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基于分形理论的公路交通网络与区域经济发展关系的研究 被引量:34
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作者 沈惊宏 陆玉麒 兰小机 《地理科学》 CSCD 北大核心 2012年第6期658-665,共8页
以安徽省17个地级市公路交通网络为研究对象,用分形技术测算出各等级公路网络的分维数,并构建了度量综合路网的权维数模型。经过实证得出区域路网分维数受路网面积大小影响,继而对地级市进行了面积区划,把各类区的路网权维数、干线分维... 以安徽省17个地级市公路交通网络为研究对象,用分形技术测算出各等级公路网络的分维数,并构建了度量综合路网的权维数模型。经过实证得出区域路网分维数受路网面积大小影响,继而对地级市进行了面积区划,把各类区的路网权维数、干线分维数和综合经济指数做相关分析。研究发现各市的路网分维数与综合经济指数呈正相关,说明了路网覆盖度越均匀,交通网络越复杂地区经济发展越好。为进一步探求各市公路建设和经济发展之间的协调关系,通过引进公路规模与经济产出的分形模型测算出17个地级市的分维数,发现有合肥市等6城市经济发展超前于公路规模,铜陵等4城市基本一致,马鞍山等7城市经济发展滞后于公路建设规模。 展开更多
关键词 公路网络 权维数 综合经济指数 公路规模-经济发展关系模型
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On Weighted Tent Space
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作者 李兴民 《Chinese Quarterly Journal of Mathematics》 CSCD 1992年第2期78-83,共6页
In this paper, we introduce the A, weights into the tent space, many important results in the tent space are generalized. Also, new relations between the A, weights and Carleson measures are obtained.
关键词 tent space A weights Carleson measure
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Fransdimensional Bayesian inversion of timedomain airborne EM data 被引量:1
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作者 Gao Zong-Hui Yin Chang-Chun +3 位作者 Qi Yan-Fu Zhang BO Ren Xiu-Yan Lu Yong-Chao 《Applied Geophysics》 SCIE CSCD 2018年第2期318-331,365,共15页
To reduce the dependence of EM inversion on the choice of initial model and to obtain the global minimum, we apply transdimensional Bayesian inversion to time-domain airborne electromagnetic data. The transdimensional... To reduce the dependence of EM inversion on the choice of initial model and to obtain the global minimum, we apply transdimensional Bayesian inversion to time-domain airborne electromagnetic data. The transdimensional Bayesian inversion uses the Monte Carlo method to search the model space and yields models that simultaneously satisfy the acceptance probability and data fitting requirements. Finally, we obtain the probability distribution and uncertainty of the model parameters as well as the maximum probability. Because it is difficult to know the height of the transmitting source during flight, we consider a fixed and a variable flight height. Furthermore, we introduce weights into the prior probability density function of the resistivity and adjust the constraint strength in the inversion model by changing the weighing coefficients. This effectively solves the problem of unsatisfactory inversion results in the middle high-resistivity layer. We validate the proposed method by inverting synthetic data with 3% Gaussian noise and field survey data. 展开更多
关键词 Time-domain airborne EM Bayesian inversion WEIGHING DECONVOLUTION
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Government Management Innovation in the Age of Big Data
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作者 Que Tianshu 《Management Studies》 2016年第6期279-286,共8页
Both opportunities and challenges are currently faced by government management innovation in the age of "big data". Traditionally, relative studies view the management of governments as the effective means to improv... Both opportunities and challenges are currently faced by government management innovation in the age of "big data". Traditionally, relative studies view the management of governments as the effective means to improve governmental services, without really understanding the structural influence of big data and network technology on governmental mode of thinking. Against such backdrop, this paper tries to conduct critical analysis based upon traditional outcomes in this regard, trying to make full use of the function of big data technology. With these efforts, this paper contributes to the building of an interaction theory that could promote transparency of information and customization and segmentation of the policies. By constructing a mode in which management could be carried out based on the law of big data, by building an information management system in which balance could be achieved between responsibility and freedom, by promoting the rebalancing among public power, online civil society and civil rights, the innovation of governmental management would be achieved. 展开更多
关键词 big data government management data dictatorship INFORMATION network society public power
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