“增城规划在线”建设研究

基于有关网站建设的理论,从发展定位、设计和运维管理三方面探讨了＂增城规划在线＂网站建设和管理的经验。认为建设一个城乡规划部门网站需要具有明确的发展定位,注重理论应用与实际的相结合,在制度上保障网站的运维管理,并根据社会需求与部门服务供给能力不断丰富和完善网站的内容,同时要将网站建设纳入持续的规划发展中。     

Towards intelligent geospatial data discovery: a machine learning framework for search ranking

Current search engines in most geospatial data portals tend to induce users to focus on one single-data characteristic dimension (e.g. popularity and release date). This approach largely fails to take account of users’ multidimensional preferences for geospatial data, and hence may likely result in a less than optimal user experience in discovering the most applicable dataset. This study reports a machine learning framework to address the ranking challenge, the fundamental obstacle in geospatial data discovery, by (1) identifying a number of ranking features of geospatial data to represent users’ multidimensional preferences by considering semantics, user behavior, spatial similarity, and static dataset metadata attributes; (2) applying a machine learning method to automatically learn a ranking function; and (3) proposing a system architecture to combine existing search-oriented open source software, semantic knowledge base, ranking feature extraction, and machine learning algorithm. Results show that the machine learning approach outperforms other methods, in terms of both precision at K and normalized discounted cumulative gain. As an early attempt of utilizing machine learning to improve the search ranking in the geospatial domain, we expect this work to set an example for further research and open the door towards intelligent geospatial data discovery.     

隧道洞口段位于滑坡体上的处治方法

隧道洞口段选址在滑坡体上的现象较为常见。以玉园隧道为工程实例,阐述了隧道洞口段滑坡地质灾害的成因及防治方法,通过数值计算针对性地提出该滑坡的应急处治措施。计算结果表明现有变形体为牵引式变形,卸载方案不利于其稳定,进而提出抗滑桩+降水、抗滑桩+旋喷桩2种方案,探讨2种处治方案的比较与选择,为类似的工程提供经验。     

门架式抗滑桩设计参数优化与桩体变形分析

近年来,因门架式抗滑桩具有较高的能效比,可以更为经济地实现有效加固,因而在大型滑坡地质灾害的治理中被广泛使用。门架式抗滑桩的设计参数选取是实际工程中的难点,因此本文采用数值模拟的方法对其设计参数的选取进行了优化研究。首先,对门架式抗滑桩的加固机理进行了阐述,详细分析了桩土的耦合作用。然后,基于加固后边坡稳定性的变化以及潜在滑移面的形态演变,对桩的设计参数进行了优化分析。在此基础上考虑到门架式抗滑桩的显著特点是在联系梁作用下桩体结构的受力协调,本文重点量化分析了分级堆载情况下门架式抗滑桩体结构的受力协调性,特别是利用荷载分担比来量化分析前后排桩的受力协调性,根据其在不同设计参数下的变化规律,得出桩体最佳桩间距和桩排距范围分别是3D~5D和3D~4D(D为桩径);最后,建立了最佳桩体设计参数条件下桩顶位移与堆载之间关系的指数函数方程。这一研究将为门式抗滑桩的设计与变形控制提供理论依据。     

隧道洞口滑坡稳定性分析与防治措施

受工程地质条件、水文地质条件及人为因素等的影响,公路隧道洞口施工过程中易发生洞口滑坡。综合连霍国道主干线宝鸡天水高速公路码头隧道洞口滑坡的形成特点、工程地质及水文地质特征,采用非线性有限元法对该洞口滑坡进行了分析,探讨了变形和塑性区分布特征,得到了滑面位置,提出了加固治理方案,为今后类似工程提供参考与借鉴。     

Comprehensiveness and Locality: Website Marketing of World City Governments in the Era of Globalisation

In the era of the Internet and globalisation, more and more international academics focus their attention on how city governments compete for talent, capital, and technology through website marketing to promote their economy and global status. However, 1) present research generally overlooks the importance of different types of elements in different marketing themes, 2) the combinations of marketing themes are still unknown, and 3) the presumption that the emphasised elements and specific combination of marketing themes on official websites differentiates cities requires more cases to be understood. In light of this background, this study collects homepage elements of 49 Alpha world cities' official websites and quantitatively analyses the frequency of different types of elements, the marketing content themes, and the dissimilarity of content of Chinese Alpha world cities. The results indicate that comprehensiveness and locality appear in the process of city marketing throughout official city websites. Overall, we make the following conclusions. 1) The importance of different kinds of elements significantly differs between 49 Alpha world cities. 2) Based on various combinations of elements, the marketing contents of Alpha world cities through official websites can be categorised into six themes of history and culture, government and information, construction and environment, government and living, construction and living, and general compound. 3) The marketing elements of five Chinese Alpha world cities, including Hong Kong, Beijing, Shanghai, Taipei and Guangzhou, are different than the other 44 Alpha world cities, and Chinese cities prefer to advertise their history and culture but rarely market citizens' activities. Moreover, Chinese cities' marketing mostly targets natives while the other 44 Alpha cities target external groups, and the locality of world cities' website marketing is reinforced especially on a native language edition website. This study ultimately finds that the Chinese edition websites of five Chinese cities place more focus on introducing local historical buildings, administrative services, and internal business information than the English edition websites do.     

地铁盾构管片姿态的水平偏差算法研究

针对管片姿态的水平偏差计算复杂、人工干预大等局限,提出一种基于设计参数的管片姿态水平偏差的自动计算方法。文中介绍地铁盾构管片姿态的测量方法,推导出直线段、圆曲线段以及缓和曲线段的姿态水平偏差的数学模型。通过工程实例,验证该方法数学模型的正确性,且能准确地、高效地反馈管片姿态水平偏差的信息。     

中澳留学网站信息流对留学人流导引作用机理

网站信息流对不同类型空间人流的导引作用研究是揭示"信息社会的地理学"特征的重要切入点之一。选择遥远国家间区域关系类型,以中国赴澳留学生在留学前、留学申请过程中及成行后对互联网的应用现状调查为基础,建立由不同类型中澳留学相关网站构成的"中澳间留学交流地理网络空间图式",并从网站使用者申请过程、网站平台组织和导引实现作用3个层面揭示中澳留学网站信息流对空间人流的导引机理。研究显示,大量中澳留学网站的建立虽在留学人流空间移动中不起决定作用,但起到了积极地促进作用。     

面向智能空间信息服务的网格GIS节点构建

针对网格空间信息智能服务系统的特点,将空间信息服务节点分为门户节点、管理节点、空间信息服务节点和功能服务节点四类,并对每类节点的构建进行了阐述,结合系统应用设计了一个试验环境,并进行了试验和总结。     

中国海洋大学数字化校园建设实践

在各高校网络基础设施建设初具规模的情况下,数字化校园建设是当前信息化建设的重要任务。文中以中国海洋大学数字化校园系统为例介绍了1个数字化校园系统,并分析其建设目标、总体应用框架、部署方案以及建设中存在的主要问题。