网络环境信息标引的测评与比较研究   总被引：1，自引：1，他引：0  

刘竟  朱书梅  侯汉清 《中国图书馆学报》2008,34(1)

网络环境下,文献信息具有数量多、增长快、新词层出不穷等特点。标引是对信息资源进行组织的有效手段和重要环节,标引的质量和效率直接影响信息组织的质量和速度。对受控标引、自由标引和自动标引三种标引方式进行了相符度、专指度、标引深度及通用词数的测试对比.得出自由标引优于受控标引,自动标引优于自由标引及受控标引的结论。  相似文献   

DC词表的维护:实践、策略与模型   总被引：2，自引：1，他引：2  

托马斯·贝克  夏翠娟  刘炜 《图书馆杂志》2004,23(5):48-54,60

DCMI维护着一个包含众多元数据术语的词表，其中最主要的是包括15个元素的都柏林核心。然而，DCMI所关注和讨论的并不只是这个核心集，以及围绕这个核心集的实践、策略和模型，DC元数据模型已经由最初的单一模型进化成一个完整的框架，可以通过这个框架对应用DC元数据的各种实践进行评估。这些术语及其以前的版本现在都由统一资源标识符(URI)来标识，并建立了网页和形式化的schema文档，在注册系统中被编成索引，在具体的应用纲要(application profiles)中被引用。DCMI正在寻求一种简单易行的维护机制，一方面推荐使用不断变化和增长的核心标准，另一方面承认和重用其它的词表作为必要的补充，这两者之间需要建立一种平衡。  相似文献   

The Analysis of Chapter One of Pride and Prejudice——Via Material Processes and Relational Processes     

赵晶 《环球赛鸽科技》2015,(8)

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宣城市30万Nm／d液化天然气项目设计简介     

梅从保 《大众科技》2013,(8):30-31

文章简单介绍宣城市30万Nm／d液化天然气项目的设计，并对设计中难以把握或容易出错的地方做了重点说明。  相似文献   

Do karate fighters use situational probability information to improve decision-making performance during on-mat tasks?     

Nicolas Milazzo  Damian Farrow  Alexis Ruffault  Jean F. Fournier 《Journal of sports sciences》2016,34(16):1547-1556

This study examined the contribution of situational probability information to the perceptual and cognitive processes underlying decision-making behaviour during in situ Karate performance. Experts and novices were required to make decisions about various attacks in different fight scenarios. The order in which the fight situations were presented was modified in order to provide advanced probability information and identify whether fighters were able to use the latter information to make better decisions. Specifically, one of the attacks was repeated every four actions. Results revealed that experts were more accurate and faster than their less skilled counterparts to block and counterattack the opponent. The experts picked up the occurrence of the attack pattern after the fifth repetition whereas novices did not. This enabled experts to improve decision time and decision accuracy. Findings suggest that such superiority could stem from the perceptual and cognitive skills possessed by the experts, thus giving them the opportunity to recognise a situation more easily. This was reinforced by gaze behaviour which demonstrated that experts used a more efficient search strategy involving fewer fixations of longer duration on a lesser number of areas relative to the novices. Moreover, experts generated more refined karate-specific knowledge structures compared with the novices.  相似文献   

“I Heard it through the Grapevine”: Doctoral Student Socialization in Chemistry and History   总被引：2，自引：0，他引：2  

Susan K. Gardner 《Higher Education》2007,54(5):723-740

Twenty doctoral students in the disciplines of chemistry and history were interviewed to better understand the socialization processes that influence their success and how these processes differ by year in the degree program and disciplinary culture. Five major themes emerged describing these socialization processes and how they facilitate or impede degree success, including Ambiguity, describing the programmatic guidelines and expectations that surrounded much of the students’ experience; Balance, pointing to the students’ need to balance graduate school responsibilities along with external relationships and demands; Independence, describing the students’ desire to find equilibrium as they transitioned to the role of independent scholar; Development, highlighting the significant cognitive, personal, and professional development that occurs in these students’ graduate experience; and Support, describing the faculty, peer, and financial support needed for the students’ success in their degree programs. Suggestions for policy, practice, and further research are discussed.  相似文献   

Mathematical Modeling in the Primary School: Children's Construction of a Consumer Guide     

Lyn D. English 《Educational Studies in Mathematics》2006,63(3):303-323

This paper examines 6th grade children's local conceptual development and mathematization processes as they worked a comprehensive mathematical modeling problem (creating a consumer guide for deciding the best snack chip) over several class periods. The children and their teachers were participating in a 3-year longitudinal teaching experiment in which sequences of mathematical modeling problems were implemented from the 5th grade (10 years of age) though to the 7th grade. In contrast to traditional problem solving, mathematical modeling requires children to generate and develop their own mathematical ideas and processes, and to form systems of relationships that are generalizable and reusable. Reported here is a detailed analysis of the iterative cycles of development of one group of children as they worked the problem, followed by a summary of the mathematization processes displayed by all groups. Children's critical reflections on their models are also reported. The results show how children can independently develop constructs and processes through meaningful problem solving. Children's development included creating systems for operationally defining constructs; selecting, categorizing, and ranking factors; quantifying quantitative and qualitative data; and transforming quantities.  相似文献   

多指标随机过程弱对称0－1律     

黄建安 《湖南师范大学教育科学学报》1996,(2)

本文证明了多指标平稳随机过程的弱对称０－１律，推广了朱成熹在单指标情形下的有关结果  相似文献   

新信息技术新课程标准新语文变革     

解自忠 《中国教育技术装备》2003,(11):17-18

科学地阐述了新的信息技术的不断出现并得到运用，《语文新课程标准》的正式出台，引发了语文教学的新变革。  相似文献   

基于m-相依序列的学习机器相对一致收敛的界     

王华丽 《襄樊学院学报》2011,32(11):5-8

为了研究m-相依序列下学习机器的推广性能,把基于独立同分布的结果推广到m-相依序列,建立采用ERM算法的学习机器的经验风险到它的期望风险相对一致收敛速率的界.并对m-相依序列现有的结论进行改进,得到了m-相依序列下,采用经验风险最小化算法学习机器的推广性能的界.  相似文献