In the past decade,the e-government affairs keep developing,which prom otes the reform of governmental affairs and the enhancement of administrative efficiency.However,the phenomenon of inform ation silo has bad influ...In the past decade,the e-government affairs keep developing,which prom otes the reform of governmental affairs and the enhancement of administrative efficiency.However,the phenomenon of inform ation silo has bad influence upon the governm ental information resources sharing and the efficiency of the e-government affairs,hindering inform ation connectivity,so that the government management cannot meet the need of society,nor can the e-governm ent develop in the long run.This paper attempts to analyze the embodiment and causes of the phenomenon of information silo,putting forward measures of solving the problem of inform ation silo.展开更多
【目的】存量发展背景下,城市公园等正式绿色空间增量困难、服务功能日益局限,而数量较多的非正式绿色空间尚未引起足够重视,未充分发挥价值。探究非正式绿色空间的独特价值与利用方式,可为用地约束下人居环境提升与绿化功能创新提供线...【目的】存量发展背景下,城市公园等正式绿色空间增量困难、服务功能日益局限,而数量较多的非正式绿色空间尚未引起足够重视,未充分发挥价值。探究非正式绿色空间的独特价值与利用方式,可为用地约束下人居环境提升与绿化功能创新提供线索。【方法】对Web of Science核心数据库登载的47篇典型文献进行了分析,从识别技术、游憩价值、生态价值和更新模式四方面,系统探知国外非正式绿色空间研究进展。【结果】非正式绿色空间具有触发多样游憩感知、满足多元使用需求、提升绿地获取公平性等游憩价值,以及丰富城市生物多样性、提升生态系统调节能力等生态价值。同时,国外实践表明,运用公共政策、政府支持、社会推动的综合策略可助力实现非正式绿色空间更新改造。【结论】结合国情并借鉴国外理论与实践,建议运用主动响应居民需求、创建地理信息数据库、创新规划管理范式三大策略优化国内城市非正式绿色空间建设,以期公平、生态、节约地推进城市绿化建设。展开更多
An orthogonal wavelet transform fractionally spaced blind equalization algorithm based on the optimization of genetic algorithm(WTFSE-GA) is proposed in viewof the lowconvergence rate,large steady-state mean square er...An orthogonal wavelet transform fractionally spaced blind equalization algorithm based on the optimization of genetic algorithm(WTFSE-GA) is proposed in viewof the lowconvergence rate,large steady-state mean square error and local convergence of traditional constant modulus blind equalization algorithm(CMA).The proposed algorithm can reduce the signal autocorrelation through the orthogonal wavelet transform of input signal of fractionally spaced blind equalizer,and decrease the possibility of CMA local convergence by using the global random search characteristics of genetic algorithm to optimize the equalizer weight vector.The proposed algorithm has the faster convergence rate and smaller mean square error compared with FSE and WT-FSE.The efficiency of the proposed algorithm is proved by computer simulation of underwater acoustic channels.展开更多
文摘In the past decade,the e-government affairs keep developing,which prom otes the reform of governmental affairs and the enhancement of administrative efficiency.However,the phenomenon of inform ation silo has bad influence upon the governm ental information resources sharing and the efficiency of the e-government affairs,hindering inform ation connectivity,so that the government management cannot meet the need of society,nor can the e-governm ent develop in the long run.This paper attempts to analyze the embodiment and causes of the phenomenon of information silo,putting forward measures of solving the problem of inform ation silo.
文摘【目的】存量发展背景下,城市公园等正式绿色空间增量困难、服务功能日益局限,而数量较多的非正式绿色空间尚未引起足够重视,未充分发挥价值。探究非正式绿色空间的独特价值与利用方式,可为用地约束下人居环境提升与绿化功能创新提供线索。【方法】对Web of Science核心数据库登载的47篇典型文献进行了分析,从识别技术、游憩价值、生态价值和更新模式四方面,系统探知国外非正式绿色空间研究进展。【结果】非正式绿色空间具有触发多样游憩感知、满足多元使用需求、提升绿地获取公平性等游憩价值,以及丰富城市生物多样性、提升生态系统调节能力等生态价值。同时,国外实践表明,运用公共政策、政府支持、社会推动的综合策略可助力实现非正式绿色空间更新改造。【结论】结合国情并借鉴国外理论与实践,建议运用主动响应居民需求、创建地理信息数据库、创新规划管理范式三大策略优化国内城市非正式绿色空间建设,以期公平、生态、节约地推进城市绿化建设。
基金Sponsored by the Nature Science Foundation of Jiangsu(BK2009410)
文摘An orthogonal wavelet transform fractionally spaced blind equalization algorithm based on the optimization of genetic algorithm(WTFSE-GA) is proposed in viewof the lowconvergence rate,large steady-state mean square error and local convergence of traditional constant modulus blind equalization algorithm(CMA).The proposed algorithm can reduce the signal autocorrelation through the orthogonal wavelet transform of input signal of fractionally spaced blind equalizer,and decrease the possibility of CMA local convergence by using the global random search characteristics of genetic algorithm to optimize the equalizer weight vector.The proposed algorithm has the faster convergence rate and smaller mean square error compared with FSE and WT-FSE.The efficiency of the proposed algorithm is proved by computer simulation of underwater acoustic channels.
