The principal component analysis implements the column-wise compression, using the correlation between attributes.

主成分分析使用属性之间的相关性实现按列压缩。

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Principal UUID: the UUID of the principal whose security attributes are described in PAC.

主体UUID：一个主体的UUID, PAC中描述了该主体的安全属性。

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These security attributes are the principal identity and the group information.

这些安全属性包括主体身份和组信息。

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Meike Escherich, principal analyst at Gartner, attributes the overall performance to economic uncertainty in the region, as well as lackluster demand in the wait for Windows 8 machines.

ENGADGET: Gartner reports Western Europe desktop shipments down, portable PCs up in Q2 2012