期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
基于知识的飞机钣金零件工艺性评估方法 被引量:4
1
作者 王俊彪 李建新 刘闯 《计算机集成制造系统》 EI CSCD 北大核心 2008年第6期1090-1094,1100,共6页
在把工艺性分解为可成形性、可加工性、易加工性三项内容的基础上,建立了工艺性评估指标。采用知识的系统化建模方法,构建了飞机钣金零件工艺性评估知识模型,采用数据库方式和程序方式,分别表示出工艺性评估描述性知识和过程性知识,分... 在把工艺性分解为可成形性、可加工性、易加工性三项内容的基础上,建立了工艺性评估指标。采用知识的系统化建模方法,构建了飞机钣金零件工艺性评估知识模型,采用数据库方式和程序方式,分别表示出工艺性评估描述性知识和过程性知识,分析了问题定义→知识搜索匹配→修改方案编码匹配→回馈的推理过程。在此基础上,设计了基于知识的评估流程,包括零件信息输入、评估计算,以及不符合工艺性要求零件修改方案的给出。设计了基于Web的飞机钣金零件工艺性评估系统结构,采用Struts框架开发了系统。最后,以某型机四肋前段工艺性评估为例,验证了上述方法的有效性和实用性。 展开更多
关键词 钣金制造 工艺性评估 评估指标 评估知识模型 飞机钣金零件
下载PDF
Spatial Disparity and Efficiency of Science and Technology Resources in China 被引量:2
2
作者 WANG Bei LIU Weidong +1 位作者 LU Dadao ZHANG Jianbo 《Chinese Geographical Science》 SCIE CSCD 2012年第6期730-741,共12页
In the knowledge economy era,science and technology(S&T) resources are getting more and more important in shaping regional competiveness and building regional innovation capacity.As such,the spatial distribution o... In the knowledge economy era,science and technology(S&T) resources are getting more and more important in shaping regional competiveness and building regional innovation capacity.As such,the spatial distribution of S&T resources is a key to understanding regional development and disparities.By designing an input-output indicator system,this paper develops an evaluation model to examine the spatial distribution of S&T resources in China and assess their spatial efficiency.Moreover,the paper tries to explain spatial differences in the efficiency of S&T resources in China.Major findings are:1) the input and output of S&T resources in China shows a clear T-shaped spatial structure,i.e.,concentrated mainly in the coastal region and along the Changjiang(Yangtze) River;2) the efficiency of S&T resources in China displays strong spatial disparities,with the level of efficiency descending from the east to the west while high efficiency appearing in only several clusters;3) the utilization rates of S&T resources in most provinces are quite low,resulting in low efficiency of S&T resources allocation.The paper suggests that the utilization rate of S&T resources should be raised and the commercialization of S&T outputs should be enhanced to improve the efficiency of S&T resources in China. 展开更多
关键词 science and technology resources resources spatial allocation resources-utilization efficiency China
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部