on Earth. N Ananthkrishnan is Director, Coral Digital Technologies (P) Ltd, a Bangalore-based company working in the area of multidisciplinary simulation and system integration of aerospace, naval and surface vehicles, and in the design and development of autonomous unmanned/micro air vehicles.  相似文献   

日本国家级教育政策研究机构的改革与职能定位——基于日本国立教育政策研究所的分析     

王晓燕 《教育研究》2011,(7)

日本的国家级教育政策研究机构包括国家级政府主导的公务机关性质的教育政策研究机构、独立行政法人性质的教育政策研究机构和大学或大学附属性质的教育政策研究机构。为了更有助于国家层面教育政策的整体规划和深度推进,日本文部科学省对原有的国家级教育政策研究机构进行了改革重组,强化了其服务于政府宏观教育决策的职能。以代表日本国家级教育政策研究机构的国立教育政策研究所为例,改革后其职能为:准确恰当并且迅速地应对教育行政上的诸多课题;回应教育基层实践的要求,进行全面综合地调查研究;向教育相关者提供教育研究情报信息;开展教育领域的国际性的共同研究;推进与地方政府的教育研究所或研究中心等的共同研究。日本国家级教育政策研究机构的改革与发展,为我国教育政策研究的科学化发展提供了参考和启示。  相似文献   

公共教育服务体制创新:治理的视角     

蒲蕊 《教育研究》2011,(7)

为了满足多元化的公共教育需求,解决公共教育产品短缺和公共教育服务不到位等问题,有必要从治理的视角重新思考政府在公共教育产品与服务中的角色和作用,运用治理的理念和精神变革公共教育服务体制,实现公共教育服务供给主体的多元化、公共教育治理权力的多中心化和公共教育服务结构的多样化。  相似文献   

情感:情境教育理论构建的命脉     

李吉林 《教育研究》2011,(7)

儿童时期是一个人一生奠基的关键时期。30年来,我不懈地追求儿童发展的规律,初步构建了以儿童为主体的、自成体系的情境教育理论框架。情感,让我迈出情境教育的第一步。在此基础上,我提出了情感活动与认知活动结合起来的教育主张,构建了情感与认知结合获得教学高效能的课程范式。在回顾整理情境教学的探索历程中,我概括出情境教学促进儿童发展的五要素,构建了情境教育的基础模式和基础原理,并对情境课程进行了网络构建。回顾情境教育理论构架的历程,我的爱与儿童的情的交融,构成了情境教育理论构架的内核。情是教育的魂,是情境教育的命脉。  相似文献   

教师教育重心后移:动因与走向     

孟旭  樊香兰 《教育研究》2011,(7)

教师教育由职前为重向职后为重转移成为一种新趋势。在实践转向的新潮流中逐步形成了教师教育新中心。教师本位的确立是教师教育实践化转向的内在要求,以课为本的研修是教师专业发展的立基点,遵循教育实践的内在逻辑是教师教育改革生命力的保证,找回教育情景是教师教育实践化的具体体现。  相似文献   

Third-Party Sociomoral Evaluations in Children With Autism Spectrum Disorder     

Tianbi Li  Jean Decety  Xiaoyi Hu  Jiao Li  Jinling Lin  Li Yi 《Child development》2019,90(5):e584-e597

We examined explicit and implicit processes in response to third-party moral transgressions in children with autism spectrum disorder (ASD). Twenty 4- to 7-year-old children with ASD and 19 typically developing controls evaluated dynamic visual stimuli depicting intentional or accidental harm to persons or damage to objects. Moral evaluations, eye fixations, and pupil dilations toward the stimuli were collected. Results indicate a preserved capacity to understand the mental states of perpetrators and an implicit moral sensitivity to the third-party harms in children with ASD. Nonetheless, children with ASD showed specific sensitivity and emotional arousal when viewing damage to objects. These findings contribute to the understanding of the underlying mechanisms of moral reasoning in ASD and its possible association with the autistic symptoms.  相似文献   

The relationship between perceived ageism and depressive symptoms in later life: Understanding the mediating effects of self-perception of aging and purpose in life,using structural equation modeling     

Hyejin Kim  Bruce A. Thyer  Jean C. Munn 《Educational gerontology》2019,45(2):105-119

The purpose of this study is to examine the relationship between perceived ageism and depression in later life and to clarify the mechanism underlying this relationship by examining the mediating effects of self-perception of aging and purpose in life. The Health and Retirement Study surveys were used for this secondary analysis of data. The sample included 3,991 older adults, and structural equation modeling (SEM) analyses using structural regression models were conducted. SEM analyses revealed that full mediation effects of self-perception of aging and purpose in life exist. Older adults who perceive ageism are likely to have negative self-perception of aging, and this negative view of their own aging is likely to decrease purpose in life and increase depressive symptoms. The results of this study imply that more efforts and resources are necessary to reduce ageism and its negative effect on depression among older adults. Additionally, the current study suggests the necessity of anti-ageism policies and social services. Increasing positive self-perception of aging, purpose in life, and resilience could be the key to a better quality of life for older adults.  相似文献