Rule5: The durability of a concept is the accumulation of the durability values of the links. If its current value is $d$ and the value of the incoming link is $d'$, the new value will be $u\times d' +(1-u)\times d$, a weighed average of the two, with the updating rate $u$ as a system parameter.
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It seems the durability of Links are not yet taken into account.
Technical Report
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It seems the durability of Links are not yet taken into account.