��ظ�ԭ��Ե��Ӧ��ռ�ֲ���������

????“?й?????????????????”2009-2011??GPS?????????????????????????η???????????????????????????????????????????????????????????????顣??????????仯??????????????????????????????????????????????????????????????????????????????????????????????????????????????????Ms8.0?????????????????????????α?????????????????????????????????????     

基于开源方式的多源网络地名数据库整合

目前我国地名数据库的建设主要靠传统测绘手段完成,存在周期长、成本高、效率低的缺点。随着地理数据服务的发展,出现了一些在格式、尺度、范围、内容、现势性等方面具有差异性的免费地名数据库。本文提出了一种整合多开源网络地名数据库形成统一格式、多尺度、内容完备、现势性强的矢量地名库的方法。首先通过OGR和数据访问API构建不同文件格式的网络地名库的矢量格式转换模型,然后对多网络地名库进行矢量转换,最后对其进行数据预处理、数据处理、数据分类映射等处理过程建立矢量地名数据库。本文以香港地区的Geonames,GNS,OSM地名数据库整合为例,验证了方法的可行性。     

利用粒子群算法的小波神经网络探讨

小波神经网络(WNN)具有较强的逼近和容错能力,并具有良好的收敛性和鲁棒性。然而其网络收敛速度慢、搜索成功率低和易陷入局部极小值等缺点使得传统的小波神经网络难以得到广泛应用。本文介绍一种基于粒子群(PSO)算法的小波神经网络,其通过利用种群间信息共享进行寻优,以获得结构化的神经网络,克服了传统小波网络的诸多缺点,结合工程实例,检验了其具有较好的适用性和可靠性。     

How does network structure and complexity in river systems affect population abundance and persistence?

Models of habitat connectivity, and how network structure and connectivity affects resident populations, are increasingly being developed for terrestrial habitat networks. Rivers, unlike many terrestrial habitat networks, follow a rigid hierarchical branching structure to form dendritic networks. It has been hypothesised that this unique structure must have implications for population processes. We developed a theoretical model to relate local-scale habitat quality and connectivity to landscape-scale population dynamics of mobile organisms (e.g. fish, aquatic invertebrates). River networks were modelled as directed graphs, with nodes being habitat patches, and edges the connections between them. Using population simulation analyses, we investigated the effects of network structure on population abundance and persistence. Network structural complexity affected landscape-scale population abundance, but the apparent effect depended upon how structure was quantified. There were no noticeable effects of dendritic network structure on population persistence. Previous research on the effects of habitat network structure on population persistence has used metapopulation patch occupancy models, which do not directly consider population dynamics. Our results show that spatially-explicit population modelling is possible, and that it provides information beyond that possible with patch occupancy models (e.g. population abundance). More importantly, it calls into question whether metapopulation models provide an adequate representation of population dynamics in dendritic habitat networks.     

浅析青海地震信息网络优化改造

介绍了青海地震信息网络在原有网络基础上进行优化改造的情况,详细阐述了优化改造的具体内容,以及优化改造工作对青海省地震局网络产生的作用。     

基于BP神经网络的吉林省县域经济发展水平评价

选取6个经济指标,运用BP神经网络模型对吉林省39个县级城市的经济发展水平进行评价。结果表明：吉林省区域经济发展水平总体不高,经济发展水平地域差异显著。经济发展水平较高的县市在空间上表现为明显的空间集聚,长吉图地区县市的经济发展水平明显高于其他地区,而经济发展较差的县市主要集中在吉林省西部地区。     

Dynamic Variations of the Gravity Field before and after the M5. 1 Wen’an Earthquake in Hebei Province

In order to explore the abnormal variations before and after the Wen'an M5. 1 earthquake on July 4, 2006, the gravity data observed by the Wenba Gravity Observation Network before and after the earthquake was analyzed. The relationships between gravity change and vertical displacement and shallow groundwater level were discussed, and elevation correction of the gravity was preliminarily performed. The results show that there were abnormal gravity changes before the M5. 1 earthquake, which appeared as gravity rising in the whole observation network, especially in the south part. A high gradient of gravity variation appeared around the epicenter before the M5. 1 earthquake, especially during the short period between October 2005 to April 2006. The boundary of the positive and negative gravity variations gradually deflected and began to recover from October 2007.     

网络信息安全的模糊综合评判

通过分析网络信息安全的现状,提出了物理安全、逻辑安全和安全管理三个一级评判指标和26个二级评判指标,利用模糊综合评判方法对某单位局域网信息安全实例进行了评判,提出了一种基于圆形分布的隶属度分布函数,并进行了使用和验证。     

基于DLNA协议的多屏互动系统

由于移动设备的普及和移动互联网应用的推广,移动应用趋于多样化和复杂化,多设备间的数据传输及共享成为移动应用技术研究的重点。首先分析DLNA(Digital Living NetworkAlliance)协议的工作原理,然后描述利用DLNA协议在Android操作系统中对多屏互动系统的设计及关键模块的实现。该平台具有无缝连接的、所见即所得的、操作简单等优点。