K. S. Kwak

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In this paper, we propose a scheme to save power during the execution of backoff algorithm by avoiding idle listening. Existing MAC protocols for sensor networks reduces energy consumption by introducing an active/sleep duty cycle. But they can't save energy during the execution of backoff algorithm. The propose scheme could further improve the energy(More)
Bereaved family members of cancer patient are at risk of having psychological problems such as anxiety and depression. However, prevalence and associated factors of anxiety and depressive symptoms among this population have not been explored in Korea.We conducted a nation-wide cross-sectional questionnaire survey of 3522 bereaved family members of cancer(More)
In this paper, we present the performance of different broadcast schemes for multihop sensor networks based on mathematical modeling. In near future many applications will demand multicast (Broadcast) communication feature from the sensor networks. This broadcast feature does not use virtual carrier sensing but relies on physical carrier sensing to reduce(More)
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