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 We only diversify the search result when a query is informational.  To identify whether a query is informational or navigational, we leverage C4.5 algorithm to learn a decision tree.  The features used in this algorithm are as follows: nCS(q)=(Sessions of q that involves less than n clicks) / (session of q) nRS(q)=(Session of q that involves clicks only(More)
Graphene is a promising candidate in analog electronics with projected operation frequency well into the terahertz range. In contrast to the intrinsic cutoff frequency (fT) of 427 GHz, the maximum oscillation frequency (fmax) of graphene device still remains at low level, which severely limits its application in radio frequency amplifiers. Here, we develop(More)
Owing to the scattering and trapping effects, the interfaces of dielectric/graphene or substrate/graphene can tailor the performance of field-effect transistor (FET). In this letter, the polymer of benzocyclobutene (BCB) was used as an amphibious buffer layer and located at between the layers of substrate and graphene and between the layers of dielectric(More)
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