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Prasad Joshi G.,Yeungnam University | Nam S.Y.,Yeungnam University | Kim S.W.,Yeungnam University | Kim B.-S.,Hongik UniversityChungcheongnam do
Journal of Sensors | Year: 2016

Many existing medium access control protocols for cognitive radio wireless sensor networks waste bandwidth and suffer from delay because of the fixed channel negotiation period in the common control channel. In this paper, we propose a medium access control protocol for cognitive radio wireless sensor networks that adjusts the channel negotiation period based on network density. We simulate the proposed approach and compare it to the performance of the fixed channel negotiation period based approaches. The results show that the proposed approach efficiently utilizes white spaces and increases the aggregated goodput. Copyright © 2016 Gyanendra Prasad Joshi et al. Source


Lee N.E.,Hongik UniversityChungcheongnam do | Lee T.H.,Hongik UniversityChungcheongnam do | Seo D.H.,Hongik UniversityChungcheongnam do | Kim S.Y.,Hongik UniversityChungcheongnam do
International Journal of Bio-Science and Bio-Technology | Year: 2015

Water intake is important for health as it helps build the resilience of respiratory organs, especially among elderly people. However, elderly individuals are unaware of appropriate ways to consume water including adequate intake, timings, frequency, etc. This study attempted to identify the potential for consuming water, existing problems, types of consumers, and water intake behavior fornewseniors. Survey and in-depth interview data were collected, and a “persona” was used to understand new seniors’ goal and needs. The results showed that they struggled to adhere to habitual water consumption. Further, a smart water bottle that guides users to consistently drink appropriate amounts of water was addressed by applying the Internet of Things (IoT) technology to health care services. © 2015 SERSC. Source

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