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In this paper, an improved cooperative jamming (CJ) strategy is developed for physical layer (PHY) security in a multi-hop wireless communication system which employs beamforming in the last hop. Users are assigned to independent groups based on the merger-and-split rule in a coalition game. The secrecy capacity for a valid coalition is a non-convex optimization problem which cannot easily be solved...
In this study, we present a method for extracting and representing knowledge of presentation slide creators based on the slide contents that are published on a slide sharing service. The proposed method regards the number of views, downloads, and likes from other users as the users rating for a presentation slide, and extract knowledge of the slide creator in terms of the usefulness and knowledge...
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