摘要：
Extjs作为一个RIA(Rich Internet Applications)框架,在MVC模式的基础上提供了MVVM模式的支持.该文详细介绍了Extjs框架下的前端MVVM与MVC设计模式的工作原理以及它们各自优点与不足,并将实现MVVM设计模式的Ex-tjs框架引入到前端用户界面的开发中,通过在护理信息系统的用户界面设计中的成功实践后提出了使用MVVM模式在Extjs框架下的一种编程实践.
作者机构：
[Liu Z.Y.; Li Y.] School of Information Engineering, University of Science and Technology Beijing, Beijing, China;School of Computer Science and Technology, University of South-China, Hengyang, 421001, China;[Ouyang C.P.] School of Information Engineering, University of Science and Technology Beijing, Beijing, China, School of Computer Science and Technology, University of South-China, Hengyang, 421001, China
通讯机构：
[Liu, Z. Y.] S;School of Information Engineering, , Beijing, China
摘要：
Cloud computing provides a solution which enables large-scale data and web resources sharing. RDF technology resolves the problems of semantic heterogeneity in data integration. Therefore, the combination of Cloud Computing and RDF brings great challenges to traditional data integration. This paper presents a framework for materials web resources integration in the RDF-based cloud (CloudMat), which focus on large amounts of materials web resources, to address the requirement of sharing materials data and capturing materials knowledge in cloud. We also try to describe the key technologies of implementation of RDF storage based on Hadoop as well as RDF querying based on MapReduce in details. An RDF triple store method building on top of Hbase (column-store) is discussed, and it is considered to be more optimal than traditional row-store. In order to overcome the performance bottleneck in searching materials web data, we focus on how to realize the distributed SPARQL query on Hadoop.
作者机构：
[Ouyang, Chunping; Hu, Changjun; Liu, Zhenyu] Univ Sci & Technol Beijing, Sch Informat Engn, Beijing 100083, Peoples R China.;[Ouyang, Chunping] South China Univ, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
会议名称：
CISIS 2010, The Fourth International Conference on Complex, Intelligent and Software Intensive Systems, Krakow, Poland, 15-18 February 2010
关键词：
data grid;GIS;spatial metadata;gas network safety evaluation
摘要：
With the development of e-science, more and more attention is drawn to the visualization and interoperation of scientific data. Integrating Data Grid technology and Geographical Information System (GIS) offers a well solution to implement e-science applications. Utilizing Data Grid technology could take advantages to share heterogeneous and distributed data sources. GIS provides visualization environment for spatial data and non-spatial data. In this paper we brought forward spatial information grid (SIG) architecture for gas network safety evaluation application. After discussing the key technologies of gas network SIG, such as spatial metadata modeling and spatial metadata searching, one prototype system was designed and then implemented. Through the SIG system, gas network safety evaluation results can be shown to users in an intuitive and convenient way.
