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一种新型k匿名隐私保护算法 被引量:2
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作者 刘斐 樊华 +1 位作者 金松昌 贾焰 《信息网络安全》 2012年第8期199-202,共4页
文章针对公开数据集上的隐私数据保护展开研究,分析了经典的k匿名算法在处理连续发布的数据集时存在的不足,在新的应用场景下对其进行改进。文章提出的算法通过增量式的数据处理技术减少了时间开销,适用于大规模数据集的快速连续发布。... 文章针对公开数据集上的隐私数据保护展开研究,分析了经典的k匿名算法在处理连续发布的数据集时存在的不足,在新的应用场景下对其进行改进。文章提出的算法通过增量式的数据处理技术减少了时间开销,适用于大规模数据集的快速连续发布。算法通过为每个数据元组选择最优等价类,有效控制了信息损失。算法以敏感属性值泛化技术代替了伪造元组的引入,保证了数据集上只包含真实数据,提高了数据集的可用性。通过实例分析发现提出的算法可以很好的解决连续发布数据集上的隐私保护问题。 展开更多
关键词 k匿名算法 隐私保护 连续数据集 泛化技术
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Geophysical, Petrographic and Geochemical Survey on the Nazca Lines
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作者 Andreas Weller Silvia Rosas +1 位作者 Michael Eidner Kerstin Hartsch 《Journal of Earth Science and Engineering》 2013年第3期159-167,共9页
This paper reports some results of geoscientific investigations of the shallow subsurface beneath the Nazca geoglyphs in the stone desert in southern Peru. A resistivity and georadar survey was accompanied by soil sam... This paper reports some results of geoscientific investigations of the shallow subsurface beneath the Nazca geoglyphs in the stone desert in southern Peru. A resistivity and georadar survey was accompanied by soil sampling at a test site in the Palpa district. The resulting images of the two geophysical methods indicate similar structures. Georadar enables a fast and continuous data acquisition but is restricted in its depth of penetration. Despite the dry surface conditions, the electrical method yielded good results in the desert area. The resulting resistivity images for both vertical and horizontal slices provide structural information that might be interpreted in terms of lithology and water content. A promising correlation between sulfate content and electrical resistivity at shallow depth was observed that might be helpful to provide insight into the migration of chemical constituents. The approach to combine geophysical, mineralogical and geochemical methods proves to be successful to extend the knowledge on the weathering processes in the desert soil. 展开更多
关键词 Nazca geoglyphs resistivity imaging GEORADAR sulfate content.
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Mini-DDL and Its Applications in the Radiation Field Measurement around Accelerators 被引量:3
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作者 李珏忻 李裕熊 +2 位作者 许炳 吴璨 曾鸣 《Chinese Physics C》 SCIE CAS CSCD 北大核心 2008年第z1期151-153,共3页
The variation of the radiation field around accelerator is complex.Only by real-time monitoring can one learn them in detail.The traditional measurement methods have been out of date.The mini-DDL is a specific device ... The variation of the radiation field around accelerator is complex.Only by real-time monitoring can one learn them in detail.The traditional measurement methods have been out of date.The mini-DDL is a specific device designed for such radiation field real-time monitoring.It has huge flash memories and is small in size.It can communicate with the control PC via intranet or RS232 port.So it is suitable to be applied not only in area monitoring but also in temporary monitoring.The radiation field measurements results obtained using the Mini-DDL are introduced in this paper. 展开更多
关键词 radiation field around accelerator mini-DDL real-time monitoring
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