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基于空间基坐标的尺寸可标注性判别研究 被引量:4
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作者 张树有 彭群生 谭建荣 《计算机学报》 EI CSCD 北大核心 2000年第9期982-986,共5页
尺寸信息的检验一直是 CAD/ CAM中有待解决的问题 .该文引入了空间基坐标的概念 ,基于空间基坐标具有与视图数无关的特性 ,提出了将多视图各投影点统一转换到空间基坐标 .通过对图素端点几何特征理解 ,建立了空间基坐标面间尺寸标注性... 尺寸信息的检验一直是 CAD/ CAM中有待解决的问题 .该文引入了空间基坐标的概念 ,基于空间基坐标具有与视图数无关的特性 ,提出了将多视图各投影点统一转换到空间基坐标 .通过对图素端点几何特征理解 ,建立了空间基坐标面间尺寸标注性统一的运算法则 ,从几何层讨论了尺寸的标注性 .尺寸与空间基坐标面进行映射 ,而与视图数无关 ,这样克服了尺寸三维约束与二维图形在维数上的不一致性 . 展开更多
关键词 计算机辅助设计 机械制图 尺寸可标性 CAD CAM
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Housing Policy in Khartoum: Plot Subdivision for Increased Housing Supply for Low-income People
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作者 Abdulhafeez Awad Hafazalla 《Journal of Civil Engineering and Architecture》 2018年第5期344-354,共11页
The article discusses plot size standards applied in the government sites-and-services projects in Khartoum and probes into the possible alternative ways of re-establishing solid grounds for those standards. The parti... The article discusses plot size standards applied in the government sites-and-services projects in Khartoum and probes into the possible alternative ways of re-establishing solid grounds for those standards. The particular issue of plot size is a crucial factor in the whole housing policy as it directly affects the urban land use and consumption and extends its influence far into sustainability and affordability issues and the whole housing policy and supply process. The article, analysing the applied standards, argues that plot subdivision can substantially contribute to providing more access of housing to the low-income groups. Large plot sizes can be subdivided driven by the need to realize security of tenure, doubling the owner-occupier housing stock which is the base issue of self-help housing, increases housing finance, provides variety of housing choices and behind all it conforms to the legacy principles and some cultural attributes of the local community. The article underlined existence of a cumbersome regulatory system, subdivision procedures and development controls which need to be reformed. 展开更多
关键词 Housing policy urban land Khartoum plot size regulatory framework.
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