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The accuracy assessment in areal interpolation:An empirical investigation

Science China(Technological Sciences) 2008年第S1期51卷 62-71页

作者： LIU XiaoHang1 & LIU Yu2 1 Department of Geography & Human Environmental Studies,San fra.cisco State University,San fran-cisco,ca 94132,USA 2 Institute of Remote Sensing and Geographical Information Systems,Peking University,Beijing 100871,China Department of Geography & Human Environmental Studies San Francisco State University Institute of Remote Sensing and Geographical Information Systems Peking University

Areal interpolation is the process of transferring data from source zones to target zones. While method development remains a top research priority in areal interpo-lation,the accuracy assessment aspect also begs for attention. This paper reports an empirical experience on probing an areal interpolation method to highlight the power and potential pitfalls in accuracy assessment. A kriging-based interpolation algorithm is evaluated by several approaches. It is found that accuracy assessment is a powerful tool to understand an interpolation method,e.g. the utility of ancillary data and semi-variogram modeling in kriging in our case study. However,different assessment methods and spatial units on which assessment is conducted can lead to rather different results. The typical practice to assess accuracy at the source zone level may overestimate interpolation accuracy. Assessment at the target zone level is suggested as a supplement.

关键词： areal interpolation accuracy assessment area-to-point kriging

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Enabling Flexible Packet Filtering Through Dynamic Code Generation

Enabling Flexible Packet Filtering Through Dynamic Code Gene...

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2008 IEEE International Conference on Communications(ICC 2008)

作者： o.Morandi F.Risso M.Baldi A.Baldini Dipartimento di Automatica e Informatica Politecnico di Torino Torino Italy cisco Systems San Jose CAUSA

Despite its efficiency, the general approach of hardcoding protocol format descriptions in packet processing applications suffers from many limitations. Among the others, the lack of flexibility when needing to extend the software for supporting new protocols, and the proliferation of modules with similar functionality between different applications, resulting in decreased maintainability. The NetPDL language was defined for overcoming such limitations, allowing decoupling applications from the knowledge of the format of protocol headers. The main criticism to NetPDL relates to its supposed performance penalties;this paper demonstrates that this language can be effectively used for the dynamic generation of optimized, i.e. efficient and fast, packet-processing code, and presents the architecture of a compiler implemented for such purpose.

关键词： Filtering Protocols Application software Software maintenance optimizing compilers Program processors Databases Communications Society USA Councils Velocity measurement

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