近年来,建成环境与体力活动关系的研究引起了广大学者的兴趣,尤其是在青少年体质研究方面取得了一系列的成果。当前,该领域的研究方法可分为定性研究与定量研究。随着地理信息系统(geographic information system,GIS)技术在众多领域...近年来,建成环境与体力活动关系的研究引起了广大学者的兴趣,尤其是在青少年体质研究方面取得了一系列的成果。当前,该领域的研究方法可分为定性研究与定量研究。随着地理信息系统(geographic information system,GIS)技术在众多领域的推广,应用GIS技术定量测量建成环境指标体系的方法也得到了有效的发展,是该领域定量研究的一种趋势。展开更多
A k-shortest path based algorithm considering layout density and signal integrity for good buffer candidatelocations is proposed in this paper. Theoretical results for computing the maximal distance betweenbuffers are...A k-shortest path based algorithm considering layout density and signal integrity for good buffer candidatelocations is proposed in this paper. Theoretical results for computing the maximal distance betweenbuffers are derived under the timing, noise and slew rate constraints. By modifying the traditional uniformwire segmenting strategy and considering the impact of tile size on density penalty function, this work proposesk-shortest path algorithm to find the buffer insertion candidate locations. The experiments show thatthe buffers inserted can significantly optimize the design density, alleviate signal degradation, save thenumber of buffers inserted and the overall run time.展开更多
文摘近年来,建成环境与体力活动关系的研究引起了广大学者的兴趣,尤其是在青少年体质研究方面取得了一系列的成果。当前,该领域的研究方法可分为定性研究与定量研究。随着地理信息系统(geographic information system,GIS)技术在众多领域的推广,应用GIS技术定量测量建成环境指标体系的方法也得到了有效的发展,是该领域定量研究的一种趋势。
基金Supported by the National Key Project of Scientific and Technical Supporting Programs (No. 2006BAK07B04).
文摘A k-shortest path based algorithm considering layout density and signal integrity for good buffer candidatelocations is proposed in this paper. Theoretical results for computing the maximal distance betweenbuffers are derived under the timing, noise and slew rate constraints. By modifying the traditional uniformwire segmenting strategy and considering the impact of tile size on density penalty function, this work proposesk-shortest path algorithm to find the buffer insertion candidate locations. The experiments show thatthe buffers inserted can significantly optimize the design density, alleviate signal degradation, save thenumber of buffers inserted and the overall run time.