中国科学院机构知识库网格系统: 检索

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	Urban population densities and their policy implications in China SCI/SSCI论文 OAI收割 2008 Tan M. H.; Li X. B.; Lu C. H.; Luo W.; Kong X. B.; Ma S. H. 收藏 \| 浏览/下载：33/0 \| 提交时间：2012/06/08 China Urban population density Natural and socio-economic parameters Policy implication land-use change growth-management comparing states hong-kong indicators expansion landscape sprawl
	High speed, low memory image coding using zero blocks of wavelet coefficients (EI CONFERENCE) 会议论文 OAI收割 4th International Conference on Image and Graphics, ICIG 2007, August 22, 2007 - August 24, 2007, Chengdu, China 作者: Zhang T.; Yang W.-G. 收藏 \| 浏览/下载：45/0 \| 提交时间：2013/03/25 We propose a new high speed low memory SPECK image coder based on the form of block-unit states called LBUS-SPECK which uses the form of block-unit states and the form of block exponents to substitute LIS and LSP of SPECK. A form of block-unit states is introduced to store the significance flag of coefficients and the value of the block-unit exponents. A form of block exponents is introduced to store the block exponents which are used to represent the max coefficient in a decomposed block. A new block depth-finding strategy is developed for searching insignificant sets at sorting stage. Experimental results show that the obtained PSNR values for the decoded images are very close to those of SPECK algorithm and the memory consumption is reduced by 9 times the encoding timing is saved about 15%. Comparing with SPECK algorithm this algorithm not only has better performance of the decoded images but also is easy to implement especially it provides an efficient way for hardware implementation of wavelet embedded block coding. 2007 IEEE.
	Measuring urban sprawl in Beijing with geo-spatial indices SCI/SSCI论文 OAI收割 2007 作者: Zhang Q. 收藏 \| 浏览/下载：42/0 \| 提交时间：2012/06/08 urban sprawl measurement geo-spatial indices Beijing policy implications growth management comparing states indicators