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In this paper, we investigate the issues of QoS multicast routing in wireless ad hoc networks. Due to limited bandwidth of a wireless node, a QoS multicast call could often be blocked if there does not exist a single multicast tree that has the requested bandwidth, even though there is enough bandwidth in the system to support the call. In this paper, we(More)
Contemporary physical science studies rely on the effective analyses of geographically dispersed spatial data and simulations of physical phenomena. Single computers and generic high-end computing are not sufficient to process the data for complex physical science analysis and simulations, which can be successfully supported only through distributed(More)
To test the utilization of cloud computing for Geosciences applications, the GEOSS clearinghouse was deployed, maintained and tested on the Amazon Elastic Cloud Computing (EC2) platform. The GEOSS Clearinghouse is a web based Geographic Metadata Catalog System, which manages millions of the metadata of the spatially referenced resources for the Global Earth(More)
Public participation is very important for the success of an urban planning project, since any urban planning project will ultimately become part of the everyday life of the public. Most members of the general public are not urban planning professionals; therefore, well-designed visualization and interactive tools can help expand their participation in(More)
As one type of the attacks happening in MAC layer of distributed cognitive radio networks, a selfish behavior can degrade network performance significantly. In this paper, we analyze the characteristics of selfish behavior and the methods how to expose it. In order to improve the self-giving cooperation between the nodes in cognitive radio networks and(More)
With the development of Web services and service-oriented architecture (SOA), Web services has become the primary method to implement geospatial information sharing and interoperability, besides, geospatial information processing modeling basing on Web service compositions is one of the research hotspots. The data-centered procedure of geospatial(More)
For facilitating the analysis and representation of geology disaster, the three-dimensional dynamic simulation techniques of landslide disaster are presented in this paper. Combining with practical survey data, virtual geographic environments are reconstructed. Landslide disaster process and the generated impulse wave are simulated by three-dimensional(More)
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Airborne light detection and ranging (lidar) has become a powerful support for acquiring geospatial data in numerous geospatial applications and analyses. However, the process of extracting ground points accurately and effectively from raw point clouds remains a big challenge. This study presents an improved top-hat filter with a sloped brim to enhance the(More)