基于Oracle Spatial的空间查询技术及其优化     

熊雷 《教育技术导刊》2008,7(8):7-9

从Oracle Spatial的空间查询分析出发,结合实例分析了它的查询模型、空间算子以及常用的空间函数,最后给出了Oracle Spatial中空间查询的优化建议。  相似文献   

Affordances of narrative and numerical data: A social-semiotic approach to data use     

《Studies in Educational Evaluation》2021

Data use in education is a sensemaking process in which practitioners and researchers interact with different systems of meaning such as anecdotes or spreadsheets. The representational qualities of data and their influence on practice are critical but less well-discussed aspects of data use. Drawing on social semiotics, this theoretical article proposes that data should be discussed in terms of narrative and numerical modes of representation. Narrative data typically consist of protagonists and actions organized in a temporal structure, while numerical data typically consist of mathematical notations and visual representations such as graphs and figures. We argue that the representational properties of these two modes affect how data are interpreted and acted upon. We then present two contrasting cases from New Zealand and Norway of how affordances affect teachers’ data use processes. Finally, we discuss five challenges arising from our theorization about the affordances of data.  相似文献   

Capacity building to bridge data use and instructional improvement through evidence on student thinking     

《Studies in Educational Evaluation》2021

While schools and systems across the globe promote data-driven decision making, teachers often struggle to use data, especially from external assessments, to inform daily instruction. In this paper, we examine teacher capacity building for a less typical form of data use - evidence on student thinking. We draw on data from a longitudinal, in-depth qualitative study involving middle school math teachers who were engaged in an instructional improvement project. Findings show that data use occurred when evidence from student thinking was introduced as part of the instructional planning process. This shift was facilitated by an instructional coach whose capacity building efforts with teachers focused on coherence, specifically planning high quality instruction and using data effectively, while also meeting district pacing and unit planning goals. When teachers put new strategies into practice, feedback from formative assessment data allowed teachers to identify and address misconceptions in student thinking. Learning how to use data as part of instruction helped teachers build capacity to reflect on their own practice. Implications for theory, practice, and research are discussed.  相似文献   

应用型课程改革实践——以“数据结构”为例     

黄芳 《教育教学论坛》2021,(13):75-78

应用型课程是应用型高校转型的关键,是实现应用型人才培养的主渠道。“数据结构”是计算机专业的核心课程,在整个专业课程体系中处于承上启下的核心地位。通过分析目前“数据结构”课程教学中存在的问题,遵循“应用型课程建设七要素”,提出基于“工作过程系统化”的应用型本科院校“数据结构”课程体系教学改革,并从课程定位、课程设计、课程实施、课程考核与评价几个方面阐述了应用型教学改革实践。  相似文献   

基于投入与产出的质量管理有效性研究     

贺金凤  徐济超  杨剑锋  王海宇 《科学学与科学技术管理》2005,26(12):146-150

质量管理有效性的评价涉及多个输入输出指标的综合评价。在构建质量管理有效性评价指标体系的基础上,利用数据包络分析法对质量管理有效性进行了评价,并进一步用典型相关分析法对有效企业和无效企业的主要影响因子做了提取和分析,为企业正确决策提供信息支持。  相似文献   

对象关系数据仓库中的元数据管理     

彭丹 《科技广场》2007,(1):79-81

随着数据仓库(DW)和在线分析(OLAP)技术的发展,关系数据库的局限性越来越突出。而另一方面,对象关系数据库日益发展,促成了对象关系数据仓库的产生。本文主要介绍了建立在对象关系数据库基础上的数据仓库系统的元数据,并给出了一种新的元数据,用来实现从面向对象环境到关系环境的映射。  相似文献   

一种基于SOAP协议的XML数据传输的实现   总被引：1，自引：0，他引：1  

夏小云  喻金平 《科技广场》2005,(8):40-43

HTML作为一种简单易用的标记语言，极大的推动了Internet的发展.随着电子商务的发展，传统的数据交换技术已不能满足企业间大容量数据的交互.XML作为下一代Internet语言，简单易用并且具有极大的灵活性.SOAP是一种使用XML定义的在两个软件系统之间发送消息的简单协议，使用它可以在不同的应用程序之间方便地交换数据.本文描述了基于SOAP协议的XML数据网络传输的实现模型。  相似文献   

构建基于数据挖掘技术的客户关系管理系统     

俞鸣春  黄江燕  夏小云 《科技广场》2005,(12):51-53

随着企业对客户关系管理的愈加重视，数据挖掘技术已成为实现客户关系管理的重要手段。本文介绍了客户关系管理系统和数据挖掘相关技术，并结合保险业的特点。分析了数据挖掘技术在保险CRM中的应用案例，指出了其商业价值。  相似文献   

Automatic ranking of information retrieval systems using data fusion     

Rabia Nuray  Fazli Can 《Information processing & management》2006

Measuring effectiveness of information retrieval (IR) systems is essential for research and development and for monitoring search quality in dynamic environments. In this study, we employ new methods for automatic ranking of retrieval systems. In these methods, we merge the retrieval results of multiple systems using various data fusion algorithms, use the top-ranked documents in the merged result as the “(pseudo) relevant documents,” and employ these documents to evaluate and rank the systems. Experiments using Text REtrieval Conference (TREC) data provide statistically significant strong correlations with human-based assessments of the same systems. We hypothesize that the selection of systems that would return documents different from the majority could eliminate the ordinary systems from data fusion and provide better discrimination among the documents and systems. This could improve the effectiveness of automatic ranking. Based on this intuition, we introduce a new method for the selection of systems to be used for data fusion. For this purpose, we use the bias concept that measures the deviation of a system from the norm or majority and employ the systems with higher bias in the data fusion process. This approach provides even higher correlations with the human-based results. We demonstrate that our approach outperforms the previously proposed automatic ranking methods.  相似文献   

网络环境下的知识挖掘   总被引：9，自引：0，他引：9  

侯雅柟 《情报科学》2003,21(8):887-890

当前网络信息大爆炸，要从大量信息中获得所需知识就需要运用知识挖掘方法。本文首先对数据、信息、知识三个概念进行了区分，阐述了网络知识挖掘的概念及类型，并从数据仓库、语义网络和XML等底层信息加工组织方法上对网络知识挖掘进行探讨。  相似文献