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（图1）
在VOSviewer面板中关于Normalization的选项（见图1）我不是很理解，看了Manual（见引用），但由于自身专业原因，看不太懂，有人能用通俗易懂的大白话解释一下选不同选项的差别以及各选项的适用条件吗？
Manual内容：
Normalization. Use the normalization method drop down list to determine how the strength of the links between items is normalized. Normalized link strengths are used as input for the vos layout technique and the vos clustering technique. The following options are available in the normalization method drop down list:
No normalization. If this option is selected, no normalization is performed We generally do not recommend this option
Association strength. If this option is selected, the association strength method is used for normalizing the strength of the links between items. Apart from a multiplicative constant, this method is identical to Eq.(6) in Van Eck and Waltman(2009). This option is selected by default.
Fractionalization. If this option is selected, the fractionalization method is used for normalizing the strength of the links between items. Apart from a multiplicative constant, this method is identical to Eq.(13)in Van Eck and Waltman(2009).
LinLog/modularity. If this option is selected, normalization is performed in the same way as in the LinLog layout technique and the modularity clustering technique. For more information about these techniques, we refer to Newman(2004)and Noack(2007, 2009).
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