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This paper proposes a carrier-sensing multiple access protocol for asynchronous multiple-packet reception (MPR), which enables wireless receivers to correctly decode partially time-overlapping packets. Unlike previous studies, which require back-off nodes to constantly monitor the channel, our design requires only that each node sense the number of transmitting nodes after the completion of the back-off...
This paper takes the “Ya'an earthquake” incident as an example, makes an in-depth research on the microblog public opinion towards emergency events, and makes an early-warning analysis based on the corresponding public opinion life cycle. The paper also provides a reference for the Microblog public opinion response of emergency events.
In order to monitor the time varying heart rate (HR) of human in exercise effectively, a noncontact detection method based on video camera is realized in this paper. Based on the principle of Photoplethysmography (PPG), the camera records the regular changes of the skin surface in human face due to their blood volume pulse (BVP). After a series of preprocessing including facial recognition, band-pass...
Strabismus is a common ophthalmic disease with a relatively high prevalence (4%). It is one of the most common vision disorders in preschool children. If it is not timely diagnosed and well treated, strabismus would cause amblyopia, and even permanent vision loss. The diagnosis is thus essential. However, most of the diagnosis methods, such as cover testing, are conducted manually by an ophthalmologist...
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