检索结果-内蒙古大学图书馆

RETRACTED: Accessibility analysis of distance education resources based on multiple constraint model (Retracted Article)

引用

INTERNATIONAL JOURNAL OF ELECTRICAL ENGINEERING EDUCATION 2021年第1-Sup期60卷 2890-2907页

作者： Yi, Dilan Shaoyang Univ Org Dept Communist Party Shaoyang 422000 Hunan Peoples R China

In recent years, more and more attention has been paid to the equity issues in education, Many Chinese families hope to change the fate of their children through educational equity. Based on the theory of accessibility, this paper analyzes the accessibility of distance education resources by using multi constraint model. The primary school education resources in the former Haishu District of Ningbo City are taken as examples to evaluate the accessibility to educational resources in all the primary schools in the district under the walking mode, the public transport mode, and the driving mode, respectively. The study shows that the areas with high accessibility to education resources in Haishu District are mainly distributed in places with developed road networks, large scale schools, and developed public transport networks, while those places with low accessibility are mainly located in the peripheral area. There are significant differences in the accessibility under different modes of transport, and the accessibility in the driving mode is superior to that in the public transport mode and the walking mode. In comparison, the correction effect on the accessibility in the public transport mode and the driving mode is average. Based on the multiple constraint model, the correction effect on the accessibility in the walking mode is significant. According to the analysis results, suggestions are put forward to promote the balanced development of educational resources in the Haishu District.

关键词： Accessibility to primary education resources multiple constraint model multi-mode transport

来源：评论

学校读者我要写书评

暂无评论

Query optimization-oriented lateral expansion method of distributed geological borehole database

引用

OPEN GEOSCIENCES 2023年第1期15卷

作者： Luo, Qingjia Jiangmen Polytech Sch Informat Engn Jiangmen 529090 Peoples R China

In order to reduce the resource occupancy and retrieval efficiency of geological drilling databases, this study proposes a distributed horizontal expansion method for query optimization of geological drilling databases by constructing a comprehensive geological data subtree, analyzing the characteristics of distributed databases and elements in geological databases, and quickly retrieving data resources based on element attributes. In addition, this study has designed a method to horizontally extend the database designed for drilling holes using a multi-constraint model in order to achieve extension optimization of the distributed geological drilling database. Experiments are conducted to verify the performance and applicability of the proposed method. The experiment shows that when the geological data capacity is 80 GB, the capacity level of the geological database can be extended to 41 x 105TB using the method proposed in this study. The retrieval efficiency is higher than 89% and the resource occupancy rate is lower than 12% after the horizontal expansion of the database. By using this research method, the horizontal expansion of the geological drilling database is more effective, and can effectively reduce the resource occupancy rate and retrieval efficiency of the geological drilling databases. This has value significance for geological drilling with efficiency improvement and development.

关键词： query optimization multiple constraint model geological data subtree distributed database

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：